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Rhino is an open-source implementation of JavaScript written entirely in Java. It is typically embedded into Java applications to provide scripting to end users.
/* -*- 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, 1999.
*
* 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):
* Tom Beauvais
* Norris Boyd
* Mike McCabe
*
* 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;
/**
* This class implements the String native object.
*
* See ECMA 15.5.
*
* String methods for dealing with regular expressions are
* ported directly from C. Latest port is from version 1.40.12.19
* in the JSFUN13_BRANCH.
*
* @author Mike McCabe
* @author Norris Boyd
*/
final class NativeString extends IdScriptableObject
{
static final long serialVersionUID = 920268368584188687L;
private static final Object STRING_TAG = new Object();
static void init(Scriptable scope, boolean sealed)
{
NativeString obj = new NativeString("");
obj.exportAsJSClass(MAX_PROTOTYPE_ID, scope, sealed);
}
private NativeString(String s) {
string = s;
}
public String getClassName() {
return "String";
}
private static final int
Id_length = 1,
MAX_INSTANCE_ID = 1;
protected int getMaxInstanceId()
{
return MAX_INSTANCE_ID;
}
protected int findInstanceIdInfo(String s)
{
if (s.equals("length")) {
return instanceIdInfo(DONTENUM | READONLY | PERMANENT, Id_length);
}
return super.findInstanceIdInfo(s);
}
protected String getInstanceIdName(int id)
{
if (id == Id_length) { return "length"; }
return super.getInstanceIdName(id);
}
protected Object getInstanceIdValue(int id)
{
if (id == Id_length) {
return ScriptRuntime.wrapInt(string.length());
}
return super.getInstanceIdValue(id);
}
protected void fillConstructorProperties(IdFunctionObject ctor)
{
addIdFunctionProperty(ctor, STRING_TAG, ConstructorId_fromCharCode,
"fromCharCode", 1);
super.fillConstructorProperties(ctor);
}
protected void initPrototypeId(int id)
{
String s;
int arity;
switch (id) {
case Id_constructor: arity=1; s="constructor"; break;
case Id_toString: arity=0; s="toString"; break;
case Id_toSource: arity=0; s="toSource"; break;
case Id_valueOf: arity=0; s="valueOf"; break;
case Id_charAt: arity=1; s="charAt"; break;
case Id_charCodeAt: arity=1; s="charCodeAt"; break;
case Id_indexOf: arity=1; s="indexOf"; break;
case Id_lastIndexOf: arity=1; s="lastIndexOf"; break;
case Id_split: arity=2; s="split"; break;
case Id_substring: arity=2; s="substring"; break;
case Id_toLowerCase: arity=0; s="toLowerCase"; break;
case Id_toUpperCase: arity=0; s="toUpperCase"; break;
case Id_substr: arity=2; s="substr"; break;
case Id_concat: arity=1; s="concat"; break;
case Id_slice: arity=2; s="slice"; break;
case Id_bold: arity=0; s="bold"; break;
case Id_italics: arity=0; s="italics"; break;
case Id_fixed: arity=0; s="fixed"; break;
case Id_strike: arity=0; s="strike"; break;
case Id_small: arity=0; s="small"; break;
case Id_big: arity=0; s="big"; break;
case Id_blink: arity=0; s="blink"; break;
case Id_sup: arity=0; s="sup"; break;
case Id_sub: arity=0; s="sub"; break;
case Id_fontsize: arity=0; s="fontsize"; break;
case Id_fontcolor: arity=0; s="fontcolor"; break;
case Id_link: arity=0; s="link"; break;
case Id_anchor: arity=0; s="anchor"; break;
case Id_equals: arity=1; s="equals"; break;
case Id_equalsIgnoreCase: arity=1; s="equalsIgnoreCase"; break;
case Id_match: arity=1; s="match"; break;
case Id_search: arity=1; s="search"; break;
case Id_replace: arity=1; s="replace"; break;
default: throw new IllegalArgumentException(String.valueOf(id));
}
initPrototypeMethod(STRING_TAG, id, s, arity);
}
public Object execIdCall(IdFunctionObject f, Context cx, Scriptable scope,
Scriptable thisObj, Object[] args)
{
if (!f.hasTag(STRING_TAG)) {
return super.execIdCall(f, cx, scope, thisObj, args);
}
int id = f.methodId();
switch (id) {
case ConstructorId_fromCharCode: {
int N = args.length;
if (N < 1)
return "";
StringBuffer sb = new StringBuffer(N);
for (int i = 0; i != N; ++i) {
sb.append(ScriptRuntime.toUint16(args[i]));
}
return sb.toString();
}
case Id_constructor: {
String s = (args.length >= 1)
? ScriptRuntime.toString(args[0]) : "";
if (thisObj == null) {
// new String(val) creates a new String object.
