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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.cpp;
import com.google.common.base.Function;
import com.google.common.base.Joiner;
import com.google.common.base.Preconditions;
import com.google.common.collect.Iterables;
import com.google.common.collect.ImmutableList;
import com.google.common.collect.Lists;
import com.google.gxp.compiler.alerts.AlertSink;
import com.google.gxp.compiler.alerts.common.NothingToCompileError;
import com.google.gxp.compiler.base.BooleanType;
import com.google.gxp.compiler.base.BundleType;
import com.google.gxp.compiler.base.ContentType;
import com.google.gxp.compiler.base.CppFileImport;
import com.google.gxp.compiler.base.CppLibraryImport;
import com.google.gxp.compiler.base.DefaultingImportVisitor;
import com.google.gxp.compiler.base.FormalTypeParameter;
import com.google.gxp.compiler.base.Parameter;
import com.google.gxp.compiler.base.Import;
import com.google.gxp.compiler.base.ImportVisitor;
import com.google.gxp.compiler.base.InstanceType;
import com.google.gxp.compiler.base.Interface;
import com.google.gxp.compiler.base.NativeType;
import com.google.gxp.compiler.base.NullRoot;
import com.google.gxp.compiler.base.Root;
import com.google.gxp.compiler.base.RootVisitor;
import com.google.gxp.compiler.base.Template;
import com.google.gxp.compiler.base.TemplateName;
import com.google.gxp.compiler.base.TemplateType;
import com.google.gxp.compiler.base.Tree;
import com.google.gxp.compiler.base.Type;
import com.google.gxp.compiler.base.TypeVisitor;
import com.google.gxp.compiler.codegen.BracesCodeGenerator;
import java.io.IOException;
import java.util.List;
import java.util.Set;
/**
* Base class for C++ {@code CodeGenerator}s.
*/
public abstract class BaseCppCodeGenerator> extends BracesCodeGenerator {
protected BaseCppCodeGenerator(T tree) {
super(tree);
}
public void generateCode(final Appendable appendable, final AlertSink alertSink)
throws IOException {
alertSink.addAll(tree.getAlerts());
root.acceptVisitor(new RootVisitor() {
public Void visitInterface(Interface iface) {
createInterfaceWorker(appendable, alertSink, iface).run();
return null;
}
public Void visitNullRoot(NullRoot nullRoot) {
alertSink.add(new NothingToCompileError(nullRoot.getSourcePosition()));
return null;
}
public Void visitTemplate(Template template) {
createTemplateWorker(appendable, alertSink, template).run();
return null;
}
});
}
protected abstract static class Worker extends BracesCodeGenerator.Worker {
protected Worker(Appendable out, AlertSink alertSink) {
super(out, alertSink, "public:", "private:");
}
protected String getClassName(TemplateName name) {
return name.getBaseName();
}
protected String getQualifiedClassName(TemplateName name) {
return Joiner.on("::").join(name.toString().split("\\."));
}
private String getIfdefGuard(TemplateName templateName) {
return templateName.toString().replace('.', '_').toUpperCase() + "_H__";
}
protected void appendIfdefGuardStart(Root root) {
String ifdefGuard = getIfdefGuard(root.getName());
formatLine("#ifndef %s", ifdefGuard);
formatLine("#define %s", ifdefGuard);
}
protected void appendIfdefGuardEnd(Root root) {
formatLine("#endif // %s", getIfdefGuard(root.getName()));
}
private final ImportVisitor IMPORT_VISITOR =
new DefaultingImportVisitor(){
public Void defaultVisitImport(Import imp) {
// do nothing
return null;
}
public Void visitCppFileImport(CppFileImport imp) {
formatLine(imp.getSourcePosition(), "#include %s", imp.getTarget());
return null;
}
public Void visitCppLibraryImport(CppLibraryImport imp) {
formatLine(imp.getSourcePosition(), "#include %s", imp.getTarget());
return null;
}
};
protected void appendImports(Root root) {
for (String imp : root.getSchema().getCppImports()) {
formatLine(root.getSourcePosition(), "#include \"%s\"", imp);
}
for (Import imp : root.getImports()) {
imp.acceptVisitor(IMPORT_VISITOR);
}
}
protected void appendImports(Root root, Set extraIncludes) {
appendImports(root);
for (TemplateName extraInclude : extraIncludes) {
formatLine("#include \"%s.h\"", extraInclude.toString().replace('.', '/'));
}
}
protected void appendNamespacesOpen(TemplateName templateName) {
for (String part : templateName.getPackageName().split("\\.")) {
formatLine("namespace %s {", part);
}
}
protected void appendNamespacesClose(TemplateName templateName) {
for (String part : templateName.getPackageName().split("\\.")) {
appendLine("}");
}
}
protected static final String GXP_OUT_VAR = "gxp_out";
protected static final String GXP_CONTEXT_VAR = "gxp_context";
protected static final String GXP_SIG =
COMMA_JOINER.join("%s " + GXP_OUT_VAR, "const GxpContext& " + GXP_CONTEXT_VAR);
protected static final String DEFAULT_GXP_OUT_TYPE = "Appendable*";
/**
* Defines a type that can be the first parameter to a gxp Write method along
* with the wrapper class that turns this type into an Appendable.
