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507 lines
19 KiB
Mathematica
507 lines
19 KiB
Mathematica
%---------------------------------------------------------------------------%
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% vim: ts=4 sw=4 et ft=mercury
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%---------------------------------------------------------------------------%
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% Copyright (C) 2014 The Mercury team.
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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: string.to_string.m.
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%
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% This module implements the related predicates
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%
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% - string.string
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% - string.string_ops
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% - string.string_ops_noncanon
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%
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% which each convert a value of an arbitrary type to a string.
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%
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%---------------------------------------------------------------------------%
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:- module string.to_string.
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:- interface.
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:- import_module deconstruct.
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:- import_module ops.
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%---------------------------------------------------------------------------%
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:- func string_impl(T) = string.
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:- func string_ops_impl(ops.table, T) = string.
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:- pred string_ops_noncanon_impl(noncanon_handling, ops.table, T, string).
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:- mode string_ops_noncanon_impl(in(do_not_allow), in, in, out) is det.
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:- mode string_ops_noncanon_impl(in(canonicalize), in, in, out) is det.
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:- mode string_ops_noncanon_impl(in(include_details_cc), in, in, out)
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is cc_multi.
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:- mode string_ops_noncanon_impl(in, in, in, out) is cc_multi.
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%---------------------------------------------------------------------------%
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%---------------------------------------------------------------------------%
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:- implementation.
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:- import_module array.
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:- import_module bitmap.
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:- import_module int.
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:- import_module maybe.
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:- import_module pair.
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:- import_module std_util.
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:- import_module type_desc.
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:- import_module univ.
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:- import_module version_array.
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:- use_module rtti_implementation.
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:- use_module term_io.
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%---------------------------------------------------------------------------%
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string_impl(Univ) = String :-
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string_ops_noncanon_impl(canonicalize, ops.init_mercury_op_table,
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Univ, String).
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string_ops_impl(OpsTable, Univ) = String :-
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string_ops_noncanon_impl(canonicalize, OpsTable, Univ, String).
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string_ops_noncanon_impl(NonCanon, OpsTable, X, String) :-
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value_to_revstrings(NonCanon, OpsTable, X, [], RevStrings),
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String = string.append_list(list.reverse(RevStrings)).
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%---------------------------------------------------------------------------%
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% For efficiency, these predicates collect a list of strings which,
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% when concatenated in reverse order, produce the final output.
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%
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:- type revstrings == list(string).
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% Utility predicate.
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%
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:- pred add_revstring(string::in, revstrings::in, revstrings::out) is det.
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add_revstring(String, RevStrings, [String | RevStrings]).
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%---------------------------------------------------------------------------%
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:- pred value_to_revstrings(noncanon_handling, ops.table, T,
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revstrings, revstrings).
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:- mode value_to_revstrings(in(do_not_allow), in, in, in, out) is det.
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:- mode value_to_revstrings(in(canonicalize), in, in, in, out) is det.
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:- mode value_to_revstrings(in(include_details_cc), in, in, in, out)
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is cc_multi.
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:- mode value_to_revstrings(in, in, in, in, out) is cc_multi.
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value_to_revstrings(NonCanon, OpsTable, X, !Rs) :-
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Priority = ops.max_priority(OpsTable) + 1,
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value_to_revstrings_prio(NonCanon, OpsTable, Priority, X, !Rs).
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:- pred value_to_revstrings_prio(noncanon_handling, ops.table, ops.priority, T,
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revstrings, revstrings).
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:- mode value_to_revstrings_prio(in(do_not_allow), in, in, in, in, out) is det.
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:- mode value_to_revstrings_prio(in(canonicalize), in, in, in, in, out) is det.
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:- mode value_to_revstrings_prio(in(include_details_cc), in, in, in, in, out)
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is cc_multi.
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:- mode value_to_revstrings_prio(in, in, in, in, in, out) is cc_multi.
