Initial implementation of #line

Does not handle comments in #line or line continuation characters, but
it should be good enough for now.

diff --git a/glsl_lexer.lpp b/glsl_lexer.lpp
index a25dbf9..06214a8 100644 (file)
--- a/glsl_lexer.lpp
+++ b/glsl_lexer.lpp
@@ -21,6 +21,7 @@
  * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
  * DEALINGS IN THE SOFTWARE.
  */
+#include <ctype.h>
 #include "ast.h"
 #include "glsl_parser_extras.h"
 #include "glsl_parser.h"
@@ -43,6 +44,13 @@
 
 %x PP COMMENT
 
+DEC_INT                [1-9][0-9]*
+HEX_INT                0[xX][0-9a-fA-F]+
+OCT_INT                0[0-7]*
+INT            ({DEC_INT}|{HEX_INT}|{OCT_INT})
+SPC            [ \t]*
+SPCP           [ \t]+
+HASH           ^{SPC}#{SPC}
 %%
 
 "/*"                   { yy_push_state(COMMENT, yyscanner); }
@@ -59,7 +67,35 @@
 ^[ \t]*#[ \t]*$                        ;
 ^[ \t]*#[ \t]*version          { BEGIN PP; return VERSION; }
 ^[ \t]*#[ \t]*extension                { BEGIN PP; return EXTENSION; }
-^[ \t]*#[ \t]*line             { BEGIN PP; return LINE; }
+{HASH}line{SPCP}{INT}{SPCP}{INT}{SPC}$ {
+                                  /* Eat characters until the first digit is
+                                   * encountered
+                                   */
+                                  char *ptr = yytext;
+                                  while (!isdigit(*ptr))
+                                     ptr++;
+
+                                  /* Subtract one from the line number because
+                                   * yylineno is zero-based instead of
+                                   * one-based.
+                                   */
+                                  yylineno = strtol(ptr, &ptr, 0) - 1;
+                                  yylloc->source = strtol(ptr, NULL, 0);
+                               }
+{HASH}line{SPCP}{INT}{SPC}$    {
+                                  /* Eat characters until the first digit is
+                                   * encountered
+                                   */
+                                  char *ptr = yytext;
+                                  while (!isdigit(*ptr))
+                                     ptr++;
+
+                                  /* Subtract one from the line number because
+                                   * yylineno is zero-based instead of
+                                   * one-based.
+                                   */
+                                  yylineno = strtol(ptr, &ptr, 0) - 1;
+                               }
 ^[ \t]*#[ \t]*pragma           { BEGIN PP; return PRAGMA; }
 <PP>\/\/[^\n]*                 { }
 <PP>[ \t\r]*                   { }