private static String getPath(Map<String, Object> map, String part) {
Object obj = "/".equals(part) ? null : map.get(part);
if (obj == null) {
obj = map.get("/");
if (obj != null) {
return (String) obj;
}
obj = map.get("*");
String path = (String) obj;
if (path != null && path.endsWith("*")) {
return path.substring(0, path.length() - 1) + part;
} else {
return path;
}
}
if (obj instanceof String) {
return (String) obj;
}
map = (Map<String, Object>) obj;
obj = map.get("/");
if (obj != null) {
return (String) obj;
}
obj = map.get("*");
return (String) obj;
}
/** Registers the given script as a top-level script in the debugger. */
private void registerTopScript(DebuggableScript topScript, String source) {
if (!topScript.isTopLevel()) {
throw new IllegalArgumentException();
}
String url = getNormalizedUrl(topScript);
DebuggableScript[] functions = getAllFunctions(topScript);
final SourceInfo sourceInfo = new SourceInfo(source, functions, url);
synchronized (urlToSourceInfo) {
SourceInfo old = urlToSourceInfo.get(url);
if (old != null) {
sourceInfo.copyBreakpointsFrom(old);
}
urlToSourceInfo.put(url, sourceInfo);
for (int i = 0; i != sourceInfo.functionSourcesTop(); ++i) {
FunctionSource fsource = sourceInfo.functionSource(i);
String name = fsource.name();
if (name.length() != 0) {
functionNames.put(name, fsource);
}
}
}
synchronized (functionToSource) {
for (int i = 0; i != functions.length; ++i) {
FunctionSource fsource = sourceInfo.functionSource(i);
functionToSource.put(functions[i], fsource);
}
}
callback.updateSourceText(sourceInfo);
}
public static ScriptableObject require(
Context cx, Scriptable thisObj, Object[] args, Function funObj)
throws ScriptException, IOException {
String functionName = "require";
int argsCount = args.length;
if (argsCount != 1) {
HostObjectUtil.invalidNumberOfArgs(
CommonManager.HOST_OBJECT_NAME, functionName, argsCount, false);
}
if (!(args[0] instanceof String)) {
HostObjectUtil.invalidArgsError(
CommonManager.HOST_OBJECT_NAME, functionName, "1", "string", args[0], false);
}
String moduleId = (String) args[0];
int dotIndex = moduleId.lastIndexOf(".");
if (moduleId.length() == dotIndex + 1) {
String msg = "Invalid file path for require method : " + moduleId;
log.error(msg);
throw new ScriptException(msg);
}
JaggeryContext jaggeryContext = CommonManager.getJaggeryContext();
Map<String, ScriptableObject> requiredModules =
(Map<String, ScriptableObject>)
jaggeryContext.getProperty(Constants.JAGGERY_REQUIRED_MODULES);
ScriptableObject object = requiredModules.get(moduleId);
if (object != null) {
return object;
}
if (dotIndex == -1) {
object = CommonManager.require(cx, thisObj, args, funObj);
initModule(cx, jaggeryContext, moduleId, object);
} else {
object = (ScriptableObject) cx.newObject(thisObj);
object.setPrototype(thisObj);
object.setParentScope(null);
String ext = moduleId.substring(dotIndex + 1);
if (ext.equalsIgnoreCase("json")) {
object = executeScript(jaggeryContext, object, moduleId, true, true, false);
} else if (ext.equalsIgnoreCase("js")) {
object = executeScript(jaggeryContext, object, moduleId, false, true, false);
} else if (ext.equalsIgnoreCase("jag")) {
object = executeScript(jaggeryContext, object, moduleId, false, false, false);
} else {
String msg = "Unsupported file type for require() method : ." + ext;
log.error(msg);
throw new ScriptException(msg);
}
}
requiredModules.put(moduleId, object);
return object;
}
// 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;
}
private static String resolveScriptPath(List<String> parts, Map<String, Object> map) {
String part = parts.remove(0);
if (parts.isEmpty()) {
return getPath(map, part);
}
Object obj = map.get(part);
if (obj == null) {
return getPath(map, "/");
}
if (obj instanceof Map) {
return resolveScriptPath(parts, (Map<String, Object>) obj);
}
return null;
}
private static ScriptableObject executeScript(
JaggeryContext jaggeryContext,
ScriptableObject scope,
String fileURL,
final boolean isJSON,
boolean isBuilt,
boolean isIncludeOnce)
throws ScriptException {
Stack<String> includesCallstack = CommonManager.getCallstack(jaggeryContext);
Map<String, Boolean> includedScripts = CommonManager.getIncludes(jaggeryContext);
ServletContext context = (ServletContext) jaggeryContext.getProperty(Constants.SERVLET_CONTEXT);
String parent = includesCallstack.lastElement();
String keys[] = WebAppManager.getKeys(context.getContextPath(), parent, fileURL);
fileURL = getNormalizedScriptPath(keys);
if (includesCallstack.search(fileURL) != -1) {
return scope;
}
if (isIncludeOnce && includedScripts.get(fileURL) != null) {
return scope;
}
ScriptReader source;
RhinoEngine engine = jaggeryContext.getEngine();
if (isBuilt) {
source =
new ScriptReader(context.getResourceAsStream(fileURL)) {
@Override
protected void build() throws IOException {
try {
if (isJSON) {
sourceReader =
new StringReader("(" + HostObjectUtil.streamToString(sourceIn) + ")");
} else {
sourceReader = new StringReader(HostObjectUtil.streamToString(sourceIn));
}
} catch (ScriptException e) {
throw new IOException(e);
}
}
};
} else {
source = new ScriptReader(context.getResourceAsStream(fileURL));
}
ScriptCachingContext sctx =
new ScriptCachingContext(jaggeryContext.getTenantId(), keys[0], keys[1], keys[2]);
sctx.setSecurityDomain(new JaggerySecurityDomain(fileURL, context));
long lastModified = WebAppManager.getScriptLastModified(context, fileURL);
sctx.setSourceModifiedTime(lastModified);
includedScripts.put(fileURL, true);
includesCallstack.push(fileURL);
if (isJSON) {
scope = (ScriptableObject) engine.eval(source, scope, sctx);
} else {
engine.exec(source, scope, sctx);
}
includesCallstack.pop();
return scope;
}
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;
}
/** Returns the SourceInfo object for the given URL. */
public SourceInfo sourceInfo(String url) {
return urlToSourceInfo.get(url);
}
/** Returns the FunctionSource object for the function with the given name. */
public FunctionSource functionSourceByName(String functionName) {
return functionNames.get(functionName);
}
/** Returns the FunctionSource object for the given function or script. */
private FunctionSource functionSource(DebuggableScript fnOrScript) {
return functionToSource.get(fnOrScript);
}