# 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
version 2.2 of Bison.])])
+## -------- ##
+## Output. ##
+## -------- ##
+
+# b4_output_begin(FILE)
+# ---------------------
+# Enable output, i.e., send to diversion 0, expand after "#", and
+# generate the tag to output into FILE. Must be followed by EOL.
+m4_define([b4_output_begin],
+[m4_changecom()
+m4_divert_push(0)dnl
+@output(m4_unquote([$1])@)@dnl
+])
+
+
+# b4_output_end()
+# ---------------
+# Output nothing, restore # as comment character (no expansions after #).
+m4_define([b4_output_end],
+[m4_divert_pop(0)
+m4_changecom([#])
+])
+
+
## ---------------- ##
## Error handling. ##
## ---------------- ##
])dnl
m4_if(m4_sysval, [0], [], [m4_fatal([$0: cannot write to stdout])])])
-# b4_error(KIND, FORMAT, [ARG1], [ARG2], ...)
-# -------------------------------------------
-# Write @KIND(FORMAT@,ARG1@,ARG2@,...@) to stdout.
+# b4_error(KIND, START, END, FORMAT, [ARG1], [ARG2], ...)
+# -------------------------------------------------------
+# Write @KIND(START@,END@,FORMAT@,ARG1@,ARG2@,...@) to stdout.
#
# For example:
#
-# b4_error([[warn]], [[invalid value for '%s': %s]], [[foo]], [[3]])
+# b4_error([[complain]], [[input.y:2.3]], [[input.y:5.4]],
+# [[invalid %s]], [[foo]])
m4_define([b4_error],
-[b4_cat([[@]$1[(]$2[]]dnl
-[m4_if([$#], [2], [],
- [m4_foreach([b4_arg],
- m4_dquote(m4_shift(m4_shift($@))),
- [[@,]b4_arg])])[@)]])])
-
-# b4_error_at(KIND, START, END, FORMAT, [ARG1], [ARG2], ...)
-# ----------------------------------------------------------
-# Write @KIND_at(START@,END@,FORMAT@,ARG1@,ARG2@,...@) to stdout.
-#
-# For example:
-#
-# b4_error_at([[complain]], [[input.y:2.3]], [[input.y:5.4]],
-# [[invalid %s]], [[foo]])
-m4_define([b4_error_at],
-[b4_cat([[@]$1[_at(]$2[@,]$3[@,]$4[]]dnl
+[b4_cat([[@complain][(]$1[@,]$2[@,]$3[@,]$4[]]dnl
[m4_if([$#], [4], [],
[m4_foreach([b4_arg],
m4_dquote(m4_shift(m4_shift(m4_shift(m4_shift($@))))),
# m4_define([asdf], [ASDF])
# m4_define([fsa], [FSA])
# m4_define([fdsa], [FDSA])
-# b4_warn([[[asdf), asdf]]], [[[fsa), fsa]]], [[[fdsa), fdsa]]])
-# b4_warn([[asdf), asdf]], [[fsa), fsa]], [[fdsa), fdsa]])
-# b4_warn()
-# b4_warn(1)
-# b4_warn(1, 2)
+# b4_warn_at([[[asdf), asdf]]], [[[fsa), fsa]]], [[[fdsa), fdsa]]])
+# b4_warn_at([[asdf), asdf]], [[fsa), fsa]], [[fdsa), fdsa]])
+# b4_warn_at()
+# b4_warn_at(1)
+# b4_warn_at(1, 2)
#
# Should produce this without newlines:
#
-# @warn([asdf), asdf]@,[fsa), fsa]@,[fdsa), fdsa]@)
-# @warn(asdf), asdf@,fsa), fsa@,fdsa), fdsa@)
+# @warn_at([asdf), asdf]@,@,@,[fsa), fsa]@,[fdsa), fdsa]@)
+# @warn(asdf), asdf@,@,@,fsa), fsa@,fdsa), fdsa@)
# @warn(@)
# @warn(1@)
# @warn(1@,2@)
m4_define([b4_warn],
-[b4_error([[warn]], $@)])
+[b4_error([[warn]], [], [], $@)])
# b4_warn_at(START, END, FORMAT, [ARG1], [ARG2], ...)
# ---------------------------------------------------
#
# b4_warn_at([[input.y:2.3]], [[input.y:5.4]], [[invalid %s]], [[foo]])
m4_define([b4_warn_at],
-[b4_error_at([[warn]], $@)])
+[b4_error([[warn]], $@)])
# b4_complain(FORMAT, [ARG1], [ARG2], ...)
# ----------------------------------------
-# Write @complain(FORMAT@,ARG1@,ARG2@,...@) to stdout.