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value_to_revstrings_prio(NonCanon, OpsTable, Priority, X, !Rs) :-
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% We need to special-case the builtin types:
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% int, char, float, string
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% type_info, univ, c_pointer, array
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% and private_builtin.type_info
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( if dynamic_cast(X, String) then
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add_revstring(term_io.quoted_string(String), !Rs)
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else if dynamic_cast(X, Char) then
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add_revstring(term_io.quoted_char(Char), !Rs)
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else if dynamic_cast(X, Int) then
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add_revstring(string.int_to_string(Int), !Rs)
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else if dynamic_cast(X, Float) then
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add_revstring(string.float_to_string(Float), !Rs)
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else if dynamic_cast(X, Bitmap) then
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add_revstring(term_io.quoted_string(bitmap.to_string(Bitmap)), !Rs)
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else if dynamic_cast(X, TypeDesc) then
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type_desc_to_revstrings(TypeDesc, !Rs)
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else if dynamic_cast(X, TypeCtorDesc) then
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type_ctor_desc_to_revstrings(TypeCtorDesc, !Rs)
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else if dynamic_cast(X, C_Pointer) then
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add_revstring(c_pointer_to_string(C_Pointer), !Rs)
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else if
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% Check if the type is array.array/1. We cannot just use dynamic_cast
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% here since array.array/1 is a polymorphic type.
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%
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% The calls to type_ctor_name and type_ctor_module_name are not really
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% necessary -- we could use dynamic_cast in the condition instead of
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% det_dynamic_cast in the body. However, this way of doing things
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% is probably more efficient in the common case when the thing
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% being printed is *not* of type array.array/1.
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%
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% The ordering of the tests here (arity, then name, then module name,
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% rather than the reverse) is also chosen for efficiency, to find
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% failure cheaply in the common cases, rather than for readability.
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%
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type_ctor_and_args(type_of(X), TypeCtor, ArgTypes),
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ArgTypes = [ElemType],
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type_ctor_name(TypeCtor) = "array",
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type_ctor_module_name(TypeCtor) = "array"
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then
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% Now that we know the element type, we can constrain the type of
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% the variable `Array' so that we can use det_dynamic_cast.
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%
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has_type(Elem, ElemType),
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same_array_elem_type(Array, Elem),
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det_dynamic_cast(X, Array),
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array_to_revstrings(NonCanon, OpsTable, Array, !Rs)
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else if
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type_ctor_and_args(type_of(X), TypeCtor, ArgTypes),
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ArgTypes = [ElemType],
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type_ctor_name(TypeCtor) = "version_array",
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type_ctor_module_name(TypeCtor) = "version_array"
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then
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has_type(Elem, ElemType),
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same_version_array_elem_type(VersionArray, Elem),
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det_dynamic_cast(X, VersionArray),
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version_array_to_revstrings(NonCanon, OpsTable, VersionArray, !Rs)
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else if
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% Check if the type is private_builtin.type_info/1.
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% See the comments above for array.array/1.
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%
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type_ctor_and_args(type_of(X), TypeCtor, ArgTypes),
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ArgTypes = [ElemType],
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type_ctor_name(TypeCtor) = "type_info",
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type_ctor_module_name(TypeCtor) = "private_builtin"
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then
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has_type(Elem, ElemType),
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same_private_builtin_type(PrivateBuiltinTypeInfo, Elem),
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det_dynamic_cast(X, PrivateBuiltinTypeInfo),
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private_builtin_type_info_to_revstrings(PrivateBuiltinTypeInfo, !Rs)
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else
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ordinary_term_to_revstrings(NonCanon, OpsTable, Priority, X, !Rs)
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).
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:- pred same_array_elem_type(array(T)::unused, T::unused) is det.
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same_array_elem_type(_, _).
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:- pred same_version_array_elem_type(version_array(T)::unused, T::unused)
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is det.
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same_version_array_elem_type(_, _).
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:- pred same_private_builtin_type(private_builtin.type_info::unused,
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T::unused) is det.
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same_private_builtin_type(_, _).
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:- pred ordinary_term_to_revstrings(noncanon_handling, ops.table,
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ops.priority, T, revstrings, revstrings).
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:- mode ordinary_term_to_revstrings(in(do_not_allow), in, in, in, in, out)
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is det.
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:- mode ordinary_term_to_revstrings(in(canonicalize), in, in, in, in, out)
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is det.
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:- mode ordinary_term_to_revstrings(in(include_details_cc), in, in, in, in, out)
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is cc_multi.
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:- mode ordinary_term_to_revstrings(in, in, in, in, in, out)
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is cc_multi.
