private AstRoot parse(
String string, final String[] errors, final String[] warnings, boolean jsdoc) {
TestErrorReporter testErrorReporter =
new TestErrorReporter(errors, warnings) {
@Override
public EvaluatorException runtimeError(
String message, String sourceName, int line, String lineSource, int lineOffset) {
if (errors == null) {
throw new UnsupportedOperationException();
}
return new EvaluatorException(message, sourceName, line, lineSource, lineOffset);
}
};
environment.setErrorReporter(testErrorReporter);
environment.setRecordingComments(true);
environment.setRecordingLocalJsDocComments(jsdoc);
Parser p = new Parser(environment, testErrorReporter);
AstRoot script = null;
try {
script = p.parse(string, null, 0);
} catch (EvaluatorException e) {
if (errors == null) {
// EvaluationExceptions should not occur when we aren't expecting
// errors.
throw e;
}
}
assertTrue(testErrorReporter.hasEncounteredAllErrors());
assertTrue(testErrorReporter.hasEncounteredAllWarnings());
return script;
}
private AstRoot parse(CharSequence cs) {
CompilerEnvirons compilerEnv = new CompilerEnvirons();
compilerEnv.initFromContext(cx);
ErrorReporter compilationErrorReporter = compilerEnv.getErrorReporter();
Parser p = new Parser(compilerEnv, compilationErrorReporter);
return p.parse(cs.toString(), "<eval>", 1);
}
public Replacer createReplacer(String path, String source, ReplaceAdvisor advisor) {
CompilerEnvironsImpl env = new CompilerEnvironsImpl();
Parser parser = env.createParser();
AstRoot root = parser.parse(source, path, 1);
IRFactory irf = new IRFactory(env, env);
ScriptNode tree = irf.transformTree(root);
return new ScriptReplacer(tree, advisor);
}
// 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 AstRoot parseAsReader(String string) throws IOException {
TestErrorReporter testErrorReporter = new TestErrorReporter(null, null);
environment.setErrorReporter(testErrorReporter);
environment.setRecordingComments(true);
environment.setRecordingLocalJsDocComments(true);
Parser p = new Parser(environment, testErrorReporter);
AstRoot script = p.parse(new StringReader(string), null, 0);
assertTrue(testErrorReporter.hasEncounteredAllErrors());
assertTrue(testErrorReporter.hasEncounteredAllWarnings());
return script;
}
protected void parse() throws EvaluatorException {
// Parse script source
CompilerEnvirons ce = new CompilerEnvirons();
ScriptParserErrorReporter errorReporter = new ScriptParserErrorReporter();
ce.setGenerateDebugInfo(true);
ce.initFromContext(ContextFactory.getGlobal().enterContext());
ce.setErrorReporter(errorReporter);
Parser p = new Parser(ce, errorReporter);
ScriptOrFnNode ast = p.parse(this.scriptSource, "script", 0);
recursiveParse(ast);
this.scriptParsed = true;
}
@Override
public void filter(Reader reader, Writer writer) {
try {
CompilerEnvirons config = new CompilerEnvirons();
// 'float' is otherwise considered a reserved keyword (usage: element.style.float = 'left').
config.setReservedKeywordAsIdentifier(true);
// Force the parser to build the parent scope chain.
config.setIdeMode(true);
Parser parser = new Parser(config);
AstRoot root = parser.parse(reader, null, 0);
// Filter the AST.
for (NodeVisitor filter : filters) {
root.visit(filter);
}
// Back to source.
writer.write(root.toSource());
} catch (IOException e) {
LOGGER.error("Failed to rewrite JavaScript code.", e);
}
}
/**
* Parse some JavaScript to a simple AST.
*
* @param code The JavaScript source code to parse.
* @return The AST node.
*/
public AstNode parse(String code) {
Parser p = new Parser(compilerEnvirons, null);
// System.out.print(code+"*******\n");
return p.parse(code, null, 0);
}