Author: markt
Date: Sun Jul 14 21:07:26 2013
New Revision: 1503056
URL: http://svn.apache.org/r1503056
Log:
Start to implement the lambda expression syntax. Very basic expressions work. I
expect further changes to be required for more complex expressions.
Includes the initial unit tests for this syntax.
Added:
tomcat/trunk/test/org/apache/el/parser/TestAstLambdaExpression.java (with
props)
Modified:
tomcat/trunk/java/org/apache/el/Messages.properties
tomcat/trunk/java/org/apache/el/parser/AstIdentifier.java
tomcat/trunk/java/org/apache/el/parser/AstLambdaExpression.java
tomcat/trunk/java/org/apache/el/parser/AstLambdaExpressionOrInvocation.java
Modified: tomcat/trunk/java/org/apache/el/Messages.properties
URL:
http://svn.apache.org/viewvc/tomcat/trunk/java/org/apache/el/Messages.properties?rev=1503056&r1=1503055&r2=1503056&view=diff
==============================================================================
--- tomcat/trunk/java/org/apache/el/Messages.properties (original)
+++ tomcat/trunk/java/org/apache/el/Messages.properties Sun Jul 14 21:07:26 2013
@@ -51,4 +51,7 @@ error.fnMapper.paramcount=Function ''{0}
error.context.null=ELContext was null
# Parser
-error.identifier.notjava=The identifier [{0}] is not a valid Java identifier
as required by section 1.19 of the EL specification (Identifier ::= Java
language identifier). This check can be disabled by setting the system property
org.apache.el.parser.SKIP_IDENTIFIER_CHECK to true.
\ No newline at end of file
+error.identifier.notjava=The identifier [{0}] is not a valid Java identifier
as required by section 1.19 of the EL specification (Identifier ::= Java
language identifier). This check can be disabled by setting the system property
org.apache.el.parser.SKIP_IDENTIFIER_CHECK to true.
+
+# AstLambdaExpression
+error.args.tooFew=Only [{0}] arguments were provided for a lambda expression
that requires at least [{1}]
Modified: tomcat/trunk/java/org/apache/el/parser/AstIdentifier.java
URL:
http://svn.apache.org/viewvc/tomcat/trunk/java/org/apache/el/parser/AstIdentifier.java?rev=1503056&r1=1503055&r2=1503056&view=diff
==============================================================================
--- tomcat/trunk/java/org/apache/el/parser/AstIdentifier.java (original)
+++ tomcat/trunk/java/org/apache/el/parser/AstIdentifier.java Sun Jul 14
21:07:26 2013
@@ -61,6 +61,12 @@ public final class AstIdentifier extends
@Override
public Object getValue(EvaluationContext ctx) throws ELException {
+ // Lambda parameters
+ if (ctx.isLambdaArgument(this.image)) {
+ return ctx.getLambdaArgument(this.image);
+ }
+
+ // Variable mapper
VariableMapper varMapper = ctx.getVariableMapper();
if (varMapper != null) {
ValueExpression expr = varMapper.resolveVariable(this.image);
@@ -68,6 +74,8 @@ public final class AstIdentifier extends
return expr.getValue(ctx.getELContext());
}
}
+
+ // EL Resolvers
ctx.setPropertyResolved(false);
Object result = ctx.getELResolver().getValue(ctx, null, this.image);
if (!ctx.isPropertyResolved()) {
Modified: tomcat/trunk/java/org/apache/el/parser/AstLambdaExpression.java
URL:
http://svn.apache.org/viewvc/tomcat/trunk/java/org/apache/el/parser/AstLambdaExpression.java?rev=1503056&r1=1503055&r2=1503056&view=diff
==============================================================================
--- tomcat/trunk/java/org/apache/el/parser/AstLambdaExpression.java (original)
+++ tomcat/trunk/java/org/apache/el/parser/AstLambdaExpression.java Sun Jul 14
21:07:26 2013
@@ -17,10 +17,53 @@
/* Generated By:JJTree: Do not edit this line. AstLambdaExpression.java
Version 4.3 */
package org.apache.el.parser;
+import java.util.HashMap;
+import java.util.Map;
+
+import javax.el.ELException;
+
+import org.apache.el.lang.EvaluationContext;
