/
regexp.c
2959 lines (2696 loc) · 69.3 KB
/
regexp.c
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/* vi:set ts=8 sts=4 sw=4 noet:
*
* Handling of regular expressions: vim_regcomp(), vim_regexec(), vim_regsub()
*/
// By default: do not create debugging logs or files related to regular
// expressions, even when compiling with -DDEBUG.
// Uncomment the second line to get the regexp debugging.
#undef DEBUG
// #define DEBUG
#include "vim.h"
#ifdef DEBUG
// show/save debugging data when BT engine is used
# define BT_REGEXP_DUMP
// save the debugging data to a file instead of displaying it
# define BT_REGEXP_LOG
# define BT_REGEXP_DEBUG_LOG
# define BT_REGEXP_DEBUG_LOG_NAME "bt_regexp_debug.log"
#endif
/*
* Magic characters have a special meaning, they don't match literally.
* Magic characters are negative. This separates them from literal characters
* (possibly multi-byte). Only ASCII characters can be Magic.
*/
#define Magic(x) ((int)(x) - 256)
#define un_Magic(x) ((x) + 256)
#define is_Magic(x) ((x) < 0)
static int
no_Magic(int x)
{
if (is_Magic(x))
return un_Magic(x);
return x;
}
static int
toggle_Magic(int x)
{
if (is_Magic(x))
return un_Magic(x);
return Magic(x);
}
/*
* The first byte of the BT regexp internal "program" is actually this magic
* number; the start node begins in the second byte. It's used to catch the
* most severe mutilation of the program by the caller.
*/
#define REGMAGIC 0234
/*
* Utility definitions.
*/
#define UCHARAT(p) ((int)*(char_u *)(p))
// Used for an error (down from) vim_regcomp(): give the error message, set
// rc_did_emsg and return NULL
#define EMSG_RET_NULL(m) return (emsg((m)), rc_did_emsg = TRUE, (void *)NULL)
#define IEMSG_RET_NULL(m) return (iemsg((m)), rc_did_emsg = TRUE, (void *)NULL)
#define EMSG_RET_FAIL(m) return (emsg((m)), rc_did_emsg = TRUE, FAIL)
#define EMSG2_RET_NULL(m, c) return (semsg((const char *)(m), (c) ? "" : "\\"), rc_did_emsg = TRUE, (void *)NULL)
#define EMSG3_RET_NULL(m, c, a) return (semsg((const char *)(m), (c) ? "" : "\\", (a)), rc_did_emsg = TRUE, (void *)NULL)
#define EMSG2_RET_FAIL(m, c) return (semsg((const char *)(m), (c) ? "" : "\\"), rc_did_emsg = TRUE, FAIL)
#define EMSG_ONE_RET_NULL EMSG2_RET_NULL(_("E369: invalid item in %s%%[]"), reg_magic == MAGIC_ALL)
#define MAX_LIMIT (32767L << 16L)
static char_u e_missingbracket[] = N_("E769: Missing ] after %s[");
static char_u e_reverse_range[] = N_("E944: Reverse range in character class");
static char_u e_large_class[] = N_("E945: Range too large in character class");
static char_u e_recursive[] = N_("E956: Cannot use pattern recursively");
#define NOT_MULTI 0
#define MULTI_ONE 1
#define MULTI_MULT 2
// return values for regmatch()
#define RA_FAIL 1 // something failed, abort
#define RA_CONT 2 // continue in inner loop
#define RA_BREAK 3 // break inner loop
#define RA_MATCH 4 // successful match
#define RA_NOMATCH 5 // didn't match
/*
* Return NOT_MULTI if c is not a "multi" operator.
* Return MULTI_ONE if c is a single "multi" operator.
* Return MULTI_MULT if c is a multi "multi" operator.
*/
static int
re_multi_type(int c)
{
if (c == Magic('@') || c == Magic('=') || c == Magic('?'))
return MULTI_ONE;
if (c == Magic('*') || c == Magic('+') || c == Magic('{'))
return MULTI_MULT;
return NOT_MULTI;
}
static char_u *reg_prev_sub = NULL;
/*
* REGEXP_INRANGE contains all characters which are always special in a []
* range after '\'.
