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[bison.git] / src / parse-gram.y

diff --git a/src/parse-gram.y b/src/parse-gram.y
index db15562dff750fbbc92a736b5f8892a5b5c9f727..027a773d221d2b914831281cfe9c9cbd8c32b7be 100644 (file)
--- a/src/parse-gram.y
+++ b/src/parse-gram.y
@@ -32,6 +32,7 @@
 #include "quotearg.h"
 #include "reader.h"
 #include "symlist.h"
+#include "strverscmp.h"
 
 #define YYLLOC_DEFAULT(Current, Rhs, N)  (Current) = lloc_default (Rhs, N)
 static YYLTYPE lloc_default (YYLTYPE const *, int);
@@ -39,6 +40,8 @@ static YYLTYPE lloc_default (YYLTYPE const *, int);
 #define YY_LOCATION_PRINT(File, Loc) \
           location_print (File, Loc)
 
+static void version_check (location const *loc, char const *version);
+
 /* Request detailed syntax error messages, and pass them to GRAM_ERROR.
    FIXME: depends on the undocumented availability of YYLLOC.  */
 #undef  yyerror
@@ -133,6 +136,7 @@ static int current_prec = 0;
   PERCENT_OUTPUT          "%output"
   PERCENT_PARSE_PARAM     "%parse-param {...}"
   PERCENT_PURE_PARSER     "%pure-parser"
+  PERCENT_REQUIRE        "%require"
   PERCENT_SKELETON        "%skeleton"
   PERCENT_START           "%start"
   PERCENT_TOKEN_TABLE     "%token-table"
@@ -177,7 +181,7 @@ static int current_prec = 0;
 %type <integer> INT
 %printer { fprintf (stderr, "%d", $$); } INT
 %type <symbol> ID symbol string_as_id
-%printer { fprintf (stderr, "%s", $$->tag); } ID symbol string_as_id
+%printer { fputs ($$->tag, stderr); } ID symbol string_as_id
 %type <symbol> ID_COLON
 %printer { fprintf (stderr, "%s:", $$->tag); } ID_COLON
 %type <assoc> precedence_declarator
@@ -202,6 +206,7 @@ declaration:
   grammar_declaration
 | PROLOGUE                                 { prologue_augment ($1, @1); }
 | "%debug"                                 { debug_flag = true; }
+| "%define" string_content                 { muscle_insert ($2, "1"); }
 | "%define" string_content string_content  { muscle_insert ($2, $3); }
 | "%defines"                               { defines_flag = true; }
 | "%error-verbose"                         { error_verbose = true; }
@@ -225,6 +230,7 @@ declaration:
 | "%output" "=" string_content             { spec_outfile = $3; }
 | "%parse-param {...}"                    { add_param ("parse_param", $1, @1); }
 | "%pure-parser"                           { pure_parser = true; }
+| "%require" string_content                { version_check (&@2, $2); }
 | "%skeleton" string_content               { skeleton = $2; }
 | "%token-table"                           { token_table_flag = true; }
 | "%verbose"                               { report_flag = report_states; }
@@ -529,6 +535,14 @@ add_param (char const *type, char *decl, location loc)
   scanner_last_string_free ();
 }
 
+static void
+version_check (location const *loc, char const *version)
+{
+  if (strverscmp (version, PACKAGE_VERSION) > 0)
+    complain_at (*loc, "require bison %s, but have %s",
+                version, PACKAGE_VERSION);
+}
+
 static void
 gram_error (location const *loc, char const *msg)
 {