org.codehaus.groovy.tools.shell.util.CurlyCountingGroovyLexer.groovy Maven / Gradle / Ivy

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/*
 * Copyright 2003-2013 the original author or authors.
 *
 * Licensed under the Apache License, Version 2.0 (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.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.codehaus.groovy.tools.shell.util

import org.codehaus.groovy.antlr.GroovySourceToken
import org.codehaus.groovy.antlr.SourceBuffer
import org.codehaus.groovy.antlr.UnicodeEscapingReader
import org.codehaus.groovy.antlr.parser.GroovyLexer
import org.codehaus.groovy.antlr.parser.GroovyTokenTypes

/**
 * patching GroovyLexer to get access to Paren level
 */
class CurlyCountingGroovyLexer extends GroovyLexer {

    private endReached = false

    protected CurlyCountingGroovyLexer(Reader reader) {
        super(reader)
    }

    static CurlyCountingGroovyLexer createGroovyLexer(String src) {
        Reader unicodeReader = new UnicodeEscapingReader(new StringReader(src.toString()), new SourceBuffer())
        CurlyCountingGroovyLexer lexer = new CurlyCountingGroovyLexer(unicodeReader)
        unicodeReader.setLexer(lexer)
        return lexer
    }

    int getParenLevel() {
        return parenLevelStack.size()
    }

    // called by nextToken()
    @Override
    void uponEOF() {
        super.uponEOF()
        endReached = true
    }

    List toList() {
        List tokens = []
        GroovySourceToken token
        while (! endReached) {
            token = nextToken() as GroovySourceToken
            tokens.add(token)
            if (token.type == GroovyTokenTypes.EOF) {
                break
            }
        }
        return tokens
    }
}