contrib/tre/lib/tre-parse.h

   1 /*
   2   tre-parse.c - Regexp parser definitions
   3
   4   This software is released under a BSD-style license.
   5   See the file LICENSE for details and copyright.
   6
   7 */
   8
   9 #ifndef TRE_PARSE_H
  10 #define TRE_PARSE_H 1
  11
  12 #include "xlocale_private.h"
  13
  14 /* Parse context. */
  15 typedef struct {
  16   /* Memory allocator.  The AST is allocated using this. */
  17   tre_mem_t mem;
  18   /* Stack used for keeping track of regexp syntax. */
  19   tre_stack_t *stack;
  20   /* The parse result. */
  21   tre_ast_node_t *result;
  22   /* The regexp to parse and its length. */
  23   const tre_char_t *re;
  24   /* The first character of the entire regexp. */
  25   const tre_char_t *re_start;
  26   /* The first character after the end of the regexp. */
  27   const tre_char_t *re_end;
  28   /* The current locale */
  29   locale_t loc;
  30   int len;
  31   /* Current submatch ID. */
  32   int submatch_id;
  33   /* Current invisible submatch ID. */
  34   int submatch_id_invisible;
  35   /* Current position (number of literal). */
  36   int position;
  37   /* The highest back reference or -1 if none seen so far. */
  38   int max_backref;
  39   /* Number of tags that need reordering. */
  40   int num_reorder_tags;
  41   /* This flag is set if the regexp uses approximate matching. */
  42   int have_approx;
  43   /* Compilation flags. */
  44   int cflags;
  45   /* If this flag is set the top-level submatch is not captured. */
  46   int nofirstsub;
  47   /* The currently set approximate matching parameters. */
  48   int params[TRE_PARAM_LAST];
  49 } tre_parse_ctx_t;
  50
  51 /* Parses a wide character regexp pattern into a syntax tree.  This parser
  52    handles both syntaxes (BRE and ERE), including the TRE extensions. */
  53 reg_errcode_t
  54 tre_parse(tre_parse_ctx_t *ctx);
  55
  56 #endif /* TRE_PARSE_H */
  57
  58 /* EOF */