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/*
* Copyright 2000-2014 JetBrains s.r.o.
*
* 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.codeInsight.folding.impl;
import com.intellij.lang.folding.FoldingDescriptor;
import com.intellij.lang.folding.NamedFoldingDescriptor;
import com.intellij.openapi.util.Couple;
import com.intellij.openapi.util.TextRange;
import com.intellij.openapi.util.text.StringUtil;
import com.intellij.psi.*;
import com.intellij.psi.tree.IElementType;
import com.intellij.psi.util.TypeConversionUtil;
import com.intellij.util.containers.ContainerUtil;
import org.jetbrains.annotations.NotNull;
import org.jetbrains.annotations.Nullable;
import java.util.List;
public class ParameterNameFoldingManager {
private static final int MIN_NAME_LENGTH_THRESHOLD = 3;
private static final int MIN_ARGS_TO_FOLD = 2;
private static final List<Couple<String>> COMMONLY_USED_PARAMETER_PAIR = ContainerUtil.newArrayList(
Couple.of("begin", "end"),
Couple.of("start", "end"),
Couple.of("first", "last"),
Couple.of("first", "second"),
Couple.of("from", "to"),
Couple.of("key", "value"),
Couple.of("min", "max")
);
private final PsiCallExpression myCallExpression;
private PsiExpression[] myCallArguments;
private PsiParameter[] myParameters;
public ParameterNameFoldingManager(@NotNull PsiCallExpression callExpression) {
myCallExpression = callExpression;
}
public static boolean isLiteralExpression(@Nullable PsiElement callArgument) {
if (callArgument instanceof PsiLiteralExpression)
return true;
if (callArgument instanceof PsiPrefixExpression) {
PsiPrefixExpression expr = (PsiPrefixExpression)callArgument;
IElementType tokenType = expr.getOperationTokenType();
return (JavaTokenType.MINUS.equals(tokenType)
|| JavaTokenType.PLUS.equals(tokenType)) && expr.getOperand() instanceof PsiLiteralExpression;
}
return false;
}
@Nullable
public PsiExpression[] getArguments(@NotNull PsiCallExpression call) {
PsiExpressionList callArgumentsList = call.getArgumentList();
return callArgumentsList != null ? callArgumentsList.getExpressions() : null;
}
@NotNull
public List<FoldingDescriptor> buildDescriptors() {
myCallArguments = getArguments(myCallExpression);
if (myCallArguments != null && myCallArguments.length >= MIN_ARGS_TO_FOLD && hasLiteralExpression(myCallArguments)) {
PsiMethod method = myCallExpression.resolveMethod();
if (method != null) {
myParameters = method.getParameterList().getParameters();
if (myParameters.length == myCallArguments.length) {
return buildDescriptorsForLiteralArguments();
}
}
}
return ContainerUtil.emptyList();
}
@NotNull
private List<FoldingDescriptor> buildDescriptorsForLiteralArguments() {
List<FoldingDescriptor> descriptors = ContainerUtil.newArrayList();
int i = 0;
while (i < myCallArguments.length) {
if (i + 1 < myCallArguments.length && isCommonlyNamedParameterPair(i, i + 1)) {
i += 2;
continue;
}
if (shouldInlineParameterName(i)) {
descriptors.add(createFoldingDescriptor(myCallArguments[i], myParameters[i]));
}
i++;
}
return descriptors;
}
@NotNull
private static NamedFoldingDescriptor createFoldingDescriptor(@NotNull PsiExpression callArgument, @NotNull PsiParameter methodParam) {
TextRange range = callArgument.getTextRange();
String placeholderText = methodParam.getName() + ": " + callArgument.getText();
return new NamedFoldingDescriptor(callArgument, range.getStartOffset(), range.getEndOffset(), null, placeholderText);
}
private boolean isCommonlyNamedParameterPair(int first, int second) {
assert first < myParameters.length && second < myParameters.length;
String firstParamName = myParameters[first].getName();
String secondParamName = myParameters[second].getName();
if (firstParamName == null || secondParamName == null) return false;
for (Couple<String> knownPair : COMMONLY_USED_PARAMETER_PAIR) {
if (StringUtil.containsIgnoreCase(firstParamName, knownPair.first)
&& StringUtil.containsIgnoreCase(secondParamName, knownPair.second)) {
return true;
}
}
return false;
}
private boolean shouldInlineParameterName(int paramIndex) {
PsiExpression argument = myCallArguments[paramIndex];
if (isLiteralExpression(argument) && argument.getType() != null) {
PsiParameter parameter = myParameters[paramIndex];
String paramName = parameter.getName();
if (paramName != null && paramName.length() >= MIN_NAME_LENGTH_THRESHOLD) {
return TypeConversionUtil.isAssignable(parameter.getType(), argument.getType());
}
}
return false;
}
private static boolean hasLiteralExpression(@NotNull PsiExpression[] arguments) {
for (PsiExpression argument : arguments) {
if (isLiteralExpression(argument)) return true;
}
return false;
}
}
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