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/*
* Copyright 2007 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.parsing;
import static com.google.common.base.Preconditions.checkArgument;
import static com.google.common.base.Preconditions.checkState;
import com.google.common.annotations.VisibleForTesting;
import com.google.common.base.Ascii;
import com.google.common.base.CharMatcher;
import com.google.common.base.Splitter;
import com.google.common.collect.ImmutableSet;
import com.google.javascript.jscomp.parsing.Config.LanguageMode;
import com.google.javascript.rhino.ErrorReporter;
import com.google.javascript.rhino.IR;
import com.google.javascript.rhino.JSDocInfo;
import com.google.javascript.rhino.JSDocInfo.Visibility;
import com.google.javascript.rhino.JSDocInfoBuilder;
import com.google.javascript.rhino.JSTypeExpression;
import com.google.javascript.rhino.Node;
import com.google.javascript.rhino.SimpleErrorReporter;
import com.google.javascript.rhino.StaticSourceFile;
import com.google.javascript.rhino.Token;
import com.google.javascript.rhino.TokenStream;
import com.google.javascript.rhino.TokenUtil;
import java.util.ArrayList;
import java.util.HashSet;
import java.util.List;
import java.util.Map;
import java.util.Set;
/**
* A parser for JSDoc comments.
*
* @author [email protected] (Nick Santos)
*/
// TODO(nicksantos): Unify all the JSDocInfo stuff into one package, instead of
// spreading it across multiple packages.
public final class JsDocInfoParser {
@VisibleForTesting
public static final String BAD_TYPE_WIKI_LINK =
" See https://github.com/google/closure-compiler/wiki/Bad-Type-Annotation for"
+ " more information.";
private final JsDocTokenStream stream;
private final JSDocInfoBuilder jsdocBuilder;
private final ErrorReporter errorReporter;
// Use a template node for properties set on all nodes to minimize the
// memory footprint associated with these (similar to IRFactory).
private final Node templateNode;
private void addParserWarning(String messageId, String messageArg) {
addParserWarning(messageId, messageArg, stream.getLineno(), stream.getCharno());
}
private void addParserWarning(String messageId, String messageArg, int lineno, int charno) {
errorReporter.warning(
SimpleErrorReporter.getMessage1(messageId, messageArg), getSourceName(), lineno, charno);
}
private void addParserWarning(String messageId) {
addParserWarning(messageId, stream.getLineno(), stream.getCharno());
}
private void addParserWarning(String messageId, int lineno, int charno) {
errorReporter.warning(
SimpleErrorReporter.getMessage0(messageId), getSourceName(), lineno, charno);
}
private void addTypeWarning(String messageId, String messageArg) {
addTypeWarning(messageId, messageArg, stream.getLineno(), stream.getCharno());
}
private void addTypeWarning(String messageId, String messageArg, int lineno, int charno) {
errorReporter.warning(
"Bad type annotation. " + SimpleErrorReporter.getMessage1(messageId, messageArg)
+ BAD_TYPE_WIKI_LINK,
getSourceName(),
lineno,
charno);
}
private void addTypeWarning(String messageId) {
addTypeWarning(messageId, stream.getLineno(), stream.getCharno());
}
private void addTypeWarning(String messageId, int lineno, int charno) {
errorReporter.warning(
"Bad type annotation. " + SimpleErrorReporter.getMessage0(messageId)
+ BAD_TYPE_WIKI_LINK,
getSourceName(),
lineno,
charno);
}
private void addMissingTypeWarning(int lineno, int charno) {
errorReporter.warning("Missing type declaration.", getSourceName(), lineno, charno);
}
// The DocInfo with the fileoverview tag for the whole file.
private JSDocInfo fileOverviewJSDocInfo = null;
private State state;
private final Map annotations;
private final Set suppressionNames;
private final boolean preserveWhitespace;
private static final Set modifiesAnnotationKeywords =
ImmutableSet.of("this", "arguments");
private static final Set idGeneratorAnnotationKeywords =
ImmutableSet.of("unique", "consistent", "stable", "mapped", "xid");
private JSDocInfoBuilder fileLevelJsDocBuilder;
/**
* Sets the JsDocBuilder for the file-level (root) node of this parse. The
* parser uses the builder to append any preserve annotations it encounters
* in JsDoc comments.
*
* @param fileLevelJsDocBuilder
*/
void setFileLevelJsDocBuilder(
JSDocInfoBuilder fileLevelJsDocBuilder) {
this.fileLevelJsDocBuilder = fileLevelJsDocBuilder;
}
/**
* Sets the file overview JSDocInfo, in order to warn about multiple uses of
* the @fileoverview tag in a file.
*/
void setFileOverviewJSDocInfo(JSDocInfo fileOverviewJSDocInfo) {
this.fileOverviewJSDocInfo = fileOverviewJSDocInfo;
}
public StaticSourceFile getSourceFile() {
return templateNode.getStaticSourceFile();
}
private enum State {
SEARCHING_ANNOTATION,
SEARCHING_NEWLINE,
NEXT_IS_ANNOTATION
}
JsDocInfoParser(JsDocTokenStream stream,
String comment,
int commentPosition,
Node templateNode,
Config config,
ErrorReporter errorReporter) {
this.stream = stream;
boolean parseDocumentation = config.jsDocParsingMode().shouldParseDescriptions();
this.jsdocBuilder = new JSDocInfoBuilder(parseDocumentation);
if (comment != null) {
this.jsdocBuilder.recordOriginalCommentString(comment);
this.jsdocBuilder.recordOriginalCommentPosition(commentPosition);
}
this.annotations = config.annotations();
this.suppressionNames = config.suppressionNames();
this.preserveWhitespace = config.jsDocParsingMode().shouldPreserveWhitespace();
this.errorReporter = errorReporter;
this.templateNode = templateNode == null ? IR.script() : templateNode;
}
private String getSourceName() {
StaticSourceFile sourceFile = getSourceFile();
return sourceFile == null ? null : sourceFile.getName();
}
/**
* Parse a description as a {@code @type}.
*/
public JSDocInfo parseInlineTypeDoc() {
skipEOLs();
JsDocToken token = next();
int lineno = stream.getLineno();
int startCharno = stream.getCharno();
Node typeAst = parseParamTypeExpression(token);
recordTypeNode(lineno, startCharno, typeAst, token == JsDocToken.LEFT_CURLY);
JSTypeExpression expr = createJSTypeExpression(typeAst);
if (expr != null) {
jsdocBuilder.recordType(expr);
jsdocBuilder.recordInlineType();
return retrieveAndResetParsedJSDocInfo();
}
return null;
}
private void recordTypeNode(int lineno, int startCharno, Node typeAst,
boolean matchingLC) {
if (typeAst != null) {
int endLineno = stream.getLineno();
int endCharno = stream.getCharno();
jsdocBuilder.markTypeNode(
typeAst, lineno, startCharno, endLineno, endCharno, matchingLC);
}
}
/**
* Parses a string containing a JsDoc type declaration, returning the
* type if the parsing succeeded or {@code null} if it failed.
