com.google.common.css.compiler.passes.TemplateCompactPrinter Maven / Gradle / Ivy
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Closure Stylesheets is an extension to CSS that adds variables,
functions,
conditionals, and mixins to standard CSS. The tool also supports
minification, linting, RTL flipping, and CSS class renaming.
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/*
* Copyright 2010 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.common.css.compiler.passes;
import com.google.common.css.SourceCodeLocation;
import com.google.common.css.compiler.ast.CssAttributeSelectorNode;
import com.google.common.css.compiler.ast.CssBlockNode;
import com.google.common.css.compiler.ast.CssClassSelectorNode;
import com.google.common.css.compiler.ast.CssCombinatorNode;
import com.google.common.css.compiler.ast.CssCommentNode;
import com.google.common.css.compiler.ast.CssComponentNode;
import com.google.common.css.compiler.ast.CssCompositeValueNode;
import com.google.common.css.compiler.ast.CssConditionalBlockNode;
import com.google.common.css.compiler.ast.CssConditionalRuleNode;
import com.google.common.css.compiler.ast.CssConstantReferenceNode;
import com.google.common.css.compiler.ast.CssDeclarationNode;
import com.google.common.css.compiler.ast.CssDefinitionNode;
import com.google.common.css.compiler.ast.CssFontFaceNode;
import com.google.common.css.compiler.ast.CssForLoopRuleNode;
import com.google.common.css.compiler.ast.CssFunctionNode;
import com.google.common.css.compiler.ast.CssIdSelectorNode;
import com.google.common.css.compiler.ast.CssImportBlockNode;
import com.google.common.css.compiler.ast.CssImportRuleNode;
import com.google.common.css.compiler.ast.CssKeyListNode;
import com.google.common.css.compiler.ast.CssKeyNode;
import com.google.common.css.compiler.ast.CssKeyframeRulesetNode;
import com.google.common.css.compiler.ast.CssKeyframesNode;
import com.google.common.css.compiler.ast.CssMediaRuleNode;
import com.google.common.css.compiler.ast.CssMixinDefinitionNode;
import com.google.common.css.compiler.ast.CssMixinNode;
import com.google.common.css.compiler.ast.CssNode;
import com.google.common.css.compiler.ast.CssPageRuleNode;
import com.google.common.css.compiler.ast.CssPageSelectorNode;
import com.google.common.css.compiler.ast.CssPropertyValueNode;
import com.google.common.css.compiler.ast.CssProvideNode;
import com.google.common.css.compiler.ast.CssPseudoClassNode;
import com.google.common.css.compiler.ast.CssPseudoElementNode;
import com.google.common.css.compiler.ast.CssRequireNode;
import com.google.common.css.compiler.ast.CssRootNode;
import com.google.common.css.compiler.ast.CssRulesetNode;
import com.google.common.css.compiler.ast.CssSelectorListNode;
import com.google.common.css.compiler.ast.CssSelectorNode;
import com.google.common.css.compiler.ast.CssTree;
import com.google.common.css.compiler.ast.CssUnknownAtRuleNode;
import com.google.common.css.compiler.ast.CssValueNode;
import java.util.regex.Pattern;
/**
* Printer for templates, which outputs GSS with holes to be filled
* for references. In addition, the declaration boundaries are
* explicitly noted, so that a declaration can be removed if it ends
* up empty.
*
* @param type of chunk id objects
*
* @author [email protected] (Damian Gajda)
*/
public class TemplateCompactPrinter extends ChunkCompactPrinter {
public static final char REFERENCE_START = '\u0123';
public static final char REFERENCE_END = '\u0122';
public static final char REFERENCE_START_OLD = '$';
public static final char REFERENCE_END_OLD = '^';
public static final char DECLARATION_START = '\u0105';
public static final char DECLARATION_END = '\u0104';
public static final char RULE_START = '\u0118';
public static final char RULE_END = '\u0119';
private boolean preserveMarkedComments;
private static final Pattern LICENSE_ANNOTATION_PATTERN =
Pattern.compile(".*@license\\b.*", Pattern.DOTALL);
private static final Pattern PRESERVE_ANNOTATION_PATTERN =
Pattern.compile(".*@preserve\\b.*", Pattern.DOTALL);
// CodeBuffer with specific behavior for the printer
private static final class CodeBufferForTemplate extends CodeBuffer {
@Override
public void deleteLastCharIfCharIs(char ch) {
if (ch == ';' && getLastChar() == DECLARATION_END) {
deleteLastChars(2);
append(DECLARATION_END);
} else {
super.deleteLastCharIfCharIs(ch);
}
}
}
/**
* Create a template printer for a given chunk.
