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/*
* Copyright (c) 2003 The Visigoth Software Society. All rights
* reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
*
* 3. The end-user documentation included with the redistribution, if
* any, must include the following acknowledgement:
* "This product includes software developed by the
* Visigoth Software Society (http://www.visigoths.org/)."
* Alternately, this acknowledgement may appear in the software itself,
* if and wherever such third-party acknowledgements normally appear.
*
* 4. Neither the name "FreeMarker", "Visigoth", nor any of the names of the
* project contributors may be used to endorse or promote products derived
* from this software without prior written permission. For written
* permission, please contact [email protected].
*
* 5. Products derived from this software may not be called "FreeMarker" or "Visigoth"
* nor may "FreeMarker" or "Visigoth" appear in their names
* without prior written permission of the Visigoth Software Society.
*
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE VISIGOTH SOFTWARE SOCIETY OR
* ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
* USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
* ====================================================================
*
* This software consists of voluntary contributions made by many
* individuals on behalf of the Visigoth Software Society. For more
* information on the Visigoth Software Society, please see
* http://www.visigoths.org/
*/
package freemarker.core;
import java.util.*;
import java.util.regex.*;
import freemarker.template.*;
import freemarker.template.utility.StringUtil;
/**
* This is a first-pass implementation of regular expression support.
* It is subject to change based on community feedback.
* In that sense, use it at your own risk.
* @version $Id: RegexBuiltins.java,v 1.14 2005/06/01 22:39:07 ddekany Exp $
* @author Jonathan Revusky
*/
abstract class RegexBuiltins {
static HashMap patternLookup = new HashMap();
static LinkedList patterns = new LinkedList();
static final int PATTERN_CACHE_SIZE=100;
static Pattern getPattern(String patternString, String flagString) throws TemplateModelException {
int flags = 0;
String patternKey = patternString + (char) 0 + flagString;
Pattern result = (Pattern) patternLookup.get(patternKey);
if (result != null) {
return result;
}
if (flagString == null || flagString.length() == 0) {
try {
result = Pattern.compile(patternString);
} catch (PatternSyntaxException e) {
throw new TemplateModelException(e);
}
}
else {
if (flagString.indexOf('i') >=0) {
flags = flags | Pattern.CASE_INSENSITIVE;
}
if (flagString.indexOf('m') >=0) {
flags = flags | Pattern.MULTILINE;
}
if (flagString.indexOf('c') >=0) {
flags = flags | Pattern.COMMENTS;
}
if (flagString.indexOf('s') >=0) {
flags = flags | Pattern.DOTALL;
}
try {
result = Pattern.compile(patternString, flags);
} catch (PatternSyntaxException e) {
throw new TemplateModelException(e);
}
}
patterns.add(patternKey);
patternLookup.put(patternKey, result);
if (patterns.size() > PATTERN_CACHE_SIZE) {
Object first = patterns.removeFirst();
patterns.remove(first);
}
return result;
}
static class matchesBI extends BuiltIn {
TemplateModel _getAsTemplateModel(Environment env) throws TemplateException {
TemplateModel targetModel = target.getAsTemplateModel(env);
assertNonNull(targetModel, this, env);
if (!(targetModel instanceof TemplateScalarModel)) {
throw invalidTypeException(targetModel, target, env, "string");
}
return new MatcherBuilder((TemplateScalarModel) targetModel);
}
}
static class groupsBI extends BuiltIn {
TemplateModel _getAsTemplateModel(Environment env) throws TemplateException {
TemplateModel targetModel = target.getAsTemplateModel(env);
assertNonNull(targetModel, this, env);
if (targetModel instanceof RegexMatchModel) {
return ((RegexMatchModel) targetModel).getGroups();
}
if (targetModel instanceof RegexMatchModel.Match) {
return ((RegexMatchModel.Match) targetModel).subs;
}
throw invalidTypeException(targetModel, target, env, "a regular expression matcher");
}
}
static class replace_reBI extends BuiltIn {
TemplateModel _getAsTemplateModel(Environment env)
throws TemplateException {
TemplateModel model = target.getAsTemplateModel(env);
if (model instanceof TemplateScalarModel) {
return new ReplaceMethod(((TemplateScalarModel) model).getAsString());
}
throw invalidTypeException(model, target, env, "string");
}
}
static class split_reBI extends BuiltIn {
TemplateModel _getAsTemplateModel(Environment env)
throws TemplateException {