+# Bounce to b4_complain_at.
#
# See b4_warn example.
m4_define([b4_complain],
-[b4_error([[complain]], $@)])
+[b4_error([[complain]], [], [], $@)])
# b4_complain_at(START, END, FORMAT, [ARG1], [ARG2], ...)
# -------------------------------------------------------
#
# See b4_warn_at example.
m4_define([b4_complain_at],
-[b4_error_at([[complain]], $@)])
+[b4_error([[complain]], $@)])
# b4_fatal(FORMAT, [ARG1], [ARG2], ...)
# -------------------------------------
-# Write @fatal(FORMAT@,ARG1@,ARG2@,...@) to stdout and exit.
+# Bounce to b4_fatal_at.
#
# See b4_warn example.
m4_define([b4_fatal],
-[b4_error([[fatal]], $@)dnl
+[b4_error([[fatal]], [], [], $@)dnl
m4_exit(1)])
# b4_fatal_at(START, END, FORMAT, [ARG1], [ARG2], ...)
#
# See b4_warn_at example.
m4_define([b4_fatal_at],
-[b4_error_at([[fatal]], $@)dnl
+[b4_error([[fatal]], $@)dnl
m4_exit(1)])
-## ---------------- ##
-## Default values. ##
-## ---------------- ##
-
-# m4_define_default([b4_lex_param], []) dnl breaks other skeletons
-m4_define_default([b4_pre_prologue], [])
-m4_define_default([b4_post_prologue], [])
-m4_define_default([b4_epilogue], [])
-m4_define_default([b4_parse_param], [])
-
-# The initial column and line.
-m4_define_default([b4_location_initial_column], [1])
-m4_define_default([b4_location_initial_line], [1])
-
-
## ------------ ##
## Data Types. ##
## ------------ ##
[m4_eval([$1 - $2])],
[($1) - ($2)])])
-# b4_args(ARG1, ...)
-# _b4_args(ARG1, ...)
+# b4_join(ARG1, ...)
+# _b4_join(ARG1, ...)
# -------------------
# Join with comma, skipping empty arguments.
-# b4_args calls itself recursively until it sees the first non-empty
-# argument, then calls _b4_args which prepends each non-empty argument
+# b4_join calls itself recursively until it sees the first non-empty
+# argument, then calls _b4_join which prepends each non-empty argument
# with a comma.
-m4_define([b4_args],
+m4_define([b4_join],
[m4_if([$#$1],
[1], [],
[m4_ifval([$1],
[$1[]_$0(m4_shift($@))],
[$0(m4_shift($@))])])])
-# _b4_args(ARGS1, ...)
+# _b4_join(ARGS1, ...)
# --------------------
-m4_define([_b4_args],
+m4_define([_b4_join],
[m4_if([$#$1],
[1], [],
[m4_ifval([$1], [, $1])[]$0(m4_shift($@))])])
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.]])
])
[m4_case(b4_$1_flag,
[0], [$3],
[1], [$2],
- [m4_fatal([invalid $1 value: ]$1)])])
+ [m4_fatal([invalid $1 value: ]b4_$1_flag)])])
# b4_define_flag_if(FLAG)
# _b4_define_flag_if($1, $2, FLAG)
# --------------------------------
-# This macro works around the impossibility to define macros
-# inside macros, because issuing `[$1]' is not possible in M4 :(.
-# This sucks hard, GNU M4 should really provide M5 like $$1.
+# Work around the impossibility to define macros inside macros,
+# because issuing `[$1]' is not possible in M4. GNU M4 should provide
+# $$1 a la M5/TeX.
m4_define([_b4_define_flag_if],
[m4_if([$1$2], $[1]$[2], [],
[m4_fatal([$0: Invalid arguments: $@])])dnl
b4_define_flag_if([defines]) # Whether headers are requested.
b4_define_flag_if([glr]) # Whether a GLR parser is requested.
b4_define_flag_if([nondeterministic]) # Whether conflicts should be handled.
+b4_define_flag_if([token_table]) # Whether yytoken_table is demanded.
b4_define_flag_if([yacc]) # Whether POSIX Yacc is emulated.
## Symbols. ##
## --------- ##
+# In order to unify the handling of the various aspects of symbols
+# (tag, type_name, whether terminal, etc.), bison.exe defines one
+# macro per (token, field), where field can has_id, id, etc.: see
+# src/output.c:prepare_symbols_definitions().
