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mercury/compiler/prog_io_goal.m
Zoltan Somogyi e77bcdc4ba Add two new kinds of scopes to the language: one that requires the goal inside 
Estimated hours taken: 12
Branches: main

Add two new kinds of scopes to the language: one that requires the goal inside
the scope to have a given determinism, and one that requires it
to be complete, i.e. to have arms for all the function symbols in the type of
the switched-on variable.

The first kind of scope adds the keywords

	require_det require_semidet
	require_multi require_nondet
	require_cc_multi require_cc_nondet
	require_erroneous require_failure

to the language. They are intended to be used like this:

	test_detism_scope(A, !IO) :-
	    (
		A > 10,
		require_det (
		    B = A * 2,
		    C = B mod 3
		),
		C = 1
	    ->
		X = C
	    ;
		X = A
	    ),
	    io.format("test_detism_scope(%d) = %d\n", [i(A), i(X)], !IO).

The second kind of scope adds the keyword require_complete_switch to
the language. They are intended to be used like this:

	do_test_switch_scope(A, X) :-
	    require_complete_switch [A] (
		(
		    A = f1,
		    fail
		;
		    A = f2,
		    ( X = 1
		    ; X = 2
		    )
		;
		    A = f3(B),
		    ( X = 3
		    ; X = B
		    ; X = B + 1
		    )
		)
	    ).

NEWS:
	Announce the new scopes.

doc/reference_manual.texi:
	Document the new scopes.

library/ops.m:
	Add the new keywords as operators.

compiler/hlds_goal.m:
	Add the new kinds of scopes to the HLDS.

compiler/prog_item.m:
	Add the new kinds of scopes to the parse tree type.

compiler/prog_io_goal.m:
	Recognize the new keywords. When we find a term with one of these
	keywords as the function symbol, generate the corresponding parse tree
	goal expression.

compiler/add_clause.m:
	Convert these goal expressions to HLDS.

compiler/simplify.m:
	Check the requirements expressed by the new scopes. If the requirement
	is met, delete the scope wrapper. If the requirement is not met,
	generate an error message and then delete the scope wrapper.

compiler/error_util.m:
	Add a new format_component, words_qoute, which is like quote, but
	yields words, not fixed, after quoting.

compiler/constraint.m:
compiler/det_analysis.m:
compiler/erl_code_gen.m:
compiler/goal_util.m:
compiler/hlds_desc.m:
compiler/hlds_out_goal.m:
compiler/interval.m:
compiler/lambda.m:
compiler/make_hlds_warn.m:
compiler/mercury_to_mercury.m:
compiler/mode_errors.m:
compiler/modecheck_goal.m:
compiler/module_imports.m:
compiler/module_qual.m:
compiler/polymorphism.m:
compiler/prog_util.m:
compiler/purity.m:
compiler/quantification.m:
compiler/saved_vars.m:
compiler/stm_expand.m:
compiler/try_expand.m:
compiler/typecheck.m:
	Conform to the changes to the parse tree and HLDS goal types.
	In one module, take advantage of the new format_component.

tests/hard_coded/require_scopes.{m,exp}:
	A new test case to test the handling of the new scopes when their
	requirements are met.

tests/hard_coded/Mmakefile:
	Add the new test.

tests/invalid/require_scopes.{m,err_exp}:
	A new test case to test the handling of the new scopes when their
	requirements are NOT met.

