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mercury/compiler/parse_goal.m
Zoltan Somogyi 0aff352a12 Add a specific warning for "!V ^ fn = ...". 
compiler/parse_goal.m:
    As above.

tests/invalid/field_syntax_error.{m,err_exp}:
    Extend this test case with a test of the new warning.
    Document its old as well as its new parts.
2025-11-30 03:38:12 +11:00

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%---------------------------------------------------------------------------%
% vim: ft=mercury ts=4 sw=4 et
%---------------------------------------------------------------------------%
% Copyright (C) 1996-2011 The University of Melbourne.
% Copyright (C) 2016-2025 The Mercury team.
% This file may only be copied under the terms of the GNU General
% Public License - see the file COPYING in the Mercury distribution.
%---------------------------------------------------------------------------%
%
% File: parse_goal.m.
% Main authors: fjh, zs.
%
% This module defines the predicates that parse goals.
%
%---------------------------------------------------------------------------%
:- module parse_tree.parse_goal.
:- interface.
:- import_module parse_tree.error_spec.
:- import_module parse_tree.maybe_error.
:- import_module parse_tree.prog_data.
:- import_module parse_tree.prog_item.
:- import_module cord.
:- import_module list.
:- import_module term.
%---------------------------------------------------------------------------%
% Convert a single term into a goal.
%
:- pred parse_goal(term::in, cord(format_piece)::in,
maybe2(goal, list(warning_spec))::out,
prog_varset::in, prog_varset::out) is det.
% Convert a term, possibly starting with `some [Vars]', into a list
% of the quantified variables, a list of quantified state variables,
% and a goal. (If the term doesn't start with `some [Vars]', we return
% empty lists of variables.)
%
% Exported to superhomogeneous.m for parsing if-then-else expressions.
%
:- pred parse_some_vars_goal(term::in, cord(format_piece)::in,
maybe4(list(prog_var), list(prog_var), goal, list(warning_spec))::out,
prog_varset::in, prog_varset::out) is det.
%---------------------------------------------------------------------------%
%---------------------------------------------------------------------------%
:- implementation.
:- import_module libs.
:- import_module libs.options.
:- import_module mdbcomp.
:- import_module mdbcomp.sym_name.
:- import_module parse_tree.parse_goal_util.
:- import_module parse_tree.parse_sym_name.
:- import_module parse_tree.parse_tree_out_misc.
:- import_module parse_tree.parse_tree_out_term.
:- import_module parse_tree.parse_vars.
:- import_module assoc_list.
:- import_module bag.
:- import_module char.
:- import_module int.
:- import_module maybe.
:- import_module pair.
:- import_module require.
:- import_module solutions.
:- import_module string.
:- import_module term_context.
:- import_module unit.
:- import_module varset.
%---------------------------------------------------------------------------%
parse_goal(Term, ContextPieces, MaybeGoal, !VarSet) :-
% We could do some error-checking here, but all errors are picked up
% in either the type-checker or parser anyway.
%
% We just check if it matches the appropriate pattern for one of the
% builtins. If it doesn't match any of the builtins, then it's just
% a predicate call.
( if
% Check for builtins...
Term = term.functor(term.atom(Name), ArgTerms, Context),
string_goal_kind(Name, GoalKind)
then
parse_non_call_goal(GoalKind, ArgTerms, Context, ContextPieces,
MaybeGoal, !VarSet)
else
% It is not a builtin.
Context = get_term_context(Term),
term.coerce(Term, ProgTerm),
% Check for predicate calls.
( if try_parse_sym_name_and_args(ProgTerm, SymName, ArgTerms) then
Goal = call_expr(Context, SymName, ArgTerms, purity_pure)
else
% A call to a free variable, or to a number or string.
% Just translate it into a call to call/1 - the typechecker
% will catch calls to numbers and strings.
Goal = call_expr(Context, unqualified("call"), [ProgTerm],
purity_pure)
),
MaybeGoal = ok2(Goal, [])
).
%---------------------------------------------------------------------------%
parse_some_vars_goal(Term, ContextPieces, MaybeVarsAndGoal, !VarSet) :-
% We parse existentially quantified goals in non-DCG contexts here,
% while we parse them in DCG contexts in parse_some_vars_dcg_goal
% in parse_dcg_goal.m.
( if
Term = term.functor(term.atom("some"), [VarsTerm, SubGoalTerm],
_Context)
then
varset.coerce(!.VarSet, GenericVarSet),
VarsTailPieces = [lower_case_next_if_not_first,
words("In first argument of"), quote("some"), suffix(":")],
VarsContextPieces = ContextPieces ++ cord.from_list(VarsTailPieces),
parse_vars_state_vars(VarsTerm, GenericVarSet, VarsContextPieces,
MaybeVars),
GoalTerm = SubGoalTerm
else
MaybeVars = ok1(plain_state_vars([], [])),
GoalTerm = Term
),
parse_goal(GoalTerm, ContextPieces, MaybeGoal, !VarSet),
( if
MaybeVars = ok1(plain_state_vars(Vars0, StateVars0)),
MaybeGoal = ok2(Goal, SubGoalWarningSpecs)
then
list.map(term.coerce_var, Vars0, Vars),
list.map(term.coerce_var, StateVars0, StateVars),
MaybeVarsAndGoal = ok4(Vars, StateVars, Goal, SubGoalWarningSpecs)
else
Specs = get_any_errors1(MaybeVars) ++
get_any_errors_warnings2(MaybeGoal),
MaybeVarsAndGoal = error4(Specs)
).
%---------------------------------------------------------------------------%
% We parse goals in non-DCG contexts here, while we parse goals
% in DCG contexts in parse_non_call_dcg_goal in parse_dcg_goal.m.
%
% Since many kinds of goals can occur in both kinds of contexts,
% the code handling those kinds of goals should be kept as identical
% as possible in the two places. For ease of maintenance, the switch arms
% handling the common goal types should also be kept in the same order.
% The list below documents the order in both predicates. If you add
% code to handle a new goal type either here or there, please update
% this comment.
%
% In both parse_non_call_goal and parse_non_call_dcg_goal:
%
% impure/1, semipure/1
% promise_pure/1, promise_semipure/1, promise_impure/1
% disable_warnings/2
% not/1, \+/1
% some/2, all/2
% ,/2
% &/2
% ;/2 (disjunction, or C->T;E style if-then-else)
% else (if C then T else E style if-then-else;
% or try goal in parse_non_call_goal)
%
% Only in parse_non_call_goal, after the common goal types:
%
% then/2 (try goal)
% catch/2 (try goal)
% catch_any/2 (try goal)
% <=/2, =>/2, <=>/2 (implication, bi-implication)
% trace/2 (trace goals)
% atomic/2 (atomic goals)
% prom_eqv_{solns,sets}/2 (determinism cast)
% arbitrary/2 (determinism cast)
% req_{det,...}/2 (determinism check)
% req_compl_switch/2 (determinism check)
% req_sw_arms_{det,...}/2 (determinism check)
% event/2 (debugger event)
% true/0, fail/0 (empty conjunction/disjunction)
% =/2, is/2 (unification)
%
% Only in parse_non_call_dcg_goal, after the common goal types:
%
% if/2 (if C then T, with implicit "else")
% {}/1 (wrapping non-DCG goal)
% []/0 (consuming nothing from dcg)
% [|]/2 (consuming something from dcg)
% =/1 (reading current dcg var)
% :=/1 (writing to next dcg var)
%
% For the goal types that can occur in both DCG and non-DCG contexts,
% the code handling them here and in parse_non_call_dcg_goal is often
% very similar. These goal types are all compound, and they tend to differ
% only in whether they call parse_goal or parse_dcg_goal to handle their
% subgoals. However, factoring out the commonalities would nevertheless
% not be a good idea, for two reasons. Both relate to the fact that
% the common code would have to make a runtime decision between
% calling parse_goal and parse_dcg_goal on terms representing subgoals,
% and would have to pass around the arguments needed by parse_dcg_goal
% to make the latter choice possible.
%
% The first reason is simply that with this extra generality,
% the common code would not be significantly shorter OR simpler
% than the two specialized pieces of code put together.
%
% The second reason is that the extra tests and parameter passing
% would slow down the code in both contexts. For infrequently occurring
% kinds of goals, this wouldn't matter, but conjunctions and if-then-elses
% occur very frequently, and we don't want to pay any extra cost
% for parsing them.
:- type goal_kind
---> gk_impure
; gk_semipure
; gk_promise_impure
; gk_promise_semipure
; gk_promise_pure
; gk_disable_warning
; gk_disable_warnings
; gk_not
; gk_not_prolog
; gk_some
; gk_all
; gk_conj
; gk_par_conj
; gk_semicolon
; gk_else
; gk_if
; gk_then
; gk_catch
; gk_catch_any
; gk_imply_to_left
; gk_imply_to_right
; gk_imply_to_both
; gk_trace
; gk_atomic
; gk_promise_eqv_solns
; gk_promise_eqv_soln_sets
; gk_arbitrary
; gk_require_det
; gk_require_semidet
; gk_require_multi
; gk_require_nondet
; gk_require_cc_multi
; gk_require_cc_nondet
; gk_require_erroneous
; gk_require_failure
; gk_require_complete_switch
; gk_require_arms_det
; gk_require_arms_semidet
; gk_require_arms_multi
; gk_require_arms_nondet
; gk_require_arms_cc_multi
; gk_require_arms_cc_nondet
; gk_require_arms_erroneous
; gk_require_arms_failure
; gk_event
; gk_true
; gk_fail
; gk_equal.
:- inst goal_kind_purity for goal_kind/0
---> gk_impure
; gk_semipure.
:- inst goal_kind_promise_purity for goal_kind/0
---> gk_promise_impure
; gk_promise_semipure
; gk_promise_pure.
:- inst goal_kind_disable_warning for goal_kind/0
---> gk_disable_warning
; gk_disable_warnings.
:- inst goal_kind_not for goal_kind/0
---> gk_not
; gk_not_prolog.
:- inst goal_kind_some_all for goal_kind/0
---> gk_some
; gk_all.
:- inst goal_kind_conj for goal_kind/0
---> gk_conj.
:- inst goal_kind_par_conj for goal_kind/0
---> gk_par_conj.
:- inst goal_kind_implication for goal_kind/0
---> gk_imply_to_left
; gk_imply_to_right
; gk_imply_to_both.
:- inst goal_kind_promise_eqv_soln for goal_kind/0
---> gk_promise_eqv_solns
; gk_promise_eqv_soln_sets.
:- inst goal_kind_require_detism for goal_kind/0
---> gk_require_det
; gk_require_semidet
; gk_require_multi
; gk_require_nondet
; gk_require_cc_multi
; gk_require_cc_nondet
; gk_require_erroneous
; gk_require_failure.
:- inst goal_kind_require_arm_detism for goal_kind/0
---> gk_require_arms_det
; gk_require_arms_semidet
; gk_require_arms_multi
; gk_require_arms_nondet
; gk_require_arms_cc_multi
; gk_require_arms_cc_nondet
; gk_require_arms_erroneous
; gk_require_arms_failure.
:- inst goal_kind_true_fail for goal_kind/0
---> gk_true
; gk_fail.
:- pred string_goal_kind(string, goal_kind).
:- mode string_goal_kind(in, out) is semidet.
:- mode string_goal_kind(out, in) is det.
string_goal_kind(Functor, GoalKind) :-
( Functor = "impure", GoalKind = gk_impure
; Functor = "semipure", GoalKind = gk_semipure
; Functor = "promise_pure", GoalKind = gk_promise_pure
; Functor = "promise_semipure", GoalKind = gk_promise_semipure
; Functor = "promise_impure", GoalKind = gk_promise_impure
; Functor = "disable_warning", GoalKind = gk_disable_warning
; Functor = "disable_warnings", GoalKind = gk_disable_warnings
% Negation (NU-Prolog syntax).
; Functor = "not", GoalKind = gk_not
% Negation (Prolog syntax).
; Functor = "\\+", GoalKind = gk_not_prolog
; Functor = "some", GoalKind = gk_some
; Functor = "all", GoalKind = gk_all
; Functor = ",", GoalKind = gk_conj
; Functor = "&", GoalKind = gk_par_conj
; Functor = ";", GoalKind = gk_semicolon
% If-then-else (NU-Prolog syntax).
; Functor = "else", GoalKind = gk_else
% If-then-else (NU-Prolog syntax) with a missing "else".
; Functor = "if", GoalKind = gk_if
; Functor = "then", GoalKind = gk_then
; Functor = "catch", GoalKind = gk_catch
; Functor = "catch_any", GoalKind = gk_catch_any
; Functor = "<=", GoalKind = gk_imply_to_left
; Functor = "=>", GoalKind = gk_imply_to_right
; Functor = "<=>", GoalKind = gk_imply_to_both
; Functor = "trace", GoalKind = gk_trace
; Functor = "atomic", GoalKind = gk_atomic
; Functor = "promise_equivalent_solutions",
GoalKind = gk_promise_eqv_solns
; Functor = "promise_equivalent_solution_sets",
GoalKind = gk_promise_eqv_soln_sets
; Functor = "arbitrary", GoalKind = gk_arbitrary
; Functor = "require_det", GoalKind = gk_require_det
; Functor = "require_semidet", GoalKind = gk_require_semidet
; Functor = "require_multi", GoalKind = gk_require_multi
; Functor = "require_nondet", GoalKind = gk_require_nondet
; Functor = "require_cc_multi", GoalKind = gk_require_cc_multi
; Functor = "require_cc_nondet", GoalKind = gk_require_cc_nondet
; Functor = "require_erroneous", GoalKind = gk_require_erroneous
; Functor = "require_failure", GoalKind = gk_require_failure
; Functor = "require_complete_switch",
GoalKind = gk_require_complete_switch
; Functor = "require_switch_arms_det",
GoalKind = gk_require_arms_det
; Functor = "require_switch_arms_semidet",
GoalKind = gk_require_arms_semidet
; Functor = "require_switch_arms_multi",
GoalKind = gk_require_arms_multi
; Functor = "require_switch_arms_nondet",
GoalKind = gk_require_arms_nondet
; Functor = "require_switch_arms_cc_multi",
GoalKind = gk_require_arms_cc_multi
; Functor = "require_switch_arms_cc_nondet",
GoalKind = gk_require_arms_cc_nondet
; Functor = "require_switch_arms_erroneous",
GoalKind = gk_require_arms_erroneous
; Functor = "require_switch_arms_failure",
GoalKind = gk_require_arms_failure
; Functor = "event", GoalKind = gk_event
; Functor = "true", GoalKind = gk_true
; Functor = "fail", GoalKind = gk_fail
; Functor = "=", GoalKind = gk_equal
).
:- pred parse_non_call_goal(goal_kind::in, list(term)::in, term.context::in,
cord(format_piece)::in, maybe2(goal, list(warning_spec))::out,
prog_varset::in, prog_varset::out) is det.
parse_non_call_goal(GoalKind, Args, Context, ContextPieces, MaybeGoal,
!VarSet) :-
% XXX We should update ContextPieces at every call to parse a goal
% component that is not itself a goal.
