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Groovy: A powerful, dynamic language for the JVM
/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you 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 groovy.text.markup;
import org.codehaus.groovy.ast.ClassCodeExpressionTransformer;
import org.codehaus.groovy.ast.ClassHelper;
import org.codehaus.groovy.ast.ClassNode;
import org.codehaus.groovy.ast.DynamicVariable;
import org.codehaus.groovy.ast.Parameter;
import org.codehaus.groovy.ast.VariableScope;
import org.codehaus.groovy.ast.expr.ArgumentListExpression;
import org.codehaus.groovy.ast.expr.ArrayExpression;
import org.codehaus.groovy.ast.expr.BinaryExpression;
import org.codehaus.groovy.ast.expr.ClosureExpression;
import org.codehaus.groovy.ast.expr.ConstantExpression;
import org.codehaus.groovy.ast.expr.DeclarationExpression;
import org.codehaus.groovy.ast.expr.EmptyExpression;
import org.codehaus.groovy.ast.expr.Expression;
import org.codehaus.groovy.ast.expr.GStringExpression;
import org.codehaus.groovy.ast.expr.MapEntryExpression;
import org.codehaus.groovy.ast.expr.MapExpression;
import org.codehaus.groovy.ast.expr.MethodCallExpression;
import org.codehaus.groovy.ast.expr.TupleExpression;
import org.codehaus.groovy.ast.expr.VariableExpression;
import org.codehaus.groovy.ast.stmt.BlockStatement;
import org.codehaus.groovy.ast.stmt.ExpressionStatement;
import org.codehaus.groovy.ast.stmt.Statement;
import org.codehaus.groovy.control.SourceUnit;
import org.codehaus.groovy.syntax.Types;
import java.util.ArrayList;
import java.util.Collections;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
/**
* This AST transformer is responsible for modifying a source template into something which can be compiled as a
* {@link groovy.text.markup.BaseTemplate} subclass.
*
* It performs the following operations:
*
* - replace dynamic variables with getModel().get(dynamicVariable) calls
- optionally wrap
* getModel().get(...) calls into tryEscape calls for automatic escaping
- replace include
* XXX:'...' calls with the appropriate includeXXXX method calls
- replace ':tagName'() calls
* into methodMissing('tagName', ...) calls
*
* @author Cedric Champeau
*/
class MarkupBuilderCodeTransformer extends ClassCodeExpressionTransformer {
static final String TARGET_VARIABLE = "target.variable";
private final SourceUnit unit;
private final boolean autoEscape;
private final ClassNode classNode;
public MarkupBuilderCodeTransformer(final SourceUnit unit, final ClassNode classNode, final boolean autoEscape) {
this.unit = unit;
this.autoEscape = autoEscape;
this.classNode = classNode;
}
@Override
protected SourceUnit getSourceUnit() {
return unit;
}
@Override
public Expression transform(final Expression exp) {
if (exp instanceof BinaryExpression) {
return transformBinaryExpression((BinaryExpression) exp);
}
if (exp instanceof MethodCallExpression) {
return transformMethodCall((MethodCallExpression) exp);
}
if (exp instanceof ClosureExpression) {
ClosureExpression cl = (ClosureExpression) exp;
cl.getCode().visit(this);
return cl;
}
if (exp instanceof VariableExpression) {
VariableExpression var = (VariableExpression) exp;
if (var.getAccessedVariable() instanceof DynamicVariable) {
MethodCallExpression callGetModel = new MethodCallExpression(
new VariableExpression("this"),
"getModel",
ArgumentListExpression.EMPTY_ARGUMENTS
);
callGetModel.setImplicitThis(true);
callGetModel.setSourcePosition(exp);
String varName = var.getName();
if ("model".equals(varName) || "unescaped".equals(varName)) {
return callGetModel;
}
MethodCallExpression mce = new MethodCallExpression(
callGetModel,
"get",
new ArgumentListExpression(new ConstantExpression(varName))
);
mce.setSourcePosition(exp);
mce.setImplicitThis(false);
MethodCallExpression yield = new MethodCallExpression(
new VariableExpression("this"),
"tryEscape",
new ArgumentListExpression(mce)
);
yield.setImplicitThis(true);
yield.setSourcePosition(exp);
yield.putNodeMetaData(TARGET_VARIABLE, varName);
return autoEscape?yield:mce;
}
}
return super.transform(exp);
}
private Expression transformBinaryExpression(final BinaryExpression bin) {
Expression left = bin.getLeftExpression();
Expression right = bin.getRightExpression();
boolean assignment = bin.getOperation().getType() == Types.ASSIGN;
if (assignment && left instanceof VariableExpression) {
VariableExpression var = (VariableExpression) left;
if (var.getAccessedVariable() instanceof DynamicVariable) {
String varName = var.getName();
if (!"modelTypes".equals(varName)) {
MethodCallExpression callGetModel = new MethodCallExpression(
new VariableExpression("this"),
"getModel",
ArgumentListExpression.EMPTY_ARGUMENTS
);
callGetModel.setImplicitThis(true);
callGetModel.setSourcePosition(left);
MethodCallExpression mce = new MethodCallExpression(
callGetModel,
"put",
new ArgumentListExpression(new ConstantExpression(varName), right)
);
mce.setSourcePosition(left);
mce.setImplicitThis(false);
return transform(mce);
}
}
}
if (assignment && left instanceof VariableExpression && right instanceof ClosureExpression) {
VariableExpression var = (VariableExpression) left;
if ("modelTypes".equals(var.getName())) {
// template declaring its expected types from model directly
// modelTypes = {
// List items
// ...
