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org.apache.xerces.impl.xpath.regex.RangeToken Maven / Gradle / Ivy
/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.xerces.impl.xpath.regex;
/**
* This class represents a character class such as [a-z] or a period.
*
* @xerces.internal
*
* @version $Id: RangeToken.java 965250 2010-07-18 16:04:58Z mrglavas $
*/
final class RangeToken extends Token implements java.io.Serializable {
private static final long serialVersionUID = -553983121197679934L;
int[] ranges;
boolean sorted;
boolean compacted;
RangeToken icaseCache = null;
int[] map = null;
int nonMapIndex;
RangeToken(int type) {
super(type);
this.setSorted(false);
}
// for RANGE or NRANGE
protected void addRange(int start, int end) {
this.icaseCache = null;
//System.err.println("Token#addRange(): "+start+" "+end);
int r1, r2;
if (start <= end) {
r1 = start;
r2 = end;
} else {
r1 = end;
r2 = start;
}
int pos = 0;
if (this.ranges == null) {
this.ranges = new int[2];
this.ranges[0] = r1;
this.ranges[1] = r2;
this.setSorted(true);
} else {
pos = this.ranges.length;
if (this.ranges[pos-1]+1 == r1) {
this.ranges[pos-1] = r2;
return;
}
int[] temp = new int[pos+2];
System.arraycopy(this.ranges, 0, temp, 0, pos);
this.ranges = temp;
if (this.ranges[pos-1] >= r1)
this.setSorted(false);
this.ranges[pos++] = r1;
this.ranges[pos] = r2;
if (!this.sorted)
this.sortRanges();
}
}
private final boolean isSorted() {
return this.sorted;
}
private final void setSorted(boolean sort) {
this.sorted = sort;
if (!sort) this.compacted = false;
}
private final boolean isCompacted() {
return this.compacted;
}
private final void setCompacted() {
this.compacted = true;
}
protected void sortRanges() {
if (this.isSorted())
return;
if (this.ranges == null)
return;
//System.err.println("Do sorting: "+this.ranges.length);
// Bubble sort
// Why? -- In many cases,
// this.ranges has few elements.
for (int i = this.ranges.length-4; i >= 0; i -= 2) {
for (int j = 0; j <= i; j += 2) {
if (this.ranges[j] > this.ranges[j+2]
|| this.ranges[j] == this.ranges[j+2] && this.ranges[j+1] > this.ranges[j+3]) {
int tmp;
tmp = this.ranges[j+2];
this.ranges[j+2] = this.ranges[j];
this.ranges[j] = tmp;
tmp = this.ranges[j+3];
this.ranges[j+3] = this.ranges[j+1];
this.ranges[j+1] = tmp;
}
}
}
this.setSorted(true);
}
/**
* this.ranges is sorted.
*/
protected void compactRanges() {
boolean DEBUG = false;
if (this.ranges == null || this.ranges.length <= 2)
return;
if (this.isCompacted())
return;
int base = 0; // Index of writing point
int target = 0; // Index of processing point
while (target < this.ranges.length) {
if (base != target) {
this.ranges[base] = this.ranges[target++];
this.ranges[base+1] = this.ranges[target++];
} else
target += 2;
int baseend = this.ranges[base+1];
while (target < this.ranges.length) {
if (baseend+1 < this.ranges[target])
break;
if (baseend+1 == this.ranges[target]) {
if (DEBUG)
System.err.println("Token#compactRanges(): Compaction: ["+this.ranges[base]
+", "+this.ranges[base+1]
+"], ["+this.ranges[target]
+", "+this.ranges[target+1]
+"] -> ["+this.ranges[base]
+", "+this.ranges[target+1]
+"]");
this.ranges[base+1] = this.ranges[target+1];
baseend = this.ranges[base+1];
target += 2;
} else if (baseend >= this.ranges[target+1]) {
if (DEBUG)
System.err.println("Token#compactRanges(): Compaction: ["+this.ranges[base]
+", "+this.ranges[base+1]
+"], ["+this.ranges[target]
+", "+this.ranges[target+1]
+"] -> ["+this.ranges[base]
+", "+this.ranges[base+1]
+"]");
target += 2;
} else if (baseend < this.ranges[target+1]) {
if (DEBUG)
System.err.println("Token#compactRanges(): Compaction: ["+this.ranges[base]
+", "+this.ranges[base+1]
+"], ["+this.ranges[target]