* REGEXP_ABBR contains all characters which act as abbreviations after '\'.
* These are:
* \n - New line (NL).
* \r - Carriage Return (CR).
* \t - Tab (TAB).
* \e - Escape (ESC).
* \b - Backspace (Ctrl_H).
* \d - Character code in decimal, eg \d123
* \o - Character code in octal, eg \o80
* \x - Character code in hex, eg \x4a
* \u - Multibyte character code, eg \u20ac
* \U - Long multibyte character code, eg \U12345678
*/
static char_u REGEXP_INRANGE[] = "]^-n\\";
static char_u REGEXP_ABBR[] = "nrtebdoxuU";
/*
* Translate '\x' to its control character, except "\n", which is Magic.
*/
static int
backslash_trans(int c)
{
switch (c)
{
case 'r': return CAR;
case 't': return TAB;
case 'e': return ESC;
case 'b': return BS;
}
return c;
}
/*
* Check for a character class name "[:name:]". "pp" points to the '['.
* Returns one of the CLASS_ items. CLASS_NONE means that no item was
* recognized. Otherwise "pp" is advanced to after the item.
*/
static int
get_char_class(char_u **pp)
{
static const char *(class_names[]) =
{
"alnum:]",
#define CLASS_ALNUM 0
"alpha:]",
#define CLASS_ALPHA 1
"blank:]",
#define CLASS_BLANK 2
"cntrl:]",
#define CLASS_CNTRL 3
"digit:]",
#define CLASS_DIGIT 4
"graph:]",
#define CLASS_GRAPH 5
"lower:]",
#define CLASS_LOWER 6
"print:]",
#define CLASS_PRINT 7
"punct:]",
#define CLASS_PUNCT 8
"space:]",
#define CLASS_SPACE 9
"upper:]",
#define CLASS_UPPER 10
"xdigit:]",
#define CLASS_XDIGIT 11
"tab:]",
#define CLASS_TAB 12
"return:]",
#define CLASS_RETURN 13
"backspace:]",
#define CLASS_BACKSPACE 14
"escape:]",
#define CLASS_ESCAPE 15
"ident:]",
#define CLASS_IDENT 16
"keyword:]",
#define CLASS_KEYWORD 17
"fname:]",
#define CLASS_FNAME 18
};
#define CLASS_NONE 99
int i;
if ((*pp)[1] == ':')
{
for (i = 0; i < (int)ARRAY_LENGTH(class_names); ++i)
if (STRNCMP(*pp + 2, class_names[i], STRLEN(class_names[i])) == 0)
{
*pp += STRLEN(class_names[i]) + 2;
return i;
}
}
return CLASS_NONE;
}
/*
* Specific version of character class functions.
* Using a table to keep this fast.
*/
static short class_tab[256];
#define RI_DIGIT 0x01
#define RI_HEX 0x02
#define RI_OCTAL 0x04
#define RI_WORD 0x08
#define RI_HEAD 0x10
#define RI_ALPHA 0x20
#define RI_LOWER 0x40
#define RI_UPPER 0x80
#define RI_WHITE 0x100
static void
init_class_tab(void)
{
int i;
static int done = FALSE;
if (done)
return;
for (i = 0; i < 256; ++i)
{
if (i >= '0' && i <= '7')
class_tab[i] = RI_DIGIT + RI_HEX + RI_OCTAL + RI_WORD;
else if (i >= '8' && i <= '9')
class_tab[i] = RI_DIGIT + RI_HEX + RI_WORD;
else if (i >= 'a' && i <= 'f')