return new NativeString(s);
}
// String(val) converts val to a string value.
return s;
}
case Id_toString:
case Id_valueOf:
// ECMA 15.5.4.2: 'the toString function is not generic.
return realThis(thisObj, f).string;
case Id_toSource: {
String s = realThis(thisObj, f).string;
return "(new String(\""+ScriptRuntime.escapeString(s)+"\"))";
}
case Id_charAt:
case Id_charCodeAt: {
// See ECMA 15.5.4.[4,5]
String target = ScriptRuntime.toString(thisObj);
double pos = ScriptRuntime.toInteger(args, 0);
if (pos < 0 || pos >= target.length()) {
if (id == Id_charAt) return "";
else return ScriptRuntime.NaNobj;
}
char c = target.charAt((int)pos);
if (id == Id_charAt) return String.valueOf(c);
else return ScriptRuntime.wrapInt(c);
}
case Id_indexOf:
return ScriptRuntime.wrapInt(js_indexOf(
ScriptRuntime.toString(thisObj), args));
case Id_lastIndexOf:
return ScriptRuntime.wrapInt(js_lastIndexOf(
ScriptRuntime.toString(thisObj), args));
case Id_split:
return js_split(cx, scope, ScriptRuntime.toString(thisObj), args);
case Id_substring:
return js_substring(cx, ScriptRuntime.toString(thisObj), args);
case Id_toLowerCase:
// See ECMA 15.5.4.11
return ScriptRuntime.toString(thisObj).toLowerCase();
case Id_toUpperCase:
// See ECMA 15.5.4.12
return ScriptRuntime.toString(thisObj).toUpperCase();
case Id_substr:
return js_substr(ScriptRuntime.toString(thisObj), args);
case Id_concat:
return js_concat(ScriptRuntime.toString(thisObj), args);
case Id_slice:
return js_slice(ScriptRuntime.toString(thisObj), args);
case Id_bold:
return tagify(thisObj, "b", null, null);
case Id_italics:
return tagify(thisObj, "i", null, null);
case Id_fixed:
return tagify(thisObj, "tt", null, null);
case Id_strike:
return tagify(thisObj, "strike", null, null);
case Id_small:
return tagify(thisObj, "small", null, null);
case Id_big:
return tagify(thisObj, "big", null, null);
case Id_blink:
return tagify(thisObj, "blink", null, null);
case Id_sup:
return tagify(thisObj, "sup", null, null);
case Id_sub:
return tagify(thisObj, "sub", null, null);
case Id_fontsize:
return tagify(thisObj, "font", "size", args);
case Id_fontcolor:
return tagify(thisObj, "font", "color", args);
case Id_link:
return tagify(thisObj, "a", "href", args);
case Id_anchor:
return tagify(thisObj, "a", "name", args);
case Id_equals:
case Id_equalsIgnoreCase: {
String s1 = ScriptRuntime.toString(thisObj);
String s2 = ScriptRuntime.toString(args, 0);
return ScriptRuntime.wrapBoolean(
(id == Id_equals) ? s1.equals(s2) : s1.equalsIgnoreCase(s2));
}
case Id_match:
case Id_search:
case Id_replace:
{
int actionType;
if (id == Id_match) {
actionType = RegExpProxy.RA_MATCH;
} else if (id == Id_search) {
actionType = RegExpProxy.RA_SEARCH;
} else {
actionType = RegExpProxy.RA_REPLACE;
}
return ScriptRuntime.checkRegExpProxy(cx).
action(cx, scope, thisObj, args, actionType);
}
}
throw new IllegalArgumentException(String.valueOf(id));
}
private static NativeString realThis(Scriptable thisObj, IdFunctionObject f)
{
if (!(thisObj instanceof NativeString))
throw incompatibleCallError(f);
return (NativeString)thisObj;
}
/*
* HTML composition aids.
*/
private static String tagify(Object thisObj, String tag,
String attribute, Object[] args)
{
String str = ScriptRuntime.toString(thisObj);
StringBuffer result = new StringBuffer();
result.append('<');
result.append(tag);
if (attribute != null) {
result.append(' ');
result.append(attribute);
result.append("=\"");
result.append(ScriptRuntime.toString(args, 0));
result.append('"');
}
result.append('>');
result.append(str);
result.append("');
return result.toString();
}
public String toString() {
return string;
}
/* Make array-style property lookup work for strings.
* XXX is this ECMA? A version check is probably needed. In js too.
