diff options
Diffstat (limited to 'libjava/classpath/gnu/java/util/regex/RETokenWordBoundary.java')
| -rw-r--r-- | libjava/classpath/gnu/java/util/regex/RETokenWordBoundary.java | 169 |
1 files changed, 97 insertions, 72 deletions
diff --git a/libjava/classpath/gnu/java/util/regex/RETokenWordBoundary.java b/libjava/classpath/gnu/java/util/regex/RETokenWordBoundary.java index 538c6bef40c..9f758b63588 100644 --- a/libjava/classpath/gnu/java/util/regex/RETokenWordBoundary.java +++ b/libjava/classpath/gnu/java/util/regex/RETokenWordBoundary.java @@ -38,79 +38,104 @@ exception statement from your version. */ package gnu.java.util.regex; +import gnu.java.lang.CPStringBuilder; + /** * Represents a combination lookahead/lookbehind for POSIX [:alnum:]. */ -final class RETokenWordBoundary extends REToken { - private boolean negated; - private int where; - static final int BEGIN = 1; - static final int END = 2; - - RETokenWordBoundary(int subIndex, int where, boolean negated) { - super(subIndex); - this.where = where; - this.negated = negated; - } - - int getMaximumLength() { - return 0; - } - - - REMatch matchThis(CharIndexed input, REMatch mymatch) { - // Word boundary means input[index-1] was a word character - // and input[index] is not, or input[index] is a word character - // and input[index-1] was not - // In the string "one two three", these positions match: - // |o|n|e| |t|w|o| |t|h|r|e|e| - // ^ ^ ^ ^ ^ ^ - boolean after = false; // is current character a letter or digit? - boolean before = false; // is previous character a letter or digit? - char ch; - - // TODO: Also check REG_ANCHORINDEX vs. anchor - if (((mymatch.eflags & RE.REG_ANCHORINDEX) != RE.REG_ANCHORINDEX) - || (mymatch.offset + mymatch.index > mymatch.anchor)) { - if ((ch = input.charAt(mymatch.index - 1)) != CharIndexed.OUT_OF_BOUNDS) { - before = Character.isLetterOrDigit(ch) || (ch == '_'); - } - } - - if ((ch = input.charAt(mymatch.index)) != CharIndexed.OUT_OF_BOUNDS) { - after = Character.isLetterOrDigit(ch) || (ch == '_'); - } - - // if (before) and (!after), we're at end (\>) - // if (after) and (!before), we're at beginning (\<) - boolean doNext = false; - - if ((where & BEGIN) == BEGIN) { - doNext = after && !before; - } - if ((where & END) == END) { - doNext ^= before && !after; - } - - if (negated) doNext = !doNext; - - return (doNext ? mymatch : null); - } - - boolean returnsFixedLengthMatches() { return true; } - - int findFixedLengthMatches(CharIndexed input, REMatch mymatch, int max) { - if(matchThis(input, mymatch) != null) return max; - else return 0; - } - - void dump(StringBuffer os) { - if (where == (BEGIN | END)) { - os.append( negated ? "\\B" : "\\b" ); - } else if (where == BEGIN) { - os.append("\\<"); - } else { - os.append("\\>"); - } - } +final class RETokenWordBoundary extends REToken +{ + private boolean negated; + private int where; + static final int BEGIN = 1; + static final int END = 2; + + RETokenWordBoundary (int subIndex, int where, boolean negated) + { + super (subIndex); + this.where = where; + this.negated = negated; + } + + int getMaximumLength () + { + return 0; + } + + + REMatch matchThis (CharIndexed input, REMatch mymatch) + { + // Word boundary means input[index-1] was a word character + // and input[index] is not, or input[index] is a word character + // and input[index-1] was not + // In the string "one two three", these positions match: + // |o|n|e| |t|w|o| |t|h|r|e|e| + // ^ ^ ^ ^ ^ ^ + boolean after = false; // is current character a letter or digit? + boolean before = false; // is previous character a letter or digit? + char ch; + + // TODO: Also check REG_ANCHORINDEX vs. anchor + if (((mymatch.eflags & RE.REG_ANCHORINDEX) != RE.REG_ANCHORINDEX) + || (mymatch.offset + mymatch.index > mymatch.anchor)) + { + if ((ch = + input.charAt (mymatch.index - 1)) != CharIndexed.OUT_OF_BOUNDS) + { + before = Character.isLetterOrDigit (ch) || (ch == '_'); + } + } + + if ((ch = input.charAt (mymatch.index)) != CharIndexed.OUT_OF_BOUNDS) + { + after = Character.isLetterOrDigit (ch) || (ch == '_'); + } + + // if (before) and (!after), we're at end (\>) + // if (after) and (!before), we're at beginning (\<) + boolean doNext = false; + + if ((where & BEGIN) == BEGIN) + { + doNext = after && !before; + } + if ((where & END) == END) + { + doNext ^= before && !after; + } + + if (negated) + doNext = !doNext; + + return (doNext ? mymatch : null); + } + + boolean returnsFixedLengthMatches () + { + return true; + } + + int findFixedLengthMatches (CharIndexed input, REMatch mymatch, int max) + { + if (matchThis (input, mymatch) != null) + return max; + else + return 0; + } + + void dump (CPStringBuilder os) + { + if (where == (BEGIN | END)) + { + os.append (negated ? "\\B" : "\\b"); + } + else if (where == BEGIN) + { + os.append ("\\<"); + } + else + { + os.append ("\\>"); + } + } } |
