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author | upstream source tree <ports@midipix.org> | 2015-03-15 20:14:05 -0400 |
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committer | upstream source tree <ports@midipix.org> | 2015-03-15 20:14:05 -0400 |
commit | 554fd8c5195424bdbcabf5de30fdc183aba391bd (patch) | |
tree | 976dc5ab7fddf506dadce60ae936f43f58787092 /libjava/classpath/gnu/java/util/regex/RETokenOneOf.java | |
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Diffstat (limited to 'libjava/classpath/gnu/java/util/regex/RETokenOneOf.java')
-rw-r--r-- | libjava/classpath/gnu/java/util/regex/RETokenOneOf.java | 332 |
1 files changed, 332 insertions, 0 deletions
diff --git a/libjava/classpath/gnu/java/util/regex/RETokenOneOf.java b/libjava/classpath/gnu/java/util/regex/RETokenOneOf.java new file mode 100644 index 000000000..3bea889ec --- /dev/null +++ b/libjava/classpath/gnu/java/util/regex/RETokenOneOf.java @@ -0,0 +1,332 @@ +/* gnu/regexp/RETokenOneOf.java + Copyright (C) 2006 Free Software Foundation, Inc. + +This file is part of GNU Classpath. + +GNU Classpath is free software; you can redistribute it and/or modify +it under the terms of the GNU General Public License as published by +the Free Software Foundation; either version 2, or (at your option) +any later version. + +GNU Classpath is distributed in the hope that it will be useful, but +WITHOUT ANY WARRANTY; without even the implied warranty of +MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU +General Public License for more details. + +You should have received a copy of the GNU General Public License +along with GNU Classpath; see the file COPYING. If not, write to the +Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA +02110-1301 USA. + +Linking this library statically or dynamically with other modules is +making a combined work based on this library. Thus, the terms and +conditions of the GNU General Public License cover the whole +combination. + +As a special exception, the copyright holders of this library give you +permission to link this library with independent modules to produce an +executable, regardless of the license terms of these independent +modules, and to copy and distribute the resulting executable under +terms of your choice, provided that you also meet, for each linked +independent module, the terms and conditions of the license of that +module. An independent module is a module which is not derived from +or based on this library. If you modify this library, you may extend +this exception to your version of the library, but you are not +obligated to do so. If you do not wish to do so, delete this +exception statement from your version. */ + +package gnu.java.util.regex; + +import gnu.java.lang.CPStringBuilder; + +import java.util.ArrayDeque; +import java.util.ArrayList; +import java.util.Deque; +import java.util.List; + +final class RETokenOneOf extends REToken +{ + private final List < REToken > options; + private boolean negative; + // True if this RETokenOneOf is supposed to match only one character, + // which is typically the case of a character class expression. + private boolean matchesOneChar; + + private final List < Object > addition; + // This ArrayList addition is used to store nested character classes. + // For example, if the original expression is + // [2-7a-c[f-k][m-z]&&[^p-v][st]] + // the basic part /2-7a-c/ is stored in the ArrayList options, and + // the additional part /[f-k][m-z]&&[^p-v][st]/ is stored in the + // ArrayList addition in the following order (Reverse Polish Notation): + // -- The matching result of the basic part is assumed here. + // [f-k] -- REToken + // "|" -- or + // [m-z] -- REToken + // "|" -- or + // false + // [^p-v] -- REToken + // "|" -- or + // [st] -- REToken + // "|" -- or + // "&" -- and + // + // As it is clear from the explanation above, the ArrayList addition is + // effective only when this REToken originates from a character class + // expression. + + // This constructor is used for convenience when we know the set beforehand, + // e.g. \d --> new RETokenOneOf("0123456789",false, ..) + // \D --> new RETokenOneOf("0123456789",true, ..) + + RETokenOneOf (int subIndex, String optionsStr, boolean negative, + boolean insens) + { + super (subIndex); + options = new ArrayList < REToken > (); + this.negative = negative; + for (int i = 0; i < optionsStr.length (); i++) + options.add (new RETokenChar (subIndex, optionsStr.charAt (i), insens)); + matchesOneChar = true; + addition = null; + } + + RETokenOneOf (int subIndex, List < REToken > options, boolean negative) + { + this (subIndex, options, null, negative); + } + + RETokenOneOf (int subIndex, List < REToken > options, + List < Object > addition, boolean