(
( GoalKind = gk_impure
; GoalKind = gk_semipure
),
parse_goal_impure_semipure(GoalKind, Args, Context, ContextPieces,
MaybeGoal, !VarSet)
;
( GoalKind = gk_promise_pure
; GoalKind = gk_promise_semipure
; GoalKind = gk_promise_impure
),
parse_goal_promise_purity(GoalKind, Args, Context, ContextPieces,
MaybeGoal, !VarSet)
;
( GoalKind = gk_disable_warning
; GoalKind = gk_disable_warnings
),
parse_goal_disable_warnings(GoalKind, Args, Context, ContextPieces,
MaybeGoal, !VarSet)
;
( GoalKind = gk_not
; GoalKind = gk_not_prolog
),
parse_goal_not(GoalKind, Args, Context, ContextPieces,
MaybeGoal, !VarSet)
;
( GoalKind = gk_some
; GoalKind = gk_all
),
parse_goal_some_all(GoalKind, Args, Context, ContextPieces,
MaybeGoal, !VarSet)
;
GoalKind = gk_conj,
% We select the in(gk_conj) mode of parse_goal_conj.
parse_goal_conj(GoalKind, Args, Context, ContextPieces,
MaybeGoal, !VarSet)
;
GoalKind = gk_par_conj,
% We select the in(gk_par_conj) mode of parse_goal_conj.
parse_goal_conj(GoalKind, Args, Context, ContextPieces,
MaybeGoal, !VarSet)
;
GoalKind = gk_semicolon,
parse_goal_semicolon(Args, Context, ContextPieces, MaybeGoal, !VarSet)
;
GoalKind = gk_else,
% If-then-else (NU-Prolog syntax).
parse_goal_else(Args, Context, ContextPieces, MaybeGoal, !VarSet)
;
GoalKind = gk_if,
parse_goal_if(Args, Context, ContextPieces, MaybeGoal)
;
GoalKind = gk_then,
parse_goal_then(Args, Context, ContextPieces, MaybeGoal, !VarSet)
;
GoalKind = gk_catch,
parse_catch_then_try_term_args(Args, no, Context, ContextPieces,
MaybeGoal, !VarSet)
;
GoalKind = gk_catch_any,
parse_goal_catch_any(Args, Context, ContextPieces, MaybeGoal, !VarSet)
;
( GoalKind = gk_imply_to_left
; GoalKind = gk_imply_to_right
; GoalKind = gk_imply_to_both
),
parse_goal_implication(GoalKind, Args, Context, ContextPieces,
MaybeGoal, !VarSet)
;
GoalKind = gk_trace,
parse_goal_trace(Args, Context, ContextPieces, MaybeGoal, !VarSet)
;
GoalKind = gk_atomic,
parse_goal_atomic(Args, Context, ContextPieces, MaybeGoal, !VarSet)
;
( GoalKind = gk_promise_eqv_solns
; GoalKind = gk_promise_eqv_soln_sets
),
parse_goal_promise_eqv_solns(GoalKind, Args, Context, ContextPieces,
MaybeGoal, !VarSet)
;
GoalKind = gk_arbitrary,
parse_goal_arbitrary(Args, Context, ContextPieces, MaybeGoal, !VarSet)
;
( GoalKind = gk_require_det
; GoalKind = gk_require_semidet
; GoalKind = gk_require_multi
; GoalKind = gk_require_nondet
; GoalKind = gk_require_cc_multi
; GoalKind = gk_require_cc_nondet
; GoalKind = gk_require_erroneous
; GoalKind = gk_require_failure
),
parse_goal_require_detism(GoalKind, Args, Context, ContextPieces,
MaybeGoal, !VarSet)
;
GoalKind = gk_require_complete_switch,
parse_goal_require_complete_switch(Args, Context, ContextPieces,
MaybeGoal, !VarSet)
;
( GoalKind = gk_require_arms_det
; GoalKind = gk_require_arms_semidet
; GoalKind = gk_require_arms_multi
; GoalKind = gk_require_arms_nondet
; GoalKind = gk_require_arms_cc_multi
; GoalKind = gk_require_arms_cc_nondet
; GoalKind = gk_require_arms_erroneous
; GoalKind = gk_require_arms_failure
),
parse_goal_require_switch_arm_detism(GoalKind, Args,
Context, ContextPieces, MaybeGoal, !VarSet)
;
GoalKind = gk_event,
parse_goal_event(Args, Context, ContextPieces, MaybeGoal, !VarSet)
;
( GoalKind = gk_true
; GoalKind = gk_fail
),
parse_goal_true_fail(GoalKind, Args, Context, ContextPieces, MaybeGoal)
;
GoalKind = gk_equal,
parse_goal_equal(!.VarSet, Args, Context, ContextPieces, MaybeGoal)
).
%---------------------%
:- pred parse_goal_impure_semipure(goal_kind::in(goal_kind_purity),
list(term)::in, term.context::in, cord(format_piece)::in,
maybe2(goal, list(warning_spec))::out,
prog_varset::in, prog_varset::out) is det.
:- pragma inline(pred(parse_goal_impure_semipure/7)).
parse_goal_impure_semipure(GoalKind, ArgTerms, Context, ContextPieces,
MaybeGoal, !VarSet) :-
( GoalKind = gk_impure, Purity = purity_impure
; GoalKind = gk_semipure, Purity = purity_semipure
),
( if ArgTerms = [SubGoalTerm] then
parse_goal(SubGoalTerm, ContextPieces, MaybeGoal0, !VarSet),
apply_purity_marker_to_maybe_goal(SubGoalTerm, Purity,
MaybeGoal0, MaybeGoal)
else
string_goal_kind(Functor, GoalKind),
Spec = should_have_one_goal_prefix(ContextPieces, Context, Functor),
MaybeGoal = error2([Spec])
).
%---------------------%
:- pred parse_goal_promise_purity(goal_kind::in(goal_kind_promise_purity),
list(term)::in, term.context::in, cord(format_piece)::in,
maybe2(goal, list(warning_spec))::out,
prog_varset::in, prog_varset::out) is det.
:- pragma inline(pred(parse_goal_promise_purity/7)).
parse_goal_promise_purity(GoalKind, ArgTerms, Context, ContextPieces,
MaybeGoal, !VarSet) :-
( GoalKind = gk_promise_pure, Purity = purity_pure
; GoalKind = gk_promise_semipure, Purity = purity_semipure
; GoalKind = gk_promise_impure, Purity = purity_impure
),
( if ArgTerms = [SubGoalTerm] then
parse_goal(SubGoalTerm, ContextPieces, MaybeSubGoal, !VarSet),
(
MaybeSubGoal = ok2(SubGoal, SubGoalWarningSpecs),
Goal = promise_purity_expr(Context, Purity, SubGoal),
MaybeGoal = ok2(Goal, SubGoalWarningSpecs)
;
MaybeSubGoal = error2(Specs),
MaybeGoal = error2(Specs)
)
else
string_goal_kind(Functor, GoalKind),
Spec = should_have_one_goal_prefix(ContextPieces, Context, Functor),
MaybeGoal = error2([Spec])
).
%---------------------%
:- pred parse_goal_disable_warnings(goal_kind::in(goal_kind_disable_warning),
list(term)::in, term.context::in, cord(format_piece)::in,
maybe2(goal, list(warning_spec))::out,
prog_varset::in, prog_varset::out) is det.
:- pragma inline(pred(parse_goal_disable_warnings/7)).
parse_goal_disable_warnings(GoalKind, ArgTerms, Context, ContextPieces,
MaybeGoal, !VarSet) :-
string_goal_kind(Functor, GoalKind),
( if ArgTerms = [WarningsTerm, SubGoalTerm] then
varset.coerce(!.VarSet, GenericVarSet),
parse_warnings(GenericVarSet, WarningsTerm, Functor,
ContextPieces, 1, MaybeWarnings),
parse_goal(SubGoalTerm, ContextPieces, MaybeSubGoal, !VarSet),
( if
MaybeWarnings = ok2(Warnings, WarningsWarningSpecs),
MaybeSubGoal = ok2(SubGoal, SubGoalWarningSpecs)
then
WarningSpecs = WarningsWarningSpecs ++ SubGoalWarningSpecs,
WarningsContext = get_term_context(WarningsTerm),
bag.insert_list(Warnings, bag.init, WarningsBag),
bag.to_assoc_list(WarningsBag, WarningsCounts),
generate_warnings_for_duplicate_warnings(WarningsContext,
ContextPieces, WarningsCounts,
NonDuplicateWarnings, DuplicateSpecs),
(
DuplicateSpecs = [],
(
NonDuplicateWarnings = [HeadWarning | TailWarnings],
Goal = disable_warnings_expr(Context,
HeadWarning, TailWarnings, SubGoal),
MaybeGoal = ok2(Goal, WarningSpecs)
;
NonDuplicateWarnings = [],
(
WarningsWarningSpecs = [],
Pieces = cord.list(ContextPieces) ++
[lower_case_next_if_not_first,
words("Error:"), words("a")] ++
color_as_subject([fixed(Functor),
words("scope")]) ++
color_as_incorrect([words("must list"),
words("at least one warning.")]) ++
[nl],
Spec = spec($pred, severity_error, phase_t2pt,
WarningsContext, Pieces),
MaybeGoal = error2([Spec | WarningSpecs])
;
WarningsWarningSpecs = [_ | _],
% We get here if WarningsTerm is a well formed list
% but contains only elements that are *not*
% warning names. Generating the error message
% immediately above would be misleading, since
% the user seemingly *did* try to put a warning
% in the warning list, he/she just failed at it.
% But we don't have any valid warnings for a
% disable_warnings scope either. In this case, we just
% forgo constructing a scope that would have no effect.
MaybeGoal = ok2(SubGoal, WarningSpecs)
)
)
;
DuplicateSpecs = [_ | _],
MaybeGoal = error2(DuplicateSpecs ++ WarningSpecs)
)
else
Specs = get_any_errors_warnings2(MaybeWarnings) ++
get_any_errors_warnings2(MaybeSubGoal),
MaybeGoal = error2(Specs)
)
else
Spec = should_have_one_x_one_goal_prefix(ContextPieces, Context,
"a list of warnings to disable", Functor),
MaybeGoal = error2([Spec])
).
%---------------------%
:- pred parse_goal_not(goal_kind::in(goal_kind_not), list(term)::in,
term.context::in, cord(format_piece)::in,
maybe2(goal, list(warning_spec))::out,
prog_varset::in, prog_varset::out) is det.
:- pragma inline(pred(parse_goal_not/7)).
parse_goal_not(GoalKind, ArgTerms, Context, ContextPieces, MaybeGoal,
!VarSet) :-
( if ArgTerms = [SubGoalTerm] then
parse_goal(SubGoalTerm, ContextPieces, MaybeSubGoal, !VarSet),
(
MaybeSubGoal = ok2(SubGoal, SubGoalWarningSpecs),
Goal = not_expr(Context, SubGoal),
MaybeGoal = ok2(Goal, SubGoalWarningSpecs)
;
MaybeSubGoal = error2(Specs),
MaybeGoal = error2(Specs)
)
else
string_goal_kind(Functor, GoalKind),
Spec = should_have_one_goal_prefix(ContextPieces, Context, Functor),
MaybeGoal = error2([Spec])
).
%---------------------%
:- pred parse_goal_some_all(goal_kind::in(goal_kind_some_all),
list(term)::in, term.context::in, cord(format_piece)::in,
maybe2(goal, list(warning_spec))::out,
prog_varset::in, prog_varset::out) is det.
:- pragma inline(pred(parse_goal_some_all/7)).
parse_goal_some_all(GoalKind, ArgTerms, Context, ContextPieces,
MaybeGoal, !VarSet) :-
(
GoalKind = gk_some,
Functor = "some",
QuantType = quant_some,
VarsTailPieces = [lower_case_next_if_not_first,
words("In first argument of"), quote("some"), suffix(":")]
;
GoalKind = gk_all,
Functor = "all",
QuantType = quant_all,
VarsTailPieces = [lower_case_next_if_not_first,
words("In first argument of"), quote("all"), suffix(":")]
),
( if ArgTerms = [QVarsTerm, SubGoalTerm] then
varset.coerce(!.VarSet, GenericVarSet),
VarsContextPieces = ContextPieces ++ cord.from_list(VarsTailPieces),
parse_vars_state_vars(QVarsTerm, GenericVarSet, VarsContextPieces,
MaybeVars),
parse_goal(SubGoalTerm, ContextPieces, MaybeSubGoal, !VarSet),
( if
MaybeVars = ok1(plain_state_vars(Vars0, StateVars0)),
MaybeSubGoal = ok2(SubGoal, SubGoalWarningSpecs)
then
list.map(term.coerce_var, Vars0, Vars),
list.map(term.coerce_var, StateVars0, StateVars),
(
StateVars = [],
Goal1 = SubGoal
;
StateVars = [_ | _],
Goal1 = quant_expr(QuantType, quant_state_vars, Context,
StateVars, SubGoal)
),
(
Vars = [],
Goal = Goal1
;
Vars = [_ | _],
Goal = quant_expr(QuantType, quant_ordinary_vars, Context,
Vars, Goal1)
),
MaybeGoal = ok2(Goal, SubGoalWarningSpecs)
else
Specs = get_any_errors1(MaybeVars) ++
get_any_errors_warnings2(MaybeSubGoal),
MaybeGoal = error2(Specs)
)
else
Spec = should_have_one_x_one_goal_prefix(ContextPieces, Context,
"a list of variables", Functor),
MaybeGoal = error2([Spec])
).
%---------------------%
% Although we do almost exactly the same thing for "&" as for ",",
% we handle them in separate modes, because "," is FAR more common
% than "&", and keeping its processing efficient is important enough
% to warrant a small amount of target language code duplication.
%
:- pred parse_goal_conj(goal_kind, list(term),
term.context, cord(format_piece),
maybe2(goal, list(warning_spec)), prog_varset, prog_varset).
:- mode parse_goal_conj(in(goal_kind_conj),
in, in, in, out, in, out) is det.
:- mode parse_goal_conj(in(goal_kind_par_conj),
in, in, in, out, in, out) is det.
:- pragma inline(pred(parse_goal_conj/7)).
parse_goal_conj(GoalKind, ArgTerms, Context, ContextPieces,
MaybeGoal, !VarSet) :-
string_goal_kind(Functor, GoalKind),
( if ArgTerms = [SubGoalTermA, SubGoalTermB] then
parse_goal_conjunction(Functor, SubGoalTermA, SubGoalTermB,
ContextPieces, cord.init, ConjunctsCord, [], WarningSpecs,
[], ErrorSpecs, !VarSet),
(
ErrorSpecs = [],
Conjuncts = cord.list(ConjunctsCord),
(
Conjuncts = [],
unexpected($pred, "no Conjuncts")
;
Conjuncts = [Conjunct1 | Conjuncts2plus]
),
(
GoalKind = gk_conj,
Goal = conj_expr(Context, Conjunct1, Conjuncts2plus)
;
GoalKind = gk_par_conj,
Goal = par_conj_expr(Context, Conjunct1, Conjuncts2plus)
),
MaybeGoal = ok2(Goal, WarningSpecs)
;
ErrorSpecs = [_ | _],
MaybeGoal = error2(ErrorSpecs)
)
else
Spec = should_have_two_goals_infix(ContextPieces, Context, Functor),
MaybeGoal = error2([Spec])
).
:- pred parse_goal_conjunction(string::in, term::in, term::in,
cord(format_piece)::in, cord(goal)::in, cord(goal)::out,
list(warning_spec)::in, list(warning_spec)::out,
list(error_spec)::in, list(error_spec)::out,
prog_varset::in, prog_varset::out) is det.
% Don't inline this predicate, since it is recursive.
parse_goal_conjunction(Functor, TermA, TermB, ContextPieces, !ConjunctsCord,
!Warnings, !Specs, !VarSet) :-
parse_goal(TermA, ContextPieces, MaybeGoalA, !VarSet),
(
MaybeGoalA = ok2(ConjunctA, WarningsA),
cord.snoc(ConjunctA, !ConjunctsCord),
!:Warnings = WarningsA ++ !.Warnings
;
MaybeGoalA = error2(SpecsA),
!:Specs = !.Specs ++ SpecsA
),
( if
TermB = term.functor(term.atom(Functor), ArgTermsB, _Context),
ArgTermsB = [TermBA, TermBB]
then
parse_goal_conjunction(Functor, TermBA, TermBB, ContextPieces,
!ConjunctsCord, !Warnings, !Specs, !VarSet)
else
parse_goal(TermB, ContextPieces, MaybeGoalB, !VarSet),
(
MaybeGoalB = ok2(ConjunctB, WarningsB),
cord.snoc(ConjunctB, !ConjunctsCord),
!:Warnings = !.Warnings ++ WarningsB
;
MaybeGoalB = error2(SpecsB),
!:Specs = !.Specs ++ SpecsB
)
).