*/
public static Node parseTypeString(String typeString) {
JsDocInfoParser parser = getParser(typeString);
return parser.parseTopLevelTypeExpression(parser.next());
}
/**
* Parses a string containing a JsDoc declaration, returning the entire JSDocInfo
* if the parsing succeeded or {@code null} if it failed.
*/
public static JSDocInfo parseJsdoc(String toParse) {
JsDocInfoParser parser = getParser(toParse);
parser.parse();
return parser.retrieveAndResetParsedJSDocInfo();
}
private static JsDocInfoParser getParser(String toParse) {
Config config =
Config.builder()
.setLanguageMode(LanguageMode.ECMASCRIPT3)
.setStrictMode(Config.StrictMode.SLOPPY)
.build();
JsDocInfoParser parser = new JsDocInfoParser(
new JsDocTokenStream(toParse),
toParse,
0,
null,
config,
NullErrorReporter.forOldRhino());
return parser;
}
/**
* Parses a {@link JSDocInfo} object. This parsing method reads all tokens
* returned by the {@link JsDocTokenStream#getJsDocToken()} method until the
* {@link JsDocToken#EOC} is returned.
*
* @return {@code true} if JSDoc information was correctly parsed,
* {@code false} otherwise
*/
boolean parse() {
state = State.SEARCHING_ANNOTATION;
skipEOLs();
JsDocToken token = next();
// Always record that we have a comment.
if (jsdocBuilder.shouldParseDocumentation()) {
ExtractionInfo blockInfo = extractBlockComment(token);
token = blockInfo.token;
if (!blockInfo.string.isEmpty()) {
jsdocBuilder.recordBlockDescription(blockInfo.string);
}
} else {
if (token != JsDocToken.ANNOTATION &&
token != JsDocToken.EOC) {
// Mark that there was a description, but don't bother marking
// what it was.
jsdocBuilder.recordBlockDescription("");
}
}
return parseHelperLoop(token, new ArrayList());
}
/**
* Important comments begin with /*! They are treated as license blocks, but no further JSDoc
* parsing is performed
*/
void parseImportantComment() {
state = State.SEARCHING_ANNOTATION;
skipEOLs();
JsDocToken token = next();
ExtractionInfo info = extractMultilineComment(token, WhitespaceOption.PRESERVE, false, true);
// An extra space is added by the @license annotation
// so we need to add one here so they will be identical
String license = " " + info.string;
if (fileLevelJsDocBuilder != null) {
fileLevelJsDocBuilder.addLicense(license);
} else if (jsdocBuilder.shouldParseDocumentation()) {
jsdocBuilder.recordBlockDescription(license);
} else {
jsdocBuilder.recordBlockDescription("");
}
}
private boolean parseHelperLoop(JsDocToken token,
List extendedTypes) {
while (true) {
switch (token) {
case ANNOTATION:
if (state == State.SEARCHING_ANNOTATION) {
state = State.SEARCHING_NEWLINE;
token = parseAnnotation(token, extendedTypes);
} else {
token = next();
}
break;
case EOC:
boolean success = true;
// TODO(johnlenz): It should be a parse error to have an @extends
// or similiar annotations in a file overview block.
checkExtendedTypes(extendedTypes);
if (hasParsedFileOverviewDocInfo()) {
fileOverviewJSDocInfo = retrieveAndResetParsedJSDocInfo();
Visibility visibility = fileOverviewJSDocInfo.getVisibility();
switch (visibility) {
case PRIVATE: // fallthrough
case PROTECTED:
// PRIVATE and PROTECTED are not allowed in @fileoverview JsDoc.
addParserWarning(
"msg.bad.fileoverview.visibility.annotation",
Ascii.toLowerCase(visibility.toString()));
success = false;
break;
default:
// PACKAGE, PUBLIC, and (implicitly) INHERITED are allowed
// in @fileoverview JsDoc.
break;
}
}
return success;
case EOF:
// discard any accumulated information
jsdocBuilder.build();
addParserWarning("msg.unexpected.eof");
checkExtendedTypes(extendedTypes);
return false;
case EOL:
if (state == State.SEARCHING_NEWLINE) {
state = State.SEARCHING_ANNOTATION;
}
token = next();
break;
default:
if (token == JsDocToken.STAR && state == State.SEARCHING_ANNOTATION) {
token = next();
} else {
state = State.SEARCHING_NEWLINE;
token = eatTokensUntilEOL();
}
break;
}
}
}
private JsDocToken parseAnnotation(JsDocToken token,
List extendedTypes) {
// JSTypes are represented as Rhino AST nodes, and then resolved later.
JSTypeExpression type;
int lineno = stream.getLineno();
int charno = stream.getCharno();
String annotationName = stream.getString();
Annotation annotation = annotations.get(annotationName);
if (annotation == null || annotationName.isEmpty()) {
addParserWarning("msg.bad.jsdoc.tag", annotationName);
} else {
// Mark the beginning of the annotation.
jsdocBuilder.markAnnotation(annotationName, lineno, charno);
switch (annotation) {
case NG_INJECT:
if (jsdocBuilder.isNgInjectRecorded()) {
addParserWarning("msg.jsdoc.nginject.extra");
} else {
jsdocBuilder.recordNgInject(true);
}
return eatUntilEOLIfNotAnnotation();
case ABSTRACT:
if (!jsdocBuilder.recordAbstract()) {
addTypeWarning("msg.jsdoc.incompat.type");
}
return eatUntilEOLIfNotAnnotation();
case AUTHOR:
if (jsdocBuilder.shouldParseDocumentation()) {
ExtractionInfo authorInfo = extractSingleLineBlock();
String author = authorInfo.string;
if (author.isEmpty()) {
addParserWarning("msg.jsdoc.authormissing");
} else {
jsdocBuilder.addAuthor(author);
}
token = authorInfo.token;
} else {
token = eatUntilEOLIfNotAnnotation();
}
return token;
case CONSISTENTIDGENERATOR:
if (!jsdocBuilder.recordConsistentIdGenerator()) {
addParserWarning("msg.jsdoc.consistidgen");
}
return eatUntilEOLIfNotAnnotation();
case UNRESTRICTED:
if (!jsdocBuilder.recordUnrestricted()) {
addTypeWarning("msg.jsdoc.incompat.type");
}
return eatUntilEOLIfNotAnnotation();
case STRUCT:
if (!jsdocBuilder.recordStruct()) {
addTypeWarning("msg.jsdoc.incompat.type");
}
return eatUntilEOLIfNotAnnotation();
case DICT:
if (!jsdocBuilder.recordDict()) {
addTypeWarning("msg.jsdoc.incompat.type");
}
return eatUntilEOLIfNotAnnotation();
case CONSTRUCTOR:
if (!jsdocBuilder.recordConstructor()) {
if (jsdocBuilder.isInterfaceRecorded()) {
addTypeWarning("msg.jsdoc.interface.constructor");
} else {
addTypeWarning("msg.jsdoc.incompat.type");
}
}
return eatUntilEOLIfNotAnnotation();
case RECORD:
if (!jsdocBuilder.recordImplicitMatch()) {
addTypeWarning("msg.jsdoc.record");
}
return eatUntilEOLIfNotAnnotation();
case DEPRECATED:
if (!jsdocBuilder.recordDeprecated()) {
addParserWarning("msg.jsdoc.deprecated");
}
// Find the reason/description, if any.
