Java example source code file (RETest.java)
The RETest.java Java example source code/*
* reserved comment block
* DO NOT REMOVE OR ALTER!
*/
/*
* Copyright 1999-2004 The Apache Software Foundation.
*
* 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 com.sun.org.apache.regexp.internal;
import java.io.BufferedReader;
import java.io.FileReader;
import java.io.InputStreamReader;
import java.io.PrintWriter;
import java.io.File;
import java.io.ByteArrayOutputStream;
import java.io.ObjectOutputStream;
import java.io.ByteArrayInputStream;
import java.io.ObjectInputStream;
import java.io.StringBufferInputStream;
import java.io.StringReader;
import java.io.IOException;
/**
* Data driven (and optionally interactive) testing harness to exercise regular
* expression compiler and matching engine.
*
* @author <a href="mailto:jonl@muppetlabs.com">Jonathan Locke
* @author <a href="mailto:jon@latchkey.com">Jon S. Stevens
* @author <a href="mailto:gholam@xtra.co.nz">Michael McCallum
*/
public class RETest
{
// True if we want to see output from success cases
static final boolean showSuccesses = false;
// A new line character.
static final String NEW_LINE = System.getProperty( "line.separator" );
// Construct a debug compiler
REDebugCompiler compiler = new REDebugCompiler();
/**
* Main program entrypoint. If an argument is given, it will be compiled
* and interactive matching will ensue. If no argument is given, the
* file RETest.txt will be used as automated testing input.
* @param args Command line arguments (optional regular expression)
*/
public static void main(String[] args)
{
try
{
if (!test( args )) {
System.exit(1);
}
}
catch (Exception e)
{
e.printStackTrace();
System.exit(1);
}
}
/**
* Testing entrypoint.
* @param args Command line arguments
* @exception Exception thrown in case of error
*/
public static boolean test( String[] args ) throws Exception
{
RETest test = new RETest();
// Run interactive tests against a single regexp
if (args.length == 2)
{
test.runInteractiveTests(args[1]);
}
else if (args.length == 1)
{
// Run automated tests
test.runAutomatedTests(args[0]);
}
else
{
System.out.println( "Usage: RETest ([-i] [regex]) ([/path/to/testfile.txt])" );
System.out.println( "By Default will run automated tests from file 'docs/RETest.txt' ..." );
System.out.println();
test.runAutomatedTests("docs/RETest.txt");
}
return test.failures == 0;
}
/**
* Constructor
*/
public RETest()
{
}
/**
* Compile and test matching against a single expression
* @param expr Expression to compile and test
*/
void runInteractiveTests(String expr)
{
RE r = new RE();
try
{
// Compile expression
r.setProgram(compiler.compile(expr));
// Show expression
say("" + NEW_LINE + "" + expr + "" + NEW_LINE + "");
// Show program for compiled expression
PrintWriter writer = new PrintWriter( System.out );
compiler.dumpProgram( writer );
writer.flush();
boolean running = true;
// Test matching against compiled expression
while ( running )
{
// Read from keyboard
BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
System.out.print("> ");
System.out.flush();
String match = br.readLine();
if ( match != null )
{
// Try a match against the keyboard input
if (r.match(match))
{
say("Match successful.");
}
else
{
say("Match failed.");
}
// Show subparen registers
showParens(r);
}
else
{
running = false;
System.out.println();
}
}
}
catch (Exception e)
{
say("Error: " + e.toString());
e.printStackTrace();
}
}
/**
* Exit with a fatal error.
* @param s Last famous words before exiting
*/
void die(String s)
{
say("FATAL ERROR: " + s);
System.exit(-1);
}
/**
* Fail with an error. Will print a big failure message to System.out.
*
* @param log Output before failure
* @param s Failure description
*/
void fail(StringBuffer log, String s)
{
System.out.print(log.toString());
fail(s);
}
/**
* Fail with an error. Will print a big failure message to System.out.
