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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.java;
import static com.google.gxp.compiler.base.OutputLanguage.JAVA;
import com.google.common.base.CharEscapers;
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.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.CallVisitor;
import com.google.gxp.compiler.base.Callable;
import com.google.gxp.compiler.base.CallableVisitor;
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.ExhaustiveExpressionVisitor;
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.Implementable;
import com.google.gxp.compiler.base.InstanceCallable;
import com.google.gxp.compiler.base.IsXmlExpression;
import com.google.gxp.compiler.base.JavaAnnotation;
import com.google.gxp.compiler.base.LoopExpression;
import com.google.gxp.compiler.base.NativeExpression;
import com.google.gxp.compiler.base.ObjectConstant;
import com.google.gxp.compiler.base.OutputLanguage;
import com.google.gxp.compiler.base.Parameter;
import com.google.gxp.compiler.base.StringConstant;
import com.google.gxp.compiler.base.Template;
import com.google.gxp.compiler.base.ThrowsDeclaration;
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.DuplicateMessageNameError;
import com.google.gxp.compiler.codegen.LoopMissingBothIterableAndIteratorError;
import com.google.gxp.compiler.codegen.MissingExpressionError;
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.Message;
import java.util.ArrayDeque;
import java.util.Deque;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import java.util.Set;
/**
* A {@code CodeGenerator} that generates Java code.
*/
public class JavaCodeGenerator extends BaseJavaCodeGenerator {
/**
* @param tree the MessageExtractedTree to compile.
* @param runtimeMessageSource the message source to use at runtime, or null
* if none was provided. This is a (typically dotted) prefix used when
* loading message resources at runtime.
*/
public JavaCodeGenerator(MessageExtractedTree tree, String runtimeMessageSource) {
super(tree, runtimeMessageSource);
}
@Override
protected TemplateWorker createTemplateWorker(Appendable appendable,
AlertSink alertSink,
Template template,
String runtimeMessageSource) {
return new TemplateWorker(appendable, alertSink, template, runtimeMessageSource);
}
/**
* Helper class which exists mainly so we don't have to pass the CIndenter
* and AlertSink everywhere manually.
*/
protected static class TemplateWorker extends BaseJavaCodeGenerator.TemplateWorker {
private int varCounter = 0;
private final String runtimeMessageSource;
protected final Set anonymousSchemas = Sets.newTreeSet();
TemplateWorker(Appendable appendable, AlertSink alertSink,
Template template, String runtimeMessageSource) {
super(appendable, alertSink, template);
this.runtimeMessageSource = runtimeMessageSource;
}
public TemplateWorker createSubWorker(Appendable newAppendable) {
return new TemplateWorker(newAppendable, alertSink, template, runtimeMessageSource);
}
/**
* 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++;
}
@Override
protected String getBaseClassName() {
return "com.google.gxp.base.GxpTemplate";
}
@Override
protected void appendClass() {
appendAnnotations(template.getJavaAnnotations(JavaAnnotation.Element.CLASS));
appendClassDecl();
appendLine();
if (runtimeMessageSource != null) {
formatLine("private static final String GXP$MESSAGE_SOURCE = %s;",
JAVA.toStringLiteral(runtimeMessageSource));
appendNamedMessageDefinitions();
appendLine();
}
appendWriteMethod();
appendDefaultAccessors();
appendParamConstructors();
appendAnonymousInterfaces();
appendGetArgListMethod();
appendGetGxpClosureMethod(true);
appendInterface();
appendInstance();
appendLine("}");
}
protected void appendClassDecl() {
formatLine(template.getSourcePosition(), "public class %s extends %s {",
getClassName(template.getName()), getBaseClassName());
}
private void appendNamedMessageDefinitions() {
template.getContent().acceptVisitor(new DuplicateMessageNameVisitor());
template.getContent().acceptVisitor(new NamedExtractedMessageVisitor());
}
private String getAnonymousJavaType(Schema schema) {
return "Anonymous" + getBaseName(schema.getJavaType());
}
/**
* Generates private abstract static classes for all the anonymous closures
* needed by this template
*/
private void appendAnonymousInterfaces() {
for (Schema schema : anonymousSchemas) {
appendLine();
appendLine("private abstract static class " + getAnonymousJavaType(schema));
appendLine(" extends GxpTemplate.AnonymousGxpClosure");
appendLine(" implements " + schema.getJavaType() + " {");
appendLine("}");
}
}
/**
* Generates private constants for default values and accessor methods for
* retrieving them.