ExtractionInfo reasonInfo = extractMultilineTextualBlock(token);
String reason = reasonInfo.string;
if (reason.length() > 0) {
jsdocBuilder.recordDeprecationReason(reason);
}
token = reasonInfo.token;
return token;
case INTERFACE:
if (!jsdocBuilder.recordInterface()) {
if (jsdocBuilder.isConstructorRecorded()) {
addTypeWarning("msg.jsdoc.interface.constructor");
} else {
addTypeWarning("msg.jsdoc.incompat.type");
}
}
return eatUntilEOLIfNotAnnotation();
case DESC:
if (jsdocBuilder.isDescriptionRecorded()) {
addParserWarning("msg.jsdoc.desc.extra");
return eatUntilEOLIfNotAnnotation();
} else {
ExtractionInfo descriptionInfo =
extractMultilineTextualBlock(token);
String description = descriptionInfo.string;
jsdocBuilder.recordDescription(description);
token = descriptionInfo.token;
return token;
}
case FILE_OVERVIEW:
String fileOverview = "";
if (jsdocBuilder.shouldParseDocumentation() && !lookAheadForAnnotation()) {
ExtractionInfo fileOverviewInfo = extractMultilineTextualBlock(
token, getWhitespaceOption(WhitespaceOption.TRIM), false);
fileOverview = fileOverviewInfo.string;
token = fileOverviewInfo.token;
} else {
token = eatUntilEOLIfNotAnnotation();
}
if (!jsdocBuilder.recordFileOverview(fileOverview)) {
addParserWarning("msg.jsdoc.fileoverview.extra");
}
return token;
case LICENSE:
case PRESERVE:
// Always use PRESERVE for @license and @preserve blocks.
ExtractionInfo preserveInfo = extractMultilineTextualBlock(
token, WhitespaceOption.PRESERVE, true);
String preserve = preserveInfo.string;
if (preserve.length() > 0) {
if (fileLevelJsDocBuilder != null) {
fileLevelJsDocBuilder.addLicense(preserve);
}
}
token = preserveInfo.token;
return token;
case ENUM:
token = next();
lineno = stream.getLineno();
charno = stream.getCharno();
type = null;
if (token != JsDocToken.EOL && token != JsDocToken.EOC) {
Node typeNode = parseAndRecordTypeNode(token);
if (typeNode != null && typeNode.isString()) {
String typeName = typeNode.getString();
if (!typeName.equals("number") && !typeName.equals("string")
&& !typeName.equals("boolean")) {
typeNode = wrapNode(Token.BANG, typeNode);
}
}
type = createJSTypeExpression(typeNode);
} else {
restoreLookAhead(token);
}
if (type == null) {
type = createJSTypeExpression(newStringNode("number"));
}
if (!jsdocBuilder.recordEnumParameterType(type)) {
addTypeWarning("msg.jsdoc.incompat.type", lineno, charno);
}
return eatUntilEOLIfNotAnnotation();
case EXPOSE:
if (!jsdocBuilder.recordExpose()) {
addParserWarning("msg.jsdoc.expose");
}
return eatUntilEOLIfNotAnnotation();
case EXTERNS:
if (!jsdocBuilder.recordExterns()) {
addParserWarning("msg.jsdoc.externs");
}
return eatUntilEOLIfNotAnnotation();
case TYPE_SUMMARY:
if (!jsdocBuilder.recordTypeSummary()) {
addParserWarning("msg.jsdoc.typesummary");
}
return eatUntilEOLIfNotAnnotation();
case EXTENDS:
case IMPLEMENTS:
skipEOLs();
token = next();
lineno = stream.getLineno();
charno = stream.getCharno();
boolean matchingRc = false;
if (token == JsDocToken.LEFT_CURLY) {
token = next();
matchingRc = true;
}
if (token == JsDocToken.STRING) {
Node typeNode = parseAndRecordTypeNameNode(token, lineno, charno, matchingRc);
lineno = stream.getLineno();
charno = stream.getCharno();
typeNode = wrapNode(Token.BANG, typeNode);
type = createJSTypeExpression(typeNode);
if (annotation == Annotation.EXTENDS) {
// record the extended type, check later
extendedTypes.add(new ExtendedTypeInfo(type, stream.getLineno(), stream.getCharno()));
} else {
checkState(annotation == Annotation.IMPLEMENTS);
if (!jsdocBuilder.recordImplementedInterface(type)) {
addTypeWarning("msg.jsdoc.implements.duplicate", lineno, charno);
}
}
token = next();
if (matchingRc) {
if (token != JsDocToken.RIGHT_CURLY) {
addTypeWarning("msg.jsdoc.missing.rc");
} else {
token = next();
}
} else if (token != JsDocToken.EOL
&& token != JsDocToken.EOF
&& token != JsDocToken.EOC) {
addTypeWarning("msg.end.annotation.expected");
}
} else {
addTypeWarning("msg.no.type.name", lineno, charno);
}
token = eatUntilEOLIfNotAnnotation(token);
return token;
case HIDDEN:
if (!jsdocBuilder.recordHiddenness()) {
addParserWarning("msg.jsdoc.hidden");
}
return eatUntilEOLIfNotAnnotation();
case LENDS:
skipEOLs();
matchingRc = false;
if (match(JsDocToken.LEFT_CURLY)) {
token = next();
matchingRc = true;
}
if (match(JsDocToken.STRING)) {
token = next();
if (!jsdocBuilder.recordLends(stream.getString())) {
addTypeWarning("msg.jsdoc.lends.incompatible");
}
} else {
addTypeWarning("msg.jsdoc.lends.missing");
}
if (matchingRc && !match(JsDocToken.RIGHT_CURLY)) {
addTypeWarning("msg.jsdoc.missing.rc");
}
return eatUntilEOLIfNotAnnotation();
case MEANING:
ExtractionInfo meaningInfo = extractMultilineTextualBlock(token);
String meaning = meaningInfo.string;
token = meaningInfo.token;
if (!jsdocBuilder.recordMeaning(meaning)) {
addParserWarning("msg.jsdoc.meaning.extra");
}
return token;
case NO_COMPILE:
if (!jsdocBuilder.recordNoCompile()) {
addParserWarning("msg.jsdoc.nocompile");
}
return eatUntilEOLIfNotAnnotation();
case NO_COLLAPSE:
if (!jsdocBuilder.recordNoCollapse()) {
addParserWarning("msg.jsdoc.nocollapse");
}
return eatUntilEOLIfNotAnnotation();
case NO_INLINE:
if (!jsdocBuilder.recordNoInline()) {
addParserWarning("msg.jsdoc.noinline");
}
return eatUntilEOLIfNotAnnotation();
case NOT_IMPLEMENTED:
return eatUntilEOLIfNotAnnotation();
case INHERIT_DOC:
case OVERRIDE:
if (!jsdocBuilder.recordOverride()) {
addTypeWarning("msg.jsdoc.override");
}
return eatUntilEOLIfNotAnnotation();
case POLYMER:
if (jsdocBuilder.isPolymerRecorded()) {
addParserWarning("msg.jsdoc.polymer.extra");
} else {
jsdocBuilder.recordPolymer();
}
return eatUntilEOLIfNotAnnotation();
case POLYMER_BEHAVIOR:
if (jsdocBuilder.isPolymerBehaviorRecorded()) {
addParserWarning("msg.jsdoc.polymerBehavior.extra");
} else {
jsdocBuilder.recordPolymerBehavior();
}
return eatUntilEOLIfNotAnnotation();
case CUSTOM_ELEMENT:
if (jsdocBuilder.isCustomElementRecorded()) {
addParserWarning("msg.jsdoc.customElement.extra");
} else {
jsdocBuilder.recordCustomElement();
}
return eatUntilEOLIfNotAnnotation();
case MIXIN_CLASS:
if (jsdocBuilder.isMixinClassRecorded()) {
addParserWarning("msg.jsdoc.mixinClass.extra");
} else {
jsdocBuilder.recordMixinClass();
}
return eatUntilEOLIfNotAnnotation();
case MIXIN_FUNCTION:
if (jsdocBuilder.isMixinFunctionRecorded()) {
addParserWarning("msg.jsdoc.mixinFunction.extra");
} else {
jsdocBuilder.recordMixinFunction();
}
return eatUntilEOLIfNotAnnotation();
case THROWS: {
skipEOLs();
token = next();
lineno = stream.getLineno();
charno = stream.getCharno();
type = null;
if (token == JsDocToken.LEFT_CURLY) {
type = createJSTypeExpression(
parseAndRecordTypeNode(token));
if (type == null) {
// parsing error reported during recursive descent
// recovering parsing
return eatUntilEOLIfNotAnnotation();
}
}
// *Update* the token to that after the type annotation.
