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/* liPattern are a parsed representation of a string that can contain various placeholders like $n, %n, %{var} or {enc:var} */
typedef struct {
enum {
PATTERN_STRING, /* literal */
PATTERN_NTH, /* $n */
PATTERN_VAR, /* %{} */
} type;
union {
GString *str; /* PATTERN_STRING */
guint8 ndx; /* PATTERN_NTH and PATTERN_NTH_PREV */
} data;
} liPatternPart;
/* liPattern is a GArray in disguise */
typedef GArray liPattern;
/* a pattern callback receives an integer index and a data pointer (usually an array) and must return a GString* which gets inserted into the pattern result */
typedef void (*liPatternCB) (GString *pattern_result, guint8 nth_ndx, gpointer data);
/* constructs a new liPattern* by parsing the given string, returns NULL on error */
LI_API liPattern *li_pattern_new(const gchar* str);
LI_API void li_pattern_free(liPattern *pattern);
LI_API void li_pattern_eval(liVRequest *vr, GString *dest, liPattern *pattern, liPatternCB nth_callback, gpointer nth_data, liPatternCB nth_prev_callback, gpointer nth_prev_data);
/* default array callback, expects a GArray* containing GString* elements */
LI_API void li_pattern_array_cb(GString *pattern_result, guint8 nth_ndx, gpointer data);
/* default regex callback, expects a GMatchInfo* */
LI_API void li_pattern_regex_cb(GString *pattern_result, guint8 nth_ndx, gpointer data);