class_tab[i] = RI_HEX + RI_WORD + RI_HEAD + RI_ALPHA + RI_LOWER;
#ifdef EBCDIC
else if ((i >= 'g' && i <= 'i') || (i >= 'j' && i <= 'r')
|| (i >= 's' && i <= 'z'))
#else
else if (i >= 'g' && i <= 'z')
#endif
class_tab[i] = RI_WORD + RI_HEAD + RI_ALPHA + RI_LOWER;
else if (i >= 'A' && i <= 'F')
class_tab[i] = RI_HEX + RI_WORD + RI_HEAD + RI_ALPHA + RI_UPPER;
#ifdef EBCDIC
else if ((i >= 'G' && i <= 'I') || ( i >= 'J' && i <= 'R')
|| (i >= 'S' && i <= 'Z'))
#else
else if (i >= 'G' && i <= 'Z')
#endif
class_tab[i] = RI_WORD + RI_HEAD + RI_ALPHA + RI_UPPER;
else if (i == '_')
class_tab[i] = RI_WORD + RI_HEAD;
else
class_tab[i] = 0;
}
class_tab[' '] |= RI_WHITE;
class_tab['\t'] |= RI_WHITE;
done = TRUE;
}
#define ri_digit(c) (c < 0x100 && (class_tab[c] & RI_DIGIT))
#define ri_hex(c) (c < 0x100 && (class_tab[c] & RI_HEX))
#define ri_octal(c) (c < 0x100 && (class_tab[c] & RI_OCTAL))
#define ri_word(c) (c < 0x100 && (class_tab[c] & RI_WORD))
#define ri_head(c) (c < 0x100 && (class_tab[c] & RI_HEAD))
#define ri_alpha(c) (c < 0x100 && (class_tab[c] & RI_ALPHA))
#define ri_lower(c) (c < 0x100 && (class_tab[c] & RI_LOWER))
#define ri_upper(c) (c < 0x100 && (class_tab[c] & RI_UPPER))
#define ri_white(c) (c < 0x100 && (class_tab[c] & RI_WHITE))
// flags for regflags
#define RF_ICASE 1 // ignore case
#define RF_NOICASE 2 // don't ignore case
#define RF_HASNL 4 // can match a NL
#define RF_ICOMBINE 8 // ignore combining characters
#define RF_LOOKBH 16 // uses "\@<=" or "\@<!"
/*
* Global work variables for vim_regcomp().
*/
static char_u *regparse; // Input-scan pointer.
static int regnpar; // () count.
static int wants_nfa; // regex should use NFA engine
#ifdef FEAT_SYN_HL
static int regnzpar; // \z() count.
static int re_has_z; // \z item detected
#endif
static unsigned regflags; // RF_ flags for prog
#if defined(FEAT_SYN_HL) || defined(PROTO)
static int had_eol; // TRUE when EOL found by vim_regcomp()
#endif
static magic_T reg_magic; // magicness of the pattern
static int reg_string; // matching with a string instead of a buffer
// line
static int reg_strict; // "[abc" is illegal
/*
* META contains all characters that may be magic, except '^' and '$'.
*/
#ifdef EBCDIC
static char_u META[] = "%&()*+.123456789<=>?@ACDFHIKLMOPSUVWX[_acdfhiklmnopsuvwxz{|~";
#else
// META[] is used often enough to justify turning it into a table.
static char_u META_flags[] = {
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
// % & ( ) * + .
0, 0, 0, 0, 0, 1, 1, 0, 1, 1, 1, 1, 0, 0, 1, 0,
// 1 2 3 4 5 6 7 8 9 < = > ?