%---------------------%
:- pred parse_goal_semicolon(list(term)::in,
term.context::in, cord(format_piece)::in,
maybe2(goal, list(warning_spec))::out,
prog_varset::in, prog_varset::out) is det.
:- pragma inline(pred(parse_goal_semicolon/6)).
parse_goal_semicolon(ArgTerms, Context, ContextPieces, MaybeGoal, !VarSet) :-
( if ArgTerms = [SubGoalTermA, SubGoalTermB] then
( if
SubGoalTermA = term.functor(term.atom("->"),
[CondGoalTerm, ThenGoalTerm], _)
then
ElseGoalTerm = SubGoalTermB,
parse_some_vars_goal(CondGoalTerm, ContextPieces, MaybeCondGoal,
!VarSet),
parse_goal(ThenGoalTerm, ContextPieces, MaybeThenGoal, !VarSet),
parse_goal(ElseGoalTerm, ContextPieces, MaybeElseGoal, !VarSet),
( if
MaybeCondGoal =
ok4(Vars, StateVars, CondGoal, CondWarningSpecs),
MaybeThenGoal = ok2(ThenGoal, ThenWarningSpecs),
MaybeElseGoal = ok2(ElseGoal, ElseWarningSpecs)
then
Goal = if_then_else_expr(Context, Vars, StateVars,
CondGoal, ThenGoal, ElseGoal),
WarningSpecs = CondWarningSpecs ++
ThenWarningSpecs ++ ElseWarningSpecs,
MaybeGoal = ok2(Goal, WarningSpecs)
else
Specs = get_any_errors_warnings4(MaybeCondGoal) ++
get_any_errors_warnings2(MaybeThenGoal) ++
get_any_errors_warnings2(MaybeElseGoal),
MaybeGoal = error2(Specs)
)
else
parse_goal_disjunction(SubGoalTermA, SubGoalTermB, ContextPieces,
cord.init, DisjunctsCord, [], WarningSpecs, [], ErrorSpecs,
!VarSet),
(
ErrorSpecs = [],
Disjuncts = cord.list(DisjunctsCord),
(
( Disjuncts = []
; Disjuncts = [_]
),
unexpected($pred, "less than two disjuncts")
;
Disjuncts = [Disjunct1, Disjunct2 | Disjuncts3plus]
),
Goal = disj_expr(Context, Disjunct1, Disjunct2,
Disjuncts3plus),
MaybeGoal = ok2(Goal, WarningSpecs)
;
ErrorSpecs = [_ | _],
MaybeGoal = error2(ErrorSpecs)
)
)
else
% XXX This generates an error message that is appropriate for goals
% that are intended to be disjunctions. Should we instead generate
% a message that also talks about if-then-elses using (C->T;E) syntax?
% It would be more complete, but also more complex, and therefore
% potentially more confusing than helpful.
% We do the same for ";" in parse_non_call_dcg_goal.
Spec = should_have_two_goals_infix(ContextPieces, Context, ";"),
MaybeGoal = error2([Spec])
).
:- pred parse_goal_disjunction(term::in, term::in, cord(format_piece)::in,
cord(goal)::in, cord(goal)::out,
list(warning_spec)::in, list(warning_spec)::out,
list(error_spec)::in, list(error_spec)::out,
prog_varset::in, prog_varset::out) is det.
% Don't inline this predicate, since it is recursive.
parse_goal_disjunction(TermA, TermB, ContextPieces, !DisjunctsCord,
!Warnings, !Specs, !VarSet) :-
parse_goal(TermA, ContextPieces, MaybeGoalA, !VarSet),
(
MaybeGoalA = ok2(DisjunctA, WarningsA),
append_disjunct_to_cord(DisjunctA, !DisjunctsCord),
% The order of the warnings does not matter.
!:Warnings = WarningsA ++ !.Warnings
;
MaybeGoalA = error2(SpecsA),
!:Specs = !.Specs ++ SpecsA
),
( if
TermB = term.functor(term.atom(";"), ArgTermsB, _Context),
ArgTermsB = [TermBA, TermBB],
not (
TermBA = term.functor(term.atom("->"), [_, _], _)
)
then
parse_goal_disjunction(TermBA, TermBB, ContextPieces, !DisjunctsCord,
!Warnings, !Specs, !VarSet)
else
parse_goal(TermB, ContextPieces, MaybeGoalB, !VarSet),
(
MaybeGoalB = ok2(DisjunctB, WarningsB),
cord.snoc(DisjunctB, !DisjunctsCord),
!:Warnings = !.Warnings ++ WarningsB
;
MaybeGoalB = error2(SpecsB),
!:Specs = !.Specs ++ SpecsB
)
).
:- pred append_disjunct_to_cord(goal::in,
cord(goal)::in, cord(goal)::out) is det.
append_disjunct_to_cord(Goal, !DisjunctsCord) :-
% We flatten disjunctions, for reasons explained in the comment
% at the top of tests/hard_coded/flatten_disjunctions.m.
( if Goal = disj_expr(_Ctxt, Disjunct1, Disjunct2, Disjuncts3plus) then
append_disjunct_to_cord(Disjunct1, !DisjunctsCord),
append_disjunct_to_cord(Disjunct2, !DisjunctsCord),
list.foldl(append_disjunct_to_cord, Disjuncts3plus, !DisjunctsCord)
else
cord.snoc(Goal, !DisjunctsCord)
).
%---------------------%
:- pred parse_goal_else(list(term)::in,
term.context::in, cord(format_piece)::in,
maybe2(goal, list(warning_spec))::out,
prog_varset::in, prog_varset::out) is det.
:- pragma inline(pred(parse_goal_else/6)).
parse_goal_else(ArgTerms, Context, ContextPieces, MaybeGoal, !VarSet) :-
( if ArgTerms = [CondThenTerm, ElseTerm] then
( if
CondThenTerm = term.functor(term.atom("if"),
[term.functor(term.atom("then"), [CondTerm, ThenTerm], _)],
CondContext)
then
parse_some_vars_goal(CondTerm, ContextPieces, MaybeCondGoal,
!VarSet),
parse_goal(ThenTerm, ContextPieces, MaybeThenGoal, !VarSet),
parse_goal(ElseTerm, ContextPieces, MaybeElseGoal, !VarSet),
( if
MaybeCondGoal =
ok4(Vars, StateVars, CondGoal, CondWarningSpecs),
MaybeThenGoal = ok2(ThenGoal, ThenWarningSpecs),
MaybeElseGoal = ok2(ElseGoal, ElseWarningSpecs)
then
Goal = if_then_else_expr(CondContext, Vars, StateVars,
CondGoal, ThenGoal, ElseGoal),
WarningSpecs = CondWarningSpecs ++
ThenWarningSpecs ++ ElseWarningSpecs,
MaybeGoal = ok2(Goal, WarningSpecs)
else
Specs = get_any_errors_warnings4(MaybeCondGoal) ++
get_any_errors_warnings2(MaybeThenGoal) ++
get_any_errors_warnings2(MaybeElseGoal),
MaybeGoal = error2(Specs)
)
else if
CondThenTerm = term.functor(term.atom("if"),
[term.functor(term.atom("->"),
[_CondGoalTerm, _ThenGoalTerm], ArrowContext)],
_CondContext)
then
Pieces = [words("Error: malformed if-then-else;")] ++
color_as_incorrect([words("replace the"), quote("->"),
words("with"), quote("then"), suffix(".")]) ++
[nl],
Spec = spec($pred, severity_error, phase_t2pt,
ArrowContext, Pieces),
MaybeGoal = error2([Spec])
else if
CondThenTerm = term.functor(term.atom("->"),
[_CondGoalTerm, _ThenGoalTerm], ArrowContext)
then
Pieces = [words("Error: malformed if-then-else;")] ++
color_as_incorrect([words("replace the"), quote("->"),
words("with"), quote("then"), suffix(","),
words("and add an"), quote("if"),
words("before the condition.")]) ++
[nl],
Spec = spec($pred, severity_error, phase_t2pt,
ArrowContext, Pieces),
MaybeGoal = error2([Spec])
else
% `else' can also be part of a `try' goal.
FullTerm = term.functor(term.atom("else"),
[CondThenTerm, ElseTerm], Context),
parse_else_then_try_term(FullTerm, [], no, Context, ContextPieces,
MaybeGoal, !VarSet)
)
else
% XXX This generates an error message that is appropriate for goals
% that are intended to be if-then-elses. Should we instead generate
% a message that also talks about try goals? It would be more complete,
% but also more complex, and therefore more likely to be confusing
% than helpful, since try goals are *much* rarer than if-then-elses.
Pieces = [words("Error: the")] ++
color_as_subject([quote("else"), words("operator")]) ++
color_as_incorrect(
[words("should occur in expressions of the form")]) ++
color_as_correct([quote("( if goal then goal else goal )"),
suffix(".")]) ++
[nl],
Spec = spec($pred, severity_error, phase_t2pt, Context, Pieces),
MaybeGoal = error2([Spec])
).
%---------------------%
:- pred parse_goal_if(list(term)::in,
term.context::in, cord(format_piece)::in,
maybe2(goal, list(warning_spec))::out) is det.
:- pragma inline(pred(parse_goal_if/4)).
parse_goal_if(ArgTerms, Context, _ContextPieces, MaybeGoal) :-
( if
ArgTerms = [term.functor(term.atom("then"),
[_CondGoalTerm, ThenGoalTerm], ThenContext)]
then
( if
ThenGoalTerm = term.functor(term.atom(";"),
[_, _], SemiColonContext)
then
Pieces =
[words("Error: malformed if-then-else;")] ++
color_as_incorrect([words("replace the"), quote(";"),
words("with"), quote("else"), suffix(".")]) ++
[nl],
Spec = spec($pred, severity_error, phase_t2pt,
SemiColonContext, Pieces)
else
Pieces =
[words("Error: malformed if-then-else;")] ++
color_as_incorrect([words("this"), quote("then"),
words("has no"), quote("else"), suffix(".")]) ++
[nl],
Spec = spec($pred, severity_error, phase_t2pt, ThenContext, Pieces)
)
else
Pieces =
[words("Error: malformed if-then-else;")] ++
color_as_incorrect([words("this"), quote("if"),
words("has no"), quote("then"), suffix(".")]) ++
[nl],
Spec = spec($pred, severity_error, phase_t2pt, Context, Pieces)
),
MaybeGoal = error2([Spec]).
%---------------------%
:- pred parse_goal_then(list(term)::in,
term.context::in, cord(format_piece)::in,
maybe2(goal, list(warning_spec))::out,
prog_varset::in, prog_varset::out) is det.
:- pragma inline(pred(parse_goal_then/6)).
parse_goal_then(ArgTerms, Context, ContextPieces, MaybeGoal, !VarSet) :-
( if ArgTerms = [TryTerm, ThenTerm] then
( if
ThenTerm = term.functor(term.atom(";"), [_, _], SemiColonContext)
then
% The term we are parsing is not a valid try goal.
% It is much more likely to be a malformed if-then-else
% than a malformed try goal, so generate an error message
% that is more informative in the common case.
Pieces =
[words("Error: malformed if-then-else;")] ++
color_as_incorrect([words("replace the"), quote(";"),
words("with"), quote("else"), suffix(".")]) ++
[nl],
Spec = spec($pred, severity_error, phase_t2pt,
SemiColonContext, Pieces),
MaybeGoal = error2([Spec])
else
parse_then_try_term(
term.functor(atom("then"), [TryTerm, ThenTerm], Context),
no, [], no, Context, ContextPieces, MaybeGoal, !VarSet)
)
else
% Since there was no "else" wrapped around this use of "then",
% it is quite likely that this may have been intended to be a try goal.
% XXX Should we list all the things that may follow
% the initial part of a try goal?
Pieces =
[words("Error: the ")] ++
color_as_subject([quote("then"), words("operator,")]) ++
color_as_incorrect([words("should be used")]) ++
[words("either in an expression of the form")] ++
color_as_correct([quote("( if goal then goal else goal )"),
suffix(",")]) ++
[words("or in an expression of the form")] ++
color_as_correct(
[quote("try [try_params] main_goal then success_goal"),
suffix(",")]) ++
[words("optionally followed by")] ++
color_as_correct([quote("else failure_goal"), suffix(",")]) ++
[words("which in turn may be followed by zero or more"),
quote("catch"), words("clauses, and optionally by a single"),
quote("catch_any"), words("clause."), nl],
Spec = spec($pred, severity_error, phase_t2pt, Context, Pieces),
MaybeGoal = error2([Spec])
).
%---------------------%
:- pred parse_goal_catch_any(list(term)::in,
term.context::in, cord(format_piece)::in,
maybe2(goal, list(warning_spec))::out,
prog_varset::in, prog_varset::out) is det.
:- pragma inline(pred(parse_goal_catch_any/6)).
parse_goal_catch_any(ArgTerms, Context, ContextPieces, MaybeGoal, !VarSet) :-
( if ArgTerms = [TermA, ArrowTerm] then
parse_catch_any_term(ArrowTerm, Context, ContextPieces,
MaybeCatchAnyExpr, !VarSet),
(
MaybeCatchAnyExpr = ok2(CatchAnyExpr, CatchWarningSpecs),
( if TermA = term.functor(atom("catch"), TermAArgs, _) then
parse_catch_then_try_term_args(TermAArgs, yes(CatchAnyExpr),
Context, ContextPieces, MaybeGoal0, !VarSet)
else
parse_else_then_try_term(TermA, [], yes(CatchAnyExpr),
Context, ContextPieces, MaybeGoal0, !VarSet)
),
(
MaybeGoal0 = ok2(Goal, GoalWarningSpecs),
MaybeGoal = ok2(Goal, CatchWarningSpecs ++ GoalWarningSpecs)
;
MaybeGoal0 = error2(Specs),
MaybeGoal = error2(CatchWarningSpecs ++ Specs)
)
;
MaybeCatchAnyExpr = error2(Specs),
MaybeGoal = error2(Specs)
)
else
Pieces = [words("Error: the")] ++
color_as_subject([quote("catch_any"), words("operator")]) ++
color_as_incorrect([words("should be preceded by")]) ++
[words("a try expression, with a then-clause,"),
words("optional else-clause and zero or more catch clauses,"),
words("and should be followed by an expression of the form"),
quote("variable -> goal"), suffix("."), nl],
Spec = spec($pred, severity_error, phase_t2pt, Context, Pieces),
MaybeGoal = error2([Spec])
).
%---------------------%
:- pred parse_goal_implication(goal_kind::in(goal_kind_implication),
list(term)::in, term.context::in, cord(format_piece)::in,
maybe2(goal, list(warning_spec))::out,
prog_varset::in, prog_varset::out) is det.
:- pragma inline(pred(parse_goal_implication/7)).
parse_goal_implication(GoalKind, ArgTerms, Context, ContextPieces,
MaybeGoal, !VarSet) :-
( if ArgTerms = [TermA, TermB] then
parse_goal(TermA, ContextPieces, MaybeGoalA, !VarSet),
parse_goal(TermB, ContextPieces, MaybeGoalB, !VarSet),
( if
MaybeGoalA = ok2(GoalA, GoalWarningSpecsA),
MaybeGoalB = ok2(GoalB, GoalWarningSpecsB)
then
(
GoalKind = gk_imply_to_left,
Goal = implies_expr(Context, GoalB, GoalA)
;
GoalKind = gk_imply_to_right,
Goal = implies_expr(Context, GoalA, GoalB)
;
GoalKind = gk_imply_to_both,
Goal = equivalent_expr(Context, GoalA, GoalB)
),
WarningSpecs = GoalWarningSpecsA ++ GoalWarningSpecsB,
MaybeGoal = ok2(Goal, WarningSpecs)
else
Specs = get_any_errors_warnings2(MaybeGoalA) ++
get_any_errors_warnings2(MaybeGoalB),
MaybeGoal = error2(Specs)
)
else
string_goal_kind(Functor, GoalKind),
Spec = should_have_two_goals_infix(ContextPieces, Context, Functor),
MaybeGoal = error2([Spec])
).