tests/invalid/Mmakefile:
	Add the new test.
2010-12-29 04:52:23 +00:00

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%-----------------------------------------------------------------------------%
% vim: ft=mercury ts=4 sw=4 et
%-----------------------------------------------------------------------------%
% Copyright (C) 1996-2010 The University of Melbourne.
% This file may only be copied under the terms of the GNU General
% Public License - see the file COPYING in the Mercury distribution.
%-----------------------------------------------------------------------------%
%
% File: prog_io_goal.m.
% Main authors: fjh, zs.
%
% This module defines the predicates that parse goals.
%
%-----------------------------------------------------------------------------%
:- module parse_tree.prog_io_goal.
:- interface.
:- import_module parse_tree.error_util.
:- import_module parse_tree.prog_data.
:- import_module parse_tree.prog_item.
:- import_module parse_tree.prog_io_util.
:- import_module list.
:- import_module term.
%-----------------------------------------------------------------------------%
% Convert a single term into a goal.
%
:- pred parse_goal(term::in, list(format_component)::in, maybe1(goal)::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.)
%
:- pred parse_some_vars_goal(term::in, list(format_component)::in,
maybe3(list(prog_var), list(prog_var), goal)::out,
prog_varset::in, prog_varset::out) is det.
% parse_pred_expression/3 converts the first argument to a :-/2
% higher-order pred expression into a list of variables, a list
% of their corresponding modes, and a determinism.
%
:- pred parse_pred_expression(term::in, ho_groundness::out,
lambda_eval_method::out, list(prog_term)::out, list(mer_mode)::out,
determinism::out) is semidet.
% parse_dcg_pred_expression/3 converts the first argument to a -->/2
% higher-order DCG pred expression into a list of arguments, a list
% of their corresponding modes and the two DCG argument modes, and a
% determinism.
% This is a variant of the higher-order pred syntax:
% `(pred(Var1::Mode1, ..., VarN::ModeN, DCG0Mode, DCGMode)
% is Det --> Goal)'.
%
% For `any' insts replace `pred' with `any_pred'.
%
:- pred parse_dcg_pred_expression(term::in, ho_groundness::out,
lambda_eval_method::out, list(prog_term)::out, list(mer_mode)::out,
determinism::out) is semidet.
% parse_func_expression/3 converts the first argument to a :-/2
% higher-order func expression into a list of arguments, a list
% of their corresponding modes, and a determinism. The syntax
% of a higher-order func expression is
% `(func(Var1::Mode1, ..., VarN::ModeN) = (VarN1::ModeN1) is Det
% :- Goal)'
% or
% `(func(Var1, ..., VarN) = (VarN1) is Det :- Goal)'
% where the modes are assumed to be `in' for the
% function arguments and `out' for the result
% or
% `(func(Var1, ..., VarN) = (VarN1) :- Goal)'
% where the modes are assumed as above, and the
% determinism is assumed to be det
% or
% `(func(Var1, ..., VarN) = (VarN1)). '
%
% For `any' insts replace `func' with `any_func'.
%
:- pred parse_func_expression(term::in, ho_groundness::out,
lambda_eval_method::out, list(prog_term)::out, list(mer_mode)::out,
determinism::out) is semidet.
%-----------------------------------------------------------------------------%
%-----------------------------------------------------------------------------%
:- implementation.
:- import_module mdbcomp.prim_data.
:- import_module parse_tree.mercury_to_mercury.
:- import_module parse_tree.prog_io.
:- import_module parse_tree.prog_io_sym_name.
:- import_module parse_tree.prog_io_util.
:- import_module parse_tree.prog_mode.
:- import_module parse_tree.prog_out.
:- import_module assoc_list.
:- import_module char.
:- import_module maybe.
:- import_module pair.
:- import_module solutions.
:- import_module string.
:- import_module term.
:- 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.
% First, get the goal context.
(
Term = term.functor(_, _, Context)
;
Term = term.variable(_, Context)
),
% 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.
(
% Check for builtins...
Term = term.functor(term.atom(Name), Args, Context),
parse_goal_2(Name, Args, Context, ContextPieces, MaybeGoalPrime,
!VarSet)
->
MaybeGoal = MaybeGoalPrime
;
% It's not a builtin.
term.coerce(Term, ArgsTerm),
% Check for predicate calls.
( try_parse_sym_name_and_args(ArgsTerm, SymName, Args) ->
GoalExpr = call_expr(SymName, Args, purity_pure)
;
% 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.
GoalExpr = call_expr(unqualified("call"), [ArgsTerm], purity_pure)
),
Goal = GoalExpr - Context,
MaybeGoal = ok1(Goal)
).
%-----------------------------------------------------------------------------%
:- pred parse_goal_2(string::in, list(term)::in, term.context::in,
list(format_component)::in, maybe1(goal)::out,
prog_varset::in, prog_varset::out) is semidet.
% Since (A -> B) has different semantics in standard Prolog
% (A -> B ; fail) than it does in NU-Prolog or Mercury (A -> B ; true),
% for the moment we'll just disallow it.
% For consistency we also disallow if-then without the else.
% XXX We should update ContextPieces as we recurse down.
parse_goal_2(Functor, Args, Context, ContextPieces, MaybeGoal, !VarSet) :-
(
Functor = "true",
Args = [],
MaybeGoal = ok1(true_expr - Context)
;
Functor = "fail",
Args = [],
MaybeGoal = ok1(fail_expr - Context)
;
Functor = "=",
Args = [ATerm0, BTerm0],
term.coerce(ATerm0, ATerm),
term.coerce(BTerm0, BTerm),
MaybeGoal = ok1(unify_expr(ATerm, BTerm, purity_pure) - Context)
;
Functor = ",",
Args = [ATerm, BTerm],
parse_goal(ATerm, ContextPieces, MaybeAGoal, !VarSet),
parse_goal(BTerm, ContextPieces, MaybeBGoal, !VarSet),
(
MaybeAGoal = ok1(AGoal),
MaybeBGoal = ok1(BGoal)
->
MaybeGoal = ok1(conj_expr(AGoal, BGoal) - Context)
;
ASpecs = get_any_errors1(MaybeAGoal),
BSpecs = get_any_errors1(MaybeBGoal),
MaybeGoal = error1(ASpecs ++ BSpecs)
)
;
Functor = "&",
Args = [ATerm, BTerm],
parse_goal(ATerm, ContextPieces, MaybeAGoal, !VarSet),
parse_goal(BTerm, ContextPieces, MaybeBGoal, !VarSet),
(
MaybeAGoal = ok1(AGoal),
MaybeBGoal = ok1(BGoal)
->
MaybeGoal = ok1(par_conj_expr(AGoal, BGoal) - Context)
;
ASpecs = get_any_errors1(MaybeAGoal),
BSpecs = get_any_errors1(MaybeBGoal),
MaybeGoal = error1(ASpecs ++ BSpecs)
)
;
Functor = ";",
Args = [ATerm, BTerm],
( ATerm = term.functor(term.atom("->"), [XTerm, YTerm], _Context) ->
parse_some_vars_goal(XTerm, ContextPieces, MaybeXGoal, !VarSet),
parse_goal(YTerm, ContextPieces, MaybeYGoal, !VarSet),
parse_goal(BTerm, ContextPieces, MaybeBGoal, !VarSet),
(
MaybeXGoal = ok3(Vars, StateVars, XGoal),
MaybeYGoal = ok1(YGoal),
MaybeBGoal = ok1(BGoal)
->
Goal = if_then_else_expr(Vars, StateVars, XGoal, YGoal, BGoal)
- Context,
MaybeGoal = ok1(Goal)
;
XSpecs = get_any_errors3(MaybeXGoal),
YSpecs = get_any_errors1(MaybeYGoal),
BSpecs = get_any_errors1(MaybeBGoal),
MaybeGoal = error1(XSpecs ++ YSpecs ++ BSpecs)
)
;
parse_goal(ATerm, ContextPieces, MaybeAGoal, !VarSet),
parse_goal(BTerm, ContextPieces, MaybeBGoal, !VarSet),
(
MaybeAGoal = ok1(AGoal),
MaybeBGoal = ok1(BGoal)
->
MaybeGoal = ok1(disj_expr(AGoal, BGoal) - Context)
;
ASpecs = get_any_errors1(MaybeAGoal),
BSpecs = get_any_errors1(MaybeBGoal),
MaybeGoal = error1(ASpecs ++ BSpecs)
)
)
;
Functor = "else",
Args = [IfTerm, CTerm],
(
IfTerm = term.functor(term.atom("if"),
[term.functor(term.atom("then"), [ATerm, BTerm], _)], _)
->
parse_some_vars_goal(ATerm, ContextPieces, MaybeAGoal, !VarSet),
parse_goal(BTerm, ContextPieces, MaybeBGoal, !VarSet),
parse_goal(CTerm, ContextPieces, MaybeCGoal, !VarSet),
(
MaybeAGoal = ok3(Vars, StateVars, AGoal),
MaybeBGoal = ok1(BGoal),
MaybeCGoal = ok1(CGoal)
->
Goal = if_then_else_expr(Vars, StateVars, AGoal, BGoal, CGoal)
- Context,
MaybeGoal = ok1(Goal)
;
ASpecs = get_any_errors3(MaybeAGoal),
BSpecs = get_any_errors1(MaybeBGoal),
CSpecs = get_any_errors1(MaybeCGoal),
