| /* |
| * Copyright 2014 Google Inc. |
| * |
| * 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.google.gwt.resources.converter; |
| |
| import com.google.gwt.core.ext.TreeLogger; |
| import com.google.gwt.core.ext.TreeLogger.Type; |
| import com.google.gwt.resources.css.ast.Context; |
| import com.google.gwt.resources.css.ast.CssProperty; |
| import com.google.gwt.resources.css.ast.CssProperty.FunctionValue; |
| import com.google.gwt.resources.css.ast.CssProperty.IdentValue; |
| import com.google.gwt.resources.css.ast.CssProperty.ListValue; |
| import com.google.gwt.resources.css.ast.CssProperty.Value; |
| import com.google.gwt.resources.css.ast.CssRule; |
| import com.google.gwt.resources.css.ast.CssVisitor; |
| import com.google.gwt.thirdparty.guava.common.base.Preconditions; |
| import com.google.gwt.thirdparty.guava.common.collect.Sets; |
| |
| import java.util.ArrayList; |
| import java.util.List; |
| import java.util.Locale; |
| import java.util.Set; |
| import java.util.regex.Matcher; |
| import java.util.regex.Pattern; |
| |
| /** |
| * Converts upper case strings used in properties to lowercase if they are not defined |
| * with a proper @def statement. |
| */ |
| public class UndefinedConstantVisitor extends CssVisitor { |
| |
| private final Set<String> gssContantNames; |
| private final Pattern pattern = Pattern.compile("^[A-Z_][A-Z_0-9]+$"); |
| private final Set<String> propertyNamesToSkip = |
| Sets.newHashSet("filter", "-ms-filter", "font-family"); |
| private final boolean lenient; |
| private final TreeLogger treeLogger; |
| |
| public UndefinedConstantVisitor(Set<String> gssContantNames, boolean lenient, |
| TreeLogger treeLogger) { |
| this.gssContantNames = gssContantNames; |
| this.lenient = lenient; |
| this.treeLogger = treeLogger; |
| } |
| |
| @Override |
| public boolean visit(CssRule x, Context ctx) { |
| List<CssProperty> properties = x.getProperties(); |
| for (CssProperty cssProperty : properties) { |
| String cssPropertyName = cssProperty.getName(); |
| if (propertyNamesToSkip.contains(cssPropertyName)) { |
| continue; |
| } |
| |
| // for logging purpose |
| String selector = x.getSelectors().toString(); |
| |
| ListValue listValue = visitListValue(cssProperty.getValues(), cssPropertyName, selector); |
| |
| cssProperty.setValue(listValue); |
| } |
| |
| return false; |
| } |
| |
| private ListValue visitListValue(ListValue values, String cssPropertyName, String selector) { |
| Preconditions.checkNotNull(values, "values cannot be null"); |
| |
| List<Value> cssPropertyValues = values.getValues(); |
| List<Value> newValues = new ArrayList<Value>(cssPropertyValues.size()); |
| |
| for (Value value : cssPropertyValues) { |
| if (value.isListValue() != null) { |
| newValues.add(visitListValue(value.isListValue(), cssPropertyName, selector)); |
| |
| } else if (value.isFunctionValue() != null) { |
| FunctionValue functionValue = value.isFunctionValue(); |
| ListValue listValue = visitListValue(functionValue.getValues(), cssPropertyName, |
| selector); |
| |
| newValues.add(new FunctionValue(functionValue.getName(), listValue)); |
| |
| } else if (value.isIdentValue() != null) { |
| newValues.add(visitIdentValue(value.isIdentValue(), cssPropertyName, selector)); |
| |
| } else { |
| newValues.add(value); |
| } |
| } |
| |
| return new ListValue(newValues); |
| } |
| |
| private Value visitIdentValue(IdentValue identValue, String cssPropertyName, String selector) { |
| Matcher matcher = pattern.matcher(identValue.getIdent()); |
| |
| if (matcher.matches()) { |
| String upperCaseString = matcher.group(); |
| if (!gssContantNames.contains(upperCaseString)) { |
| treeLogger.log(Type.WARN, "Property '" + cssPropertyName + "' from rule '" |
| + selector + "' uses an undefined constant: " + upperCaseString); |
| if (lenient) { |
| treeLogger.log(Type.WARN, "turning '" + upperCaseString + |
| "' to lower case. This is probably not what you wanted here in the " + |
| "first place!"); |
| return new IdentValue(upperCaseString.toLowerCase(Locale.US)); |
| } else { |
| throw new Css2GssConversionException("Found undefined constant in input. " |
| + cssPropertyName + "' from rule '" + selector + "' undefined constant: " + |
| upperCaseString); |
| } |
| } |
| } |
| |
| return identValue; |
| } |
| } |