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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.jetbrains.python.validation;
import com.intellij.lang.ASTNode;
import com.intellij.openapi.util.TextRange;
import com.intellij.openapi.util.text.StringUtil;
import com.jetbrains.python.psi.PyStringLiteralExpression;
import com.jetbrains.python.psi.impl.PyStringLiteralExpressionImpl;
import java.util.List;
/**
* Looks for well-formedness of string constants.
*
* @author dcheryasov
*/
public class StringLiteralQuotesAnnotator extends PyAnnotator {
public static final String MISSING_Q = "Missing closing quote";
private static final String TRIPLE_QUOTES = "\"\"\"";
private static final String TRIPLE_APOS = "'''";
public void visitPyStringLiteralExpression(final PyStringLiteralExpression node) {
List<ASTNode> stringNodes = node.getStringNodes();
for (ASTNode stringNode : stringNodes) {
boolean foundError;
String nodeText = stringNode.getText();
int index = PyStringLiteralExpressionImpl.getPrefixLength(nodeText);
String unprefixed = nodeText.substring(index);
if (StringUtil.startsWith(unprefixed, TRIPLE_QUOTES)) {
foundError = checkTripleQuotedString(stringNode, unprefixed, TRIPLE_QUOTES);
}
else if (StringUtil.startsWith(unprefixed, TRIPLE_APOS)) {
foundError = checkTripleQuotedString(stringNode, unprefixed, TRIPLE_APOS);
}
else {
foundError = checkQuotedString(stringNode, unprefixed);
}
if (foundError) break;
}
}
private boolean checkQuotedString(ASTNode stringNode, String nodeText) {
char firstQuote = nodeText.charAt(0);
int lastChar = nodeText.length()-1;
if (lastChar == 0 || nodeText.charAt(lastChar) != firstQuote ||
(nodeText.charAt(lastChar-1) == '\\' && (lastChar == 1 || nodeText.charAt(lastChar-2) != '\\'))) {
getHolder().createErrorAnnotation(stringNode, MISSING_Q + " [" + firstQuote + "]");
return true;
}
return false;
}
private boolean checkTripleQuotedString(ASTNode stringNode, String text, final String quotes) {
if (text.length() < 6 || !text.endsWith(quotes)) {
int startOffset = StringUtil.trimTrailing(stringNode.getText()).lastIndexOf('\n');
if (startOffset < 0) {
startOffset = stringNode.getTextRange().getStartOffset();
}
else {
startOffset = stringNode.getTextRange().getStartOffset() + startOffset + 1;
}
TextRange highlightRange = new TextRange(startOffset, stringNode.getTextRange().getEndOffset());
getHolder().createErrorAnnotation(highlightRange, "Missing closing triple quotes");
return true;
}
return false;
}
}
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