MaybeGoal = error1(ASpecs ++ BSpecs ++ CSpecs)
)
;
% `else' can also be part of a `try' goal.
parse_else_then_try_term(
term.functor(term.atom("else"), [IfTerm, CTerm], Context),
[], no, Context, ContextPieces, MaybeGoal, !VarSet)
)
;
Functor = "then",
Args = [TryTerm, ThenTerm],
parse_then_try_term(
term.functor(atom("then"), [TryTerm, ThenTerm], Context),
no, [], no, Context, ContextPieces, MaybeGoal, !VarSet)
;
Functor = "catch",
Args = [ElseThenTryTerm, CatchTerm],
parse_catch_then_try_term(
term.functor(atom("catch"), [ElseThenTryTerm, CatchTerm], Context),
no, Context, ContextPieces, MaybeGoal, !VarSet)
;
Functor = "catch_any",
Args = [TermA, ArrowTerm],
parse_catch_any_term(ArrowTerm, Context, ContextPieces,
MaybeCatchAnyExpr, !VarSet),
(
MaybeCatchAnyExpr = ok1(CatchAnyExpr),
( TermA = term.functor(atom("catch"), _, _) ->
parse_catch_then_try_term(TermA, yes(CatchAnyExpr),
Context, ContextPieces, MaybeGoal, !VarSet)
;
parse_else_then_try_term(TermA, [], yes(CatchAnyExpr),
Context, ContextPieces, MaybeGoal, !VarSet)
)
;
MaybeCatchAnyExpr = error1(Specs),
MaybeGoal = error1(Specs)
)
;
( Functor = "not"
; Functor = "\\+"
),
Args = [ATerm],
parse_goal(ATerm, ContextPieces, MaybeAGoal, !VarSet),
(
MaybeAGoal = ok1(AGoal),
MaybeGoal = ok1(not_expr(AGoal) - Context)
;
MaybeAGoal = error1(_),
MaybeGoal = MaybeAGoal
)
;
Functor = "all",
Args = [QVarsTerm, SubTerm],
% Extract any state variables in the quantifier.
varset.coerce(!.VarSet, GenericVarSet),
parse_quantifier_vars(QVarsTerm, GenericVarSet, ContextPieces,
MaybeStateVarsAndVars),
% XXX We should update ContextPieces, instead of supplying [].
parse_goal(SubTerm, [], MaybeSubGoal, !VarSet),
(
MaybeStateVarsAndVars = ok2(Vars0, StateVars0),
MaybeSubGoal = ok1(SubGoal)
->
list.map(term.coerce_var, Vars0, Vars),
list.map(term.coerce_var, StateVars0, StateVars),
SubGoal = SubGoalExpr - SubContext,
(
Vars = [],
StateVars = [],
GoalExpr = SubGoalExpr
;
Vars = [],
StateVars = [_ | _],
GoalExpr = all_state_vars_expr(StateVars, SubGoal)
;
Vars = [_ | _],
StateVars = [],
GoalExpr = all_expr(Vars, SubGoal)
;
Vars = [_ | _], StateVars = [_ | _],
GoalExpr = all_expr(Vars,
all_state_vars_expr(StateVars, SubGoal)
- SubContext)
),
Goal = GoalExpr - Context,
MaybeGoal = ok1(Goal)
;
VarsSpecs = get_any_errors2(MaybeStateVarsAndVars),
SubGoalSpecs = get_any_errors1(MaybeSubGoal),
MaybeGoal = error1(VarsSpecs ++ SubGoalSpecs)
)
;
Functor = "<=",
Args = [ATerm, BTerm],
parse_goal(ATerm, ContextPieces, MaybeAGoal, !VarSet),
parse_goal(BTerm, ContextPieces, MaybeBGoal, !VarSet),
(
MaybeAGoal = ok1(AGoal),
MaybeBGoal = ok1(BGoal)
->
MaybeGoal = ok1(implies_expr(BGoal, AGoal) - Context)
;
ASpecs = get_any_errors1(MaybeAGoal),
BSpecs = get_any_errors1(MaybeBGoal),
MaybeGoal = error1(ASpecs ++ BSpecs)
)
;
Functor = "=>",
Args = [ATerm, BTerm],
parse_goal(ATerm, ContextPieces, MaybeAGoal, !VarSet),
parse_goal(BTerm, ContextPieces, MaybeBGoal, !VarSet),
(
MaybeAGoal = ok1(AGoal),
MaybeBGoal = ok1(BGoal)
->
MaybeGoal = ok1(implies_expr(AGoal, BGoal) - Context)
;
ASpecs = get_any_errors1(MaybeAGoal),
BSpecs = get_any_errors1(MaybeBGoal),
MaybeGoal = error1(ASpecs ++ BSpecs)
)
;
Functor = "<=>",
Args = [ATerm, BTerm],
parse_goal(ATerm, ContextPieces, MaybeAGoal, !VarSet),
parse_goal(BTerm, ContextPieces, MaybeBGoal, !VarSet),
(
MaybeAGoal = ok1(AGoal),
MaybeBGoal = ok1(BGoal)
->
MaybeGoal = ok1(equivalent_expr(AGoal, BGoal) - Context)
;
ASpecs = get_any_errors1(MaybeAGoal),
BSpecs = get_any_errors1(MaybeBGoal),
MaybeGoal = error1(ASpecs ++ BSpecs)
)
;
Functor = "some",
Args = [QVarsTerm, SubTerm],
% Extract any state variables in the quantifier.
UpdatedContextPieces = ContextPieces ++ [lower_case_next_if_not_first,
words("In first argument of"), quote("some"), suffix(":")],
varset.coerce(!.VarSet, GenericVarSet),
parse_quantifier_vars(QVarsTerm, GenericVarSet, UpdatedContextPieces,
MaybeStateVarsAndVars),
parse_goal(SubTerm, ContextPieces, MaybeSubGoal, !VarSet),
(
MaybeStateVarsAndVars = ok2(Vars0, StateVars0),
MaybeSubGoal = ok1(SubGoal)
->
list.map(term.coerce_var, Vars0, Vars),
list.map(term.coerce_var, StateVars0, StateVars),
SubGoal = SubGoalExpr - SubContext,
(
Vars = [],
StateVars = [],
GoalExpr = SubGoalExpr
;
Vars = [],
StateVars = [_ | _],
GoalExpr = some_state_vars_expr(StateVars, SubGoal)
;
Vars = [_ | _],
StateVars = [],
GoalExpr = some_expr(Vars, SubGoal)
;
Vars = [_ | _],
StateVars = [_ | _],
GoalExpr = some_expr(Vars,
some_state_vars_expr(StateVars, SubGoal)
- SubContext)
),
Goal = GoalExpr - Context,
MaybeGoal = ok1(Goal)
;
VarsSpecs = get_any_errors2(MaybeStateVarsAndVars),
SubGoalSpecs = get_any_errors1(MaybeSubGoal),
MaybeGoal = error1(VarsSpecs ++ SubGoalSpecs)
)
;
Functor = "trace",
Args = [ParamsTerm, SubTerm],
varset.coerce(!.VarSet, GenericVarSet),
parse_trace_params(GenericVarSet, Context, ParamsTerm, MaybeParams),
parse_goal(SubTerm, ContextPieces, MaybeSubGoal, !VarSet),
(
MaybeParams = ok1(Params),
MaybeSubGoal = ok1(SubGoal)
->
convert_trace_params(Params, MaybeComponents),
(
MaybeComponents = ok4(CompileTime, RunTime, MaybeIO, MutVars),
GoalExpr = trace_expr(CompileTime, RunTime, MaybeIO, MutVars,
SubGoal),
MaybeGoal = ok1(GoalExpr - Context)
;
MaybeComponents = error4(Specs),
MaybeGoal = error1(Specs)
)
;
ParamsSpecs = get_any_errors1(MaybeParams),
SubGoalSpecs = get_any_errors1(MaybeSubGoal),
MaybeGoal = error1(ParamsSpecs ++ SubGoalSpecs)
)
;
Functor = "atomic",
Args = [ParamsTerm, SubTerm],
varset.coerce(!.VarSet, GenericVarSet),
parse_atomic_params(Context, ParamsTerm, GenericVarSet, MaybeParams),
parse_atomic_subexpr(SubTerm, MaybeSubGoals, !VarSet),
(
MaybeParams = ok1(Params),
MaybeSubGoals = ok2(MainGoal, OrElseGoals)
->
convert_atomic_params(ParamsTerm, Params, MaybeComponents),
(
MaybeComponents = ok3(Outer, Inner, MaybeOutputVars),
GoalExpr = atomic_expr(Outer, Inner, MaybeOutputVars, MainGoal,
OrElseGoals),
MaybeGoal = ok1(GoalExpr - Context)
;
MaybeComponents = error3(Specs),
MaybeGoal = error1(Specs)
)
;
ParamsSpecs = get_any_errors1(MaybeParams),
SubGoalSpecs = get_any_errors2(MaybeSubGoals),
MaybeGoal = error1(ParamsSpecs ++ SubGoalSpecs)
)
;
( Functor = "promise_equivalent_solutions"
; Functor = "promise_equivalent_solution_sets"
),
Args = [VarsTerm, SubTerm],
varset.coerce(!.VarSet, GenericVarSet),
parse_vars_and_state_vars(VarsTerm, GenericVarSet, ContextPieces,
MaybeVars),
parse_goal(SubTerm, ContextPieces, MaybeSubGoal, !VarSet),
(
MaybeVars = ok3(Vars0, DotSVars0, ColonSVars0),
MaybeSubGoal = ok1(SubGoal)
->
list.map(term.coerce_var, Vars0, Vars),
list.map(term.coerce_var, DotSVars0, DotSVars),
list.map(term.coerce_var, ColonSVars0, ColonSVars),
(
Functor = "promise_equivalent_solutions",
MaybeGoal = ok1(promise_equivalent_solutions_expr(Vars,
DotSVars, ColonSVars, SubGoal) - Context)
;
Functor = "promise_equivalent_solution_sets",
MaybeGoal = ok1(promise_equivalent_solution_sets_expr(Vars,
DotSVars, ColonSVars, SubGoal) - Context)
)
;
VarsSpecs = get_any_errors3(MaybeVars),
SubGoalSpecs = get_any_errors1(MaybeSubGoal),
MaybeGoal = error1(VarsSpecs ++ SubGoalSpecs)
)
;
Functor = "arbitrary",
Args = [VarsTerm, SubTerm],
varset.coerce(!.VarSet, GenericVarSet),
parse_vars_and_state_vars(VarsTerm, GenericVarSet, ContextPieces,
MaybeVars),
parse_goal(SubTerm, ContextPieces, MaybeSubGoal, !VarSet),
(
MaybeVars = ok3(Vars0, DotSVars0, ColonSVars0),
MaybeSubGoal = ok1(SubGoal)
->
list.map(term.coerce_var, Vars0, Vars),
list.map(term.coerce_var, DotSVars0, DotSVars),
list.map(term.coerce_var, ColonSVars0, ColonSVars),
MaybeGoal = ok1(promise_equivalent_solution_arbitrary_expr(Vars,
DotSVars, ColonSVars, SubGoal) - Context)
;
VarsSpecs = get_any_errors3(MaybeVars),
SubGoalSpecs = get_any_errors1(MaybeSubGoal),
MaybeGoal = error1(VarsSpecs ++ SubGoalSpecs)
)
;
(
Functor = "promise_pure",
Purity = purity_pure
;
Functor = "promise_semipure",
