com.google.javascript.jscomp.JSDocInfoPrinter Maven / Gradle / Ivy
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Closure Compiler is a JavaScript optimizing compiler. It parses your
JavaScript, analyzes it, removes dead code and rewrites and minimizes
what's left. It also checks syntax, variable references, and types, and
warns about common JavaScript pitfalls. It is used in many of Google's
JavaScript apps, including Gmail, Google Web Search, Google Maps, and
Google Docs.
/*
* Copyright 2014 The Closure Compiler Authors.
*
* 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.javascript.jscomp;
import com.google.common.base.Joiner;
import com.google.common.collect.ImmutableList;
import com.google.common.collect.ImmutableMap;
import com.google.common.collect.Ordering;
import com.google.javascript.rhino.JSDocInfo;
import com.google.javascript.rhino.JSDocInfo.Visibility;
import com.google.javascript.rhino.JSTypeExpression;
import com.google.javascript.rhino.Node;
import com.google.javascript.rhino.Token;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
import java.util.Map;
import java.util.Set;
/**
* Prints a JSDocInfo, used for preserving type annotations in ES6 transpilation.
*
*/
public final class JSDocInfoPrinter {
private final boolean useOriginalName;
JSDocInfoPrinter(boolean useOriginalName) {
this.useOriginalName = useOriginalName;
}
public String print(JSDocInfo info) {
boolean multiline = false;
List parts = new ArrayList<>();
// order:
// export|public|private|package|protected
// abstract
// lends
// const
// final
// desc
// dict|struct|unrestricted
// constructor|interface|record
// extends
// implements
// this
// param
// return
// throws
// template
// override
// type|define|typedef|enum
// implicitCast
// suppress
// deprecated
// polymer
// polymerBehavior
// mixinFunction
parts.add("/**");
if (info.isExport()) {
parts.add("@export");
} else if (info.getVisibility() != null
&& info.getVisibility() != Visibility.INHERITED) {
parts.add("@" + info.getVisibility().toString().toLowerCase());
}
if (info.isAbstract()) {
parts.add("@abstract");
}
if (info.getLendsName() != null) {
parts.add("@lends {" + info.getLendsName() + "}");
}
if (info.isConstant() && !info.isDefine() && !info.isFinal()) {
parts.add("@const");
}
if (info.isFinal()) {
parts.add("@final");
}
String description = info.getDescription();
if (description != null) {
parts.add("@desc " + description + '\n');
}
if (info.makesDicts()) {
parts.add("@dict");
}
if (info.makesStructs()) {
parts.add("@struct");
}
if (info.makesUnrestricted()) {
parts.add("@unrestricted ");
}
if (info.isConstructor()) {
parts.add("@constructor");
}
if (info.isInterface() && !info.usesImplicitMatch()) {
parts.add("@interface");
}
if (info.isInterface() && info.usesImplicitMatch()) {
parts.add("@record");
}
if (info.hasBaseType()) {
multiline = true;
Node typeNode = stripBang(info.getBaseType().getRoot());
parts.add(buildAnnotationWithType("extends", typeNode));
}
for (JSTypeExpression type : info.getExtendedInterfaces()) {
multiline = true;
Node typeNode = stripBang(type.getRoot());
parts.add(buildAnnotationWithType("extends", typeNode));
}
for (JSTypeExpression type : info.getImplementedInterfaces()) {
multiline = true;
Node typeNode = stripBang(type.getRoot());
parts.add(buildAnnotationWithType("implements", typeNode));
}
if (info.hasThisType()) {
multiline = true;
Node typeNode = stripBang(info.getThisType().getRoot());
parts.add(buildAnnotationWithType("this", typeNode));
}
if (info.getParameterCount() > 0) {
multiline = true;
for (String name : info.getParameterNames()) {
parts.add("@param " + buildParamType(name, info.getParameterType(name)));
}
}
if (info.hasReturnType()) {
multiline = true;
parts.add(buildAnnotationWithType("return", info.getReturnType()));
}
if (!info.getThrownTypes().isEmpty()) {
parts.add(buildAnnotationWithType("throws", info.getThrownTypes().get(0)));
}
ImmutableList names = info.getTemplateTypeNames();
if (!names.isEmpty()) {
parts.add("@template " + Joiner.on(',').join(names));
multiline = true;
}
ImmutableMap typeTransformations = info.getTypeTransformations();
if (!typeTransformations.isEmpty()) {
multiline = true;
for (Map.Entry e : typeTransformations.entrySet()) {
String name = e.getKey();
String tranformationDefinition = new CodePrinter.Builder(e.getValue()).build();
parts.add("@template " + name + " := " + tranformationDefinition + " =:");
}
}
if (info.isOverride()) {
parts.add("@override");
}
if (info.hasType() && !info.isDefine()) {
if (info.isInlineType()) {
parts.add(typeNode(info.getType().getRoot()));
} else {
parts.add(buildAnnotationWithType("type", info.getType()));
}
}
if (info.isDefine()) {
parts.add(buildAnnotationWithType("define", info.getType()));
}
if (info.hasTypedefType()) {
parts.add(buildAnnotationWithType("typedef", info.getTypedefType()));
}
if (info.hasEnumParameterType()) {
parts.add(buildAnnotationWithType("enum", info.getEnumParameterType()));
}
if (info.isImplicitCast()) {
parts.add("@implicitCast");
}
Set suppressions = info.getSuppressions();
if (!suppressions.isEmpty()) {
// Print suppressions in sorted order to avoid non-deterministic output.
