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CaRMtl/org/mozilla/javascript/regexp/NativeRegExp.java

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Make first real commit: copy of CaRMetal 4.2.8
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/* -*- Mode: java; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*-
*
* ***** BEGIN LICENSE BLOCK *****
* Version: MPL 1.1/GPL 2.0
*
* The contents of this file are subject to the Mozilla Public License Version
* 1.1 (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.mozilla.org/MPL/
*
* Software distributed under the License is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
* for the specific language governing rights and limitations under the
* License.
*
* The Original Code is Rhino code, released
* May 6, 1998.
*
* The Initial Developer of the Original Code is
* Netscape Communications Corporation.
* Portions created by the Initial Developer are Copyright (C) 1997-1999
* the Initial Developer. All Rights Reserved.
*
* Contributor(s):
* Norris Boyd
* Igor Bukanov
* Brendan Eich
* Matthias Radestock
*
* Alternatively, the contents of this file may be used under the terms of
* the GNU General Public License Version 2 or later (the "GPL"), in which
* case the provisions of the GPL are applicable instead of those above. If
* you wish to allow use of your version of this file only under the terms of
* the GPL and not to allow others to use your version of this file under the
* MPL, indicate your decision by deleting the provisions above and replacing
* them with the notice and other provisions required by the GPL. If you do
* not delete the provisions above, a recipient may use your version of this
* file under either the MPL or the GPL.
*
* ***** END LICENSE BLOCK ***** */
package org.mozilla.javascript.regexp;
import java.io.Serializable;
import org.mozilla.javascript.Context;
import org.mozilla.javascript.Function;
import org.mozilla.javascript.IdFunctionObject;
import org.mozilla.javascript.IdScriptableObject;
import org.mozilla.javascript.Kit;
import org.mozilla.javascript.ScriptRuntime;
import org.mozilla.javascript.Scriptable;
import org.mozilla.javascript.ScriptableObject;
import org.mozilla.javascript.Undefined;
/**
* This class implements the RegExp native object.
*
* Revision History:
* Implementation in C by Brendan Eich
* Initial port to Java by Norris Boyd from jsregexp.c version 1.36
* Merged up to version 1.38, which included Unicode support.
* Merged bug fixes in version 1.39.
* Merged JSFUN13_BRANCH changes up to 1.32.2.13
*
* @author Brendan Eich
* @author Norris Boyd
*/
public class NativeRegExp extends IdScriptableObject implements Function
{
static final long serialVersionUID = 4965263491464903264L;
private static final Object REGEXP_TAG = new Object();
public static final int JSREG_GLOB = 0x1; // 'g' flag: global
public static final int JSREG_FOLD = 0x2; // 'i' flag: fold
public static final int JSREG_MULTILINE = 0x4; // 'm' flag: multiline
//type of match to perform
public static final int TEST = 0;
public static final int MATCH = 1;
public static final int PREFIX = 2;
private static final boolean debug = false;
private static final byte REOP_EMPTY = 0; /* match rest of input against rest of r.e. */
private static final byte REOP_ALT = 1; /* alternative subexpressions in kid and next */
private static final byte REOP_BOL = 2; /* beginning of input (or line if multiline) */
private static final byte REOP_EOL = 3; /* end of input (or line if multiline) */
private static final byte REOP_WBDRY = 4; /* match "" at word boundary */
private static final byte REOP_WNONBDRY = 5; /* match "" at word non-boundary */
private static final byte REOP_QUANT = 6; /* quantified atom: atom{1,2} */
private static final byte REOP_STAR = 7; /* zero or more occurrences of kid */
private static final byte REOP_PLUS = 8; /* one or more occurrences of kid */
private static final byte REOP_OPT = 9; /* optional subexpression in kid */
private static final byte REOP_LPAREN = 10; /* left paren bytecode: kid is u.num'th sub-regexp */
private static final byte REOP_RPAREN = 11; /* right paren bytecode */
private static final byte REOP_DOT = 12; /* stands for any character */
// private static final byte REOP_CCLASS = 13; /* character class: [a-f] */
private static final byte REOP_DIGIT = 14; /* match a digit char: [0-9] */
private static final byte REOP_NONDIGIT = 15; /* match a non-digit char: [^0-9] */
private static final byte REOP_ALNUM = 16; /* match an alphanumeric char: [0-9a-z_A-Z] */
private static final byte REOP_NONALNUM = 17; /* match a non-alphanumeric char: [^0-9a-z_A-Z] */
private static final byte REOP_SPACE = 18; /* match a whitespace char */
private static final byte REOP_NONSPACE = 19; /* match a non-whitespace char */
private static final byte REOP_BACKREF = 20; /* back-reference (e.g., \1) to a parenthetical */
private static final byte REOP_FLAT = 21; /* match a flat string */
private static final byte REOP_FLAT1 = 22; /* match a single char */
private static final byte REOP_JUMP = 23; /* for deoptimized closure loops */
// private static final byte REOP_DOTSTAR = 24; /* optimize .* to use a single opcode */
// private static final byte REOP_ANCHOR = 25; /* like .* but skips left context to unanchored r.e. */
// private static final byte REOP_EOLONLY = 26; /* $ not preceded by any pattern */
// private static final byte REOP_UCFLAT = 27; /* flat Unicode string; len immediate counts chars */
private static final byte REOP_UCFLAT1 = 28; /* single Unicode char */
// private static final byte REOP_UCCLASS = 29; /* Unicode character class, vector of chars to match */
// private static final byte REOP_NUCCLASS = 30; /* negated Unicode character class */
// private static final byte REOP_BACKREFi = 31; /* case-independent REOP_BACKREF */
private static final byte REOP_FLATi = 32; /* case-independent REOP_FLAT */
private static final byte REOP_FLAT1i = 33; /* case-independent REOP_FLAT1 */
// private static final byte REOP_UCFLATi = 34; /* case-independent REOP_UCFLAT */
private static final byte REOP_UCFLAT1i = 35; /* case-independent REOP_UCFLAT1 */
// private static final byte REOP_ANCHOR1 = 36; /* first-char discriminating REOP_ANCHOR */
// private static final byte REOP_NCCLASS = 37; /* negated 8-bit character class */
// private static final byte REOP_DOTSTARMIN = 38; /* ungreedy version of REOP_DOTSTAR */
// private static final byte REOP_LPARENNON = 39; /* non-capturing version of REOP_LPAREN */
// private static final byte REOP_RPARENNON = 40; /* non-capturing version of REOP_RPAREN */
private static final byte REOP_ASSERT = 41; /* zero width positive lookahead assertion */
private static final byte REOP_ASSERT_NOT = 42; /* zero width negative lookahead assertion */
private static final byte REOP_ASSERTTEST = 43; /* sentinel at end of assertion child */
private static final byte REOP_ASSERTNOTTEST = 44; /* sentinel at end of !assertion child */
private static final byte REOP_MINIMALSTAR = 45; /* non-greedy version of * */
private static final byte REOP_MINIMALPLUS = 46; /* non-greedy version of + */
private static final byte REOP_MINIMALOPT = 47; /* non-greedy version of ? */
private static final byte REOP_MINIMALQUANT = 48; /* non-greedy version of {} */
private static final byte REOP_ENDCHILD = 49; /* sentinel at end of quantifier child */
private static final byte REOP_CLASS = 50; /* character class with index */
private static final byte REOP_REPEAT = 51; /* directs execution of greedy quantifier */
private static final byte REOP_MINIMALREPEAT = 52; /* directs execution of non-greedy quantifier */
private static final byte REOP_END = 53;
public static void init(Context cx, Scriptable scope, boolean sealed)
{
NativeRegExp proto = new NativeRegExp();
proto.re = (RECompiled)compileRE(cx, "", null, false);
proto.activatePrototypeMap(MAX_PROTOTYPE_ID);
proto.setParentScope(scope);
proto.setPrototype(getObjectPrototype(scope));
NativeRegExpCtor ctor = new NativeRegExpCtor();
// Bug #324006: ECMA-262 15.10.6.1 says "The initial value of
// RegExp.prototype.constructor is the builtin RegExp constructor."