Purity = purity_semipure
;
Functor = "promise_impure",
Purity = purity_impure
),
Args = [SubTerm],
parse_goal(SubTerm, ContextPieces, MaybeSubGoal, !VarSet),
(
MaybeSubGoal = ok1(SubGoal),
Goal = promise_purity_expr(Purity, SubGoal) - Context,
MaybeGoal = ok1(Goal)
;
MaybeSubGoal = error1(Specs),
MaybeGoal = error1(Specs)
)
;
(
Functor = "require_det",
Detism = detism_det
;
Functor = "require_semi",
Detism = detism_semi
;
Functor = "require_multi",
Detism = detism_multi
;
Functor = "require_nondet",
Detism = detism_non
;
Functor = "require_cc_multi",
Detism = detism_cc_multi
;
Functor = "require_cc_nondet",
Detism = detism_cc_non
;
Functor = "require_erroneous",
Detism = detism_erroneous
;
Functor = "require_failure",
Detism = detism_failure
),
Args = [SubTerm],
parse_goal(SubTerm, ContextPieces, MaybeSubGoal, !VarSet),
(
MaybeSubGoal = ok1(SubGoal),
Goal = require_detism_expr(Detism, SubGoal) - Context,
MaybeGoal = ok1(Goal)
;
MaybeSubGoal = error1(Specs),
MaybeGoal = error1(Specs)
)
;
Functor = "require_complete_switch",
Args = [VarsTerm, SubTerm],
varset.coerce(!.VarSet, GenericVarSet),
parse_vars(VarsTerm, GenericVarSet, ContextPieces, MaybeVars),
parse_goal(SubTerm, ContextPieces, MaybeSubGoal, !VarSet),
(
MaybeVars = ok1(Vars0),
MaybeSubGoal = ok1(SubGoal)
->
(
Vars0 = [],
SubGoal = _ - SubContext,
RCSPieces = ContextPieces ++
[words("Error: the first argument of"),
words("require_complete_switch"),
words("must contain a variable."), nl],
RCSSpec = error_spec(severity_error, phase_term_to_parse_tree,
[simple_msg(SubContext, [always(RCSPieces)])]),
MaybeGoal = error1([RCSSpec])
;
Vars0 = [Var0],
term.coerce_var(Var0, Var),
MaybeGoal = ok1(require_complete_switch_expr(Var, SubGoal)
- Context)
;
Vars0 = [_, _ | _],
SubGoal = _ - SubContext,
RCSPieces = ContextPieces ++
[words("Error: the first argument of"),
words("require_complete_switch"),
words("cannot contain more than one variable."), nl],
RCSSpec = error_spec(severity_error, phase_term_to_parse_tree,
[simple_msg(SubContext, [always(RCSPieces)])]),
MaybeGoal = error1([RCSSpec])
)
;
VarsSpecs = get_any_errors1(MaybeVars),
SubGoalSpecs = get_any_errors1(MaybeSubGoal),
MaybeGoal = error1(VarsSpecs ++ SubGoalSpecs)
)
;
(
Functor = "impure",
Purity = purity_impure
;
Functor = "semipure",
Purity = purity_semipure
),
Args = [SubTerm],
parse_goal(SubTerm, ContextPieces, MaybeSubGoal, !VarSet),
(
MaybeSubGoal = ok1(SubGoal),
SubGoal = SubGoalExpr - _SubContext,
( SubGoalExpr = call_expr(Pred, CallArgs, purity_pure) ->
MaybeGoal = ok1(call_expr(Pred, CallArgs, Purity) - Context)
; SubGoalExpr = unify_expr(ProgTerm1, ProgTerm2, purity_pure) ->
MaybeGoal = ok1(unify_expr(ProgTerm1, ProgTerm2, Purity)
- Context)
;
% Inappropriate placement of an impurity marker, so we treat
% it like a predicate call. typecheck.m prints out something
% descriptive for these errors.
%
% XXX we could return MaybeGoal = error1 here.
purity_name(Purity, PurityString),
term.coerce(SubTerm, CoercedSubTerm),
GoalExpr = call_expr(unqualified(PurityString),
[CoercedSubTerm], purity_pure),
MaybeGoal = ok1(GoalExpr - Context)
)
;
MaybeSubGoal = error1(_),
MaybeGoal = MaybeSubGoal
)
;
Functor = "event",
Args = [SubTerm],
parse_goal(SubTerm, ContextPieces, MaybeSubGoal, !VarSet),
(
MaybeSubGoal = ok1(SubGoal),
( SubGoal = call_expr(SymName, CallArgs, Purity) - SubContext ->
(
SymName = unqualified(EventName),
Purity = purity_pure
->
Goal = event_expr(EventName, CallArgs) - Context,
MaybeGoal = ok1(Goal)
;
some [!Specs] (
!:Specs = [],
(
SymName = unqualified(_)
;
SymName = qualified(_, _),
QualPieces = ContextPieces ++
[lower_case_next_if_not_first,
words("Error: event name"),
words("must not be qualified."), nl],
QualSpec = error_spec(severity_error,
phase_term_to_parse_tree,
[simple_msg(SubContext,
[always(QualPieces)])]),
!:Specs = [QualSpec | !.Specs]
),
(
Purity = purity_pure
;
( Purity = purity_semipure
; Purity = purity_impure
),
PurityPieces = ContextPieces ++
[lower_case_next_if_not_first,
words("Error: event cannot be"),
words("impure or semipure."), nl],
PuritySpec = error_spec(severity_error,
phase_term_to_parse_tree,
[simple_msg(SubContext,
[always(PurityPieces)])]),
!:Specs = [PuritySpec | !.Specs]
),
MaybeGoal = error1(!.Specs)
)
)
;
Pieces = ContextPieces ++ [lower_case_next_if_not_first,
words("Error: event prefix must not precede anything"),
words("other than a call."), nl],
Spec = error_spec(severity_error, phase_term_to_parse_tree,
[simple_msg(get_term_context(SubTerm), [always(Pieces)])]),
MaybeGoal = error1([Spec])
)
;
MaybeSubGoal = error1(Specs),
MaybeGoal = error1(Specs)
)
;
Functor = "is",
Args = [ATerm0, BTerm0],
% The following is a temporary hack to handle `is' in the parser -
% we ought to handle it in the code generation - but then `is/2' itself
% is a bit of a hack.
term.coerce(ATerm0, ATerm),
term.coerce(BTerm0, BTerm),
MaybeGoal = ok1(unify_expr(ATerm, BTerm, purity_pure) - Context)
).
%-----------------------------------------------------------------------------%
parse_some_vars_goal(Term, ContextPieces, MaybeVarsAndGoal, !VarSet) :-
( Term = term.functor(term.atom("some"), [QVarsTerm, SubTerm], _Context) ->
UpdatedContextPieces = ContextPieces ++ [lower_case_next_if_not_first,
words("In first argument of"), quote("some"), suffix(":")],
varset.coerce(!.VarSet, GenericVarSet),
parse_quantifier_vars(QVarsTerm, GenericVarSet, UpdatedContextPieces,
MaybeVars),
GoalTerm = SubTerm
;
MaybeVars = ok2([], []),
GoalTerm = Term
),
parse_goal(GoalTerm, ContextPieces, MaybeGoal, !VarSet),
(
MaybeVars = ok2(Vars0, StateVars0),
MaybeGoal = ok1(Goal)
->
list.map(term.coerce_var, Vars0, Vars),
list.map(term.coerce_var, StateVars0, StateVars),
MaybeVarsAndGoal = ok3(Vars, StateVars, Goal)
;
VarsSpecs = get_any_errors2(MaybeVars),
GoalSpecs = get_any_errors1(MaybeGoal),
MaybeVarsAndGoal = error3(VarsSpecs ++ GoalSpecs)
).
%-----------------------------------------------------------------------------%
:- 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) :-
( Term = term.functor(term.atom("[]"), [], _) ->
MaybeComponentsContexts = ok1([])
; Term = term.functor(term.atom("[|]"), [HeadTerm, TailTerm], _) ->
parse_trace_component(VarSet, Term, HeadTerm,
MaybeHeadComponentContext),
parse_trace_params(VarSet, Context, TailTerm,
MaybeTailComponentsContexts),
(
MaybeHeadComponentContext = ok1(HeadComponentContext),
MaybeTailComponentsContexts = ok1(TailComponentsContexts)
->
MaybeComponentsContexts =
ok1([HeadComponentContext | TailComponentsContexts])
;
HeadSpecs = get_any_errors1(MaybeHeadComponentContext),
TailSpecs = get_any_errors1(MaybeTailComponentsContexts),
MaybeComponentsContexts = error1(HeadSpecs ++ TailSpecs)
)
;
TermStr = describe_error_term(VarSet, Term),
Pieces = [words("Error: invalid trace goal parameter"),
quote(TermStr), suffix("."), nl],
Spec = error_spec(severity_error, phase_term_to_parse_tree,
[simple_msg(get_term_context(Term), [always(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) :-
(
Term = term.functor(Functor, SubTerms, Context),
Functor = term.atom(Atom)
->
(
( Atom = "compiletime"
; Atom = "compile_time"
)
->
( SubTerms = [SubTerm] ->
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)
)
;
Pieces = [words("Error:"), fixed(Atom),
words("takes exactly one argument,"),
words("which should be a boolean expression"),
words("of compile-time tests."), nl],
Spec = error_spec(severity_error, phase_term_to_parse_tree,
[simple_msg(Context, [always(Pieces)])]),
MaybeComponentContext = error1([Spec])
)
;
( Atom = "runtime"
; Atom = "run_time"
)
->
( SubTerms = [SubTerm] ->
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)
)
;
Pieces = [words("Error:"), fixed(Atom),
words("takes exactly one argument,"),
words("which should be a boolean expression"),
words("of run-time tests."), nl],
Spec = error_spec(severity_error, phase_term_to_parse_tree,