*/
private void appendDefaultAccessors() {
for (Parameter param : template.getAllParameters()) {
Expression defaultValue = param.getDefaultValue();
if (defaultValue != null) {
String paramType = toJavaType(param.getType());
appendLine();
formatLine(param.getDefaultValue().getSourcePosition(),
"private static final %s GXP_DEFAULT$%s = %s;",
paramType, param.getPrimaryName(),
getJavaExpression(param.getDefaultValue()));
appendLine();
String methodName = getDefaultMethodName(param);
formatLine("public static %s %s() {", paramType, methodName);
formatLine("return GXP_DEFAULT$%s;", param.getPrimaryName());
appendLine("}");
}
}
}
/**
* Generates methods for constructing object parameters from strings.
*/
private void appendParamConstructors() {
for (Parameter param : template.getParameters()) {
if (param.getConstructor() != null) {
appendLine();
formatLine(param.getSourcePosition(),
"public static %s %s(String %s) {",
toJavaType(param.getType()),
getConstructorMethodName(param),
param.getPrimaryName());
appendLine(param.getSourcePosition(), "return "
+ param.getConstructor().acceptVisitor(toExpressionVisitor) + ";");
appendLine("}");
}
}
}
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) + "()"
: getJavaExpression(parameter.getType().getDefaultValue());
if (value == null) {
fParams.add(defaultFetchString);
} else if (value.getCondition() != null) {
String s = "(" +
getJavaExpression(value.getCondition()) +
" ? " + getJavaExpression(value.getValue()) + " : " +
defaultFetchString + ")";
fParams.add(s);
} else {
fParams.add(getJavaExpression(value.getValue()));
}
}
}
return fParams;
}
@Override
protected void appendWriteMethodBody() {
appendLine("final java.util.Locale gxp_locale = gxp_context.getLocale();");
List throwsDecls = template.getThrowsDeclarations();
if (!throwsDecls.isEmpty()) {
appendLine("try {");
}
template.getContent().acceptVisitor(statementVisitor);
if (!throwsDecls.isEmpty()) {
String runtimeExceptionVar = createVarName("runtimeException");
String causeVar = createVarName("cause");
formatLine("} catch (com.google.gxp.base.GxpRuntimeException %s) {", runtimeExceptionVar);
formatLine("final java.lang.Throwable %s = %s.getCause();", causeVar, runtimeExceptionVar);
for (ThrowsDeclaration throwsDecl : throwsDecls) {
String excType = throwsDecl.getExceptionType();
formatLine(throwsDecl.getSourcePosition(),
"if (%s instanceof %s) throw (%s) %s;",
causeVar, excType, excType, causeVar);
}
formatLine("throw %s;", runtimeExceptionVar);
appendLine("}");
}
}
protected void writeExpression(SourcePosition sourcePosition, String expr) {
appendLine(sourcePosition, GXP_OUT_VAR + ".append(" + expr + ");");
}
private static final int MAX_JAVA_STRING_LENGTH = 65534;
// TODO(danignatoff): something else does this too. Merge.
