diff options
Diffstat (limited to 'base/strings/string_util.cc')
-rw-r--r-- | base/strings/string_util.cc | 155 |
1 files changed, 0 insertions, 155 deletions
diff --git a/base/strings/string_util.cc b/base/strings/string_util.cc index 8d1d238..e2b7311 100644 --- a/base/strings/string_util.cc +++ b/base/strings/string_util.cc @@ -957,161 +957,6 @@ string16 ReplaceStringPlaceholders(const string16& format_string, return result; } -static bool IsWildcard(base_icu::UChar32 character) { - return character == '*' || character == '?'; -} - -// Move the strings pointers to the point where they start to differ. -template <typename CHAR, typename NEXT> -static void EatSameChars(const CHAR** pattern, const CHAR* pattern_end, - const CHAR** string, const CHAR* string_end, - NEXT next) { - const CHAR* escape = NULL; - while (*pattern != pattern_end && *string != string_end) { - if (!escape && IsWildcard(**pattern)) { - // We don't want to match wildcard here, except if it's escaped. - return; - } - - // Check if the escapement char is found. If so, skip it and move to the - // next character. - if (!escape && **pattern == '\\') { - escape = *pattern; - next(pattern, pattern_end); - continue; - } - - // Check if the chars match, if so, increment the ptrs. - const CHAR* pattern_next = *pattern; - const CHAR* string_next = *string; - base_icu::UChar32 pattern_char = next(&pattern_next, pattern_end); - if (pattern_char == next(&string_next, string_end) && - pattern_char != CBU_SENTINEL) { - *pattern = pattern_next; - *string = string_next; - } else { - // Uh oh, it did not match, we are done. If the last char was an - // escapement, that means that it was an error to advance the ptr here, - // let's put it back where it was. This also mean that the MatchPattern - // function will return false because if we can't match an escape char - // here, then no one will. - if (escape) { - *pattern = escape; - } - return; - } - - escape = NULL; - } -} - -template <typename CHAR, typename NEXT> -static void EatWildcard(const CHAR** pattern, const CHAR* end, NEXT next) { - while (*pattern != end) { - if (!IsWildcard(**pattern)) - return; - next(pattern, end); - } -} - -template <typename CHAR, typename NEXT> -static bool MatchPatternT(const CHAR* eval, const CHAR* eval_end, - const CHAR* pattern, const CHAR* pattern_end, - int depth, - NEXT next) { - const int kMaxDepth = 16; - if (depth > kMaxDepth) - return false; - - // Eat all the matching chars. - EatSameChars(&pattern, pattern_end, &eval, eval_end, next); - - // If the string is empty, then the pattern must be empty too, or contains - // only wildcards. - if (eval == eval_end) { - EatWildcard(&pattern, pattern_end, next); - return pattern == pattern_end; - } - - // Pattern is empty but not string, this is not a match. - if (pattern == pattern_end) - return false; - - // If this is a question mark, then we need to compare the rest with - // the current string or the string with one character eaten. - const CHAR* next_pattern = pattern; - next(&next_pattern, pattern_end); - if (pattern[0] == '?') { - if (MatchPatternT(eval, eval_end, next_pattern, pattern_end, - depth + 1, next)) - return true; - const CHAR* next_eval = eval; - next(&next_eval, eval_end); - if (MatchPatternT(next_eval, eval_end, next_pattern, pattern_end, - depth + 1, next)) - return true; - } - - // This is a *, try to match all the possible substrings with the remainder - // of the pattern. - if (pattern[0] == '*') { - // Collapse duplicate wild cards (********** into *) so that the - // method does not recurse unnecessarily. http://crbug.com/52839 - EatWildcard(&next_pattern, pattern_end, next); - - while (eval != eval_end) { - if (MatchPatternT(eval, eval_end, next_pattern, pattern_end, - depth + 1, next)) - return true; - eval++; - } - - // We reached the end of the string, let see if the pattern contains only - // wildcards. - if (eval == eval_end) { - EatWildcard(&pattern, pattern_end, next); - if (pattern != pattern_end) - return false; - return true; - } - } - - return false; -} - -struct NextCharUTF8 { - base_icu::UChar32 operator()(const char** p, const char* end) { - base_icu::UChar32 c; - int offset = 0; - CBU8_NEXT(*p, offset, end - *p, c); - *p += offset; - return c; - } -}; - -struct NextCharUTF16 { - base_icu::UChar32 operator()(const char16** p, const char16* end) { - base_icu::UChar32 c; - int offset = 0; - CBU16_NEXT(*p, offset, end - *p, c); - *p += offset; - return c; - } -}; - -bool MatchPattern(const base::StringPiece& eval, - const base::StringPiece& pattern) { - return MatchPatternT(eval.data(), eval.data() + eval.size(), - pattern.data(), pattern.data() + pattern.size(), - 0, NextCharUTF8()); -} - -bool MatchPattern(const string16& eval, const string16& pattern) { - return MatchPatternT(eval.c_str(), eval.c_str() + eval.size(), - pattern.c_str(), pattern.c_str() + pattern.size(), - 0, NextCharUTF16()); -} - // The following code is compatible with the OpenBSD lcpy interface. See: // http://www.gratisoft.us/todd/papers/strlcpy.html // ftp://ftp.openbsd.org/pub/OpenBSD/src/lib/libc/string/{wcs,str}lcpy.c |