[simple_msg(Context, [always(Pieces)])]),
MaybeComponentContext = error1([Spec])
)
;
Atom = "io"
->
( SubTerms = [SubTerm] ->
(
SubTerm = term.functor(term.atom("!"),
[term.variable(Var, _)], _)
->
term.coerce_var(Var, ProgVar),
Component = trace_component_maybe_io(ProgVar),
MaybeComponentContext = ok1(Component - Context)
;
Pieces = [words("Error: the argument of"), fixed(Atom),
words("should be a state variable."), nl],
Spec = error_spec(severity_error,
phase_term_to_parse_tree,
[simple_msg(get_term_context(SubTerm),
[always(Pieces)])]),
MaybeComponentContext = error1([Spec])
)
;
Pieces = [words("Error:"), fixed(Atom),
words("takes exactly one argument,"),
words("which should be a state variable name."), nl],
Spec = error_spec(severity_error, phase_term_to_parse_tree,
[simple_msg(Context, [always(Pieces)])]),
MaybeComponentContext = error1([Spec])
)
;
Atom = "state"
->
( SubTerms = [SubTermA, SubTermB] ->
( SubTermA = term.functor(term.atom(MutableName), [], _) ->
MaybeMutable = ok1(MutableName)
;
MutablePieces = [words("Error: the first argument of"),
fixed(Atom), words("should be"),
words("the name of a mutable variable."), nl],
MutableSpec = error_spec(severity_error,
phase_term_to_parse_tree,
[simple_msg(get_term_context(SubTermA),
[always(MutablePieces)])]),
MaybeMutable = error1([MutableSpec])
),
(
SubTermB = term.functor(term.atom("!"),
[term.variable(Var, _)], _)
->
MaybeVar = ok1(Var)
;
VarPieces = [words("Error: the second argument of"),
fixed(Atom), words("should be"),
words("a state variable name."), nl],
VarSpec = error_spec(severity_error,
phase_term_to_parse_tree,
[simple_msg(get_term_context(SubTermB),
[always(VarPieces)])]),
MaybeVar = error1([VarSpec])
),
(
MaybeMutable = ok1(FinalMutable),
MaybeVar = ok1(FinalVar)
->
term.coerce_var(FinalVar, ProgVar),
MutableVar = trace_mutable_var(FinalMutable, ProgVar),
Component = trace_component_mutable_var(MutableVar),
MaybeComponentContext = ok1(Component - Context)
;
VarSpecs = get_any_errors1(MaybeVar),
MutableSpecs = get_any_errors1(MaybeMutable),
MaybeComponentContext =
error1(VarSpecs ++ MutableSpecs)
)
;
Pieces = [words("Error:"), fixed(Atom),
words("takes exactly two arguments,"),
words("which should be"),
words("the name of a mutable variable"),
words("and a state variable name."), nl],
Spec = error_spec(severity_error, phase_term_to_parse_tree,
[simple_msg(Context, [always(Pieces)])]),
MaybeComponentContext = error1([Spec])
)
;
TermStr = describe_error_term(VarSet, Term),
Pieces = [words("Error: invalid trace goal parameter"),
quote(TermStr), suffix("."), nl],
Spec = error_spec(severity_error, phase_term_to_parse_tree,
[simple_msg(Context, [always(Pieces)])]),
MaybeComponentContext = error1([Spec])
)
;
TermStr = describe_error_term(VarSet, Term),
Pieces = [words("Error: invalid trace goal parameter"),
quote(TermStr), suffix("."), nl],
Spec = error_spec(severity_error, phase_term_to_parse_tree,
[simple_msg(get_term_context(Term), [always(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) :-
(
Term = term.functor(term.atom(Atom), [LTerm, RTerm], _),
(
Atom = "or",
Op = trace_or
;
Atom = "and",
Op = trace_and
)
->
parse_trace_tree(BaseParser, LTerm, MaybeLExpr),
parse_trace_tree(BaseParser, RTerm, MaybeRExpr),
(
MaybeLExpr = ok1(LExpr),
MaybeRExpr = ok1(RExpr)
->
MaybeTree = ok1(trace_op(Op, LExpr, RExpr))
;
LSpecs = get_any_errors1(MaybeLExpr),
RSpecs = get_any_errors1(MaybeRExpr),
MaybeTree = error1(LSpecs ++ RSpecs)
)
;
Term = term.functor(term.atom("not"), [SubTerm], _)
->
parse_trace_tree(BaseParser, SubTerm, MaybeSubExpr),
(
MaybeSubExpr = ok1(SubExpr)
->
MaybeTree = ok1(trace_not(SubExpr))
;
SubSpecs = get_any_errors1(MaybeSubExpr),
MaybeTree = error1(SubSpecs)
)
;
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) :-
(
Term = term.functor(Functor, SubTerms, TermContext),
Functor = term.atom(Atom)
->
( Atom = "flag" ->
( SubTerms = [SubTerm] ->
( SubTerm = term.functor(term.string(FlagName), [], _) ->
Compiletime = trace_flag(FlagName),
MaybeCompiletime = ok1(Compiletime)
;
Pieces = [words("Error: compile_time parameter"),
quote("flag"),
words("takes a string as argument."), nl],
Spec = error_spec(severity_error,
phase_term_to_parse_tree,
[simple_msg(TermContext, [always(Pieces)])]),
MaybeCompiletime = error1([Spec])
)
;
Pieces = [words("Error: compile_time parameter"),
quote("flag"), words("takes just one argument."), nl],
Spec = error_spec(severity_error, phase_term_to_parse_tree,
[simple_msg(TermContext, [always(Pieces)])]),
MaybeCompiletime = error1([Spec])
)
; Atom = "grade" ->
( SubTerms = [SubTerm] ->
(
SubTerm = term.functor(term.atom(GradeName), [], _),
parse_trace_grade_name(GradeName, TraceGrade)
->
Compiletime = trace_grade(TraceGrade),
MaybeCompiletime = ok1(Compiletime)
;
solutions(valid_trace_grade_name, ValidGradeNames),
Pieces = [words("invalid grade test;"),
words("valid grade tests are")] ++
list_to_pieces(ValidGradeNames) ++
[suffix("."), nl],
Spec = error_spec(severity_error,
phase_term_to_parse_tree,
[simple_msg(TermContext, [always(Pieces)])]),
MaybeCompiletime = error1([Spec])
)
;
Pieces = [words("Error: compile_time parameter"),
quote("grade"), words("takes just one argument."), nl],
Spec = error_spec(severity_error, phase_term_to_parse_tree,
[simple_msg(TermContext, [always(Pieces)])]),
MaybeCompiletime = error1([Spec])
)
; Atom = "tracelevel" ->
( SubTerms = [SubTerm] ->
(
SubTerm = term.functor(term.atom(LevelName), [], _),
(
LevelName = "shallow",
Level = trace_level_shallow
;
LevelName = "deep",
Level = trace_level_deep
)
->
Compiletime = trace_trace_level(Level),
MaybeCompiletime = ok1(Compiletime)
;
Pieces = [words("Error: compile_time parameter"),
quote("tracelevel"), words("takes just"),
quote("shallow"), words("or"), quote("deep"),
words("as argument."), nl],
Spec = error_spec(severity_error,
phase_term_to_parse_tree,
[simple_msg(TermContext, [always(Pieces)])]),
MaybeCompiletime = error1([Spec])
)
;
Pieces = [words("Error: compile_time parameter"),
quote("tracelevel"),
words("takes just one argument."), nl],
Spec = error_spec(severity_error, phase_term_to_parse_tree,
[simple_msg(TermContext, [always(Pieces)])]),
MaybeCompiletime = error1([Spec])
)
;
TermStr = describe_error_term(VarSet, Term),
Pieces = [words("Error: invalid compile_time parameter"),
quote(TermStr), suffix("."), nl],
Spec = error_spec(severity_error, phase_term_to_parse_tree,
[simple_msg(TermContext, [always(Pieces)])]),
MaybeCompiletime = error1([Spec])
)
;
TermStr = describe_error_term(VarSet, Term),
Pieces = [words("Error: invalid compile_time parameter"),
quote(TermStr), suffix("."), nl],
Spec = error_spec(severity_error, phase_term_to_parse_tree,
[simple_msg(get_term_context(Term), [always(Pieces)])]),
MaybeCompiletime = error1([Spec])
).
:- pred parse_trace_runtime(varset::in, term::in,
maybe1(trace_runtime)::out) is det.
parse_trace_runtime(VarSet, Term, MaybeRuntime) :-
(
Term = term.functor(Functor, SubTerms, TermContext),
Functor = term.atom(Atom)
->
( Atom = "env" ->
( SubTerms = [SubTerm] ->
(
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, _, [])
->
Runtime = trace_envvar(EnvVarName),
MaybeRuntime = ok1(Runtime)
;
Pieces = [words("Error: run_time parameter"), quote("env"),
words("takes an identifier as argument."), nl],
Spec = error_spec(severity_error,
phase_term_to_parse_tree,
[simple_msg(get_term_context(SubTerm),
[always(Pieces)])]),
MaybeRuntime = error1([Spec])
)
;
Pieces = [words("Error: run_time parameter"), quote("env"),
words("takes just one argument."), nl],
Spec = error_spec(severity_error, phase_term_to_parse_tree,
[simple_msg(TermContext, [always(Pieces)])]),
MaybeRuntime = error1([Spec])
)
;
TermStr = describe_error_term(VarSet, Term),
Pieces = [words("Error: invalid run_time parameter"),
quote(TermStr), suffix("."), nl],
Spec = error_spec(severity_error, phase_term_to_parse_tree,
