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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.js;
import static com.google.gxp.compiler.base.OutputLanguage.JAVASCRIPT;
import com.google.common.base.CharEscapers;
import com.google.common.base.Function;
import com.google.common.base.Joiner;
import com.google.common.base.Preconditions;
import com.google.common.collect.ImmutableSet;
import com.google.common.collect.Iterables;
import com.google.common.collect.Lists;
import com.google.common.collect.Sets;
import com.google.gxp.compiler.alerts.AlertSink;
import com.google.gxp.compiler.alerts.SourcePosition;
import com.google.gxp.compiler.alerts.common.NothingToCompileError;
import com.google.gxp.compiler.base.AbbrExpression;
import com.google.gxp.compiler.base.AttrBundleParam;
import com.google.gxp.compiler.base.AttrBundleReference;
import com.google.gxp.compiler.base.BooleanConstant;
import com.google.gxp.compiler.base.BoundCall;
import com.google.gxp.compiler.base.Call;
import com.google.gxp.compiler.base.Callable;
import com.google.gxp.compiler.base.CallableVisitor;
import com.google.gxp.compiler.base.CallVisitor;
import com.google.gxp.compiler.base.Concatenation;
import com.google.gxp.compiler.base.Conditional;
import com.google.gxp.compiler.base.ConstructedConstant;
import com.google.gxp.compiler.base.ConvertibleToContent;
import com.google.gxp.compiler.base.DefaultingExpressionVisitor;
import com.google.gxp.compiler.base.EscapeExpression;
import com.google.gxp.compiler.base.ExampleExpression;
import com.google.gxp.compiler.base.ExceptionExpression;
import com.google.gxp.compiler.base.Expression;
import com.google.gxp.compiler.base.ExpressionVisitor;
import com.google.gxp.compiler.base.ExtractedMessage;
import com.google.gxp.compiler.base.FormalParameter;
import com.google.gxp.compiler.base.FormalTypeParameter;
import com.google.gxp.compiler.base.Implementable;
import com.google.gxp.compiler.base.InstanceCallable;
import com.google.gxp.compiler.base.Interface;
import com.google.gxp.compiler.base.IsXmlExpression;
import com.google.gxp.compiler.base.LoopExpression;
import com.google.gxp.compiler.base.NativeExpression;
import com.google.gxp.compiler.base.NullRoot;
import com.google.gxp.compiler.base.ObjectConstant;
import com.google.gxp.compiler.base.Parameter;
import com.google.gxp.compiler.base.Root;
import com.google.gxp.compiler.base.RootVisitor;
import com.google.gxp.compiler.base.StringConstant;
import com.google.gxp.compiler.base.Template;
import com.google.gxp.compiler.base.TemplateName;
import com.google.gxp.compiler.base.UnboundCall;
import com.google.gxp.compiler.base.UnexpectedNodeException;
import com.google.gxp.compiler.base.ValidatedCall;
import com.google.gxp.compiler.codegen.BracesCodeGenerator;
import com.google.gxp.compiler.msgextract.MessageExtractedTree;
import com.google.gxp.compiler.reparent.Attribute;
import com.google.gxp.compiler.schema.AttributeValidator;
import com.google.gxp.compiler.schema.ContentFamilyVisitor;
import com.google.gxp.compiler.schema.Schema;
import com.google.transconsole.common.messages.MessageFragment;
import com.google.transconsole.common.messages.Placeholder;
import java.util.*;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
/**
* {@code CodeGenerator} which generates JavaScript code.
*/
public class JavaScriptCodeGenerator extends BracesCodeGenerator {
public JavaScriptCodeGenerator(MessageExtractedTree tree) {
super(tree);
}
public void generateCode(final Appendable appendable, final AlertSink alertSink) {
alertSink.addAll(tree.getAlerts());
root.acceptVisitor(new RootVisitor() {
public Void visitInterface(Interface iface) {
// TODO: what should we even do with interfaces in javascript?