+", "+this.ranges[target+1]
+"] -> ["+this.ranges[base]
+", "+this.ranges[target+1]
+"]");
this.ranges[base+1] = this.ranges[target+1];
baseend = this.ranges[base+1];
target += 2;
} else {
throw new RuntimeException("Token#compactRanges(): Internel Error: ["
+this.ranges[base]
+","+this.ranges[base+1]
+"] ["+this.ranges[target]
+","+this.ranges[target+1]+"]");
}
} // while
base += 2;
}
if (base != this.ranges.length) {
int[] result = new int[base];
System.arraycopy(this.ranges, 0, result, 0, base);
this.ranges = result;
}
this.setCompacted();
}
protected void mergeRanges(Token token) {
RangeToken tok = (RangeToken)token;
this.sortRanges();
tok.sortRanges();
if (tok.ranges == null)
return;
this.icaseCache = null;
this.setSorted(true);
if (this.ranges == null) {
this.ranges = new int[tok.ranges.length];
System.arraycopy(tok.ranges, 0, this.ranges, 0, tok.ranges.length);
return;
}
int[] result = new int[this.ranges.length+tok.ranges.length];
for (int i = 0, j = 0, k = 0; i < this.ranges.length || j < tok.ranges.length;) {
if (i >= this.ranges.length) {
result[k++] = tok.ranges[j++];
result[k++] = tok.ranges[j++];
} else if (j >= tok.ranges.length) {
result[k++] = this.ranges[i++];
result[k++] = this.ranges[i++];
} else if (tok.ranges[j] < this.ranges[i]
|| tok.ranges[j] == this.ranges[i] && tok.ranges[j+1] < this.ranges[i+1]) {
result[k++] = tok.ranges[j++];
result[k++] = tok.ranges[j++];
} else {
result[k++] = this.ranges[i++];
result[k++] = this.ranges[i++];
}
}
this.ranges = result;
}
protected void subtractRanges(Token token) {
if (token.type == NRANGE) {
this.intersectRanges(token);
return;
}
RangeToken tok = (RangeToken)token;
if (tok.ranges == null || this.ranges == null)
return;
this.icaseCache = null;
this.sortRanges();
this.compactRanges();
tok.sortRanges();
tok.compactRanges();
//System.err.println("Token#substractRanges(): Entry: "+this.ranges.length+", "+tok.ranges.length);
int[] result = new int[this.ranges.length+tok.ranges.length];
int wp = 0, src = 0, sub = 0;
while (src < this.ranges.length && sub < tok.ranges.length) {
int srcbegin = this.ranges[src];
int srcend = this.ranges[src+1];
int subbegin = tok.ranges[sub];
int subend = tok.ranges[sub+1];
if (srcend < subbegin) { // Not overlapped
// src: o-----o
// sub: o-----o
// res: o-----o
// Reuse sub
result[wp++] = this.ranges[src++];
result[wp++] = this.ranges[src++];
} else if (srcend >= subbegin
&& srcbegin <= subend) { // Overlapped
// src: o--------o
// sub: o----o
// sub: o----o
// sub: o----o
// sub: o------------o
if (subbegin <= srcbegin && srcend <= subend) {
// src: o--------o
// sub: o------------o
// res: empty
// Reuse sub
src += 2;
} else if (subbegin <= srcbegin) {
// src: o--------o
// sub: o----o
// res: o-----o
// Reuse src(=res)
this.ranges[src] = subend+1;
sub += 2;
} else if (srcend <= subend) {
// src: o--------o
// sub: o----o
// res: o-----o
// Reuse sub
result[wp++] = srcbegin;
result[wp++] = subbegin-1;
src += 2;
} else {
// src: o--------o
// sub: o----o
// res: o-o o-o
// Reuse src(=right res)
result[wp++] = srcbegin;
result[wp++] = subbegin-1;
this.ranges[src] = subend+1;
sub += 2;
}
} else if (subend < srcbegin) {
// Not overlapped
// src: o-----o
// sub: o----o
sub += 2;
} else {
throw new RuntimeException("Token#subtractRanges(): Internal Error: ["+this.ranges[src]
+","+this.ranges[src+1]
+"] - ["+tok.ranges[sub]
+","+tok.ranges[sub+1]
+"]");
}
}
while (src < this.ranges.length) {
result[wp++] = this.ranges[src++];
result[wp++] = this.ranges[src++];
}
this.ranges = new int[wp];
System.arraycopy(result, 0, this.ranges, 0, wp);
// this.ranges is sorted and compacted.
}
/**
* @param tok Ignore whether it is NRANGE or not.
