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/*
* Copyright 2000-2013 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.indentation;
import com.intellij.lang.ASTNode;
import com.intellij.lang.PsiBuilder;
import com.intellij.lang.PsiParser;
import com.intellij.psi.tree.IElementType;
import com.intellij.util.containers.Stack;
import org.jetbrains.annotations.NotNull;
import org.jetbrains.annotations.Nullable;
/**
* @author oleg
*/
public abstract class IndentationParser implements PsiParser {
@NotNull
private final IElementType myEolTokenType;
@NotNull
private final IElementType myIndentTokenType;
@NotNull
private final IElementType myBlockElementType;
@NotNull
private final IElementType myDocumentType;
public IndentationParser(
@NotNull IElementType documentType,
@NotNull final IElementType blockElementType,
@NotNull final IElementType eolTokenType,
@NotNull final IElementType indentTokenType)
{
myDocumentType = documentType;
myBlockElementType = blockElementType;
myEolTokenType = eolTokenType;
myIndentTokenType = indentTokenType;
}
@Override
@NotNull
public final ASTNode parse(final IElementType root, final PsiBuilder builder) {
final PsiBuilder.Marker fileMarker = builder.mark();
final PsiBuilder.Marker documentMarker = builder.mark();
while (builder.getTokenType() == myEolTokenType) {
advanceLexer(builder);
}
final Stack<BlockInfo> stack = new Stack<BlockInfo>();
stack.push(new BlockInfo(0, builder.mark(), builder.getTokenType()));
PsiBuilder.Marker startLineMarker = null;
int currentIndent = 0;
boolean eolSeen = false;
while (!builder.eof()) {
final IElementType type = builder.getTokenType();
// EOL
if (type == myEolTokenType) {
// Handle variant with several EOLs
if (startLineMarker == null) {
startLineMarker = builder.mark();
}
eolSeen = true;
}
else {
if (type == myIndentTokenType) {
//noinspection ConstantConditions
currentIndent = builder.getTokenText().length();
}
else {
if (!eolSeen && !stack.isEmpty() && currentIndent > 0 && currentIndent < stack.peek().getIndent()) {
// sometimes we do not have EOL between indents
eolSeen = true;
}
if (eolSeen) {
if (startLineMarker != null) {
startLineMarker.rollbackTo();
startLineMarker = null;
}
// Close indentation blocks
while (!stack.isEmpty() && currentIndent < stack.peek().getIndent()) {
final BlockInfo blockInfo = stack.pop();
closeBlock(builder, blockInfo.getMarker(), blockInfo.getStartTokenType());
}
if (!stack.isEmpty()) {
final BlockInfo blockInfo = stack.peek();
if (currentIndent >= blockInfo.getIndent()) {
if (currentIndent == blockInfo.getIndent()) {
final BlockInfo info = stack.pop();
closeBlock(builder, info.getMarker(), info.getStartTokenType());
}
passEOLsAndIndents(builder);
stack.push(new BlockInfo(currentIndent, builder.mark(), type));
}
}
eolSeen = false;
currentIndent = 0;
}
}
}
advanceLexer(builder);
}
// Close all left opened markers
if (startLineMarker != null){
startLineMarker.drop();
}
while (!stack.isEmpty()){
final BlockInfo blockInfo = stack.pop();
closeBlock(builder, blockInfo.getMarker(), blockInfo.getStartTokenType());
}
documentMarker.done(myDocumentType);
fileMarker.done(root);
return builder.getTreeBuilt();
}
protected void closeBlock(final @NotNull PsiBuilder builder,
final @NotNull PsiBuilder.Marker marker,
final @Nullable IElementType startTokenType)
{
marker.done(myBlockElementType);
}
protected void advanceLexer(@NotNull PsiBuilder builder) {
builder.advanceLexer();
}
private void passEOLsAndIndents(@NotNull final PsiBuilder builder) {
IElementType tokenType = builder.getTokenType();
while (tokenType == myEolTokenType || tokenType == myIndentTokenType) {
builder.advanceLexer();
tokenType = builder.getTokenType();
}
}
private static final class BlockInfo {
private final int myIndent;
@NotNull
private final PsiBuilder.Marker myMarker;
@Nullable
private final IElementType myStartTokenType;
private BlockInfo(final int indent, final @NotNull PsiBuilder.Marker marker, final @Nullable IElementType type) {
myIndent = indent;
myMarker = marker;
myStartTokenType = type;
}
public int getIndent() {
return myIndent;
}
@NotNull
public PsiBuilder.Marker getMarker() {
return myMarker;
}
@Nullable
public IElementType getStartTokenType() {
return myStartTokenType;
}
}
}
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