proto.put("constructor", proto, ctor);
ScriptRuntime.setFunctionProtoAndParent(ctor, scope);
ctor.setImmunePrototypeProperty(proto);
if (sealed) {
proto.sealObject();
ctor.sealObject();
}
defineProperty(scope, "RegExp", ctor, ScriptableObject.DONTENUM);
}
NativeRegExp(Scriptable scope, Object regexpCompiled)
{
this.re = (RECompiled)regexpCompiled;
this.lastIndex = 0;
ScriptRuntime.setObjectProtoAndParent(this, scope);
}
@Override
public String getClassName()
{
return "RegExp";
}
public Object call(Context cx, Scriptable scope, Scriptable thisObj,
Object[] args)
{
return execSub(cx, scope, args, MATCH);
}
public Scriptable construct(Context cx, Scriptable scope, Object[] args)
{
return (Scriptable)execSub(cx, scope, args, MATCH);
}
Scriptable compile(Context cx, Scriptable scope, Object[] args)
{
if (args.length > 0 && args[0] instanceof NativeRegExp) {
if (args.length > 1 && args[1] != Undefined.instance) {
// report error
throw ScriptRuntime.typeError0("msg.bad.regexp.compile");
}
NativeRegExp thatObj = (NativeRegExp) args[0];
this.re = thatObj.re;
this.lastIndex = thatObj.lastIndex;
return this;
}
String s = args.length == 0 ? "" : ScriptRuntime.toString(args[0]);
String global = args.length > 1 && args[1] != Undefined.instance
? ScriptRuntime.toString(args[1])
: null;
this.re = (RECompiled)compileRE(cx, s, global, false);
this.lastIndex = 0;
return this;
}
@Override
public String toString()
{
StringBuffer buf = new StringBuffer();
buf.append('/');
if (re.source.length != 0) {
buf.append(re.source);
} else {
// See bugzilla 226045
buf.append("(?:)");
}
buf.append('/');
if ((re.flags & JSREG_GLOB) != 0)
buf.append('g');
if ((re.flags & JSREG_FOLD) != 0)
buf.append('i');
if ((re.flags & JSREG_MULTILINE) != 0)
buf.append('m');
return buf.toString();
}
NativeRegExp() { }
private static RegExpImpl getImpl(Context cx)
{
return (RegExpImpl) ScriptRuntime.getRegExpProxy(cx);
}
private Object execSub(Context cx, Scriptable scopeObj,
Object[] args, int matchType)
{
RegExpImpl reImpl = getImpl(cx);
String str;
if (args.length == 0) {
str = reImpl.input;
if (str == null) {
reportError("msg.no.re.input.for", toString());
}
} else {
str = ScriptRuntime.toString(args[0]);
}
double d = ((re.flags & JSREG_GLOB) != 0) ? lastIndex : 0;
Object rval;
if (d < 0 || str.length() < d) {
lastIndex = 0;
rval = null;
}
else {
int indexp[] = { (int)d };
rval = executeRegExp(cx, scopeObj, reImpl, str, indexp, matchType);
if ((re.flags & JSREG_GLOB) != 0) {
lastIndex = (rval == null || rval == Undefined.instance)
? 0 : indexp[0];
}
}
return rval;
}
static Object compileRE(Context cx, String str, String global, boolean flat)
{
RECompiled regexp = new RECompiled();
regexp.source = str.toCharArray();
int length = str.length();
int flags = 0;
if (global != null) {
for (int i = 0; i < global.length(); i++) {
char c = global.charAt(i);
if (c == 'g') {
flags |= JSREG_GLOB;
} else if (c == 'i') {
flags |= JSREG_FOLD;
} else if (c == 'm') {
flags |= JSREG_MULTILINE;
} else {
reportError("msg.invalid.re.flag", String.valueOf(c));
}
}
}
regexp.flags = flags;
CompilerState state = new CompilerState(cx, regexp.source, length, flags);
if (flat && length > 0) {
if (debug) {
System.out.println("flat = \"" + str + "\"");
}
state.result = new RENode(REOP_FLAT);
state.result.chr = state.cpbegin[0];
state.result.length = length;
state.result.flatIndex = 0;
state.progLength += 5;
}
else
if (!parseDisjunction(state))
return null;
regexp.program = new byte[state.progLength + 1];
if (state.classCount != 0) {
regexp.classList = new RECharSet[state.classCount];
regexp.classCount = state.classCount;
}
int endPC = emitREBytecode(state, regexp, 0, state.result);
regexp.program[endPC++] = REOP_END;
if (debug) {
System.out.println("Prog. length = " + endPC);
for (int i = 0; i < endPC; i++) {
System.out.print(regexp.program[i]);
if (i < (endPC - 1)) System.out.print(", ");
}
System.out.println();
}
regexp.parenCount = state.parenCount;
// If re starts with literal, init anchorCh accordingly
switch (regexp.program[0]) {
case REOP_UCFLAT1:
case REOP_UCFLAT1i:
regexp.anchorCh = (char)getIndex(regexp.program, 1);
break;
case REOP_FLAT1:
case REOP_FLAT1i:
regexp.anchorCh = (char)(regexp.program[1] & 0xFF);
break;
case REOP_FLAT:
case REOP_FLATi:
int k = getIndex(regexp.program, 1);
regexp.anchorCh = regexp.source[k];
break;
}
if (debug) {
if (regexp.anchorCh >= 0) {
System.out.println("Anchor ch = '" + (char)regexp.anchorCh + "'");
}
}
return regexp;
}
static boolean isDigit(char c)
{
return '0' <= c && c <= '9';
}
private static boolean isWord(char c)
{
return Character.isLetter(c) || isDigit(c) || c == '_';
}
private static boolean isLineTerm(char c)
{
return ScriptRuntime.isJSLineTerminator(c);
}
private static boolean isREWhiteSpace(int c)
{
return (c == '\u0020' || c == '\u0009'
|| c == '\n' || c == '\r'
|| c == 0x2028 || c == 0x2029
|| c == '\u000C' || c == '\u000B'
|| c == '\u00A0'
|| Character.getType((char)c) == Character.SPACE_SEPARATOR);
}
/*
*
* 1. If IgnoreCase is false, return ch.
* 2. Let u be ch converted to upper case as if by calling
* String.prototype.toUpperCase on the one-character string ch.
* 3. If u does not consist of a single character, return ch.
* 4. Let cu be u's character.
* 5. If ch's code point value is greater than or equal to decimal 128 and cu's
* code point value is less than decimal 128, then return ch.
* 6. Return cu.
*/
private static char upcase(char ch)
{
if (ch < 128) {
if ('a' <= ch && ch <= 'z') {
return (char)(ch + ('A' - 'a'));
}
return ch;
}
char cu = Character.toUpperCase(ch);
if ((ch >= 128) && (cu < 128)) return ch;
return cu;
}
private static char downcase(char ch)
{
if (ch < 128) {
if ('A' <= ch && ch <= 'Z') {
return (char)(ch + ('a' - 'A'));
}
return ch;
}
char cl = Character.toLowerCase(ch);
if ((ch >= 128) && (cl < 128)) return ch;
return cl;
}
/*
* Validates and converts hex ascii value.
*/
private static int toASCIIHexDigit(int c)
{
if (c < '0')
return -1;
if (c <= '9') {
return c - '0';
}
c |= 0x20;
if ('a' <= c && c <= 'f') {
return c - 'a' + 10;
}
return -1;
}
/*
* Top-down regular expression grammar, based closely on Perl4.
*
* regexp: altern A regular expression is one or more
* altern '|' regexp alternatives separated by vertical bar.
*/
private static boolean parseDisjunction(CompilerState state)
{
if (!parseAlternative(state))
return false;
char[] source = state.cpbegin;
int index = state.cp;
if (index != source.length && source[index] == '|') {
RENode altResult;
++state.cp;
altResult = new RENode(REOP_ALT);
altResult.kid = state.result;
if (!parseDisjunction(state))
return false;
altResult.kid2 = state.result;
state.result = altResult;
/* ALT, <next>, ..., JUMP, <end> ... JUMP <end> */
state.progLength += 9;
}
return true;
}
/*
* altern: item An alternative is one or more items,
* item altern concatenated together.
*/
private static boolean parseAlternative(CompilerState state)
{
RENode headTerm = null;
RENode tailTerm = null;
char[] source = state.cpbegin;
while (true) {
if (state.cp == state.cpend || source[state.cp] == '|'
|| (state.parenNesting != 0 && source[state.cp] == ')'))
{
if (headTerm == null) {
state.result = new RENode(REOP_EMPTY);
}
else
state.result = headTerm;
return true;
}
if (!parseTerm(state))
return false;
if (headTerm == null)
headTerm = state.result;
else {
if (tailTerm == null) {
headTerm.next = state.result;
tailTerm = state.result;
while (tailTerm.next != null) tailTerm = tailTerm.next;
}
else {
tailTerm.next = state.result;
tailTerm = tailTerm.next;
while (tailTerm.next != null) tailTerm = tailTerm.next;
}
}
}
}
/* calculate the total size of the bitmap required for a class expression */
private static boolean
calculateBitmapSize(CompilerState state, RENode target, char[] src,
int index, int end)
{
char rangeStart = 0;
char c;
int n;
int nDigits;
int i;
int max = 0;
boolean inRange = false;
target.bmsize = 0;
if (index == end)
return true;
if (src[index] == '^')
++index;
while (index != end) {
int localMax = 0;
nDigits = 2;
switch (src[index]) {
case '\\':
++index;
c = src[index++];
switch (c) {
case 'b':
localMax = 0x8;
break;
case 'f':
localMax = 0xC;
break;
case 'n':
localMax = 0xA;
break;
case 'r':
localMax = 0xD;
break;
case 't':
localMax = 0x9;
break;
case 'v':
localMax = 0xB;
break;
case 'c':
if (((index + 1) < end) && Character.isLetter(src[index + 1]))
localMax = (char)(src[index++] & 0x1F);
else
localMax = '\\';
break;
case 'u':
nDigits += 2;
// fall thru...
case 'x':
n = 0;
for (i = 0; (i < nDigits) && (index < end); i++) {
c = src[index++];
n = Kit.xDigitToInt(c, n);
if (n < 0) {
// Back off to accepting the original
// '\' as a literal
index -= (i + 1);
n = '\\';
break;
}
}
localMax = n;
break;
case 'd':
if (inRange) {
reportError("msg.bad.range", "");
return false;
}
localMax = '9';
break;
case 'D':
case 's':
case 'S':
case 'w':
case 'W':
if (inRange) {
reportError("msg.bad.range", "");
return false;
}
target.bmsize = 65535;
return true;
case '0':
case '1':
case '2':
case '3':
case '4':
case '5':
case '6':
case '7':
/*
* This is a non-ECMA extension - decimal escapes (in this
* case, octal!) are supposed to be an error inside class
* ranges, but supported here for backwards compatibility.