negative) + { + super (subIndex); + this.options = options; + this.addition = addition; + this.negative = negative; + matchesOneChar = (negative || addition != null); + } + + int getMinimumLength () + { + if (matchesOneChar) + return 1; + int min = Integer.MAX_VALUE; + int x; + for (REToken t:options) + { + if ((x = t.getMinimumLength ()) < min) + min = x; + } + return min; + } + + int getMaximumLength () + { + if (matchesOneChar) + return 1; + int max = 0; + int x; + for (REToken t:options) + { + if ((x = t.getMaximumLength ()) > max) + max = x; + } + return max; + } + + boolean match (CharIndexed input, REMatch mymatch) + { + setHitEnd (input, mymatch); + if (matchesOneChar) + return matchOneChar (input, mymatch); + else + return matchOneRE (input, mymatch); + } + + boolean matchOneChar (CharIndexed input, REMatch mymatch) + { + REMatch tryMatch; + boolean tryOnly; + if (addition == null) + { + tryMatch = mymatch; + tryOnly = false; + } + else + { + tryMatch = (REMatch) mymatch.clone (); + tryOnly = true; + } + boolean b = negative ? + matchN (input, tryMatch, tryOnly) : matchP (input, tryMatch, tryOnly); + if (addition == null) + return b; + + final Deque < Boolean > stack = new ArrayDeque < Boolean > (); + stack.push (new Boolean (b)); + for (Object obj:addition) + { + if (obj instanceof REToken) + { + b = ((REToken) obj).match (input, (REMatch) mymatch.clone ()); + stack.push (new Boolean (b)); + } + else if (obj instanceof Boolean) + { + stack.push ((Boolean) obj); + } + else if (obj.equals ("|")) + { + b = stack.pop (); + b = stack.pop () || b; + stack.push (new Boolean (b)); + } + else if (obj.equals ("&")) + { + b = stack.pop (); + b = stack.pop () && b; + stack.push (new Boolean (b)); + } + else + { + throw new RuntimeException ("Invalid object found"); + } + } + if (stack.pop ()) + { + ++mymatch.index; + return next (input, mymatch); + } + return false; + } + + private boolean matchN (CharIndexed input, REMatch mymatch, boolean tryOnly) + { + if (input.charAt (mymatch.index) == CharIndexed.OUT_OF_BOUNDS) + return false; + + for (REToken tk:options) + { + REMatch tryMatch = (REMatch) mymatch.clone (); + if (tk.match (input, tryMatch)) + { // match was successful + return false; + } // is a match + } // try next option + + if (tryOnly) + return true; + ++mymatch.index; + return next (input, mymatch); + } + + private boolean matchP (CharIndexed input, REMatch mymatch, boolean tryOnly) + { + for (REToken tk:options) + { + REMatch tryMatch = (REMatch) mymatch.clone (); + if (tk.match (input, tryMatch)) + { // match was successful + if (tryOnly) + return true; + if (next (input, tryMatch)) + { + mymatch.assignFrom (tryMatch); + return true; + } + } + } + return false; + } + + private boolean matchOneRE (CharIndexed input, REMatch mymatch) + { + REMatch newMatch = findMatch (input, mymatch); + if (newMatch != null) + { + mymatch.assignFrom (newMatch); + return true; + } + return false; + } + + REMatch findMatch (CharIndexed input, REMatch mymatch) + { + if (matchesOneChar) + return super.findMatch (input, mymatch); + return findMatch (input, mymatch, 0); + } + + REMatch backtrack (CharIndexed input, REMatch mymatch, Object param) + { + return findMatch (input, mymatch, ((Integer) param).intValue ()); + } + + private REMatch findMatch (CharIndexed input, REMatch mymatch, + int optionIndex) + { + for (int i = optionIndex; i < options.size (); i++) + { + REToken tk = options.get (i); + tk = (REToken) tk.clone (); + tk.chain (getNext ()); + REMatch tryMatch = (REMatch) mymatch.clone (); + if (tryMatch.backtrackStack == null) + { + tryMatch.backtrackStack = new BacktrackStack (); + } + boolean stackPushed = false; + if (i + 1 < options.size ()) + { + tryMatch.backtrackStack.push (new BacktrackStack. + Backtrack (this, input, mymatch, + i + 1)); + stackPushed = true; + } + if (tk.match (input, tryMatch)) + { + return tryMatch; + } + if (stackPushed) + tryMatch.backtrackStack.pop (); + } + return null; + } + + boolean returnsFixedLengthMatches () + { + return matchesOneChar; + } + + int findFixedLengthMatches (CharIndexed input, REMatch mymatch, int max) + { + if (!matchesOneChar) + return super.findFixedLengthMatches (input, mymatch, max); + int numRepeats = 0; + REMatch m = (REMatch) mymatch.clone (); + REToken tk = (REToken) this.clone (); + tk.chain (null); + while (true) + { + if (numRepeats >= max) + break; + m = tk.findMatch (input, m); + if (m == null) + break; + numRepeats++; + } + return numRepeats; + } + + void dump (CPStringBuilder os) + { + os.append (negative ? "[^" : "(?:"); + for (int i = 0; i < options.size (); i++) + { + if (!negative && (i > 0)) + os.append ('|'); + options.get (i).dumpAll (os); + } + os.append (negative ? ']' : ')'); + } +} |