*/
public Object get(int index, Scriptable start) {
if (0 <= index && index < string.length()) {
return string.substring(index, index + 1);
}
return super.get(index, start);
}
public void put(int index, Scriptable start, Object value) {
if (0 <= index && index < string.length()) {
return;
}
super.put(index, start, value);
}
/*
*
* See ECMA 15.5.4.6. Uses Java String.indexOf()
* OPT to add - BMH searching from jsstr.c.
*/
private static int js_indexOf(String target, Object[] args) {
String search = ScriptRuntime.toString(args, 0);
double begin = ScriptRuntime.toInteger(args, 1);
if (begin > target.length()) {
return -1;
} else {
if (begin < 0)
begin = 0;
return target.indexOf(search, (int)begin);
}
}
/*
*
* See ECMA 15.5.4.7
*
*/
private static int js_lastIndexOf(String target, Object[] args) {
String search = ScriptRuntime.toString(args, 0);
double end = ScriptRuntime.toNumber(args, 1);
if (end != end || end > target.length())
end = target.length();
else if (end < 0)
end = 0;
return target.lastIndexOf(search, (int)end);
}
/*
* Used by js_split to find the next split point in target,
* starting at offset ip and looking either for the given
* separator substring, or for the next re match. ip and
* matchlen must be reference variables (assumed to be arrays of
* length 1) so they can be updated in the leading whitespace or
* re case.
*
* Return -1 on end of string, >= 0 for a valid index of the next
* separator occurrence if found, or the string length if no
* separator is found.
*/
private static int find_split(Context cx, Scriptable scope, String target,
String separator, int version,
RegExpProxy reProxy, Scriptable re,
int[] ip, int[] matchlen, boolean[] matched,
String[][] parensp)
{
int i = ip[0];
int length = target.length();
/*
* Perl4 special case for str.split(' '), only if the user has selected
* JavaScript1.2 explicitly. Split on whitespace, and skip leading w/s.
* Strange but true, apparently modeled after awk.
*/
if (version == Context.VERSION_1_2 &&
re == null && separator.length() == 1 && separator.charAt(0) == ' ')
{
/* Skip leading whitespace if at front of str. */
if (i == 0) {
while (i < length && Character.isWhitespace(target.charAt(i)))
i++;
ip[0] = i;
}
/* Don't delimit whitespace at end of string. */
if (i == length)
return -1;
/* Skip over the non-whitespace chars. */
while (i < length
&& !Character.isWhitespace(target.charAt(i)))
i++;
/* Now skip the next run of whitespace. */
int j = i;
while (j < length && Character.isWhitespace(target.charAt(j)))
j++;
/* Update matchlen to count delimiter chars. */
matchlen[0] = j - i;
return i;
}
/*
* Stop if past end of string. If at end of string, we will
* return target length, so that
*
* "ab,".split(',') => new Array("ab", "")
*
* and the resulting array converts back to the string "ab,"
* for symmetry. NB: This differs from perl, which drops the
* trailing empty substring if the LIMIT argument is omitted.
*/
if (i > length)
return -1;
/*
* Match a regular expression against the separator at or
* above index i. Return -1 at end of string instead of
* trying for a match, so we don't get stuck in a loop.
*/
if (re != null) {
return reProxy.find_split(cx, scope, target, separator, re,
ip, matchlen, matched, parensp);
}
/*
* Deviate from ECMA by never splitting an empty string by any separator
* string into a non-empty array (an array of length 1 that contains the
* empty string).
*/
if (version != Context.VERSION_DEFAULT && version < Context.VERSION_1_3
&& length == 0)
return -1;
/*
* Special case: if sep is the empty string, split str into
* one character substrings. Let our caller worry about
* whether to split once at end of string into an empty
* substring.
*
* For 1.2 compatibility, at the end of the string, we return the length as
* the result, and set the separator length to 1 -- this allows the caller
* to include an additional null string at the end of the substring list.
*/
if (separator.length() == 0) {
if (version == Context.VERSION_1_2) {
if (i == length) {
matchlen[0] = 1;
return i;
}
return i + 1;
}
return (i == length) ? -1 : i + 1;
}
/* Punt to j.l.s.indexOf; return target length if separator is
* not found.
*/
if (ip[0] >= length)
return length;
i = target.indexOf(separator, ip[0]);
return (i != -1) ? i : length;
}
/*
* See ECMA 15.5.4.8. Modified to match JS 1.2 - optionally takes
* a limit argument and accepts a regular expression as the split
* argument.