%---------------------%
:- pred parse_goal_trace(list(term)::in,
term.context::in, cord(format_piece)::in,
maybe2(goal, list(warning_spec))::out,
prog_varset::in, prog_varset::out) is det.
:- pragma inline(pred(parse_goal_trace/6)).
parse_goal_trace(ArgTerms, Context, ContextPieces, MaybeGoal, !VarSet) :-
( if ArgTerms = [ParamsTerm, SubGoalTerm] then
varset.coerce(!.VarSet, GenericVarSet),
parse_trace_params(GenericVarSet, Context, ParamsTerm, MaybeParams),
parse_goal(SubGoalTerm, ContextPieces, MaybeSubGoal, !VarSet),
( if
MaybeParams = ok1(Params),
MaybeSubGoal = ok2(SubGoal, SubGoalWarningSpecs)
then
convert_trace_params(Params, MaybeComponents),
(
MaybeComponents = ok4(CompileTime, RunTime, MaybeIO, MutVars),
Goal = trace_expr(Context, CompileTime, RunTime,
MaybeIO, MutVars, SubGoal),
MaybeGoal = ok2(Goal, SubGoalWarningSpecs)
;
MaybeComponents = error4(Specs),
MaybeGoal = error2(Specs ++ SubGoalWarningSpecs)
)
else
Specs = get_any_errors1(MaybeParams) ++
get_any_errors_warnings2(MaybeSubGoal),
MaybeGoal = error2(Specs)
)
else
Spec = should_have_one_x_one_goal_prefix(ContextPieces, Context,
"a list of trace parameters", "trace"),
MaybeGoal = error2([Spec])
).
%---------------------%
:- pred parse_goal_atomic(list(term)::in,
term.context::in, cord(format_piece)::in,
maybe2(goal, list(warning_spec))::out,
prog_varset::in, prog_varset::out) is det.
:- pragma inline(pred(parse_goal_atomic/6)).
parse_goal_atomic(ArgTerms, Context, ContextPieces, MaybeGoal, !VarSet) :-
( if ArgTerms = [ParamsTerm, SubGoalsTerm] then
varset.coerce(!.VarSet, GenericVarSet),
parse_atomic_params(Context, ParamsTerm, GenericVarSet, MaybeParams),
parse_atomic_subgoals(SubGoalsTerm, MaybeSubGoals, !VarSet),
( if
MaybeParams = ok1(Params),
MaybeSubGoals = ok3(MainGoal, OrElseGoals, SubGoalWarningSpecs)
then
convert_atomic_params(ParamsTerm, Params, MaybeComponents),
(
MaybeComponents = ok3(Outer, Inner, MaybeOutputVars),
Goal = atomic_expr(Context, Outer, Inner, MaybeOutputVars,
MainGoal, OrElseGoals),
MaybeGoal = ok2(Goal, SubGoalWarningSpecs)
;
MaybeComponents = error3(Specs),
MaybeGoal = error2(Specs ++ SubGoalWarningSpecs)
)
else
Specs = get_any_errors1(MaybeParams) ++
get_any_errors_warnings3(MaybeSubGoals),
MaybeGoal = error2(Specs)
)
else
Spec = should_have_one_x_one_goal_prefix(ContextPieces, Context,
"a list of atomic parameters", "atomic"),
MaybeGoal = error2([Spec])
).
%---------------------%
:- pred parse_goal_promise_eqv_solns(
goal_kind::in(goal_kind_promise_eqv_soln),
list(term)::in, term.context::in, cord(format_piece)::in,
maybe2(goal, list(warning_spec))::out,
prog_varset::in, prog_varset::out) is det.
:- pragma inline(pred(parse_goal_promise_eqv_solns/7)).
parse_goal_promise_eqv_solns(GoalKind, ArgTerms, Context, ContextPieces,
MaybeGoal, !VarSet) :-
( if ArgTerms = [VarsTerm, SubGoalTerm] then
varset.coerce(!.VarSet, GenericVarSet),
parse_vars_state_dot_colon_vars(VarsTerm, GenericVarSet,
ContextPieces, MaybeVars),
parse_goal(SubGoalTerm, ContextPieces, MaybeSubGoal, !VarSet),
( if
MaybeVars = ok1(plain_state_dot_colon_vars(Vars0,
StateVars0, DotSVars0, ColonSVars0)),
MaybeSubGoal = ok2(SubGoal, SubGoalWarningSpecs)
then
list.map(term.coerce_var, Vars0, Vars),
list.map(term.coerce_var, StateVars0, StateVars),
list.map(term.coerce_var, DotSVars0, DotSVars),
list.map(term.coerce_var, ColonSVars0, ColonSVars),
(
GoalKind = gk_promise_eqv_solns,
Goal = promise_equivalent_solutions_expr(Context, Vars,
StateVars, DotSVars, ColonSVars, SubGoal),
MaybeGoal = ok2(Goal, SubGoalWarningSpecs)
;
GoalKind = gk_promise_eqv_soln_sets,
Goal = promise_equivalent_solution_sets_expr(Context, Vars,
StateVars, DotSVars, ColonSVars, SubGoal),
MaybeGoal = ok2(Goal, SubGoalWarningSpecs)
)
else
Specs = get_any_errors1(MaybeVars) ++
get_any_errors_warnings2(MaybeSubGoal),
MaybeGoal = error2(Specs)
)
else
string_goal_kind(Functor, GoalKind),
Spec = should_have_one_x_one_goal_prefix(ContextPieces, Context,
"a list of variables", Functor),
MaybeGoal = error2([Spec])
).
%---------------------%
:- pred parse_goal_arbitrary(list(term)::in,
term.context::in, cord(format_piece)::in,
maybe2(goal, list(warning_spec))::out,
prog_varset::in, prog_varset::out) is det.
:- pragma inline(pred(parse_goal_arbitrary/6)).
parse_goal_arbitrary(ArgTerms, Context, ContextPieces, MaybeGoal, !VarSet) :-
( if ArgTerms = [VarsTerm, SubGoalTerm] then
varset.coerce(!.VarSet, GenericVarSet),
parse_vars_state_dot_colon_vars(VarsTerm, GenericVarSet,
ContextPieces, MaybeVars),
parse_goal(SubGoalTerm, ContextPieces, MaybeSubGoal, !VarSet),
( if
MaybeVars = ok1(plain_state_dot_colon_vars(Vars0,
StateVars0, DotSVars0, ColonSVars0)),
MaybeSubGoal = ok2(SubGoal, SubGoalWarningSpecs)
then
list.map(term.coerce_var, Vars0, Vars),
list.map(term.coerce_var, StateVars0, StateVars),
list.map(term.coerce_var, DotSVars0, DotSVars),
list.map(term.coerce_var, ColonSVars0, ColonSVars),
Goal = promise_equivalent_solution_arbitrary_expr(Context,
Vars, StateVars, DotSVars, ColonSVars, SubGoal),
MaybeGoal = ok2(Goal, SubGoalWarningSpecs)
else
Specs = get_any_errors1(MaybeVars) ++
get_any_errors_warnings2(MaybeSubGoal),
MaybeGoal = error2(Specs)
)
else
Spec = should_have_one_x_one_goal_prefix(ContextPieces, Context,
"a list of variables", "arbitrary"),
MaybeGoal = error2([Spec])
).
%---------------------%
:- pred parse_goal_require_detism(goal_kind::in(goal_kind_require_detism),
list(term)::in, term.context::in, cord(format_piece)::in,
maybe2(goal, list(warning_spec))::out,
prog_varset::in, prog_varset::out) is det.
:- pragma inline(pred(parse_goal_require_detism/7)).
parse_goal_require_detism(GoalKind, ArgTerms, Context, ContextPieces,
MaybeGoal, !VarSet) :-
( GoalKind = gk_require_det, Detism = detism_det
; GoalKind = gk_require_semidet, Detism = detism_semi
; GoalKind = gk_require_multi, Detism = detism_multi
; GoalKind = gk_require_nondet, Detism = detism_non
; GoalKind = gk_require_cc_multi, Detism = detism_cc_multi
; GoalKind = gk_require_cc_nondet, Detism = detism_cc_non
; GoalKind = gk_require_erroneous, Detism = detism_erroneous
; GoalKind = gk_require_failure, Detism = detism_failure
),
( if ArgTerms = [SubGoalTerm] then
parse_goal(SubGoalTerm, ContextPieces, MaybeSubGoal, !VarSet),
(
MaybeSubGoal = ok2(SubGoal, SubGoalWarningSpecs),
Goal = require_detism_expr(Context, Detism, SubGoal),
MaybeGoal = ok2(Goal, SubGoalWarningSpecs)
;
MaybeSubGoal = error2(Specs),
MaybeGoal = error2(Specs)
)
else
string_goal_kind(Functor, GoalKind),
Spec = should_have_one_goal_prefix(ContextPieces, Context, Functor),
MaybeGoal = error2([Spec])
).
%---------------------%
:- pred parse_goal_require_complete_switch(list(term)::in,
term.context::in, cord(format_piece)::in,
maybe2(goal, list(warning_spec))::out,
prog_varset::in, prog_varset::out) is det.
:- pragma inline(pred(parse_goal_require_complete_switch/6)).
parse_goal_require_complete_switch(ArgTerms, Context, ContextPieces,
MaybeGoal, !VarSet) :-
( if ArgTerms = [VarsTerm, SubGoalTerm] then
term.coerce(VarsTerm, ProgVarsTerm),
parse_vars_state_dot_colon_vars(ProgVarsTerm, !.VarSet,
ContextPieces, MaybePSDCVars),
parse_goal(SubGoalTerm, ContextPieces, MaybeSubGoal, !VarSet),
( if
MaybePSDCVars = ok1(PSDCVars0),
MaybeSubGoal = ok2(SubGoal, SubGoalWarningSpecs)
then
parse_one_plain_or_dot_var(PSDCVars0, SubGoal,
ContextPieces, "require_complete_switch", MaybePODVar),
(
MaybePODVar = ok1(PODVar),
Goal = require_complete_switch_expr(Context, PODVar, SubGoal),
MaybeGoal = ok2(Goal, SubGoalWarningSpecs)
;
MaybePODVar = error1(RCSSpecs),
MaybeGoal = error2(RCSSpecs ++ SubGoalWarningSpecs)
)
else
Specs = get_any_errors1(MaybePSDCVars) ++
get_any_errors_warnings2(MaybeSubGoal),
MaybeGoal = error2(Specs)
)
else
Spec = should_have_one_x_one_goal_prefix(ContextPieces, Context,
"a variable in a singleton list", "require_complete_switch"),
MaybeGoal = error2([Spec])
).
%---------------------%
:- pred parse_goal_require_switch_arm_detism(
goal_kind::in(goal_kind_require_arm_detism),
list(term)::in, term.context::in, cord(format_piece)::in,
maybe2(goal, list(warning_spec))::out,
prog_varset::in, prog_varset::out) is det.
:- pragma inline(pred(parse_goal_require_switch_arm_detism/7)).
parse_goal_require_switch_arm_detism(GoalKind, ArgTerms,
Context, ContextPieces, MaybeGoal, !VarSet) :-
(
GoalKind = gk_require_arms_det,
Detism = detism_det,
Functor = "require_switch_arms_det"
;
GoalKind = gk_require_arms_semidet,
Detism = detism_semi,
Functor = "require_switch_arms_semidet"
;
GoalKind = gk_require_arms_multi,
Detism = detism_multi,
Functor = "require_switch_arms_multi"
;
GoalKind = gk_require_arms_nondet,
Detism = detism_non,
Functor = "require_switch_arms_nondet"
;
GoalKind = gk_require_arms_cc_multi,
Detism = detism_cc_multi,
Functor = "require_switch_arms_cc_multi"
;
GoalKind = gk_require_arms_cc_nondet,
Detism = detism_cc_non,
Functor = "require_switch_arms_cc_nondet"
;
GoalKind = gk_require_arms_erroneous,
Detism = detism_erroneous,
Functor = "require_switch_arms_erroneous"
;
GoalKind = gk_require_arms_failure,
Detism = detism_failure,
Functor = "require_switch_arms_failure"
),
( if ArgTerms = [VarsTerm, SubGoalTerm] then
term.coerce(VarsTerm, ProgVarsTerm),
parse_vars_state_dot_colon_vars(ProgVarsTerm, !.VarSet,
ContextPieces, MaybePSDCVars),
parse_goal(SubGoalTerm, ContextPieces, MaybeSubGoal, !VarSet),
( if
MaybePSDCVars = ok1(PSDCVars0),
MaybeSubGoal = ok2(SubGoal, SubGoalWarningSpecs)
then
parse_one_plain_or_dot_var(PSDCVars0, SubGoal,
ContextPieces, Functor, MaybePODVar),
(
MaybePODVar = ok1(PODVar),
Goal = require_switch_arms_detism_expr(Context, PODVar,
Detism, SubGoal),
MaybeGoal = ok2(Goal, SubGoalWarningSpecs)
;
MaybePODVar = error1(RCSSpecs),
MaybeGoal = error2(RCSSpecs ++ SubGoalWarningSpecs)
)
else
Specs = get_any_errors1(MaybePSDCVars) ++
get_any_errors_warnings2(MaybeSubGoal),
MaybeGoal = error2(Specs)
)
else
Spec = should_have_one_x_one_goal_prefix(ContextPieces, Context,
"a variable in a singleton list", Functor),
MaybeGoal = error2([Spec])
).
%---------------------%
:- pred parse_goal_event(list(term)::in,
term.context::in, cord(format_piece)::in,
maybe2(goal, list(warning_spec))::out,
prog_varset::in, prog_varset::out) is det.
:- pragma inline(pred(parse_goal_event/6)).
parse_goal_event(ArgTerms, Context, ContextPieces, MaybeGoal, !VarSet) :-
( if ArgTerms = [SubGoalTerm] then
parse_goal(SubGoalTerm, ContextPieces, MaybeSubGoal, !VarSet),
(
MaybeSubGoal = ok2(SubGoal, SubGoalWarningSpecs),
( if
SubGoal = call_expr(SubContext, SymName, CallArgs, Purity)
then
( if
SymName = unqualified(EventName),
Purity = purity_pure
then
Goal = event_expr(Context, EventName, CallArgs),
MaybeGoal = ok2(Goal, SubGoalWarningSpecs)
else
some [!Specs] (
!:Specs = [],
(
SymName = unqualified(_)
;
SymName = qualified(_, _),
QualPieces = cord.list(ContextPieces) ++
[lower_case_next_if_not_first,
words("Error: the")] ++
color_as_subject([words("event name")]) ++
color_as_incorrect(
[words("must not be qualified.")]) ++
[nl],
QualSpec = spec($pred, severity_error, phase_t2pt,
SubContext, QualPieces),
!:Specs = [QualSpec | !.Specs]
),
(
Purity = purity_pure
;
( Purity = purity_semipure
; Purity = purity_impure
),
PurityPieces = cord.list(ContextPieces) ++
[lower_case_next_if_not_first,
words("Error:")] ++
color_as_incorrect([words("an event cannot"),
words("be impure or semipure.")]) ++
[nl],
PuritySpec = spec($pred, severity_error,
phase_t2pt, SubContext, PurityPieces),
!:Specs = [PuritySpec | !.Specs]
),
MaybeGoal = error2(!.Specs ++ SubGoalWarningSpecs)
)
)
else
Spec = should_have_one_call_prefix(ContextPieces, Context,
"event"),
MaybeGoal = error2([Spec | SubGoalWarningSpecs])
)
;
MaybeSubGoal = error2(Specs),
MaybeGoal = error2(Specs)
)
else
Spec = should_have_one_call_prefix(ContextPieces, Context, "event"),
MaybeGoal = error2([Spec])
).