TemplateModel model = target.getAsTemplateModel(env);
if (model instanceof TemplateScalarModel) {
return new SplitMethod(((TemplateScalarModel) model).getAsString());
}
throw invalidTypeException(model, target, env, "string");
}
}
// Represents the match
static class RegexMatchModel
implements TemplateBooleanModel, TemplateCollectionModel, TemplateSequenceModel {
Matcher matcher;
String input;
final boolean matches;
TemplateSequenceModel groups;
private ArrayList data;
RegexMatchModel(Matcher matcher, String input) {
this.matcher = matcher;
this.input = input;
this.matches = matcher.matches();
}
public boolean getAsBoolean() {
return matches;
}
public TemplateModel get(int i) throws TemplateModelException {
if (data == null) initSequence();
return (TemplateModel) data.get(i);
}
public int size() throws TemplateModelException {
if (data == null) initSequence();
return data.size();
}
private void initSequence() throws TemplateModelException {
data = new ArrayList();
TemplateModelIterator it = iterator();
while (it.hasNext()) {
data.add(it.next());
}
}
public TemplateModel getGroups() {
if (groups == null) {
groups = new TemplateSequenceModel() {
public int size() throws TemplateModelException {
try {
return matcher.groupCount() + 1;
}
catch (Exception e) {
throw new TemplateModelException(e);
}
}
public TemplateModel get(int i) throws TemplateModelException {
try {
return new SimpleScalar(matcher.group(i));
}
catch (Exception e) {
throw new TemplateModelException(e);
}
}
};
}
return groups;
}
public TemplateModelIterator iterator() {
matcher.reset();
return new TemplateModelIterator() {
boolean hasFindInfo = matcher.find();
public boolean hasNext() {
return hasFindInfo;
}
public TemplateModel next() throws TemplateModelException {
if (!hasNext()) throw new TemplateModelException("No more matches");
Match result = new Match();
hasFindInfo = matcher.find();
return result;
}
};
}
class Match implements TemplateScalarModel {
String match;
SimpleSequence subs = new SimpleSequence();
Match() {
match = input.substring(matcher.start(), matcher.end());
for (int i=0; i< matcher.groupCount() + 1; i++) {
subs.add(matcher.group(i));
}
}
public String getAsString() {
return match;
}
}
}
static class MatcherBuilder implements TemplateMethodModel {
String matchString;
MatcherBuilder(TemplateScalarModel match) throws TemplateModelException {
this.matchString = match.getAsString();
}
public Object exec(List args) throws TemplateModelException {
int numArgs = args.size();
if (numArgs == 0) {
throw new TemplateModelException("Expecting at least one argument");
}
if (numArgs > 2) {
throw new TemplateModelException("Expecting at most two argumnets");
}
String patternString = (String) args.get(0);
String flagString = (numArgs >1) ? (String) args.get(1) : "";
Pattern pattern = getPattern(patternString, flagString);
Matcher matcher = pattern.matcher(matchString);
return new RegexMatchModel(matcher, matchString);
}
}
static class ReplaceMethod implements TemplateMethodModel {
private String s;
ReplaceMethod(String s) {
this.s = s;
}
public Object exec(List args) throws TemplateModelException {
int numArgs = args.size();
if (numArgs < 2 || numArgs >3 ) {
throw new TemplateModelException(
"?replace(...) needs 2 or 3 arguments.");
}
String first = (String) args.get(0);
String second = (String) args.get(1);
String flags = numArgs >2 ? (String) args.get(2) : "";
boolean caseInsensitive = flags.indexOf('i') >=0;
boolean useRegexp = flags.indexOf('r') >=0;
boolean firstOnly = flags.indexOf('f') >=0;
String result = null;
if (!useRegexp) {
result = StringUtil.replace(s, first, second, caseInsensitive, firstOnly);
} else {
Pattern pattern = getPattern(first, flags);
Matcher matcher = pattern.matcher(s);
result = firstOnly ? matcher.replaceFirst(second) : matcher.replaceAll(second);
}
return new SimpleScalar(result);
}
}
static class SplitMethod implements TemplateMethodModel {
private String s;
SplitMethod(String s) {
this.s = s;
}
public Object exec(List args) throws TemplateModelException {
int numArgs = args.size();
if (numArgs < 1 || numArgs >2 ) {
throw new TemplateModelException(
"?replace(...) needs 1 or 2 arguments.");
}
String splitString = (String) args.get(0);
String flags = numArgs >1 ? (String) args.get(1) : "";
boolean caseInsensitive = flags.indexOf('i') >=0;
boolean useRegexp = flags.indexOf('r') >=0;
String[] result = null;
if (!useRegexp) {
result = StringUtil.split(s, splitString, caseInsensitive);
} else {
Pattern pattern = getPattern(splitString, flags);
result = pattern.split(s);
}
return ObjectWrapper.DEFAULT_WRAPPER.wrap(result);
}
}
}