*
*/
n = (c - '0');
c = src[index];
if ('0' <= c && c <= '7') {
index++;
n = 8 * n + (c - '0');
c = src[index];
if ('0' <= c && c <= '7') {
index++;
i = 8 * n + (c - '0');
if (i <= 0377)
n = i;
else
index--;
}
}
localMax = n;
break;
default:
localMax = c;
break;
}
break;
default:
localMax = src[index++];
break;
}
if (inRange) {
if (rangeStart > localMax) {
reportError("msg.bad.range", "");
return false;
}
inRange = false;
}
else {
if (index < (end - 1)) {
if (src[index] == '-') {
++index;
inRange = true;
rangeStart = (char)localMax;
continue;
}
}
}
if ((state.flags & JSREG_FOLD) != 0){
char cu = upcase((char)localMax);
char cd = downcase((char)localMax);
localMax = (cu >= cd) ? cu : cd;
}
if (localMax > max)
max = localMax;
}
target.bmsize = max;
return true;
}
/*
* item: assertion An item is either an assertion or
* quantatom a quantified atom.
*
* assertion: '^' Assertions match beginning of string
* (or line if the class static property
* RegExp.multiline is true).
* '$' End of string (or line if the class
* static property RegExp.multiline is
* true).
* '\b' Word boundary (between \w and \W).
* '\B' Word non-boundary.
*
* quantatom: atom An unquantified atom.
* quantatom '{' n ',' m '}'
* Atom must occur between n and m times.
* quantatom '{' n ',' '}' Atom must occur at least n times.
* quantatom '{' n '}' Atom must occur exactly n times.
* quantatom '*' Zero or more times (same as {0,}).
* quantatom '+' One or more times (same as {1,}).
* quantatom '?' Zero or one time (same as {0,1}).
*
* any of which can be optionally followed by '?' for ungreedy
*
* atom: '(' regexp ')' A parenthesized regexp (what matched
* can be addressed using a backreference,
* see '\' n below).
* '.' Matches any char except '\n'.
* '[' classlist ']' A character class.
* '[' '^' classlist ']' A negated character class.
* '\f' Form Feed.
* '\n' Newline (Line Feed).
* '\r' Carriage Return.
* '\t' Horizontal Tab.
* '\v' Vertical Tab.
* '\d' A digit (same as [0-9]).
* '\D' A non-digit.
* '\w' A word character, [0-9a-z_A-Z].
* '\W' A non-word character.
* '\s' A whitespace character, [ \b\f\n\r\t\v].
* '\S' A non-whitespace character.
* '\' n A backreference to the nth (n decimal
* and positive) parenthesized expression.
* '\' octal An octal escape sequence (octal must be
* two or three digits long, unless it is
* 0 for the null character).
* '\x' hex A hex escape (hex must be two digits).
* '\c' ctrl A control character, ctrl is a letter.
* '\' literalatomchar Any character except one of the above
* that follow '\' in an atom.
* otheratomchar Any character not first among the other
* atom right-hand sides.
*/
private static void doFlat(CompilerState state, char c)
{
state.result = new RENode(REOP_FLAT);
state.result.chr = c;
state.result.length = 1;
state.result.flatIndex = -1;
state.progLength += 3;
}
private static int
getDecimalValue(char c, CompilerState state, int maxValue,
String overflowMessageId)
{
boolean overflow = false;
int start = state.cp;
char[] src = state.cpbegin;
int value = c - '0';
for (; state.cp != state.cpend; ++state.cp) {
c = src[state.cp];
if (!isDigit(c)) {
break;
}
if (!overflow) {
int digit = c - '0';
if (value < (maxValue - digit) / 10) {
value = value * 10 + digit;
} else {
overflow = true;
value = maxValue;
}
}
}
if (overflow) {
reportError(overflowMessageId,
String.valueOf(src, start, state.cp - start));
}
return value;
}
private static boolean
parseTerm(CompilerState state)
{
char[] src = state.cpbegin;
char c = src[state.cp++];
int nDigits = 2;
int parenBaseCount = state.parenCount;
int num, tmp;
RENode term;
int termStart;
switch (c) {
/* assertions and atoms */
case '^':
state.result = new RENode(REOP_BOL);
state.progLength++;
return true;
case '$':
state.result = new RENode(REOP_EOL);
state.progLength++;
return true;
case '\\':
if (state.cp < state.cpend) {
c = src[state.cp++];
switch (c) {
/* assertion escapes */
case 'b' :
state.result = new RENode(REOP_WBDRY);
state.progLength++;
return true;
case 'B':
state.result = new RENode(REOP_WNONBDRY);
state.progLength++;
return true;
/* Decimal escape */
case '0':
/*
* Under 'strict' ECMA 3, we interpret \0 as NUL and don't accept octal.
* However, (XXX and since Rhino doesn't have a 'strict' mode) we'll just
* behave the old way for compatibility reasons.
* (see http://bugzilla.mozilla.org/show_bug.cgi?id=141078)
*
*/
reportWarning(state.cx, "msg.bad.backref", "");
/* octal escape */
num = 0;
while (state.cp < state.cpend) {
c = src[state.cp];
if ((c >= '0') && (c <= '7')) {
state.cp++;
tmp = 8 * num + (c - '0');
if (tmp > 0377)
break;
num = tmp;
}
else
break;
}
c = (char)(num);
doFlat(state, c);
break;
case '1':
case '2':
case '3':
case '4':
case '5':
case '6':
case '7':
case '8':
case '9':
termStart = state.cp - 1;
num = getDecimalValue(c, state, 0xFFFF,
"msg.overlarge.backref");
if (num > state.parenCount)
reportWarning(state.cx, "msg.bad.backref", "");
/*
* n > 9 or > count of parentheses,
* then treat as octal instead.
*/
if ((num > 9) && (num > state.parenCount)) {
state.cp = termStart;
num = 0;
while (state.cp < state.cpend) {
c = src[state.cp];
if ((c >= '0') && (c <= '7')) {
state.cp++;
tmp = 8 * num + (c - '0');
if (tmp > 0377)
break;
num = tmp;
}
else
break;
}
c = (char)(num);
doFlat(state, c);
break;
}
/* otherwise, it's a back-reference */
state.result = new RENode(REOP_BACKREF);
state.result.parenIndex = num - 1;
state.progLength += 3;
break;
/* Control escape */
case 'f':
c = 0xC;
doFlat(state, c);
break;
case 'n':
c = 0xA;
doFlat(state, c);
break;
case 'r':
c = 0xD;
doFlat(state, c);
break;
case 't':
c = 0x9;
doFlat(state, c);
break;
case 'v':
c = 0xB;
doFlat(state, c);
break;
/* Control letter */
case 'c':
if (((state.cp + 1) < state.cpend) &&
Character.isLetter(src[state.cp + 1]))
c = (char)(src[state.cp++] & 0x1F);
else {
/* back off to accepting the original '\' as a literal */
--state.cp;
c = '\\';
}
doFlat(state, c);
break;
/* UnicodeEscapeSequence */
case 'u':
nDigits += 2;
// fall thru...
/* HexEscapeSequence */
case 'x':
{
int n = 0;
int i;
for (i = 0; (i < nDigits)
&& (state.cp < state.cpend); i++) {
c = src[state.cp++];
n = Kit.xDigitToInt(c, n);
if (n < 0) {
// Back off to accepting the original
// 'u' or 'x' as a literal
state.cp -= (i + 2);
n = src[state.cp++];
break;
}
}
c = (char)(n);
}
doFlat(state, c);
break;
/* Character class escapes */
case 'd':
state.result = new RENode(REOP_DIGIT);
state.progLength++;
break;
case 'D':
state.result = new RENode(REOP_NONDIGIT);
state.progLength++;
break;
case 's':
state.result = new RENode(REOP_SPACE);
state.progLength++;
break;
case 'S':
state.result = new RENode(REOP_NONSPACE);
state.progLength++;
break;
case 'w':
state.result = new RENode(REOP_ALNUM);
state.progLength++;
break;
case 'W':
state.result = new RENode(REOP_NONALNUM);
state.progLength++;
break;
/* IdentityEscape */
default:
state.result = new RENode(REOP_FLAT);
state.result.chr = c;
state.result.length = 1;
state.result.flatIndex = state.cp - 1;
state.progLength += 3;
break;
}
break;
}
else {
/* a trailing '\' is an error */
reportError("msg.trail.backslash", "");
return false;
}
case '(': {
RENode result = null;
termStart = state.cp;
if (state.cp + 1 < state.cpend && src[state.cp] == '?'
