/*
* Copyright 2013 The authors
* 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.intellij.lang.ognl.completion;
import com.intellij.codeInsight.TailType;
import com.intellij.codeInsight.completion.*;
import com.intellij.codeInsight.lookup.LookupElementBuilder;
import com.intellij.codeInsight.lookup.TailTypeDecorator;
import com.intellij.lang.ognl.OgnlTypes;
import com.intellij.lang.ognl.psi.*;
import com.intellij.openapi.project.DumbAware;
import com.intellij.patterns.PsiElementPattern;
import com.intellij.psi.PsiElement;
import com.intellij.psi.tree.TokenSet;
import com.intellij.util.ProcessingContext;
import org.jetbrains.annotations.NotNull;
import static com.intellij.lang.ognl.psi.OgnlKeyword.*;
import static com.intellij.patterns.PlatformPatterns.psiElement;
/**
* OGNL keyword completion.
*
* @author Yann Cébron
*/
public class OgnlKeywordCompletionContributor extends CompletionContributor implements DumbAware {
private static final PsiElementPattern.Capture<PsiElement> VARIABLE_EXPRESSION =
psiElement().inside(OgnlVariableExpression.class);
private static final PsiElementPattern.Capture<PsiElement> VARIABLE_ASSIGNMENT_EXPRESSION =
psiElement().inside(OgnlVariableAssignmentExpression.class);
private static final PsiElementPattern.Capture<PsiElement> AFTER_OPERATIONS =
psiElement().afterLeaf(psiElement().withElementType(OgnlTokenGroups.OPERATIONS));
private static final PsiElementPattern.Capture<PsiElement> AFTER_NEW =
psiElement().afterLeaf(psiElement().withElementType(OgnlTypes.NEW_KEYWORD));
private static final PsiElementPattern.Capture<PsiElement> AFTER_QUESTION =
psiElement().afterLeaf(psiElement().withElementType(OgnlTypes.QUESTION));
private static final PsiElementPattern.Capture<PsiElement> AFTER_COLON =
psiElement().afterLeaf(psiElement().withElementType(OgnlTypes.COLON));
private static final PsiElementPattern.Capture<PsiElement> AFTER_EXPRESSION =
psiElement().afterLeaf(psiElement().inside(OgnlExpression.class))
.andNot(AFTER_OPERATIONS)
.andNot(AFTER_QUESTION)
.andNot(AFTER_COLON)
.andNot(AFTER_NEW)
.andNot(VARIABLE_EXPRESSION)
.andNot(VARIABLE_ASSIGNMENT_EXPRESSION);
private static final PsiElementPattern.Capture<PsiElement> AFTER_IDENTIFIER =
psiElement().afterLeaf(psiElement().inside(OgnlReferenceExpression.class));
public OgnlKeywordCompletionContributor() {
installBinaryOperations();
installSequence();
installIdentifier();
installBooleanNull();
installNew();
}
private void installBinaryOperations() {
extendKeywordCompletion(AFTER_EXPRESSION,
SHL, SHR, USHR,
AND, BAND, OR, BOR, XOR,
EQ, NEQ, LT, LTE, GT, GTE);
}
private void installSequence() {
extendKeywordCompletion(AFTER_EXPRESSION,
NOT_IN, IN);
}
private void installIdentifier() {
extendKeywordCompletion(AFTER_IDENTIFIER,
INSTANCEOF);
}
private void installBooleanNull() {
final TokenSet precedingOperators =
TokenSet.create(OgnlTypes.EQUAL,
OgnlTypes.EQ_KEYWORD,
OgnlTypes.NOT_EQUAL,
OgnlTypes.NEQ_KEYWORD,
OgnlTypes.QUESTION,
OgnlTypes.COLON,
OgnlTypes.AND_KEYWORD,
OgnlTypes.AND_AND,
OgnlTypes.OR_KEYWORD,
OgnlTypes.OR_OR,
OgnlTypes.NEGATE,
OgnlTypes.NOT_KEYWORD,
OgnlTypes.EQ);
extendKeywordCompletion(psiElement().afterLeaf(psiElement().inside(OgnlExpression.class)
.withElementType(precedingOperators)),
FALSE, TRUE, NULL);
}
// TODO simplify -> expression with no text
private void installNew() {
extendKeywordCompletion(psiElement().atStartOf(psiElement(OgnlExpression.class))
.andNot(AFTER_OPERATIONS)
.andNot(AFTER_NEW), NEW);
}
private void extendKeywordCompletion(final PsiElementPattern.Capture<PsiElement> pattern,
final String... keywords) {
extend(CompletionType.BASIC,
pattern,
new CompletionProvider<CompletionParameters>() {
@Override
protected void addCompletions(@NotNull final CompletionParameters completionParameters,
final ProcessingContext processingContext,
@NotNull final CompletionResultSet completionResultSet) {
for (final String keyword : keywords) {
final LookupElementBuilder builder = LookupElementBuilder.create(keyword).bold();
completionResultSet.addElement(TailTypeDecorator.withTail(builder, TailType.SPACE));
}
}
});
}
}