0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 1, 1, 1, 1,
// @ A C D F H I K L M O
1, 1, 0, 1, 1, 0, 1, 0, 1, 1, 0, 1, 1, 1, 0, 1,
// P S U V W X Z [ _
1, 0, 0, 1, 0, 1, 1, 1, 1, 0, 1, 1, 0, 0, 0, 1,
// a c d f h i k l m n o
0, 1, 0, 1, 1, 0, 1, 0, 1, 1, 0, 1, 1, 1, 1, 1,
// p s u v w x z { | ~
1, 0, 0, 1, 0, 1, 1, 1, 1, 0, 1, 1, 1, 0, 1
};
#endif
static int curchr; // currently parsed character
// Previous character. Note: prevchr is sometimes -1 when we are not at the
// start, eg in /[ ^I]^ the pattern was never found even if it existed,
// because ^ was taken to be magic -- webb
static int prevchr;
static int prevprevchr; // previous-previous character
static int nextchr; // used for ungetchr()
// arguments for reg()
#define REG_NOPAREN 0 // toplevel reg()
#define REG_PAREN 1 // \(\)
#define REG_ZPAREN 2 // \z(\)
#define REG_NPAREN 3 // \%(\)
typedef struct
{
char_u *regparse;
int prevchr_len;
int curchr;
int prevchr;
int prevprevchr;
int nextchr;
int at_start;
int prev_at_start;
int regnpar;
} parse_state_T;
static void initchr(char_u *);
static int getchr(void);
static void skipchr_keepstart(void);
static int peekchr(void);
static void skipchr(void);
static void ungetchr(void);
static long gethexchrs(int maxinputlen);
static long getoctchrs(void);
static long getdecchrs(void);
static int coll_get_char(void);
static int prog_magic_wrong(void);
static int cstrncmp(char_u *s1, char_u *s2, int *n);
static char_u *cstrchr(char_u *, int);
static int re_mult_next(char *what);
static int reg_iswordc(int);
#ifdef FEAT_EVAL
static void report_re_switch(char_u *pat);
#endif
static regengine_T bt_regengine;
static regengine_T nfa_regengine;
/*
* Return TRUE if compiled regular expression "prog" can match a line break.
*/
int
re_multiline(regprog_T *prog)
{
return (prog->regflags & RF_HASNL);
}
/*
* Check for an equivalence class name "[=a=]". "pp" points to the '['.
* Returns a character representing the class. Zero means that no item was
* recognized. Otherwise "pp" is advanced to after the item.
*/
static int
get_equi_class(char_u **pp)
{
int c;
int l = 1;
char_u *p = *pp;
if (p[1] == '=' && p[2] != NUL)
{
if (has_mbyte)
l = (*mb_ptr2len)(p + 2);
if (p[l + 2] == '=' && p[l + 3] == ']')
{
if (has_mbyte)
c = mb_ptr2char(p + 2);
else
c = p[2];
*pp += l + 4;
return c;
}
}
return 0;
}
#ifdef EBCDIC
/*
* Table for equivalence class "c". (IBM-1047)
*/
static char *EQUIVAL_CLASS_C[16] = {
"A\x62\x63\x64\x65\x66\x67",
"C\x68",
"E\x71\x72\x73\x74",
"I\x75\x76\x77\x78",
"N\x69",
"O\xEB\xEC\xED\xEE\xEF\x80",
"U\xFB\xFC\xFD\xFE",
"Y\xBA",
"a\x42\x43\x44\x45\x46\x47",
"c\x48",
"e\x51\x52\x53\x54",
"i\x55\x56\x57\x58",
"n\x49",
"o\xCB\xCC\xCD\xCE\xCF\x70",
"u\xDB\xDC\xDD\xDE",
"y\x8D\xDF",
};
#endif
/*
* Check for a collating element "[.a.]". "pp" points to the '['.
* Returns a character. Zero means that no item was recognized. Otherwise
* "pp" is advanced to after the item.
* Currently only single characters are recognized!
*/
static int
get_coll_element(char_u **pp)
{
int c;
int l = 1;
char_u *p = *pp;
if (p[0] != NUL && p[1] == '.' && p[2] != NUL)
{
if (has_mbyte)
l = (*mb_ptr2len)(p + 2);
if (p[l + 2] == '.' && p[l + 3] == ']')
{
if (has_mbyte)
c = mb_ptr2char(p + 2);
else
c = p[2];
*pp += l + 4;
return c;
}
}
return 0;
}
static int reg_cpo_lit; // 'cpoptions' contains 'l' flag
static int reg_cpo_bsl; // 'cpoptions' contains '\' flag
static void
get_cpo_flags(void)
{
reg_cpo_lit = vim_strchr(p_cpo, CPO_LITERAL) != NULL;
reg_cpo_bsl = vim_strchr(p_cpo, CPO_BACKSL) != NULL;
}
/*
* Skip over a "[]" range.
* "p" must point to the character after the '['.
* The returned pointer is on the matching ']', or the terminating NUL.
*/
static char_u *
skip_anyof(char_u *p)
{
int l;
if (*p == '^') // Complement of range.