&& ((c = src[state.cp + 1]) == '=' || c == '!' || c == ':'))
{
state.cp += 2;
if (c == '=') {
result = new RENode(REOP_ASSERT);
/* ASSERT, <next>, ... ASSERTTEST */
state.progLength += 4;
} else if (c == '!') {
result = new RENode(REOP_ASSERT_NOT);
/* ASSERTNOT, <next>, ... ASSERTNOTTEST */
state.progLength += 4;
}
} else {
result = new RENode(REOP_LPAREN);
/* LPAREN, <index>, ... RPAREN, <index> */
state.progLength += 6;
result.parenIndex = state.parenCount++;
}
++state.parenNesting;
if (!parseDisjunction(state))
return false;
if (state.cp == state.cpend || src[state.cp] != ')') {
reportError("msg.unterm.paren", "");
return false;
}
++state.cp;
--state.parenNesting;
if (result != null) {
result.kid = state.result;
state.result = result;
}
break;
}
case ')':
reportError("msg.re.unmatched.right.paren", "");
return false;
case '[':
state.result = new RENode(REOP_CLASS);
termStart = state.cp;
state.result.startIndex = termStart;
while (true) {
if (state.cp == state.cpend) {
reportError("msg.unterm.class", "");
return false;
}
if (src[state.cp] == '\\')
state.cp++;
else {
if (src[state.cp] == ']') {
state.result.kidlen = state.cp - termStart;
break;
}
}
state.cp++;
}
state.result.index = state.classCount++;
/*
* Call calculateBitmapSize now as we want any errors it finds
* to be reported during the parse phase, not at execution.
*/
if (!calculateBitmapSize(state, state.result, src, termStart, state.cp++))
return false;
state.progLength += 3; /* CLASS, <index> */
break;
case '.':
state.result = new RENode(REOP_DOT);
state.progLength++;
break;
case '*':
case '+':
case '?':
reportError("msg.bad.quant", String.valueOf(src[state.cp - 1]));
return false;
default:
state.result = new RENode(REOP_FLAT);
state.result.chr = c;
state.result.length = 1;
state.result.flatIndex = state.cp - 1;
state.progLength += 3;
break;
}
term = state.result;
if (state.cp == state.cpend) {
return true;
}
boolean hasQ = false;
switch (src[state.cp]) {
case '+':
state.result = new RENode(REOP_QUANT);
state.result.min = 1;
state.result.max = -1;
/* <PLUS>, <parencount>, <parenindex>, <next> ... <ENDCHILD> */
state.progLength += 8;
hasQ = true;
break;
case '*':
state.result = new RENode(REOP_QUANT);
state.result.min = 0;
state.result.max = -1;
/* <STAR>, <parencount>, <parenindex>, <next> ... <ENDCHILD> */
state.progLength += 8;
hasQ = true;
break;
case '?':
state.result = new RENode(REOP_QUANT);
state.result.min = 0;
state.result.max = 1;
/* <OPT>, <parencount>, <parenindex>, <next> ... <ENDCHILD> */
state.progLength += 8;
hasQ = true;
break;
case '{': /* balance '}' */
{
int min = 0;
int max = -1;
int leftCurl = state.cp;
/* For Perl etc. compatibility, if quntifier does not match
* \{\d+(,\d*)?\} exactly back off from it
* being a quantifier, and chew it up as a literal
* atom next time instead.
*/
c = src[++state.cp];
if (isDigit(c)) {
++state.cp;
min = getDecimalValue(c, state, 0xFFFF,
"msg.overlarge.min");
c = src[state.cp];
if (c == ',') {
c = src[++state.cp];
if (isDigit(c)) {
++state.cp;
max = getDecimalValue(c, state, 0xFFFF,
"msg.overlarge.max");
c = src[state.cp];
if (min > max) {
reportError("msg.max.lt.min",
String.valueOf(src[state.cp]));
return false;
}
}
} else {
max = min;
}
/* balance '{' */
if (c == '}') {
state.result = new RENode(REOP_QUANT);
state.result.min = min;
state.result.max = max;
// QUANT, <min>, <max>, <parencount>,
// <parenindex>, <next> ... <ENDCHILD>
state.progLength += 12;
hasQ = true;
}
}
if (!hasQ) {
state.cp = leftCurl;
}
break;
}
}
if (!hasQ)
return true;
++state.cp;
state.result.kid = term;
state.result.parenIndex = parenBaseCount;
state.result.parenCount = state.parenCount - parenBaseCount;
if ((state.cp < state.cpend) && (src[state.cp] == '?')) {
++state.cp;
state.result.greedy = false;
}
else
state.result.greedy = true;
return true;
}
private static void resolveForwardJump(byte[] array, int from, int pc)
{
if (from > pc) throw Kit.codeBug();
addIndex(array, from, pc - from);
}
private static int getOffset(byte[] array, int pc)
{
return getIndex(array, pc);
}
private static int addIndex(byte[] array, int pc, int index)
{
if (index < 0) throw Kit.codeBug();
if (index > 0xFFFF)
throw Context.reportRuntimeError("Too complex regexp");
array[pc] = (byte)(index >> 8);
array[pc + 1] = (byte)(index);
return pc + 2;
}
private static int getIndex(byte[] array, int pc)
{
return ((array[pc] & 0xFF) << 8) | (array[pc + 1] & 0xFF);
}
private static final int OFFSET_LEN = 2;
private static final int INDEX_LEN = 2;
private static int
emitREBytecode(CompilerState state, RECompiled re, int pc, RENode t)
{
RENode nextAlt;
int nextAltFixup, nextTermFixup;
byte[] program = re.program;
while (t != null) {
program[pc++] = t.op;
switch (t.op) {
case REOP_EMPTY:
--pc;
break;
case REOP_ALT:
nextAlt = t.kid2;
nextAltFixup = pc; /* address of next alternate */
pc += OFFSET_LEN;
pc = emitREBytecode(state, re, pc, t.kid);
program[pc++] = REOP_JUMP;
nextTermFixup = pc; /* address of following term */
pc += OFFSET_LEN;
resolveForwardJump(program, nextAltFixup, pc);
pc = emitREBytecode(state, re, pc, nextAlt);
program[pc++] = REOP_JUMP;
nextAltFixup = pc;
pc += OFFSET_LEN;
resolveForwardJump(program, nextTermFixup, pc);
resolveForwardJump(program, nextAltFixup, pc);
break;
case REOP_FLAT:
/*
* Consecutize FLAT's if possible.
*/
if (t.flatIndex != -1) {
while ((t.next != null) && (t.next.op == REOP_FLAT)
&& ((t.flatIndex + t.length)
== t.next.flatIndex)) {
t.length += t.next.length;
t.next = t.next.next;
}
}
if ((t.flatIndex != -1) && (t.length > 1)) {
if ((state.flags & JSREG_FOLD) != 0)
program[pc - 1] = REOP_FLATi;
else
program[pc - 1] = REOP_FLAT;
pc = addIndex(program, pc, t.flatIndex);
pc = addIndex(program, pc, t.length);
}
else {
if (t.chr < 256) {
if ((state.flags & JSREG_FOLD) != 0)
program[pc - 1] = REOP_FLAT1i;
else
program[pc - 1] = REOP_FLAT1;
program[pc++] = (byte)(t.chr);
}
else {
if ((state.flags & JSREG_FOLD) != 0)
program[pc - 1] = REOP_UCFLAT1i;
else
program[pc - 1] = REOP_UCFLAT1;
pc = addIndex(program, pc, t.chr);
}
}
break;
case REOP_LPAREN:
pc = addIndex(program, pc, t.parenIndex);
pc = emitREBytecode(state, re, pc, t.kid);
program[pc++] = REOP_RPAREN;
pc = addIndex(program, pc, t.parenIndex);
break;
case REOP_BACKREF:
pc = addIndex(program, pc, t.parenIndex);
break;
case REOP_ASSERT:
nextTermFixup = pc;
pc += OFFSET_LEN;
pc = emitREBytecode(state, re, pc, t.kid);
program[pc++] = REOP_ASSERTTEST;
resolveForwardJump(program, nextTermFixup, pc);
break;
case REOP_ASSERT_NOT:
nextTermFixup = pc;
pc += OFFSET_LEN;
pc = emitREBytecode(state, re, pc, t.kid);
program[pc++] = REOP_ASSERTNOTTEST;
resolveForwardJump(program, nextTermFixup, pc);
break;
case REOP_QUANT:
if ((t.min == 0) && (t.max == -1))
program[pc - 1] = (t.greedy) ? REOP_STAR : REOP_MINIMALSTAR;
else
if ((t.min == 0) && (t.max == 1))
program[pc - 1] = (t.greedy) ? REOP_OPT : REOP_MINIMALOPT;
else
if ((t.min == 1) && (t.max == -1))
program[pc - 1] = (t.greedy) ? REOP_PLUS : REOP_MINIMALPLUS;
else {
if (!t.greedy) program[pc - 1] = REOP_MINIMALQUANT;
pc = addIndex(program, pc, t.min);
// max can be -1 which addIndex does not accept
pc = addIndex(program, pc, t.max + 1);
}
pc = addIndex(program, pc, t.parenCount);
pc = addIndex(program, pc, t.parenIndex);
nextTermFixup = pc;
pc += OFFSET_LEN;
pc = emitREBytecode(state, re, pc, t.kid);
program[pc++] = REOP_ENDCHILD;
resolveForwardJump(program, nextTermFixup, pc);
break;
case REOP_CLASS:
pc = addIndex(program, pc, t.index);
re.classList[t.index] = new RECharSet(t.bmsize, t.startIndex,
t.kidlen);
break;
default:
break;
}
t = t.next;
}
return pc;
}
private static void
pushProgState(REGlobalData gData, int min, int max,
REBackTrackData backTrackLastToSave,
int continuation_pc, int continuation_op)
{
gData.stateStackTop = new REProgState(gData.stateStackTop, min, max,
gData.cp, backTrackLastToSave,
continuation_pc,
continuation_op);
}
private static REProgState
popProgState(REGlobalData gData)
{
REProgState state = gData.stateStackTop;
gData.stateStackTop = state.previous;
return state;
}
private static void
pushBackTrackState(REGlobalData gData, byte op, int target)
{
gData.backTrackStackTop = new REBackTrackData(gData, op, target);
}
/*
* Consecutive literal characters.
