+%{
+
+#include "system.h"
+#include "obstack.h"
+#include "files.h"
+
+#include "muscle_tab.h"
+
+#define YYDEBUG 1
+#define YYERROR_VERBOSE 1
+
+extern FILE* yyin;
+extern int yylineno;
+
+char* prefix = NULL;
+FILE* parser = NULL;
+
+size_t output_line;
+size_t skeleton_line;
+
+extern struct obstack muscle_obstack;
+
+%}
+
+%union
+{
+ char* muscle;
+ char* string;
+ char character;
+ int yacc;
+}
+
+%token< muscle > MUSCLE
+%token< string > STRING
+%token< character > CHARACTER
+
+%token LINE
+%token SLINE
+
+%token YACC
+%token SECTION
+
+%token GUARDS
+%token TOKENS
+%token ACTIONS
+
+%type< yacc > section.yacc
+
+%start skeleton
+
+%%
+
+skeleton : /* Empty. */ { }
+ | section skeleton { }
+;
+
+section : section.header section.body { }
+;
+
+section.header : SECTION gb MUSCLE gb STRING gb section.yacc gb '\n'
+{
+ char* name = 0;
+ char* limit = 0;
+ char* suffix = $5;
+
+ /* Close the previous parser. */
+ if (parser)
+ parser = (xfclose (parser), NULL);
+
+ /* If the following section should be named with the yacc-style, and it's
+ suffix is of the form 'something.h' or 'something.c', then add '.tab' in
+ the middle of the suffix. */
+ if (tab_extension && $7 && (strsuffix (suffix, ".h") ||
+ strsuffix (suffix, ".c")))
+ {
+ size_t prefix_len = strlen (prefix);
+ size_t suffix_len = strlen (suffix);
+
+ /* Allocate enough space to insert '.tab'. */
+ name = XMALLOC (char, prefix_len + suffix_len + 5);
+ limit = strrchr (suffix, '.');
+ if (!limit)
+ limit = suffix;
+
+ /* Prefix is 'X', suffix is 'Y.Z'. Name will be 'XY.tab.Z'. */
+ {
+ char* cp = 0;
+ cp = stpcpy (name, prefix);
+ cp = stpncpy (cp, suffix, limit - suffix);
+ cp = stpcpy (cp, ".tab");
+ cp = stpcpy (cp, limit);
+ }
+ }
+ else
+ name = stringappend (prefix, suffix);
+
+ /* Prepare the next parser to be output. */
+ parser = xfopen (name, "w");
+ MUSCLE_INSERT_STRING ("parser-file-name", name);
+ XFREE (name);
+
+ ++skeleton_line;
+}
+;
+
+section.yacc : /* Empty. */ { $$ = 0; }
+ | YACC { $$ = 1; }
+;
+
+section.body
+: /* Empty. */ { }
+| section.body '\n' { fputc ('\n', parser); ++output_line; ++skeleton_line; }
+| section.body LINE { fprintf (parser, "%d", output_line); }
+| section.body SLINE { fprintf (parser, "%d", skeleton_line); }
+| section.body GUARDS { guards_output (parser, &output_line); }
+| section.body TOKENS { token_definitions_output (parser, &output_line); }
+| section.body ACTIONS { actions_output (parser, &output_line); }
+| section.body CHARACTER { fputc ($2, parser); }
+| section.body MUSCLE {
+ const char* value = muscle_find ($2);
+ if (value)
+ {
+ fputs (value, parser);
+ output_line += get_lines_number (value);
+ }
+ else
+ {
+ fprintf (parser, "%%{%s}", $2);
+ merror ($2);
+ }
+}
+;
+
+gb : /* Empty. */ { }
+ | gb CHARACTER { /* Do not echo garbage characters. */ }
+;
+
+%%
+
+int
+merror (const char* error)
+{
+ printf ("line %d: %%{%s} undeclared.\n", skeleton_line, error);
+ return 0;
+}
+
+int
+yyerror (const char* error)
+{
+ printf ("line %d: %s.\n", yylineno, error);
+ return 0;
+}
+
+int
+process_skeleton (const char* grammar,
+ const char* skeleton)
+{
+ const char* limit = 0;
+
+ /* Compute prefix. Actually, it seems that the processing I need here is
+ done in compute_base_names, and the result stored in short_base_name. */
+ prefix = short_base_name;
+
+ /* Prepare a few things. */
+ output_line = 1;
+ skeleton_line = 1;
+
+ /* Output. */
+ yyin = fopen (skeleton, "r");
+ yydebug = 0;
+ yyparse ();
+
+ /* Close the last parser. */
+ if (parser)
+ parser = (xfclose (parser), NULL);
+}
projects / bison.git / commitdiff