++p;
if (*p == ']' || *p == '-')
++p;
while (*p != NUL && *p != ']')
{
if (has_mbyte && (l = (*mb_ptr2len)(p)) > 1)
p += l;
else
if (*p == '-')
{
++p;
if (*p != ']' && *p != NUL)
MB_PTR_ADV(p);
}
else if (*p == '\\'
&& !reg_cpo_bsl
&& (vim_strchr(REGEXP_INRANGE, p[1]) != NULL
|| (!reg_cpo_lit && vim_strchr(REGEXP_ABBR, p[1]) != NULL)))
p += 2;
else if (*p == '[')
{
if (get_char_class(&p) == CLASS_NONE
&& get_equi_class(&p) == 0
&& get_coll_element(&p) == 0
&& *p != NUL)
++p; // it is not a class name and not NUL
}
else
++p;
}
return p;
}
/*
* Skip past regular expression.
* Stop at end of "startp" or where "delim" is found ('/', '?', etc).
* Take care of characters with a backslash in front of it.
* Skip strings inside [ and ].
*/
char_u *
skip_regexp(
char_u *startp,
int delim,
int magic)
{
return skip_regexp_ex(startp, delim, magic, NULL, NULL, NULL);
}
/*
* Call skip_regexp() and when the delimiter does not match give an error and
* return NULL.
*/
char_u *
skip_regexp_err(
char_u *startp,
int delim,
int magic)
{
char_u *p = skip_regexp(startp, delim, magic);
if (*p != delim)
{
semsg(_("E654: missing delimiter after search pattern: %s"), startp);
return NULL;
}
return p;
}
/*
* skip_regexp() with extra arguments:
* When "newp" is not NULL and "dirc" is '?', make an allocated copy of the
* expression and change "\?" to "?". If "*newp" is not NULL the expression
* is changed in-place.
* If a "\?" is changed to "?" then "dropped" is incremented, unless NULL.
* If "magic_val" is not NULL, returns the effective magicness of the pattern
*/
char_u *
skip_regexp_ex(
char_u *startp,
int dirc,
int magic,
char_u **newp,
int *dropped,
magic_T *magic_val)
{
magic_T mymagic;
char_u *p = startp;
if (magic)
mymagic = MAGIC_ON;
else
mymagic = MAGIC_OFF;
get_cpo_flags();
for (; p[0] != NUL; MB_PTR_ADV(p))
{
if (p[0] == dirc) // found end of regexp
break;
if ((p[0] == '[' && mymagic >= MAGIC_ON)
|| (p[0] == '\\' && p[1] == '[' && mymagic <= MAGIC_OFF))
{
p = skip_anyof(p + 1);
if (p[0] == NUL)
break;
}
else if (p[0] == '\\' && p[1] != NUL)
{
if (dirc == '?' && newp != NULL && p[1] == '?')
{
// change "\?" to "?", make a copy first.
if (*newp == NULL)
{
*newp = vim_strsave(startp);
if (*newp != NULL)
p = *newp + (p - startp);
}
if (dropped != NULL)
++*dropped;
if (*newp != NULL)
STRMOVE(p, p + 1);
else
++p;
}
else
++p; // skip next character
if (*p == 'v')
mymagic = MAGIC_ALL;
else if (*p == 'V')
mymagic = MAGIC_NONE;
}
}
if (magic_val != NULL)
*magic_val = mymagic;
return p;
}
/*
* Functions for getting characters from the regexp input.
*/
static int prevchr_len; // byte length of previous char
static int at_start; // True when on the first character
static int prev_at_start; // True when on the second character
/*
* Start parsing at "str".
*/
static void
initchr(char_u *str)
{
regparse = str;
prevchr_len = 0;
curchr = prevprevchr = prevchr = nextchr = -1;
at_start = TRUE;
prev_at_start = FALSE;
}
/*
* Save the current parse state, so that it can be restored and parsing
* starts in the same state again.
*/
static void
save_parse_state(parse_state_T *ps)
{
ps->regparse = regparse;
ps->prevchr_len = prevchr_len;
ps->curchr = curchr;
ps->prevchr = prevchr;
ps->prevprevchr = prevprevchr;
ps->nextchr = nextchr;
ps->at_start = at_start;
ps->prev_at_start = prev_at_start;
ps->regnpar = regnpar;
}
/*
* Restore a previously saved parse state.