%---------------------%
:- pred parse_goal_true_fail(goal_kind::in(goal_kind_true_fail),
list(term)::in, term.context::in, cord(format_piece)::in,
maybe2(goal, list(warning_spec))::out) is det.
:- pragma inline(pred(parse_goal_true_fail/5)).
parse_goal_true_fail(GoalKind, ArgTerms, Context, ContextPieces, MaybeGoal) :-
(
GoalKind = gk_true,
Goal = true_expr(Context)
;
GoalKind = gk_fail,
Goal = fail_expr(Context)
),
(
ArgTerms = [],
MaybeGoal = ok2(Goal, [])
;
ArgTerms = [_ | _],
string_goal_kind(Functor, GoalKind),
Spec = should_have_no_args(ContextPieces, Context, Functor),
MaybeGoal = error2([Spec])
).
%---------------------%
:- pred parse_goal_equal(prog_varset::in, list(term)::in, term.context::in,
cord(format_piece)::in, maybe2(goal, list(warning_spec))::out) is det.
:- pragma inline(pred(parse_goal_equal/5)).
parse_goal_equal(VarSet, ArgTerms, Context, ContextPieces, MaybeGoal) :-
( if ArgTerms = [TermA0, TermB0] then
term.coerce(TermA0, TermA),
term.coerce(TermB0, TermB),
Goal = unify_expr(Context, TermA, TermB, purity_pure),
( if
TermA = functor(atom("^"), [TermAA, TermAB], Context),
TermAA = functor(atom("!"), [variable(Var, _)], _Context),
TermAB = functor(atom(FieldName), [], _)
then
VarName = mercury_var_to_string_vs(VarSet, print_name_only, Var),
string.format("!%s ^ %s", [s(VarName), s(FieldName)], ExprStr),
Pieces = [words("Warning: if the expression")] ++
color_as_subject([quote(ExprStr)]) ++
[words("is intended to be part of a field update,"),
words("then it should be followed by")] ++
color_as_correct([quote(":="), suffix(",")]) ++
[words("not")] ++
color_as_incorrect([quote("="), suffix(".")]) ++ [nl],
Severity = severity_warning(warn_dodgy_simple_code),
WarningSpec = spec($pred, Severity, phase_pt2h, Context, Pieces),
WarningSpecs = [WarningSpec]
else
WarningSpecs = []
),
MaybeGoal = ok2(Goal, WarningSpecs)
else
Spec = should_have_two_terms_infix(ContextPieces, Context, "="),
MaybeGoal = error2([Spec])
).
%---------------------------------------------------------------------------%
:- pred parse_one_plain_or_dot_var(
plain_state_dot_colon_vars(prog_var_type)::in, goal::in,
cord(format_piece)::in, string::in, maybe1(plain_or_dot_var)::out)
is det.
parse_one_plain_or_dot_var(PSDCVars, Goal, ContextPieces, ConstructName,
MaybePODVar) :-
PSDCVars = plain_state_dot_colon_vars(PlainVars, StateVars,
DotVars, ColonVars),
Context = get_goal_context(Goal),
(
StateVars = [],
MaybeStateVars = ok1(unit)
;
StateVars = [_ | _],
StatePieces = cord.list(ContextPieces) ++
[words("Error: the")] ++
color_as_subject([words("first argument of"),
words(ConstructName)]) ++
color_as_incorrect([words("may not contain")]) ++
[words("a state variable pair."), nl],
StateSpec = spec($pred, severity_error, phase_t2pt,
Context, StatePieces),
MaybeStateVars = error1([StateSpec])
),
(
ColonVars = [],
MaybeColonVars = ok1(unit)
;
ColonVars = [_ | _],
ColonPieces = cord.list(ContextPieces) ++
[words("Error: the")] ++
color_as_subject([words("first argument of"),
words(ConstructName)]) ++
color_as_incorrect([words("may not contain")]) ++
[words("a reference to the next value of a state variable."), nl],
ColonSpec = spec($pred, severity_error, phase_t2pt,
Context, ColonPieces),
MaybeColonVars = error1([ColonSpec])
),
(
(
PlainVars = [],
MaybeMaybePlainVar = ok1(no)
;
PlainVars = [PlainVar0],
MaybeMaybePlainVar = ok1(yes(PlainVar0))
)
;
PlainVars = [_, _ | _],
PlainPieces = cord.list(ContextPieces) ++
[words("Error: the")] ++
color_as_subject([words("first argument of"),
words(ConstructName)]) ++
color_as_incorrect([words("may not contain")]) ++
[words("more than one variable."), nl],
PlainSpec = spec($pred, severity_error, phase_t2pt,
Context, PlainPieces),
MaybeMaybePlainVar = error1([PlainSpec])
),
(
(
DotVars = [],
MaybeMaybeDotVar = ok1(no)
;
DotVars = [DotVar0],
MaybeMaybeDotVar = ok1(yes(DotVar0))
)
;
DotVars = [_, _ | _],
DotPieces = cord.list(ContextPieces) ++
[words("Error: the")] ++
color_as_subject([words("first argument of"),
words(ConstructName)]) ++
color_as_incorrect([words("may not contain")]) ++
[words("more than one variable."), nl],
DotSpec = spec($pred, severity_error, phase_t2pt,
Context, DotPieces),
MaybeMaybeDotVar = error1([DotSpec])
),
( if
MaybeStateVars = ok1(_),
MaybeColonVars = ok1(_),
MaybeMaybePlainVar = ok1(MaybePlainVar),
MaybeMaybeDotVar = ok1(MaybeDotVar)
then
(
MaybePlainVar = no,
MaybeDotVar = no,
Pieces = cord.list(ContextPieces) ++
[words("Error: the")] ++
color_as_subject([words("first argument of"),
words(ConstructName)]) ++
color_as_incorrect([words("must contain")]) ++
[words("a variable."), nl],
Spec = spec($pred, severity_error, phase_t2pt, Context, Pieces),
MaybePODVar = error1([Spec])
;
MaybePlainVar = yes(PlainVar),
MaybeDotVar = no,
MaybePODVar = ok1(podv_plain(PlainVar))
;
MaybePlainVar = no,
MaybeDotVar = yes(DotVar),
MaybePODVar = ok1(podv_dot(DotVar))
;
MaybePlainVar = yes(_),
MaybeDotVar = yes(_),
Pieces = cord.list(ContextPieces) ++
[words("Error: the")] ++
color_as_subject([words("first argument of"),
words(ConstructName)]) ++
color_as_incorrect([words("may not contain")]) ++
[words("more than one variable."), nl],
Spec = spec($pred, severity_error, phase_t2pt, Context, Pieces),
MaybePODVar = error1([Spec])
)
else
Specs =
get_any_errors1(MaybeStateVars) ++
get_any_errors1(MaybeColonVars) ++
get_any_errors1(MaybeMaybePlainVar) ++
get_any_errors1(MaybeMaybeDotVar),
MaybePODVar = error1(Specs)
).
%---------------------------------------------------------------------------%
:- pred parse_warnings(varset::in, term::in, string::in,
cord(format_piece)::in, int::in,
maybe2(list(goal_warning), list(warning_spec))::out) is det.
parse_warnings(VarSet, Term, ScopeFunctor, ContextPieces, WarningNum,
MaybeWarnings) :-
( if Term = term.functor(term.atom("[]"), [], _) then
MaybeWarnings = ok2([], [])
else if Term = term.functor(term.atom("[|]"), [HeadTerm, TailTerm], _) then
parse_warning(VarSet, HeadTerm, ScopeFunctor, ContextPieces,
WarningNum, HeadWarnings, HeadWarningSpecs),
parse_warnings(VarSet, TailTerm, ScopeFunctor, ContextPieces,
WarningNum + 1, MaybeTailWarnings),
(
MaybeTailWarnings = ok2(TailWarnings, TailWarningSpecs),
Warnings = HeadWarnings ++ TailWarnings,
WarningSpecs = HeadWarningSpecs ++ TailWarningSpecs,
MaybeWarnings = ok2(Warnings, WarningSpecs)
;
MaybeTailWarnings = error2(TailSpecs),
Specs = HeadWarningSpecs ++ TailSpecs,
MaybeWarnings = error2(Specs)
)
else
TermStr = describe_error_term(VarSet, Term),
Pieces = cord.list(ContextPieces) ++
[lower_case_next_if_not_first, words("Error: after the"),
quote(ScopeFunctor), words("keyword"), suffix(":"),
words("expected a")] ++
color_as_correct([words("list of warnings to disable,")]) ++
[words("got")] ++
color_as_incorrect([quote(TermStr), suffix(".")]) ++
[nl],
Spec = spec($pred, severity_error, phase_t2pt,
get_term_context(Term), Pieces),
MaybeWarnings = error2([Spec])
).
:- pred parse_warning(varset::in, term::in, string::in,
cord(format_piece)::in, int::in,
list(goal_warning)::out, list(warning_spec)::out) is det.
parse_warning(VarSet, Term, ScopeFunctor, ContextPieces, WarningNum,
Warnings, WarningSpecs) :-
( if
Term = term.functor(term.atom(WarningFunctor), [], _),
(
WarningFunctor = "non_tail_recursive_calls",
Warning = goal_warning_non_tail_recursive_calls
;
WarningFunctor = "suspected_occurs_check_failure",
Warning = goal_warning_occurs_check
;
WarningFunctor = "singleton_vars",
Warning = goal_warning_singleton_vars
;
WarningFunctor = "repeated_singleton_vars",
Warning = goal_warning_repeated_singleton_vars
;
WarningFunctor = "suspicious_recursion",
Warning = goal_warning_suspicious_recursion
;
WarningFunctor = "no_solution_disjunct",
Warning = goal_warning_no_solution_disjunct
;
WarningFunctor = "unknown_format_calls",
Warning = goal_warning_unknown_format_calls
)
then
Warnings = [Warning],
WarningSpecs = []
else
TermStr = describe_error_term(VarSet, Term),
Pieces = cord.list(ContextPieces) ++
[lower_case_next_if_not_first, words("Warning:"),
words("in the"), nth_fixed(WarningNum), words("element"),
words("of the list following the"), quote(ScopeFunctor),
words("keyword: expected the")] ++
color_as_correct([words("the name of a warning,")]) ++
[words("got")] ++
color_as_incorrect([quote(TermStr), suffix(",")]) ++
[nl],
% This is only a warning, not an error, to allow Mercury source files
% to include new warnings in disable_warning scopes, while still
% being able to be compiled with Mercury compiler versions from
% *before* the addition of the new warnings. See Mantis feature
% request #497.
Spec = spec($pred, severity_warning(warn_unknown_warning_name),
phase_t2pt, get_term_context(Term), Pieces),
Warnings = [],
WarningSpecs = [Spec]
).
:- pred generate_warnings_for_duplicate_warnings(prog_context::in,
cord(format_piece)::in, assoc_list(goal_warning, int)::in,
list(goal_warning)::out, list(error_spec)::out) is det.
generate_warnings_for_duplicate_warnings(_, _, [], [], []).
generate_warnings_for_duplicate_warnings(Context, ContextPieces,
[WarningCount | WarningsCounts], NonDupWarnings, DupSpecs) :-
generate_warnings_for_duplicate_warnings(Context, ContextPieces,
WarningsCounts, TailNonDupWarnings, TailDupSpecs),
WarningCount = Warning - Count,
( if Count > 1 then
WarningStr = goal_warning_to_string(Warning),
( if Count = 2 then
NTimesPieces = [words("twice")]
else
NTimesPieces = [int_fixed(Count), words("times")]
),
Pieces = cord.list(ContextPieces) ++
[lower_case_next_if_not_first, words("Error:"),
words("the warning")] ++
color_as_subject([fixed(WarningStr)]) ++
[words("is")] ++
color_as_incorrect([words("listed")] ++ NTimesPieces ++
[suffix(".")]) ++
[nl],
Spec = spec($pred, severity_error, phase_t2pt, Context, Pieces),
NonDupWarnings = TailNonDupWarnings,
DupSpecs = [Spec | TailDupSpecs]
else
NonDupWarnings = [Warning | TailNonDupWarnings],
DupSpecs = TailDupSpecs
).
%---------------------------------------------------------------------------%
:- type trace_component
---> trace_component_compiletime(trace_expr(trace_compiletime))
; trace_component_runtime(trace_expr(trace_runtime))
; trace_component_maybe_io(prog_var)
; trace_component_mutable_var(trace_mutable_var).
:- pred parse_trace_params(varset::in, context::in, term::in,
maybe1(assoc_list(trace_component, term.context))::out) is det.
parse_trace_params(VarSet, Context, Term, MaybeComponentsContexts) :-
( if Term = term.functor(term.atom("[]"), [], _) then
MaybeComponentsContexts = ok1([])
else if Term = term.functor(term.atom("[|]"), [HeadTerm, TailTerm], _) then
parse_trace_component(VarSet, Term, HeadTerm,
MaybeHeadComponentContext),
parse_trace_params(VarSet, Context, TailTerm,
MaybeTailComponentsContexts),
( if
MaybeHeadComponentContext = ok1(HeadComponentContext),
MaybeTailComponentsContexts = ok1(TailComponentsContexts)
then
MaybeComponentsContexts =
ok1([HeadComponentContext | TailComponentsContexts])
else
Specs = get_any_errors1(MaybeHeadComponentContext) ++
get_any_errors1(MaybeTailComponentsContexts),
MaybeComponentsContexts = error1(Specs)
)
else
TermStr = describe_error_term(VarSet, Term),
Pieces = [words("Error: expected a")] ++
color_as_correct([words("list of trace goal parameters,")]) ++
[words("got")] ++
color_as_incorrect([quote(TermStr), suffix(".")]) ++
[nl],
Spec = spec($pred, severity_error, phase_t2pt,
get_term_context(Term), Pieces),
MaybeComponentsContexts = error1([Spec])
).
:- pred parse_trace_component(varset::in, term::in, term::in,
maybe1(pair(trace_component, term.context))::out) is det.
parse_trace_component(VarSet, _ErrorTerm, Term, MaybeComponentContext) :-
( if
Term = term.functor(Functor, SubTerms, Context),
Functor = term.atom(Atom),
(
( Atom = "compiletime"
; Atom = "compile_time"
),
parse_trace_component_compiletime(VarSet, Atom, Context, SubTerms,
MaybeComponentContextPrime)
;
( Atom = "runtime"
; Atom = "run_time"
),
parse_trace_component_runtime(VarSet, Atom, Context, SubTerms,
MaybeComponentContextPrime)
;
Atom = "io",
parse_trace_component_io(Atom, Context, SubTerms,
MaybeComponentContextPrime)
;
Atom = "state",
parse_trace_component_state(Atom, Context, SubTerms,
MaybeComponentContextPrime)
)
then
MaybeComponentContext = MaybeComponentContextPrime
else
TermStr = describe_error_term(VarSet, Term),
Pieces = [words("Error: expected a")] ++
color_as_correct([words("trace goal parameter,")]) ++
[words("got")] ++
color_as_incorrect([quote(TermStr), suffix(".")]) ++
[nl],
Spec = spec($pred, severity_error, phase_t2pt,
get_term_context(Term), Pieces),
MaybeComponentContext = error1([Spec])
).