*
* @param s Failure description
*/
void fail(String s)
{
failures++;
say("" + NEW_LINE + "");
say("*******************************************************");
say("********************* FAILURE! **********************");
say("*******************************************************");
say("" + NEW_LINE + "");
say(s);
say("");
// make sure the writer gets flushed.
if (compiler != null) {
PrintWriter writer = new PrintWriter( System.out );
compiler.dumpProgram( writer );
writer.flush();
say("" + NEW_LINE + "");
}
}
/**
* Say something to standard out
* @param s What to say
*/
void say(String s)
{
System.out.println(s);
}
/**
* Dump parenthesized subexpressions found by a regular expression matcher object
* @param r Matcher object with results to show
*/
void showParens(RE r)
{
// Loop through each paren
for (int i = 0; i < r.getParenCount(); i++)
{
// Show paren register
say("$" + i + " = " + r.getParen(i));
}
}
/*
* number in automated test
*/
int testCount = 0;
/*
* Count of failures in automated test
*/
int failures = 0;
/**
* Run automated tests in RETest.txt file (from Perl 4.0 test battery)
* @exception Exception thrown in case of error
*/
void runAutomatedTests(String testDocument) throws Exception
{
long ms = System.currentTimeMillis();
// Some unit tests
testPrecompiledRE();
testSplitAndGrep();
testSubst();
testOther();
// Test from script file
File testInput = new File(testDocument);
if (! testInput.exists()) {
throw new Exception ("Could not find: " + testDocument);
}
BufferedReader br = new BufferedReader(new FileReader(testInput));
try
{
// While input is available, parse lines
while (br.ready())
{
RETestCase testcase = getNextTestCase(br);
if (testcase != null) {
testcase.runTest();
}
}
}
finally
{
br.close();
}
// Show match time
say(NEW_LINE + NEW_LINE + "Match time = " + (System.currentTimeMillis() - ms) + " ms.");
// Print final results
if (failures > 0) {
say("*************** THERE ARE FAILURES! *******************");
}
say("Tests complete. " + testCount + " tests, " + failures + " failure(s).");
}
/**
* Run automated unit test
* @exception Exception thrown in case of error
*/
void testOther() throws Exception
{
// Serialization test 1: Compile regexp and serialize/deserialize it
RE r = new RE("(a*)b");
say("Serialized/deserialized (a*)b");
ByteArrayOutputStream out = new ByteArrayOutputStream(128);
new ObjectOutputStream(out).writeObject(r);
ByteArrayInputStream in = new ByteArrayInputStream(out.toByteArray());
r = (RE)new ObjectInputStream(in).readObject();
if (!r.match("aaab"))
{
fail("Did not match 'aaab' with deserialized RE.");
} else {
say("aaaab = true");
showParens(r);
}
// Serialization test 2: serialize/deserialize used regexp
out.reset();
say("Deserialized (a*)b");
new ObjectOutputStream(out).writeObject(r);
in = new ByteArrayInputStream(out.toByteArray());
r = (RE)new ObjectInputStream(in).readObject();
if (r.getParenCount() != 0)
{
fail("Has parens after deserialization.");
}
if (!r.match("aaab"))
{
fail("Did not match 'aaab' with deserialized RE.");
} else {
say("aaaab = true");
showParens(r);
}
// Test MATCH_CASEINDEPENDENT
r = new RE("abc(\\w*)");
say("MATCH_CASEINDEPENDENT abc(\\w*)");
r.setMatchFlags(RE.MATCH_CASEINDEPENDENT);
say("abc(d*)");
if (!r.match("abcddd"))
{
fail("Did not match 'abcddd'.");
} else {
say("abcddd = true");
showParens(r);
}
if (!r.match("aBcDDdd"))
{
fail("Did not match 'aBcDDdd'.");
} else {
say("aBcDDdd = true");
showParens(r);
}
if (!r.match("ABCDDDDD"))
{
fail("Did not match 'ABCDDDDD'.");
} else {
say("ABCDDDDD = true");
showParens(r);
}
r = new RE("(A*)b\\1");
r.setMatchFlags(RE.MATCH_CASEINDEPENDENT);
if (!r.match("AaAaaaBAAAAAA"))
{
fail("Did not match 'AaAaaaBAAAAAA'.");
} else {
say("AaAaaaBAAAAAA = true");
showParens(r);
}
r = new RE("[A-Z]*");
r.setMatchFlags(RE.MATCH_CASEINDEPENDENT);
if (!r.match("CaBgDe12"))
{
fail("Did not match 'CaBgDe12'.");
} else {
say("CaBgDe12 = true");
showParens(r);
}
// Test MATCH_MULTILINE. Test for eol/bol symbols.
