# Language-independent M4 Macros for Bison.
-# Copyright (C) 2002, 2004-2012 Free Software Foundation, Inc.
+# Copyright (C) 2002, 2004-2013 Free Software Foundation, Inc.
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
])
+# b4_divert_kill(CODE)
+# --------------------
+# Expand CODE for its side effects, discard its output.
+m4_define([b4_divert_kill],
+[m4_divert_text([KILL], [$1])])
+
+
+# b4_define_silent(MACRO, CODE)
+# -----------------------------
+# Same as m4_define, but throw away the expansion of CODE.
+m4_define([b4_define_silent],
+[m4_define([$1], [b4_divert_kill([$2])])])
+
+
## ---------------- ##
## Error handling. ##
## ---------------- ##
STATE-NUM.]])
$1([defact], [b4_defact],
- [[YYDEFACT[S] -- default reduction number in state S. Performed when
-YYTABLE does not specify something else to do. Zero means the default
-is an error.]])
+ [[YYDEFACT[STATE-NUM] -- Default reduction number in state STATE-NUM.
+Performed when YYTABLE does not specify something else to do. Zero
+means the default is an error.]])
$1([pgoto], [b4_pgoto], [[YYPGOTO[NTERM-NUM].]])
$1([defgoto], [b4_defgoto], [[YYDEFGOTO[NTERM-NUM].]])
$1([table], [b4_table],
- [[YYTABLE[YYPACT[STATE-NUM]]. What to do in state STATE-NUM. If
-positive, shift that token. If negative, reduce the rule which
+ [[YYTABLE[YYPACT[STATE-NUM]] -- What to do in state STATE-NUM. If
+positive, shift that token. If negative, reduce the rule whose
number is the opposite. If YYTABLE_NINF, syntax error.]])
$1([check], [b4_check])
$1([stos], [b4_stos],
- [[STOS_[STATE-NUM] -- The (internal number of the) accessing
+ [[YYSTOS[STATE-NUM] -- The (internal number of the) accessing
symbol of state STATE-NUM.]])
$1([r1], [b4_r1],
[[YYR1[YYN] -- Symbol number of symbol that rule YYN derives.]])
$1([r2], [b4_r2],
- [[YYR2[YYN] -- Number of symbols composing right hand side of rule YYN.]])
+ [[YYR2[YYN] -- Number of symbols on the right hand side of rule YYN.]])
])
# _b4_define_flag_if($1, $2, FLAG)
# --------------------------------
# Work around the impossibility to define macros inside macros,
-# because issuing `[$1]' is not possible in M4. GNU M4 should provide
+# because issuing '[$1]' is not possible in M4. GNU M4 should provide
# $$1 a la M5/TeX.
m4_define([_b4_define_flag_if],
[m4_if([$1$2], $[1]$[2], [],
# 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
# 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
b4_symbol_if([$1], [has_type],
[m4_dquote(b4_symbol([$1], [type]))]),
[(*yylocationp)])dnl
- b4_symbol_case_([$1])[]dnl
+ b4_symbol_case_([$1])[]dnl
b4_syncline([b4_symbol([$1], [$2_line])], ["b4_symbol([$1], [$2_file])"])
- b4_symbol([$1], [$2])
+ b4_symbol([$1], [$2])
b4_syncline([@oline@], [@ofile@])
break;
m4_define([b4_symbol_printer], [b4_symbol_action([$1], [printer])])
+# b4_symbol_actions(KIND, [TYPE = yytype])
+# ----------------------------------------
+# Emit the symbol actions for KIND ("printer" or "destructor").
+# Dispatch on TYPE.
+m4_define([b4_symbol_actions],
+[m4_pushdef([b4_actions_], m4_expand([b4_symbol_foreach([b4_symbol_$1])]))dnl
+m4_ifval(m4_defn([b4_actions_]),
+[switch (m4_default([$2], [yytype]))
+ {
+ m4_defn([b4_actions_])
+ default:
+ break;
+ }dnl
+],
+[YYUSE (m4_default([$2], [yytype]));])dnl
+m4_popdef([b4_actions_])dnl
+])
+
# b4_symbol_case_(SYMBOL-NUM)
# ---------------------------
# Issue a "case NUM" for SYMBOL-NUM.
m4_define([b4_symbol_case_],
-[ case b4_symbol([$1], [number]): // b4_symbol([$1], [tag])
+[case b4_symbol([$1], [number]): b4_symbol_tag_comment([$1])])
])
# TAG, TYPE).
m4_define([b4_type_action_],
[b4_symbol_if([$1], [has_type],
-[m4_map([b4_symbol_case_], [$@])[]dnl
+[m4_map([ b4_symbol_case_], [$@])[]dnl
b4_dollar_dollar([b4_symbol([$1], [number])],
[b4_symbol([$1], [tag])],
[b4_symbol([$1], [type])]);
# -----------------------
m4_define([b4_syncline],
[b4_flag_if([synclines],
-[b4_sync_end([__line__], [b4_basename(m4_quote(__file__))])
-b4_sync_start([$1], [$2])])])
+[b4_sync_start([$1], [$2]) b4_sync_end([__line__],
+ [b4_basename(m4_quote(__file__))])[]dnl
+])])
+
+# b4_sync_start(LINE, FILE)
+# -----------------------
+# Syncline for the new place. Typically a directive for the compiler.
+m4_define([b4_sync_start], [b4_comment([$2:$1])])
+
+# b4_sync_end(LINE, FILE)
+# -----------------------
+# Syncline for the current place, which ends. Typically a comment
+# left for the reader.
