| /* |
| * Copyright 2005 Sascha Weinreuter |
| * |
| * 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 org.intellij.lang.xpath.xslt.validation; |
| |
| import com.intellij.lang.annotation.AnnotationHolder; |
| import com.intellij.openapi.util.TextRange; |
| import com.intellij.psi.PsiElement; |
| import com.intellij.psi.PsiFile; |
| import org.intellij.lang.xpath.XPathFile; |
| import org.intellij.lang.xpath.XPathTokenTypes; |
| import org.intellij.lang.xpath.psi.*; |
| import org.intellij.lang.xpath.xslt.context.Xslt2ContextProvider; |
| |
| // TODO: more detailed error descriptions |
| |
| @SuppressWarnings({"SimplifiableIfStatement"}) |
| class XsltPatternValidator { |
| private XsltPatternValidator() { |
| } |
| |
| public static void validate(AnnotationHolder annotationHolder, PsiFile file) { |
| final XPathExpression expression = ((XPathFile)file).getExpression(); |
| if (expression != null) { |
| if (!checkPattern(expression)) { |
| annotationHolder.createErrorAnnotation(expression, "Bad pattern"); |
| } |
| } else { |
| annotationHolder.createErrorAnnotation(TextRange.from(0, 1), "Missing pattern"); |
| } |
| } |
| |
| private static boolean checkPattern(XPathExpression element) { |
| if (element instanceof XPathBinaryExpression) { |
| final XPathBinaryExpression expression = (XPathBinaryExpression)element; |
| if (expression.getOperator() == XPathTokenTypes.UNION) { |
| if (checkPattern(expression.getLOperand()) && checkPattern(expression.getROperand())) { |
| return true; |
| } |
| } |
| } else if (element instanceof XPathLocationPath) { |
| return checkLocationPathPattern((XPathLocationPath)element); |
| } else if (element instanceof XPathFunctionCall) { |
| return checkIdKeyPattern(element); |
| } |
| return false; |
| } |
| |
| private static boolean checkLocationPathPattern(XPathLocationPath locationPath) { |
| final XPathStep step = locationPath.getFirstStep(); |
| // missing step is already flagged by parser |
| return step == null || checkStep(step); |
| } |
| |
| private static boolean checkStep(XPathStep step) { |
| XPathExpression prev = step.getPreviousStep(); |
| if (prev instanceof XPathFilterExpression) { |
| prev = ((XPathFilterExpression)prev).getExpression(); |
| if (prev != null && !(prev instanceof XPathStep)) { |
| // stuff like key('', '')[1]/xxx is invalid: "The filtered expression in a pattern must be a simple step" |
| return false; |
| } |
| } |
| |
| if (prev instanceof XPathStep) { |
| if (!checkStep((XPathStep)prev)) { |
| return false; |
| } |
| } else if (prev instanceof XPathFunctionCall) { |
| if (!checkIdKeyPattern(prev)) { |
| return false; |
| } |
| } else if (step.getStep() != null || prev != null) { |
| return false; |
| } |
| |
| final XPathAxisSpecifier axisSpecifier = step.getAxisSpecifier(); |
| if (axisSpecifier != null) { |
| if ((axisSpecifier.getAxis() == Axis.CHILD || axisSpecifier.getAxis() == Axis.ATTRIBUTE)) { |
| return true; |
| } |
| } else { |
| return true; |
| } |
| return false; |
| } |
| |
| private static boolean checkIdKeyPattern(PsiElement child) { |
| if (child instanceof XPathFunctionCall) { |
| final XPathFunctionCall call = (XPathFunctionCall)child; |
| final XPathExpression[] arguments = call.getArgumentList(); |
| if ("id".equals(call.getFunctionName())) { |
| if (arguments.length != 1) return false; |
| return isIdValue(arguments[0]) ; |
| } else if ("key".equals(call.getFunctionName())) { |
| if (arguments.length != 2) return false; |
| return arguments[0] instanceof XPathString && isKeyValue(arguments[1]); |
| } |
| } |
| return false; |
| } |
| |
| private static boolean isIdValue(XPathExpression argument) { |
| if (argument.getXPathContext() instanceof Xslt2ContextProvider) { |
| return argument instanceof XPathString || argument instanceof XPathVariableReference; |
| } else { |
| return argument instanceof XPathString; |
| } |
| } |
| |
| private static boolean isKeyValue(XPathExpression argument) { |
| if (argument.getXPathContext() instanceof Xslt2ContextProvider) { |
| return argument instanceof XPathString || argument instanceof XPathNumber || argument instanceof XPathVariableReference; |
| } else { |
| return argument instanceof XPathString; |
| } |
| } |
| } |