// should we add an alert?
return null;
}
public Void visitNullRoot(NullRoot nullRoot) {
alertSink.add(new NothingToCompileError(nullRoot.getSourcePosition()));
return null;
}
public Void visitTemplate(Template template) {
validateFormalTypeParameters(alertSink, template.getFormalTypeParameters());
createTemplateWorker(appendable, alertSink, template).run();
return null;
}
});
}
private void validateFormalTypeParameters(AlertSink alertSink,
List formalTypeParameters) {
for (FormalTypeParameter formalTypeParameter : formalTypeParameters) {
JAVASCRIPT.validateName(alertSink, formalTypeParameter, formalTypeParameter.getName());
}
}
private TemplateWorker createTemplateWorker(Appendable appendable,
AlertSink alertSink,
Template template) {
return new TemplateWorker(appendable, alertSink, template);
}
private static class TemplateWorker extends BracesCodeGenerator.Worker {
private final Template template;
private int varCounter = 0;
public TemplateWorker(Appendable appendable, AlertSink alertSink, Template template) {
super(appendable, alertSink);
this.template = Preconditions.checkNotNull(template);
}
public TemplateWorker createSubWorker(Appendable newAppendable) {
return new TemplateWorker(newAppendable, alertSink, template);
}
public void run() {
for (Parameter param : template.getAllParameters()) {
JAVASCRIPT.validateName(alertSink, param, param.getPrimaryName());
}
appendHeader(template);
appendLine();
formatLine("goog.provide('%s');", getClassName(template.getName()));
appendLine();
appendImports(template);
appendLine();
appendConstructor();
appendLine();
appendWriteMethod();
appendLine();
appendWriteWithObjMethod(false);
appendLine();
appendGetGxpClosureMethod(false);
appendLine();
appendStaticWriteMethod();
appendLine();
appendWriteWithObjMethod(true);
appendLine();
appendGetGxpClosureMethod(true);
appendGetDefaultMethods();
appendConstructorMethods();
appendLine();
appendFooter();
}
private String getWriteMethodSignature(boolean isStatic) {
Iterable params = isStatic
? template.getAllParameters()
: template.getParameters();
StringBuilder sb = new StringBuilder();
sb.append(getClassName(template.getName()));
if (!isStatic) {
sb.append(".prototype");
}
sb.append(".write = function(");
COMMA_JOINER.appendTo(sb, Iterables.concat(ImmutableSet.of(GXP_SIG),
Iterables.transform(params, parameterToName)));
sb.append(") {");
return sb.toString();
}
private String getGetGxpClosureMethodSignature(boolean isStatic) {
Iterable params = isStatic
? template.getAllParameters()
: template.getParameters();
StringBuilder sb = new StringBuilder();
sb.append(getClassName(template.getName()));
if (!isStatic) {
sb.append(".prototype");
}
sb.append(".getGxpClosure = function(");
COMMA_JOINER.appendTo(sb, Iterables.transform(params, parameterToName));
sb.append(") {");
return sb.toString();
}
private void appendImports(Root root) {
for (String imp : root.getSchema().getJavaScriptImports()) {
formatLine("goog.require('%s');", imp);
}
}
private void appendConstructor() {
Iterable params = template.getConstructor().getParameters();
appendLine("/**");
appendLine(" * @constructor");
appendLine(" */");
StringBuilder sb = new StringBuilder();
sb.append(getClassName(template.getName()));
sb.append(" = function(");
COMMA_JOINER.appendTo(sb, Iterables.transform(params, parameterToName));
sb.append(") {");
appendLine(sb);
for (Parameter param : params) {
formatLine("this.%s = %s;", param.getPrimaryName(), param.getPrimaryName());
}
appendLine("};");
}
private void appendWriteMethod() {
Iterable ctorParams = template.getConstructor().getParameters();
Iterable params = template.getParameters();
// varargs + generics = spurious unchecked warning. OK to suppress.
@SuppressWarnings("unchecked")
Iterable methodParameters = Iterables.concat(
ImmutableSet.of(GXP_SIG),
Iterables.transform(ctorParams, parameterToMemberName),
Iterables.transform(params, parameterToName));
appendLine(getWriteMethodSignature(false));
StringBuilder sb = new StringBuilder();
sb.append(getClassName(template.getName()));
sb.append(".write(");
COMMA_JOINER.appendTo(sb, methodParameters);
sb.append(");");
appendLine(sb);
appendLine("};");
}
private void appendGetGxpClosureMethod(boolean isStatic) {
Iterable params = isStatic
? template.getAllParameters()
: template.getParameters();
appendLine(getGetGxpClosureMethodSignature(isStatic));
if (!isStatic) {
for (Parameter param : template.getConstructor().getParameters()) {
formatLine("var %s = this.%s;", param.getPrimaryName(), param.getPrimaryName());
}
}
formatLine("return new %s(function(%s) {",
template.getSchema().getJavaScriptType(), GXP_SIG);
StringBuilder sb = new StringBuilder();
sb.append(getClassName(template.getName()));
sb.append(".write(");
COMMA_JOINER.appendTo(sb, Iterables.concat(ImmutableSet.of(GXP_SIG),
Iterables.transform(template.getAllParameters(),
parameterToName)));
sb.append(");");
appendLine(sb);
formatLine("return %s;", GXP_OUT_VAR);
appendLine("});");
appendLine("};");
}
private void appendStaticWriteMethod() {
appendLine(getWriteMethodSignature(true));
template.getContent().acceptVisitor(statementVisitor);
appendLine("};");
}
private void extractMapParameters(boolean isStatic) {
String baseName = isStatic ? getClassName(template.getName()) : "this";
Iterable params = isStatic
? template.getAllParameters()
: template.getParameters();
// Create some stub declarations of all parameters, to tell jscompiler
// that it's ok if these parameters are not defined anywhere.