*/
private static boolean
flatNMatcher(REGlobalData gData, int matchChars,
int length, char[] chars, int end)
{
if ((gData.cp + length) > end)
return false;
for (int i = 0; i < length; i++) {
if (gData.regexp.source[matchChars + i] != chars[gData.cp + i]) {
return false;
}
}
gData.cp += length;
return true;
}
private static boolean
flatNIMatcher(REGlobalData gData, int matchChars,
int length, char[] chars, int end)
{
if ((gData.cp + length) > end)
return false;
for (int i = 0; i < length; i++) {
if (upcase(gData.regexp.source[matchChars + i])
!= upcase(chars[gData.cp + i]))
{
return false;
}
}
gData.cp += length;
return true;
}
/*
1. Evaluate DecimalEscape to obtain an EscapeValue E.
2. If E is not a character then go to step 6.
3. Let ch be E's character.
4. Let A be a one-element RECharSet containing the character ch.
5. Call CharacterSetMatcher(A, false) and return its Matcher result.
6. E must be an integer. Let n be that integer.
7. If n=0 or n>NCapturingParens then throw a SyntaxError exception.
8. Return an internal Matcher closure that takes two arguments, a State x
and a Continuation c, and performs the following:
1. Let cap be x's captures internal array.
2. Let s be cap[n].
3. If s is undefined, then call c(x) and return its result.
4. Let e be x's endIndex.
5. Let len be s's length.
6. Let f be e+len.
7. If f>InputLength, return failure.
8. If there exists an integer i between 0 (inclusive) and len (exclusive)
such that Canonicalize(s[i]) is not the same character as
Canonicalize(Input [e+i]), then return failure.
9. Let y be the State (f, cap).
10. Call c(y) and return its result.
*/
private static boolean
backrefMatcher(REGlobalData gData, int parenIndex,
char[] chars, int end)
{
int len;
int i;
int parenContent = gData.parens_index(parenIndex);
if (parenContent == -1)
return true;
len = gData.parens_length(parenIndex);
if ((gData.cp + len) > end)
return false;
if ((gData.regexp.flags & JSREG_FOLD) != 0) {
for (i = 0; i < len; i++) {
if (upcase(chars[parenContent + i]) != upcase(chars[gData.cp + i]))
return false;
}
}
else {
for (i = 0; i < len; i++) {
if (chars[parenContent + i] != chars[gData.cp + i])
return false;
}
}
gData.cp += len;
return true;
}
/* Add a single character to the RECharSet */
private static void
addCharacterToCharSet(RECharSet cs, char c)
{
int byteIndex = (c / 8);
if (c > cs.length)
throw new RuntimeException();
cs.bits[byteIndex] |= 1 << (c & 0x7);
}
/* Add a character range, c1 to c2 (inclusive) to the RECharSet */
private static void
addCharacterRangeToCharSet(RECharSet cs, char c1, char c2)
{
int i;
int byteIndex1 = (c1 / 8);
int byteIndex2 = (c2 / 8);
if ((c2 > cs.length) || (c1 > c2))
throw new RuntimeException();
c1 &= 0x7;
c2 &= 0x7;
if (byteIndex1 == byteIndex2) {
cs.bits[byteIndex1] |= ((0xFF) >> (7 - (c2 - c1))) << c1;
}
else {
cs.bits[byteIndex1] |= 0xFF << c1;
for (i = byteIndex1 + 1; i < byteIndex2; i++)
cs.bits[i] = (byte)0xFF;
cs.bits[byteIndex2] |= (0xFF) >> (7 - c2);
}
}
/* Compile the source of the class into a RECharSet */
private static void
processCharSet(REGlobalData gData, RECharSet charSet)
{
synchronized (charSet) {
if (!charSet.converted) {
processCharSetImpl(gData, charSet);
charSet.converted = true;
}
}
}
private static void
processCharSetImpl(REGlobalData gData, RECharSet charSet)
{
int src = charSet.startIndex;
int end = src + charSet.strlength;
char rangeStart = 0, thisCh;
int byteLength;
char c;
int n;
int nDigits;
int i;
boolean inRange = false;
charSet.sense = true;
byteLength = (charSet.length / 8) + 1;
charSet.bits = new byte[byteLength];
if (src == end)
return;
if (gData.regexp.source[src] == '^') {
charSet.sense = false;
++src;
}
while (src != end) {
nDigits = 2;
switch (gData.regexp.source[src]) {
case '\\':
++src;
c = gData.regexp.source[src++];
switch (c) {
case 'b':
thisCh = 0x8;
break;
case 'f':
thisCh = 0xC;
break;
case 'n':
thisCh = 0xA;
break;
case 'r':
thisCh = 0xD;
break;
case 't':
thisCh = 0x9;
break;
case 'v':
thisCh = 0xB;
break;
case 'c':
if (((src + 1) < end) && isWord(gData.regexp.source[src + 1]))
thisCh = (char)(gData.regexp.source[src++] & 0x1F);
else {
--src;
thisCh = '\\';
}
break;
case 'u':
nDigits += 2;
// fall thru
case 'x':
n = 0;
for (i = 0; (i < nDigits) && (src < end); i++) {
c = gData.regexp.source[src++];
int digit = toASCIIHexDigit(c);
if (digit < 0) {
/* back off to accepting the original '\'
* as a literal
*/
src -= (i + 1);
n = '\\';
break;
}
n = (n << 4) | digit;
}
thisCh = (char)(n);
break;
case '0':
case '1':
case '2':
case '3':
case '4':
case '5':
case '6':
case '7':
/*
* This is a non-ECMA extension - decimal escapes (in this
* case, octal!) are supposed to be an error inside class
* ranges, but supported here for backwards compatibility.
*
*/
n = (c - '0');
c = gData.regexp.source[src];
if ('0' <= c && c <= '7') {
src++;
n = 8 * n + (c - '0');
c = gData.regexp.source[src];
if ('0' <= c && c <= '7') {
src++;
i = 8 * n + (c - '0');
if (i <= 0377)
n = i;
else
src--;
}
}
thisCh = (char)(n);
break;
case 'd':
addCharacterRangeToCharSet(charSet, '0', '9');
continue; /* don't need range processing */
case 'D':
addCharacterRangeToCharSet(charSet, (char)0, (char)('0' - 1));
addCharacterRangeToCharSet(charSet, (char)('9' + 1),
(char)(charSet.length));
continue;
case 's':
for (i = charSet.length; i >= 0; i--)
if (isREWhiteSpace(i))
addCharacterToCharSet(charSet, (char)(i));
continue;
case 'S':
for (i = charSet.length; i >= 0; i--)
if (!isREWhiteSpace(i))
addCharacterToCharSet(charSet, (char)(i));
continue;
case 'w':
for (i = charSet.length; i >= 0; i--)
if (isWord((char)i))
addCharacterToCharSet(charSet, (char)(i));
continue;
case 'W':
for (i = charSet.length; i >= 0; i--)
if (!isWord((char)i))
addCharacterToCharSet(charSet, (char)(i));
continue;
default:
thisCh = c;
break;
}
break;
default:
thisCh = gData.regexp.source[src++];
break;
}
if (inRange) {
if ((gData.regexp.flags & JSREG_FOLD) != 0) {
addCharacterRangeToCharSet(charSet,
upcase(rangeStart),
upcase(thisCh));
addCharacterRangeToCharSet(charSet,
downcase(rangeStart),
downcase(thisCh));
} else {
addCharacterRangeToCharSet(charSet, rangeStart, thisCh);
}
inRange = false;
}
else {
if ((gData.regexp.flags & JSREG_FOLD) != 0) {
addCharacterToCharSet(charSet, upcase(thisCh));
addCharacterToCharSet(charSet, downcase(thisCh));
} else {
addCharacterToCharSet(charSet, thisCh);
}
if (src < (end - 1)) {
if (gData.regexp.source[src] == '-') {
++src;
inRange = true;
rangeStart = thisCh;
}
}
}
}
}
/*
* Initialize the character set if it this is the first call.
