diff options
Diffstat (limited to 'regcomp.h')
| -rw-r--r-- | regcomp.h | 25 |
1 files changed, 17 insertions, 8 deletions
@@ -191,7 +191,9 @@ struct regnode_charclass_class { U32 classflags; /* and run-time */ }; -/* Synthetic start class, is a regnode_charclass_class plus an SV* */ +/* Synthetic start class; is a regnode_charclass_class plus an SV*. Note that + * the 'next_off' field is unused, as the SSC stands alone, so there is never a + * next node. */ struct regnode_ssc { U8 flags; /* ANYOF_POSIXL bit must go here */ U8 type; @@ -314,14 +316,16 @@ struct regnode_ssc { /* Flags for node->flags of ANYOF. These are in short supply, but there is one * currently available. If more than this are needed, the ANYOF_LOCALE and - * ANYOF_POSIXL bits could be shared, making a space penalty for all locale nodes. - * Also, the ABOVE_LATIN1_ALL bit could be freed up by resorting to creating a - * swash containing everything above 255. This introduces a performance - * penalty. Better would be to split it off into a separate node, which - * actually would improve performance a bit by allowing regexec.c to test for a - * UTF-8 character being above 255 without having to call a function nor + * ANYOF_POSIXL bits could be shared, making a space penalty for all locale + * nodes. Also, the ABOVE_LATIN1_ALL bit could be freed up by resorting to + * creating a swash containing everything above 255. This introduces a + * performance penalty. Better would be to split it off into a separate node, + * which actually would improve performance a bit by allowing regexec.c to test + * for a UTF-8 character being above 255 without having to call a function nor * calculate its code point value. However, this solution might need to have a - * second node type, ANYOF_SYNTHETIC_ABOVE_LATIN1_ALL */ + * second node type, ANYOF_SYNTHETIC_ABOVE_LATIN1_ALL. Several flags are not + * used in synthetic start class (SSC) nodes, so could be shared should new + * flags be needed for SSCs. */ #define ANYOF_LOCALE 0x01 /* /l modifier */ @@ -333,6 +337,11 @@ struct regnode_ssc { #define ANYOF_INVERT 0x04 +/* For the SSC node only, which cannot be inverted, so is shared with that bit. + * This means "Does this SSC match an empty string?" This is used only during + * regex compilation. */ +#define ANYOF_EMPTY_STRING ANYOF_INVERT + /* Set if this is a regnode_charclass_posixl vs a regnode_charclass. This * is used for runtime \d, \w, [:posix:], ..., which are used only in locale * and the optimizer's synthetic start class. Non-locale \d, etc are resolved |