for (Parameter param : params) {
formatLine(
"/** @type {*} */ %s.%s;", GXP_PARAM_VAR, param.getPrimaryName());
}
for (Parameter param : params) {
if (param.getDefaultValue() != null) {
formatLine(param.getSourcePosition(),
"var %s = %s.%s || %s.%s();",
param.getPrimaryName(),
GXP_PARAM_VAR, param.getPrimaryName(),
baseName, getDefaultMethodName(param));
} else {
formatLine(param.getSourcePosition(), "var %s = %s.%s;",
param.getPrimaryName(), GXP_PARAM_VAR, param.getPrimaryName());
}
}
}
private void appendWriteWithObjMethod(boolean isStatic) {
StringBuilder sb = new StringBuilder();
sb.append(getClassName(template.getName()));
if (!isStatic) {
sb.append(".prototype");
}
sb.append(".writeWithObj = function(");
sb.append(GXP_PARAM_SIG);
sb.append(") {");
appendLine(sb);
extractMapParameters(isStatic);
sb = new StringBuilder(getClassName(template.getName()));
sb.append(".write(");
if (isStatic) {
COMMA_JOINER.appendTo(sb, Iterables.concat(ImmutableSet.of(GXP_SIG),
Iterables.transform(template.getAllParameters(),
parameterToName)));
} else {
// varargs + generics = spurious unchecked warning. OK to suppress.
@SuppressWarnings("unchecked")
Iterable methodParameters = Iterables.concat(
ImmutableSet.of(GXP_SIG),
Iterables.transform(template.getConstructor().getParameters(), parameterToMemberName),
Iterables.transform(template.getParameters(), parameterToName));
COMMA_JOINER.appendTo(sb, methodParameters);
}
sb.append(");");
appendLine(sb);
appendLine("};");
}
private void appendGetDefaultMethods() {
for (Parameter param : template.getAllParameters()) {
Expression defaultValue = param.getDefaultValue();
if (defaultValue != null) {
appendLine();
formatLine(param.getDefaultValue().getSourcePosition(),
"%s.GXP_DEFAULT$%s = %s;",
getClassName(template.getName()),
param.getPrimaryName(),
getJavaScriptExpression(param.getDefaultValue()));
appendLine();
String methodName = getDefaultMethodName(param);
formatLine("%s.%s = function() {", getClassName(template.getName()), methodName);
formatLine("return %s.GXP_DEFAULT$%s;",
getClassName(template.getName()), param.getPrimaryName());
appendLine("};");
}
}
// only non constuctor parameters get getDefault methods on an instantiated template
for (Parameter param : template.getParameters()) {
if (param.getDefaultValue() != null) {
String methodName = getDefaultMethodName(param);
appendLine();
formatLine("%s.prototype.%s = function() {",
getClassName(template.getName()), methodName);
formatLine("return %s.%s();", getClassName(template.getName()), methodName);
appendLine("};");
}
}
}
private void appendConstructorMethods() {
for (Parameter param : template.getAllParameters()) {
if (param.getConstructor() != null) {
String methodName = getConstructorMethodName(param);
appendLine();
formatLine("%s.%s = function(%s) {",
getClassName(template.getName()), methodName, param.getPrimaryName());
formatLine(param.getSourcePosition(), "return %s;",
param.getConstructor().acceptVisitor(toExpressionVisitor));
appendLine("};");
}
}
// only non constuctor parameters get construct methods on an instantiated template
for (Parameter param : template.getParameters()) {
if (param.getConstructor() != null) {
String methodName = getConstructorMethodName(param);
appendLine();
formatLine("%s.prototype.%s = function(%s) {",
getClassName(template.getName()), methodName, param.getPrimaryName());
formatLine("return %s.%s(%s);",
getClassName(template.getName()), methodName, param.getPrimaryName());
appendLine("};");
}
}
}
private static final String GXP_OUT_VAR = "gxp$out";
private static final String GXP_CONTEXT_VAR = "gxp_context";
private static final String GXP_PARAM_VAR = "gxp_param_map";
private static final String GXP_SIG = COMMA_JOINER.join(GXP_OUT_VAR, GXP_CONTEXT_VAR);
private static final String GXP_PARAM_SIG = COMMA_JOINER.join(GXP_OUT_VAR, GXP_CONTEXT_VAR,
GXP_PARAM_VAR);
/**
* Creates a unique (to this Worker) variable name.
