Workin on Sass/CSS-specific lexical patterns. Also tweaking the primitive stuff as necessary.

src/text/lexical_patterns.c

 #include <stdio.h>
 #include "lexical_patterns.h"
 
+ALTERNATIVES_MATCHER(semicolon_or_lbrack, prefix_is_semicolon, prefix_is_lbrack);
+
+CHARS_MATCHER(import,  "@import");
+CHARS_MATCHER(include, "@include");
+CHARS_MATCHER(mixin,   "@mixin");
+CHARS_MATCHER(extend,  "@extend");
+
 static SEQUENCE_MATCHER(sign_and_identifier, prefix_is_sign, prefix_is_identifier);
 static ALTERNATIVES_MATCHER(word_initial, prefix_is_identifier, prefix_is_sign_and_identifier);
 static ALTERNATIVES_MATCHER(word_trailer, prefix_is_identifier, prefix_is_sign, prefix_is_digits);
+
 FIRST_REST_MATCHER(word, prefix_is_word_initial, prefix_is_word_trailer);
+
+SEQUENCE_MATCHER(class, prefix_is_dot, prefix_is_word);
+SEQUENCE_MATCHER(id, prefix_is_hash, prefix_is_word);
+SEQUENCE_MATCHER(pseudo_class, prefix_is_colon, prefix_is_word);
\ No newline at end of file

src/text/lexical_patterns.h

 #include "prefix_primitives.h"
 
+DECLARE(semicolon_or_lbrack);
+
 DECLARE(word);
+
+DECLARE(class);
+DECLARE(id);
+DECLARE(pseudo_class);

src/text/prefix_primitives.c

@@ -79,6 +79,11 @@ char *prefix_one_plus(char *src, prefix_matcher m) {
   return src;
 }
 
+char *prefix_find_first(char *src, prefix_matcher m) {
+  while (*src && !m(src)) src++;
+  return *src ? src : NULL;
+}
+
 SINGLE_CTYPE_MATCHER(space);
 SINGLE_CTYPE_MATCHER(alpha);
 SINGLE_CTYPE_MATCHER(digit);
@@ -112,6 +117,7 @@ CHAR_MATCHER (hyphen,      '-');
 CHAR_MATCHER (semicolon,   ';');
 CHAR_MATCHER (colon,       ':');
 CHAR_MATCHER (period,      '.');
+CHAR_MATCHER (dot,         '.');
 CHAR_MATCHER (question,    '?');
 CHAR_MATCHER (exclamation, '!');
 CHAR_MATCHER (tilde,       '~');
@@ -124,6 +130,7 @@ CHAR_MATCHER (pipe,        '|');
 CHAR_MATCHER (slash,       '/');
 CHAR_MATCHER (backslash,   '\\');
 CHAR_MATCHER (asterisk,    '*');
+CHAR_MATCHER (star,        '*');
 CHAR_MATCHER (pound,       '#');
 CHAR_MATCHER (hash,        '#');
 
@@ -143,8 +150,8 @@ CHAR_MATCHER (eq,          '=');
 CHAR_MATCHER (assign,      '=');
 CHARS_MATCHER(equal,       "==");
 
-CLASS_CHAR_MATCHER(sign,   "+-");
-CLASS_CHAR_MATCHER(delimiter, "()[]{}");
+CHAR_CLASS_MATCHER(sign,   "+-");
+CHAR_CLASS_MATCHER(delimiter, "()[]{}");
 
 static ALTERNATIVES_MATCHER(identifier_initial, prefix_is_alphas, prefix_is_underscore);
 static ALTERNATIVES_MATCHER(identifier_trailer, prefix_is_alnums, prefix_is_underscore);

src/text/prefix_primitives.h

@@ -13,12 +13,12 @@ char *prefix_is_ ## name(char *src) { \
   return prefix_is_chars(src, prefix); \
 }
 
-#define CLASS_CHAR_MATCHER(name, class) \
+#define CHAR_CLASS_MATCHER(name, class) \
 char *prefix_is_ ## name(char *src) { \
   return prefix_is_one_of(src, class); \
 }
 
-#define CLASS_CHARS_MATCHER(name, class) \
+#define CHARS_CLASS_MATCHER(name, class) \
 char *prefix_is_ ## name(char *src) { \
   return prefix_is_some_of(src, class); \
 }
@@ -83,6 +83,7 @@ char *_prefix_sequence(char *src, ...);
 char *prefix_optional(char *src, prefix_matcher m);
 char *prefix_zero_plus(char *src, prefix_matcher m);
 char *prefix_one_plus(char *src, prefix_matcher m);
+char *prefix_find_first(char *src, prefix_matcher m);
 
 DECLARE(space);
 DECLARE(alpha);
@@ -117,6 +118,7 @@ DECLARE(hyphen);
 DECLARE(semicolon);
 DECLARE(colon);
 DECLARE(period);
+DECLARE(dot);
 DECLARE(question);
 DECLARE(exclamation);
 DECLARE(tilde);
@@ -129,6 +131,7 @@ DECLARE(pipe);
 DECLARE(slash);
 DECLARE(backslash);
 DECLARE(asterisk);
+DECLARE(star);
 DECLARE(pound);
 DECLARE(hash);
                                   

src/text/test.c

@@ -33,7 +33,7 @@ int main() {
   char *words = "hello my name is aaron";
   char *id1 = "_identifier123{blah bloo}";
   char *non_id = "12non_ident_ifier_";
-  char *word2 = "-blah-bl+ah_bl12-34+1:foo";
+  char *word2 = "-blah-bl+ah_bl12-34+1:foobar;";
   char *non_word = "-12blah-bloo";
   char *selector = "#foo > :first-child { color: #abcdef; }";
   char *lcomment = "// blah blah blah // end\n blah blah";
@@ -41,6 +41,8 @@ int main() {
   char *integer1 = "3837483+3";
   char *integer2 = "+294739-4";
   char *integer3 = "-294729+1";
+  char *class = ".blah-blah_bloo112-blah+blee4 hello";
+  char *id = "#foo_bar-baz123-hux blee";
   
   test1(prefix_is_spaces, spaces);
   test1(prefix_is_spaces, words);
@@ -103,5 +105,13 @@ int main() {
   test1(prefix_is_word, word2);
   test1(prefix_is_word, integer3);
   
+  test1(prefix_is_class, class);
+  test1(prefix_is_class, words);
+  
+  test1(prefix_is_id, id);
+  test1(prefix_is_id, class);
+  
+  testn(prefix_find_first, word2, prefix_is_semicolon_or_lbrack);
+
   return 0;
 }