*
* @param tree CSS AST to be printed (with regard to a selected chunk)
* @param chunk the chunk selected for printing
*/
public TemplateCompactPrinter(CssTree tree, T chunk) {
super(tree, chunk, new CodeBufferForTemplate());
}
/**
* Whether special comments in the CSS nodes are preserved in the printed
* output. Currently supported special comments are annotated with one of the following:
* - @preserve
* - @license
* Comments marked with @license will cause a special "END OF LICENSED CSS FILE"
* comment to be inserted when the parser moves on to a new source file.
* Note: Comments layout is not guaranteed, since detailed position
* information in the input files is not preserved by the parser.
*/
public TemplateCompactPrinter setPreserveMarkedComments(boolean preserve) {
this.preserveMarkedComments = preserve;
return this;
}
@Override
protected void appendValueNode(CssValueNode node) {
if (node instanceof CssConstantReferenceNode) {
buffer.append(REFERENCE_START);
super.appendValueNode(node);
buffer.append(REFERENCE_END);
} else {
super.appendValueNode(node);
}
}
@Override
public boolean enterDeclaration(CssDeclarationNode declaration) {
maybeAppendComments(declaration);
buffer.append(DECLARATION_START);
return super.enterDeclaration(declaration);
}
@Override
public void leaveDeclaration(CssDeclarationNode declaration) {
super.leaveDeclaration(declaration);
buffer.append(DECLARATION_END);
}
@Override
public boolean enterRuleset(CssRulesetNode ruleset) {
maybeAppendComments(ruleset);
boolean printRuleset = super.enterRuleset(ruleset);
if (printRuleset) {
buffer.append(RULE_START);
}
return printRuleset;
}
@Override
public void leaveRuleset(CssRulesetNode ruleset) {
// only called if enterRuleset returns true
buffer.append(RULE_END);
super.leaveRuleset(ruleset);
}
@Override
public boolean enterMediaRule(CssMediaRuleNode media) {
maybeAppendComments(media);
buffer.append(RULE_START);
boolean printMediaRule = super.enterMediaRule(media);
if (!printMediaRule) {
buffer.deleteLastCharIfCharIs(RULE_START);
}
return printMediaRule;
}
@Override
public void leaveMediaRule(CssMediaRuleNode media) {
// only called if enterMediaRule returns true
super.leaveMediaRule(media);
buffer.append(RULE_END);
}
@Override
public boolean enterFontFace(CssFontFaceNode cssFontFaceNode) {
maybeAppendComments(cssFontFaceNode);
buffer.append(RULE_START);
boolean printFontFace = super.enterFontFace(cssFontFaceNode);
if (!printFontFace) {
buffer.deleteLastCharIfCharIs(RULE_START);
}
return printFontFace;
}
@Override
public void leaveFontFace(CssFontFaceNode cssFontFaceNode) {
// only called if enterFontFace returns true
super.leaveFontFace(cssFontFaceNode);
buffer.append(RULE_END);
}
@Override
public boolean enterKeyframeRuleset(CssKeyframeRulesetNode ruleset) {
maybeAppendComments(ruleset);
buffer.append(RULE_START);
boolean printKeyframeRuleset = super.enterKeyframeRuleset(ruleset);
if (!printKeyframeRuleset) {
buffer.deleteLastCharIfCharIs(RULE_START);
}
return printKeyframeRuleset;
}
@Override
public void leaveKeyframeRuleset(CssKeyframeRulesetNode ruleset) {
// only called if enterKeyframeRuleset returns true
super.leaveKeyframeRuleset(ruleset);
buffer.append(RULE_END);
}
@Override
public boolean enterPageRule(CssPageRuleNode node) {
maybeAppendComments(node);
buffer.append(RULE_START);
boolean printPageRule = super.enterPageRule(node);
if (!printPageRule) {
buffer.deleteLastCharIfCharIs(RULE_START);
}
return printPageRule;
}
@Override
public void leavePageRule(CssPageRuleNode node) {
// only called if enterPageRule returns true
super.leavePageRule(node);
buffer.append(RULE_END);
}
@Override
public boolean enterUnknownAtRule(CssUnknownAtRuleNode node) {
maybeAppendComments(node);
buffer.append(RULE_START);
boolean printUnknownAtRule = super.enterUnknownAtRule(node);
if (!printUnknownAtRule) {
buffer.deleteLastCharIfCharIs(RULE_START);
}
return printUnknownAtRule;
}
