public String toString() {
StringBuffer sb = new StringBuffer();
sb.append(getClass().getName());
sb.append('@');
sb.append(Integer.toHexString(System.identityHashCode(this)));
sb.append(" (context=");
sb.append(_context);
sb.append(", static_permitions=");
sb.append(_statisPermissions);
sb.append(')');
return sb.toString();
}
// 得到的tokens包含源代码的由词法分析器分析出的所有单词，但不包含注释
private static ArrayList<JavaScriptToken> parse(
Reader in, ErrorReporter reporter) // 返回tokens（保存的是源文件中出现的javascript关键字和NAME，REGEXP，STRING等类型）
throws IOException, EvaluatorException {
CompilerEnvirons env = new CompilerEnvirons(); // 创建编译环境对象
env.setLanguageVersion(Context.VERSION_1_7); // 设置语言版本
Parser parser = new Parser(env, reporter); // 创建解释器对象
parser.parse(in, null, 1); // 解释输入流
String source = parser.getEncodedSource(); // 获得已编码的源码（词法分析阶段通常是把从源程序中识别出的各个单词的词文
// 转换为某种内部表示
int offset = 0;
int length = source.length();
ArrayList<JavaScriptToken> tokens = new ArrayList<JavaScriptToken>();
StringBuffer sb = new StringBuffer();
while (offset < length) {
int tt = source.charAt(offset++); // 获取特定位置上的字符，并转化为ASCII编码
switch (tt) {
case Token.CONDCOMMENT: // 条件注释
case Token.KEEPCOMMENT: // 注释
case Token.NAME: //
case Token.REGEXP: // 正则表达式类型
case Token.STRING: // String类型,js程序中双引号或单引号括起来的字符串
sb.setLength(0);
offset = printSourceString(source, offset, sb);
tokens.add(new JavaScriptToken(tt, sb.toString()));
break;
case Token.NUMBER: // Number类型
sb.setLength(0);
offset = printSourceNumber(source, offset, sb);
tokens.add(new JavaScriptToken(tt, sb.toString()));
break;
default:
String literal = literals.get(new Integer(tt));
if (literal != null) { // 若不为空，说明哈希表literals中含有键new
// Integer(tt)所对应的值
tokens.add(new JavaScriptToken(tt, literal)); // 将此关键字保存到数组列表tokens中
}
break;
}
}
/*
* //begin Iterator<JavaScriptToken> iterator = tokens.iterator();
* JavaScriptToken token; while(iterator.hasNext()) { token =
* iterator.next();
* System.out.println(token.getType()+"\t"+token.getValue()); } //end
*/
return tokens;
}
protected int[] resize(
int thumbWidth,
int thumbHeight,
int imageWidth,
int imageHeight,
String srcPath,
String dstPath,
boolean scaleComputed) {
if (!scaleComputed) {
int[] dims = computeResizedDimensions(thumbWidth, thumbHeight, imageWidth, imageHeight);
thumbWidth = dims[0];
thumbHeight = dims[1];
}
String[] paths = escapePaths(srcPath, dstPath);
srcPath = paths[0];
dstPath = paths[1];
String cmd = core.app.getProperty("imagemagick");
boolean success = false;
if (cmd == null) {
RenderedOp resizedImage =
this.resizeJAI(
thumbWidth,
thumbHeight,
FileLoadDescriptor.create(srcPath, null, null, null),
false); // Don't like the pre-calculated scaling. Recalculate it.
String type = dstPath.substring(dstPath.lastIndexOf(".") + 1);
success = writeImage(dstPath, type, resizedImage);
} else {
if (!cmd.endsWith("convert")) {
if (!cmd.endsWith(File.separator)) {
cmd += File.separator;
}
cmd += "convert";
}
StringBuffer command = new StringBuffer(cmd);
command.append(" -geometry ");
command.append(thumbWidth).append("x").append(thumbHeight);
command.append(" ").append(srcPath);
command.append(" ").append(dstPath);
success = exec(command.toString());
}
if (success) {
return new int[] {thumbWidth, thumbHeight};
}
return null;
}
/** Returns the source URL for the given script or function. */
private String getNormalizedUrl(DebuggableScript fnOrScript) {
String url = fnOrScript.getSourceName();
if (url == null) {
url = "<stdin>";
} else {
// Not to produce window for eval from different lines,
// strip line numbers, i.e. replace all #[0-9]+\(eval\) by
// (eval)
// Option: similar teatment for Function?