// }
Map modelTypes = extractModelTypesFromClosureExpression((ClosureExpression)right);
Expression result = new EmptyExpression();
result.setSourcePosition(bin);
classNode.putNodeMetaData(MarkupTemplateEngine.MODELTYPES_ASTKEY, modelTypes);
return result;
}
}
return super.transform(bin);
}
private Map extractModelTypesFromClosureExpression(final ClosureExpression expression) {
Map model = new HashMap();
extractModelTypesFromStatement(expression.getCode(), model);
return model;
}
private void extractModelTypesFromStatement(final Statement code, final Map model) {
if (code instanceof BlockStatement) {
BlockStatement block = (BlockStatement) code;
for (Statement statement : block.getStatements()) {
extractModelTypesFromStatement(statement, model);
}
} else if (code instanceof ExpressionStatement) {
Expression expression = ((ExpressionStatement) code).getExpression();
if (expression instanceof DeclarationExpression) {
VariableExpression var = ((DeclarationExpression) expression).getVariableExpression();
model.put(var.getName(), var.getOriginType());
}
}
}
private Expression transformMethodCall(final MethodCallExpression exp) {
String name = exp.getMethodAsString();
if (exp.isImplicitThis() && "include".equals(name)) {
return tryTransformInclude(exp);
} else if (exp.isImplicitThis() && name.startsWith(":")) {
List args;
if (exp.getArguments() instanceof ArgumentListExpression) {
args = ((ArgumentListExpression) exp.getArguments()).getExpressions();
} else {
args = Collections.singletonList(exp.getArguments());
}
Expression newArguments = transform(new ArgumentListExpression(new ConstantExpression(name.substring(1)), new ArrayExpression(ClassHelper.OBJECT_TYPE, args)));
MethodCallExpression call = new MethodCallExpression(
new VariableExpression("this"),
"methodMissing",
newArguments
);
call.setImplicitThis(true);
call.setSafe(exp.isSafe());
call.setSpreadSafe(exp.isSpreadSafe());
call.setSourcePosition(exp);
return call;
} else if (name!=null && name.startsWith("$")) {
MethodCallExpression reformatted = new MethodCallExpression(
exp.getObjectExpression(),
name.substring(1),
exp.getArguments()
);
reformatted.setImplicitThis(exp.isImplicitThis());
reformatted.setSafe(exp.isSafe());
reformatted.setSpreadSafe(exp.isSpreadSafe());
reformatted.setSourcePosition(exp);
// wrap in a stringOf { ... } closure call
ClosureExpression clos = new ClosureExpression(Parameter.EMPTY_ARRAY, new ExpressionStatement(reformatted));
clos.setVariableScope(new VariableScope());
MethodCallExpression stringOf = new MethodCallExpression(new VariableExpression("this"),
"stringOf",
clos);
stringOf.setImplicitThis(true);
stringOf.setSourcePosition(reformatted);
return stringOf;
}
return super.transform(exp);
}
private Expression tryTransformInclude(final MethodCallExpression exp) {
Expression arguments = exp.getArguments();
if (arguments instanceof TupleExpression) {
List expressions = ((TupleExpression) arguments).getExpressions();
if (expressions.size() == 1 && expressions.get(0) instanceof MapExpression) {
MapExpression map = (MapExpression) expressions.get(0);
List entries = map.getMapEntryExpressions();
if (entries.size() == 1) {
MapEntryExpression mapEntry = entries.get(0);
Expression keyExpression = mapEntry.getKeyExpression();
try {
IncludeType includeType = IncludeType.valueOf(keyExpression.getText().toLowerCase());
MethodCallExpression call = new MethodCallExpression(
exp.getObjectExpression(),
includeType.getMethodName(),
new ArgumentListExpression(
mapEntry.getValueExpression()
)
);
call.setImplicitThis(true);
call.setSafe(exp.isSafe());
call.setSpreadSafe(exp.isSpreadSafe());
call.setSourcePosition(exp);
return call;
} catch (IllegalArgumentException e) {
// not a valid import type, do not modify the code
}
}
}
}
return super.transform(exp);
}
}