r = new RE("^abc$", RE.MATCH_MULTILINE);
if (!r.match("\nabc")) {
fail("\"\\nabc\" doesn't match \"^abc$\"");
}
if (!r.match("\rabc")) {
fail("\"\\rabc\" doesn't match \"^abc$\"");
}
if (!r.match("\r\nabc")) {
fail("\"\\r\\nabc\" doesn't match \"^abc$\"");
}
if (!r.match("\u0085abc")) {
fail("\"\\u0085abc\" doesn't match \"^abc$\"");
}
if (!r.match("\u2028abc")) {
fail("\"\\u2028abc\" doesn't match \"^abc$\"");
}
if (!r.match("\u2029abc")) {
fail("\"\\u2029abc\" doesn't match \"^abc$\"");
}
// Test MATCH_MULTILINE. Test that '.' does not matches new line.
r = new RE("^a.*b$", RE.MATCH_MULTILINE);
if (r.match("a\nb")) {
fail("\"a\\nb\" matches \"^a.*b$\"");
}
if (r.match("a\rb")) {
fail("\"a\\rb\" matches \"^a.*b$\"");
}
if (r.match("a\r\nb")) {
fail("\"a\\r\\nb\" matches \"^a.*b$\"");
}
if (r.match("a\u0085b")) {
fail("\"a\\u0085b\" matches \"^a.*b$\"");
}
if (r.match("a\u2028b")) {
fail("\"a\\u2028b\" matches \"^a.*b$\"");
}
if (r.match("a\u2029b")) {
fail("\"a\\u2029b\" matches \"^a.*b$\"");
}
}
private void testPrecompiledRE()
{
// Pre-compiled regular expression "a*b"
char[] re1Instructions =
{
0x007c, 0x0000, 0x001a, 0x007c, 0x0000, 0x000d, 0x0041,
0x0001, 0x0004, 0x0061, 0x007c, 0x0000, 0x0003, 0x0047,
0x0000, 0xfff6, 0x007c, 0x0000, 0x0003, 0x004e, 0x0000,
0x0003, 0x0041, 0x0001, 0x0004, 0x0062, 0x0045, 0x0000,
0x0000,
};
REProgram re1 = new REProgram(re1Instructions);
// Simple test of pre-compiled regular expressions
RE r = new RE(re1);
say("a*b");
boolean result = r.match("aaab");
say("aaab = " + result);
showParens(r);
if (!result) {
fail("\"aaab\" doesn't match to precompiled \"a*b\"");
}
result = r.match("b");
say("b = " + result);
showParens(r);
if (!result) {
fail("\"b\" doesn't match to precompiled \"a*b\"");
}
result = r.match("c");
say("c = " + result);
showParens(r);
if (result) {
fail("\"c\" matches to precompiled \"a*b\"");
}
result = r.match("ccccaaaaab");
say("ccccaaaaab = " + result);
showParens(r);
if (!result) {
fail("\"ccccaaaaab\" doesn't match to precompiled \"a*b\"");
}
}
private void testSplitAndGrep()
{
String[] expected = {"xxxx", "xxxx", "yyyy", "zzz"};
RE r = new RE("a*b");
String[] s = r.split("xxxxaabxxxxbyyyyaaabzzz");
for (int i = 0; i < expected.length && i < s.length; i++) {
assertEquals("Wrong splitted part", expected[i], s[i]);
}
assertEquals("Wrong number of splitted parts", expected.length,
s.length);
r = new RE("x+");
expected = new String[] {"xxxx", "xxxx"};
s = r.grep(s);
for (int i = 0; i < s.length; i++)
{
say("s[" + i + "] = " + s[i]);
assertEquals("Grep fails", expected[i], s[i]);
}
assertEquals("Wrong number of string found by grep", expected.length,
s.length);
}
private void testSubst()
{
RE r = new RE("a*b");
String expected = "-foo-garply-wacky-";
String actual = r.subst("aaaabfooaaabgarplyaaabwackyb", "-");
assertEquals("Wrong result of substitution in \"a*b\"", expected, actual);
// Test subst() with backreferences
r = new RE("http://[\\.\\w\\-\\?/~_@&=%]+");
actual = r.subst("visit us: http://www.apache.org!",
"1234<a href=\"$0\">$0", RE.REPLACE_BACKREFERENCES);
assertEquals("Wrong subst() result", "visit us: 1234<a href=\"http://www.apache.org\">http://www.apache.org!", actual);
// Test subst() with backreferences without leading characters
// before first backreference
r = new RE("(.*?)=(.*)");
actual = r.subst("variable=value",
"$1_test_$212", RE.REPLACE_BACKREFERENCES);
assertEquals("Wrong subst() result", "variable_test_value12", actual);
// Test subst() with NO backreferences
r = new RE("^a$");
actual = r.subst("a",
"b", RE.REPLACE_BACKREFERENCES);
assertEquals("Wrong subst() result", "b", actual);
// Test subst() with NO backreferences
r = new RE("^a$", RE.MATCH_MULTILINE);
actual = r.subst("\r\na\r\n",
"b", RE.REPLACE_BACKREFERENCES);
assertEquals("Wrong subst() result", "\r\nb\r\n", actual);
}
public void assertEquals(String message, String expected, String actual)
{
if (expected != null && !expected.equals(actual)
|| actual != null && !actual.equals(expected))
{
fail(message + " (expected \"" + expected
+ "\", actual \"" + actual + "\")");
}
}
public void assertEquals(String message, int expected, int actual)
{
if (expected != actual) {
fail(message + " (expected \"" + expected
+ "\", actual \"" + actual + "\")");
}
}
/**
* Converts yesno string to boolean.
