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lalr1.cc: don't generate location.hh when location_type is defined

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* data/bison.m4 (b4_percent_define_get): Accept a default value.
	* data/c++.m4: Do not provide a default value for the %define
	variable location_type, rather, use b4_percent_define_get with a
	default argument where its value is needed.
	* data/lalr1.cc: Do not load location.cc (which outputs both
	location.hh and position.hh) if the user defined location_type.
	Do not include location.hh either.
This commit is contained in:
Akim Demaille
2010-04-14 17:56:38 +02:00
parent 19ad326be4
commit 7789b6e3e7
4 changed files with 33 additions and 12 deletions
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13
data/bison.m4
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@@ -563,10 +563,11 @@ m4_define([b4_percent_define_use],
[m4_define([b4_percent_define_bison_variables(]$1[)])dnl
])
# b4_percent_define_get(VARIABLE)
# -------------------------------
# Mimic muscle_percent_define_get in ../src/muscle-tab.h exactly. That is, if
# the %define variable VARIABLE is defined, emit its value. Also, record
# b4_percent_define_get(VARIABLE, [DEFAULT])
# ------------------------------------------
# Mimic muscle_percent_define_get in ../src/muscle-tab.h. That is, if
# the %define variable VARIABLE is defined, emit its value. Contrary
# to its C counterpart, return DEFAULT otherwise. Also, record
# Bison's usage of VARIABLE by defining
# b4_percent_define_bison_variables(VARIABLE).
#
@@ -575,7 +576,9 @@ m4_define([b4_percent_define_use],
# b4_percent_define_get([[foo]])
m4_define([b4_percent_define_get],
[b4_percent_define_use([$1])dnl
m4_ifdef([b4_percent_define(]$1[)], [m4_indir([b4_percent_define(]$1[)])])])
m4_ifdef([b4_percent_define(]$1[)],
[m4_indir([b4_percent_define(]$1[)])],
[$2])])
# b4_percent_define_get_loc(VARIABLE)
# -----------------------------------

10
data/c++.m4
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@@ -24,7 +24,12 @@ m4_include(b4_pkgdatadir/[c.m4])
## ---------------- ##
b4_percent_define_default([[parser_class_name]], [[parser]])
b4_percent_define_default([[location_type]], [[location]])
# Don't do that so that we remember whether we're using a user
# request, or the default value.
#
# b4_percent_define_default([[location_type]], [[location_type]])
b4_percent_define_default([[filename_type]], [[std::string]])
b4_percent_define_default([[api.namespace]], m4_defn([b4_prefix]))
@@ -123,7 +128,8 @@ m4_define([b4_public_types_declare],
typedef YYSTYPE semantic_type;
#endif]b4_locations_if([
/// Symbol locations.
typedef b4_percent_define_get([[location_type]]) location_type;])[
typedef b4_percent_define_get([[location_type]],
[[location]]) location_type;])[
/// Syntax errors thrown from user actions.
struct syntax_error : std::runtime_error

11
data/lalr1.cc
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@@ -124,10 +124,10 @@ m4_define([b4_parser_class_name],
b4_defines_if([],
[b4_fatal([b4_skeleton[: using %%defines is mandatory]])])
b4_locations_if(
[# Backward compatibility.
m4_define([b4_location_constructors])
m4_include(b4_pkgdatadir/[location.cc])])
b4_locations_if([b4_percent_define_ifdef([[location_type]], [],
[# Backward compatibility.
m4_define([b4_location_constructors])
m4_include(b4_pkgdatadir/[location.cc])])])
m4_include(b4_pkgdatadir/[stack.hh])
b4_variant_if([m4_include(b4_pkgdatadir/[variant.hh])])
@@ -149,8 +149,9 @@ dnl FIXME: This is wrong, we want computed header guards.
#include <stdexcept>
#include <string>
#include <iostream>
]b4_locations_if([#include "location.hh"])[
#include "stack.hh"
]b4_locations_if([b4_percent_define_ifdef([[location_type]], [],
[[#include "location.hh"]])])[
]b4_variant_if([b4_namespace_open
b4_variant_define