token = current();
// Save the throw type.
jsdocBuilder.recordThrowType(type);
boolean isAnnotationNext = lookAheadForAnnotation();
// Find the throw's description (if applicable).
if (jsdocBuilder.shouldParseDocumentation() && !isAnnotationNext) {
ExtractionInfo descriptionInfo =
extractMultilineTextualBlock(token);
String description = descriptionInfo.string;
if (description.length() > 0) {
jsdocBuilder.recordThrowDescription(type, description);
}
token = descriptionInfo.token;
} else {
token = eatUntilEOLIfNotAnnotation();
}
return token;
}
case PARAM:
skipEOLs();
token = next();
lineno = stream.getLineno();
charno = stream.getCharno();
type = null;
boolean hasParamType = false;
if (token == JsDocToken.LEFT_CURLY) {
type = createJSTypeExpression(
parseAndRecordParamTypeNode(token));
if (type == null) {
// parsing error reported during recursive descent
// recovering parsing
return eatUntilEOLIfNotAnnotation();
}
skipEOLs();
token = next();
lineno = stream.getLineno();
charno = stream.getCharno();
hasParamType = true;
}
String name = null;
boolean isBracketedParam = JsDocToken.LEFT_SQUARE == token;
if (isBracketedParam) {
token = next();
}
if (JsDocToken.STRING != token) {
addTypeWarning("msg.missing.variable.name", lineno, charno);
} else {
if (!hasParamType) {
addMissingTypeWarning(stream.getLineno(), stream.getCharno());
}
name = stream.getString();
if (isBracketedParam) {
token = next();
// Throw out JsDocToolkit's "default" parameter
// annotation. It makes no sense under our type
// system.
if (JsDocToken.EQUALS == token) {
token = next();
if (JsDocToken.STRING == token) {
token = next();
}
}
if (JsDocToken.RIGHT_SQUARE != token) {
reportTypeSyntaxWarning("msg.jsdoc.missing.rb");
} else if (type != null) {
// Make the type expression optional, if it isn't
// already.
type = JSTypeExpression.makeOptionalArg(type);
}
}
// We do not handle the JsDocToolkit method
// for handling properties of params, so if the param name has a DOT
// in it, report a warning and throw it out.
// See https://github.com/google/closure-compiler/issues/499
if (!TokenStream.isJSIdentifier(name)) {
addParserWarning("msg.invalid.variable.name", name, lineno, charno);
name = null;
} else if (!jsdocBuilder.recordParameter(name, type)) {
if (jsdocBuilder.hasParameter(name)) {
addTypeWarning("msg.dup.variable.name", name, lineno, charno);
} else {
addTypeWarning("msg.jsdoc.incompat.type", name, lineno, charno);
}
}
}
if (name == null) {
token = eatUntilEOLIfNotAnnotation(token);
return token;
}
jsdocBuilder.markName(name, templateNode, lineno, charno);
// Find the parameter's description (if applicable).
if (jsdocBuilder.shouldParseDocumentation()
&& token != JsDocToken.ANNOTATION) {
ExtractionInfo paramDescriptionInfo =
extractMultilineTextualBlock(token);
String paramDescription = paramDescriptionInfo.string;
if (paramDescription.length() > 0) {
jsdocBuilder.recordParameterDescription(name,
paramDescription);
}
token = paramDescriptionInfo.token;
} else if (token != JsDocToken.EOC && token != JsDocToken.EOF) {
token = eatUntilEOLIfNotAnnotation();
}
return token;
case NO_SIDE_EFFECTS:
if (!jsdocBuilder.recordNoSideEffects()) {
addParserWarning("msg.jsdoc.nosideeffects");
}
return eatUntilEOLIfNotAnnotation();
case MODIFIES:
token = parseModifiesTag(next());
return token;
case IMPLICIT_CAST:
if (!jsdocBuilder.recordImplicitCast()) {
addTypeWarning("msg.jsdoc.implicitcast");
}
return eatUntilEOLIfNotAnnotation();
case SEE:
if (jsdocBuilder.shouldParseDocumentation()) {
ExtractionInfo referenceInfo = extractSingleLineBlock();
String reference = referenceInfo.string;
if (reference.isEmpty()) {
addParserWarning("msg.jsdoc.seemissing");
} else {
jsdocBuilder.addReference(reference);
}
token = referenceInfo.token;
} else {
token = eatUntilEOLIfNotAnnotation();
}
return token;
case STABLEIDGENERATOR:
if (!jsdocBuilder.recordStableIdGenerator()) {
addParserWarning("msg.jsdoc.stableidgen");
}
return eatUntilEOLIfNotAnnotation();
case SUPPRESS:
token = parseSuppressTag(next());
return token;
case TEMPLATE: {
int templateLineno = stream.getLineno();
int templateCharno = stream.getCharno();
// Always use TRIM for template TTL expressions.