*/
static void
restore_parse_state(parse_state_T *ps)
{
regparse = ps->regparse;
prevchr_len = ps->prevchr_len;
curchr = ps->curchr;
prevchr = ps->prevchr;
prevprevchr = ps->prevprevchr;
nextchr = ps->nextchr;
at_start = ps->at_start;
prev_at_start = ps->prev_at_start;
regnpar = ps->regnpar;
}
/*
* Get the next character without advancing.
*/
static int
peekchr(void)
{
static int after_slash = FALSE;
if (curchr == -1)
{
switch (curchr = regparse[0])
{
case '.':
case '[':
case '~':
// magic when 'magic' is on
if (reg_magic >= MAGIC_ON)
curchr = Magic(curchr);
break;
case '(':
case ')':
case '{':
case '%':
case '+':
case '=':
case '?':
case '@':
case '!':
case '&':
case '|':
case '<':
case '>':
case '#': // future ext.
case '"': // future ext.
case '\'': // future ext.
case ',': // future ext.
case '-': // future ext.
case ':': // future ext.
case ';': // future ext.
case '`': // future ext.
case '/': // Can't be used in / command
// magic only after "\v"
if (reg_magic == MAGIC_ALL)
curchr = Magic(curchr);
break;
case '*':
// * is not magic as the very first character, eg "?*ptr", when
// after '^', eg "/^*ptr" and when after "\(", "\|", "\&". But
// "\(\*" is not magic, thus must be magic if "after_slash"
if (reg_magic >= MAGIC_ON
&& !at_start
&& !(prev_at_start && prevchr == Magic('^'))
&& (after_slash
|| (prevchr != Magic('(')
&& prevchr != Magic('&')
&& prevchr != Magic('|'))))
curchr = Magic('*');
break;
case '^':
// '^' is only magic as the very first character and if it's after
// "\(", "\|", "\&' or "\n"
if (reg_magic >= MAGIC_OFF
&& (at_start
|| reg_magic == MAGIC_ALL
|| prevchr == Magic('(')
|| prevchr == Magic('|')
|| prevchr == Magic('&')
|| prevchr == Magic('n')
|| (no_Magic(prevchr) == '('
&& prevprevchr == Magic('%'))))
{
curchr = Magic('^');
at_start = TRUE;
prev_at_start = FALSE;
}
break;
case '$':
// '$' is only magic as the very last char and if it's in front of
// either "\|", "\)", "\&", or "\n"
if (reg_magic >= MAGIC_OFF)
{
char_u *p = regparse + 1;
int is_magic_all = (reg_magic == MAGIC_ALL);
// ignore \c \C \m \M \v \V and \Z after '$'
while (p[0] == '\\' && (p[1] == 'c' || p[1] == 'C'
|| p[1] == 'm' || p[1] == 'M'
|| p[1] == 'v' || p[1] == 'V' || p[1] == 'Z'))
{
if (p[1] == 'v')
is_magic_all = TRUE;
else if (p[1] == 'm' || p[1] == 'M' || p[1] == 'V')
is_magic_all = FALSE;
p += 2;
}
if (p[0] == NUL
|| (p[0] == '\\'
&& (p[1] == '|' || p[1] == '&' || p[1] == ')'
|| p[1] == 'n'))
|| (is_magic_all
&& (p[0] == '|' || p[0] == '&' || p[0] == ')'))
|| reg_magic == MAGIC_ALL)
curchr = Magic('$');
}
break;
case '\\':
{
int c = regparse[1];
if (c == NUL)
curchr = '\\'; // trailing '\'
else if (
#ifdef EBCDIC
vim_strchr(META, c)
#else
c <= '~' && META_flags[c]
#endif
)
{
/*
* META contains everything that may be magic sometimes,
* except ^ and $ ("\^" and "\$" are only magic after
* "\V"). We now fetch the next character and toggle its
* magicness. Therefore, \ is so meta-magic that it is
* not in META.
