1 files changed, 152 insertions, 0 deletions
diff --git a/src/regexp_defs.h b/src/regexp_defs.h
new file mode 100644
index 0000000000..0426f242a4
--- /dev/null
+++ b/src/regexp_defs.h
@@ -0,0 +1,152 @@
+/* vi:set ts=8 sts=4 sw=4:
+ *
+ * NOTICE NOTICE NOTICE NOTICE NOTICE NOTICE NOTICE NOTICE NOTICE NOTICE
+ *
+ * This is NOT the original regular expression code as written by Henry
+ * Spencer.  This code has been modified specifically for use with Vim, and
+ * should not be used apart from compiling Vim.  If you want a good regular
+ * expression library, get the original code.
+ *
+ * NOTICE NOTICE NOTICE NOTICE NOTICE NOTICE NOTICE NOTICE NOTICE NOTICE
+ */
+
+#ifndef _REGEXP_H
+#define _REGEXP_H
+
+/*
+ * The number of sub-matches is limited to 10.
+ * The first one (index 0) is the whole match, referenced with "\0".
+ * The second one (index 1) is the first sub-match, referenced with "\1".
+ * This goes up to the tenth (index 9), referenced with "\9".
+ */
+#define NSUBEXP  10
+
+/*
+ * In the NFA engine: how many braces are allowed.
+ * TODO(RE): Use dynamic memory allocation instead of static, like here
+ */
+#define NFA_MAX_BRACES 20
+
+typedef struct regengine regengine_T;
+
+/*
+ * Structure returned by vim_regcomp() to pass on to vim_regexec().
+ * This is the general structure. For the actual matcher, two specific
+ * structures are used. See code below.
+ */
+typedef struct regprog {
+  regengine_T         *engine;
+  unsigned regflags;
+} regprog_T;
+
+/*
+ * Structure used by the back track matcher.
+ * These fields are only to be used in regexp.c!
+ * See regexp.c for an explanation.
+ */
+typedef struct {
+  /* These two members implement regprog_T */
+  regengine_T         *engine;
+  unsigned regflags;
+
+  int regstart;
+  char_u reganch;
+  char_u              *regmust;
+  int regmlen;
+  char_u reghasz;
+  char_u program[1];                    /* actually longer.. */
+} bt_regprog_T;
+
+/*
+ * Structure representing a NFA state.
+ * A NFA state may have no outgoing edge, when it is a NFA_MATCH state.
+ */
+typedef struct nfa_state nfa_state_T;
+struct nfa_state {
+  int c;
+  nfa_state_T         *out;
+  nfa_state_T         *out1;
+  int id;
+  int lastlist[2];                   /* 0: normal, 1: recursive */
+  int val;
+};
+
+/*
+ * Structure used by the NFA matcher.
+ */
+typedef struct {
+  /* These two members implement regprog_T */
+  regengine_T         *engine;
+  unsigned regflags;
+
+  nfa_state_T         *start;           /* points into state[] */
+
+  int reganch;                          /* pattern starts with ^ */
+  int regstart;                         /* char at start of pattern */
+  char_u              *match_text;      /* plain text to match with */
+
+  int has_zend;                         /* pattern contains \ze */
+  int has_backref;                      /* pattern contains \1 .. \9 */
+  int reghasz;
+#ifdef DEBUG
+  char_u              *pattern;
+#endif
+  int nsubexp;                          /* number of () */
+  int nstate;
+  nfa_state_T state[1];                 /* actually longer.. */
+} nfa_regprog_T;
+
+/*
+ * Structure to be used for single-line matching.
+ * Sub-match "no" starts at "startp[no]" and ends just before "endp[no]".
+ * When there is no match, the pointer is NULL.
+ */
+typedef struct {
+  regprog_T           *regprog;
+  char_u              *startp[NSUBEXP];
+  char_u              *endp[NSUBEXP];
+  int rm_ic;
+} regmatch_T;
+
+/*
+ * Structure to be used for multi-line matching.
+ * Sub-match "no" starts in line "startpos[no].lnum" column "startpos[no].col"
+ * and ends in line "endpos[no].lnum" just before column "endpos[no].col".
+ * The line numbers are relative to the first line, thus startpos[0].lnum is
+ * always 0.
+ * When there is no match, the line number is -1.
+ */
+typedef struct {
+  regprog_T           *regprog;
+  lpos_T startpos[NSUBEXP];
+  lpos_T endpos[NSUBEXP];
+  int rmm_ic;
+  colnr_T rmm_maxcol;                   /* when not zero: maximum column */
+} regmmatch_T;
+
+/*
+ * Structure used to store external references: "\z\(\)" to "\z\1".
+ * Use a reference count to avoid the need to copy this around.  When it goes
+ * from 1 to zero the matches need to be freed.
+ */
+typedef struct {
+  short refcnt;
+  char_u              *matches[NSUBEXP];
+} reg_extmatch_T;
+
+struct regengine {
+  regprog_T   *(*regcomp)(char_u*, int);
+  void (*regfree)(regprog_T *);
+  int (*regexec)(regmatch_T*, char_u*, colnr_T);
+#if defined(FEAT_MODIFY_FNAME) || defined(FEAT_EVAL) \
+  || defined(FIND_REPLACE_DIALOG) || defined(PROTO)
+  int (*regexec_nl)(regmatch_T*, char_u*, colnr_T);
+#endif
+  long (*regexec_multi)(regmmatch_T*, win_T*, buf_T*, linenr_T, colnr_T,
+      proftime_T*);
+#ifdef DEBUG
+  char_u      *expr;
+#endif
+};
+
+#endif  /* _REGEXP_H */