src/test/java/org/apache/commons/jexl3/parser/ParserTest.java

/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You 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.apache.commons.jexl3.parser;

import java.io.StringReader;

import org.apache.commons.jexl3.JexlException;
import org.apache.commons.jexl3.JexlFeatures;
import org.junit.Assert;
import org.junit.Test;

/**
 * @since 1.0
 *
 */
public class ParserTest {
    static final JexlFeatures FEATURES = new JexlFeatures();
    public ParserTest() {}

    /**
     * See if we can parse simple scripts
     */
    @Test
    public void testParse() throws Exception {
        final Parser parser = new Parser(new StringReader(";"));
        JexlNode sn;
        sn = parser.parse(null, FEATURES, "foo = 1;", null);
        Assert.assertNotNull("parsed node is null", sn);

        sn = parser.parse(null, FEATURES, "foo = \"bar\";", null);
        Assert.assertNotNull("parsed node is null", sn);

        sn = parser.parse(null, FEATURES, "foo = 'bar';", null);
        Assert.assertNotNull("parsed node is null", sn);
    }

    @Test
    public void testErrorAssign() throws Exception {
        final String[] ops = { "=", "+=", "-=", "/=", "*=", "^=", "&=", "|=" };
        for(final String op : ops) {
            final Parser parser = new Parser(new StringReader(";"));
            try {
                final JexlNode sn = parser.parse(null, FEATURES, "foo() "+op+" 1;", null);
                Assert.fail("should have failed on invalid assignment " + op);
            } catch (final JexlException.Parsing xparse) {
                // ok
                final String ss = xparse.getDetail();
                final String sss = xparse.toString();
            }
        }
    }

    @Test
    public void testErrorAmbiguous() throws Exception {
        final Parser parser = new Parser(new StringReader(";"));
        try {
            final JexlNode sn = parser.parse(null, FEATURES, "x = 1 y = 5", null);
            Assert.fail("should have failed on ambiguous statement");
        } catch (final JexlException.Ambiguous xambiguous) {
            // ok
        } catch(final JexlException xother) {
            Assert.fail(xother.toString());
        }
    }
        
    @Test
    public void testIdentifierEscape() {
        final String[] ids = new String[]{"a\\ b", "a\\ b\\ c", "a\\'b\\\"c", "a\\ \\ c"};
        for(final String id : ids) {
            final String esc0 = StringParser.unescapeIdentifier(id);
            Assert.assertFalse(esc0.contains("\\"));
            final String esc1 = StringParser.escapeIdentifier(esc0);
            Assert.assertEquals(id, esc1);
        }
    }

    /**
     * Test the escaped control characters.
     */
    @Test
    public void testControlCharacters() {
        // Both '' and "" are valid JEXL string
        // The array of tuples where the first element is an expected result and the second element is a test string.
        final String[][] strings = new String[][] {
            new String[] {"a\nb\tc", "'a\nb\tc'"}, // we still honor the actual characters
            new String[] {"a\nb\tc", "'a\\nb\\tc'"},
            new String[] {"a\nb\tc", "\"a\\nb\\tc\""},
            new String[] {"\b\t\n\f\r", "'\\b\\t\\n\\f\\r'"},
            new String[] {"'hi'", "'\\'hi\\''"},
            new String[] {"\"hi\"", "'\"hi\"'"},
            new String[] {"\"hi\"", "'\"hi\"'"},
        };
        for(final String[] pair: strings) {
            final String output = StringParser.buildString(pair[1], true);
            Assert.assertEquals(pair[0], output);
        }
    }
}