[simple_msg(TermContext, [always(Pieces)])]),
MaybeRuntime = error1([Spec])
)
;
TermStr = describe_error_term(VarSet, Term),
Pieces = [words("Error: invalid run_time parameter"),
quote(TermStr), suffix("."), nl],
Spec = error_spec(severity_error, phase_term_to_parse_tree,
[simple_msg(get_term_context(Term), [always(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) :-
convert_trace_params_2(Components, no, no, no, [], [], MaybeParams).
:- pred convert_trace_params_2(assoc_list(trace_component, term.context)::in,
maybe(trace_expr(trace_compiletime))::in,
maybe(trace_expr(trace_runtime))::in,
maybe(prog_var)::in, list(trace_mutable_var)::in,
list(error_spec)::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_2([], MaybeCompileTime, MaybeRunTime, MaybeIO,
MutableVars, Specs, MaybeParams) :-
(
Specs = [],
MaybeParams = ok4(MaybeCompileTime, MaybeRunTime, MaybeIO, MutableVars)
;
Specs = [_ | _],
MaybeParams = error4(Specs)
).
convert_trace_params_2([Component - Context | ComponentsContexts],
!.MaybeCompileTime, !.MaybeRunTime, !.MaybeIO, !.MutableVars,
!.Specs, MaybeParams) :-
(
Component = trace_component_compiletime(CompileTime),
(
!.MaybeCompileTime = no,
!:MaybeCompileTime = yes(CompileTime)
;
!.MaybeCompileTime = yes(_),
Pieces = [words("Duplicate compile_time trace parameter."), nl],
Spec = error_spec(severity_error, phase_term_to_parse_tree,
[simple_msg(Context, [always(Pieces)])]),
!:Specs = [Spec | !.Specs]
)
;
Component = trace_component_runtime(RunTime),
(
!.MaybeRunTime = no,
!:MaybeRunTime = yes(RunTime)
;
!.MaybeRunTime = yes(_),
Pieces = [words("Duplicate run_time trace parameter."), nl],
Spec = error_spec(severity_error, phase_term_to_parse_tree,
[simple_msg(Context, [always(Pieces)])]),
!:Specs = [Spec | !.Specs]
)
;
Component = trace_component_maybe_io(IOStateVar),
(
!.MaybeIO = no,
!:MaybeIO = yes(IOStateVar)
;
!.MaybeIO = yes(_),
Pieces = [words("Duplicate io trace parameter."), nl],
Spec = error_spec(severity_error, phase_term_to_parse_tree,
[simple_msg(Context, [always(Pieces)])]),
!:Specs = [Spec | !.Specs]
)
;
Component = trace_component_mutable_var(MutableVar),
!:MutableVars = !.MutableVars ++ [MutableVar]
),
convert_trace_params_2(ComponentsContexts, !.MaybeCompileTime,
!.MaybeRunTime, !.MaybeIO, !.MutableVars, !.Specs, MaybeParams).
%-----------------------------------------------------------------------------%
:- pred parse_catch_any_term(term::in, term.context::in,
list(format_component)::in, maybe1(catch_any_expr)::out,
prog_varset::in, prog_varset::out) is semidet.
parse_catch_any_term(ArrowTerm, _Context, ContextPieces, MaybeCatchAny,
!VarSet) :-
ArrowTerm = term.functor(atom("->"), [VarTerm0, GoalTerm], TermContext),
( VarTerm0 = term.variable(Var0, _) ->
term.coerce_var(Var0, Var),
parse_goal(GoalTerm, ContextPieces, MaybeGoal, !VarSet),
(
MaybeGoal = ok1(Goal),
CatchAny = catch_any_expr(Var, Goal),
MaybeCatchAny = ok1(CatchAny)
;
MaybeGoal = error1(Error),
MaybeCatchAny = error1(Error)
)
;
Pieces = [words("Error: the argument of catch_any"),
words("should be a variable."), nl],
Spec = error_spec(severity_error, phase_term_to_parse_tree,
[simple_msg(TermContext, [always(Pieces)])]),
MaybeCatchAny = error1([Spec])
).
:- pred parse_catch_then_try_term(term::in, maybe(catch_any_expr)::in,
term.context::in, list(format_component)::in, maybe1(goal)::out,
prog_varset::in, prog_varset::out) is semidet.
parse_catch_then_try_term(CatchElseThenTryTerm, MaybeCatchAnyExpr,
Context, ContextPieces, MaybeGoal, !VarSet) :-
CatchElseThenTryTerm = term.functor(atom("catch"), [TermA, TermB], _),
parse_sub_catch_terms(TermB, Context, ContextPieces, MaybeCatches,
!VarSet),
(
MaybeCatches = ok1(Catches),
parse_else_then_try_term(TermA, Catches, MaybeCatchAnyExpr,
Context, ContextPieces, MaybeGoal, !VarSet)
;
MaybeCatches = error1(Error),
MaybeGoal = error1(Error)
).
:- pred parse_sub_catch_terms(term::in, term.context::in,
list(format_component)::in, maybe1(list(catch_expr))::out,
prog_varset::in, prog_varset::out) is semidet.
parse_sub_catch_terms(Term, Context, ContextPieces, MaybeCatches, !VarSet) :-
( Term = functor(atom("catch"), [CatchArrowTerm, SubTerm], _) ->
parse_catch_arrow_term(CatchArrowTerm, Context, ContextPieces,
MaybeCatch, !VarSet),
(
MaybeCatch = ok1(Catch),
parse_sub_catch_terms(SubTerm, Context, ContextPieces,
MaybeCatches0, !VarSet),
(
MaybeCatches0 = ok1(Catches0),
MaybeCatches = ok1([Catch | Catches0])
;
MaybeCatches0 = error1(Error),
MaybeCatches = error1(Error)
)
;
MaybeCatch = error1(Error),
MaybeCatches = error1(Error)
)
;
parse_catch_arrow_term(Term, Context, ContextPieces, MaybeCatch,
!VarSet),
(
MaybeCatch = ok1(Catch),
MaybeCatches = ok1([Catch])
;
MaybeCatch = error1(Error),
MaybeCatches = error1(Error)
)
).
:- pred parse_catch_arrow_term(term::in, term.context::in,
list(format_component)::in, maybe1(catch_expr)::out,
prog_varset::in, prog_varset::out) is semidet.
parse_catch_arrow_term(CatchArrowTerm, _Context, ContextPieces, MaybeCatch,
!VarSet) :-
CatchArrowTerm = term.functor(atom("->"), [PatternTerm0, GoalTerm], _),
term.coerce(PatternTerm0, PatternTerm),
parse_goal(GoalTerm, ContextPieces, MaybeGoal, !VarSet),
(
MaybeGoal = ok1(Goal),
Catch = catch_expr(PatternTerm, Goal),
MaybeCatch = ok1(Catch)
;
MaybeGoal = error1(Error),
MaybeCatch = error1(Error)
).
:- pred parse_else_then_try_term(term::in, list(catch_expr)::in,
maybe(catch_any_expr)::in, term.context::in, list(format_component)::in,
maybe1(goal)::out, prog_varset::in, prog_varset::out) is semidet.
parse_else_then_try_term(Term, CatchExprs, MaybeCatchAnyExpr,
Context, ContextPieces, MaybeGoal, !VarSet) :-
% `else' part may or may not exist in `try' goals.
( Term = term.functor(term.atom("else"), [ThenTerm, ElseTerm], _) ->
parse_goal(ElseTerm, ContextPieces, MaybeElseGoal0, !VarSet),
(
MaybeElseGoal0 = ok1(ElseGoal),
parse_then_try_term(ThenTerm, yes(ElseGoal), CatchExprs,
MaybeCatchAnyExpr, Context, ContextPieces, MaybeGoal, !VarSet)
;
MaybeElseGoal0 = error1(Specs),
MaybeGoal = error1(Specs)
)
;
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, list(format_component)::in,
maybe1(goal)::out, prog_varset::in, prog_varset::out) is semidet.
parse_then_try_term(ThenTryTerm, MaybeElse, CatchExprs, MaybeCatchAnyExpr,
Context, ContextPieces, MaybeGoal, !VarSet) :-
ThenTryTerm = term.functor(term.atom("then"), [TryTerm, ThenTerm], _),
TryTerm = term.functor(term.atom("try"), [ParamsTerm, TryGoalTerm], _),
varset.coerce(!.VarSet, GenericVarSet),
parse_try_params(GenericVarSet, Context, ParamsTerm, MaybeParams),
parse_goal(TryGoalTerm, ContextPieces, MaybeTryGoal, !VarSet),
parse_goal(ThenTerm, ContextPieces, MaybeThenGoal, !VarSet),
(
MaybeParams = ok1(Params),
MaybeTryGoal = ok1(TryGoal),
MaybeThenGoal = ok1(ThenGoal)
->
convert_try_params(Params, MaybeComponents),
(
MaybeComponents = ok1(MaybeIO),
GoalExpr = try_expr(MaybeIO, TryGoal, ThenGoal, MaybeElse,
CatchExprs, MaybeCatchAnyExpr),
MaybeGoal = ok1(GoalExpr - Context)
;
MaybeComponents = error1(Specs),
MaybeGoal = error1(Specs)
)
;
ParamsSpecs = get_any_errors1(MaybeParams),
TryGoalSpecs = get_any_errors1(MaybeTryGoal),
ThenGoalSpecs = get_any_errors1(MaybeThenGoal),
MaybeGoal = error1(ParamsSpecs ++ TryGoalSpecs ++ ThenGoalSpecs)
).
:- 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) :-
( Term = term.functor(term.atom("[]"), [], _) ->
MaybeComponentsContexts = ok1([])
; Term = term.functor(term.atom("[|]"), [HeadTerm, TailTerm], _) ->
parse_try_component(VarSet, Term, HeadTerm,
MaybeHeadComponentContext),
parse_try_params(VarSet, Context, TailTerm,
MaybeTailComponentsContexts),
(
MaybeHeadComponentContext = ok1(HeadComponentContext),
MaybeTailComponentsContexts = ok1(TailComponentsContexts)
->
MaybeComponentsContexts =
ok1([HeadComponentContext | TailComponentsContexts])
;
HeadSpecs = get_any_errors1(MaybeHeadComponentContext),
