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196a91d14a
Estimated hours taken: 1 Address some issues Fergus raised in his review of the record syntax documentation. compiler/make_hlds.m: tests/hard_coded/record_syntax.m: Change the syntax for DCG field extraction from `Value := ^ field' to `Value =^ field'. NEWS: doc/reference_manual.texi: Document the changed syntax. doc/reference_manual.texi: Clear up the description of how to construct higher-order terms for field access functions. library/ops.m: compiler/mercury_to_mercury.m: doc/transition_guide.texi: Add `=^' and `:=' to the operator table.
243 lines
12 KiB
Mathematica
243 lines
12 KiB
Mathematica
%---------------------------------------------------------------------------%
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% Copyright (C) 1995-2000 The University of Melbourne.
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% This file may only be copied under the terms of the GNU Library General
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% Public License - see the file COPYING.LIB in the Mercury distribution.
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%-----------------------------------------------------------------------------%
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%
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% file: ops.m.
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% main author: fjh.
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% stability: low.
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%
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% Here's where we maintain the table of current operators.
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%
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% XXX In the current implementation the table is fixed and cannot be
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% modified at run-time.
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%
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%-----------------------------------------------------------------------------%
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:- module ops.
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:- interface.
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:- type ops__specifier
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---> fx ; fy ; xf ; yf ; xfx ; yfx ; xfy ; fxx ; fxy ; fyx.
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:- type ops__assoc
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---> x ; y.
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:- type ops__class
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---> infix(ops__assoc, ops__assoc)
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; prefix(ops__assoc)
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; binary_prefix(ops__assoc, ops__assoc)
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; postfix(ops__assoc).
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:- type ops__table.
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:- type ops__priority == int.
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% create an ops_table with the standard Mercury operators.
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:- pred ops__init_op_table(ops__table).
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:- mode ops__init_op_table(uo) is det.
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% check whether a string is the name of an infix operator,
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% and if it is, return its precedence and associativity.
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:- pred ops__lookup_infix_op(ops__table, string, int, ops__assoc, ops__assoc).
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:- mode ops__lookup_infix_op(in, in, out, out, out) is semidet.
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% check whether a string is the name of a prefix operator,
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% and if it is, return its precedence and associativity.
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:- pred ops__lookup_prefix_op(ops__table, string, int, ops__assoc).
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:- mode ops__lookup_prefix_op(in, in, out, out) is semidet.
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% check whether a string is the name of a binary prefix operator,
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% and if it is, return its precedence and associativity.
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:- pred ops__lookup_binary_prefix_op(ops__table, string,
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int, ops__assoc, ops__assoc).
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:- mode ops__lookup_binary_prefix_op(in, in, out, out, out) is semidet.
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% check whether a string is the name of a postfix operator,
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% and if it is, return its precedence and associativity.
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:- pred ops__lookup_postfix_op(ops__table, string, int, ops__assoc).
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:- mode ops__lookup_postfix_op(in, in, out, out) is semidet.
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% check whether a string is the name of an operator
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:- pred ops__lookup_op(ops__table, string).
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:- mode ops__lookup_op(in, in) is semidet.
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% convert an ops__specifer (e.g. `xfy') to an ops__class
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% (e.g. `infix(x, y)').
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:- pred ops__op_specifier_to_class(ops__specifier, ops__class).
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:- mode ops__op_specifier_to_class(in, out) is det.
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% :- mode ops__op_specifier_to_class(out, in) is semidet.
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% Returns the highest priority number (the lowest is zero).
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% Note that due to Prolog tradition, the priority numbers
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% are backwards: higher numbers mean lower priority
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% and lower numbers mean higher priority. Sorry...
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:- pred ops__max_priority(ops__priority).
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:- mode ops__max_priority(out) is det.
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%-----------------------------------------------------------------------------%
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:- implementation.
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:- type ops__table ---> ops__table. % XXX
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:- type ops__category ---> before ; after.
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ops__op_specifier_to_class(fx, prefix(x)).
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ops__op_specifier_to_class(fy, prefix(y)).
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ops__op_specifier_to_class(xf, postfix(x)).
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ops__op_specifier_to_class(yf, postfix(y)).
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ops__op_specifier_to_class(xfx, infix(x,x)).
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ops__op_specifier_to_class(yfx, infix(y,x)).
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ops__op_specifier_to_class(xfy, infix(x,y)).
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ops__op_specifier_to_class(fxx, binary_prefix(x,x)).
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ops__op_specifier_to_class(fyx, binary_prefix(y,x)).
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ops__op_specifier_to_class(fxy, binary_prefix(x,y)).
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ops__lookup_infix_op(_OpTable, Name, Priority, LeftAssoc, RightAssoc) :-
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ops__op_table(Name, after, Specifier, Priority), !,
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ops__op_specifier_to_class(Specifier,
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infix(LeftAssoc, RightAssoc)).