*
* @param token string which is included in variable name. This can be used
* to (slightly) increase readability of the generated code.
*/
protected final String createVarName(String token) {
return "gxp$" + token + "$" + varCounter++;
}
private String getClassName(TemplateName name) {
return name.toString();
}
private String getWriteMethodName(Schema schema) {
String name = schema.getName();
return "gxp$write" + Character.toUpperCase(name.charAt(0)) + name.substring(1);
}
private Function parameterToName =
new Function() {
public String apply(Parameter param) {
return param.getPrimaryName();
}
};
private Function parameterToMemberName =
new Function() {
public String apply(Parameter param) {
return "this." + param.getPrimaryName();
}
};
////////////////////////////////////////////////////////////////////////////////
// Utility Functions used by Visitors
////////////////////////////////////////////////////////////////////////////////
protected void writeExpression(SourcePosition pos, String expr) {
formatLine(pos, "%s.append(%s);", GXP_OUT_VAR, expr);
}
// TODO(harryh): find out what this should be
private static final int MAX_JAVASCRIPT_STRING_LENGTH = 65534;
protected void writeString(SourcePosition pos, String s) {
int length = s.length();
if (length != 0) {
int curPos = 0;
while (length - curPos > MAX_JAVASCRIPT_STRING_LENGTH) {
writeExpression(pos, JAVASCRIPT.toStringLiteral(
s.substring(curPos, curPos + MAX_JAVASCRIPT_STRING_LENGTH)));
curPos += MAX_JAVASCRIPT_STRING_LENGTH;
}
writeExpression(pos, JAVASCRIPT.toStringLiteral(s.substring(curPos, length)));
}
}
protected final Deque instantiatedGxps = new ArrayDeque();
/**
* @return either the fully qualified static name of the GXP if we're
* doing a static call, or the variable name of the instantiated GXP
* if we're doing an instance call.
*/
protected String getCalleeName(Callable callee) {
return callee.acceptCallableVisitor(new CallableVisitor() {
public String visitCallable(Callable callable) {
return getClassName(callable.getName());
}
public String visitInstanceCallable(InstanceCallable callable) {
return instantiatedGxps.peek();
}
});
}
private List getCallArguments(Callable callee, Map callerAttrs) {
List fParams = Lists.newArrayList();
String calleeName = getCalleeName(callee);
for (FormalParameter parameter : callee.getParameters()) {
String paramName = parameter.getPrimaryName();
if (!Implementable.INSTANCE_PARAM_NAME.equals(paramName)) {
Attribute value = callerAttrs.get(paramName);
String defaultFetchString = (parameter.getType().getDefaultValue() == null)
? calleeName + "." + getDefaultMethodName(parameter) + "()"
: getJavaScriptExpression(parameter.getType().getDefaultValue());
if (value == null) {
fParams.add(defaultFetchString);
} else if (value.getCondition() != null) {
String s = "(" +
getJavaScriptExpression(value.getCondition()) +
" ? " + getJavaScriptExpression(value.getValue()) + " : " +
defaultFetchString + ")";
fParams.add(s);
} else {
fParams.add(getJavaScriptExpression(value.getValue()));
}
}
}
return fParams;
}
////////////////////////////////////////////////////////////////////////////////
// Visitors
////////////////////////////////////////////////////////////////////////////////
private final StatementVisitor statementVisitor = getStatementVisitor();
private final ExpressionVisitor toExpressionVisitor =
new ToExpressionVisitor();
private final ExpressionVisitor toEscapableExpressionVisitor =
getToEscapableExpressionVisitor();
protected StatementVisitor getStatementVisitor() {
return new StatementVisitor();
}
protected ToEscapableExpressionVisitor getToEscapableExpressionVisitor() {
return new ToEscapableExpressionVisitor();
}
/**
* A visitor that outputs statements to {@code out} based on the nodes that
* it visits.