TailSpecs = get_any_errors1(MaybeTailComponentsContexts),
MaybeComponentsContexts = error1(HeadSpecs ++ TailSpecs)
)
;
TermStr = describe_error_term(VarSet, Term),
Pieces = [words("Error: invalid try goal parameter"),
quote(TermStr), suffix("."), nl],
Spec = error_spec(severity_error, phase_term_to_parse_tree,
[simple_msg(get_term_context(Term), [always(Pieces)])]),
MaybeComponentsContexts = error1([Spec])
).
:- pred parse_try_component(varset::in, term::in, term::in,
maybe1(pair(try_component, term.context))::out) is det.
parse_try_component(VarSet, _ErrorTerm, Term, MaybeComponentContext) :-
(
Term = term.functor(Functor, SubTerms, Context),
Functor = term.atom(Atom)
->
( Atom = "io" ->
( SubTerms = [SubTerm] ->
(
SubTerm = term.functor(term.atom("!"),
[term.variable(Var, _)], _)
->
term.coerce_var(Var, ProgVar),
Component = try_component_maybe_io(ProgVar),
MaybeComponentContext = ok1(Component - Context)
;
Pieces = [words("Error: the argument of"), fixed(Atom),
words("should be a state variable."), nl],
Spec = error_spec(severity_error,
phase_term_to_parse_tree,
[simple_msg(get_term_context(SubTerm),
[always(Pieces)])]),
MaybeComponentContext = error1([Spec])
)
;
Pieces = [words("Error:"), fixed(Atom),
words("takes exactly one argument,"),
words("which should be a state variable name."), nl],
Spec = error_spec(severity_error, phase_term_to_parse_tree,
[simple_msg(Context, [always(Pieces)])]),
MaybeComponentContext = error1([Spec])
)
;
TermStr = describe_error_term(VarSet, Term),
Pieces = [words("Error: invalid try goal parameter"),
quote(TermStr), suffix("."), nl],
Spec = error_spec(severity_error, phase_term_to_parse_tree,
[simple_msg(Context, [always(Pieces)])]),
MaybeComponentContext = error1([Spec])
)
;
TermStr = describe_error_term(VarSet, Term),
Pieces = [words("Error: invalid try goal parameter"),
quote(TermStr), suffix("."), nl],
Spec = error_spec(severity_error, phase_term_to_parse_tree,
[simple_msg(get_term_context(Term), [always(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) :-
convert_try_params_2(Components, no, [], MaybeParams).
:- pred convert_try_params_2(assoc_list(try_component, term.context)::in,
maybe(prog_var)::in, list(error_spec)::in,
maybe1(maybe(prog_var))::out) is det.
convert_try_params_2([], MaybeIO, Specs, MaybeParams) :-
(
Specs = [],
MaybeParams = ok1(MaybeIO)
;
Specs = [_ | _],
MaybeParams = error1(Specs)
).
convert_try_params_2([Component - Context | ComponentsContexts],
!.MaybeIO, !.Specs, MaybeParams) :-
Component = try_component_maybe_io(IOStateVar),
(
!.MaybeIO = no,
!:MaybeIO = yes(IOStateVar)
;
!.MaybeIO = yes(_),
Pieces = [words("Duplicate io try parameter."), nl],
Spec = error_spec(severity_error, phase_term_to_parse_tree,
[simple_msg(Context, [always(Pieces)])]),
!:Specs = [Spec | !.Specs]
),
convert_try_params_2(ComponentsContexts, !.MaybeIO, !.Specs, MaybeParams).
%-----------------------------------------------------------------------------%
:- 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) :-
( Term = term.functor(term.atom("[]"), [], _) ->
MaybeComponentsContexts = ok1([])
; Term = term.functor(term.atom("[|]"), [HeadTerm, TailTerm], _) ->
parse_atomic_component(Term, HeadTerm, VarSet, MaybeHeadComponent),
parse_atomic_params(Context, TailTerm, VarSet,
MaybeTailComponentsContexts),
(
MaybeHeadComponent = ok1(HeadComponent),
MaybeTailComponentsContexts = ok1(TailComponentsContexts)
->
MaybeComponentsContexts =
ok1([HeadComponent | TailComponentsContexts])
;
HeadSpecs = get_any_errors1(MaybeHeadComponent),
TailSpecs = get_any_errors1(MaybeTailComponentsContexts),
MaybeComponentsContexts = error1(HeadSpecs ++ TailSpecs)
)
;
(
Term = term.functor(_, _, TermContext),
Pieces = [words("Invalid atomic goal parameter."), nl],
Spec = error_spec(severity_error, phase_term_to_parse_tree,
[simple_msg(TermContext, [always(Pieces)])]),
MaybeComponentsContexts = error1([Spec])
;
Term = term.variable(_, TermContext),
Pieces = [words("Expected atomic goal parameter, found variable."),
nl],
Spec = error_spec(severity_error, phase_term_to_parse_tree,
[simple_msg(TermContext, [always(Pieces)])]),
MaybeComponentsContexts = error1([Spec])
)
).
:- pred parse_atomic_subterm(string::in, term::in, term::in,
maybe1(atomic_component_state)::out) is det.
parse_atomic_subterm(Name, ErrorTerm, Term, MaybeComponentState) :-
(
Term = term.functor(_, SubTerms, TermContext),
( parse_atomic_component_state_or_pair(SubTerms, ComponentState) ->
MaybeComponentState = ok1(ComponentState)
;
Pieces = [words("Error:"), words(Name),
words("takes exactly one argument,"),
words("which should be a state variable"),
words("or a pair of variables."), nl],
Spec = error_spec(severity_error, phase_term_to_parse_tree,
[simple_msg(TermContext, [always(Pieces)])]),
MaybeComponentState = error1([Spec])
)
;
Term = term.variable(_, _TermContext),
Pieces = [words("Error: expected atomic goal parameter,"),
words("found variable."), nl],
Spec = error_spec(severity_error, phase_term_to_parse_tree,
[simple_msg(get_term_context(ErrorTerm), [always(Pieces)])]),
MaybeComponentState = 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),
( Functor = term.atom(Atom) ->
% XXX Make parse_atomic_subterm do the postprocessing done here.
( Atom = "outer" ->
parse_atomic_subterm(Atom, ErrorTerm, Term,
MaybeComponentSubTerm),
(
MaybeComponentSubTerm = ok1(CompTerm),
Component = atomic_component_outer(CompTerm),
MaybeComponentContext = ok1(Component - Context)
;
MaybeComponentSubTerm = error1(Specs),
MaybeComponentContext = error1(Specs)
)
; Atom = "inner" ->
parse_atomic_subterm(Atom, ErrorTerm, Term,
MaybeComponentSubTerm),
(
MaybeComponentSubTerm = ok1(CompTerm),
Component = atomic_component_inner(CompTerm),
MaybeComponentContext = ok1(Component - Context)
;
MaybeComponentSubTerm = error1(Specs),
MaybeComponentContext = error1(Specs)
)
; Atom = "vars" ->
( SubTerms = [SubTerm] ->
ContextPieces = [words("In"), quote("vars"),
words("specifier of atomic scope:")],
parse_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)
)
;
Pieces = [words(Atom), words("takes exact one argument,"),
words("which should be a list of variable names."),
nl],
Spec = error_spec(severity_error, phase_term_to_parse_tree,
[simple_msg(Context, [always(Pieces)])]),
MaybeComponentContext = error1([Spec])
)
;
Pieces = [words("Invalid atomic goal parameter."), nl],
Spec = error_spec(severity_error, phase_term_to_parse_tree,
[simple_msg(Context, [always(Pieces)])]),
MaybeComponentContext = error1([Spec])
)
;
Pieces = [words("Invalid atomic goal parameter."), nl],
Spec = error_spec(severity_error, phase_term_to_parse_tree,
[simple_msg(Context, [always(Pieces)])]),
MaybeComponentContext = error1([Spec])
)
;
Term = term.variable(_, _Context),
Pieces = [words("Expected atomic goal parameter, found variable."),
nl],
Spec = error_spec(severity_error, phase_term_to_parse_tree,
[simple_msg(get_term_context(ErrorTerm), [always(Pieces)])]),
MaybeComponentContext = 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) :-
(
SubTerms = [Term],
Term = term.functor(term.atom("!"), [term.variable(Var, _)], _)
->
term.coerce_var(Var, ProgVar),
State = atomic_state_var(ProgVar)
;
SubTerms = [TermA, TermB],
TermA = term.variable(VarA, _),
TermB = term.variable(VarB, _)
->
term.coerce_var(VarA, ProgVarA),
term.coerce_var(VarB, ProgVarB),
State = atomic_var_pair(ProgVarA, ProgVarB)
;
fail
).
% XXX reorder the predicates above
:- 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) :-
convert_atomic_params_2(get_term_context(ErrorTerm), ComponentsContexts,
no, no, no, [], MaybeParams).
:- pred convert_atomic_params_2(term.context::in,
assoc_list(atomic_component, term.context)::in,
maybe(atomic_component_state)::in,
maybe(atomic_component_state)::in,
maybe(list(prog_var))::in, list(error_spec)::in,
maybe3(atomic_component_state, atomic_component_state,
maybe(list(prog_var)))::out) is det.
