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Groovy example source code file (AstStringCompiler.groovy)

This example Groovy source code file (AstStringCompiler.groovy) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Java - Groovy tags/keywords

aststringcompiler, compilationunit, compilephase, groovyclassloader, groovyclassloader, groovycodesource, groovycodesource, list, list, modulenode, packagescope, packagescope

The Groovy AstStringCompiler.groovy source code

/*
 * Copyright 2003-2010 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.ast.builder

import groovy.transform.PackageScope
import org.codehaus.groovy.ast.ASTNode
import org.codehaus.groovy.control.CompilePhase
import org.codehaus.groovy.control.CompilationUnit
import org.codehaus.groovy.ast.ModuleNode
import org.codehaus.groovy.control.CompilerConfiguration

/**
 * This class handles converting Strings to ASTNode lists.
 *
 * @author Hamlet D'Arcy
 */
@PackageScope class AstStringCompiler {
    
    /**
     * Performs the String source to {@link List} of {@link ASTNode}.
     *
     * @param script
     *      a Groovy script in String form
     * @param compilePhase
     *      the int based CompilePhase to compile it to.
     * @param statementsOnly
     */
    List<ASTNode> compile(String script, CompilePhase compilePhase, boolean statementsOnly) {
        def scriptClassName = "script" + System.currentTimeMillis()
        GroovyClassLoader classLoader = new GroovyClassLoader()
        GroovyCodeSource codeSource = new GroovyCodeSource(script, scriptClassName + ".groovy", "/groovy/script")
        CompilationUnit cu = new CompilationUnit(CompilerConfiguration.DEFAULT, codeSource.codeSource, classLoader)
        cu.addSource(codeSource.getName(), script);
        cu.compile(compilePhase.getPhaseNumber())
        // collect all the ASTNodes into the result, possibly ignoring the script body if desired
        return cu.ast.modules.inject([]) {List acc, ModuleNode node ->
            if (node.statementBlock) acc.add(node.statementBlock)
            node.classes?.each {
                if (!(it.name == scriptClassName && statementsOnly)) {
                    acc << it
                }
            }
            acc
        }
    }

}

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