* @param yesno string representation of expected result
* @return true if yesno is "YES", false if yesno is "NO"
* stops program otherwise.
*/
private boolean getExpectedResult(String yesno)
{
if ("NO".equals(yesno))
{
return false;
}
else if ("YES".equals(yesno))
{
return true;
}
else
{
// Bad test script
die("Test script error!");
return false; //to please javac
}
}
/**
* Finds next test description in a given script.
* @param br <code>BufferedReader for a script file
* @return strign tag for next test description
* @exception IOException if some io problems occured
*/
private String findNextTest(BufferedReader br) throws IOException
{
String number = "";
while (br.ready())
{
number = br.readLine();
if (number == null)
{
break;
}
number = number.trim();
if (number.startsWith("#"))
{
break;
}
if (!number.equals(""))
{
say("Script error. Line = " + number);
System.exit(-1);
}
}
return number;
}
/**
* Creates testcase for the next test description in the script file.
* @param br <code>BufferedReader for script file.
* @return a new tescase or null.
* @exception IOException if some io problems occured
*/
private RETestCase getNextTestCase(BufferedReader br) throws IOException
{
// Find next re test case
final String tag = findNextTest(br);
// Are we done?
if (!br.ready())
{
return null;
}
// Get expression
final String expr = br.readLine();
// Get test information
final String matchAgainst = br.readLine();
final boolean badPattern = "ERR".equals(matchAgainst);
boolean shouldMatch = false;
int expectedParenCount = 0;
String[] expectedParens = null;
if (!badPattern) {
shouldMatch = getExpectedResult(br.readLine().trim());
if (shouldMatch) {
expectedParenCount = Integer.parseInt(br.readLine().trim());
expectedParens = new String[expectedParenCount];
for (int i = 0; i < expectedParenCount; i++) {
expectedParens[i] = br.readLine();
}
}
}
return new RETestCase(this, tag, expr, matchAgainst, badPattern,
shouldMatch, expectedParens);
}
}
final class RETestCase
{
final private StringBuffer log = new StringBuffer();
final private int number;
final private String tag; // number from script file
final private String pattern;
final private String toMatch;
final private boolean badPattern;
final private boolean shouldMatch;
final private String[] parens;
final private RETest test;
private RE regexp;
public RETestCase(RETest test, String tag, String pattern,
String toMatch, boolean badPattern,
boolean shouldMatch, String[] parens)
{
this.number = ++test.testCount;
this.test = test;
this.tag = tag;
this.pattern = pattern;
this.toMatch = toMatch;
this.badPattern = badPattern;
this.shouldMatch = shouldMatch;
if (parens != null) {
this.parens = new String[parens.length];
for (int i = 0; i < parens.length; i++) {
this.parens[i] = parens[i];
}
} else {
this.parens = null;
}
}
public void runTest()
{
test.say(tag + "(" + number + "): " + pattern);
if (testCreation()) {
testMatch();
}
}
boolean testCreation()
{
try
{
// Compile it
regexp = new RE();
regexp.setProgram(test.compiler.compile(pattern));
// Expression didn't cause an expected error
if (badPattern)
{
test.fail(log, "Was expected to be an error, but wasn't.");
return false;
}
return true;
}
// Some expressions *should* cause exceptions to be thrown
catch (Exception e)
{
// If it was supposed to be an error, report success and continue
if (badPattern)
{
log.append(" Match: ERR\n");
success("Produces an error (" + e.toString() + "), as expected.");
return false;
}
// Wasn't supposed to be an error
String message = (e.getMessage() == null) ? e.toString() : e.getMessage();
test.fail(log, "Produces an unexpected exception \"" + message + "\"");
e.printStackTrace();
}
catch (Error e)
{
// Internal error happened
test.fail(log, "Compiler threw fatal error \"" + e.getMessage() + "\"");
e.printStackTrace();
}
return false;
}
private void testMatch()
{
log.append(" Match against: '" + toMatch + "'\n");
// Try regular matching
try
{
// Match against the string
boolean result = regexp.match(toMatch);
log.append(" Matched: " + (result ? "YES" : "NO") + "\n");
// Check result, parens, and iterators
if (checkResult(result) && (!shouldMatch || checkParens()))
{
// test match(CharacterIterator, int)
// for every CharacterIterator implementation.