+m4_define([b4_sync_end], [b4_comment([$2:$1])])
-m4_define([b4_sync_end], [b4_comment([Line $1 of $2])])
-m4_define([b4_sync_start], [b4_comment([Line $1 of $2])])
# b4_user_code(USER-CODE)
# -----------------------
# b4_user_initial_action
# b4_user_post_prologue
# b4_user_pre_prologue
-# b4_user_stype
+# b4_user_union_members
# ----------------------
# Macros that issue user code, ending with synclines.
b4_define_user_code([actions])
b4_define_user_code([initial_action])
b4_define_user_code([post_prologue])
b4_define_user_code([pre_prologue])
-b4_define_user_code([stype])
+b4_define_user_code([union_members])
# b4_check_user_names(WHAT, USER-LIST, BISON-NAMESPACE)
[m4_pushdef([b4_loc], m4_indir([b4_percent_define_loc(]$1[)]))dnl
b4_loc[]dnl
m4_popdef([b4_loc])],
- [b4_fatal([[b4_percent_define_get_loc: undefined %%define variable '%s']], [$1])])])
+ [b4_fatal([[$0: undefined %%define variable '%s']], [$1])])])
+
+# b4_percent_define_get_kind(VARIABLE)
+# ------------------------------------
+# Get the kind (code, keyword, string) of VARIABLE, i.e., how its
+# value was defined (braces, not delimiters, quotes).
+#
+# If the %define variable VARIABLE is undefined, complain fatally
+# since that's a Bison or skeleton error. Don't record this as a
+# Bison usage of VARIABLE as there's no reason to suspect that the
+# user-supplied value has yet influenced the output.
+m4_define([b4_percent_define_get_kind],
+[m4_ifdef([b4_percent_define_kind(]$1[)],
+ [m4_indir([b4_percent_define_kind(]$1[)])],
+ [b4_fatal([[$0: undefined %%define variable '%s']], [$1])])])
# b4_percent_define_get_syncline(VARIABLE)
# ----------------------------------------
m4_define([b4_percent_define_get_syncline],
[m4_ifdef([b4_percent_define_syncline(]$1[)],
[m4_indir([b4_percent_define_syncline(]$1[)])],
- [b4_fatal([[b4_percent_define_get_syncline: undefined %%define variable '%s']], [$1])])])
+ [b4_fatal([[$0: undefined %%define variable '%s']], [$1])])])
# b4_percent_define_ifdef(VARIABLE, IF-TRUE, [IF-FALSE])
# ------------------------------------------------------
[[invalid value for %%define Boolean variable '%s']],
[$1])],
[[b4_percent_define_flag_if($1)]])])],
- [b4_fatal([[b4_percent_define_flag_if: undefined %%define variable '%s']], [$1])])])
+ [b4_fatal([[$0: undefined %%define variable '%s']], [$1])])])
# b4_percent_define_default(VARIABLE, DEFAULT)
# b4_percent_define_if_define(NAME, [VARIABLE = NAME])
# ----------------------------------------------------
# Define b4_NAME_if that executes its $1 or $2 depending whether
-# VARIABLE was %defined. The characters `.' and `-' in VARIABLE are mapped
-# to `_'.
+# VARIABLE was %defined. The characters '.' and `-' in VARIABLE are mapped
+# to '_'.
m4_define([b4_percent_define_if_define_],
[m4_define(m4_bpatsubst([b4_$1_if], [[-.]], [_]),
[b4_percent_define_flag_if(m4_default([$2], [$1]),
[[accepted value: '%s']],
m4_dquote(b4_value))])])dnl
m4_popdef([b4_good_value])],
- [b4_fatal([[b4_percent_define_check_values: undefined %%define variable '%s']], [$1])])])
+ [b4_fatal([[$0: undefined %%define variable '%s']], [$1])])])
# b4_percent_code_get([QUALIFIER])
# --------------------------------
# b4_variant_if([IF-VARIANT-ARE-USED], [IF-NOT])
# ----------------------------------------------
b4_percent_define_if_define([variant])
-m4_case(b4_percent_define_get([[api.value.type]]),
- [variant], [m4_define([b4_variant_flag], [[1]])],
- [m4_define([b4_variant_flag], [[0]])])
+m4_define([b4_variant_flag], [[0]])
+b4_percent_define_ifdef([[api.value.type]],
+ [m4_case(b4_percent_define_get_kind([[api.value.type]]), [keyword],
+ [m4_case(b4_percent_define_get([[api.value.type]]), [variant],
+ [m4_define([b4_variant_flag], [[1]])])])])
b4_define_flag_if([variant])
m4_define_default([b4_location_initial_column], [1])
m4_define_default([b4_location_initial_line], [1])
-# Sanity checks.
+
+## --------------- ##
+## Sanity checks. ##
+## --------------- ##
+
+# api.prefix >< %name-prefix.
b4_percent_define_ifdef([api.prefix],
[m4_ifdef([b4_prefix],
[b4_complain_at(b4_percent_define_get_loc([api.prefix]),
[['%s' and '%s' cannot be used together]],
[%name-prefix],
[%define api.prefix])])])
+
+# api.value.type >< %union.
+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])])])
+
+# api.value.type=union >< %yacc.
+b4_percent_define_ifdef([api.value.type],
+[m4_if(b4_percent_define_get([api.value.type]), [union],
+[b4_yacc_if(dnl
+[b4_complain_at(b4_percent_define_get_loc([api.value.type]),
+ [['%s' and '%s' cannot be used together]],
+ [%yacc],
+ [%define api.value.type "union"])])])])
projects / bison.git / blobdiff