ExtractionInfo templateInfo =
extractMultilineTextualBlock(token, WhitespaceOption.TRIM, false);
String templateString = templateInfo.string;
// TTL stands for type transformation language
// TODO(lpino): This delimiter needs to be further discussed
String ttlStartDelimiter = ":=";
String ttlEndDelimiter = "=:";
String templateNames;
String typeTransformationExpr = "";
boolean isTypeTransformation = false;
boolean validTypeTransformation = true;
// Detect if there is a type transformation
if (!templateString.contains(ttlStartDelimiter)) {
// If there is no type transformation take the first line
if (templateString.contains("\n")) {
templateNames =
templateString.substring(0, templateString.indexOf('\n'));
} else {
templateNames = templateString;
}
} else {
// Split the part with the template type names
int ttlStartIndex = templateString.indexOf(ttlStartDelimiter);
templateNames = templateString.substring(0, ttlStartIndex);
// Check if the type transformation expression ends correctly
if (!templateString.contains(ttlEndDelimiter)) {
validTypeTransformation = false;
addTypeWarning(
"msg.jsdoc.typetransformation.missing.delimiter",
templateLineno,
templateCharno);
} else {
isTypeTransformation = true;
// Split the part of the type transformation
int ttlEndIndex = templateString.indexOf(ttlEndDelimiter);
typeTransformationExpr = templateString.substring(
ttlStartIndex + ttlStartDelimiter.length(),
ttlEndIndex).trim();
}
}
// Obtain the template type names
List names = Splitter.on(',')
.trimResults()
.splitToList(templateNames);
if (names.size() == 1 && names.get(0).isEmpty()) {
addTypeWarning("msg.jsdoc.templatemissing", templateLineno, templateCharno);
} else {
for (String typeName : names) {
if (!validTemplateTypeName(typeName)) {
addTypeWarning(
"msg.jsdoc.template.invalid.type.name", templateLineno, templateCharno);
} else if (!isTypeTransformation) {
if (!jsdocBuilder.recordTemplateTypeName(typeName)) {
addTypeWarning(
"msg.jsdoc.template.name.declared.twice", templateLineno, templateCharno);
}
}
}
}
if (isTypeTransformation) {
// A type transformation must be associated to a single type name
if (names.size() > 1) {
addTypeWarning(
"msg.jsdoc.typetransformation.with.multiple.names",
templateLineno, templateCharno);
}
if (typeTransformationExpr.isEmpty()) {
validTypeTransformation = false;
addTypeWarning(
"msg.jsdoc.typetransformation.expression.missing",
templateLineno,
templateCharno);
}
// Build the AST for the type transformation
if (validTypeTransformation) {
TypeTransformationParser ttlParser =
new TypeTransformationParser(typeTransformationExpr,
getSourceFile(), errorReporter, templateLineno, templateCharno);
// If the parsing was successful store the type transformation
if (ttlParser.parseTypeTransformation()
&& !jsdocBuilder.recordTypeTransformation(
names.get(0), ttlParser.getTypeTransformationAst())) {
addTypeWarning(
"msg.jsdoc.template.name.declared.twice", templateLineno, templateCharno);
}
}
}
token = templateInfo.token;
return token;
}
case IDGENERATOR:
token = parseIdGeneratorTag(next());
return token;
case WIZACTION:
if (!jsdocBuilder.recordWizaction()) {
addParserWarning("msg.jsdoc.wizaction");
}
return eatUntilEOLIfNotAnnotation();
case DISPOSES:
{
ExtractionInfo templateInfo = extractSingleLineBlock();
List names = Splitter.on(',')
.trimResults()
.splitToList(templateInfo.string);
if (names.isEmpty() || names.get(0).isEmpty()) {
addTypeWarning("msg.jsdoc.disposeparameter.missing");
} else if (!jsdocBuilder.recordDisposesParameter(names)) {
addTypeWarning("msg.jsdoc.disposeparameter.error");
}
token = templateInfo.token;
return token;
}
case VERSION:
ExtractionInfo versionInfo = extractSingleLineBlock();
String version = versionInfo.string;
if (version.isEmpty()) {
addParserWarning("msg.jsdoc.versionmissing");
} else {
if (!jsdocBuilder.recordVersion(version)) {
addParserWarning("msg.jsdoc.extraversion");
}
}
token = versionInfo.token;
return token;
case CONSTANT:
case FINAL:
case DEFINE:
case EXPORT:
case RETURN:
case PACKAGE:
case PRIVATE:
case PROTECTED:
case PUBLIC:
case THIS:
case TYPE:
case TYPEDEF:
lineno = stream.getLineno();
charno = stream.getCharno();
Node typeNode = null;
boolean hasType = lookAheadForType();
boolean isAlternateTypeAnnotation =
annotation == Annotation.PACKAGE
|| annotation == Annotation.PRIVATE
|| annotation == Annotation.PROTECTED
|| annotation == Annotation.PUBLIC
|| annotation == Annotation.CONSTANT
|| annotation == Annotation.FINAL
|| annotation == Annotation.EXPORT;
boolean canSkipTypeAnnotation =
isAlternateTypeAnnotation || annotation == Annotation.RETURN;
type = null;
if (annotation == Annotation.RETURN && !hasType) {
addMissingTypeWarning(stream.getLineno(), stream.getCharno());
}
if (hasType || !canSkipTypeAnnotation) {
skipEOLs();
token = next();
typeNode = parseAndRecordTypeNode(token);
if (annotation == Annotation.THIS) {
typeNode = wrapNode(Token.BANG, typeNode);
}
type = createJSTypeExpression(typeNode);
}
// The error was reported during recursive descent
// recovering parsing
boolean hasError = type == null && !canSkipTypeAnnotation;
if (!hasError) {
// Record types for @type.
// If the @package, @private, @protected, or @public annotations
// have a type attached, pretend that they actually wrote:
// @type {type}\n@private
// This will have some weird behavior in some cases
// (for example, @private can now be used as a type-cast),
// but should be mostly OK.
if (((type != null && isAlternateTypeAnnotation) || annotation == Annotation.TYPE)
&& !jsdocBuilder.recordType(type)) {
addTypeWarning("msg.jsdoc.incompat.type", lineno, charno);
}
boolean isAnnotationNext = lookAheadForAnnotation();
switch (annotation) {
case CONSTANT:
if (!jsdocBuilder.recordConstancy()) {
addParserWarning("msg.jsdoc.const");
}
break;
case FINAL:
if (!jsdocBuilder.recordFinality()) {
addTypeWarning("msg.jsdoc.final");
}
break;
case DEFINE:
if (!jsdocBuilder.recordDefineType(type)) {
addParserWarning("msg.jsdoc.define", lineno, charno);
}
if (!isAnnotationNext) {
return recordDescription(token);
}
break;
case EXPORT:
if (!jsdocBuilder.recordExport()) {
addParserWarning("msg.jsdoc.export", lineno, charno);
} else if (!jsdocBuilder.recordVisibility(Visibility.PUBLIC)) {
addParserWarning("msg.jsdoc.extra.visibility", lineno, charno);
}
if (!isAnnotationNext) {
return recordDescription(token);
}
break;
case PRIVATE:
if (!jsdocBuilder.recordVisibility(Visibility.PRIVATE)) {
addParserWarning("msg.jsdoc.extra.visibility", lineno, charno);
}
if (!isAnnotationNext) {
return recordDescription(token);
}
break;
case PACKAGE:
if (!jsdocBuilder.recordVisibility(Visibility.PACKAGE)) {
addParserWarning("msg.jsdoc.extra.visibility", lineno, charno);
}
if (!isAnnotationNext) {
return recordDescription(token);
}
break;
case PROTECTED:
if (!jsdocBuilder.recordVisibility(Visibility.PROTECTED)) {
addParserWarning("msg.jsdoc.extra.visibility", lineno, charno);
}
if (!isAnnotationNext) {
return recordDescription(token);
}
break;
case PUBLIC:
if (!jsdocBuilder.recordVisibility(Visibility.PUBLIC)) {
addParserWarning("msg.jsdoc.extra.visibility", lineno, charno);
}
if (!isAnnotationNext) {
return recordDescription(token);
}
break;
case RETURN:
if (type == null) {
type = createJSTypeExpression(newNode(Token.QMARK));
}
if (!jsdocBuilder.recordReturnType(type)) {
addTypeWarning("msg.jsdoc.incompat.type", lineno, charno);
break;
}
// TODO(johnlenz): The extractMultilineTextualBlock method
// and friends look directly at the stream, regardless of
// last token read, so we don't want to read the first
// "STRING" out of the stream.