String[] arr = suppressions.toArray(new String[0]);
Arrays.sort(arr, Ordering.natural());
parts.add("@suppress {" + Joiner.on(',').join(arr) + "}");
multiline = true;
}
if (info.isDeprecated()) {
parts.add("@deprecated " + info.getDeprecationReason());
multiline = true;
}
if (info.isPolymer()) {
multiline = true;
parts.add("@polymer");
}
if (info.isPolymerBehavior()) {
multiline = true;
parts.add("@polymerBehavior");
}
if (info.isMixinFunction()) {
multiline = true;
parts.add("@mixinFunction");
}
if (info.isMixinClass()) {
multiline = true;
parts.add("@mixinClass");
}
if (info.isCustomElement()) {
multiline = true;
parts.add("@customElement");
}
parts.add("*/");
StringBuilder sb = new StringBuilder();
if (multiline) {
Joiner.on("\n ").appendTo(sb, parts);
} else {
Joiner.on(" ").appendTo(sb, parts);
}
sb.append((multiline) ? "\n" : " ");
return sb.toString();
}
private Node stripBang(Node typeNode) {
if (typeNode.getToken() == Token.BANG) {
typeNode = typeNode.getFirstChild();
}
return typeNode;
}
private String buildAnnotationWithType(String annotation, JSTypeExpression type) {
return buildAnnotationWithType(annotation, type.getRoot());
}
private String buildAnnotationWithType(String annotation, Node type) {
StringBuilder sb = new StringBuilder();
sb.append("@");
sb.append(annotation);
sb.append(" {");
appendTypeNode(sb, type);
sb.append("}");
return sb.toString();
}
private String buildParamType(String name, JSTypeExpression type) {
if (type != null) {
return "{" + typeNode(type.getRoot()) + "} " + name;
} else {
return name;
}
}
private String typeNode(Node typeNode) {
StringBuilder sb = new StringBuilder();
appendTypeNode(sb, typeNode);
return sb.toString();
}
private void appendTypeNode(StringBuilder sb, Node typeNode) {
if (useOriginalName && typeNode.getOriginalName() != null) {
sb.append(typeNode.getOriginalName());
return;
}
if (typeNode.getToken() == Token.BANG) {
sb.append("!");
appendTypeNode(sb, typeNode.getFirstChild());
} else if (typeNode.getToken() == Token.EQUALS) {
appendTypeNode(sb, typeNode.getFirstChild());
sb.append("=");
} else if (typeNode.getToken() == Token.PIPE) {
sb.append("(");
Node lastChild = typeNode.getLastChild();
for (Node child = typeNode.getFirstChild(); child != null; child = child.getNext()) {
appendTypeNode(sb, child);
if (child != lastChild) {
sb.append("|");
}
}
sb.append(")");
} else if (typeNode.getToken() == Token.ELLIPSIS) {
sb.append("...");
if (typeNode.hasChildren() && !typeNode.getFirstChild().isEmpty()) {
appendTypeNode(sb, typeNode.getFirstChild());
}
} else if (typeNode.getToken() == Token.STAR) {
sb.append("*");
} else if (typeNode.getToken() == Token.QMARK) {
sb.append("?");
if (typeNode.hasChildren()) {
appendTypeNode(sb, typeNode.getFirstChild());
}
} else if (typeNode.isFunction()) {
appendFunctionNode(sb, typeNode);
} else if (typeNode.getToken() == Token.LC) {
sb.append("{");
Node lb = typeNode.getFirstChild();
Node lastColon = lb.getLastChild();
for (Node colon = lb.getFirstChild(); colon != null; colon = colon.getNext()) {
if (colon.hasChildren()) {
sb.append(colon.getFirstChild().getString()).append(":");
appendTypeNode(sb, colon.getLastChild());
} else {
sb.append(colon.getString());
}
if (colon != lastColon) {
sb.append(",");
}
}
sb.append("}");
} else if (typeNode.isVoid()) {
sb.append("void");
} else {
if (typeNode.hasChildren()) {
sb.append(typeNode.getString())
.append("<");
Node child = typeNode.getFirstChild();
Node last = child.getLastChild();
for (Node type = child.getFirstChild(); type != null; type = type.getNext()) {
appendTypeNode(sb, type);
if (type != last) {
sb.append(",");
}
}
sb.append(">");
} else {
sb.append(typeNode.getString());
}
}
}
private void appendFunctionNode(StringBuilder sb, Node function) {
boolean hasNewOrThis = false;
sb.append("function(");
Node first = function.getFirstChild();
if (first.isNew()) {
sb.append("new:");
appendTypeNode(sb, first.getFirstChild());
hasNewOrThis = true;
} else if (first.isThis()) {
sb.append("this:");
appendTypeNode(sb, first.getFirstChild());
hasNewOrThis = true;
} else if (first.isEmpty()) {
sb.append(")");
return;
} else if (!first.isParamList()) {
sb.append("):");
appendTypeNode(sb, first);
return;
}
Node paramList = null;
if (first.isParamList()) {
paramList = first;
} else if (first.getNext().isParamList()) {
paramList = first.getNext();
}
if (paramList != null) {
boolean firstParam = true;
for (Node param : paramList.children()) {
if (!firstParam || hasNewOrThis) {
sb.append(",");
}
appendTypeNode(sb, param);
firstParam = false;
}
}
sb.append(")");
Node returnType = function.getLastChild();
if (!returnType.isEmpty()) {
sb.append(":");
appendTypeNode(sb, returnType);
}
}
}