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ops__lookup_prefix_op(_OpTable, Name, Priority, LeftAssoc) :-
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ops__op_table(Name, before, Specifier, Priority), !,
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ops__op_specifier_to_class(Specifier, prefix(LeftAssoc)).
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ops__lookup_binary_prefix_op(_OpTable, Name, Priority, LeftAssoc, RightAssoc) :-
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ops__op_table(Name, before, Specifier, Priority), !,
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ops__op_specifier_to_class(Specifier,
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binary_prefix(LeftAssoc, RightAssoc)).
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ops__lookup_postfix_op(_OpTable, Name, Priority, LeftAssoc) :-
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ops__op_table(Name, after, Specifier, Priority), !,
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ops__op_specifier_to_class(Specifier, postfix(LeftAssoc)).
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ops__lookup_op(_OpTable, Name) :-
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ops__op_table(Name, _, _, _).
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% Changes here may require changes to compiler/mercury_to_mercury.m
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% and doc/transition_guide.texi.
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:- pred ops__op_table(string, ops__category, ops__specifier, ops__priority).
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:- mode ops__op_table(in, in, out, out) is semidet.
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:- mode ops__op_table(in, out, out, out) is nondet.
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ops__op_table("*", after, yfx, 400). % standard ISO Prolog
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ops__op_table("**", after, xfy, 200). % standard ISO Prolog
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ops__op_table("+", after, yfx, 500). % standard ISO Prolog
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ops__op_table("+", before, fx, 500). % traditional Prolog (not ISO)
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ops__op_table(",", after, xfy, 1000). % standard ISO Prolog
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ops__op_table("&", after, xfy, 1025). % Mercury extension
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ops__op_table("-", after, yfx, 500). % standard ISO Prolog
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ops__op_table("-", before, fx, 200). % standard ISO Prolog
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ops__op_table("--->", after, xfy, 1179). % Mercury extension
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ops__op_table("-->", after, xfx, 1200). % standard ISO Prolog
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ops__op_table("->", after, xfy, 1050). % standard ISO Prolog
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ops__op_table(".", after, xfy, 600). % traditional Prolog (not ISO)
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ops__op_table("/", after, yfx, 400). % standard ISO Prolog
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ops__op_table("//", after, yfx, 400). % standard ISO Prolog
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ops__op_table("/\\", after, yfx, 500). % standard ISO Prolog
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ops__op_table(":", after, yfx, 600). % `xfy' in ISO Prolog
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ops__op_table(":-", after, xfx, 1200). % standard ISO Prolog
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ops__op_table(":-", before, fx, 1200). % standard ISO Prolog
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ops__op_table("::", after, xfx, 1175). % Mercury extension
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ops__op_table(":=", after, xfx, 650). % Mercury extension
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ops__op_table(";", after, xfy, 1100). % standard ISO Prolog
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ops__op_table("<", after, xfx, 700). % standard ISO Prolog
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ops__op_table("<<", after, yfx, 400). % standard ISO Prolog
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ops__op_table("<=", after, xfy, 920). % Mercury/NU-Prolog extension
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ops__op_table("<=>", after, xfy, 920). % Mercury/NU-Prolog extension
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ops__op_table("=", after, xfx, 700). % standard ISO Prolog
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ops__op_table("=..", after, xfx, 700). % standard ISO Prolog
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ops__op_table("=:=", after, xfx, 700). % standard ISO Prolog (*)
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ops__op_table("=<", after, xfx, 700). % standard ISO Prolog
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ops__op_table("==", after, xfx, 700). % standard ISO Prolog (*)
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ops__op_table("==>", after, xfx, 1175). % Mercury extension
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ops__op_table("=>", after, xfy, 920). % Mercury/NU-Prolog extension
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ops__op_table("=\\=", after, xfx, 700). % standard ISO Prolog (*)
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ops__op_table("=^", after, xfx, 650). % Mercury extension
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ops__op_table(">", after, xfx, 700). % standard ISO Prolog
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ops__op_table(">=", after, xfx, 700). % standard ISO Prolog
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ops__op_table(">>", after, yfx, 400). % standard ISO Prolog
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ops__op_table("?-", before, fx, 1200). % standard ISO Prolog (*)
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ops__op_table("@<", after, xfx, 700). % standard ISO Prolog
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ops__op_table("@=<", after, xfx, 700). % standard ISO Prolog
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ops__op_table("@>", after, xfx, 700). % standard ISO Prolog
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ops__op_table("@>=", after, xfx, 700). % standard ISO Prolog
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ops__op_table("\\", before, fx, 200). % standard ISO Prolog
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ops__op_table("\\+", before, fy, 900). % standard ISO Prolog
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ops__op_table("\\/", after, yfx, 500). % standard ISO Prolog
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ops__op_table("\\=", after, xfx, 700). % standard ISO Prolog
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ops__op_table("\\==", after, xfx, 700). % standard ISO Prolog (*)
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ops__op_table("^", after, xfy, 99). % ISO Prolog (prec. 200,
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% bitwise xor)
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% Mercury (record syntax)
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ops__op_table("^", before, fx, 100). % Mercury extension