// Find the return's description (if applicable).
if (jsdocBuilder.shouldParseDocumentation()
&& !isAnnotationNext) {
ExtractionInfo returnDescriptionInfo =
extractMultilineTextualBlock(token);
String returnDescription =
returnDescriptionInfo.string;
if (returnDescription.length() > 0) {
jsdocBuilder.recordReturnDescription(
returnDescription);
}
token = returnDescriptionInfo.token;
} else {
token = eatUntilEOLIfNotAnnotation();
}
return token;
case THIS:
if (!jsdocBuilder.recordThisType(type)) {
addTypeWarning("msg.jsdoc.incompat.type", lineno, charno);
}
break;
case TYPEDEF:
if (!jsdocBuilder.recordTypedef(type)) {
addTypeWarning("msg.jsdoc.incompat.type", lineno, charno);
}
break;
default:
break;
}
}
return eatUntilEOLIfNotAnnotation();
}
}
return next();
}
/**
* The types in @template annotations must contain only letters, digits, and underscores.
*/
private static boolean validTemplateTypeName(String name) {
return !name.isEmpty()
&& CharMatcher.javaLetterOrDigit().or(CharMatcher.is('_')).matchesAllOf(name);
}
/**
* Records a marker's description if there is one available and record it in
* the current marker.
*/
private JsDocToken recordDescription(JsDocToken token) {
// Find marker's description (if applicable).
if (jsdocBuilder.shouldParseDocumentation()) {
ExtractionInfo descriptionInfo = extractMultilineTextualBlock(token);
token = descriptionInfo.token;
} else {
token = eatTokensUntilEOL(token);
}
return token;
}
private void checkExtendedTypes(List extendedTypes) {
for (ExtendedTypeInfo typeInfo : extendedTypes) {
// If interface, record the multiple extended interfaces
if (jsdocBuilder.isInterfaceRecorded()) {
if (!jsdocBuilder.recordExtendedInterface(typeInfo.type)) {
addParserWarning("msg.jsdoc.extends.duplicate", typeInfo.lineno, typeInfo.charno);
}
} else {
if (!jsdocBuilder.recordBaseType(typeInfo.type)) {
addTypeWarning("msg.jsdoc.incompat.type", typeInfo.lineno, typeInfo.charno);
}
}
}
}
/**
* Parse a {@code @suppress} tag of the form
* {@code @suppress{warning1|warning2}}.
*
* @param token The current token.
*/
private JsDocToken parseSuppressTag(JsDocToken token) {
if (token != JsDocToken.LEFT_CURLY) {
addParserWarning("msg.jsdoc.suppress");
return token;
} else {
Set suppressions = new HashSet<>();
while (true) {
if (match(JsDocToken.STRING)) {
String name = stream.getString();
if (!suppressionNames.contains(name)) {
addParserWarning("msg.jsdoc.suppress.unknown", name);
}
suppressions.add(stream.getString());
token = next();
} else {
addParserWarning("msg.jsdoc.suppress");
return token;
}
if (match(JsDocToken.PIPE, JsDocToken.COMMA)) {
token = next();
} else {
break;
}
}
if (!match(JsDocToken.RIGHT_CURLY)) {
addParserWarning("msg.jsdoc.suppress");
} else {
token = next();
if (!jsdocBuilder.recordSuppressions(suppressions)) {
addParserWarning("msg.jsdoc.suppress.duplicate");
}
}
return eatUntilEOLIfNotAnnotation();
}
}
/**
* Parse a {@code @modifies} tag of the form
* {@code @modifies{this|arguments|param}}.
*
* @param token The current token.
*/
private JsDocToken parseModifiesTag(JsDocToken token) {
if (token == JsDocToken.LEFT_CURLY) {
Set modifies = new HashSet<>();
while (true) {
if (match(JsDocToken.STRING)) {
String name = stream.getString();
if (!modifiesAnnotationKeywords.contains(name)
&& !jsdocBuilder.hasParameter(name)) {
addParserWarning("msg.jsdoc.modifies.unknown", name);
}
modifies.add(stream.getString());
token = next();
} else {
addParserWarning("msg.jsdoc.modifies");
return token;
}
if (match(JsDocToken.PIPE)) {
token = next();
} else {
break;
}
}
if (!match(JsDocToken.RIGHT_CURLY)) {
addParserWarning("msg.jsdoc.modifies");
} else {
token = next();
if (!jsdocBuilder.recordModifies(modifies)) {
addParserWarning("msg.jsdoc.modifies.duplicate");
}
}
}
return token;
}
/**
* Parse a {@code @idgenerator} tag of the form
* {@code @idgenerator} or
* {@code @idgenerator{consistent}}.
*
* @param token The current token.
*/
private JsDocToken parseIdGeneratorTag(JsDocToken token) {
String idgenKind = "unique";
if (token == JsDocToken.LEFT_CURLY) {
if (match(JsDocToken.STRING)) {
String name = stream.getString();
if (!idGeneratorAnnotationKeywords.contains(name)
&& !jsdocBuilder.hasParameter(name)) {
addParserWarning("msg.jsdoc.idgen.unknown", name);
}
idgenKind = name;
token = next();
} else {
addParserWarning("msg.jsdoc.idgen.bad");
return token;
}
if (!match(JsDocToken.RIGHT_CURLY)) {
addParserWarning("msg.jsdoc.idgen.bad");
} else {
token = next();
}
}
switch (idgenKind) {
case "unique":
if (!jsdocBuilder.recordIdGenerator()) {
addParserWarning("msg.jsdoc.idgen.duplicate");
}
break;
case "consistent":
if (!jsdocBuilder.recordConsistentIdGenerator()) {
addParserWarning("msg.jsdoc.idgen.duplicate");
}
break;
case "stable":
if (!jsdocBuilder.recordStableIdGenerator()) {
addParserWarning("msg.jsdoc.idgen.duplicate");
}
break;
case "xid":
if (!jsdocBuilder.recordXidGenerator()) {
addParserWarning("msg.jsdoc.idgen.duplicate");
}
break;
case "mapped":
if (!jsdocBuilder.recordMappedIdGenerator()) {
addParserWarning("msg.jsdoc.idgen.duplicate");
}
break;
}
return token;
}
/**
* Looks for a type expression at the current token and if found,
* returns it. Note that this method consumes input.