* Test the bit - if the ^ flag was specified, non-inclusion is a success
*/
private static boolean
classMatcher(REGlobalData gData, RECharSet charSet, char ch)
{
if (!charSet.converted) {
processCharSet(gData, charSet);
}
int byteIndex = ch / 8;
if (charSet.sense) {
if ((charSet.length == 0) ||
( (ch > charSet.length)
|| ((charSet.bits[byteIndex] & (1 << (ch & 0x7))) == 0) ))
return false;
} else {
if (! ((charSet.length == 0) ||
( (ch > charSet.length)
|| ((charSet.bits[byteIndex] & (1 << (ch & 0x7))) == 0) )))
return false;
}
return true;
}
private static boolean
executeREBytecode(REGlobalData gData, char[] chars, int end)
{
int pc = 0;
byte program[] = gData.regexp.program;
int currentContinuation_op;
int currentContinuation_pc;
boolean result = false;
currentContinuation_pc = 0;
currentContinuation_op = REOP_END;
if (debug) {
System.out.println("Input = \"" + new String(chars) + "\", start at " + gData.cp);
}
int op = program[pc++];
for (;;) {
if (debug) {
System.out.println("Testing at " + gData.cp + ", op = " + op);
}
switch (op) {
case REOP_EMPTY:
result = true;
break;
case REOP_BOL:
if (gData.cp != 0) {
if (gData.multiline ||
((gData.regexp.flags & JSREG_MULTILINE) != 0)) {
if (!isLineTerm(chars[gData.cp - 1])) {
result = false;
break;
}
}
else {
result = false;
break;
}
}
result = true;
break;
case REOP_EOL:
if (gData.cp != end) {
if (gData.multiline ||
((gData.regexp.flags & JSREG_MULTILINE) != 0)) {
if (!isLineTerm(chars[gData.cp])) {
result = false;
break;
}
}
else {
result = false;
break;
}
}
result = true;
break;
case REOP_WBDRY:
result = ((gData.cp == 0 || !isWord(chars[gData.cp - 1]))
^ !((gData.cp < end) && isWord(chars[gData.cp])));
break;
case REOP_WNONBDRY:
result = ((gData.cp == 0 || !isWord(chars[gData.cp - 1]))
^ ((gData.cp < end) && isWord(chars[gData.cp])));
break;
case REOP_DOT:
result = (gData.cp != end && !isLineTerm(chars[gData.cp]));
if (result) {
gData.cp++;
}
break;
case REOP_DIGIT:
result = (gData.cp != end && isDigit(chars[gData.cp]));
if (result) {
gData.cp++;
}
break;
case REOP_NONDIGIT:
result = (gData.cp != end && !isDigit(chars[gData.cp]));
if (result) {
gData.cp++;
}
break;
case REOP_SPACE:
result = (gData.cp != end && isREWhiteSpace(chars[gData.cp]));
if (result) {
gData.cp++;
}
break;
case REOP_NONSPACE:
result = (gData.cp != end && !isREWhiteSpace(chars[gData.cp]));
if (result) {
gData.cp++;
}
break;
case REOP_ALNUM:
result = (gData.cp != end && isWord(chars[gData.cp]));
if (result) {
gData.cp++;
}
break;
case REOP_NONALNUM:
result = (gData.cp != end && !isWord(chars[gData.cp]));
if (result) {
gData.cp++;
}
break;
case REOP_FLAT:
{
int offset = getIndex(program, pc);
pc += INDEX_LEN;
int length = getIndex(program, pc);
pc += INDEX_LEN;
result = flatNMatcher(gData, offset, length, chars, end);
}
break;
case REOP_FLATi:
{
int offset = getIndex(program, pc);
pc += INDEX_LEN;
int length = getIndex(program, pc);
pc += INDEX_LEN;
result = flatNIMatcher(gData, offset, length, chars, end);
}
break;
case REOP_FLAT1:
{
char matchCh = (char)(program[pc++] & 0xFF);
result = (gData.cp != end && chars[gData.cp] == matchCh);
if (result) {
gData.cp++;
}
}
break;
case REOP_FLAT1i:
{
char matchCh = (char)(program[pc++] & 0xFF);
result = (gData.cp != end
&& upcase(chars[gData.cp]) == upcase(matchCh));
if (result) {
gData.cp++;
}
}
break;
case REOP_UCFLAT1:
{
char matchCh = (char)getIndex(program, pc);
pc += INDEX_LEN;
result = (gData.cp != end && chars[gData.cp] == matchCh);
if (result) {
gData.cp++;
}
}
break;
case REOP_UCFLAT1i:
{
char matchCh = (char)getIndex(program, pc);
pc += INDEX_LEN;
result = (gData.cp != end
&& upcase(chars[gData.cp]) == upcase(matchCh));
if (result) {
gData.cp++;
}
}
break;
case REOP_ALT:
{
int nextpc;
byte nextop;
pushProgState(gData, 0, 0, null,
currentContinuation_pc,
currentContinuation_op);
nextpc = pc + getOffset(program, pc);
nextop = program[nextpc++];
pushBackTrackState(gData, nextop, nextpc);
pc += INDEX_LEN;
op = program[pc++];
}
continue;
case REOP_JUMP:
{
int offset;
REProgState state = popProgState(gData);
currentContinuation_pc = state.continuation_pc;
currentContinuation_op = state.continuation_op;
offset = getOffset(program, pc);
pc += offset;
op = program[pc++];
}
continue;
case REOP_LPAREN:
{
int parenIndex = getIndex(program, pc);
pc += INDEX_LEN;
gData.set_parens(parenIndex, gData.cp, 0);
op = program[pc++];
}
continue;
case REOP_RPAREN:
{
int cap_index;
int parenIndex = getIndex(program, pc);
pc += INDEX_LEN;
cap_index = gData.parens_index(parenIndex);
gData.set_parens(parenIndex, cap_index,
gData.cp - cap_index);
if (parenIndex > gData.lastParen)
gData.lastParen = parenIndex;
op = program[pc++];
}
continue;
case REOP_BACKREF:
{
int parenIndex = getIndex(program, pc);
pc += INDEX_LEN;
result = backrefMatcher(gData, parenIndex, chars, end);
}
break;
case REOP_CLASS:
{
int index = getIndex(program, pc);
pc += INDEX_LEN;
if (gData.cp != end) {
if (classMatcher(gData, gData.regexp.classList[index],
chars[gData.cp]))
{
gData.cp++;
result = true;
break;
}
}
result = false;
}
break;
case REOP_ASSERT:
case REOP_ASSERT_NOT:
{
byte testOp;
pushProgState(gData, 0, 0, gData.backTrackStackTop,
currentContinuation_pc,
currentContinuation_op);
if (op == REOP_ASSERT) {
testOp = REOP_ASSERTTEST;
} else {
testOp = REOP_ASSERTNOTTEST;
}
pushBackTrackState(gData, testOp,
pc + getOffset(program, pc));
pc += INDEX_LEN;
op = program[pc++];
}
continue;
case REOP_ASSERTTEST:
case REOP_ASSERTNOTTEST:
{
REProgState state = popProgState(gData);
gData.cp = state.index;
gData.backTrackStackTop = state.backTrack;
currentContinuation_pc = state.continuation_pc;
currentContinuation_op = state.continuation_op;
if (result) {
if (op == REOP_ASSERTTEST) {
result = true;
} else {
result = false;
}
} else {
if (op == REOP_ASSERTTEST) {
// Do nothing
} else {
result = true;
}
}
}
break;
case REOP_STAR:
case REOP_PLUS:
case REOP_OPT:
case REOP_QUANT:
case REOP_MINIMALSTAR:
case REOP_MINIMALPLUS:
case REOP_MINIMALOPT:
case REOP_MINIMALQUANT:
{
int min, max;
boolean greedy = false;
switch (op) {
case REOP_STAR:
greedy = true;
// fallthrough
case REOP_MINIMALSTAR:
min = 0;
max = -1;
break;
case REOP_PLUS:
greedy = true;
// fallthrough
case REOP_MINIMALPLUS:
min = 1;
max = -1;
break;
case REOP_OPT:
greedy = true;
// fallthrough
case REOP_MINIMALOPT:
min = 0;
max = 1;
break;
case REOP_QUANT:
greedy = true;
// fallthrough
case REOP_MINIMALQUANT:
min = getOffset(program, pc);
pc += INDEX_LEN;
// See comments in emitREBytecode for " - 1" reason
max = getOffset(program, pc) - 1;
pc += INDEX_LEN;
break;
default:
throw Kit.codeBug();
}
pushProgState(gData, min, max, null,
currentContinuation_pc,
currentContinuation_op);
if (greedy) {
currentContinuation_op = REOP_REPEAT;
currentContinuation_pc = pc;
pushBackTrackState(gData, REOP_REPEAT, pc);
/* Step over <parencount>, <parenindex> & <next> */
pc += 3 * INDEX_LEN;
op = program[pc++];
} else {
if (min != 0) {
currentContinuation_op = REOP_MINIMALREPEAT;
currentContinuation_pc = pc;
/* <parencount> <parenindex> & <next> */
pc += 3 * INDEX_LEN;
op = program[pc++];
} else {
pushBackTrackState(gData, REOP_MINIMALREPEAT, pc);
popProgState(gData);
pc += 2 * INDEX_LEN; // <parencount> & <parenindex>
pc = pc + getOffset(program, pc);
op = program[pc++];
}
}
}
continue;
case REOP_ENDCHILD:
// Use the current continuation.
pc = currentContinuation_pc;
op = currentContinuation_op;
continue;
case REOP_REPEAT:
{
REProgState state = popProgState(gData);
if (!result) {
//
// There's been a failure, see if we have enough
// children.
//
if (state.min == 0)
result = true;
currentContinuation_pc = state.continuation_pc;
currentContinuation_op = state.continuation_op;
pc += 2 * INDEX_LEN; /* <parencount> & <parenindex> */
pc = pc + getOffset(program, pc);
break;
}
else {
if (state.min == 0 && gData.cp == state.index) {
// matched an empty string, that'll get us nowhere
result = false;
currentContinuation_pc = state.continuation_pc;
currentContinuation_op = state.continuation_op;
pc += 2 * INDEX_LEN;
pc = pc + getOffset(program, pc);
break;
}
int new_min = state.min, new_max = state.max;
if (new_min != 0) new_min--;
if (new_max != -1) new_max--;
if (new_max == 0) {
result = true;
currentContinuation_pc = state.continuation_pc;
currentContinuation_op = state.continuation_op;
pc += 2 * INDEX_LEN;
pc = pc + getOffset(program, pc);
break;
}
pushProgState(gData, new_min, new_max, null,
state.continuation_pc,
state.continuation_op);
currentContinuation_op = REOP_REPEAT;
currentContinuation_pc = pc;
pushBackTrackState(gData, REOP_REPEAT, pc);
int parenCount = getIndex(program, pc);
pc += INDEX_LEN;
int parenIndex = getIndex(program, pc);
pc += 2 * INDEX_LEN;
op = program[pc++];
for (int k = 0; k < parenCount; k++) {
gData.set_parens(parenIndex + k, -1, 0);
}
}
}
continue;
case REOP_MINIMALREPEAT:
{
REProgState state = popProgState(gData);
if (!result) {
//
// Non-greedy failure - try to consume another child.