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% (record syntax)
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ops__op_table("aditi_bottom_up", before, fx, 500). % Mercury extension
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ops__op_table("aditi_top_down", before, fx, 500). % Mercury extension
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ops__op_table("all", before, fxy, 950). % Mercury/NU-Prolog extension
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ops__op_table("and", after, xfy, 720). % NU-Prolog extension
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ops__op_table("div", after, yfx, 400). % standard ISO Prolog
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ops__op_table("else", after, xfy, 1170). % Mercury/NU-Prolog extension
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ops__op_table("end_module", before, fx, 1199). % Mercury extension
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ops__op_table("export_adt", before, fx, 1199). % Mercury extension (NYI)
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ops__op_table("export_cons", before, fx, 1199). % Mercury extension (NYI)
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ops__op_table("export_module", before, fx, 1199). % Mercury extension (NYI)
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ops__op_table("export_op", before, fx, 1199). % Mercury extension (NYI)
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ops__op_table("export_pred", before, fx, 1199). % Mercury extension (NYI)
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ops__op_table("export_sym", before, fx, 1199). % Mercury extension (NYI)
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ops__op_table("export_type", before, fx, 1199). % Mercury extension (NYI)
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ops__op_table("func", before, fx, 800). % Mercury extension
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ops__op_table("if", before, fx, 1160). % Mercury/NU-Prolog extension
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ops__op_table("import_adt", before, fx, 1199). % Mercury extension (NYI)
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ops__op_table("import_cons", before, fx, 1199). % Mercury extension (NYI)
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ops__op_table("import_module", before, fx, 1199). % Mercury extension
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ops__op_table("include_module", before, fx, 1199). % Mercury extension
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ops__op_table("import_op", before, fx, 1199). % Mercury extension (NYI)
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ops__op_table("import_pred", before, fx, 1199). % Mercury extension (NYI)
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ops__op_table("import_sym", before, fx, 1199). % Mercury extension (NYI)
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ops__op_table("import_type", before, fx, 1199). % Mercury extension (NYI)
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ops__op_table("impure", before, fy, 800). % Mercury extension
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ops__op_table("inst", before, fx, 1199). % Mercury extension
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ops__op_table("instance", before, fx, 1199). % Mercury extension
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ops__op_table("is", after, xfx, 701). % ISO Prolog says prec 700
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ops__op_table("lambda", before, fxy, 950). % Mercury extension
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ops__op_table("mod", after, xfx, 400). % Standard ISO Prolog
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ops__op_table("mode", before, fx, 1199). % Mercury extension
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ops__op_table("module", before, fx, 1199). % Mercury extension
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ops__op_table("not", before, fy, 900). % Mercury/NU-Prolog extension
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ops__op_table("or", after, xfy, 740). % NU-Prolog extension
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ops__op_table("pragma", before, fx, 1199). % Mercury extension
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ops__op_table("pred", before, fx, 800). % Mercury/NU-Prolog extension
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ops__op_table("promise", before, fx, 1199). % Mercury extension
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ops__op_table("rem", after, xfx, 400). % Standard ISO Prolog
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ops__op_table("rule", before, fx, 1199). % NU-Prolog extension
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ops__op_table("semipure", before, fy, 800). % Mercury extension
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ops__op_table("some", before, fxy, 950). % Mercury/NU-Prolog extension
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ops__op_table("then", after, xfx, 1150). % Mercury/NU-Prolog extension
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ops__op_table("type", before, fx, 1180). % Mercury extension
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ops__op_table("typeclass", before, fx, 1199). % Mercury extension
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ops__op_table("use_adt", before, fx, 1199). % Mercury extension (NYI)
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ops__op_table("use_cons", before, fx, 1199). % Mercury extension (NYI)
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ops__op_table("use_module", before, fx, 1199). % Mercury extension (NYI)
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ops__op_table("use_op", before, fx, 1199). % Mercury extension (NYI)
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ops__op_table("use_pred", before, fx, 1199). % Mercury extension (NYI)
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ops__op_table("use_sym", before, fx, 1199). % Mercury extension (NYI)
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ops__op_table("use_type", before, fx, 1199). % Mercury extension (NYI)
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ops__op_table("when", after, xfx, 900). % NU-Prolog extension (*)
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ops__op_table("where", after, xfx, 1175). % NU-Prolog extension (*)
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ops__op_table("~", before, fy, 900). % Goedel (*)
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ops__op_table("~=", after, xfx, 700). % NU-Prolog (*)
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% (*) means that the operator is not useful in Mercury
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% and is provided only for compatibility.
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% (NYI) means that the operator is reserved for some Not Yet Implemented
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% future purpose
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ops__init_op_table(ops__table).
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ops__max_priority(1200).
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%-----------------------------------------------------------------------------%
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