@Override
public void leaveUnknownAtRule(CssUnknownAtRuleNode node) {
// only called if enterUnknownAtRule returns true
super.leaveUnknownAtRule(node);
buffer.append(RULE_END);
}
@Override
public boolean enterImportRule(CssImportRuleNode node) {
maybeAppendComments(node);
buffer.append(RULE_START);
boolean printImportRule = super.enterImportRule(node);
if (!printImportRule) {
buffer.deleteLastCharIfCharIs(RULE_START);
}
return printImportRule;
}
@Override
public void leaveImportRule(CssImportRuleNode node) {
super.leaveImportRule(node);
buffer.append(RULE_END);
}
@Override
public boolean enterConditionalRule(CssConditionalRuleNode node) {
maybeAppendComments(node);
return super.enterConditionalRule(node);
}
/** Called before visiting a {@code CssPageSelectorNode}'s sub trees */
@Override
public boolean enterPageSelector(CssPageSelectorNode node) {
maybeAppendComments(node);
return super.enterPageSelector(node);
}
/**
* @return {@code true} if the contents of the rule should be visited,
* false otherwise. {@link #leaveDefinition(CssDefinitionNode)}
* will still be called.
*/
@Override
public boolean enterDefinition(CssDefinitionNode node) {
maybeAppendComments(node);
return super.enterDefinition(node);
}
/** Called before visiting a {@code CssComponentNode}'s sub trees */
@Override
public boolean enterComponent(CssComponentNode node) {
maybeAppendComments(node);
return super.enterComponent(node);
}
/** Called before visiting a {@code CssKeyframesNode}'s sub trees */
@Override
public boolean enterKeyframesRule(CssKeyframesNode node) {
maybeAppendComments(node);
return super.enterKeyframesRule(node);
}
/** Called before visiting a {@code CssMixinDefinitionNode}'s sub trees */
@Override
public boolean enterMixinDefinition(CssMixinDefinitionNode node) {
maybeAppendComments(node);
return super.enterMixinDefinition(node);
}
/** Called before visiting a {@code CssMixinNode}'s sub trees */
@Override
public boolean enterMixin(CssMixinNode node) {
maybeAppendComments(node);
return super.enterMixin(node);
}
/** Called before visiting a {@code CssRootNode}'s sub trees */
@Override
public boolean enterTree(CssRootNode root) {
maybeAppendComments(root);
return super.enterTree(root);
}
/** Called before visiting a {@code CssImportBlockNode}'s sub trees */
@Override
public boolean enterImportBlock(CssImportBlockNode block) {
maybeAppendComments(block);
return super.enterImportBlock(block);
}
/** Called before visiting a {@code CssBlockNode}'s sub trees */
@Override
public boolean enterBlock(CssBlockNode block) {
maybeAppendComments(block);
return super.enterBlock(block);
}
/** Called before visiting a {@code CssConditionalBlockNode}'s sub trees */
@Override
public boolean enterConditionalBlock(CssConditionalBlockNode block) {
maybeAppendComments(block);
return super.enterConditionalBlock(block);
}
/** Called before visiting a {@code CssSelectorListNode}'s sub trees */
@Override
public boolean enterSelectorBlock(CssSelectorListNode block) {
maybeAppendComments(block);
return super.enterSelectorBlock(block);
}
/** Called before visiting a {@code CssSelectorNode}'s sub trees */
@Override
public boolean enterSelector(CssSelectorNode selector) {
maybeAppendComments(selector);
return super.enterSelector(selector);
}
/** Called before visiting a {@code CssClassSelectorNode}'s sub trees */
@Override
public boolean enterClassSelector(CssClassSelectorNode classSelector) {
maybeAppendComments(classSelector);
return super.enterClassSelector(classSelector);
}
/** Called before visiting a {@code CssIdSelectorNode}'s sub trees */
@Override
public boolean enterIdSelector(CssIdSelectorNode idSelector) {
maybeAppendComments(idSelector);
return super.enterIdSelector(idSelector);
}
/** Called before visiting a {@code CssPseudoClassNode}'s sub trees */
@Override
public boolean enterPseudoClass(CssPseudoClassNode pseudoClass) {
maybeAppendComments(pseudoClass);