+import org.apache.el.util.MessageFactory;
+
public class AstLambdaExpression extends SimpleNode {
public AstLambdaExpression(int id) {
super(id);
}
+
+ @SuppressWarnings("null") // paramValues[i] can't be null due to checks
+ @Override
+ public Object invoke(EvaluationContext ctx, Class<?>[] paramTypes,
+ Object[] paramValues) throws ELException {
+
+ // Two children - the formal parameters and the expression
+ AstLambdaParameters formalParameters =
+ (AstLambdaParameters) children[0];
+
+ int paramCount = formalParameters.children.length;
+ int argCount = 0;
+ if (paramValues != null) {
+ argCount = paramValues.length;
+ }
+ if (paramCount > argCount) {
+ throw new ELException(MessageFactory.get("error.args.tooFew",
+ Integer.valueOf(argCount), Integer.valueOf(paramCount)));
+ }
+
+ // Build the argument map
+ Map<String,Object> lambdaArgumnents = new HashMap<>();
+ for (int i = 0; i < formalParameters.children.length; i++) {
+ lambdaArgumnents.put(formalParameters.children[i].getImage(),
+ paramValues[i]);
+ }
+
+ ctx.enterLambdaScope(lambdaArgumnents);
+
+ try {
+ return children[1].getValue(ctx);
+ } finally {
+ ctx.exitLambdaScope();
+ }
+ }
}
/* JavaCC - OriginalChecksum=071159eff10c8e15ec612c765ae4480a (do not edit
this line) */
Modified:
tomcat/trunk/java/org/apache/el/parser/AstLambdaExpressionOrInvocation.java
URL:
http://svn.apache.org/viewvc/tomcat/trunk/java/org/apache/el/parser/AstLambdaExpressionOrInvocation.java?rev=1503056&r1=1503055&r2=1503056&view=diff
==============================================================================
--- tomcat/trunk/java/org/apache/el/parser/AstLambdaExpressionOrInvocation.java
(original)
+++ tomcat/trunk/java/org/apache/el/parser/AstLambdaExpressionOrInvocation.java
Sun Jul 14 21:07:26 2013
@@ -17,10 +17,33 @@
/* Generated By:JJTree: Do not edit this line.
AstLambdaExpressionOrInvocation.java Version 4.3 */
package org.apache.el.parser;
-public
-class AstLambdaExpressionOrInvocation extends SimpleNode {
- public AstLambdaExpressionOrInvocation(int id) {
- super(id);
- }
+import javax.el.ELException;
+
+import org.apache.el.lang.EvaluationContext;
+
+public class AstLambdaExpressionOrInvocation extends SimpleNode {
+
+ public AstLambdaExpressionOrInvocation(int id) {
+ super(id);
+ }
+
+
+ @Override
+ public Object getValue(EvaluationContext ctx) throws ELException {
+
+ if (children.length == 2) {
+ AstLambdaExpression lambdaExpression =
+ (AstLambdaExpression) children[0];
+
+
+ Object[] args =
+ ((AstMethodParameters) children[1]).getParameters(ctx);
+
+ return lambdaExpression.invoke(ctx, null, args);
+ }
+
+ // TODO Auto-generated method stub
+ return super.getValue(ctx);
+ }
}
/* JavaCC - OriginalChecksum=6b3dd15b31540457a41bd55974037ed9 (do not edit
this line) */
Added: tomcat/trunk/test/org/apache/el/parser/TestAstLambdaExpression.java
URL:
http://svn.apache.org/viewvc/tomcat/trunk/test/org/apache/el/parser/TestAstLambdaExpression.java?rev=1503056&view=auto
==============================================================================
--- tomcat/trunk/test/org/apache/el/parser/TestAstLambdaExpression.java (added)
+++ tomcat/trunk/test/org/apache/el/parser/TestAstLambdaExpression.java Sun Jul
14 21:07:26 2013
@@ -0,0 +1,32 @@
+/*
+ * 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 org.apache.el.parser;
+
+import javax.el.ELProcessor;
+
+import org.junit.Assert;
+import org.junit.Test;
+
+public class TestAstLambdaExpression {
+
+ @Test
+ public void testSpec01() {
+ ELProcessor processor = new ELProcessor();
+ Object result = processor.getValue("(x->x+1)(1)", Integer.class);
+ Assert.assertEquals(Integer.valueOf(2), result);
+ }
+}
Propchange: tomcat/trunk/test/org/apache/el/parser/TestAstLambdaExpression.java
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