char evalSeparator = '#';
StringBuffer sb = null;
int urlLength = url.length();
int cursor = 0;
for (; ; ) {
int searchStart = url.indexOf(evalSeparator, cursor);
if (searchStart < 0) {
break;
}
String replace = null;
int i = searchStart + 1;
while (i != urlLength) {
int c = url.charAt(i);
if (!('0' <= c && c <= '9')) {
break;
}
++i;
}
if (i != searchStart + 1) {
// i points after #[0-9]+
if ("(eval)".regionMatches(0, url, i, 6)) {
cursor = i + 6;
replace = "(eval)";
}
}
if (replace == null) {
break;
}
if (sb == null) {
sb = new StringBuffer();
sb.append(url.substring(0, searchStart));
}
sb.append(replace);
}
if (sb != null) {
if (cursor != urlLength) {
sb.append(url.substring(cursor));
}
url = sb.toString();
}
}
return url;
}
@Override
String toXMLString() {
// See ECMA 10.2.1
StringBuffer sb = new StringBuffer();
for (int i = 0; i < length(); i++) {
if (getProcessor().isPrettyPrinting() && i != 0) {
sb.append('\n');
}
sb.append(getXmlFromAnnotation(i).toXMLString());
}
return sb.toString();
}
protected int[] crop(
int width, int height, int offsetx, int offsety, String srcPath, String dstPath) {
String[] paths = escapePaths(srcPath, dstPath);
srcPath = paths[0];
dstPath = paths[1];
boolean success = false;
String cmd = core.app.getProperty("imagemagick");
if (cmd == null) {
ParameterBlock args = new ParameterBlock();
args.addSource(FileLoadDescriptor.create(srcPath, null, null, null));
args.add((float) offsetx);
args.add((float) offsety);
args.add((float) width);
args.add((float) height);
RenderedOp croppedImage = JAI.create("crop", args);
String type = dstPath.substring(dstPath.lastIndexOf(".") + 1);
success = writeImage(dstPath, type, croppedImage);
} else {
if (!cmd.endsWith("convert")) {
if (!cmd.endsWith(File.separator)) {
cmd += File.separator;
}
cmd += "convert";
}
StringBuffer command = new StringBuffer(cmd);
command.append(" -crop ");
command
.append(width)
.append("x")
.append(height)
.append("+")
.append(offsetx)
.append("+")
.append(offsety)
.append("!");
command.append(" ").append(srcPath);
command.append(" ").append(dstPath);
success = exec(command.toString());
}
if (success) {
return new int[] {width, height};
}
return null;
}
private static int printSourceNumber(String source, int offset, StringBuffer sb) {
double number = 0.0;
char type = source.charAt(offset);
++offset;
if (type == 'S') {
if (sb != null) {
number = source.charAt(offset);
}
++offset;
} else if (type == 'J' || type == 'D') {
if (sb != null) {
long lbits;
lbits = (long) source.charAt(offset) << 48;
lbits |= (long) source.charAt(offset + 1) << 32;
lbits |= (long) source.charAt(offset + 2) << 16;
lbits |= (long) source.charAt(offset + 3);
if (type == 'J') {
number = lbits;
} else {
number = Double.longBitsToDouble(lbits);
}
}
offset += 4;
} else {
// Bad source
throw new RuntimeException();
}
if (sb != null) {
sb.append(ScriptRuntime.numberToString(number, 10));
}
return offset;
}
/**
* Adds another Image object as a thumbnail (child) of this Image object, which can be retrieved
* using <code> getThumbnail(accessname) </code>.
