aboutsummaryrefslogtreecommitdiff
path: root/mesalib/src/glsl/glcpp/glcpp-lex.l
diff options
context:
space:
mode:
Diffstat (limited to 'mesalib/src/glsl/glcpp/glcpp-lex.l')
-rw-r--r--mesalib/src/glsl/glcpp/glcpp-lex.l49
1 files changed, 22 insertions, 27 deletions
diff --git a/mesalib/src/glsl/glcpp/glcpp-lex.l b/mesalib/src/glsl/glcpp/glcpp-lex.l
index 11b73aea8..68e44eb79 100644
--- a/mesalib/src/glsl/glcpp/glcpp-lex.l
+++ b/mesalib/src/glsl/glcpp/glcpp-lex.l
@@ -57,7 +57,7 @@ void glcpp_set_column (int column_no , yyscan_t yyscanner);
%option stack
%option never-interactive
-%x DONE COMMENT UNREACHABLE
+%x DONE COMMENT UNREACHABLE SKIP
SPACE [[:space:]]
NONSPACE [^[:space:]]
@@ -74,6 +74,17 @@ OCTAL_INTEGER 0[0-7]*[uU]?
HEXADECIMAL_INTEGER 0[xX][0-9a-fA-F]+[uU]?
%%
+ /* Implicitly switch between SKIP and INITIAL (non-skipping);
+ * don't switch if some other state was explicitly set.
+ */
+ glcpp_parser_t *parser = yyextra;
+ if (YY_START == 0 || YY_START == SKIP) {
+ if (parser->lexing_if || parser->skip_stack == NULL || parser->skip_stack->type == SKIP_NO_SKIP) {
+ BEGIN 0;
+ } else {
+ BEGIN SKIP;
+ }
+ }
/* Single-line comments */
"//"[^\n]* {
@@ -137,60 +148,44 @@ HEXADECIMAL_INTEGER 0[xX][0-9a-fA-F]+[uU]?
yylineno = strtol(ptr, &ptr, 0) - 1;
}
-{HASH}ifdef/.*\n {
+<SKIP,INITIAL>{
+{HASH}ifdef {
yyextra->lexing_if = 1;
yyextra->space_tokens = 0;
return HASH_IFDEF;
}
-{HASH}ifndef/.*\n {
+{HASH}ifndef {
yyextra->lexing_if = 1;
yyextra->space_tokens = 0;
return HASH_IFNDEF;
}
-{HASH}if/[^_a-zA-Z0-9].*\n {
+{HASH}if/[^_a-zA-Z0-9] {
yyextra->lexing_if = 1;
yyextra->space_tokens = 0;
return HASH_IF;
}
-{HASH}elif/.*\n {
+{HASH}elif {
yyextra->lexing_if = 1;
yyextra->space_tokens = 0;
return HASH_ELIF;
}
-{HASH}else/.*\n {
+{HASH}else {
yyextra->space_tokens = 0;
return HASH_ELSE;
}
-{HASH}endif/.*\n {
+{HASH}endif {
yyextra->space_tokens = 0;
return HASH_ENDIF;
}
-
- /* When skipping (due to an #if 0 or similar) consume anything
- * up to a newline. We do this with less priority than any
- * #if-related directive (#if, #elif, #else, #endif), but with
- * more priority than any other directive or token to avoid
- * any side-effects from skipped content.
- *
- * We use the lexing_if flag to avoid skipping any part of an
- * if conditional expression. */
-[^\n]+/\n {
- /* Since this rule always matches, YY_USER_ACTION gets called for it,
- * wrongly incrementing yycolumn. We undo that effect here. */
- yycolumn -= yyleng;
- if (yyextra->lexing_if ||
- yyextra->skip_stack == NULL ||
- yyextra->skip_stack->type == SKIP_NO_SKIP)
- {
- REJECT;
- }
}
+<SKIP>[^\n] ;
+
{HASH}error.* {
char *p;
for (p = yytext; !isalpha(p[0]); p++); /* skip " # " */
@@ -293,7 +288,7 @@ HEXADECIMAL_INTEGER 0[xX][0-9a-fA-F]+[uU]?
}
}
-\n {
+<SKIP,INITIAL>\n {
yyextra->lexing_if = 0;
yylineno++;
yycolumn = 0;