*/
protected class StatementVisitor extends DefaultingExpressionVisitor
implements CallVisitor {
@Override
public Void defaultVisitExpression(Expression node) {
throw new UnexpectedNodeException(node);
}
////////////////////////////////////////////////////////////////////////////////
// Expression Visitors
////////////////////////////////////////////////////////////////////////////////
@Override
public Void visitAbbrExpression(AbbrExpression abbr) {
appendLine("(function() {");
formatLine(abbr.getSourcePosition(),
"var %s = %s;",
JAVASCRIPT.validateName(alertSink, abbr, abbr.getName()),
getJavaScriptExpression(abbr.getValue()));
abbr.getContent().acceptVisitor(this);
appendLine("})();");
return null;
}
@Override
public Void visitConcatenation(Concatenation value) {
for (Expression subValue : value.getValues()) {
subValue.acceptVisitor(this);
}
return null;
}
@Override
public Void visitConditional(Conditional value) {
Iterator clauses = value.getClauses().iterator();
if (clauses.hasNext()) {
appendIf("if (", clauses.next());
while (clauses.hasNext()) {
appendIf("} else if (", clauses.next());
}
Expression elseExpression = value.getElseExpression();
if (!elseExpression.alwaysEmpty()) {
appendLine("} else {");
elseExpression.acceptVisitor(this);
}
appendLine("}");
} else {
throw new AssertionError("No clauses in Conditional!");
}
return null;
}
private void appendIf(String prefix, Conditional.Clause clause) {
Expression predicate = clause.getPredicate();
appendLine(predicate.getSourcePosition(),
prefix + getJavaScriptExpression(predicate) + ") {");
clause.getExpression().acceptVisitor(this);
}
@Override
public Void visitConvertibleToContent(ConvertibleToContent value) {
value.getSubexpression().acceptVisitor(this);
return null;
}
@Override
public Void visitEscapeExpression(EscapeExpression value) {
formatLine(value.getSourcePosition(), "%s.%s(%s);",
getEscapableExpression(value.getSubexpression()),
getWriteMethodName(value.getSchema()), GXP_SIG);
return null;
}
@Override
public Void visitExampleExpression(ExampleExpression value) {
return value.getSubexpression().acceptVisitor(this);
}
@Override
public Void visitExceptionExpression(ExceptionExpression value) {
String excClass;
switch (value.getKind()) {
case NOT_SUPPORTED_IN_SGML_MODE:
excClass = "Error";
break;
default:
throw new AssertionError("Unsupported ExceptionExpression.Kind: " + value.getKind());
}
appendLine(value.getSourcePosition(),
"throw new " + excClass + "("
+ JAVASCRIPT.toStringLiteral(value.getMessage()) + ");");
return null;
}
public String toLowerCamelCase(String s) {
StringBuilder sb = new StringBuilder();
boolean first = true;
for (String part : s.split("_")) {
part = part.toLowerCase();
if (first) {
first = false;
} else {
part = Character.toUpperCase(part.charAt(0)) + part.substring(1);
}
sb.append(part);
}
return sb.toString();
}
@Override
public Void visitExtractedMessage(ExtractedMessage msg) {
String paramVar = createVarName("params");
if (!msg.getParameters().isEmpty()) {
StringBuilder sb = new StringBuilder("var ");
sb.append(paramVar);
sb.append(" = [");
COMMA_JOINER.appendTo(sb, Iterables.transform(msg.getParameters(),
expressionToEscapedString));
sb.append("];");
appendLine(sb);
}
Set placeholders = Sets.newHashSet();
String msgVar = "MSG_EXTERNAL_" + msg.getTcMessage().getId();
StringBuilder sb = new StringBuilder("var ");
sb.append(msgVar);
sb.append(" = goog.getMsg(\"");
for (MessageFragment fragment : msg.getTcMessage()) {
if (fragment instanceof Placeholder) {
placeholders.add((Placeholder) fragment);
sb.append("{$");
sb.append(toLowerCamelCase(fragment.getPresentation()));
sb.append("}");
} else {
sb.append(CharEscapers.javascriptEscaper().escape(fragment.getPresentation()));
}
}
sb.append('"');
Iterator phIter = placeholders.iterator();
if (phIter.hasNext()) {
sb.append(", {");
appendLine(msg.getSourcePosition(), sb);
sb = new StringBuilder();
while(phIter.hasNext()) {
Placeholder placeholder = phIter.next();
sb.append(JAVASCRIPT.toStringLiteral(toLowerCamelCase(placeholder.getPresentation())));
sb.append(": ");
sb.append(evalPlaceholder(placeholder.getOriginal(), paramVar));
if (phIter.hasNext()) {
sb.append(",");
}
appendLine(msg.getSourcePosition(), sb);
sb = new StringBuilder();
}
sb.append("}");
}
sb.append(");");
appendLine(msg.getSourcePosition(), sb);
writeExpression(msg.getSourcePosition(), msgVar);
return null;
}
private final Pattern PARAM_PATTERN = Pattern.compile("%([1-9%])");
private String evalPlaceholder(String original, String paramVar) {