*
* @param {Image} child The Image object to add as a child of this Image object
* @param {String} [accessname] The accessname by which the child Image object may be retrieved by
* calling getThumbnail(accessname). If this argument is left unspecified, defaults to a
* String "[width]x[height]". So if the width is 200 and the height is 100, the default
* accessname will be 200x100
* @returns {Boolean} Whether the operation was a success or not. If there is already an Image
* object with the same name as accessname located as a child of this Image object, then it
* will fail and return <code> false </code>
*/
public boolean jsFunction_addThumbnail(Object child, Object accessname) {
if (child instanceof ImageObject) {
ImageObject th = (ImageObject) child;
StringBuffer sb = new StringBuffer();
if (accessname != null && accessname != Scriptable.NOT_FOUND) {
sb.append((String) accessname);
} else {
sb.append(th.getDimension(WIDTH)).append("x").append(th.getDimension(HEIGHT));
}
th.node.setString(FileObject.ACCESSNAME, sb.toString());
return super.jsFunction_add(th);
}
return false;
}
private String getDebugString(int max) {
assert max > 0;
StringBuffer result = new StringBuffer();
int start = Math.max(offset - max, 0);
int end = Math.min(offset + max, tokens.size());
for (int i = start; i < end; i++) {
JavaScriptToken token = tokens.get(i);
if (i == offset - 1) {
result.append(" ---> ");
}
result.append(token.getValue());
if (i == offset - 1) {
result.append(" <--- ");
}
}
return result.toString();
}
protected String[] escapePaths(String srcPath, String dstPath) {
srcPath = srcPath.trim();
dstPath = dstPath.trim();
String os = System.getProperty("os.name").toLowerCase();
if (os != null && os.indexOf("windows") > -1) {
srcPath = "\"" + srcPath + "\"";
dstPath = "\"" + dstPath + "\"";
} else {
int lastidx = -1, curridx;
StringBuffer buff = new StringBuffer(srcPath);
while ((curridx = buff.indexOf(" ", lastidx)) > 0) {
buff.insert(curridx, "\\");
lastidx = curridx + 2;
}
srcPath = buff.toString();
buff = new StringBuffer(dstPath);
lastidx = -1;
while ((curridx = buff.indexOf(" ", lastidx)) > 0) {
buff.insert(curridx, "\\");
lastidx = curridx + 2;
}
dstPath = buff.toString();
}
return new String[] {srcPath, dstPath};
}
// Add necessary escaping that was removed in Rhino's tokenizer（词法分析器）.
private static String escapeString(String s, char quotechar) {
assert quotechar == '"'
|| quotechar == '\''; // 如果启用了断言，则表达式为假时，程序抛出AssertionError（这是一个错误，不是异常，所以不能被捕获）
if (s == null) {
return null;
}
StringBuffer sb = new StringBuffer();
for (int i = 0, L = s.length(); i < L; i++) {
int c = s.charAt(i);
if (c == quotechar) {
sb.append("\\");
}
sb.append((char) c);
}
return sb.toString();
}
@Override
public String toString() {
// ECMA357 10.1.2
if (hasSimpleContent()) {
StringBuffer sb = new StringBuffer();
for (int i = 0; i < length(); i++) {
XML next = getXmlFromAnnotation(i);
if (next.isComment() || next.isProcessingInstruction()) {
// do nothing
} else {
sb.append(next.toString());
}
}
return sb.toString();
} else {
return toXMLString();
}
}
private static int printSourceString(String source, int offset, StringBuffer sb) {
int length = source.charAt(offset);
++offset;
if ((0x8000 & length) != 0) {
length = ((0x7FFF & length) << 16) | source.charAt(offset);
++offset;
}
if (sb != null) {
String str = source.substring(offset, offset + length);
sb.append(str);
}
return offset + length;
}
public String printMungeMapping() {
StringBuffer sb = new StringBuffer();
globalScope.getFullMapping(sb, "");
return sb.toString();
}
public StringBuffer printSymbolTree(int linebreakpos, boolean preserveAllSemiColons)
throws IOException {
offset = 0;
braceNesting = 0;
scopes.clear();
String symbol;
JavaScriptToken token;
// begin
if (tokens.size() == 0) {
StringBuffer result = new StringBuffer();
return result;
}
// end
JavaScriptToken lastToken = getToken(0);
ScriptOrFnScope currentScope;
JavaScriptIdentifier identifier;
int length = tokens.size(); // 文本的长度
StringBuffer result = new StringBuffer();
int linestartpos = 0;