%---------------------%
:- pred parse_trace_component_compiletime(varset::in, string::in,
term_context::in, list(term)::in,
maybe1(pair(trace_component, term.context))::out) is det.
parse_trace_component_compiletime(VarSet, Atom, Context, SubTerms,
MaybeComponentContext) :-
( if SubTerms = [SubTerm] then
parse_trace_tree(parse_trace_compiletime(VarSet), SubTerm,
MaybeCompileTime),
(
MaybeCompileTime = ok1(CompileTime),
Component = trace_component_compiletime(CompileTime),
MaybeComponentContext = ok1(Component - Context)
;
MaybeCompileTime = error1(Specs),
MaybeComponentContext = error1(Specs)
)
else
Pieces = [words("Error:")] ++
color_as_subject([fixed(Atom)]) ++
color_as_subject([words("should have exactly one argument,")]) ++
[words("which should be a boolean expression"),
words("of compile-time tests."), nl],
Spec = spec($pred, severity_error, phase_t2pt, Context, Pieces),
MaybeComponentContext = error1([Spec])
).
:- pred parse_trace_component_runtime(varset::in, string::in,
term_context::in, list(term)::in,
maybe1(pair(trace_component, term.context))::out) is det.
parse_trace_component_runtime(VarSet, Atom, Context, SubTerms,
MaybeComponentContext) :-
( if SubTerms = [SubTerm] then
parse_trace_tree(parse_trace_runtime(VarSet), SubTerm, MaybeRunTime),
(
MaybeRunTime = ok1(RunTime),
Component = trace_component_runtime(RunTime),
MaybeComponentContext = ok1(Component - Context)
;
MaybeRunTime = error1(Specs),
MaybeComponentContext = error1(Specs)
)
else
Pieces = [words("Error:")] ++
color_as_subject([fixed(Atom)]) ++
color_as_incorrect([words("should have exactly one argument,")])++
[words("which should be a boolean expression"),
words("of run-time tests."), nl],
Spec = spec($pred, severity_error, phase_t2pt, Context, Pieces),
MaybeComponentContext = error1([Spec])
).
:- pred parse_trace_component_io(string::in, term_context::in,
list(term)::in, maybe1(pair(trace_component, term.context))::out) is det.
parse_trace_component_io(Atom, Context, SubTerms, MaybeComponentContext) :-
( if SubTerms = [SubTerm] then
( if
SubTerm = term.functor(term.atom("!"), [term.variable(Var, _)], _)
then
term.coerce_var(Var, ProgVar),
Component = trace_component_maybe_io(ProgVar),
MaybeComponentContext = ok1(Component - Context)
else
Pieces = [words("Error: the argument of")] ++
color_as_subject([fixed(Atom)]) ++
color_as_incorrect([words("should be a state variable.")]) ++
[nl],
Spec = spec($pred, severity_error, phase_t2pt,
get_term_context(SubTerm), Pieces),
MaybeComponentContext = error1([Spec])
)
else
Pieces = [words("Error:")] ++
color_as_subject([fixed(Atom)]) ++
color_as_incorrect([words("should have exactly one argument,")]) ++
[words("which should be a state variable name."), nl],
Spec = spec($pred, severity_error, phase_t2pt, Context, Pieces),
MaybeComponentContext = error1([Spec])
).
:- pred parse_trace_component_state(string::in, term_context::in,
list(term)::in, maybe1(pair(trace_component, term.context))::out) is det.
parse_trace_component_state(Atom, Context, SubTerms, MaybeComponentContext) :-
( if SubTerms = [SubTermA, SubTermB] then
( if
SubTermA = term.functor(term.atom(MutableName), [], _)
then
MaybeMutable = ok1(MutableName)
else
MutablePieces = [words("Error: the")] ++
color_as_subject([words("first argument of"), fixed(Atom)]) ++
color_as_incorrect([words("should be"),
words("the name of a mutable variable.")]) ++
[nl],
MutableSpec = spec($pred, severity_error, phase_t2pt,
get_term_context(SubTermA), MutablePieces),
MaybeMutable = error1([MutableSpec])
),
( if
SubTermB = term.functor(term.atom("!"),
[term.variable(Var, _)], _)
then
MaybeVar = ok1(Var)
else
VarPieces = [words("Error: the")] ++
color_as_subject([words("second argument of"), fixed(Atom)]) ++
color_as_incorrect([words("should be"),
words("a state variable name.")]) ++
[nl],
VarSpec = spec($pred, severity_error, phase_t2pt,
get_term_context(SubTermB), VarPieces),
MaybeVar = error1([VarSpec])
),
( if
MaybeMutable = ok1(FinalMutable),
MaybeVar = ok1(FinalVar)
then
term.coerce_var(FinalVar, ProgVar),
MutableVar = trace_mutable_var(FinalMutable, ProgVar),
Component = trace_component_mutable_var(MutableVar),
MaybeComponentContext = ok1(Component - Context)
else
Specs = get_any_errors1(MaybeVar) ++
get_any_errors1(MaybeMutable),
MaybeComponentContext = error1(Specs)
)
else
Pieces = [words("Error:")] ++
color_as_subject([fixed(Atom)]) ++
color_as_incorrect(
[words("should have exactly two arguments,")]) ++
[words("which should be"),
words("the name of a mutable variable"),
words("and a state variable name."), nl],
Spec = spec($pred, severity_error, phase_t2pt, Context, Pieces),
MaybeComponentContext = error1([Spec])
).
%---------------------%
:- pred parse_trace_tree(pred(term, maybe1(T))::in(pred(in, out) is det),
term::in, maybe1(trace_expr(T))::out) is det.
parse_trace_tree(BaseParser, Term, MaybeTree) :-
( if
Term = term.functor(term.atom(Atom), [LTerm, RTerm], _),
(
Atom = "or",
Op = trace_or
;
Atom = "and",
Op = trace_and
)
then
parse_trace_tree(BaseParser, LTerm, MaybeLExpr),
parse_trace_tree(BaseParser, RTerm, MaybeRExpr),
( if
MaybeLExpr = ok1(LExpr),
MaybeRExpr = ok1(RExpr)
then
MaybeTree = ok1(trace_op(Op, LExpr, RExpr))
else
Specs = get_any_errors1(MaybeLExpr) ++
get_any_errors1(MaybeRExpr),
MaybeTree = error1(Specs)
)
else if
Term = term.functor(term.atom("not"), [SubTerm], _)
then
parse_trace_tree(BaseParser, SubTerm, MaybeSubExpr),
( if
MaybeSubExpr = ok1(SubExpr)
then
MaybeTree = ok1(trace_not(SubExpr))
else
SubSpecs = get_any_errors1(MaybeSubExpr),
MaybeTree = error1(SubSpecs)
)
else
BaseParser(Term, MaybeBase),
(
MaybeBase = ok1(Base),
MaybeTree = ok1(trace_base(Base))
;
MaybeBase = error1(Specs),
MaybeTree = error1(Specs)
)
).
%---------------------%
:- pred parse_trace_compiletime(varset::in, term::in,
maybe1(trace_compiletime)::out) is det.
parse_trace_compiletime(VarSet, Term, MaybeCompiletime) :-
( if
Term = term.functor(Functor, SubTerms, TermContext),
Functor = term.atom(Atom),
(
Atom = "flag",
parse_trace_compiletime_flag(VarSet, TermContext, SubTerms,
MaybeCompiletimePrime)
;
Atom = "grade",
parse_trace_compiletime_grade(VarSet, TermContext, SubTerms,
MaybeCompiletimePrime)
;
( Atom = "tracelevel"
; Atom = "trace_level"
),
parse_trace_compiletime_trace_level(VarSet, Atom, TermContext,
SubTerms, MaybeCompiletimePrime)
)
then
MaybeCompiletime = MaybeCompiletimePrime
else
TermStr = describe_error_term(VarSet, Term),
Form1 = "flag(""name of --trace-flag parameter"")",
Form2 = "grade(<grade test>)",
Form3 = "tracelevel(shallow)",
Form4 = "tracelevel(deep)",
Pieces = [words("Error:")] ++
color_as_subject([quote(TermStr)]) ++
color_as_incorrect(
[words("is not a valid compile_time parameter.")]) ++
[words("The valid compile_time paramaters"),
words("have one of the following forms:"),
nl_indent_delta(1)] ++
color_as_correct([quote(Form1)]) ++ [nl] ++
color_as_correct([quote(Form2)]) ++ [nl] ++
color_as_correct([quote(Form3)]) ++ [nl] ++
color_as_correct([quote(Form4)]) ++
[nl_indent_delta(-1)],
Spec = spec($pred, severity_error, phase_t2pt,
get_term_context(Term), Pieces),
MaybeCompiletime = error1([Spec])
).
:- pred parse_trace_compiletime_flag(varset::in, term_context::in,
list(term)::in, maybe1(trace_compiletime)::out) is det.
parse_trace_compiletime_flag(VarSet, Context, SubTerms, MaybeCompiletime) :-
( if SubTerms = [SubTerm] then
( if SubTerm = term.functor(term.string(FlagName), [], _) then
Compiletime = trace_flag(FlagName),
MaybeCompiletime = ok1(Compiletime)
else
SubTermStr = describe_error_term(VarSet, SubTerm),
Pieces = [words("Error: expexted a")] ++
color_as_correct([words("string")]) ++
[words("as the argument of"), quote("flag"),
suffix(","), words("got")] ++
color_as_incorrect([quote(SubTermStr), suffix(".")]) ++
[nl],
Spec = spec($pred, severity_error, phase_t2pt, Context, Pieces),
MaybeCompiletime = error1([Spec])
)
else
Pieces = [words("Error: compile_time parameter")] ++
color_as_subject([quote("flag")]) ++
color_as_incorrect([words("should have just one argument.")]) ++
[nl],
Spec = spec($pred, severity_error, phase_t2pt, Context, Pieces),
MaybeCompiletime = error1([Spec])
).
:- pred parse_trace_compiletime_grade(varset::in, term_context::in,
list(term)::in, maybe1(trace_compiletime)::out) is det.
parse_trace_compiletime_grade(VarSet, Context, SubTerms, MaybeCompiletime) :-
( if SubTerms = [SubTerm] then
( if
SubTerm = term.functor(term.atom(GradeName), [], _),
parse_trace_grade_name(GradeName, TraceGrade)
then
Compiletime = trace_grade(TraceGrade),
MaybeCompiletime = ok1(Compiletime)
else
SubTermStr = describe_error_term(VarSet, SubTerm),
solutions(valid_trace_grade_name, ValidGradeNames),
Pieces = [words("Error:")] ++
color_as_subject([quote(SubTermStr)]) ++
color_as_incorrect([words("is not a valid grade test.")]) ++
[words("The valid grade tests are")] ++
fixed_list_to_color_pieces(color_correct, "and",
[suffix(".")], ValidGradeNames) ++
[nl],
Spec = spec($pred, severity_error, phase_t2pt, Context, Pieces),
MaybeCompiletime = error1([Spec])
)
else
Pieces = [words("Error: compile_time parameter"),
quote("grade"), words("takes just one argument."), nl],
Spec = spec($pred, severity_error, phase_t2pt, Context, Pieces),
MaybeCompiletime = error1([Spec])
).
:- pred parse_trace_compiletime_trace_level(varset::in, string::in,
term_context::in, list(term)::in, maybe1(trace_compiletime)::out) is det.
parse_trace_compiletime_trace_level(VarSet, Atom, Context, SubTerms,
MaybeCompiletime) :-
( if SubTerms = [SubTerm] then
( if
SubTerm = term.functor(term.atom(LevelName), [], _),
(
LevelName = "shallow",
Level = trace_level_shallow
;
LevelName = "deep",
Level = trace_level_deep
)
then
Compiletime = trace_trace_level(Level),
MaybeCompiletime = ok1(Compiletime)
else
SubTermStr = describe_error_term(VarSet, SubTerm),
Pieces = [words("Error:")] ++
color_as_incorrect([quote(SubTermStr)]) ++
color_as_incorrect([words("is not a valid trace level.")]) ++
[words("The valid trace levels are")] ++
color_as_correct([quote("shallow")]) ++
[words("and")] ++
color_as_correct([quote("deep"), suffix(".")]) ++
[nl],
Spec = spec($pred, severity_error, phase_t2pt, Context, Pieces),
MaybeCompiletime = error1([Spec])
)
else
Pieces = [words("Error: compile_time parameter")] ++
color_as_subject([quote(Atom)]) ++
color_as_incorrect(
[words("should have just one argument.")]) ++
[nl],
Spec = spec($pred, severity_error, phase_t2pt, Context, Pieces),
MaybeCompiletime = error1([Spec])
).
%---------------------%
:- pred parse_trace_runtime(varset::in, term::in,
maybe1(trace_runtime)::out) is det.
parse_trace_runtime(VarSet, Term, MaybeRuntime) :-
( if
Term = term.functor(Functor, SubTerms, Context),
Functor = term.atom(Atom),
Atom = "env",
parse_trace_runtime_env(VarSet, Context, SubTerms, MaybeRuntimePrime)
then
MaybeRuntime = MaybeRuntimePrime
else
TermStr = describe_error_term(VarSet, Term),
Pieces = [words("Error: expected a run_time parameter"),
words("of the form")] ++
color_as_correct(
[quote("env(""name of an environment variable"")"),
suffix(",")]) ++
[words("got")] ++
color_as_incorrect([quote(TermStr), suffix(".")]) ++
[nl],
Spec = spec($pred, severity_error, phase_t2pt,
get_term_context(Term), Pieces),
MaybeRuntime = error1([Spec])
).
:- pred parse_trace_runtime_env(varset::in, term_context::in, list(term)::in,
maybe1(trace_runtime)::out) is det.
parse_trace_runtime_env(VarSet, Context, SubTerms, MaybeRuntime) :-
( if SubTerms = [SubTerm] then
( if
SubTerm = term.functor(SubFunctor, [], _),
( SubFunctor = term.string(EnvVarName)
; SubFunctor = term.atom(EnvVarName)
),
EnvVarChars = string.to_char_list(EnvVarName),
list.filter(env_var_is_acceptable_char, EnvVarChars, _, [])
then
Runtime = trace_envvar(EnvVarName),
MaybeRuntime = ok1(Runtime)
else
SubTermStr = describe_error_term(VarSet, SubTerm),
Pieces = [words("Error: expected an")] ++
color_as_correct([words("identifier")]) ++
[words("as the argument of the run_time parameter"),
quote("env"), suffix(","), words("got")] ++
color_as_incorrect([quote(SubTermStr), suffix(".")]) ++
[nl],
Spec = spec($pred, severity_error, phase_t2pt,
get_term_context(SubTerm), Pieces),
MaybeRuntime = error1([Spec])
)
else
Pieces = [words("Error: run_time parameter"),
quote("env"), words("takes just one argument."), nl],
Spec = spec($pred, severity_error, phase_t2pt, Context, Pieces),
MaybeRuntime = error1([Spec])
).
:- pred env_var_is_acceptable_char(char::in) is semidet.
env_var_is_acceptable_char(Char) :-
% This definition must be consistent with the check applied in
% util/mkinit.c.
( char.is_alnum(Char)
; Char = '_'
).
%---------------------%
:- pred convert_trace_params(assoc_list(trace_component, term.context)::in,
maybe4(maybe(trace_expr(trace_compiletime)),
maybe(trace_expr(trace_runtime)), maybe(prog_var),
list(trace_mutable_var))::out) is det.
convert_trace_params(Components, MaybeParams) :-
collect_trace_params(Components, no, MaybeCompileTime, no, MaybeRunTime,
no, MaybeIO, [], MutableVars, [], Specs),
(
Specs = [],
MaybeParams = ok4(MaybeCompileTime, MaybeRunTime, MaybeIO, MutableVars)
;
Specs = [_ | _],
MaybeParams = error4(Specs)
).