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ordinary_term_to_revstrings(NonCanon, OpsTable, Priority, X, !Rs) :-
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deconstruct(X, NonCanon, Functor, _Arity, Args),
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( if
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Functor = "[|]",
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Args = [ListHead, ListTail]
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then
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add_revstring("[", !Rs),
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arg_to_revstrings(NonCanon, OpsTable, ListHead, !Rs),
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univ_list_tail_to_revstrings(NonCanon, OpsTable, ListTail, !Rs),
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add_revstring("]", !Rs)
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else if
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Functor = "[]",
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Args = []
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then
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add_revstring("[]", !Rs)
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else if
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Functor = "{}"
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then
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(
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Args = [],
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add_revstring("{}", !Rs)
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;
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Args = [BracedTerm],
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add_revstring("{ ", !Rs),
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value_to_revstrings(NonCanon, OpsTable, univ_value(BracedTerm),
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!Rs),
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add_revstring(" }", !Rs)
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;
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Args = [BracedHead | BracedTail],
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BracedTail = [_ | _],
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add_revstring("{", !Rs),
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arg_to_revstrings(NonCanon, OpsTable, BracedHead, !Rs),
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term_args_to_revstrings(NonCanon, OpsTable, BracedTail, !Rs),
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add_revstring("}", !Rs)
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)
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else if
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Args = [Arg]
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then
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( if
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ops.lookup_prefix_op(OpsTable, Functor, OpPriority, OpAssoc)
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then
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maybe_add_revstring("(", Priority, OpPriority, !Rs),
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add_revstring(term_io.quoted_atom(Functor), !Rs),
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add_revstring(" ", !Rs),
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adjust_priority(OpPriority, OpAssoc, NewPriority),
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value_to_revstrings_prio(NonCanon, OpsTable, NewPriority,
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univ_value(Arg), !Rs),
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maybe_add_revstring(")", Priority, OpPriority, !Rs)
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else if
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ops.lookup_postfix_op(OpsTable, Functor, OpPriority, OpAssoc)
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then
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maybe_add_revstring("(", Priority, OpPriority, !Rs),
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adjust_priority(OpPriority, OpAssoc, NewPriority),
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value_to_revstrings_prio(NonCanon, OpsTable, NewPriority,
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univ_value(Arg), !Rs),
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add_revstring(" ", !Rs),
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add_revstring(term_io.quoted_atom(Functor), !Rs),
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maybe_add_revstring(")", Priority, OpPriority, !Rs)
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else
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plain_term_to_revstrings(NonCanon, OpsTable, Priority,
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Functor, Args, !Rs)
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)
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else if
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Args = [Arg1, Arg2]
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then
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( if
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ops.lookup_infix_op(OpsTable, Functor, OpPriority,
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LeftAssoc, RightAssoc)
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then
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maybe_add_revstring("(", Priority, OpPriority, !Rs),
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adjust_priority(OpPriority, LeftAssoc, LeftPriority),
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value_to_revstrings_prio(NonCanon, OpsTable, LeftPriority,
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univ_value(Arg1), !Rs),
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( if Functor = "," then
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add_revstring(", ", !Rs)
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else
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add_revstring(" ", !Rs),
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add_revstring(term_io.quoted_atom(Functor), !Rs),
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add_revstring(" ", !Rs)
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),
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adjust_priority(OpPriority, RightAssoc, RightPriority),
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value_to_revstrings_prio(NonCanon, OpsTable, RightPriority,
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univ_value(Arg2), !Rs),
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maybe_add_revstring(")", Priority, OpPriority, !Rs)
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else if
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ops.lookup_binary_prefix_op(OpsTable, Functor,
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OpPriority, FirstAssoc, SecondAssoc)
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then
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maybe_add_revstring("(", Priority, OpPriority, !Rs),
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add_revstring(term_io.quoted_atom(Functor), !Rs),
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add_revstring(" ", !Rs),
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adjust_priority(OpPriority, FirstAssoc, FirstPriority),
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value_to_revstrings_prio(NonCanon, OpsTable, FirstPriority,
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univ_value(Arg1), !Rs),
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add_revstring(" ", !Rs),
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adjust_priority(OpPriority, SecondAssoc, SecondPriority),
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value_to_revstrings_prio(NonCanon, OpsTable, SecondPriority,
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univ_value(Arg2), !Rs),
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maybe_add_revstring(")", Priority, OpPriority, !Rs)
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else
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plain_term_to_revstrings(NonCanon, OpsTable, Priority,
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Functor, Args, !Rs)
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)
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else
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plain_term_to_revstrings(NonCanon, OpsTable, Priority, Functor, Args,
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!Rs)
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).
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:- pred plain_term_to_revstrings(noncanon_handling, ops.table,
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ops.priority, string, list(univ), revstrings, revstrings).
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:- mode plain_term_to_revstrings(in(do_not_allow), in, in, in, in, in, out)
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is det.