*/
private static Object js_split(Context cx, Scriptable scope,
String target, Object[] args)
{
// create an empty Array to return;
Scriptable top = getTopLevelScope(scope);
Scriptable result = ScriptRuntime.newObject(cx, top, "Array", null);
// return an array consisting of the target if no separator given
// don't check against undefined, because we want
// 'fooundefinedbar'.split(void 0) to split to ['foo', 'bar']
if (args.length < 1) {
result.put(0, result, target);
return result;
}
// Use the second argument as the split limit, if given.
boolean limited = (args.length > 1) && (args[1] != Undefined.instance);
long limit = 0; // Initialize to avoid warning.
if (limited) {
/* Clamp limit between 0 and 1 + string length. */
limit = ScriptRuntime.toUint32(args[1]);
if (limit > target.length())
limit = 1 + target.length();
}
String separator = null;
int[] matchlen = new int[1];
Scriptable re = null;
RegExpProxy reProxy = null;
if (args[0] instanceof Scriptable) {
reProxy = ScriptRuntime.getRegExpProxy(cx);
if (reProxy != null) {
Scriptable test = (Scriptable)args[0];
if (reProxy.isRegExp(test)) {
re = test;
}
}
}
if (re == null) {
separator = ScriptRuntime.toString(args[0]);
matchlen[0] = separator.length();
}
// split target with separator or re
int[] ip = { 0 };
int match;
int len = 0;
boolean[] matched = { false };
String[][] parens = { null };
int version = cx.getLanguageVersion();
while ((match = find_split(cx, scope, target, separator, version,
reProxy, re, ip, matchlen, matched, parens))
>= 0)
{
if ((limited && len >= limit) || (match > target.length()))
break;
String substr;
if (target.length() == 0)
substr = target;
else
substr = target.substring(ip[0], match);
result.put(len, result, substr);
len++;
/*
* Imitate perl's feature of including parenthesized substrings
* that matched part of the delimiter in the new array, after the
* split substring that was delimited.
*/
if (re != null && matched[0] == true) {
int size = parens[0].length;
for (int num = 0; num < size; num++) {
if (limited && len >= limit)
break;
result.put(len, result, parens[0][num]);
len++;
}
matched[0] = false;
}
ip[0] = match + matchlen[0];
if (version < Context.VERSION_1_3
&& version != Context.VERSION_DEFAULT)
{
/*
* Deviate from ECMA to imitate Perl, which omits a final
* split unless a limit argument is given and big enough.
*/
if (!limited && ip[0] == target.length())
break;
}
}
return result;
}
/*
* See ECMA 15.5.4.15
*/
private static String js_substring(Context cx, String target,
Object[] args)
{
int length = target.length();
double start = ScriptRuntime.toInteger(args, 0);
double end;
if (start < 0)
start = 0;
else if (start > length)
start = length;
if (args.length <= 1 || args[1] == Undefined.instance) {
end = length;
} else {
end = ScriptRuntime.toInteger(args[1]);
if (end < 0)
end = 0;
else if (end > length)
end = length;
// swap if end < start
if (end < start) {
if (cx.getLanguageVersion() != Context.VERSION_1_2) {
double temp = start;
start = end;
end = temp;
} else {
// Emulate old JDK1.0 java.lang.String.substring()
end = start;
}
}
}
return target.substring((int)start, (int)end);
}
int getLength() {
return string.length();
}
/*
* Non-ECMA methods.
*/
private static String js_substr(String target, Object[] args) {
if (args.length < 1)
return target;
double begin = ScriptRuntime.toInteger(args[0]);
double end;
int length = target.length();
if (begin < 0) {
begin += length;
if (begin < 0)
begin = 0;
} else if (begin > length) {
begin = length;
}
if (args.length == 1) {
end = length;
} else {
end = ScriptRuntime.toInteger(args[1]);
if (end < 0)
end = 0;
end += begin;
if (end > length)
end = length;
}
return target.substring((int)begin, (int)end);
}
/*
* Python-esque sequence operations.