protected void writeString(SourcePosition pos, String s) {
int length = s.length();
if (length != 0) {
int curPos = 0;
while (length - curPos > MAX_JAVA_STRING_LENGTH) {
writeExpression(pos, JAVA.toStringLiteral(
s.substring(curPos, curPos + MAX_JAVA_STRING_LENGTH)));
curPos += MAX_JAVA_STRING_LENGTH;
}
writeExpression(pos, JAVA.toStringLiteral(s.substring(curPos, length)));
}
}
private final StatementVisitor statementVisitor = getStatementVisitor();
private final ExpressionVisitor toExpressionVisitor =
new ToExpressionVisitor();
private final ExpressionVisitor toEscapableExpressionVisitor =
getToEscapableExpressionVisitor();
protected StatementVisitor getStatementVisitor() {
return new StatementVisitor();
}
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 callable.getName().toString();
}
public String visitInstanceCallable(InstanceCallable callable) {
return instantiatedGxps.peek();
}
});
}
/**
* A visitor that creates Alerts when it encounters a duplicate Java message name.
*/
private class DuplicateMessageNameVisitor extends ExhaustiveExpressionVisitor {
private Set names = Sets.newHashSet();
@Override
public Expression visitExtractedMessage(ExtractedMessage msg) {
if (isNamed(msg)) {
String name = msg.getName(OutputLanguage.JAVA);
if (names.contains(name)) {
alertSink.add(new DuplicateMessageNameError(msg, name));
} else {
names.add(name);
}
}
return super.visitExtractedMessage(msg);
}
}
/**
* A visitor that outputs MessageReference definitions to {@code out} based on the named
* ExtractedMessages that it visits.
*/
private class NamedExtractedMessageVisitor extends ExhaustiveExpressionVisitor {
private static final String MESSAGE_REFERENCE_CLASSNAME_PREFIX
= "com.google.gxp.base.MessageReference";
@Override
public Expression visitExtractedMessage(ExtractedMessage msg) {
if (isNamed(msg)) {
validateName(msg);
outputNamedMessage(msg);
}
return super.visitExtractedMessage(msg);
}
private void validateName(ExtractedMessage msg) {
JAVA.validateName(alertSink, msg, msg.getName(OutputLanguage.JAVA));
}
private void outputNamedMessage(ExtractedMessage msg) {
// TODO: include msg.getParameters().size() in class name?
formatLine(msg.getSourcePosition(), "public static final %s %s",
MESSAGE_REFERENCE_CLASSNAME_PREFIX,
msg.getName(OutputLanguage.JAVA));
formatLine(" = new %s(GXP$MESSAGE_SOURCE, %sL);",
MESSAGE_REFERENCE_CLASSNAME_PREFIX,
msg.getTcMessage().getId());
}
}
private boolean isNamed(ExtractedMessage msg) {
String name = msg.getName(OutputLanguage.JAVA);
return name != null && name.trim().length() > 0;
}
/**
* 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);
}
@Override
public Void visitExceptionExpression(ExceptionExpression value) {
String excClass;
switch (value.getKind()) {
case NOT_SUPPORTED_IN_SGML_MODE:
excClass = "java.lang.IllegalStateException";
break;
default:
throw new AssertionError("Unsupported ExceptionExpression.Kind: " + value.getKind());
}
appendLine(value.getSourcePosition(),
"throw new " + excClass + "("
+ JAVA.toStringLiteral(value.getMessage()) + ");");
return null;
}
@Override
public Void visitStringConstant(StringConstant value) {
if (value.getSchema() == null) {
throw new AssertionError();
}
writeString(value.getSourcePosition(), value.evaluate());
return null;
}
@Override
public Void visitEscapeExpression(EscapeExpression value) {
formatLine(value.getSourcePosition(), "%s.INSTANCE.append(%s, %s, %s);",
value.getSchema().getJavaAppender(), GXP_OUT_VAR, GXP_CONTEXT_VAR,
getEscapableExpression(value.getSubexpression()));
return null;
}
@Override
public Void visitExampleExpression(ExampleExpression value) {
return value.getSubexpression().acceptVisitor(this);
}
@Override
public Void visitConvertibleToContent(ConvertibleToContent value) {
