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api.value.type: implement proper support, check, and document

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* data/c.m4 (b4_symbol_type_register, b4_type_define_tag)
(b4_symbol_value_union, b4_value_type_setup_union)
(b4_value_type_setup_variant, b4_value_type_setup):
New.
(b4_value_type_define): Use it to set up properly the type.
Handle the various possible values of api.value.type.
* data/c++.m4 (b4_value_type_declare): Likewise.
* data/lalr1.cc (b4_value_type_setup_variant): Redefine.

* tests/types.at: New.
Exercise all the C/C++ skeletons with different types of
api.value.type values.
* tests/local.mk, tests/testsuite.at: Use it.

* doc/bison.texi (%define Summary): Document api.value.type.
* NEWS: Advertise it, together with api.token.constructor.
This commit is contained in:
Akim Demaille
2013-02-08 17:17:33 +01:00
parent dde95ca432
commit 6574576cfb
9 changed files with 463 additions and 25 deletions
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12
data/bison.m4
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@@ -361,6 +361,7 @@ b4_define_flag_if([yacc]) # Whether POSIX Yacc is emulated.
# Whether the symbol has an id.
# - id: string
# If has_id, the id. Guaranteed to be usable as a C identifier.
# Prefixed by api.token.prefix if defined.
# - tag: string.
# A representat of the symbol. Can be 'foo', 'foo.id', '"foo"' etc.
# - user_number: integer
@@ -371,9 +372,13 @@ b4_define_flag_if([yacc]) # Whether POSIX Yacc is emulated.
# The internalized number (used after yytranslate).
# - has_type: 0, 1
# Whether has a semantic value.
# - type_tag: string
# When api.value.type=union, the generated name for the union member.
# yytype_INT etc. for symbols that has_id, otherwise yytype_1 etc.
# - type
# If it has a semantic value, its type tag, or, if variant are used,
# its type.
# In the case of api.value.type=union, type is the real type (e.g. int).
# - has_printer: 0, 1
# - printer: string
# - printer_file: string
@@ -962,3 +967,10 @@ b4_percent_define_ifdef([api.prefix],
[['%s' and '%s' cannot be used together]],
[%name-prefix],
[%define api.prefix])])])
b4_percent_define_ifdef([api.value.type],
[m4_ifdef([b4_union_members],
[b4_complain_at(b4_percent_define_get_loc([api.value.type]),
[['%s' and '%s' cannot be used together]],
[%union],
[%define api.value.type])])])