*/
private static String js_concat(String target, Object[] args) {
int N = args.length;
if (N == 0) { return target; }
else if (N == 1) {
String arg = ScriptRuntime.toString(args[0]);
return target.concat(arg);
}
// Find total capacity for the final string to avoid unnecessary
// re-allocations in StringBuffer
int size = target.length();
String[] argsAsStrings = new String[N];
for (int i = 0; i != N; ++i) {
String s = ScriptRuntime.toString(args[i]);
argsAsStrings[i] = s;
size += s.length();
}
StringBuffer result = new StringBuffer(size);
result.append(target);
for (int i = 0; i != N; ++i) {
result.append(argsAsStrings[i]);
}
return result.toString();
}
private static String js_slice(String target, Object[] args) {
if (args.length != 0) {
double begin = ScriptRuntime.toInteger(args[0]);
double end;
int length = target.length();
if (begin < 0) {
begin += length;
if (begin < 0)
begin = 0;
} else if (begin > length) {
begin = length;
}
if (args.length == 1) {
end = length;
} else {
end = ScriptRuntime.toInteger(args[1]);
if (end < 0) {
end += length;
if (end < 0)
end = 0;
} else if (end > length) {
end = length;
}
if (end < begin)
end = begin;
}
return target.substring((int)begin, (int)end);
}
return target;
}
// #string_id_map#
protected int findPrototypeId(String s)
{
int id;
// #generated# Last update: 2004-03-17 13:44:29 CET
L0: { id = 0; String X = null; int c;
L: switch (s.length()) {
case 3: c=s.charAt(2);
if (c=='b') { if (s.charAt(0)=='s' && s.charAt(1)=='u') {id=Id_sub; break L0;} }
else if (c=='g') { if (s.charAt(0)=='b' && s.charAt(1)=='i') {id=Id_big; break L0;} }
else if (c=='p') { if (s.charAt(0)=='s' && s.charAt(1)=='u') {id=Id_sup; break L0;} }
break L;
case 4: c=s.charAt(0);
if (c=='b') { X="bold";id=Id_bold; }
else if (c=='l') { X="link";id=Id_link; }
break L;
case 5: switch (s.charAt(4)) {
case 'd': X="fixed";id=Id_fixed; break L;
case 'e': X="slice";id=Id_slice; break L;
case 'h': X="match";id=Id_match; break L;
case 'k': X="blink";id=Id_blink; break L;
case 'l': X="small";id=Id_small; break L;
case 't': X="split";id=Id_split; break L;
} break L;
case 6: switch (s.charAt(1)) {
case 'e': X="search";id=Id_search; break L;
case 'h': X="charAt";id=Id_charAt; break L;
case 'n': X="anchor";id=Id_anchor; break L;
case 'o': X="concat";id=Id_concat; break L;
case 'q': X="equals";id=Id_equals; break L;
case 't': X="strike";id=Id_strike; break L;
case 'u': X="substr";id=Id_substr; break L;
} break L;
case 7: switch (s.charAt(1)) {
case 'a': X="valueOf";id=Id_valueOf; break L;
case 'e': X="replace";id=Id_replace; break L;
case 'n': X="indexOf";id=Id_indexOf; break L;
case 't': X="italics";id=Id_italics; break L;
} break L;
case 8: c=s.charAt(4);
if (c=='r') { X="toString";id=Id_toString; }
else if (c=='s') { X="fontsize";id=Id_fontsize; }
else if (c=='u') { X="toSource";id=Id_toSource; }
break L;
case 9: c=s.charAt(0);
if (c=='f') { X="fontcolor";id=Id_fontcolor; }
else if (c=='s') { X="substring";id=Id_substring; }
break L;
case 10: X="charCodeAt";id=Id_charCodeAt; break L;
case 11: switch (s.charAt(2)) {
case 'L': X="toLowerCase";id=Id_toLowerCase; break L;
case 'U': X="toUpperCase";id=Id_toUpperCase; break L;
case 'n': X="constructor";id=Id_constructor; break L;
case 's': X="lastIndexOf";id=Id_lastIndexOf; break L;
} break L;
case 16: X="equalsIgnoreCase";id=Id_equalsIgnoreCase; break L;
}
if (X!=null && X!=s && !X.equals(s)) id = 0;
}
// #/generated#
return id;
}
private static final int
ConstructorId_fromCharCode = -1,
Id_constructor = 1,
Id_toString = 2,
Id_toSource = 3,
Id_valueOf = 4,
Id_charAt = 5,
Id_charCodeAt = 6,
Id_indexOf = 7,
Id_lastIndexOf = 8,
Id_split = 9,
Id_substring = 10,
Id_toLowerCase = 11,
Id_toUpperCase = 12,
Id_substr = 13,
Id_concat = 14,
Id_slice = 15,
Id_bold = 16,
Id_italics = 17,
Id_fixed = 18,
Id_strike = 19,
Id_small = 20,
Id_big = 21,
Id_blink = 22,
Id_sup = 23,
Id_sub = 24,
Id_fontsize = 25,
Id_fontcolor = 26,
Id_link = 27,
Id_anchor = 28,
Id_equals = 29,
Id_equalsIgnoreCase = 30,
Id_match = 31,
Id_search = 32,
Id_replace = 33,
MAX_PROTOTYPE_ID = 33;
// #/string_id_map#
private String string;
}