value.getSubexpression().acceptVisitor(this);
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 + getJavaExpression(predicate) + ") {");
clause.getExpression().acceptVisitor(this);
}
private void writeConditionalDelim(Expression delimiter,
String boolVar) {
if (!delimiter.alwaysEmpty()) {
formatLine("if (%s) {", boolVar);
delimiter.acceptVisitor(this);
appendLine("} else {");
formatLine("%s = true;", boolVar);
appendLine("}");
}
}
@Override
public Void visitLoopExpression(LoopExpression loop) {
// start outer scope for temporary variables
appendLine("{");
Expression delimiter = loop.getDelimiter();
String boolVar = createVarName("bool");
if (!delimiter.alwaysEmpty()) {
formatLine("boolean %s = false;", boolVar);
}
String tmpKeyVar = null, keyVar = null;
if (loop.getKey() != null) {
tmpKeyVar = createVarName("key");
keyVar = JAVA.validateName(alertSink, loop, loop.getKey());
formatLine("int %s = 0;", tmpKeyVar);
}
if (loop.getIterator() != null && loop.getIterator().canEvaluateAs(JAVA)) {
String iterVar = createVarName("iter");
Expression iter = loop.getIterator();
formatLine(iter.getSourcePosition(),
"final java.util.Iterator %s = %s;",
JavaUtil.toReferenceType(toJavaType(loop.getType())),
iterVar,
getJavaExpression(iter));
// the loop itself
formatLine(loop.getSourcePosition(),
"while (%s.hasNext()) {",
iterVar);
String itemExpr = JavaUtil.unbox(iterVar + ".next()",
toJavaType(loop.getType()));
formatLine(loop.getType().getSourcePosition(),
"final %s %s = %s;",
toJavaType(loop.getType()),
JAVA.validateName(alertSink, loop, loop.getVar()),
itemExpr);
writeConditionalDelim(delimiter, boolVar);
if (keyVar != null) {
formatLine("final int %s = %s++;", keyVar, tmpKeyVar);
}
loop.getSubexpression().acceptVisitor(this);
appendLine("}");
} else if (loop.getIterable() != null && loop.getIterable().canEvaluateAs(JAVA)) {
formatLine(loop.getSourcePosition(), "for (final %s %s : %s) {",
toJavaType(loop.getType()),
JAVA.validateName(alertSink, loop, loop.getVar()),
getJavaExpression(loop.getIterable()));
writeConditionalDelim(delimiter, boolVar);
if (keyVar != null) {
formatLine("final int %s = %s++;", keyVar, tmpKeyVar);
}
loop.getSubexpression().acceptVisitor(this);
appendLine("}");
} else {
// if we only have an expression for 1 of iterable/iterator then we
// add a MissingExpressionAlert
if (loop.getIterable() == null && loop.getIterator() != null) {
alertSink.add(new MissingExpressionError(loop.getIterator(), JAVA));
} else if (loop.getIterator() == null && loop.getIterable() != null) {
alertSink.add(new MissingExpressionError(loop.getIterable(), JAVA));
} else {
alertSink.add(new LoopMissingBothIterableAndIteratorError(loop, JAVA));
}
}
// close outer scope
appendLine("}");
return null;
}
@Override
public Void visitAbbrExpression(AbbrExpression abbr) {
appendLine("{");
formatLine(abbr.getSourcePosition(),
"final %s %s = %s;",
toJavaType(abbr.getType()),
JAVA.validateName(alertSink, abbr, abbr.getName()),
getJavaExpression(abbr.getValue()));
abbr.getContent().acceptVisitor(this);
appendLine("}");
return null;
}
@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(), "%s %s = %s;",
toJavaType(callable.getInstanceType()),
instantiatedGxps.peek(),
thisAttr.getValue().acceptVisitor(toExpressionVisitor));
}
return true;
}
});
sb.append(getCalleeName(callee));
sb.append(".write(");
sb.append(GXP_OUT_VAR);
sb.append(", ");
sb.append(GXP_CONTEXT_VAR);
for (String param : getCallArguments(callee, params)) {
sb.append(", ");
sb.append(param);
}
sb.append(");");
appendLine(call.getSourcePosition(), sb);
if (isInstance) {
instantiatedGxps.pop();
appendLine("}");
}
// TODO(laurence): use mangled method name for greater safety?