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:- mode plain_term_to_revstrings(in(canonicalize), in, in, in, in, in, out)
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is det.
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:- mode plain_term_to_revstrings(in(include_details_cc), in, in, in, in,
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in, out) is cc_multi.
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:- mode plain_term_to_revstrings(in, in, in, in, in, in, out)
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is cc_multi.
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plain_term_to_revstrings(NonCanon, OpsTable, Priority, Functor, Args, !Rs) :-
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( if
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Args = [],
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ops.lookup_op(OpsTable, Functor),
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Priority =< ops.max_priority(OpsTable)
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then
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add_revstring("(", !Rs),
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add_revstring(term_io.quoted_atom(Functor), !Rs),
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add_revstring(")", !Rs)
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else
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add_revstring(
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term_io.quoted_atom_agt(Functor,
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term_io.maybe_adjacent_to_graphic_token),
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!Rs
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)
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),
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(
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Args = [Y | Ys],
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add_revstring("(", !Rs),
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arg_to_revstrings(NonCanon, OpsTable, Y, !Rs),
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term_args_to_revstrings(NonCanon, OpsTable, Ys, !Rs),
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add_revstring(")", !Rs)
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;
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Args = []
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).
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:- pred maybe_add_revstring(string::in, ops.priority::in, ops.priority::in,
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revstrings::in, revstrings::out) is det.
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maybe_add_revstring(String, Priority, OpPriority, !Rs) :-
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( if OpPriority > Priority then
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add_revstring(String, !Rs)
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else
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true
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).
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:- pred adjust_priority(ops.priority::in, ops.assoc::in, ops.priority::out)
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is det.
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adjust_priority(Priority, ops.y, Priority).
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adjust_priority(Priority, ops.x, Priority - 1).
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:- pred univ_list_tail_to_revstrings(noncanon_handling, ops.table, univ,
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revstrings, revstrings).
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:- mode univ_list_tail_to_revstrings(in(do_not_allow), in, in, in, out) is det.
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:- mode univ_list_tail_to_revstrings(in(canonicalize), in, in, in, out) is det.
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:- mode univ_list_tail_to_revstrings(in(include_details_cc), in, in, in, out)
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is cc_multi.
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:- mode univ_list_tail_to_revstrings(in, in, in, in, out) is cc_multi.
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univ_list_tail_to_revstrings(NonCanon, OpsTable, Univ, !Rs) :-
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deconstruct(univ_value(Univ), NonCanon, Functor, _Arity, Args),
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( if
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Functor = "[|]",
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Args = [ListHead, ListTail]
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then
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add_revstring(", ", !Rs),
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arg_to_revstrings(NonCanon, OpsTable, ListHead, !Rs),
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univ_list_tail_to_revstrings(NonCanon, OpsTable, ListTail, !Rs)
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else if
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Functor = "[]",
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Args = []
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then
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true
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else
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add_revstring(" | ", !Rs),
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value_to_revstrings(NonCanon, OpsTable, univ_value(Univ), !Rs)
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).
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% Write the remaining arguments.
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%
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:- pred term_args_to_revstrings(noncanon_handling, ops.table, list(univ),
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revstrings, revstrings).
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:- mode term_args_to_revstrings(in(do_not_allow), in, in, in, out) is det.
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:- mode term_args_to_revstrings(in(canonicalize), in, in, in, out) is det.
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:- mode term_args_to_revstrings(in(include_details_cc), in, in, in, out)
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is cc_multi.
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:- mode term_args_to_revstrings(in, in, in, in, out) is cc_multi.
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term_args_to_revstrings(_, _, [], !Rs).
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term_args_to_revstrings(NonCanon, OpsTable, [X | Xs], !Rs) :-
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add_revstring(", ", !Rs),
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arg_to_revstrings(NonCanon, OpsTable, X, !Rs),
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term_args_to_revstrings(NonCanon, OpsTable, Xs, !Rs).
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:- pred arg_to_revstrings(noncanon_handling,
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ops.table, univ, revstrings, revstrings).
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:- mode arg_to_revstrings(in(do_not_allow), in, in, in, out) is det.
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:- mode arg_to_revstrings(in(canonicalize), in, in, in, out) is det.
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:- mode arg_to_revstrings(in(include_details_cc), in, in, in, out) is cc_multi.
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:- mode arg_to_revstrings(in, in, in, in, out) is cc_multi.
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arg_to_revstrings(NonCanon, OpsTable, X, !Rs) :-
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Priority = comma_priority(OpsTable),
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value_to_revstrings_prio(NonCanon, OpsTable, Priority, univ_value(X), !Rs).