enterScope(globalScope); // 将globalScope压入栈scopes中
while (offset < length) {
token = consumeToken();
symbol = token.getValue();
currentScope = getCurrentScope();
switch (token.getType()) {
case Token.GET:
case Token.SET:
lastToken = token; // 注意没有break;
case Token.NAME:
if (offset >= 2 && getToken(-2).getType() == Token.DOT
|| getToken(0).getType() == Token.OBJECTLIT) {
result.append(symbol);
} else {
identifier = getIdentifier(symbol, currentScope);
if (identifier != null) {
if (identifier.getMungedValue() != null) {
result.append(identifier.getMungedValue());
} else {
result.append(symbol);
}
if (currentScope != globalScope // 全局域中的变量可能被HTML文档使用，不需要发出警告
&& identifier.getRefcount() == 0) {
warn("标识符" + symbol + "已经声明但未使用 ", true);
}
} else {
result.append(symbol);
}
}
break;
case Token.REGEXP:
case Token.STRING:
result.append(symbol);
break;
case Token.NUMBER:
if (getToken(0).getType() == Token.DOT) {
// calling methods on int requires a leading dot so JS
// doesn't
// treat the method as the decimal component of a float
result.append('(');
result.append(symbol);
result.append(')');
} else {
result.append(symbol);
}
break;
case Token.ADD:
case Token.SUB:
result.append(literals.get(new Integer(token.getType())));
if (offset < length) {
token = getToken(0);
if (token.getType() == Token.INC
|| token.getType() == Token.DEC
|| token.getType() == Token.ADD
|| token.getType() == Token.DEC) {
// Handle the case x +/- ++/-- y
// We must keep a white space here. Otherwise, x +++ y
// would be
// interpreted as x ++ + y by the compiler, which is a
// bug (due
// to the implicit(隐式的) assignment being done on the
// wrong variable)
result.append(' ');
} else if (token.getType() == Token.POS && getToken(-1).getType() == Token.ADD
|| token.getType() == Token.NEG && getToken(-1).getType() == Token.SUB) {
// Handle the case x + + y and x - - y
result.append(' ');
}
}
break;
case Token.FUNCTION:
if (lastToken.getType() != Token.GET && lastToken.getType() != Token.SET) {
result.append("function");
}
lastToken = token;
token = consumeToken();
if (token.getType() == Token.NAME) {
result.append(' ');
symbol = token.getValue();
identifier = getIdentifier(symbol, currentScope);
assert identifier != null;
if (identifier.getMungedValue() != null) {
result.append(identifier.getMungedValue());
} else {
result.append(symbol);
}
if (currentScope != globalScope && identifier.getRefcount() == 0) {
warn("标识符" + symbol + "已经声明但未使用", true);
}
token = consumeToken();
}
assert token.getType() == Token.LP;
result.append('(');
currentScope = indexedScopes.get(new Integer(offset)); // 根据左圆括号的下一个索引映射得到函数作用域
enterScope(currentScope);
while ((token = consumeToken()).getType() != Token.RP) {
assert token.getType() == Token.NAME || token.getType() == Token.COMMA;
if (token.getType() == Token.NAME) {
symbol = token.getValue();
identifier = getIdentifier(symbol, currentScope);
assert identifier != null;
if (identifier.getMungedValue() != null) {
result.append(identifier.getMungedValue());
} else {
result.append(symbol);
}
} else if (token.getType() == Token.COMMA) {
result.append(',');
}
}
result.append(')');
token = consumeToken(); // 得到左花括号
assert token.getType() == Token.LC;
result.append("{"); // nomodify
braceNesting++;
token = getToken(0);
if (token.getType() == Token.STRING && getToken(1).getType() == Token.SEMI) {
// This is a hint. Skip it!
consumeToken();
consumeToken();
}
break;
case Token.RETURN:
case Token.TYPEOF:
result.append(literals.get(new Integer(token.getType())));
// No space needed after 'return' and 'typeof' when followed
// by '(', '[', '{', a string or a regexp.
if (offset < length) {
token = getToken(0);
if (token.getType() != Token.LP
&& token.getType() != Token.LB
&& token.getType() != Token.LC
&& token.getType() != Token.STRING
&& token.getType() != Token.REGEXP
&& token.getType() != Token.SEMI) {
result.append(' ');
}
}
break;
case Token.CASE:
case Token.THROW:
result.append(literals.get(new Integer(token.getType())));
// White-space needed after 'case' and 'throw' when not followed
// by a string.