List parts = Lists.newArrayList();
Matcher m = PARAM_PATTERN.matcher(original);
int cur = 0;
while (m.find(cur)) {
if (cur != m.start()) {
parts.add(JAVASCRIPT.toStringLiteral(original.substring(cur, m.start())));
}
char ch = original.charAt(m.start() + 1);
if (m.group(1).equals("%")) {
parts.add("'%'");
} else {
parts.add(paramVar + "[" + (Integer.parseInt(m.group(1)) - 1) + "]");
}
cur = m.end();
}
if (cur != original.length()) {
parts.add(JAVASCRIPT.toStringLiteral(original.substring(cur, original.length())));
}
return Joiner.on("+").join(parts);
}
@Override
public Void visitLoopExpression(LoopExpression loop) {
// JS Loops require an iterable
if (loop.getIterable() == null) {
// this is kind of wonky, but even though we don't support JS Loops with
// iterators, if they do provide one we still do expression validation. It
// makes our unit tests a bit cleaner, and there's no real harm
if (loop.getIterator() != null && loop.getIterator().canEvaluateAs(JAVASCRIPT)) {
getJavaScriptExpression(loop.getIterator());
}
alertSink.add(new LoopRequiresIterableInJavaScriptError(loop));
return null;
}
String keyVar = (loop.getKey() == null)
? createVarName("key")
: JAVASCRIPT.validateName(alertSink, loop, loop.getKey());
formatLine(loop.getSourcePosition(),
"goog.gxp.base.forEach(%s, function(%s, %s, gxp$isFirst) {",
getJavaScriptExpression(loop.getIterable()), keyVar,
JAVASCRIPT.validateName(alertSink, loop, loop.getVar()));
if (!loop.getDelimiter().alwaysEmpty()) {
appendLine("if (!gxp$isFirst) {");
loop.getDelimiter().acceptVisitor(this);
appendLine("}");
}
loop.getSubexpression().acceptVisitor(this);
appendLine("});");
return null;
}
@Override
public Void visitStringConstant(StringConstant value) {
if (value.getSchema() == null) {
throw new AssertionError();
}
writeString(value.getSourcePosition(), value.evaluate());
return null;
}
////////////////////////////////////////////////////////////////////////////////
// Call Visitors
////////////////////////////////////////////////////////////////////////////////
@Override
public Void visitCall(Call value) {
return value.acceptCallVisitor(this);
}
public Void visitUnboundCall(UnboundCall call) {
throw new UnexpectedNodeException(call);
}
public Void visitBoundCall(BoundCall call) {
throw new UnexpectedNodeException(call);
}
public Void visitValidatedCall(final ValidatedCall call) {
final Callable callee = call.getCallee();
final Map params = call.getAttributes();
final StringBuilder sb = new StringBuilder();
boolean isInstance = callee.acceptCallableVisitor(new CallableVisitor() {
public Boolean visitCallable(Callable callable) {
return false;
}
public Boolean visitInstanceCallable(InstanceCallable callable) {
instantiatedGxps.push(createVarName("inst"));
Attribute thisAttr = params.get(Implementable.INSTANCE_PARAM_NAME);
appendLine("{");
if (thisAttr != null) {
formatLine(call.getSourcePosition(), "var %s = %s;",
instantiatedGxps.peek(),
thisAttr.getValue().acceptVisitor(toExpressionVisitor));
}
return true;
}
});
sb.append(getCalleeName(callee));
sb.append(".write(");
sb.append(GXP_SIG);
for (String param : getCallArguments(callee, params)) {
sb.append(", ");
sb.append(param);
}
sb.append(");");
appendLine(call.getSourcePosition(), sb);
if (isInstance) {
instantiatedGxps.pop();
appendLine("}");
}
return null;
}
}
protected String getJavaScriptExpression(Expression value) {
return value.acceptVisitor(toExpressionVisitor);
}
protected String getEscapedString(Expression value) {
StringBuilder sb = new StringBuilder();
sb.append(getJavaScriptExpression(value));
sb.append(".");
sb.append(getWriteMethodName(value.getSchema()));
sb.append("(new goog.string.StringBuffer(), ");
sb.append(GXP_CONTEXT_VAR);
sb.append(").toString()");
return sb.toString();
}
protected Function expressionToEscapedString =
new Function() {
public String apply(Expression value) {
return getEscapedString(value);
}
};
private String getEscapableExpression(Expression value) {
return value.acceptVisitor(toEscapableExpressionVisitor);
}
/**
* Converts an Expression into a JavaScript expression that evaluates to
* a String containing that Expression's value. This differs from
* ToExpressionVisitor in that ToExpressionVisitor will sometimes return
* closure types (eg: HtmlClosure), rather than Strings. Note that this is
* only ever called on Expressions that are the child of an
* EscapeExpression, so only types that can appear as the child of an
* EscapeExpression need to be handled.