*/
protected void intersectRanges(Token token) {
RangeToken tok = (RangeToken)token;
if (tok.ranges == null || this.ranges == null)
return;
this.icaseCache = null;
this.sortRanges();
this.compactRanges();
tok.sortRanges();
tok.compactRanges();
int[] result = new int[this.ranges.length+tok.ranges.length];
int wp = 0, src1 = 0, src2 = 0;
while (src1 < this.ranges.length && src2 < tok.ranges.length) {
int src1begin = this.ranges[src1];
int src1end = this.ranges[src1+1];
int src2begin = tok.ranges[src2];
int src2end = tok.ranges[src2+1];
if (src1end < src2begin) { // Not overlapped
// src1: o-----o
// src2: o-----o
// res: empty
// Reuse src2
src1 += 2;
} else if (src1end >= src2begin
&& src1begin <= src2end) { // Overlapped
// src1: o--------o
// src2: o----o
// src2: o----o
// src2: o----o
// src2: o------------o
if (src2begin <= src1begin && src1end <= src2end) {
// src1: o--------o
// src2: o------------o
// res: o--------o
// Reuse src2
result[wp++] = src1begin;
result[wp++] = src1end;
src1 += 2;
} else if (src2begin <= src1begin) {
// src1: o--------o
// src2: o----o
// res: o--o
// Reuse the rest of src1
result[wp++] = src1begin;
result[wp++] = src2end;
this.ranges[src1] = src2end+1;
src2 += 2;
} else if (src1end <= src2end) {
// src1: o--------o
// src2: o----o
// res: o--o
// Reuse src2
result[wp++] = src2begin;
result[wp++] = src1end;
src1 += 2;
} else {
// src1: o--------o
// src2: o----o
// res: o----o
// Reuse the rest of src1
result[wp++] = src2begin;
result[wp++] = src2end;
this.ranges[src1] = src2end+1;
}
} else if (src2end < src1begin) {
// Not overlapped
// src1: o-----o
// src2: o----o
src2 += 2;
} else {
throw new RuntimeException("Token#intersectRanges(): Internal Error: ["
+this.ranges[src1]
+","+this.ranges[src1+1]
+"] & ["+tok.ranges[src2]
+","+tok.ranges[src2+1]
+"]");
}
}
while (src1 < this.ranges.length) {
result[wp++] = this.ranges[src1++];
result[wp++] = this.ranges[src1++];
}
this.ranges = new int[wp];
System.arraycopy(result, 0, this.ranges, 0, wp);
// this.ranges is sorted and compacted.
}
/**
* for RANGE: Creates complement.
* for NRANGE: Creates the same meaning RANGE.
*/
static Token complementRanges(Token token) {
if (token.type != RANGE && token.type != NRANGE)
throw new IllegalArgumentException("Token#complementRanges(): must be RANGE: "+token.type);
RangeToken tok = (RangeToken)token;
tok.sortRanges();
tok.compactRanges();
int len = tok.ranges.length+2;
if (tok.ranges[0] == 0)
len -= 2;
int last = tok.ranges[tok.ranges.length-1];
if (last == UTF16_MAX)
len -= 2;
RangeToken ret = Token.createRange();
ret.ranges = new int[len];
int wp = 0;
if (tok.ranges[0] > 0) {
ret.ranges[wp++] = 0;
ret.ranges[wp++] = tok.ranges[0]-1;
}
for (int i = 1; i < tok.ranges.length-2; i += 2) {
ret.ranges[wp++] = tok.ranges[i]+1;
ret.ranges[wp++] = tok.ranges[i+1]-1;
}
if (last != UTF16_MAX) {
ret.ranges[wp++] = last+1;
ret.ranges[wp] = UTF16_MAX;
}
ret.setCompacted();
return ret;
}
synchronized RangeToken getCaseInsensitiveToken() {
if (this.icaseCache != null)
return this.icaseCache;
RangeToken uppers = this.type == Token.RANGE ? Token.createRange() : Token.createNRange();
for (int i = 0; i < this.ranges.length; i += 2) {
for (int ch = this.ranges[i]; ch <= this.ranges[i+1]; ch ++) {
if (ch > 0xffff)
uppers.addRange(ch, ch);
else {
char uch = Character.toUpperCase((char)ch);
uppers.addRange(uch, uch);
}
}
}
RangeToken lowers = this.type == Token.RANGE ? Token.createRange() : Token.createNRange();
for (int i = 0; i < uppers.ranges.length; i += 2) {
for (int ch = uppers.ranges[i]; ch <= uppers.ranges[i+1]; ch ++) {
if (ch > 0xffff)
lowers.addRange(ch, ch);
else {
char uch = Character.toLowerCase((char)ch);
lowers.addRange(uch, uch);
}
}
}
lowers.mergeRanges(uppers);
lowers.mergeRanges(this);
lowers.compactRanges();
this.icaseCache = lowers;
return lowers;
}
void dumpRanges() {
System.err.print("RANGE: ");
if (this.ranges == null) {
System.err.println(" NULL");
return;
}
for (int i = 0; i < this.ranges.length; i += 2) {
System.err.print("["+this.ranges[i]+","+this.ranges[i+1]+"] ");
}
System.err.println("");
}
boolean match(int ch) {
if (this.map == null) this.createMap();
boolean ret;
if (this.type == RANGE) {
if (ch < MAPSIZE)
return (this.map[ch/32] & (1<<(ch&0x1f))) != 0;
ret = false;
for (int i = this.nonMapIndex; i < this.ranges.length; i += 2) {
if (this.ranges[i] <= ch && ch <= this.ranges[i+1])
return true;
}
} else {
if (ch < MAPSIZE)
return (this.map[ch/32] & (1<<(ch&0x1f))) == 0;
ret = true;
for (int i = this.nonMapIndex; i < this.ranges.length; i += 2) {
if (this.ranges[i] <= ch && ch <= this.ranges[i+1])
return false;
}
}
return ret;
}
private static final int MAPSIZE = 256;
private void createMap() {
int asize = MAPSIZE/32; // 32 is the number of bits in `int'.