*/
protected class ExtraOutType {
private final String outType;
private final String outWrapper;
public ExtraOutType(String outType, String outWrapper) {
this.outType = Preconditions.checkNotNull(outType);
this.outWrapper = Preconditions.checkNotNull(outWrapper);
}
public String getOutType() {
return outType;
}
public String getOutWrapper() {
return outWrapper;
}
public String getGxpSig() {
return String.format(GXP_SIG, outType);
}
}
protected List extraOutTypes = ImmutableList.of(
new ExtraOutType("string*", "StringAppendable"));
protected String toCppType(Type type) {
return type.acceptTypeVisitor(new TypeVisitor() {
public String visitBooleanType(BooleanType type) {
return "bool";
}
public String visitBundleType(BundleType type) {
// TODO(harryh): make this real, only an int now so it's
// a valid C++ type
return "int";
}
public String visitContentType(ContentType type) {
return type.getSchema().getCppType() + "*";
}
public String visitInstanceType(InstanceType type) {
return getClassName(type.getTemplateName()) + "::Interface";
}
public String visitNativeType(NativeType type) {
return CppUtil.validateType(alertSink, type);
}
public String visitTemplateType(TemplateType type) {
return getClassName(type.getTemplateName());
}
});
}
protected Function parameterToCallName =
new Function() {
public String apply(Parameter param) {
StringBuilder sb = new StringBuilder();
sb.append(toCppType(param.getType()));
sb.append(" ");
sb.append(param.getPrimaryName());
return sb.toString();
}
};
protected List toBoundedTypeDecls(boolean isDeclaration,
Iterable formalTypeParameters) {
List result = Lists.newArrayList();
for (FormalTypeParameter formalTypeParameter : formalTypeParameters) {
if (isDeclaration) {
result.add("typename " + formalTypeParameter.getName());
} else {
result.add(formalTypeParameter.getName());
}
}
return result;
}
protected void appendCppFormalTypeParameters(StringBuilder sb, boolean isDeclaration,
List formalTypeParameters) {
if (!formalTypeParameters.isEmpty()) {
if (isDeclaration) {
sb.append("template");
}
sb.append("<");
COMMA_JOINER.appendTo(sb, toBoundedTypeDecls(isDeclaration, formalTypeParameters));
sb.append(">");
}
}
protected void appendCppFormalTypeParameters(boolean isDeclaration,
List formalTypeParameters) {
StringBuilder sb = new StringBuilder();
appendCppFormalTypeParameters(sb, isDeclaration, formalTypeParameters);
appendLine(sb.toString());
}
protected Function parameterToInitializer =
new Function() {
public String apply(Parameter param) {
return param.getPrimaryName() + "(" + param.getPrimaryName() + ")";
}
};
}
protected abstract InterfaceWorker createInterfaceWorker(Appendable out,
AlertSink alertSink,
Interface iface);
protected abstract static class InterfaceWorker extends Worker {
protected final Interface iface;
protected InterfaceWorker(Appendable out, AlertSink alertSink, Interface iface) {
super(out, alertSink);
this.iface = Preconditions.checkNotNull(iface);
}
protected abstract void appendClass();
public void run() {
appendHeader(iface);
appendLine();
appendClass();
appendLine();
appendFooter();
}
}
protected abstract TemplateWorker createTemplateWorker(Appendable out,
AlertSink alertSink,
Template template);
protected abstract static class TemplateWorker extends Worker {
protected final Template template;
protected TemplateWorker(Appendable out, AlertSink alertSink, Template template) {
super(out, alertSink);
this.template = Preconditions.checkNotNull(template);
}
protected abstract void appendClass();
public void run() {
appendHeader(template);
appendLine();
appendClass();
appendLine();
appendFooter();
}
protected String getWriteMethodSignature(boolean outsideClass, boolean isStatic) {
return getWriteMethodSignature(DEFAULT_GXP_OUT_TYPE, outsideClass, isStatic);
}
protected String getWriteMethodSignature(String outType, boolean outsideClass,
boolean isStatic) {
Iterable params = isStatic
? template.getAllParameters()
: template.getParameters();
StringBuilder sb = new StringBuilder();
if (isStatic) {
if (!template.getFormalTypeParameters().isEmpty()) {
appendCppFormalTypeParameters(sb, true, template.getFormalTypeParameters());
sb.append("\n");
}
if (!outsideClass) {
sb.append("static ");
}
}
sb.append("void ");
if (outsideClass) {
sb.append(getQualifiedClassName(template.getName()));
sb.append("::");
}
sb.append("Write(");
COMMA_JOINER.appendTo(sb, Iterables.concat(
ImmutableList.of(String.format(GXP_SIG, outType)),
Iterables.transform(params, parameterToCallName)));
sb.append(")");
return sb.toString();
}
// TODO(harryh): combine this with getWriteMethodSignature() in some way?
protected String getGetGxpClosureMethodSignature(boolean outsideClass, boolean isStatic) {
Iterable params = isStatic
? template.getAllParameters()
: template.getParameters();
StringBuilder sb = new StringBuilder();
if (isStatic) {
if (!template.getFormalTypeParameters().isEmpty()) {
appendCppFormalTypeParameters(sb, true, template.getFormalTypeParameters());
sb.append("\n");
}
if (!outsideClass) {
sb.append("static ");
}
}
sb.append(toCppType(new ContentType(template.getSchema())));
sb.append(" ");
if (outsideClass) {
sb.append(getQualifiedClassName(template.getName()));
sb.append("::");
}
sb.append("GetGxpClosure(");
COMMA_JOINER.appendTo(sb, Iterables.transform(params, parameterToCallName));
sb.append(")");
return sb.toString();
}
}
}