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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.template.emmet;
import com.intellij.codeInsight.template.CustomTemplateCallback;
import com.intellij.codeInsight.template.emmet.generators.ZenCodingGenerator;
import com.intellij.codeInsight.template.emmet.nodes.*;
import com.intellij.codeInsight.template.emmet.tokens.*;
import com.intellij.codeInsight.template.impl.TemplateImpl;
import org.jetbrains.annotations.Nullable;
import java.util.List;
/**
* User: zolotov
* Date: 1/25/13
*/
public abstract class EmmetParser {
private final List<ZenCodingToken> myTokens;
protected final CustomTemplateCallback myCallback;
protected final ZenCodingGenerator myGenerator;
private int myIndex = 0;
public EmmetParser(List<ZenCodingToken> tokens, CustomTemplateCallback callback, ZenCodingGenerator generator) {
myTokens = tokens;
myCallback = callback;
myGenerator = generator;
}
public int getIndex() {
return myIndex;
}
@Nullable
public ZenCodingNode parse() {
ZenCodingNode add = parseAddOrMore();
if (add == null) {
return null;
}
ZenCodingNode result = add;
while (true) {
ZenCodingToken token = getToken();
if (token != ZenCodingTokens.PIPE) {
return result;
}
advance();
token = getToken();
if (!(token instanceof IdentifierToken)) {
return null;
}
final String filterSuffix = ((IdentifierToken)token).getText();
if (ZenCodingUtil.checkFilterSuffix(filterSuffix)) {
result = new FilterNode(result, filterSuffix);
}
advance();
}
}
@Nullable
protected ZenCodingNode parseAddOrMore() {
ZenCodingNode mul = parseMul();
ZenCodingToken operationToken = getToken();
if (operationToken == ZenCodingTokens.OPENING_R_BRACKET) {
mul = new MoreOperationNode(notNullNode(mul), parseExpression());
operationToken = getToken();
}
if (!(operationToken instanceof OperationToken)) {
return mul;
}
char sign = ((OperationToken)operationToken).getSign();
if (sign == '^') {
return parseClimbUpOperation(mul);
}
if (sign == '+') {
advance();
ZenCodingNode add2 = parseAddOrMore();
if (add2 == null) {
return mul;
}
return new AddOperationNode(notNullNode(mul), add2);
}
if (sign == '>') {
return parseMoreOperation(mul);
}
return null;
}
protected ZenCodingNode parseClimbUpOperation(@Nullable ZenCodingNode leftPart) {
advance();
leftPart = notNullNode(leftPart);
ZenCodingNode rightPart = parseAddOrMore();
if (rightPart == null) {
return leftPart;
}
return new ClimbUpOperationNode(leftPart, rightPart);
}
protected ZenCodingNode parseMoreOperation(@Nullable ZenCodingNode leftPart) {
advance();
leftPart = notNullNode(leftPart);
ZenCodingNode rightPart = parseAddOrMore();
if (rightPart == null) {
return leftPart;
}
return new MoreOperationNode(leftPart, rightPart);
}
private static ZenCodingNode notNullNode(ZenCodingNode node) {
return node != null ? node : ZenEmptyNode.INSTANCE;
}
protected int advance() {
return myIndex++;
}
@Nullable
private ZenCodingNode parseMul() {
ZenCodingNode exp = parseExpression();
if (exp == null) {
return null;
}
ZenCodingToken operationToken = getToken();
if (!(operationToken instanceof OperationToken)) {
return exp;
}
if (((OperationToken)operationToken).getSign() != '*') {
return exp;
}
advance();
ZenCodingToken numberToken = getToken();
if (numberToken instanceof NumberToken) {
advance();
return new MulOperationNode(exp, ((NumberToken)numberToken).getNumber());
}
return new UnaryMulOperationNode(exp);
}
@Nullable
private ZenCodingNode parseExpression() {
ZenCodingToken token = getToken();
if (token == ZenCodingTokens.OPENING_R_BRACKET) {
advance();
ZenCodingNode add = parseAddOrMore();
if (add == null) {
return null;
}
ZenCodingToken closingBrace = getToken();
if (closingBrace != ZenCodingTokens.CLOSING_R_BRACKET) {
return null;
}
advance();
return add;
}
else if (token instanceof TextToken) {
advance();
return new TextNode((TextToken)token);
}
final ZenCodingNode templateNode = parseTemplate();
if (templateNode == null) {
return null;
}
token = getToken();
if (token instanceof TextToken) {
advance();
return new MoreOperationNode(templateNode, new TextNode((TextToken)token));
}
return templateNode;
}
@Nullable
protected ZenCodingNode parseTemplate() {
ZenCodingToken token = getToken();
if (!(token instanceof IdentifierToken)) {
return null;
}
String templateKey = ((IdentifierToken)token).getText();
advance();
TemplateImpl template = myCallback.findApplicableTemplate(templateKey);
if (template == null && !ZenCodingUtil.isXML11ValidQName(templateKey)) {
return null;
}
final TemplateToken templateToken = new TemplateToken(templateKey);
if (!setTemplate(templateToken, template)) {
return null;
}
return new TemplateNode(templateToken);
}
protected boolean setTemplate(final TemplateToken token, TemplateImpl template) {
if (template == null) {
template = myGenerator.createTemplateByKey(token.getKey());
}
if (template == null) {
return false;
}
return token.setTemplate(template, myCallback);
}
@Nullable
protected ZenCodingToken getToken() {
if (myIndex < myTokens.size()) {
return myTokens.get(myIndex);
}
return null;
}
}
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