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/*
* types.h - Datatypes used by BPEG
*/
#ifndef TYPES__H
#define TYPES__H
#include <sys/types.h>
/*
* BPEG virtual machine opcodes
*/
enum VMOpcode {
VM_EMPTY = 0,
VM_ANYCHAR = 1,
VM_ANYTHING_BUT,
VM_STRING,
VM_RANGE,
VM_NOT,
VM_UPTO_AND,
VM_REPEAT,
VM_BEFORE,
VM_AFTER,
VM_CAPTURE,
VM_OTHERWISE,
VM_CHAIN,
VM_REPLACE,
VM_REF,
};
/*
* A struct reperesenting a BPEG virtual machine operation
*/
typedef struct vm_op_s {
enum VMOpcode op;
unsigned int multiline:1;
const char *start, *end;
// Length of the match, if constant, otherwise -1
ssize_t len;
union {
const char *s;
struct {
char low, high;
} range;
struct {
ssize_t min, max;
struct vm_op_s *sep, *repeat_pat;
} repetitions;
// TODO: use a linked list instead of a binary tree
struct {
struct vm_op_s *first, *second;
} multiple;
struct {
struct vm_op_s *replace_pat;
const char *replacement;
} replace;
struct {
struct vm_op_s *capture_pat;
char *name;
} capture;
struct vm_op_s *pat;
} args;
} vm_op_t;
/*
* Pattern matching result object
*/
typedef struct match_s {
// Where the match starts and ends (end is after the last character)
const char *start, *end;
unsigned int is_capture:1, is_replacement:1, is_ref:1;
const char *name_or_replacement;
struct match_s *child, *nextsibling;
vm_op_t *op;
} match_t;
typedef struct {
const char *name;
const char *source;
vm_op_t *op;
} def_t;
typedef struct {
vm_op_t *pattern;
def_t *definitions;
size_t size, capacity;
} grammar_t;
#endif
// vim: ts=4 sw=0 et cino=L2,l1,(0,W4,m1
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