*/
protected class ToEscapableExpressionVisitor
extends DefaultingExpressionVisitor
implements CallVisitor {
@Override
public String defaultVisitExpression(Expression value) {
throw new UnexpectedNodeException(value);
}
////////////////////////////////////////////////////////////////////////////////
// Expression Visitors
////////////////////////////////////////////////////////////////////////////////
@Override
public String visitAttrBundleReference(AttrBundleReference value) {
return value.getName();
}
@Override
public String visitEscapeExpression(EscapeExpression value) {
StringBuilder sb = new StringBuilder();
sb.append(getEscapableExpression(value.getSubexpression()));
sb.append(".");
sb.append(getWriteMethodName(value.getSchema()));
sb.append("(new goog.string.StringBuffer(), ");
sb.append(GXP_CONTEXT_VAR);
sb.append(").toString()");
return sb.toString();
}
@Override
public String visitExtractedMessage(ExtractedMessage msg) {
return getEscapedString(msg);
}
@Override
public String visitNativeExpression(NativeExpression value) {
StringBuilder sb = new StringBuilder();
sb.append('(');
sb.append(JAVASCRIPT.validateExpression(alertSink, value));
sb.append(')');
return sb.toString();
}
////////////////////////////////////////////////////////////////////////////////
// Call Visitors
////////////////////////////////////////////////////////////////////////////////
@Override
public String visitCall(Call call) {
return call.acceptCallVisitor(this);
}
@Override
public String visitBoundCall(BoundCall call) {
throw new UnexpectedNodeException(call);
}
@Override
public String visitUnboundCall(UnboundCall call) {
throw new UnexpectedNodeException(call);
}
@Override
public String visitValidatedCall(ValidatedCall call) {
StringBuilder sb = new StringBuilder(GXP_CONTEXT_VAR);
sb.append(".getString(");
sb.append(getJavaScriptExpression(call));
sb.append(".");
sb.append(getWriteMethodName(call.getSchema()));
sb.append(")");
return sb.toString();
}
}
private class ToExpressionVisitor
extends DefaultingExpressionVisitor
implements CallVisitor {
@Override
public String defaultVisitExpression(Expression value) {
throw new UnexpectedNodeException(value);
}
////////////////////////////////////////////////////////////////////////////////
// Expression Visitors
////////////////////////////////////////////////////////////////////////////////
@Override
public String visitAbbrExpression(AbbrExpression value) {
return toAnonymousClosure(value);
}
@Override
public String visitAttrBundleParam(AttrBundleParam bundle) {
// optimization where a single bundle is being passed without
// restrictions to another. Just pass the bundle along without
// using a GxpAttrBundle.Builder
if (bundle.getIncludeAttrs().isEmpty() && bundle.getAttrs().isEmpty()
&& bundle.getSubBundles().size() == 1) {
return bundle.getSubBundles().get(0);
}
StringBuilder sb = new StringBuilder("new goog.gxp.base.GxpAttrBundle.Builder(");
sb.append('"');
sb.append(getWriteMethodName(bundle.getSchema()));
sb.append('"');
for (String includeAttr : bundle.getIncludeAttrs()) {
sb.append(", ");
sb.append(JAVASCRIPT.toStringLiteral(includeAttr));
}
sb.append(")");
for (Map.Entry entry : bundle.getAttrs().entrySet()) {
AttributeValidator validator = entry.getKey();
Expression condition = entry.getValue().getCondition();
Expression value = entry.getValue().getValue();
sb.append(".attr(");
sb.append(JAVASCRIPT.toStringLiteral(validator.getName()));
sb.append(", ");
sb.append(validator.isFlagSet(AttributeValidator.Flag.BOOLEAN)
? value.acceptVisitor(this)
: toAnonymousClosure(value));
if (condition != null) {
sb.append(", ");
sb.append(condition.acceptVisitor(this));
}
sb.append(")");
}
for (String subBundle : bundle.getSubBundles()) {
sb.append(".addBundle(");
sb.append(subBundle);
sb.append(")");
}
sb.append(".build()");
return sb.toString();
}
@Override
public String visitBooleanConstant(BooleanConstant value) {
