X-Git-Url: https://git.saurik.com/bison.git/blobdiff_plain/4a9cd8f24abba232b4a07ccdda4c6f109d27acac..ea9e670d728ac659e139434de31ea9306ecdd117:/data/bison.m4

diff --git a/data/bison.m4 b/data/bison.m4
index 37bc012f..6f06266d 100644
--- a/data/bison.m4
+++ b/data/bison.m4
@@ -61,6 +61,30 @@ This special exception was added by the Free Software Foundation in
 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.  ##
 ## ---------------- ##
@@ -82,30 +106,16 @@ _m4eof
 ])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($@))))),
@@ -125,21 +135,21 @@ m4_define([b4_error_at],
 #   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], ...)
 # ---------------------------------------------------
@@ -149,15 +159,15 @@ m4_define([b4_warn],
 #
 #   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], ...)
 # -------------------------------------------------------
@@ -165,15 +175,15 @@ m4_define([b4_complain],
 #
 # 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], ...)
@@ -182,25 +192,10 @@ m4_exit(1)])
 #
 # 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.  ##
 ## ------------ ##
@@ -221,23 +216,23 @@ m4_define([b4_subtract],
            [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])[]$0(m4_shift($@))])])
@@ -317,9 +312,9 @@ m4_define([b4_define_flag_if],
 
 # _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
@@ -333,6 +328,7 @@ m4_define([b4_$3_if],
 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.
 
 
@@ -340,6 +336,13 @@ 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 following macros provide access to these values.
+
 # b4_symbol_(NUM, FIELD)
 # ----------------------
 # Recover a FIELD about symbol #NUM.  Thanks to m4_indir, fails if
@@ -354,7 +357,7 @@ m4_define([b4_symbol_],
 # undefined.  If FIELD = id, prepend the 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_([$1], [id])])],
          [b4_symbol_($@)])])
 
@@ -383,19 +386,17 @@ m4_define([b4_symbol_action_location],
 # 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_syncline([@oline@], [@ofile@])
         break;
 
-m4_popdef([b4_at_dollar])dnl
-m4_popdef([b4_dollar_dollar])dnl
+b4_dollar_popdef[]dnl
 ])])
 
 
@@ -420,6 +421,45 @@ m4_define([b4_symbol_case_],
 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.  ##
@@ -681,17 +721,18 @@ m4_define([b4_percent_define_default],
             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)
@@ -727,7 +768,7 @@ m4_define([_b4_percent_define_check_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])],
@@ -774,20 +815,27 @@ m4_define([b4_percent_code_ifdef],
 
 # 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_token_ctor_if([IF-YYLEX-RETURNS-A-TOKEN], [IF-NOT])
 # b4_variant_if([IF-VARIANT-ARE-USED], [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])
 # ------------------------------------------------------
@@ -802,6 +850,9 @@ m4_define([b4_error_verbose_flag],
                    [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])])
+
 
 ## ----------------------------------------------------------- ##
 ## After processing the skeletons, check that all the user's   ##
@@ -818,3 +869,26 @@ m4_wrap_lifo([
 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])])])