//
if (state.max == -1 || state.max > 0) {
pushProgState(gData, state.min, state.max, null,
state.continuation_pc,
state.continuation_op);
currentContinuation_op = REOP_MINIMALREPEAT;
currentContinuation_pc = pc;
int parenCount = getIndex(program, pc);
pc += INDEX_LEN;
int parenIndex = getIndex(program, pc);
pc += 2 * INDEX_LEN;
for (int k = 0; k < parenCount; k++) {
gData.set_parens(parenIndex + k, -1, 0);
}
op = program[pc++];
continue;
} else {
// Don't need to adjust pc since we're going to pop.
currentContinuation_pc = state.continuation_pc;
currentContinuation_op = state.continuation_op;
break;
}
} else {
if (state.min == 0 && gData.cp == state.index) {
// Matched an empty string, that'll get us nowhere.
result = false;
currentContinuation_pc = state.continuation_pc;
currentContinuation_op = state.continuation_op;
break;
}
int new_min = state.min, new_max = state.max;
if (new_min != 0) new_min--;
if (new_max != -1) new_max--;
pushProgState(gData, new_min, new_max, null,
state.continuation_pc,
state.continuation_op);
if (new_min != 0) {
currentContinuation_op = REOP_MINIMALREPEAT;
currentContinuation_pc = pc;
int parenCount = getIndex(program, pc);
pc += INDEX_LEN;
int parenIndex = getIndex(program, pc);
pc += 2 * INDEX_LEN;
for (int k = 0; k < parenCount; k++) {
gData.set_parens(parenIndex + k, -1, 0);
}
op = program[pc++];
} else {
currentContinuation_pc = state.continuation_pc;
currentContinuation_op = state.continuation_op;
pushBackTrackState(gData, REOP_MINIMALREPEAT, pc);
popProgState(gData);
pc += 2 * INDEX_LEN;
pc = pc + getOffset(program, pc);
op = program[pc++];
}
continue;
}
}
case REOP_END:
return true;
default:
throw Kit.codeBug();
}
/*
* If the match failed and there's a backtrack option, take it.
* Otherwise this is a complete and utter failure.
*/
if (!result) {
REBackTrackData backTrackData = gData.backTrackStackTop;
if (backTrackData != null) {
gData.backTrackStackTop = backTrackData.previous;
gData.lastParen = backTrackData.lastParen;
// XXX: If backTrackData will no longer be used, then
// there is no need to clone backTrackData.parens
if (backTrackData.parens != null) {
gData.parens = backTrackData.parens.clone();
}
gData.cp = backTrackData.cp;
gData.stateStackTop = backTrackData.stateStackTop;
currentContinuation_op
= gData.stateStackTop.continuation_op;
currentContinuation_pc
= gData.stateStackTop.continuation_pc;
pc = backTrackData.continuation_pc;
op = backTrackData.continuation_op;
continue;
}
else
return false;
}
op = program[pc++];
}
}
private static boolean
matchRegExp(REGlobalData gData, RECompiled re,
char[] chars, int start, int end, boolean multiline)
{
if (re.parenCount != 0) {
gData.parens = new long[re.parenCount];
} else {
gData.parens = null;
}
gData.backTrackStackTop = null;
gData.stateStackTop = null;
gData.multiline = multiline;
gData.regexp = re;
gData.lastParen = 0;
int anchorCh = gData.regexp.anchorCh;
//
// have to include the position beyond the last character
// in order to detect end-of-input/line condition
//
for (int i = start; i <= end; ++i) {
//
// If the first node is a literal match, step the index into
// the string until that match is made, or fail if it can't be
// found at all.
//
if (anchorCh >= 0) {
for (;;) {
if (i == end) {
return false;
}
char matchCh = chars[i];
if (matchCh == anchorCh ||
((gData.regexp.flags & JSREG_FOLD) != 0
&& upcase(matchCh) == upcase((char)anchorCh)))
{
break;
}
++i;
}
}
gData.cp = i;
for (int j = 0; j < re.parenCount; j++) {
gData.set_parens(j, -1, 0);
}
boolean result = executeREBytecode(gData, chars, end);
gData.backTrackStackTop = null;
gData.stateStackTop = null;
if (result) {
gData.skipped = i - start;
return true;
}
}
return false;
}
/*
* indexp is assumed to be an array of length 1
*/
Object executeRegExp(Context cx, Scriptable scopeObj, RegExpImpl res,
String str, int indexp[], int matchType)
{
REGlobalData gData = new REGlobalData();
int start = indexp[0];
char[] charArray = str.toCharArray();
int end = charArray.length;
if (start > end)
start = end;
//
// Call the recursive matcher to do the real work.
//
boolean matches = matchRegExp(gData, re, charArray, start, end,
res.multiline);
if (!matches) {
if (matchType != PREFIX) return null;
return Undefined.instance;
}
int index = gData.cp;
int i = index;
indexp[0] = i;
int matchlen = i - (start + gData.skipped);
int ep = index;
index -= matchlen;
Object result;
Scriptable obj;
if (matchType == TEST) {
/*
* Testing for a match and updating cx.regExpImpl: don't allocate
* an array object, do return true.
*/
result = Boolean.TRUE;
obj = null;
}
else {
/*
* The array returned on match has element 0 bound to the matched
* string, elements 1 through re.parenCount bound to the paren
* matches, an index property telling the length of the left context,
* and an input property referring to the input string.
*/
Scriptable scope = getTopLevelScope(scopeObj);
result = ScriptRuntime.newObject(cx, scope, "Array", null);
obj = (Scriptable) result;
String matchstr = new String(charArray, index, matchlen);
obj.put(0, obj, matchstr);
}
if (re.parenCount == 0) {
res.parens = null;
res.lastParen = SubString.emptySubString;
} else {
SubString parsub = null;
int num;
res.parens = new SubString[re.parenCount];
for (num = 0; num < re.parenCount; num++) {
int cap_index = gData.parens_index(num);
String parstr;
if (cap_index != -1) {
int cap_length = gData.parens_length(num);
parsub = new SubString(charArray, cap_index, cap_length);
res.parens[num] = parsub;
if (matchType == TEST) continue;
parstr = parsub.toString();
obj.put(num+1, obj, parstr);
}
else {
if (matchType != TEST)
obj.put(num+1, obj, Undefined.instance);
}
}
res.lastParen = parsub;
}
if (! (matchType == TEST)) {
/*
* Define the index and input properties last for better for/in loop
* order (so they come after the elements).
*/
obj.put("index", obj, new Integer(start + gData.skipped));
obj.put("input", obj, str);
}
if (res.lastMatch == null) {
res.lastMatch = new SubString();
res.leftContext = new SubString();
res.rightContext = new SubString();
}
res.lastMatch.charArray = charArray;
res.lastMatch.index = index;
res.lastMatch.length = matchlen;
res.leftContext.charArray = charArray;
if (cx.getLanguageVersion() == Context.VERSION_1_2) {
/*
* JS1.2 emulated Perl4.0.1.8 (patch level 36) for global regexps used
* in scalar contexts, and unintentionally for the string.match "list"
* psuedo-context. On "hi there bye", the following would result:
*
* Language while(/ /g){print("$`");} s/ /$`/g
* perl4.036 "hi", "there" "hihitherehi therebye"
* perl5 "hi", "hi there" "hihitherehi therebye"
* js1.2 "hi", "there" "hihitheretherebye"
*
* Insofar as JS1.2 always defined $` as "left context from the last
* match" for global regexps, it was more consistent than perl4.
