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Google XML Pages (GXP) is a templating system used to generate XML/SGML markup (most often HTML).
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/*
* Copyright (C) 2008 Google Inc.
*
* 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.google.gxp.compiler.msgextract;
import com.google.common.base.Function;
import com.google.common.base.Preconditions;
import com.google.common.collect.Lists;
import com.google.gxp.compiler.alerts.AlertSetBuilder;
import com.google.gxp.compiler.alerts.AlertSink;
import com.google.gxp.compiler.alerts.SourcePosition;
import com.google.gxp.compiler.alerts.common.BadNodePlacementError;
import com.google.gxp.compiler.alerts.common.InvalidMessageError;
import com.google.gxp.compiler.base.CollapseExpression;
import com.google.gxp.compiler.base.Concatenation;
import com.google.gxp.compiler.base.ConvertibleToContent;
import com.google.gxp.compiler.base.DefaultingExpressionVisitor;
import com.google.gxp.compiler.base.ExampleExpression;
import com.google.gxp.compiler.base.ExhaustiveExpressionVisitor;
import com.google.gxp.compiler.base.Expression;
import com.google.gxp.compiler.base.ExtractedMessage;
import com.google.gxp.compiler.base.NoMessage;
import com.google.gxp.compiler.base.Node;
import com.google.gxp.compiler.base.OutputElement;
import com.google.gxp.compiler.base.PlaceholderEnd;
import com.google.gxp.compiler.base.PlaceholderNode;
import com.google.gxp.compiler.base.PlaceholderStart;
import com.google.gxp.compiler.base.Root;
import com.google.gxp.compiler.base.StringConstant;
import com.google.gxp.compiler.base.UnexpectedNodeException;
import com.google.gxp.compiler.base.UnextractedMessage;
import com.google.gxp.compiler.i18ncheck.I18nCheckedTree;
import com.google.transconsole.common.messages.InvalidMessageException;
import com.google.transconsole.common.messages.Message;
import com.google.transconsole.common.messages.MessageBuilder;
import java.util.List;
/**
* Replaces message elements and contained Output nodes with validated message
* objects that hold message data as well as a set of DynamicPlaceholder
* children. For example:
*
* 
{
public MessageExtractedTree apply(I18nCheckedTree tree) {
List messages = Lists.newArrayList();
AlertSetBuilder alertSetBuilder = new AlertSetBuilder(tree.getAlerts());
Root root = tree.getRoot().acceptVisitor(new OutsideMessageVisitor(alertSetBuilder, messages));
return new MessageExtractedTree(tree.getSourcePosition(), alertSetBuilder.buildAndClear(),
root, messages);
}
/**
* Visitor used when we are not inside of a {@code } or
* {@code } element.
*/
private static class OutsideMessageVisitor extends ExhaustiveExpressionVisitor {
private final AlertSink alertSink;
private final List messages;
OutsideMessageVisitor(AlertSink alertSink, List messages) {
this.alertSink = Preconditions.checkNotNull(alertSink);
this.messages = Preconditions.checkNotNull(messages);
}
public void addMessages(ExtractedMessage message) {
messages.add(message);
}
@Override
public Expression visitNoMessage(NoMessage noMsg) {
InsideNoMessageVisitor insideNoMsgVisitor =
new InsideNoMessageVisitor(alertSink, noMsg, this);
return noMsg.getSubexpression().acceptVisitor(insideNoMsgVisitor);
}
@Override
public Expression visitUnextractedMessage(UnextractedMessage msg) {
InsideMessageVisitor subVisitor = new InsideMessageVisitor(alertSink, this, msg);
msg.getContent().acceptVisitor(subVisitor);
return subVisitor.getResult();
}
@Override
public Expression visitPlaceholderNode(PlaceholderNode ph) {
alertSink.add(new BadNodePlacementError(ph, null));
return ph.getContent().acceptVisitor(this);
}
@Override
public Expression visitPlaceholderStart(PlaceholderStart value) {
throw new UnexpectedNodeException(value);
}
@Override
public Expression visitPlaceholderEnd(PlaceholderEnd value) {
throw new UnexpectedNodeException(value);
}
}
/**
* Visitor used when we are not inside of a {@code } or
* {@code } element.
*/
private static class InsideNoMessageVisitor extends ExhaustiveExpressionVisitor {
private final AlertSink alertSink;
private final NoMessage rootNoMsg;
private final OutsideMessageVisitor outsideMessageVisitor;
InsideNoMessageVisitor(AlertSink alertSink,
NoMessage rootNoMsg,
OutsideMessageVisitor outsideMessageVisitor) {
this.alertSink = Preconditions.checkNotNull(alertSink);
this.rootNoMsg = Preconditions.checkNotNull(rootNoMsg);
this.outsideMessageVisitor = Preconditions.checkNotNull(outsideMessageVisitor);
}
@Override
public Expression visitUnextractedMessage(UnextractedMessage msg) {
alertSink.add(new BadNodePlacementError(msg, rootNoMsg));
return msg.acceptVisitor(outsideMessageVisitor);
}
@Override
public Expression visitNoMessage(NoMessage noMsg) {
alertSink.add(new BadNodePlacementError(noMsg, rootNoMsg));
return noMsg.getSubexpression().acceptVisitor(this);
}
@Override
public Expression visitPlaceholderNode(PlaceholderNode ph) {
alertSink.add(new BadNodePlacementError(ph, rootNoMsg));
return ph.getContent().acceptVisitor(this);
}
@Override
public Expression visitPlaceholderStart(PlaceholderStart value) {
throw new UnexpectedNodeException(value);
}
@Override
public Expression visitPlaceholderEnd(PlaceholderEnd value) {
throw new UnexpectedNodeException(value);
}
}
/**
* Visitor used when we are inside of a {@code } element.