+#
+# The various FIELDS are:
+#
+# - has_id: 0 or 1.
+# Whether the symbol has an id.
+# - id: string
+# If has_id, the id. Guaranteed to be usable as a C identifier.
+# - tag: string.
+# A representat of the symbol. Can be 'foo', 'foo.id', '"foo"' etc.
+# - user_number: integer
+# The assigned (external) number as used by yylex.
+# - is_token: 0 or 1
+# Whether this is a terminal symbol.
+# - number: integer
+# The internalized number (used after yytranslate).
+# - has_type: 0, 1
+# Whether has a semantic value.
+# - type
+# If it has a semantic value, its type tag, or, if variant are used,
+# its type.
+# - has_printer: 0, 1
+# - printer: string
+# - printer_file: string
+# - printer_line: integer
+# If the symbol has a printer, everything about it.
+# - has_destructor, destructor, destructor_file, destructor_line
+# Likewise.
+#
+# The following macros provide access to these values.
+
# b4_symbol_(NUM, FIELD)
# ----------------------
# Recover a FIELD about symbol #NUM. Thanks to m4_indir, fails if
# b4_symbol(NUM, FIELD)
# ---------------------
# Recover a FIELD about symbol #NUM. Thanks to m4_indir, fails if
-# undefined. If FIELD = id, prepend the prefix.
+# undefined. If FIELD = id, prepend the token prefix.
m4_define([b4_symbol],
[m4_case([$2],
- [id], [m4_do([b4_percent_define_get([api.tokens.prefix])],
+ [id], [m4_do([b4_percent_define_get([api.token.prefix])],
[b4_symbol_([$1], [id])])],
[b4_symbol_($@)])])
[m4_fatal([$0: field $2 of $1 is not a Boolean:] b4_symbol([$1], [$2]))])])
+# b4_symbol_tag_comment(SYMBOL-NUM)
+# ---------------------------------
+# Issue a comment giving the tag of symbol NUM.
+m4_define([b4_symbol_tag_comment],
+[b4_comment([b4_symbol([$1], [tag])])
+])
+
+
# b4_symbol_action_location(SYMBOL-NUM, KIND)
# -------------------------------------------
# Report the location of the KIND action as FILE:LINE.
# Same as in C, but using references instead of pointers.
m4_define([b4_symbol_action],
[b4_symbol_if([$1], [has_$2],
-[m4_pushdef([b4_dollar_dollar],
- [b4_symbol_value([(*yyvaluep)],
- b4_symbol_if([$1], [has_type],
- [b4_symbol([$1], [type])]))])dnl
-m4_pushdef([b4_at_dollar], [(*yylocationp)])dnl
- b4_symbol_case_([$1])
+[b4_dollar_pushdef([(*yyvaluep)],
+ b4_symbol_if([$1], [has_type],
+ [m4_dquote(b4_symbol([$1], [type]))]),
+ [(*yylocationp)])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_popdef([b4_at_dollar])dnl
-m4_popdef([b4_dollar_dollar])dnl
+b4_dollar_popdef[]dnl
])])
# ---------------------------
# 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])])
])
m4_define([b4_symbol_foreach],
[m4_map([$1], m4_defn([b4_symbol_numbers]))])
+# b4_symbol_map(MACRO)
+# --------------------
+# Return a list (possibly empty elements) of MACRO invoked for each
+# SYMBOL-NUM.
+m4_define([b4_symbol_map],
+[m4_map_args_sep([$1(], [)], [,], b4_symbol_numbers)])
+
+
+# b4_token_visible_if(NUM, IF-TRUE, IF-FALSE)
+# -------------------------------------------
+# Whether NUM denotes a token that has an exported definition (i.e.,
+# shows in enum yytokentype).
+m4_define([b4_token_visible_if],
+[b4_symbol_if([$1], [is_token],
+ [b4_symbol_if([$1], [has_id], [$2], [$3])],
+ [$3])])
+
+# b4_token_has_definition(NUM)
+# ----------------------------
+# 1 if NUM is visible, nothing otherwise.
+m4_define([b4_token_has_definition],
+[b4_token_visible_if([$1], [1])])
+
+# b4_any_token_visible_if([IF-TRUE], [IF-FALSE])
+# ----------------------------------------------
+# Whether there is a token that needs to be defined.
