Java Parser类代码示例

import jdk.nashorn.internal.parser.Parser; //导入依赖的package包/类
private void scan(File root, File file) throws Exception {
    if (file.isDirectory()) {
        for (File child : file.listFiles()) {
            String ext = FilenameUtils.getExtension(child.getName());
            if (child.isFile() && !"js".equals(ext)) {
                continue;
            }
            if ("C:\\websites\\studio.zenplanner.local\\zenplanner\\studio\\js\\lib".equals(child.getPath())) {
                continue; // TODO: Un hard code
            }
            scan(root, child);
        }
    } else {
        Source source = (Source) cons.invoke(null, file.getName(), file);

        Parser parser = new Parser(context.getEnv(), source, errors);
        FunctionNode functionNode = parser.parse();
        new StatementScanner(graph, map, root, file).scan(functionNode); // TODO: better OO
    }
}
 

import jdk.nashorn.internal.parser.Parser; //导入依赖的package包/类
private static void checkFunctionParameters(final String params) {
    final Parser parser = getParser(params);
    try {
        parser.parseFormalParameterList();
    } catch (final ParserException pe) {
        pe.throwAsEcmaException();
    }
}
 

import jdk.nashorn.internal.parser.Parser; //导入依赖的package包/类
private static void checkFunctionBody(final String funcBody) {
    final Parser parser = getParser(funcBody);
    try {
        parser.parseFunctionBody();
    } catch (final ParserException pe) {
        pe.throwAsEcmaException();
    }
}
 

import jdk.nashorn.internal.parser.Parser; //导入依赖的package包/类
FunctionNode reparse() {
    if (isSerialized()) {
        return deserialize();
    }

    final int descPosition = Token.descPosition(token);
    final Context context = Context.getContextTrusted();
    final Parser parser = new Parser(
        context.getEnv(),
        source,
        new Context.ThrowErrorManager(),
        isStrict(),
        // source starts at line 0, so even though lineNumber is the correct declaration line, back off
        // one to make it exclusive
        lineNumber - 1,
        context.getLogger(Parser.class));

    if (getFunctionFlag(FunctionNode.IS_ANONYMOUS)) {
        parser.setFunctionName(functionName);
    }
    parser.setReparsedFunction(this);

    final FunctionNode program = parser.parse(CompilerConstants.PROGRAM.symbolName(), descPosition,
            Token.descLength(token), true);
    // Parser generates a program AST even if we're recompiling a single function, so when we are only
    // recompiling a single function, extract it from the program.
    return (isProgram() ? program : extractFunctionFromScript(program)).setName(null, functionName);
}
 

import jdk.nashorn.internal.parser.Parser; //导入依赖的package包/类
/**
 * Returns AST as JSON compatible string.
 *
 * @param context context
 * @param code code to be parsed
 * @param name name of the code source (used for location)
 * @param includeLoc tells whether to include location information for nodes or not
 * @return JSON string representation of AST of the supplied code
 */
public static String parse(final Context context, final String code, final String name, final boolean includeLoc) {
    final Parser       parser     = new Parser(context.getEnv(), sourceFor(name, code), new Context.ThrowErrorManager(), context.getEnv()._strict, context.getLogger(Parser.class));
    final JSONWriter   jsonWriter = new JSONWriter(includeLoc);
    try {
        final FunctionNode functionNode = parser.parse(); //symbol name is ":program", default
        functionNode.accept(jsonWriter);
        return jsonWriter.getString();
    } catch (final ParserException e) {
        e.throwAsEcmaException();
        return null;
    }
}
 

import jdk.nashorn.internal.parser.Parser; //导入依赖的package包/类
/**
 * Parse potentially partial code and keep track of the start of last expression.
 * This 'partial' parsing support is meant to be used for code-completion.
 *
 * @param context the nashorn context
 * @param code code that is to be parsed
 * @return the start index of the last expression parsed in the (incomplete) code.
 */
@Override
public final int getLastExpressionStart(final Context context, final String code) {
    final int[] exprStart = { -1 };

    final Parser p = new Parser(context.getEnv(), sourceFor("<partial_code>", code),new Context.ThrowErrorManager()) {
        @Override
        protected Expression expression() {
            exprStart[0] = this.start;
            return super.expression();
        }

        @Override
        protected Expression assignmentExpression(final boolean noIn) {
            exprStart[0] = this.start;
            return super.assignmentExpression(noIn);
        }
    };

    try {
        p.parse();
    } catch (final Exception ignored) {
        // throw any parser exception, but we are partial parsing anyway
    }

    return exprStart[0];
}
 

import jdk.nashorn.internal.parser.Parser; //导入依赖的package包/类
FunctionNode reparse() {
    if (isSerialized()) {
        return deserialize();
    }

    final int descPosition = Token.descPosition(token);
    final Context context = Context.getContextTrusted();
    final Parser parser = new Parser(
        context.getEnv(),
        source,
        new Context.ThrowErrorManager(),
        isStrict(),
        // source starts at line 0, so even though lineNumber is the correct declaration line, back off
        // one to make it exclusive
        lineNumber - 1,
        context.getLogger(Parser.class));

