`hl_init()` must be called before any other library function.
`hl_deinit()` will ensure all occupied memory is freed.
+
```C
-void render_string(const char * const string, const char * const mode);
+void render_string(const char * const string, const char * const mode); //XXX: rename
```
This function matches _string_ against all known highlighting rules and dispatches the appropriate callback depending on _mode_.
+
```C
#define HLPATH //?!
```
Coma separated list of directories to be searched for syntax scripts. `#undef` to disable it entirely.
+
```C
typedef void (*attribute_callback_t)(const char * const string, const int length, void * const attributes);
```
-The type used for defining appropriate callbacks for render_string().
+The type used for defining appropriate callbacks for render\_string().
+ string - string to be outputed
+ length - number of characters that matched a highlighting rule
+ attributes - arbitrary data associated with the matched rule; intended to hold color/font information for example
+
+```C
+struct token_table_t;
+```
+Holds a group of tokens belonging to the same language.
+
+
```C
typedef struct {
char * key;
```
The type for defining display modes.
- void new_display_mode(display_t * mode);
-This is how you append a display mode that render_string() will search based on _.key_.
+
+```C
+void new_display_mode(display_t * mode);
+```
+This is how you append a display mode that render\_string() will search based on _.key_.
+
```C
typedef enum {
+ MATCH - a regular expression to be recognized
+ REGION - a regular expression where the starting and ending patters are to be distinguished from the contents
+
The universal way to add a new pattern to be recognized is with:
```C
token * new_token(const char * const syntax, const token_type_t t, const hl_group_t * const g);
```
+
+
There are also convinience functions:
```C
// NOTE: the return value is the number tokens successfully inserted
int new_keyword_tokens(const char * const * words, hl_group_t * const g); // _words_ must be NULL terminated
int new_syntax_character_tokens(const char * const chars, hl_group_t * const g);
```
-The regex engine used for MATCHes is Jeger by default, emulating Vim regex.
+
+
+The regex engine used for MATCH-es is Jeger by default, emulating Vim regex.
However the regex engine can be overridden:
```C
// ?!
```
+
+### Default
+There are default of most anything defined for convenience. They can be disable with `#undef`-ing the following macro:
+```C
+#define HL_DEFAULTS
+```
+
+```C
+hl_group_t * normal_hl
+hl_group_t * error_hl
+hl_group_t * warning_hl
+hl_group_t * search_hl
+
+hl_group_t * underlined_hl
+hl_group_t * bold_hl
+hl_group_t * italics_hl
+
+hl_group_t * comment_hl
+hl_group_t * block_hl
+hl_group_t * operator_hl
+hl_group_t * constant_hl
+hl_group_t * special_hl
+hl_group_t * identifier_hl
+hl_group_t * type_hl
+
+// ---
+token_table_t std_token_table;
+```
+
---
+
# hl
General purpose highlighter (and demo program for libhl).