+m4_define([b4_any_token_visible_if],
+[m4_ifval(b4_symbol_foreach([b4_token_has_definition]),
+ [$1], [$2])])
+
+
+# b4_token_format(FORMAT, NUM)
+# ----------------------------
+m4_define([b4_token_format],
+[b4_token_visible_if([$2],
+[m4_quote(m4_format([$1],
+ [b4_symbol([$2], [id])],
+ [b4_symbol([$2], [user_number])]))])])
+
## ------- ##
## Types. ##
# ---------------------
# Run actions for the symbol NUMS that all have the same type-name.
# Skip NUMS that have no type-name.
+#
+# To specify the action to run, define b4_dollar_dollar(NUMBER,
+# 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)
# -----------------------
m4_define([b4_percent_define_syncline(]$1[)], [[]])])])
-# b4_percent_define_if_define(VARIABLE)
-# -------------------------------------
-# Define b4_VARIABLE_if that executes its $1 or $2 depending whether
+# 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 `_'.
m4_define([b4_percent_define_if_define_],
[m4_define(m4_bpatsubst([b4_$1_if], [[-.]], [_]),
- [b4_percent_define_flag_if([$1], [$2], [$3])])])
+ [b4_percent_define_flag_if(m4_default([$2], [$1]),
+ [$3], [$4])])])
m4_define([b4_percent_define_if_define],
-[b4_percent_define_default([[$1]], [[false]])
-b4_percent_define_if_define_([$1], $[1], $[2])])
+[b4_percent_define_default([m4_default([$2], [$1])], [[false]])
+b4_percent_define_if_define_([$1], [$2], $[1], $[2])])
# b4_percent_define_check_values(VALUES)
[$1],
m4_dquote(m4_indir([b4_percent_define(]$1[)])))
m4_foreach([b4_value], m4_dquote(m4_shift($@)),
- [b4_complain_at(b4_percent_define_get_loc([$1]),
+ [b4_error([[note]], b4_percent_define_get_loc([$1]), []
[[accepted value: '%s']],
m4_dquote(b4_value))])])dnl
m4_popdef([b4_good_value])],
# Default values for %define.
# ---------------------------
-# If the api.tokens.prefix, it is empty.
-m4_percent_define_default([[api.tokens.prefix]], [[]])
+# If the api.token.prefix, it is empty.
+m4_percent_define_default([[api.token.prefix]], [[]])
# b4_parse_assert_if([IF-ASSERTIONS-ARE-USED], [IF-NOT])
# b4_parse_trace_if([IF-DEBUG-TRACES-ARE-ENABLED], [IF-NOT])
-# b4_lex_symbol_if([IF-YYLEX-RETURNS-A-COMPLETE-SYMBOL], [IF-NOT])
-# b4_variant_if([IF-VARIANT-ARE-USED], [IF-NOT])
+# b4_token_ctor_if([IF-YYLEX-RETURNS-A-TOKEN], [IF-NOT])
# ----------------------------------------------
-b4_percent_define_if_define([lex_symbol])
+b4_percent_define_if_define([token_ctor], [api.token.constructor])
b4_percent_define_if_define([locations]) # Whether locations are tracked.
b4_percent_define_if_define([parse.assert])
b4_percent_define_if_define([parse.trace])
-b4_percent_define_if_define([variant])
+
+
+# b4_bison_locations_if([IF-TRUE])
+# --------------------------------
+# Expand IF-TRUE if using locations, and using the default location
+# type.
+m4_define([b4_bison_locations_if],
+[b4_locations_if([b4_percent_define_ifdef([[api.location.type]], [], [$1])])])
# b4_error_verbose_if([IF-ERRORS-ARE-VERBOSE], [IF-NOT])
[verbose], [[1]])])
b4_define_flag_if([error_verbose])
+# yytoken_table is needed to support verbose errors.
+b4_error_verbose_if([m4_define([b4_token_table_flag], [1])])
+
+
+# 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]])])
+b4_define_flag_if([variant])
+
## ----------------------------------------------------------- ##
## After processing the skeletons, check that all the user's ##
b4_check_user_names_wrap([[define]], [[variable]])
b4_check_user_names_wrap([[code]], [[qualifier]])
])
+
+
+## ---------------- ##
+## Default values. ##
+## ---------------- ##
+
+# m4_define_default([b4_lex_param], []) dnl breaks other skeletons
+m4_define_default([b4_pre_prologue], [])
+m4_define_default([b4_post_prologue], [])
+m4_define_default([b4_epilogue], [])
+m4_define_default([b4_parse_param], [])
+
+# The initial column and line.
+m4_define_default([b4_location_initial_column], [1])
+m4_define_default([b4_location_initial_line], [1])
+
+# Sanity checks.
+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])])])
projects / bison.git / blobdiff