Improve libunicode and libregexp headers (#288)

- move all `lre_xxx` functions to libunicode
- use flags table `lre_ctype_bits` instead of bitmaps
- simplify `lre_is_space`, `lre_js_is_ident_first` and `lre_js_is_ident_next`
- simplify `simple_next_token`, handle UTF-8 correctly
- simplify `is_let`, remove dead code

1 files changed, 3 insertions, 40 deletions

diff --git a/libregexp.h b/libregexp.h
index 757b277..7af7ece 100644
--- a/libregexp.h
+++ b/libregexp.h
@@ -25,10 +25,7 @@
 #define LIBREGEXP_H
 
 #include <stddef.h>
-
-#include "libunicode.h"
-
-#define LRE_BOOL  int       /* for documentation purposes */
+#include <stdint.h>
 
 #define LRE_FLAG_GLOBAL     (1 << 0)
 #define LRE_FLAG_IGNORECASE (1 << 1)
@@ -50,43 +47,9 @@ int lre_exec(uint8_t **capture,
              int cbuf_type, void *opaque);
 
 int lre_parse_escape(const uint8_t **pp, int allow_utf16);
-LRE_BOOL lre_is_space(int c);
 
-/* must be provided by the user */
-LRE_BOOL lre_check_stack_overflow(void *opaque, size_t alloca_size);
+/* must be provided by the user, return non zero if overflow */
+int lre_check_stack_overflow(void *opaque, size_t alloca_size);
 void *lre_realloc(void *opaque, void *ptr, size_t size);
 
-/* JS identifier test */
-extern uint32_t const lre_id_start_table_ascii[4];
-extern uint32_t const lre_id_continue_table_ascii[4];
-
-static inline int lre_js_is_ident_first(int c)
-{
-    if ((uint32_t)c < 128) {
-        return (lre_id_start_table_ascii[c >> 5] >> (c & 31)) & 1;
-    } else {
-#ifdef CONFIG_ALL_UNICODE
-        return lre_is_id_start(c);
-#else
-        return !lre_is_space(c);
-#endif
-    }
-}
-
-static inline int lre_js_is_ident_next(int c)
-{
-    if ((uint32_t)c < 128) {
-        return (lre_id_continue_table_ascii[c >> 5] >> (c & 31)) & 1;
-    } else {
-        /* ZWNJ and ZWJ are accepted in identifiers */
-#ifdef CONFIG_ALL_UNICODE
-        return lre_is_id_continue(c) || c == 0x200C || c == 0x200D;
-#else
-        return !lre_is_space(c) || c == 0x200C || c == 0x200D;
-#endif
-    }
-}
-
-#undef LRE_BOOL
-
 #endif /* LIBREGEXP_H */