return super.enterPseudoClass(pseudoClass);
}
/** Called before visiting a {@code CssPseudoElementNode}'s sub trees */
@Override
public boolean enterPseudoElement(CssPseudoElementNode pseudoElement) {
maybeAppendComments(pseudoElement);
return super.enterPseudoElement(pseudoElement);
}
/** Called before visiting a {@code CssAttributeSelectorNode}'s sub trees */
@Override
public boolean enterAttributeSelector(CssAttributeSelectorNode attributeSelector) {
maybeAppendComments(attributeSelector);
return super.enterAttributeSelector(attributeSelector);
}
/** Called before visiting a {@code CssPropertyValueNode}'s sub trees */
@Override
public boolean enterPropertyValue(CssPropertyValueNode propertyValue) {
maybeAppendComments(propertyValue);
return super.enterPropertyValue(propertyValue);
}
/** Called before visiting a {@code CssValueNode} that is a
{@code CssCompositeValueNode} */
@Override
public boolean enterCompositeValueNode(CssCompositeValueNode value) {
maybeAppendComments(value);
return super.enterCompositeValueNode(value);
}
/** Called before visiting a {@code CssFunctionNode}'s sub trees */
@Override
public boolean enterFunctionNode(CssFunctionNode value) {
maybeAppendComments(value);
return super.enterFunctionNode(value);
}
/** Called before visiting a {@code CssFunctionNode}'s sub trees */
@Override
public boolean enterArgumentNode(CssValueNode value) {
maybeAppendComments(value);
return super.enterArgumentNode(value);
}
/** Called before visiting a {@code CssCombinatorNode}'s sub trees */
@Override
public boolean enterCombinator(CssCombinatorNode combinator) {
maybeAppendComments(combinator);
return super.enterCombinator(combinator);
}
/** Called before visiting a {@code CssKeyNode}'s sub trees */
@Override
public boolean enterKey(CssKeyNode key) {
maybeAppendComments(key);
return super.enterKey(key);
}
/** Called before visiting a {@code CssKeyListNode}'s sub trees */
@Override
public boolean enterKeyBlock(CssKeyListNode block) {
maybeAppendComments(block);
return super.enterKeyBlock(block);
}
@Override
public boolean enterValueNode(CssValueNode n) {
maybeAppendComments(n);
return super.enterValueNode(n);
}
@Override
public boolean enterForLoop(CssForLoopRuleNode node) {
maybeAppendComments(node);
return super.enterForLoop(node);
}
/** Called before visiting a {@code CssProvideNode} */
@Override
public boolean enterProvideNode(CssProvideNode node) {
maybeAppendComments(node);
return super.enterProvideNode(node);
}
/** Called before visiting a {@code CssRequireNode} */
@Override
public boolean enterRequireNode(CssRequireNode node) {
maybeAppendComments(node);
return super.enterRequireNode(node);
}
private String lastLicensedCommentSource = null;
private void maybeAppendComments(CssNode node) {
String newSourceLocation = fileNameForSourceCodeLocation(
node.getSourceCodeLocation());
// If we previously printed out a comment with a license and we're transitioning
// source files, print a END OF LICENSED CSS FILE comment.
if (lastLicensedCommentSource != null
&& newSourceLocation != null
&& !lastLicensedCommentSource.equals(newSourceLocation)) {
buffer.append("/* END OF LICENSED CSS FILE */\n");
lastLicensedCommentSource = null;
}
if (preserveMarkedComments && !node.getComments().isEmpty()) {
StringBuilder commentBuffer = new StringBuilder();
for (CssCommentNode c : node.getComments()) {
commentBuffer.append(c.getValue());
}
String comment = commentBuffer.toString();
boolean hasLicense = LICENSE_ANNOTATION_PATTERN.matcher(comment).matches();
if (hasLicense || PRESERVE_ANNOTATION_PATTERN.matcher(comment).matches()) {
buffer.startNewLine();
buffer.append(comment);
buffer.startNewLine();
if (hasLicense) {
lastLicensedCommentSource = newSourceLocation;
}
}
}
}
private String fileNameForSourceCodeLocation(SourceCodeLocation location) {
if (location == null || location.getSourceCode() == null) {
return null;
}
return location.getSourceCode().getFileName();
}
}