Named symbol references.

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

diff --git a/src/parse-gram.y b/src/parse-gram.y
index caa3d3098de65f60f493ae23fe0da154b7a68cef..0fbb8cbd2eaf281bb4f7f7e5964f91e1af42292d 100644 (file)
--- a/src/parse-gram.y
+++ b/src/parse-gram.y
@@ -30,6 +30,7 @@
 #include "quotearg.h"
 #include "reader.h"
 #include "symlist.h"
+#include "named-ref.h"
 #include "scan-gram.h"
 #include "scan-code.h"
 
@@ -63,6 +64,7 @@ static symbol_class current_class = unknown_sym;
 static uniqstr current_type = NULL;
 static symbol *current_lhs;
 static location current_lhs_location;
+static named_ref *current_lhs_named_ref;
 static int current_prec = 0;
 
 #define YYTYPE_INT16 int_fast16_t
@@ -98,6 +100,7 @@ static int current_prec = 0;
   assoc assoc;
   uniqstr uniqstr;
   unsigned char character;
+  named_ref *named_ref;
 };
 
 /* Define the tokens together with their human representation.  */
@@ -167,6 +170,7 @@ static int current_prec = 0;
 %token TAG             "<tag>"
 %token TAG_ANY         "<*>"
 %token TAG_NONE        "<>"
+%token BRACKETED_ID    "[id]"
 
 %type <character> CHAR
 %printer { fputs (char_name ($$), stderr); } CHAR
@@ -180,7 +184,8 @@ static int current_prec = 0;
 %printer { fprintf (stderr, "{\n%s\n}", $$); }
         braceless content.opt "{...}" "%{...%}" EPILOGUE
 
-%type <uniqstr> TAG ID ID_COLON PERCENT_FLAG variable
+%type <uniqstr> TAG ID ID_COLON BRACKETED_ID PERCENT_FLAG variable
+%type <named_ref> named_ref.opt
 %printer { fputs ($$, stderr); } ID variable
 %printer { fprintf (stderr, "%s:", $$); } ID_COLON
 %printer { fprintf (stderr, "%%%s", $$); } PERCENT_FLAG
@@ -229,7 +234,8 @@ prologue_declaration:
     }
 | "%define" variable content.opt
     {
-      muscle_percent_define_insert ($2, @2, $3);
+      muscle_percent_define_insert ($2, @2, $3,
+                                    MUSCLE_PERCENT_DEFINE_GRAMMAR_FILE);
     }
 | "%defines"                       { defines_flag = true; }
 | "%defines" STRING
@@ -504,7 +510,8 @@ rules_or_grammar_declaration:
 ;
 
 rules:
-  id_colon { current_lhs = $1; current_lhs_location = @1; } rhses.1
+  id_colon named_ref.opt { current_lhs = $1; current_lhs_location = @1;
+    current_lhs_named_ref = $2; } rhses.1
 ;
 
 rhses.1:
@@ -515,11 +522,12 @@ rhses.1:
 
 rhs:
   /* Nothing.  */
-    { grammar_current_rule_begin (current_lhs, current_lhs_location); }
-| rhs symbol
-    { grammar_current_rule_symbol_append ($2, @2); }
-| rhs "{...}"
-    { grammar_current_rule_action_append ($2, @2); }
+    { grammar_current_rule_begin (current_lhs, current_lhs_location,
+                                 current_lhs_named_ref); }
+| rhs symbol named_ref.opt
+    { grammar_current_rule_symbol_append ($2, @2, $3); }
+| rhs "{...}" named_ref.opt
+    { grammar_current_rule_action_append ($2, @2, $3); }
 | rhs "%prec" symbol
     { grammar_current_rule_prec_set ($3, @3); }
 | rhs "%dprec" INT
@@ -528,11 +536,21 @@ rhs:
     { grammar_current_rule_merge_set ($3, @3); }
 ;
 
+named_ref.opt:
+  /* Nothing.  */
+    { $$ = 0; }
+|
+  BRACKETED_ID
+    { $$ = named_ref_new($1, @1); }
+;
+
 
 /*---------------------------.
 | variable and content.opt.  |
 `---------------------------*/
 
+/* The STRING form of variable is deprecated and is not M4-friendly.
+   For example, M4 fails for `%define "[" "value"'.  */
 variable:
   ID
 | STRING { $$ = uniqstr_new ($1); }