return value.getValue().toString();
}
@Override
public String visitConcatenation(Concatenation value) {
return toAnonymousClosure(value);
}
@Override
public String visitConditional(Conditional value) {
return toAnonymousClosure(value);
}
@Override
public String visitConstructedConstant(ConstructedConstant node) {
StringBuilder sb = new StringBuilder();
sb.append(getCalleeName(node.getCallee()));
sb.append(".");
sb.append(getConstructorMethodName(node.getParam()));
sb.append("(\"");
sb.append(node.getValue());
sb.append("\")");
return sb.toString();
}
@Override
public String visitConvertibleToContent(ConvertibleToContent value) {
return toAnonymousClosure(value);
}
@Override
public String visitEscapeExpression(EscapeExpression value) {
return value.getSubexpression().acceptVisitor(this);
}
@Override
public String visitExampleExpression(ExampleExpression value) {
return value.getSubexpression().acceptVisitor(this);
}
@Override
public String visitExtractedMessage(ExtractedMessage msg) {
return toAnonymousClosure(msg);
}
@Override
public String visitLoopExpression(LoopExpression value) {
return toAnonymousClosure(value);
}
@Override
public String visitIsXmlExpression(IsXmlExpression ixe) {
return GXP_CONTEXT_VAR + ".isForcingXmlSyntax()";
}
@Override
public String visitNativeExpression(NativeExpression value) {
return JAVASCRIPT.validateExpression(alertSink, value);
}
@Override
public String visitObjectConstant(ObjectConstant node) {
return JAVASCRIPT.toStringLiteral(node.getValue());
}
@Override
public String visitStringConstant(StringConstant value) {
if (value.getSchema() == null) {
throw new AssertionError();
}
return value.getSchema().getContentFamily().acceptVisitor(STRING_CONSTANT_VISITOR, value);
}
private ContentFamilyVisitor
STRING_CONSTANT_VISITOR =
new ContentFamilyVisitor() {
public String visitCss(StringConstant value) {
return toAnonymousClosure(value);
}
public String visitJavaScript(StringConstant value) {
return toAnonymousClosure(value);
}
public String visitMarkup(StringConstant value) {
return toAnonymousClosure(value);
}
public String visitPlaintext(StringConstant value) {
return JAVASCRIPT.toStringLiteral(value.evaluate());
}
};
////////////////////////////////////////////////////////////////////////////////
// Call Visitors
////////////////////////////////////////////////////////////////////////////////
@Override
public String visitCall(Call value) {
return value.acceptCallVisitor(this);
}
@Override
public String visitBoundCall(BoundCall call) {
throw new UnexpectedNodeException(call);
}
@Override
public String visitUnboundCall(UnboundCall call) {
throw new UnexpectedNodeException(call);
}
@Override
public String visitValidatedCall(final ValidatedCall call) {
final Callable callee = call.getCallee();
final StringBuilder sb = new StringBuilder();
callee.acceptCallableVisitor(new CallableVisitor() {
public Void visitCallable(Callable callable) {
sb.append(callee.getName().toString());
sb.append(".getGxpClosure(");
COMMA_JOINER.appendTo(sb, getCallArguments(callee, call.getAttributes()));
sb.append(")");
return null;
}
public Void visitInstanceCallable(InstanceCallable callable) {
// we can't use getGxpClosure in the instance call case, because we have to
// return a single expression, so we can't set an inst variable like we
// do in StatementVisitor#visitValidatedCall
sb.append(toAnonymousClosure(call));
return null;
}
});
return sb.toString();
}
}
private String toAnonymousClosure(Expression value) {
StringBuilder sb = new StringBuilder();
TemplateWorker subWorker = createSubWorker(sb);
subWorker.toAnonymousClosureImpl(value);
sb.append("})");
return sb.toString();
}
private void toAnonymousClosureImpl(Expression value) {
formatLine(value.getSourcePosition(), "new %s(function(%s) {",
value.getSchema().getJavaScriptType(), GXP_SIG);
value.acceptVisitor(statementVisitor);
formatLine("return %s;", GXP_OUT_VAR);
}
}
}