log.append(" Match using StringCharacterIterator\n");
if (!tryMatchUsingCI(new StringCharacterIterator(toMatch)))
return;
log.append(" Match using CharacterArrayCharacterIterator\n");
if (!tryMatchUsingCI(new CharacterArrayCharacterIterator(toMatch.toCharArray(), 0, toMatch.length())))
return;
log.append(" Match using StreamCharacterIterator\n");
if (!tryMatchUsingCI(new StreamCharacterIterator(new StringBufferInputStream(toMatch))))
return;
log.append(" Match using ReaderCharacterIterator\n");
if (!tryMatchUsingCI(new ReaderCharacterIterator(new StringReader(toMatch))))
return;
}
}
// Matcher blew it
catch(Exception e)
{
test.fail(log, "Matcher threw exception: " + e.toString());
e.printStackTrace();
}
// Internal error
catch(Error e)
{
test.fail(log, "Matcher threw fatal error \"" + e.getMessage() + "\"");
e.printStackTrace();
}
}
private boolean checkResult(boolean result)
{
// Write status
if (result == shouldMatch) {
success((shouldMatch ? "Matched" : "Did not match")
+ " \"" + toMatch + "\", as expected:");
return true;
} else {
if (shouldMatch) {
test.fail(log, "Did not match \"" + toMatch + "\", when expected to.");
} else {
test.fail(log, "Matched \"" + toMatch + "\", when not expected to.");
}
return false;
}
}
private boolean checkParens()
{
// Show subexpression registers
if (RETest.showSuccesses)
{
test.showParens(regexp);
}
log.append(" Paren count: " + regexp.getParenCount() + "\n");
if (!assertEquals(log, "Wrong number of parens", parens.length, regexp.getParenCount()))
{
return false;
}
// Check registers against expected contents
for (int p = 0; p < regexp.getParenCount(); p++)
{
log.append(" Paren " + p + ": " + regexp.getParen(p) + "\n");
// Compare expected result with actual
if ("null".equals(parens[p]) && regexp.getParen(p) == null)
{
// Consider "null" in test file equal to null
continue;
}
if (!assertEquals(log, "Wrong register " + p, parens[p], regexp.getParen(p)))
{
return false;
}
}
return true;
}
boolean tryMatchUsingCI(CharacterIterator matchAgainst)
{
try {
boolean result = regexp.match(matchAgainst, 0);
log.append(" Match: " + (result ? "YES" : "NO") + "\n");
return checkResult(result) && (!shouldMatch || checkParens());
}
// Matcher blew it
catch(Exception e)
{
test.fail(log, "Matcher threw exception: " + e.toString());
e.printStackTrace();
}
// Internal error
catch(Error e)
{
test.fail(log, "Matcher threw fatal error \"" + e.getMessage() + "\"");
e.printStackTrace();
}
return false;
}
public boolean assertEquals(StringBuffer log, String message, String expected, String actual)
{
if (expected != null && !expected.equals(actual)
|| actual != null && !actual.equals(expected))
{
test.fail(log, message + " (expected \"" + expected
+ "\", actual \"" + actual + "\")");
return false;
}
return true;
}
public boolean assertEquals(StringBuffer log, String message, int expected, int actual)
{
if (expected != actual) {
test.fail(log, message + " (expected \"" + expected
+ "\", actual \"" + actual + "\")");
return false;
}
return true;
}
/**
* Show a success
* @param s Success story
*/
void success(String s)
{
if (RETest.showSuccesses)
{
test.say("" + RETest.NEW_LINE + "-----------------------" + RETest.NEW_LINE + "");
test.say("Expression #" + (number) + " \"" + pattern + "\" ");
test.say("Success: " + s);
}
}
}
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