return null;
}
@Override
public Void visitExtractedMessage(ExtractedMessage msg) {
if (runtimeMessageSource == null) {
alertSink.add(new NoMessageSourceError(msg));
}
Message tcMessage = msg.getTcMessage();
formatLine("// MSG %s=%s",
tcMessage.getId(),
CharEscapers.javaStringUnicodeEscaper().escape(
tcMessage.getOriginal().replace("\n", " ")));
StringBuilder sb = new StringBuilder("GxpTemplate.getMessage(GXP$MESSAGE_SOURCE, ");
sb.append("gxp_context.getLocale(), ");
sb.append(tcMessage.getId());
sb.append("L");
for (Expression param : msg.getParameters()) {
sb.append(", ");
sb.append(getEscapedString(param));
}
sb.append(")");
String getMessage = sb.toString();
writeExpression(msg.getSourcePosition(), getMessage);
return null;
}
}
protected final String getJavaExpression(Expression value) {
return value.acceptVisitor(toExpressionVisitor);
}
protected final String getEscapedString(Expression value) {
StringBuilder sb = new StringBuilder(value.getSchema().getJavaAppender());
sb.append(".INSTANCE.append(new java.lang.StringBuilder(), ");
sb.append(GXP_CONTEXT_VAR);
sb.append(", ");
sb.append(getJavaExpression(value));
sb.append(").toString()");
return sb.toString();
}
private String getEscapableExpression(Expression value) {
return value.acceptVisitor(toEscapableExpressionVisitor);
}
protected ToEscapableExpressionVisitor getToEscapableExpressionVisitor() {
return new ToEscapableExpressionVisitor();
}
/**
* Converts an Expression into a Java 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);
}
@Override
public String visitAttrBundleReference(AttrBundleReference value) {
return value.getName();
}
@Override
public String visitNativeExpression(NativeExpression value) {
StringBuilder sb = new StringBuilder();
sb.append('(');
sb.append(JAVA.validateExpression(alertSink, value));
sb.append(')');
return sb.toString();
}
@Override
public String visitEscapeExpression(EscapeExpression value) {
StringBuilder sb = new StringBuilder();
sb.append(value.getSchema().getJavaAppender());
sb.append(".INSTANCE.append(new StringBuilder(), ");
sb.append(GXP_CONTEXT_VAR);
sb.append(", ");
sb.append(getEscapableExpression(value.getSubexpression()));
sb.append(")");
return sb.toString();
}
@Override
public String visitExtractedMessage(ExtractedMessage msg) {
if (runtimeMessageSource == null) {
alertSink.add(new NoMessageSourceError(msg));
}
Message tcMessage = msg.getTcMessage();
StringBuilder sb = new StringBuilder("GxpTemplate.getMessage(GXP$MESSAGE_SOURCE, ");
sb.append("gxp_context.getLocale(), ");
sb.append(String.format("/* \"%s\" */ ",
CharEscapers.javaStringUnicodeEscaper().escape(
tcMessage.getOriginal()
.replace("\n", " ")
.replace("\\*/", "*/"))));
sb.append(tcMessage.getId());
sb.append("L");
for (Expression param : msg.getParameters()) {
sb.append(", ");
sb.append(getEscapedString(param));
}
sb.append(")");
return sb.toString();
}
@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(getJavaExpression(call));
sb.append(")");
return sb.toString();
}
}
private class ToExpressionVisitor
extends DefaultingExpressionVisitor
implements CallVisitor {
@Override
public String defaultVisitExpression(Expression value) {
throw new UnexpectedNodeException(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 GxpAttrBundle.Builder<");
sb.append(bundle.getSchema().getJavaType());
sb.append(">(");
List includeAttrs = Lists.newArrayList();
for (String includeAttr : bundle.getIncludeAttrs()) {