    if (getFunctionFlag(FunctionNode.IS_ANONYMOUS)) {
        parser.setFunctionName(functionName);
    }
    parser.setReparsedFunction(this);

    final FunctionNode program = parser.parse(CompilerConstants.PROGRAM.symbolName(), descPosition,
            Token.descLength(token), isPropertyAccessor());
    // Parser generates a program AST even if we're recompiling a single function, so when we are only
    // recompiling a single function, extract it from the program.
    return (isProgram() ? program : extractFunctionFromScript(program)).setName(null, functionName);
}
 

import jdk.nashorn.internal.parser.Parser; //导入依赖的package包/类
private static void checkFunctionParameters(final String params) {
    final Source src = new Source("<function>", params);
    final Parser parser = new Parser(Global.getEnv(), src, new Context.ThrowErrorManager());
    try {
        parser.parseFormalParameterList();
    } catch (final ParserException pe) {
        pe.throwAsEcmaException();
    }
}
 

import jdk.nashorn.internal.parser.Parser; //导入依赖的package包/类
private static void checkFunctionBody(final String funcBody) {
    final Source src = new Source("<function>", funcBody);
    final Parser parser = new Parser(Global.getEnv(), src, new Context.ThrowErrorManager());
    try {
        parser.parseFunctionBody();
    } catch (final ParserException pe) {
        pe.throwAsEcmaException();
    }
}
 

import jdk.nashorn.internal.parser.Parser; //导入依赖的package包/类
/**
 * Returns AST as JSON compatible string.
 *
 * @param env  script environment to use
 * @param code code to be parsed
 * @param name name of the code source (used for location)
 * @param includeLoc tells whether to include location information for nodes or not
 * @return JSON string representation of AST of the supplied code
 */
public static String parse(final ScriptEnvironment env, final String code, final String name, final boolean includeLoc) {
    final Parser       parser     = new Parser(env, new Source(name, code), new Context.ThrowErrorManager(), env._strict);
    final JSONWriter   jsonWriter = new JSONWriter(includeLoc);
    try {
        final FunctionNode functionNode = parser.parse(CompilerConstants.RUN_SCRIPT.symbolName());
        functionNode.accept(jsonWriter);
        return jsonWriter.getString();
    } catch (final ParserException e) {
        e.throwAsEcmaException();
        return null;
    }
}
 

import jdk.nashorn.internal.parser.Parser; //导入依赖的package包/类
/**
 * Compiles the given script files in the command line
 *
 * @param context the nashorn context
 * @param global the global scope
 * @param files the list of script files to compile
 *
 * @return error code
 * @throws IOException when any script file read results in I/O error
 */
private static int compileScripts(final Context context, final ScriptObject global, final List<String> files) throws IOException {
    final ScriptObject oldGlobal = Context.getGlobal();
    final boolean globalChanged = (oldGlobal != global);
    final ScriptEnvironment env = context.getEnv();
    try {
        if (globalChanged) {
            Context.setGlobal(global);
        }
        final ErrorManager errors = context.getErrorManager();

        // For each file on the command line.
        for (final String fileName : files) {
            final FunctionNode functionNode = new Parser(env, new Source(fileName, new File(fileName)), errors).parse();

            if (errors.getNumberOfErrors() != 0) {
                return COMPILATION_ERROR;
            }

            if (env._print_ast) {
                context.getErr().println(new ASTWriter(functionNode));
            }

            if (env._print_parse) {
                context.getErr().println(new PrintVisitor(functionNode));
            }

            //null - pass no code installer - this is compile only
            new Compiler(env).compile(functionNode);
        }
    } finally {
        env.getOut().flush();
        env.getErr().flush();
        if (globalChanged) {
            Context.setGlobal(oldGlobal);
        }
    }

    return SUCCESS;
}
 

import jdk.nashorn.internal.parser.Parser; //导入依赖的package包/类
public static void main(String[] args) throws IOException {
    Options options = new Options("nashorn");
    options.set("anon.functions", true);
    options.set("parse.only", true);
    options.set("scripting", true);

    ErrorManager errors = new ErrorManager();
    Context context = new Context(options, errors, Thread.currentThread().getContextClassLoader());
    Source source = Source.sourceFor("test",
        new File("/Users/tudesheng/projects/static/bms-fs/src/ibms/wsa/stock/stockIn/stockManage.js"),
        Charsets.UTF_8);
    Parser parser = new Parser(context.getEnv(), source, errors);

    FunctionNode functionNode = parser.parse();
    Block block = functionNode.getBody();
    List<Statement> statements = block.getStatements();
    for (Statement statement : statements) {
        statement.accept(new NodeVisitor<LexicalContext>(new LexicalContext()) {
            @Override
            public boolean enterLiteralNode(LiteralNode<?> literalNode) {
                if (literalNode.isString())
                    System.out.println(literalNode.getString());
                return super.enterLiteralNode(literalNode);
            }
        });
    }
}