*
* @param token The current token.
* @return The type expression found or null if none.
*/
Node parseAndRecordTypeNode(JsDocToken token) {
return parseAndRecordTypeNode(token, stream.getLineno(), stream.getCharno(),
token == JsDocToken.LEFT_CURLY, false);
}
/**
* Looks for a parameter type expression at the current token and if found, returns it. Note that
* this method consumes input.
*
* @param token The current token.
* @param lineno The line of the type expression.
* @param startCharno The starting character position of the type expression.
* @param matchingLC Whether the type expression starts with a "{".
* @param onlyParseSimpleNames If true, only simple type names are parsed (via a call to
* parseTypeNameAnnotation instead of parseTypeExpressionAnnotation).
* @return The type expression found or null if none.
*/
private Node parseAndRecordTypeNode(
JsDocToken token,
int lineno,
int startCharno,
boolean matchingLC,
boolean onlyParseSimpleNames) {
Node typeNode;
if (onlyParseSimpleNames) {
typeNode = parseTypeNameAnnotation(token);
} else {
typeNode = parseTypeExpressionAnnotation(token);
}
recordTypeNode(lineno, startCharno, typeNode, matchingLC);
return typeNode;
}
/**
* Looks for a type expression at the current token and if found,
* returns it. Note that this method consumes input.
*
* @param token The current token.
* @param lineno The line of the type expression.
* @param startCharno The starting character position of the type expression.
* @param matchingLC Whether the type expression starts with a "{".
* @return The type expression found or null if none.
*/
private Node parseAndRecordTypeNameNode(JsDocToken token, int lineno,
int startCharno, boolean matchingLC) {
return parseAndRecordTypeNode(token, lineno, startCharno, matchingLC, true);
}
/**
* Looks for a type expression at the current token and if found,
* returns it. Note that this method consumes input.
*
* Parameter type expressions are special for two reasons:
*
* - They must begin with '{', to distinguish type names from param names.
*
- They may end in '=', to denote optionality.
*
*
* @param token The current token.
* @return The type expression found or null if none.
*/
private Node parseAndRecordParamTypeNode(JsDocToken token) {
checkArgument(token == JsDocToken.LEFT_CURLY);
int lineno = stream.getLineno();
int startCharno = stream.getCharno();
Node typeNode = parseParamTypeExpressionAnnotation(token);
recordTypeNode(lineno, startCharno, typeNode, true);
return typeNode;
}
/**
* Converts a JSDoc token to its string representation.
*/
private String toString(JsDocToken token) {
switch (token) {
case ANNOTATION:
return "@" + stream.getString();
case BANG:
return "!";
case COMMA:
return ",";
case COLON:
return ":";
case RIGHT_ANGLE:
return ">";
case LEFT_SQUARE:
return "[";
case LEFT_CURLY:
return "{";
case LEFT_PAREN:
return "(";
case LEFT_ANGLE:
return "<";
case QMARK:
return "?";
case PIPE:
return "|";
case RIGHT_SQUARE:
return "]";
case RIGHT_CURLY:
return "}";
case RIGHT_PAREN:
return ")";
case STAR:
return "*";
case ELLIPSIS:
return "...";
case EQUALS:
return "=";
case STRING:
return stream.getString();
default:
throw new IllegalStateException(token.toString());
}
}
/**
* Constructs a new {@code JSTypeExpression}.
* @param n A node. May be null.
*/
JSTypeExpression createJSTypeExpression(Node n) {
return n == null ? null :
new JSTypeExpression(n, getSourceName());
}
/**
* Tuple for returning both the string extracted and the
* new token following a call to any of the extract*Block
* methods.
*/
private static class ExtractionInfo {
private final String string;
private final JsDocToken token;
public ExtractionInfo(String string, JsDocToken token) {
this.string = string;
this.token = token;
}
}
/**
* Tuple for recording extended types
*/
private static class ExtendedTypeInfo {
final JSTypeExpression type;
final int lineno;
final int charno;
public ExtendedTypeInfo(JSTypeExpression type, int lineno, int charno) {
this.type = type;
this.lineno = lineno;
this.charno = charno;
}
}
/**
* Extracts the text found on the current line starting at token. Note that
* token = token.info; should be called after this method is used to update
* the token properly in the parser.
*
* @return The extraction information.
*/
private ExtractionInfo extractSingleLineBlock() {
// Get the current starting point.
stream.update();
int lineno = stream.getLineno();
int charno = stream.getCharno() + 1;
String line = getRemainingJSDocLine().trim();
// Record the textual description.
if (line.length() > 0) {
jsdocBuilder.markText(line, lineno, charno, lineno,
charno + line.length());
}
return new ExtractionInfo(line, next());
}
private ExtractionInfo extractMultilineTextualBlock(JsDocToken token) {
return extractMultilineTextualBlock(
token, getWhitespaceOption(WhitespaceOption.SINGLE_LINE), false);
}
/**
* Extracts the text found on the current line and all subsequent until either an annotation, end
* of comment or end of file is reached. Note that if this method detects an end of line as the
* first token, it will quit immediately (indicating that there is no text where it was expected).
* Note that token = info.token; should be called after this method is used to update the token
* properly in the parser.
*
* @param token The start token.
* @param option How to handle whitespace.
* @param includeAnnotations Whether the extracted text may include annotations. If set to false,
* text extraction will stop on the first encountered annotation token.
* @return The extraction information.
*/
private ExtractionInfo extractMultilineTextualBlock(
JsDocToken token, WhitespaceOption option, boolean includeAnnotations) {
if (token == JsDocToken.EOC || token == JsDocToken.EOL || token == JsDocToken.EOF) {
return new ExtractionInfo("", token);
}
return extractMultilineComment(token, option, true, includeAnnotations);
}
private WhitespaceOption getWhitespaceOption(WhitespaceOption defaultValue) {
return preserveWhitespace ? WhitespaceOption.PRESERVE : defaultValue;
}
private enum WhitespaceOption {
/**
* Preserves all whitespace and formatting. Needed for licenses and
* purposely formatted text.
*/
PRESERVE,
/** Preserves newlines but trims the output. */
TRIM,
/** Removes newlines and turns the output into a single line string. */
SINGLE_LINE
}
/**
* Extracts the top-level block comment from the JsDoc comment, if any.
* This method differs from the extractMultilineTextualBlock in that it
* terminates under different conditions (it doesn't have the same
* prechecks), it does not first read in the remaining of the current
* line and its conditions for ignoring the "*" (STAR) are different.
*
* @param token The starting token.
*
* @return The extraction information.
*/
private ExtractionInfo extractBlockComment(JsDocToken token) {
return extractMultilineComment(token, getWhitespaceOption(WhitespaceOption.TRIM), false, false);
}
/**
* Extracts text from the stream until the end of the comment, end of the
* file, or an annotation token is encountered. If the text is being
* extracted for a JSDoc marker, the first line in the stream will always be
* included in the extract text.
*
* @param token The starting token.
* @param option How to handle whitespace.
* @param isMarker Whether the extracted text is for a JSDoc marker or a
* block comment.