*/
curchr = -1;
prev_at_start = at_start;
at_start = FALSE; // be able to say "/\*ptr"
++regparse;
++after_slash;
peekchr();
--regparse;
--after_slash;
curchr = toggle_Magic(curchr);
}
else if (vim_strchr(REGEXP_ABBR, c))
{
/*
* Handle abbreviations, like "\t" for TAB -- webb
*/
curchr = backslash_trans(c);
}
else if (reg_magic == MAGIC_NONE && (c == '$' || c == '^'))
curchr = toggle_Magic(c);
else
{
/*
* Next character can never be (made) magic?
* Then backslashing it won't do anything.
*/
if (has_mbyte)
curchr = (*mb_ptr2char)(regparse + 1);
else
curchr = c;
}
break;
}
default:
if (has_mbyte)
curchr = (*mb_ptr2char)(regparse);
}
}
return curchr;
}
/*
* Eat one lexed character. Do this in a way that we can undo it.
*/
static void
skipchr(void)
{
// peekchr() eats a backslash, do the same here
if (*regparse == '\\')
prevchr_len = 1;
else
prevchr_len = 0;
if (regparse[prevchr_len] != NUL)
{
if (enc_utf8)
// exclude composing chars that mb_ptr2len does include
prevchr_len += utf_ptr2len(regparse + prevchr_len);
else if (has_mbyte)
prevchr_len += (*mb_ptr2len)(regparse + prevchr_len);
else
++prevchr_len;
}
regparse += prevchr_len;
prev_at_start = at_start;
at_start = FALSE;
prevprevchr = prevchr;
prevchr = curchr;
curchr = nextchr; // use previously unget char, or -1
nextchr = -1;
}
/*
* Skip a character while keeping the value of prev_at_start for at_start.
* prevchr and prevprevchr are also kept.
*/
static void
skipchr_keepstart(void)
{
int as = prev_at_start;
int pr = prevchr;
int prpr = prevprevchr;
skipchr();
at_start = as;
prevchr = pr;
prevprevchr = prpr;
}
/*
* Get the next character from the pattern. We know about magic and such, so
* therefore we need a lexical analyzer.
*/
static int
getchr(void)
{
int chr = peekchr();
skipchr();
return chr;
}
/*
* put character back. Works only once!
*/
static void
ungetchr(void)
{
nextchr = curchr;
curchr = prevchr;
prevchr = prevprevchr;
at_start = prev_at_start;
prev_at_start = FALSE;
// Backup regparse, so that it's at the same position as before the
// getchr().
regparse -= prevchr_len;
}
/*
* Get and return the value of the hex string at the current position.
* Return -1 if there is no valid hex number.
* The position is updated:
* blahblah\%x20asdf
* before-^ ^-after
* The parameter controls the maximum number of input characters. This will be
* 2 when reading a \%x20 sequence and 4 when reading a \%u20AC sequence.
*/
static long
gethexchrs(int maxinputlen)
{
long_u nr = 0;
int c;
int i;
for (i = 0; i < maxinputlen; ++i)
{
c = regparse[0];
if (!vim_isxdigit(c))
break;
nr <<= 4;
nr |= hex2nr(c);
++regparse;
}
if (i == 0)
return -1;
return (long)nr;
}
/*
* Get and return the value of the decimal string immediately after the
* current position. Return -1 for invalid. Consumes all digits.
*/
static long
getdecchrs(void)
{
long_u nr = 0;
int c;
int i;
for (i = 0; ; ++i)
{
c = regparse[0];
if (c < '0' || c > '9')
break;
nr *= 10;
nr += c - '0';
++regparse;
curchr = -1; // no longer valid
}
if (i == 0)
return -1;
return (long)nr;
}
/*
* get and return the value of the octal string immediately after the current
* position. Return -1 for invalid, or 0-255 for valid. Smart enough to handle
* numbers > 377 correctly (for example, 400 is treated as 40) and doesn't
* treat 8 or 9 as recognised characters. Position is updated:
* blahblah\%o210asdf
* before-^ ^-after
*/
static long
getoctchrs(void)
{
long_u nr = 0;
int c;