includeAttrs.add(JAVA.toStringLiteral(includeAttr));
}
COMMA_JOINER.appendTo(sb, includeAttrs);
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(JAVA.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 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) {
String s = CharEscapers.javaStringEscaper().escape(
value.evaluate());
return "\"" + s + "\"";
}
};
// TODO(harryh): validate the value when it is a primitive type
@Override
public String visitObjectConstant(ObjectConstant node) {
String value = node.getValue();
String type = toJavaType(node.getType());
if (!JavaUtil.isPrimitiveType(type)) {
value = type + ".valueOf(\""
+ CharEscapers.javaStringEscaper().escape(value) + "\")";
} else {
if (!JavaUtil.isValidPrimitive(value, type)) {
alertSink.add(new IllegalJavaPrimitiveError(node, value, type));
}
}
return 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 visitEscapeExpression(EscapeExpression value) {
// TODO(laurence): perhaps we shouldn't be generating these
// EscapeExpressions at all?
return value.getSubexpression().acceptVisitor(this);
}
@Override
public String visitExampleExpression(ExampleExpression value) {
return value.getSubexpression().acceptVisitor(this);
}
@Override
public String visitNativeExpression(NativeExpression value) {
return JAVA.validateExpression(alertSink, value);
}
@Override
public String visitConvertibleToContent(ConvertibleToContent value) {
return toAnonymousClosure(value);
}
@Override
public String visitConcatenation(Concatenation value) {
return toAnonymousClosure(value);
}
@Override
public String visitConditional(Conditional value) {
// TODO(laurence): use "?:" operator instead?
return toAnonymousClosure(value);
}
@Override
public String visitLoopExpression(LoopExpression value) {
return toAnonymousClosure(value);
}
@Override
public String visitCall(Call value) {
return value.acceptCallVisitor(this);
}
public String visitBoundCall(BoundCall call) {
throw new UnexpectedNodeException(call);
}
public String visitUnboundCall(UnboundCall call) {
throw new UnexpectedNodeException(call);
}
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();
}
@Override
public String visitAbbrExpression(AbbrExpression value) {
return toAnonymousClosure(value);
}
@Override
public String visitExtractedMessage(ExtractedMessage msg) {
return toAnonymousClosure(msg);
}
@Override
public String visitIsXmlExpression(IsXmlExpression ixe) {
return "gxp_context.isForcingXmlSyntax()";
}
}
private String toAnonymousClosure(Expression value) {
StringBuilder sb = new StringBuilder();
TemplateWorker subWorker = createSubWorker(sb);
subWorker.toAnonymousClosureImpl(value);
anonymousSchemas.addAll(subWorker.anonymousSchemas);
// XXX We do this here to avoid the newline appended by CIndenter.append.
sb.append("}");
return sb.toString();
}
private void toAnonymousClosureImpl(Expression value) {
// add the schema of this value to the Set of schemas we need
// interface definitions for
anonymousSchemas.add(value.getSchema());
appendLine(value.getSourcePosition(),
"new " + getAnonymousJavaType(value.getSchema()) + "() {");
StringBuilder sb = new StringBuilder();
appendJavaThrowsDeclaration(sb, template.getThrowsDeclarations());
appendLine("@Override");
formatLine(value.getSourcePosition(),
"protected void writeImpl(%s) %s {",
GXP_SIG, sb.toString());
// Fill in writeImpl method.
value.acceptVisitor(statementVisitor);
// End writeImpl method.
appendLine("}");
}
}
}