*/
res.leftContext.index = start;
res.leftContext.length = gData.skipped;
} else {
/*
* For JS1.3 and ECMAv2, emulate Perl5 exactly:
*
* js1.3 "hi", "hi there" "hihitherehi therebye"
*/
res.leftContext.index = 0;
res.leftContext.length = start + gData.skipped;
}
res.rightContext.charArray = charArray;
res.rightContext.index = ep;
res.rightContext.length = end - ep;
return result;
}
int getFlags()
{
return re.flags;
}
private static void reportWarning(Context cx, String messageId, String arg)
{
if (cx.hasFeature(Context.FEATURE_STRICT_MODE)) {
String msg = ScriptRuntime.getMessage1(messageId, arg);
Context.reportWarning(msg);
}
}
private static void reportError(String messageId, String arg)
{
String msg = ScriptRuntime.getMessage1(messageId, arg);
throw ScriptRuntime.constructError("SyntaxError", msg);
}
// #string_id_map#
private static final int
Id_lastIndex = 1,
Id_source = 2,
Id_global = 3,
Id_ignoreCase = 4,
Id_multiline = 5,
MAX_INSTANCE_ID = 5;
@Override
protected int getMaxInstanceId()
{
return MAX_INSTANCE_ID;
}
@Override
protected int findInstanceIdInfo(String s)
{
int id;
// #generated# Last update: 2007-05-09 08:16:24 EDT
L0: { id = 0; String X = null; int c;
int s_length = s.length();
if (s_length==6) {
c=s.charAt(0);
if (c=='g') { X="global";id=Id_global; }
else if (c=='s') { X="source";id=Id_source; }
}
else if (s_length==9) {
c=s.charAt(0);
if (c=='l') { X="lastIndex";id=Id_lastIndex; }
else if (c=='m') { X="multiline";id=Id_multiline; }
}
else if (s_length==10) { X="ignoreCase";id=Id_ignoreCase; }
if (X!=null && X!=s && !X.equals(s)) id = 0;
break L0;
}
// #/generated#
// #/string_id_map#
if (id == 0) return super.findInstanceIdInfo(s);
int attr;
switch (id) {
case Id_lastIndex:
attr = PERMANENT | DONTENUM;
break;
case Id_source:
case Id_global:
case Id_ignoreCase:
case Id_multiline:
attr = PERMANENT | READONLY | DONTENUM;
break;
default:
throw new IllegalStateException();
}
return instanceIdInfo(attr, id);
}
@Override
protected String getInstanceIdName(int id)
{
switch (id) {
case Id_lastIndex: return "lastIndex";
case Id_source: return "source";
case Id_global: return "global";
case Id_ignoreCase: return "ignoreCase";
case Id_multiline: return "multiline";
}
return super.getInstanceIdName(id);
}
@Override
protected Object getInstanceIdValue(int id)
{
switch (id) {
case Id_lastIndex:
return ScriptRuntime.wrapNumber(lastIndex);
case Id_source:
return new String(re.source);
case Id_global:
return ScriptRuntime.wrapBoolean((re.flags & JSREG_GLOB) != 0);
case Id_ignoreCase:
return ScriptRuntime.wrapBoolean((re.flags & JSREG_FOLD) != 0);
case Id_multiline:
return ScriptRuntime.wrapBoolean((re.flags & JSREG_MULTILINE) != 0);
}
return super.getInstanceIdValue(id);
}
@Override
protected void setInstanceIdValue(int id, Object value)
{
if (id == Id_lastIndex) {
lastIndex = ScriptRuntime.toNumber(value);
return;
}
super.setInstanceIdValue(id, value);
}
@Override
protected void initPrototypeId(int id)
{
String s;
int arity;
switch (id) {
case Id_compile: arity=1; s="compile"; break;
case Id_toString: arity=0; s="toString"; break;
case Id_toSource: arity=0; s="toSource"; break;
case Id_exec: arity=1; s="exec"; break;
case Id_test: arity=1; s="test"; break;
case Id_prefix: arity=1; s="prefix"; break;
default: throw new IllegalArgumentException(String.valueOf(id));
}
initPrototypeMethod(REGEXP_TAG, id, s, arity);
}
@Override
public Object execIdCall(IdFunctionObject f, Context cx, Scriptable scope,
Scriptable thisObj, Object[] args)
{
if (!f.hasTag(REGEXP_TAG)) {
return super.execIdCall(f, cx, scope, thisObj, args);
}
int id = f.methodId();
switch (id) {
case Id_compile:
return realThis(thisObj, f).compile(cx, scope, args);
case Id_toString:
case Id_toSource:
return realThis(thisObj, f).toString();
case Id_exec:
return realThis(thisObj, f).execSub(cx, scope, args, MATCH);
case Id_test: {
Object x = realThis(thisObj, f).execSub(cx, scope, args, TEST);
return Boolean.TRUE.equals(x) ? Boolean.TRUE : Boolean.FALSE;
}
case Id_prefix:
return realThis(thisObj, f).execSub(cx, scope, args, PREFIX);
}
throw new IllegalArgumentException(String.valueOf(id));
}
private static NativeRegExp realThis(Scriptable thisObj, IdFunctionObject f)
{
if (!(thisObj instanceof NativeRegExp))
throw incompatibleCallError(f);
return (NativeRegExp)thisObj;
}
// #string_id_map#
@Override
protected int findPrototypeId(String s)
{
int id;
// #generated# Last update: 2007-05-09 08:16:24 EDT
L0: { id = 0; String X = null; int c;
L: switch (s.length()) {
case 4: c=s.charAt(0);
if (c=='e') { X="exec";id=Id_exec; }
else if (c=='t') { X="test";id=Id_test; }
break L;
case 6: X="prefix";id=Id_prefix; break L;
case 7: X="compile";id=Id_compile; break L;
case 8: c=s.charAt(3);
if (c=='o') { X="toSource";id=Id_toSource; }
else if (c=='t') { X="toString";id=Id_toString; }
break L;
}
if (X!=null && X!=s && !X.equals(s)) id = 0;
break L0;
}
// #/generated#
return id;
}
private static final int
Id_compile = 1,
Id_toString = 2,
Id_toSource = 3,
Id_exec = 4,
Id_test = 5,
Id_prefix = 6,
MAX_PROTOTYPE_ID = 6;
// #/string_id_map#
private RECompiled re;
double lastIndex; /* index after last match, for //g iterator */
} // class NativeRegExp
class RECompiled implements Serializable
{
static final long serialVersionUID = -6144956577595844213L;
char []source; /* locked source string, sans // */
int parenCount; /* number of parenthesized submatches */
int flags; /* flags */
byte[] program; /* regular expression bytecode */
int classCount; /* count [...] bitmaps */
RECharSet[] classList; /* list of [...] bitmaps */
int anchorCh = -1; /* if >= 0, then re starts with this literal char */
}
class RENode {
RENode(byte op)
{
this.op = op;
}
byte op; /* r.e. op bytecode */
RENode next; /* next in concatenation order */
RENode kid; /* first operand */
RENode kid2; /* second operand */
int num; /* could be a number */
int parenIndex; /* or a parenthesis index */
/* or a range */
int min;
int max;
int parenCount;
boolean greedy;
/* or a character class */
int startIndex;
int kidlen; /* length of string at kid, in chars */
int bmsize; /* bitmap size, based on max char code */
int index; /* index into class list */
/* or a literal sequence */
char chr; /* of one character */
int length; /* or many (via the index) */
int flatIndex; /* which is -1 if not sourced */
}
class CompilerState {
CompilerState(Context cx, char[] source, int length, int flags)
{
this.cx = cx;
this.cpbegin = source;
this.cp = 0;
this.cpend = length;
this.flags = flags;
this.parenCount = 0;
this.classCount = 0;
this.progLength = 0;
}
Context cx;
char cpbegin[];
int cpend;
int cp;
int flags;
int parenCount;
int parenNesting;
int classCount; /* number of [] encountered */
int progLength; /* estimated bytecode length */
RENode result;
}
class REProgState
{
REProgState(REProgState previous, int min, int max, int index,
REBackTrackData backTrack,
int continuation_pc, int continuation_op)
{
this.previous = previous;
this.min = min;
this.max = max;
this.index = index;
this.continuation_op = continuation_op;
this.continuation_pc = continuation_pc;
this.backTrack = backTrack;
}
REProgState previous; // previous state in stack
int min; /* current quantifier min */
int max; /* current quantifier max */
int index; /* progress in text */
int continuation_op;
int continuation_pc;
REBackTrackData backTrack; // used by ASSERT_ to recover state
}
class REBackTrackData {
REBackTrackData(REGlobalData gData, int op, int pc)
{
previous = gData.backTrackStackTop;
continuation_op = op;
continuation_pc = pc;
lastParen = gData.lastParen;
if (gData.parens != null) {
parens = gData.parens.clone();
}
cp = gData.cp;
stateStackTop = gData.stateStackTop;
}
REBackTrackData previous;
int continuation_op; /* where to backtrack to */
int continuation_pc;
int lastParen;
long[] parens; /* parenthesis captures */
int cp; /* char buffer index */
REProgState stateStackTop; /* state of op that backtracked */
}
class REGlobalData {
boolean multiline;
RECompiled regexp; /* the RE in execution */
int lastParen; /* highest paren set so far */
int skipped; /* chars skipped anchoring this r.e. */
int cp; /* char buffer index */
long[] parens; /* parens captures */
REProgState stateStackTop; /* stack of state of current ancestors */
REBackTrackData backTrackStackTop; /* last matched-so-far position */
/**
* Get start of parenthesis capture contents, -1 for empty.
*/
int parens_index(int i)
{
return (int)(parens[i]);
}
/**
* Get length of parenthesis capture contents.
*/
int parens_length(int i)
{
return (int)(parens[i] >>> 32);
}
void set_parens(int i, int index, int length)
{
parens[i] = (index & 0xffffffffL) | ((long)length << 32);
}
}
/*
* This struct holds a bitmap representation of a class from a regexp.
* There's a list of these referenced by the classList field in the NativeRegExp
* struct below. The initial state has startIndex set to the offset in the
* original regexp source of the beginning of the class contents. The first
* use of the class converts the source representation into a bitmap.
*
*/
final class RECharSet implements Serializable
{
static final long serialVersionUID = 7931787979395898394L;
RECharSet(int length, int startIndex, int strlength)
{
this.length = length;
this.startIndex = startIndex;
this.strlength = strlength;
}
int length;
int startIndex;
int strlength;
volatile transient boolean converted;
volatile transient boolean sense;
volatile transient byte[] bits;
}
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