:- pred collect_trace_params(assoc_list(trace_component, term.context)::in,
maybe(trace_expr(trace_compiletime))::in,
maybe(trace_expr(trace_compiletime))::out,
maybe(trace_expr(trace_runtime))::in,
maybe(trace_expr(trace_runtime))::out,
maybe(prog_var)::in, maybe(prog_var)::out,
list(trace_mutable_var)::in, list(trace_mutable_var)::out,
list(error_spec)::in, list(error_spec)::out) is det.
collect_trace_params([], !MaybeCompileTime, !MaybeRunTime, !MaybeIO,
!MutableVars, !Specs).
collect_trace_params([Component - Context | ComponentsContexts],
!MaybeCompileTime, !MaybeRunTime, !MaybeIO, !MutableVars, !Specs) :-
(
Component = trace_component_compiletime(CompileTime),
(
!.MaybeCompileTime = no,
!:MaybeCompileTime = yes(CompileTime)
;
!.MaybeCompileTime = yes(_),
Pieces = [words("Error:")] ++
color_as_incorrect(
[words("duplicate compile_time parameter")]) ++
[words("in trace goal."), nl],
Spec = spec($pred, severity_error, phase_t2pt, Context, Pieces),
!:Specs = [Spec | !.Specs]
)
;
Component = trace_component_runtime(RunTime),
(
!.MaybeRunTime = no,
!:MaybeRunTime = yes(RunTime)
;
!.MaybeRunTime = yes(_),
Pieces = [words("Error:")] ++
color_as_incorrect([words("duplicate run_time parameter")]) ++
[words("in trace goal."), nl],
Spec = spec($pred, severity_error, phase_t2pt, Context, Pieces),
!:Specs = [Spec | !.Specs]
)
;
Component = trace_component_maybe_io(IOStateVar),
(
!.MaybeIO = no,
!:MaybeIO = yes(IOStateVar)
;
!.MaybeIO = yes(_),
Pieces = [words("Error:")] ++
color_as_incorrect([words("duplicate io parameter")]) ++
[words("in trace goal."), nl],
Spec = spec($pred, severity_error, phase_t2pt, Context, Pieces),
!:Specs = [Spec | !.Specs]
)
;
Component = trace_component_mutable_var(MutableVar),
!:MutableVars = !.MutableVars ++ [MutableVar]
),
collect_trace_params(ComponentsContexts, !MaybeCompileTime, !MaybeRunTime,
!MaybeIO, !MutableVars, !Specs).
%---------------------------------------------------------------------------%
:- pred parse_catch_any_term(term::in, term.context::in,
cord(format_piece)::in,
maybe2(catch_any_expr, list(warning_spec))::out,
prog_varset::in, prog_varset::out) is det.
parse_catch_any_term(ArrowTerm, _Context, ContextPieces, MaybeCatchAny,
!VarSet) :-
( if ArrowTerm = term.functor(atom("->"), [VarTerm0, GoalTerm], _) then
( if VarTerm0 = term.variable(Var0, _) then
term.coerce_var(Var0, Var),
parse_goal(GoalTerm, ContextPieces, MaybeGoal, !VarSet),
(
MaybeGoal = ok2(Goal, GoalWarningSpecs),
CatchAny = catch_any_expr(Var, Goal),
MaybeCatchAny = ok2(CatchAny, GoalWarningSpecs)
;
MaybeGoal = error2(Specs),
MaybeCatchAny = error2(Specs)
)
else
varset.coerce(!.VarSet, VarSet0),
VarTermStr0 = describe_error_term(VarSet0, VarTerm0),
Pieces = [words("Error: expected a")] ++
color_as_correct([words("variable")]) ++
[words("as the left operand of the"),
quote("->"), words("operator inside the scope"),
words("of a"), quote("catch_any"), words("operator, got")] ++
color_as_incorrect([quote(VarTermStr0), suffix(".")]) ++
[nl],
Spec = spec($pred, severity_error, phase_t2pt,
get_term_context(ArrowTerm), Pieces),
MaybeCatchAny = error2([Spec])
)
else
varset.coerce(!.VarSet, VarSet0),
ArrowTermStr = describe_error_term(VarSet0, ArrowTerm),
Pieces = [words("Error: expected an expression of the form")] ++
color_as_correct([quote("variable -> goal")]) ++
[words("following the "), quote("catch_any"), words("operator,"),
words("got")] ++
color_as_incorrect([quote(ArrowTermStr), suffix(".")]) ++
[nl],
Spec = spec($pred, severity_error, phase_t2pt,
get_term_context(ArrowTerm), Pieces),
MaybeCatchAny = error2([Spec])
).
:- pred parse_catch_then_try_term_args(list(term)::in,
maybe(catch_any_expr)::in, term.context::in, cord(format_piece)::in,
maybe2(goal, list(warning_spec))::out,
prog_varset::in, prog_varset::out) is det.
parse_catch_then_try_term_args(CatchTermArgs, MaybeCatchAnyExpr,
Context, ContextPieces, MaybeGoal, !VarSet) :-
( if CatchTermArgs = [TermA, TermB] then
parse_sub_catch_terms(TermB, Context, ContextPieces, MaybeCatches,
!VarSet),
(
MaybeCatches = ok2(Catches, CatchWarningSpecs),
parse_else_then_try_term(TermA, Catches, MaybeCatchAnyExpr,
Context, ContextPieces, MaybeGoal0, !VarSet),
(
MaybeGoal0 = ok2(Goal, GoalWarningSpecs),
MaybeGoal = ok2(Goal, CatchWarningSpecs ++ GoalWarningSpecs)
;
MaybeGoal0 = error2(Specs),
MaybeGoal = error2(CatchWarningSpecs ++ Specs)
)
;
MaybeCatches = error2(Specs),
MaybeGoal = error2(Specs)
)
else
varset.coerce(!.VarSet, ErrorVarSet),
ErrorTerm = term.functor(atom("catch"), CatchTermArgs, dummy_context),
ErrorTermStr = describe_error_term(ErrorVarSet, ErrorTerm),
Pieces = [words("Error: the"), quote("catch"), words("operator")] ++
color_as_correct([words("should be preceded")]) ++
[words("by a try expression of the form"),
quote("try [try_params] main_goal then else_goal"), suffix(","),
words("and")] ++
color_as_correct([words("followed")]) ++
[words("by an expression of the form"),
quote("catch_pattern -> catch_goal"), suffix(","), words("but")] ++
color_as_subject([quote(ErrorTermStr)]) ++
color_as_incorrect([words("does not have this form.")]) ++
[nl],
Spec = spec($pred, severity_error, phase_t2pt, Context, Pieces),
MaybeGoal = error2([Spec])
).
:- pred parse_sub_catch_terms(term::in, term.context::in,
cord(format_piece)::in,
maybe2(list(catch_expr), list(warning_spec))::out,
prog_varset::in, prog_varset::out) is det.
parse_sub_catch_terms(Term, Context, ContextPieces, MaybeCatches, !VarSet) :-
( if Term = functor(atom("catch"), [CatchArrowTerm, SubTerm], _) then
parse_catch_arrow_term(CatchArrowTerm, Context, ContextPieces,
HeadMaybeCatch, !VarSet),
parse_sub_catch_terms(SubTerm, Context, ContextPieces,
TailMaybeCatches, !VarSet),
( if
HeadMaybeCatch = ok2(HeadCatch, HeadWarningSpecs),
TailMaybeCatches = ok2(TailCatches, TailWarningSpecs)
then
Catches = [HeadCatch | TailCatches],
WarningSpecs = HeadWarningSpecs ++ TailWarningSpecs,
MaybeCatches = ok2(Catches, WarningSpecs)
else
Specs = get_any_errors_warnings2(HeadMaybeCatch) ++
get_any_errors_warnings2(TailMaybeCatches),
MaybeCatches = error2(Specs)
)
else
parse_catch_arrow_term(Term, Context, ContextPieces, MaybeCatch,
!VarSet),
(
MaybeCatch = ok2(Catch, CatchWarningSpecs),
MaybeCatches = ok2([Catch], CatchWarningSpecs)
;
MaybeCatch = error2(Error),
MaybeCatches = error2(Error)
)
).
:- pred parse_catch_arrow_term(term::in, term.context::in,
cord(format_piece)::in, maybe2(catch_expr, list(warning_spec))::out,
prog_varset::in, prog_varset::out) is det.
parse_catch_arrow_term(ArrowTerm, _Context, ContextPieces, MaybeCatch,
!VarSet) :-
( if ArrowTerm = term.functor(atom("->"), [PatternTerm0, GoalTerm], _) then
term.coerce(PatternTerm0, PatternTerm),
parse_goal(GoalTerm, ContextPieces, MaybeGoal, !VarSet),
(
MaybeGoal = ok2(Goal, GoalWarningSpecs),
Catch = catch_expr(PatternTerm, Goal),
MaybeCatch = ok2(Catch, GoalWarningSpecs)
;
MaybeGoal = error2(Error),
MaybeCatch = error2(Error)
)
else
varset.coerce(!.VarSet, ErrorVarSet),
ArrowTermStr = describe_error_term(ErrorVarSet, ArrowTerm),
Pieces = [words("Error: expected an expression of the form")] ++
color_as_correct([quote("catch_pattern -> catch_goal")]) ++
[words("following the"), quote("catch"), words("operator,"),
words("got")] ++
color_as_incorrect([quote(ArrowTermStr), suffix(".")]) ++
[nl],
Spec = spec($pred, severity_error, phase_t2pt,
get_term_context(ArrowTerm), Pieces),
MaybeCatch = error2([Spec])
).
:- pred parse_else_then_try_term(term::in, list(catch_expr)::in,
maybe(catch_any_expr)::in, term.context::in, cord(format_piece)::in,
maybe2(goal, list(warning_spec))::out,
prog_varset::in, prog_varset::out) is det.
parse_else_then_try_term(Term, CatchExprs, MaybeCatchAnyExpr,
Context, ContextPieces, MaybeGoal, !VarSet) :-
% `else' part may or may not exist in `try' goals.
( if Term = term.functor(term.atom("else"), [ThenTerm, ElseTerm], _) then
parse_goal(ElseTerm, ContextPieces, MaybeElseGoal0, !VarSet),
(
MaybeElseGoal0 = ok2(ElseGoal, ElseWarningSpecs),
parse_then_try_term(ThenTerm, yes(ElseGoal), CatchExprs,
MaybeCatchAnyExpr, Context, ContextPieces, MaybeTryGoal,
!VarSet),
( if
MaybeTryGoal = error2(_),
ThenTerm = term.functor(term.atom("then"), [_, _], ThenContext)
then
Pieces = [words("Error: malformed if-then-else;")] ++
color_as_incorrect([words("this"), quote("then"),
words("is missing its"), quote("if"), suffix(".")]) ++
[nl],
Spec = spec($pred, severity_error, phase_t2pt,
ThenContext, Pieces),
MaybeGoal = error2([Spec | ElseWarningSpecs])
else
MaybeGoal = MaybeTryGoal
)
;
MaybeElseGoal0 = error2(Specs),
MaybeGoal = error2(Specs)
)
else
parse_then_try_term(Term, no, CatchExprs, MaybeCatchAnyExpr,
Context, ContextPieces, MaybeGoal, !VarSet)
).
:- pred parse_then_try_term(term::in, maybe(goal)::in, list(catch_expr)::in,
maybe(catch_any_expr)::in, term.context::in, cord(format_piece)::in,
maybe2(goal, list(warning_spec))::out,
prog_varset::in, prog_varset::out) is det.
parse_then_try_term(ThenTryTerm, MaybeElse, CatchExprs, MaybeCatchAnyExpr,
Context, ContextPieces, MaybeGoal, !VarSet) :-
( if
ThenTryTerm = term.functor(term.atom("then"), [TryTerm, ThenTerm], _),
TryTerm = term.functor(term.atom("try"), [ParamsTerm, TryGoalTerm],
TryContext)
then
varset.coerce(!.VarSet, GenericVarSet),
parse_try_params(GenericVarSet, Context, ParamsTerm, MaybeParams),
parse_goal(TryGoalTerm, ContextPieces, MaybeTryGoal, !VarSet),
parse_goal(ThenTerm, ContextPieces, MaybeThenGoal, !VarSet),
( if
MaybeParams = ok1(Params),
MaybeTryGoal = ok2(TryGoal, TryWarningSpecs),
MaybeThenGoal = ok2(ThenGoal, ThenWarningSpecs)
then
WarningSpecs = TryWarningSpecs ++ ThenWarningSpecs,
convert_try_params(Params, MaybeComponents),
(
MaybeComponents = ok1(MaybeIO),
Goal = try_expr(TryContext, MaybeIO, TryGoal, ThenGoal,
MaybeElse, CatchExprs, MaybeCatchAnyExpr),
MaybeGoal = ok2(Goal, WarningSpecs)
;
MaybeComponents = error1(Specs),
MaybeGoal = error2(Specs ++ WarningSpecs)
)
else
Specs = get_any_errors1(MaybeParams) ++
get_any_errors_warnings2(MaybeTryGoal) ++
get_any_errors_warnings2(MaybeThenGoal),
MaybeGoal = error2(Specs)
)
else
Pieces = [words("Error: a")] ++
color_as_subject([quote("try"), words("goal")]) ++
color_as_incorrect([words("should have the form")]) ++
[quote("try [try_params] main_goal then success_goal"),
suffix(","),
words("optionally followed by"),
quote("else failure_goal"), suffix(","),
words("which in turn may be followed by zero or more"),
quote("catch"), words("clauses, and optionally by a single"),
quote("catch_any"), words("clause."), nl],
Spec = spec($pred, severity_error, phase_t2pt,
get_term_context(ThenTryTerm), Pieces),
MaybeGoal = error2([Spec])
).
:- type try_component
---> try_component_maybe_io(prog_var).
:- pred parse_try_params(varset::in, context::in, term::in,
maybe1(assoc_list(try_component, term.context))::out) is det.
parse_try_params(VarSet, Context, Term, MaybeComponentsContexts) :-
( if Term = term.functor(term.atom("[]"), [], _) then
MaybeComponentsContexts = ok1([])
else if Term = term.functor(term.atom("[|]"), [HeadTerm, TailTerm], _) then
parse_try_param(VarSet, Term, HeadTerm,
MaybeHeadComponentContext),
parse_try_params(VarSet, Context, TailTerm,
MaybeTailComponentsContexts),
( if
MaybeHeadComponentContext = ok1(HeadComponentContext),
MaybeTailComponentsContexts = ok1(TailComponentsContexts)
then
MaybeComponentsContexts =
ok1([HeadComponentContext | TailComponentsContexts])
else
Specs = get_any_errors1(MaybeHeadComponentContext) ++
get_any_errors1(MaybeTailComponentsContexts),
MaybeComponentsContexts = error1(Specs)
)
else
TermStr = describe_error_term(VarSet, Term),
Pieces = [words("Error: expected a")] ++
color_as_correct([words("list of try parameters,")]) ++
[words("got")] ++
color_as_incorrect([quote(TermStr), suffix(".")]) ++
[nl],
Spec = spec($pred, severity_error, phase_t2pt,
get_term_context(Term), Pieces),
MaybeComponentsContexts = error1([Spec])
).