int [] map = new int[asize];
int nonMapIndex = this.ranges.length;
for (int i = 0; i < asize; ++i) {
map[i] = 0;
}
for (int i = 0; i < this.ranges.length; i += 2) {
int s = this.ranges[i];
int e = this.ranges[i+1];
if (s < MAPSIZE) {
for (int j = s; j <= e && j < MAPSIZE; j++) {
map[j/32] |= 1<<(j&0x1f); // s&0x1f : 0-31
}
}
else {
nonMapIndex = i;
break;
}
if (e >= MAPSIZE) {
nonMapIndex = i;
break;
}
}
this.map = map;
this.nonMapIndex = nonMapIndex;
//for (int i = 0; i < asize; i ++) System.err.println("Map: "+Integer.toString(this.map[i], 16));
}
public String toString(int options) {
String ret;
if (this.type == RANGE) {
if (this == Token.token_dot)
ret = ".";
else if (this == Token.token_0to9)
ret = "\\d";
else if (this == Token.token_wordchars)
ret = "\\w";
else if (this == Token.token_spaces)
ret = "\\s";
else {
StringBuffer sb = new StringBuffer();
sb.append('[');
for (int i = 0; i < this.ranges.length; i += 2) {
if ((options & RegularExpression.SPECIAL_COMMA) != 0 && i > 0) sb.append(',');
if (this.ranges[i] == this.ranges[i+1]) {
sb.append(escapeCharInCharClass(this.ranges[i]));
} else {
sb.append(escapeCharInCharClass(this.ranges[i]));
sb.append((char)'-');
sb.append(escapeCharInCharClass(this.ranges[i+1]));
}
}
sb.append(']');
ret = sb.toString();
}
} else {
if (this == Token.token_not_0to9)
ret = "\\D";
else if (this == Token.token_not_wordchars)
ret = "\\W";
else if (this == Token.token_not_spaces)
ret = "\\S";
else {
StringBuffer sb = new StringBuffer();
sb.append("[^");
for (int i = 0; i < this.ranges.length; i += 2) {
if ((options & RegularExpression.SPECIAL_COMMA) != 0 && i > 0) sb.append(',');
if (this.ranges[i] == this.ranges[i+1]) {
sb.append(escapeCharInCharClass(this.ranges[i]));
} else {
sb.append(escapeCharInCharClass(this.ranges[i]));
sb.append('-');
sb.append(escapeCharInCharClass(this.ranges[i+1]));
}
}
sb.append(']');
ret = sb.toString();
}
}
return ret;
}
private static String escapeCharInCharClass(int ch) {
String ret;
switch (ch) {
case '[': case ']': case '-': case '^':
case ',': case '\\':
ret = "\\"+(char)ch;
break;
case '\f': ret = "\\f"; break;
case '\n': ret = "\\n"; break;
case '\r': ret = "\\r"; break;
case '\t': ret = "\\t"; break;
case 0x1b: ret = "\\e"; break;
//case 0x0b: ret = "\\v"; break;
default:
if (ch < 0x20) {
String pre = "0"+Integer.toHexString(ch);
ret = "\\x"+pre.substring(pre.length()-2, pre.length());
} else if (ch >= 0x10000) {
String pre = "0"+Integer.toHexString(ch);
ret = "\\v"+pre.substring(pre.length()-6, pre.length());
} else
ret = ""+(char)ch;
}
return ret;
}
}