* The calling protocol is to create the InsideMessageVisitor, have it visit
* the content of an {@code UnextractedMessage} (which will cause to to
* accumulate all of the information it needs) and then call the
* {@code getResult} method, which will return an {@code ExtractedMessage},
* or a stand-in if there was an error.
*/
private static class InsideMessageVisitor extends DefaultingExpressionVisitor {
private final AlertSink alertSink;
private final OutsideMessageVisitor outsideMessageVisitor;
private final UnextractedMessage msg;
// Mutable state:
private final MessageBuilder tcMessageBuilder = new MessageBuilder();
private final List parameters = Lists.newArrayList();
private boolean invalid = false;
/**
* {@link com.google.i18n.Message} only supports the pattern "%[1-9%]" when
* looking for dynamic placeholders, so only 9 dynamic placeholders are
* allowed.
*/
private static final int MAX_DYNAMIC_PLACEHOLDER_COUNT = 9;
InsideMessageVisitor(AlertSink alertSink,
OutsideMessageVisitor outsideMessageVisitor,
UnextractedMessage msg) {
this.alertSink = Preconditions.checkNotNull(alertSink);
this.outsideMessageVisitor = Preconditions.checkNotNull(outsideMessageVisitor);
this.msg = Preconditions.checkNotNull(msg);
// Populate the tcMessageBuilder with a content-type
tcMessageBuilder.setContentType(msg.getSchema().getCanonicalContentType());
// Populate tcMessageBuilder with attributes from msg.
// - The meaning is used to compute the msg id.
if (null != msg.getMeaning()) {
tcMessageBuilder.setMeaning(msg.getMeaning());
}
// mark this message as hidden if indicated
if (msg.isHidden()) {
tcMessageBuilder.setHidden(true);
}
// - Comments are notes for translators
if (null != msg.getComment()) {
tcMessageBuilder.setDescription(msg.getComment());
}
// - Include the source gxp file so that l10n experts for other projects
// can avoid clobbering this project's translated strings.
SourcePosition source = msg.getSourcePosition();
if (source != null) {
tcMessageBuilder.addSource(source.getSource().toRelativeFilename()
+ ": L" + source.getLine()
// For backwards compatibility with the old
// compiler, report a 0-based column number.
+ ", C" + (source.getColumn() - 1));
}
}
Expression getResult() {
if (!invalid) {
try {
Message message = tcMessageBuilder.createMessage();
ExtractedMessage emsg =
new ExtractedMessage(msg, msg.getSchema(), msg.getName(), message, parameters);
outsideMessageVisitor.addMessages(emsg);
return emsg;
} catch (InvalidMessageException imx) {
recordInvalidMessageException(msg, imx);
}
}
if (!invalid) {
throw new AssertionError("Attempting to create stand-in when message is valid!");
}
// TODO(laurence): create a better stand-in
return new StringConstant(msg, msg.getSchema(), "");
}
private void recordInvalidMessageException(Node node, InvalidMessageException imx) {
alertSink.add(new InvalidMessageError(node.getSourcePosition(), imx));
invalid = true;
}
@Override
public Void visitStringConstant(StringConstant value) {
tcMessageBuilder.appendText(value.evaluate());
return null;
}
@Override
public Void visitConcatenation(Concatenation value) {
for (Expression subExpression : value.getValues()) {
subExpression.acceptVisitor(this);
}
return null;
}
@Override
public Void visitConvertibleToContent(ConvertibleToContent value) {
value.getSubexpression().acceptVisitor(this);
return null;
}
@Override
public Void visitExampleExpression(ExampleExpression value) {
return value.getSubexpression().acceptVisitor(this);
}
@Override
protected Void defaultVisitExpression(Expression node) {
alertSink.add(new BadNodePlacementError(node, msg));
return null;
}
@Override
public Void visitPlaceholderNode(PlaceholderNode ph) {
StringBuilder sb = new StringBuilder();
for (Expression subExpression : ph.getContent().separate()) {
subExpression =
subExpression.acceptVisitor(outsideMessageVisitor);
if (subExpression.hasStaticString()) {
String s = Preconditions.checkNotNull(subExpression.getStaticString(alertSink,
null));
sb.append(s.replace("%", "%%"));
} else {
int index;
for (index = 0; index < parameters.size(); index++) {
if (parameters.get(index).alwaysEquals(subExpression)) {
break;
}
}
// Placeholders parameters start at 1.
int id = index + 1;
if (id > MAX_DYNAMIC_PLACEHOLDER_COUNT) {
alertSink.add(new TooManyDynamicPlaceholdersError(subExpression));
} else {
if (index == parameters.size()) {
parameters.add(subExpression);
}
sb.append("%");
sb.append(String.valueOf(id));
}
}
}
try {
tcMessageBuilder.appendPlaceholder(sb.toString(),
ph.getName().toUpperCase(),
ph.getExample());
} catch (InvalidMessageException imx) {
recordInvalidMessageException(ph, imx);
}
return null;
}
@Override
public Void visitOutputElement(OutputElement value) {
throw new UnexpectedNodeException(value);
}
@Override
public Void visitCollapseExpression(CollapseExpression value) {
throw new UnexpectedNodeException(value);
}
@Override
public Void visitExtractedMessage(ExtractedMessage value) {
throw new UnexpectedNodeException(value);
}
@Override
public Void visitPlaceholderStart(PlaceholderStart value) {
throw new UnexpectedNodeException(value);
}
@Override
public Void visitPlaceholderEnd(PlaceholderEnd value) {
throw new UnexpectedNodeException(value);
}
}
}