convert_atomic_params_2(Context, [], MaybeOuter, MaybeInner, MaybeVars,
Specs, MaybeParams) :-
(
Specs = [],
(
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 = error_spec(severity_error, phase_term_to_parse_tree,
[simple_msg(Context, [always(Pieces)])]),
MaybeParams = error3([Spec])
;
MaybeOuter = no,
MaybeInner = yes(_),
Pieces = [words("Atomic goal is missing"),
words("a specification of the outer STM state."), nl],
Spec = error_spec(severity_error, phase_term_to_parse_tree,
[simple_msg(Context, [always(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 = error_spec(severity_error, phase_term_to_parse_tree,
[simple_msg(Context, [always(Pieces)])]),
MaybeParams = error3([Spec])
)
;
Specs = [_ | _],
MaybeParams = error3(Specs)
).
convert_atomic_params_2(Context,
[Component - CompContext | ComponentsContexts],
!.MaybeOuter, !.MaybeInner, !.MaybeVars, !.Specs, MaybeParams) :-
(
Component = atomic_component_outer(Outer),
(
!.MaybeOuter = no,
!:MaybeOuter = yes(Outer)
;
!.MaybeOuter = yes(_),
% XXX We should specify the duplicate parameter.
Pieces = [words("Duplicate outer atomic parameter."), nl],
Spec = error_spec(severity_error, phase_term_to_parse_tree,
[simple_msg(CompContext, [always(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("Duplicate inner atomic parameter."), nl],
Spec = error_spec(severity_error, phase_term_to_parse_tree,
[simple_msg(CompContext, [always(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("Duplicate atomic vars parameter."), nl],
Spec = error_spec(severity_error, phase_term_to_parse_tree,
[simple_msg(CompContext, [always(Pieces)])]),
!:Specs = !.Specs ++ [Spec]
)
),
convert_atomic_params_2(Context, ComponentsContexts,
!.MaybeOuter, !.MaybeInner, !.MaybeVars, !.Specs, MaybeParams).
:- pred parse_atomic_subexpr(term::in, maybe2(goal, goals)::out,
prog_varset::in, prog_varset::out) is det.
parse_atomic_subexpr(Term, MaybeSubExpr, !VarSet) :-
parse_atomic_subgoals_as_list(Term, MaybeGoalList, !VarSet),
(
MaybeGoalList = ok1(GoalList),
(
GoalList = [],
Pieces = [words("Error: atomic scope must have a goal."), nl],
Context = get_term_context(Term),
Spec = error_spec(severity_error, phase_term_to_parse_tree,
[simple_msg(Context, [always(Pieces)])]),
MaybeSubExpr = error2([Spec])
;
GoalList = [MainSubGoalExpr | OrElseAlternativeSubExpr],
MaybeSubExpr = ok2(MainSubGoalExpr, OrElseAlternativeSubExpr)
)
;
MaybeGoalList = error1(Specs),
MaybeSubExpr = error2(Specs)
).
:- pred parse_atomic_subgoals_as_list(term::in, maybe1(list(goal))::out,
prog_varset::in, prog_varset::out) is det.
parse_atomic_subgoals_as_list(Term, MaybeGoals, !VarSet) :-
(
Term = term.functor(term.atom("or_else"), [LeftGoal, RightGoal], _)
->
parse_atomic_subgoals_as_list(LeftGoal, MaybeLeftGoalList, !VarSet),
parse_atomic_subgoals_as_list(RightGoal, MaybeRightGoalList, !VarSet),
(
MaybeLeftGoalList = ok1(LeftGoalList),
MaybeRightGoalList = ok1(RightGoalList)
->
MaybeGoals = ok1(LeftGoalList ++ RightGoalList)
;
LeftSpecs = get_any_errors1(MaybeLeftGoalList),
RightSpecs = get_any_errors1(MaybeRightGoalList),
MaybeGoals = error1(LeftSpecs ++ RightSpecs)
)
;
% XXX Provide better ContextPieces.
ContextPieces = [],
parse_goal(Term, ContextPieces, MaybeSubGoal, !VarSet),
(
MaybeSubGoal = ok1(SubGoal),
MaybeGoals = ok1([SubGoal])
;
MaybeSubGoal = error1(Specs),
MaybeGoals = error1(Specs)
)
).
%-----------------------------------------------------------------------------%
:- pred parse_lambda_arg(term::in, prog_term::out, mer_mode::out) is semidet.
parse_lambda_arg(Term, ArgTerm, Mode) :-
Term = term.functor(term.atom("::"), [ArgTerm0, ModeTerm], _),
term.coerce(ArgTerm0, ArgTerm),
convert_mode(allow_constrained_inst_var, ModeTerm, Mode0),
constrain_inst_vars_in_mode(Mode0, Mode).
%-----------------------------------------------------------------------------%
%
% Code for parsing pred/func expressions
%
parse_pred_expression(PredTerm, Groundness, lambda_normal, Args, Modes, Det) :-
PredTerm = term.functor(term.atom("is"), [PredArgsTerm, DetTerm], _),
DetTerm = term.functor(term.atom(DetString), [], _),
standard_det(DetString, Det),
PredArgsTerm = term.functor(term.atom(Name), PredArgsList, _),
(
Name = "pred",
Groundness = ho_ground
;
Name = "any_pred",
Groundness = ho_any
),
parse_pred_expr_args(PredArgsList, Args, Modes),
inst_var_constraints_are_self_consistent_in_modes(Modes).
parse_dcg_pred_expression(PredTerm, Groundness, lambda_normal, Args, Modes,
Det) :-
PredTerm = term.functor(term.atom("is"), [PredArgsTerm, DetTerm], _),
DetTerm = term.functor(term.atom(DetString), [], _),
standard_det(DetString, Det),
PredArgsTerm = term.functor(term.atom(Name), PredArgsList, _),
(
Name = "pred",
Groundness = ho_ground
;
Name = "any_pred",
Groundness = ho_any
),
parse_dcg_pred_expr_args(PredArgsList, Args, Modes),
inst_var_constraints_are_self_consistent_in_modes(Modes).
parse_func_expression(FuncTerm, Groundness, lambda_normal, Args, Modes, Det) :-
% Parse a func expression with specified modes and determinism.
FuncTerm = term.functor(term.atom("is"), [EqTerm, DetTerm], _),
EqTerm = term.functor(term.atom("="), [FuncArgsTerm, RetTerm], _),
DetTerm = term.functor(term.atom(DetString), [], _),
standard_det(DetString, Det),
FuncArgsTerm = term.functor(term.atom(Name), FuncArgsList, _),
(
Name = "func",
Groundness = ho_ground
;
Name = "any_func",
Groundness = ho_any
),
( parse_pred_expr_args(FuncArgsList, Args0, Modes0) ->
parse_lambda_arg(RetTerm, RetArg, RetMode),
list.append(Args0, [RetArg], Args),
list.append(Modes0, [RetMode], Modes),
inst_var_constraints_are_self_consistent_in_modes(Modes)
;
% The argument modes default to `in',
% the return mode defaults to `out'.
in_mode(InMode),
out_mode(OutMode),
list.length(FuncArgsList, NumArgs),
list.duplicate(NumArgs, InMode, Modes0),
RetMode = OutMode,
list.append(Modes0, [RetMode], Modes),
list.append(FuncArgsList, [RetTerm], Args1),
list.map(term.coerce, Args1, Args)
).
parse_func_expression(FuncTerm, Groundness, lambda_normal, Args, Modes, Det) :-
% Parse a func expression with unspecified modes and determinism.
FuncTerm = term.functor(term.atom("="), [FuncArgsTerm, RetTerm], _),
FuncArgsTerm = term.functor(term.atom(Name), Args0, _),
(
Name = "func",
Groundness = ho_ground
;
Name = "any_func",
Groundness = ho_any
),
% The argument modes default to `in', the return mode defaults to `out',
% and the determinism defaults to `det'.
in_mode(InMode),
out_mode(OutMode),
list.length(Args0, NumArgs),
list.duplicate(NumArgs, InMode, Modes0),
RetMode = OutMode,
Det = detism_det,
list.append(Modes0, [RetMode], Modes),
inst_var_constraints_are_self_consistent_in_modes(Modes),
list.append(Args0, [RetTerm], Args1),
list.map(term.coerce, Args1, Args).
:- pred parse_pred_expr_args(list(term)::in, list(prog_term)::out,
list(mer_mode)::out) is semidet.
parse_pred_expr_args([], [], []).
parse_pred_expr_args([Term | Terms], [Arg | Args], [Mode | Modes]) :-
parse_lambda_arg(Term, Arg, Mode),
parse_pred_expr_args(Terms, Args, Modes).
% parse_dcg_pred_expr_args is like parse_pred_expr_args except
% that the last two elements of the list are the modes of the
% two DCG arguments.
%
:- pred parse_dcg_pred_expr_args(list(term)::in, list(prog_term)::out,
list(mer_mode)::out) is semidet.
parse_dcg_pred_expr_args([DCGModeTermA, DCGModeTermB], [],
[DCGModeA, DCGModeB]) :-
convert_mode(allow_constrained_inst_var, DCGModeTermA, DCGModeA0),
convert_mode(allow_constrained_inst_var, DCGModeTermB, DCGModeB0),
constrain_inst_vars_in_mode(DCGModeA0, DCGModeA),
constrain_inst_vars_in_mode(DCGModeB0, DCGModeB).
parse_dcg_pred_expr_args([Term | Terms], [Arg | Args], [Mode | Modes]) :-
Terms = [_, _ | _],
parse_lambda_arg(Term, Arg, Mode),
parse_dcg_pred_expr_args(Terms, Args, Modes).
%-----------------------------------------------------------------------------%
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