if (offset < length && getToken(0).getType() != Token.STRING) {
result.append(' ');
}
break;
case Token.BREAK:
case Token.CONTINUE:
result.append(literals.get(new Integer(token.getType())));
if (offset < length && getToken(0).getType() != Token.SEMI) {
// If 'break' or 'continue' is not followed by a
// semi-colon（分号）, it must
// be followed by a label, hence(因此) the need for a white
// space.
result.append(' ');
}
break;
case Token.LC:
result.append("{"); // nomodify
braceNesting++;
break;
case Token.RC:
result.append('}');
braceNesting--;
assert braceNesting >= currentScope.getBraceNesting();
if (braceNesting == currentScope.getBraceNesting()) {
leaveCurrentScope();
}
break;
case Token.SEMI:
// No need to output a semi-colon if the next character is a
// right-curly...
if (preserveAllSemiColons || offset < length && getToken(0).getType() != Token.RC) {
result.append(';');
}
if (linebreakpos >= 0 && result.length() - linestartpos > linebreakpos) {
// Some source control tools don't like it when files
// containing lines longer
// than, say 8000 characters, are checked in. The linebreak
// option is used in
// that case to split long lines after a specific column.
result.append('\n');
linestartpos = result.length();
}
break;
case Token.COMMA:
// No need to output a comma if the next character is a
// right-curly or a right-square bracket
if (offset < length
&& getToken(0).getType() != Token.RC
&& getToken(0).getType() != Token.RB) {
result.append(',');
}
break;
case Token.CONDCOMMENT:
case Token.KEEPCOMMENT:
if (result.length() > 0 && result.charAt(result.length() - 1) != '\n') {
result.append("\n");
}
result.append("/*");
if (token.getType() == Token.KEEPCOMMENT) {
result.append("!");
}
result.append(symbol);
result.append("*/\n");
break;
// begin--这个分支用于实现压扁控制流
// 此分支将if(expression){...}else if(expression){...}else{...}转化为
// switch(expression){case true:原if块;break;case false:原else块;break;}
case Token.IF:
if (!EditOptionPanel.checkBoxFlatten.isSelected()) {
result.append(symbol);
break;
}
FlattenIF flattenIF = new FlattenIF(offset, length, tokens, currentScope);
String switchBlock = flattenIF.flattenIF();
result.append(switchBlock);
offset = flattenIF.offset;
break;
case Token.WHILE:
if (!EditOptionPanel.checkBoxOpacity.isSelected()) {
result.append(symbol);
break;
}
result.append(symbol);
OpacityPredicate opacityPredicateWhile =
new OpacityPredicate(offset, tokens, currentScope);
String whileBlock = opacityPredicateWhile.opacityPredicateWhile();
result.append(whileBlock);
offset = opacityPredicateWhile.offset;
break;
case Token.DO:
if (!EditOptionPanel.checkBoxOpacity.isSelected()) {
result.append(symbol);
break;
}
result.append(symbol);
OpacityPredicate opacityPredicateDoWhile =
new OpacityPredicate(offset, tokens, currentScope);
String doWhileBlock = opacityPredicateDoWhile.opacityPredicateDoWhile();
result.append(doWhileBlock);
offset = opacityPredicateDoWhile.offset;
break;
// end
default:
String literal = literals.get(new Integer(token.getType()));
if (literal != null) {
result.append(literal);
} else {
warn("此标志符不能被打印出来：" + symbol, true);
}
break;
}
}
// Append a semi-colon at the end, even if unnecessary semi-colons are
// supposed to be removed. This is especially useful when concatenating
// several minified files (the absence of an ending semi-colon at the
// end of one file may very likely cause a syntax error)
/*if (!preserveAllSemiColons && result.length() > 0
&& getToken(-1).getType() != Token.CONDCOMMENT
&& getToken(-1).getType() != Token.KEEPCOMMENT) {
if (result.charAt(result.length() - 1) == '\n') {
result.setCharAt(result.length() - 1, ';');
} else {
result.append(';');
}
}*/
// 暂时用不上，注释掉
return result;
}