:- pred parse_try_param(varset::in, term::in, term::in,
maybe1(pair(try_component, term.context))::out) is det.
parse_try_param(VarSet, _ErrorTerm, Term, MaybeComponentContext) :-
( if
Term = term.functor(Functor, SubTerms, Context),
Functor = term.atom(Atom)
then
( if Atom = "io" then
( if SubTerms = [SubTerm] then
( if
SubTerm = term.functor(term.atom("!"),
[term.variable(Var, _)], _)
then
term.coerce_var(Var, ProgVar),
Component = try_component_maybe_io(ProgVar),
MaybeComponentContext = ok1(Component - Context)
else
SubTermStr = describe_error_term(VarSet, SubTerm),
Pieces = [words("Error: expected a")] ++
color_as_correct([words("state variable")]) ++
[words("as the argument of"), quote(Atom), suffix(","),
words("got")] ++
color_as_incorrect([quote(SubTermStr), suffix(".")]) ++
[nl],
Spec = spec($pred, severity_error, phase_t2pt,
get_term_context(SubTerm), Pieces),
MaybeComponentContext = error1([Spec])
)
else
Pieces = [words("Error:")] ++
color_as_subject([fixed(Atom)]) ++
color_as_incorrect([words("should have one argument,")]) ++
[words("which should be a state variable name."), nl],
Spec = spec($pred, severity_error, phase_t2pt,
Context, Pieces),
MaybeComponentContext = error1([Spec])
)
else
TermStr = describe_error_term(VarSet, Term),
Pieces = [words("Error: expected a term of the form")] ++
color_as_correct([quote("io(!IO)")]) ++
[words("as try goal parameter, got")] ++
color_as_incorrect([quote(TermStr), suffix(".")]) ++
[nl],
Spec = spec($pred, severity_error, phase_t2pt, Context, Pieces),
MaybeComponentContext = error1([Spec])
)
else
TermStr = describe_error_term(VarSet, Term),
Pieces = [words("Error: expected a term of the form")] ++
color_as_correct([quote("io(!IO)")]) ++
[words("as try goal parameter, got")] ++
color_as_incorrect([quote(TermStr), suffix(".")]) ++
[nl],
Spec = spec($pred, severity_error, phase_t2pt,
get_term_context(Term), Pieces),
MaybeComponentContext = error1([Spec])
).
:- pred convert_try_params(assoc_list(try_component, term.context)::in,
maybe1(maybe(prog_var))::out) is det.
convert_try_params(Components, MaybeParams) :-
collect_try_params(Components, no, MaybeIO, [], Specs),
(
Specs = [],
MaybeParams = ok1(MaybeIO)
;
Specs = [_ | _],
MaybeParams = error1(Specs)
).
:- pred collect_try_params(assoc_list(try_component, term.context)::in,
maybe(prog_var)::in, maybe(prog_var)::out,
list(error_spec)::in, list(error_spec)::out) is det.
collect_try_params([], !MaybeIO, !Specs).
collect_try_params([Component - Context | ComponentsContexts],
!MaybeIO, !Specs) :-
Component = try_component_maybe_io(IOStateVar),
(
!.MaybeIO = no,
!:MaybeIO = yes(IOStateVar)
;
!.MaybeIO = yes(_),
Pieces = [words("Error:")] ++
color_as_incorrect([words("duplicate io parameter")]) ++
[words("in try goal."), nl],
Spec = spec($pred, severity_error, phase_t2pt, Context, Pieces),
!:Specs = [Spec | !.Specs]
),
collect_try_params(ComponentsContexts, !MaybeIO, !Specs).
%---------------------------------------------------------------------------%
:- type atomic_component
---> atomic_component_inner(atomic_component_state)
; atomic_component_outer(atomic_component_state)
; atomic_component_vars(list(prog_var)).
:- pred parse_atomic_params(context::in, term::in, varset::in,
maybe1(assoc_list(atomic_component, term.context))::out) is det.
parse_atomic_params(Context, Term, VarSet, MaybeComponentsContexts) :-
( if Term = term.functor(term.atom("[]"), [], _) then
MaybeComponentsContexts = ok1([])
else if Term = term.functor(term.atom("[|]"), [HeadTerm, TailTerm], _) then
parse_atomic_component(Term, HeadTerm, VarSet, MaybeHeadComponent),
parse_atomic_params(Context, TailTerm, VarSet,
MaybeTailComponentsContexts),
( if
MaybeHeadComponent = ok1(HeadComponent),
MaybeTailComponentsContexts = ok1(TailComponentsContexts)
then
MaybeComponentsContexts =
ok1([HeadComponent | TailComponentsContexts])
else
Specs = get_any_errors1(MaybeHeadComponent) ++
get_any_errors1(MaybeTailComponentsContexts),
MaybeComponentsContexts = error1(Specs)
)
else
TermStr = describe_error_term(VarSet, Term),
Pieces = [words("Error: expected a")] ++
color_as_correct([words("a list of atomic goal parameters,")]) ++
[words("got")] ++
color_as_incorrect([quote(TermStr), suffix(".")]) ++
[nl],
Spec = spec($pred, severity_error, phase_t2pt,
get_term_context(Term), Pieces),
MaybeComponentsContexts = error1([Spec])
).
:- pred parse_atomic_component(term::in, term::in, varset::in,
maybe1(pair(atomic_component, term.context))::out) is det.
parse_atomic_component(ErrorTerm, Term, VarSet, MaybeComponentContext) :-
(
Term = term.functor(Functor, SubTerms, Context),
( if Functor = term.atom(Atom) then
% XXX Make parse_atomic_subterm do the postprocessing done here.
( if Atom = "outer" then
parse_atomic_subterm(VarSet, Atom, ErrorTerm, Term,
MaybeComponentSubTerm),
(
MaybeComponentSubTerm = ok1(CompTerm),
Component = atomic_component_outer(CompTerm),
MaybeComponentContext = ok1(Component - Context)
;
MaybeComponentSubTerm = error1(Specs),
MaybeComponentContext = error1(Specs)
)
else if Atom = "inner" then
parse_atomic_subterm(VarSet, Atom, ErrorTerm, Term,
MaybeComponentSubTerm),
(
MaybeComponentSubTerm = ok1(CompTerm),
Component = atomic_component_inner(CompTerm),
MaybeComponentContext = ok1(Component - Context)
;
MaybeComponentSubTerm = error1(Specs),
MaybeComponentContext = error1(Specs)
)
else if Atom = "vars" then
( if SubTerms = [SubTerm] then
ContextPieces = cord.from_list([words("In"), quote("vars"),
words("specifier of atomic scope:")]),
parse_possibly_repeated_vars(SubTerm, VarSet,
ContextPieces, MaybeVars),
(
MaybeVars = ok1(Vars),
list.map(term.coerce_var, Vars, ProgVars),
Component = atomic_component_vars(ProgVars),
MaybeComponentContext = ok1(Component - Context)
;
MaybeVars = error1(Specs),
MaybeComponentContext = error1(Specs)
)
else
Pieces = [words("Error:"), words(Atom)] ++
color_as_incorrect(
[words("should have exact one argument,")]) ++
[words("which should be a list of variable names."),
nl],
Spec = spec($pred, severity_error, phase_t2pt,
Context, Pieces),
MaybeComponentContext = error1([Spec])
)
else
Pieces = [words("Invalid atomic goal parameter."), nl],
Spec = spec($pred, severity_error, phase_t2pt,
Context, Pieces),
MaybeComponentContext = error1([Spec])
)
else
TermStr = describe_error_term(VarSet, Term),
Pieces = [words("Error: expected an")] ++
color_as_correct([words("atomic goal parameter,")]) ++
[words("got")] ++
color_as_incorrect([quote(TermStr), suffix(".")]) ++
[nl],
Spec = spec($pred, severity_error, phase_t2pt, Context, Pieces),
MaybeComponentContext = error1([Spec])
)
;
Term = term.variable(_, _Context),
TermStr = describe_error_term(VarSet, Term),
Pieces = [words("Error: expected an")] ++
color_as_correct([words("atomic goal parameter,")]) ++
[words("got")] ++
color_as_incorrect([quote(TermStr), suffix(".")]) ++
[nl],
Spec = spec($pred, severity_error, phase_t2pt,
get_term_context(Term), Pieces),
MaybeComponentContext = error1([Spec])
).
:- pred parse_atomic_subterm(varset::in, string::in, term::in, term::in,
maybe1(atomic_component_state)::out) is det.
parse_atomic_subterm(VarSet, Name, ErrorTerm, Term, MaybeComponentState) :-
(
Term = term.functor(_, SubTerms, TermContext),
( if
parse_atomic_component_state_or_pair(SubTerms, ComponentState)
then
MaybeComponentState = ok1(ComponentState)
else
Pieces = [words("Error:")] ++
color_as_subject([words(Name)]) ++
color_as_incorrect(
[words("should have exactly one argument,")]) ++
[words("which should be a state variable"),
words("or a pair of variables."), nl],
Spec = spec($pred, severity_error, phase_t2pt,
TermContext, Pieces),
MaybeComponentState = error1([Spec])
)
;
Term = term.variable(_, _TermContext),
TermStr = describe_error_term(VarSet, Term),
Pieces = [words("Error: expected an")] ++
color_as_correct([words("atomic goal parameter,")]) ++
[words("got")] ++
color_as_incorrect([quote(TermStr), suffix(".")]) ++
[nl],
Spec = spec($pred, severity_error, phase_t2pt,
get_term_context(ErrorTerm), Pieces),
MaybeComponentState = error1([Spec])
).
:- pred parse_atomic_component_state_or_pair(list(term)::in,
atomic_component_state::out) is semidet.
parse_atomic_component_state_or_pair(SubTerms, State) :-
( if
SubTerms = [Term],
Term = term.functor(term.atom("!"), [term.variable(Var, _)], _)
then
term.coerce_var(Var, ProgVar),
State = atomic_state_var(ProgVar)
else if
SubTerms = [TermA, TermB],
TermA = term.variable(VarA, _),
TermB = term.variable(VarB, _)
then
term.coerce_var(VarA, ProgVarA),
term.coerce_var(VarB, ProgVarB),
State = atomic_var_pair(ProgVarA, ProgVarB)
else
fail
).
%---------------------%
:- pred parse_atomic_subgoals(term::in,
maybe3(goal, list(goal), list(warning_spec))::out,
prog_varset::in, prog_varset::out) is det.
parse_atomic_subgoals(Term, MaybeOoMSubGoals, !VarSet) :-
parse_atomic_subgoals_as_list(Term, MaybeSubGoals, !VarSet),
(
MaybeSubGoals = ok2(Goals, WarningSpecs),
(
Goals = [],
Pieces = [words("Error: atomic scope")] ++
color_as_incorrect([words("must have a goal.")]) ++
[nl],
Context = get_term_context(Term),
Spec = spec($pred, severity_error, phase_t2pt, Context, Pieces),
MaybeOoMSubGoals = error3([Spec | WarningSpecs])
;
Goals = [MainSubGoal | OrElseSubGoals],
MaybeOoMSubGoals = ok3(MainSubGoal, OrElseSubGoals, WarningSpecs)
)
;
MaybeSubGoals = error2(Specs),
MaybeOoMSubGoals = error3(Specs)
).
:- pred parse_atomic_subgoals_as_list(term::in,
maybe2(list(goal), list(warning_spec))::out,
prog_varset::in, prog_varset::out) is det.
parse_atomic_subgoals_as_list(Term, MaybeGoals, !VarSet) :-
( if
Term = term.functor(term.atom("or_else"), [LeftGoal, RightGoal], _)
then
parse_atomic_subgoals_as_list(LeftGoal, MaybeLeftGoalList, !VarSet),
parse_atomic_subgoals_as_list(RightGoal, MaybeRightGoalList, !VarSet),
( if
MaybeLeftGoalList = ok2(LeftGoalList, LeftWarningSpecs),
MaybeRightGoalList = ok2(RightGoalList, RightWarningSpecs)
then
Goals = LeftGoalList ++ RightGoalList,
WarningSpecs = LeftWarningSpecs ++ RightWarningSpecs,
MaybeGoals = ok2(Goals, WarningSpecs)
else
Specs = get_any_errors_warnings2(MaybeLeftGoalList) ++
get_any_errors_warnings2(MaybeRightGoalList),
MaybeGoals = error2(Specs)
)
else
% XXX Provide better ContextPieces.
ContextPieces = cord.init,
parse_goal(Term, ContextPieces, MaybeSubGoal, !VarSet),
(
MaybeSubGoal = ok2(SubGoal, WarningSpecs),
MaybeGoals = ok2([SubGoal], WarningSpecs)
;
MaybeSubGoal = error2(Specs),
MaybeGoals = error2(Specs)
)
).
%---------------------%
:- pred convert_atomic_params(term::in,
assoc_list(atomic_component, term.context)::in,
maybe3(atomic_component_state, atomic_component_state,
maybe(list(prog_var)))::out) is det.
convert_atomic_params(ErrorTerm, ComponentsContexts, MaybeParams) :-
collect_atomic_params(ComponentsContexts,
no, MaybeOuter, no, MaybeInner, no, MaybeVars, [], Specs),
(
Specs = [],
Context = get_term_context(ErrorTerm),
(
MaybeOuter = yes(Outer),
MaybeInner = yes(Inner),
MaybeParams = ok3(Outer, Inner, MaybeVars)
;
MaybeOuter = yes(_),
MaybeInner = no,
Pieces = [words("Atomic goal is missing"),
words("a specification of the inner STM state."), nl],
Spec = spec($pred, severity_error, phase_t2pt, Context, Pieces),
MaybeParams = error3([Spec])
;
MaybeOuter = no,
MaybeInner = yes(_),
Pieces = [words("Atomic goal is missing"),
words("a specification of the outer STM state."), nl],
Spec = spec($pred, severity_error, phase_t2pt, Context, Pieces),
MaybeParams = error3([Spec])
;
MaybeOuter = no,
MaybeInner = no,
Pieces = [words("Atomic goal is missing"),
words("a specification of both"),
words("the outer and inner STM states."), nl],
Spec = spec($pred, severity_error, phase_t2pt, Context, Pieces),
MaybeParams = error3([Spec])
)
;
Specs = [_ | _],
MaybeParams = error3(Specs)
).
:- pred collect_atomic_params(
assoc_list(atomic_component, term.context)::in,
maybe(atomic_component_state)::in, maybe(atomic_component_state)::out,
maybe(atomic_component_state)::in, maybe(atomic_component_state)::out,
maybe(list(prog_var))::in, maybe(list(prog_var))::out,
list(error_spec)::in, list(error_spec)::out) is det.
collect_atomic_params([], !MaybeOuter, !MaybeInner, !MaybeVars, !Specs).
collect_atomic_params([Component - CompContext | ComponentsContexts],
!MaybeOuter, !MaybeInner, !MaybeVars, !Specs) :-
(
Component = atomic_component_outer(Outer),
(
!.MaybeOuter = no,
!:MaybeOuter = yes(Outer)
;
!.MaybeOuter = yes(_),
% XXX We should specify the duplicate parameter.
Pieces = [words("Error: duplicate outer atomic parameter."), nl],
Spec = spec($pred, severity_error, phase_t2pt,
CompContext, Pieces),
!:Specs = !.Specs ++ [Spec]
)
;
Component = atomic_component_inner(Inner),
(
!.MaybeInner = no,
!:MaybeInner = yes(Inner)
;
!.MaybeInner = yes(_),
% XXX We should specify the duplicate parameter.
Pieces = [words("Error: duplicate inner atomic parameter."), nl],
Spec = spec($pred, severity_error, phase_t2pt,
CompContext, Pieces),
!:Specs = !.Specs ++ [Spec]
)
;
Component = atomic_component_vars(Vars),
(
!.MaybeVars = no,
!:MaybeVars = yes(Vars)
;
!.MaybeVars = yes(_),
% XXX We should specify the duplicate parameter.
Pieces = [words("Error: duplicate atomic vars parameter."), nl],
Spec = spec($pred, severity_error, phase_t2pt,
CompContext, Pieces),
!:Specs = !.Specs ++ [Spec]
)
),
collect_atomic_params(ComponentsContexts,
!MaybeOuter, !MaybeInner, !MaybeVars, !Specs).
%---------------------------------------------------------------------------%
:- end_module parse_tree.parse_goal.
%---------------------------------------------------------------------------%
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