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:- func comma_priority(ops.table) = ops.priority.
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% comma_priority(OpsTable) =
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% ( if ops.lookup_infix_op(OpTable, ",", Priority, _, _) then
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% Priority
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% else
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% func_error("arg_priority: cannot find the priority of `,'")
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% ).
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% We could implement this as above, but it is more efficient to just
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% hard-code it.
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comma_priority(_OpTable) = 1000.
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:- pred array_to_revstrings(noncanon_handling, ops.table, array(T),
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revstrings, revstrings).
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:- mode array_to_revstrings(in(do_not_allow), in, in, in, out) is det.
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:- mode array_to_revstrings(in(canonicalize), in, in, in, out) is det.
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|
:- mode array_to_revstrings(in(include_details_cc), in, in, in, out)
|
|
is cc_multi.
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|
:- mode array_to_revstrings(in, in, in, in, out) is cc_multi.
|
|
|
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array_to_revstrings(NonCanon, OpsTable, Array, !Rs) :-
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add_revstring("array(", !Rs),
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value_to_revstrings(NonCanon, OpsTable,
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|
array.to_list(Array) `with_type` list(T), !Rs),
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add_revstring(")", !Rs).
|
|
|
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:- pred version_array_to_revstrings(noncanon_handling, ops.table,
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|
version_array(T), revstrings, revstrings).
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|
:- mode version_array_to_revstrings(in(do_not_allow), in, in, in, out) is det.
|
|
:- mode version_array_to_revstrings(in(canonicalize), in, in, in, out) is det.
|
|
:- mode version_array_to_revstrings(in(include_details_cc), in, in, in, out)
|
|
is cc_multi.
|
|
:- mode version_array_to_revstrings(in, in, in, in, out) is cc_multi.
|
|
|
|
version_array_to_revstrings(NonCanon, OpsTable, Array, !Rs) :-
|
|
add_revstring("version_array(", !Rs),
|
|
value_to_revstrings(NonCanon, OpsTable,
|
|
version_array.to_list(Array) `with_type` list(T), !Rs),
|
|
add_revstring(")", !Rs).
|
|
|
|
:- pred type_desc_to_revstrings(type_desc::in,
|
|
revstrings::in, revstrings::out) is det.
|
|
|
|
type_desc_to_revstrings(TypeDesc, !Rs) :-
|
|
add_revstring(term_io.quoted_atom(type_name(TypeDesc)), !Rs).
|
|
|
|
:- pred type_ctor_desc_to_revstrings(type_ctor_desc::in,
|
|
revstrings::in, revstrings::out) is det.
|
|
|
|
type_ctor_desc_to_revstrings(TypeCtorDesc, !Rs) :-
|
|
type_desc.type_ctor_name_and_arity(TypeCtorDesc, ModuleName,
|
|
Name0, Arity0),
|
|
Name = term_io.quoted_atom(Name0),
|
|
( if
|
|
ModuleName = "builtin",
|
|
Name = "func"
|
|
then
|
|
% The type ctor that we call `builtin.func/N' takes N + 1 type
|
|
% parameters: N arguments plus one return value. So we need to subtract
|
|
% one from the arity here.
|
|
Arity = Arity0 - 1
|
|
else
|
|
Arity = Arity0
|
|
),
|
|
( if ModuleName = "builtin" then
|
|
String = string.format("%s/%d", [s(Name), i(Arity)])
|
|
else
|
|
String = string.format("%s.%s/%d", [s(ModuleName), s(Name), i(Arity)])
|
|
),
|
|
add_revstring(String, !Rs).
|
|
|
|
:- pred private_builtin_type_info_to_revstrings(
|
|
private_builtin.type_info::in, revstrings::in, revstrings::out) is det.
|
|
|
|
private_builtin_type_info_to_revstrings(PrivateBuiltinTypeInfo, !Rs) :-
|
|
private_builtin.unsafe_type_cast(PrivateBuiltinTypeInfo, TypeInfo),
|
|
type_desc.type_info_to_type_desc(TypeInfo, TypeDesc),
|
|
type_desc_to_revstrings(TypeDesc, !Rs).
|
|
|
|
:- pred det_dynamic_cast(T1::in, T2::out) is det.
|
|
|
|
det_dynamic_cast(X, Y) :-
|
|
det_univ_to_type(univ(X), Y).
|
|
|
|
%---------------------------------------------------------------------------%
|