* @param includeAnnotations Whether the extracted text may include
* annotations. If set to false, text extraction will stop on the first
* encountered annotation token.
*
* @return The extraction information.
*/
private ExtractionInfo extractMultilineComment(
JsDocToken token, WhitespaceOption option, boolean isMarker, boolean includeAnnotations) {
StringBuilder builder = new StringBuilder();
int startLineno = -1;
int startCharno = -1;
if (isMarker) {
stream.update();
startLineno = stream.getLineno();
startCharno = stream.getCharno() + 1;
String line = getRemainingJSDocLine();
if (option != WhitespaceOption.PRESERVE) {
line = line.trim();
}
builder.append(line);
state = State.SEARCHING_ANNOTATION;
token = next();
}
boolean ignoreStar = false;
// Track the start of the line to count whitespace that
// the tokenizer skipped. Because this case is rare, it's easier
// to do this here than in the tokenizer.
int lineStartChar = -1;
do {
switch (token) {
case STAR:
if (ignoreStar) {
// Mark the position after the star as the new start of the line.
lineStartChar = stream.getCharno() + 1;
ignoreStar = false;
} else {
// The star is part of the comment.
padLine(builder, lineStartChar, option);
lineStartChar = -1;
builder.append('*');
}
token = next();
while (token == JsDocToken.STAR) {
if (lineStartChar != -1) {
padLine(builder, lineStartChar, option);
lineStartChar = -1;
}
builder.append('*');
token = next();
}
continue;
case EOL:
if (option != WhitespaceOption.SINGLE_LINE) {
builder.append('\n');
}
ignoreStar = true;
lineStartChar = 0;
token = next();
continue;
default:
ignoreStar = false;
state = State.SEARCHING_ANNOTATION;
boolean isEOC = token == JsDocToken.EOC;
if (!isEOC) {
padLine(builder, lineStartChar, option);
lineStartChar = -1;
}
if (token == JsDocToken.EOC ||
token == JsDocToken.EOF ||
// When we're capturing a license block, annotations
// in the block are OK.
(token == JsDocToken.ANNOTATION && !includeAnnotations)) {
String multilineText = builder.toString();
if (option != WhitespaceOption.PRESERVE) {
multilineText = multilineText.trim();
}
if (isMarker && !multilineText.isEmpty()) {
int endLineno = stream.getLineno();
int endCharno = stream.getCharno();
jsdocBuilder.markText(multilineText, startLineno, startCharno,
endLineno, endCharno);
}
return new ExtractionInfo(multilineText, token);
}
builder.append(toString(token));
String line = getRemainingJSDocLine();
if (option != WhitespaceOption.PRESERVE) {
line = trimEnd(line);
}
builder.append(line);
token = next();
}
} while (true);
}
private void padLine(StringBuilder builder, int lineStartChar, WhitespaceOption option) {
if (lineStartChar != -1 && option == WhitespaceOption.PRESERVE) {
int numSpaces = stream.getCharno() - lineStartChar;
for (int i = 0; i < numSpaces; i++) {
builder.append(' ');
}
} else if (builder.length() > 0) {
if (builder.charAt(builder.length() - 1) != '\n' || option == WhitespaceOption.PRESERVE) {
builder.append(' ');
}
}
}
/**
* Trim characters from only the end of a string.
* This method will remove all whitespace characters
* (defined by TokenUtil.isWhitespace(char), in addition to the characters
* provided, from the end of the provided string.
*
* @param s String to be trimmed
* @return String with whitespace and characters in extraChars removed
* from the end.
*/
private static String trimEnd(String s) {
int trimCount = 0;
while (trimCount < s.length()) {
char ch = s.charAt(s.length() - trimCount - 1);
if (TokenUtil.isWhitespace(ch)) {
trimCount++;
} else {
break;
}
}
if (trimCount == 0) {
return s;
}
return s.substring(0, s.length() - trimCount);
}
// Based on ES4 grammar proposed on July 10, 2008.
// http://wiki.ecmascript.org/doku.php?id=spec:spec
// Deliberately written to line up with the actual grammar rules,
// for maximum flexibility.
// TODO(nicksantos): The current implementation tries to maintain backwards
// compatibility with previous versions of the spec whenever we can.
// We should try to gradually withdraw support for these.
/**
* TypeExpressionAnnotation := TypeExpression |
* '{' TopLevelTypeExpression '}'
*/
private Node parseTypeExpressionAnnotation(JsDocToken token) {
if (token == JsDocToken.LEFT_CURLY) {
skipEOLs();
Node typeNode = parseTopLevelTypeExpression(next());
if (typeNode != null) {
skipEOLs();
if (!match(JsDocToken.RIGHT_CURLY)) {
reportTypeSyntaxWarning("msg.jsdoc.missing.rc");
} else {
next();
}
}
return typeNode;
} else {
// TODO(tbreisacher): Add a SuggestedFix for this warning.
reportTypeSyntaxWarning("msg.jsdoc.missing.braces");
return parseTypeExpression(token);
}
}
/**
* ParamTypeExpression :=
* OptionalParameterType |
* TopLevelTypeExpression |
* '...' TopLevelTypeExpression
*
* OptionalParameterType :=
* TopLevelTypeExpression '='
*
*/
private Node parseParamTypeExpression(JsDocToken token) {
boolean restArg = false;
if (token == JsDocToken.ELLIPSIS) {
token = next();
if (token == JsDocToken.RIGHT_CURLY) {
restoreLookAhead(token);
// EMPTY represents the UNKNOWN type in the Type AST.
return wrapNode(Token.ELLIPSIS, IR.empty());
}
restArg = true;
}
Node typeNode = parseTopLevelTypeExpression(token);
if (typeNode != null) {
skipEOLs();
if (restArg) {
typeNode = wrapNode(Token.ELLIPSIS, typeNode);
} else if (match(JsDocToken.EQUALS)) {
next();
skipEOLs();
typeNode = wrapNode(Token.EQUALS, typeNode);
}
}
return typeNode;
}
/**
* ParamTypeExpressionAnnotation := '{' ParamTypeExpression '}'
*/
private Node parseParamTypeExpressionAnnotation(JsDocToken token) {
checkArgument(token == JsDocToken.LEFT_CURLY);
skipEOLs();
Node typeNode = parseParamTypeExpression(next());
if (typeNode != null) {
if (!match(JsDocToken.RIGHT_CURLY)) {
reportTypeSyntaxWarning("msg.jsdoc.missing.rc");
} else {
next();
}
}
return typeNode;
}
/**
* TypeNameAnnotation := TypeName | '{' TypeName '}'
*/
private Node parseTypeNameAnnotation(JsDocToken token) {
if (token == JsDocToken.LEFT_CURLY) {
skipEOLs();
Node typeNode = parseTypeName(next());
if (typeNode != null) {
skipEOLs();
if (!match(JsDocToken.RIGHT_CURLY)) {
reportTypeSyntaxWarning("msg.jsdoc.missing.rc");
} else {
next();
}
}
return typeNode;
} else {
return parseTypeName(token);
}
}
/**
* TopLevelTypeExpression := TypeExpression
* | TypeUnionList
*
* We made this rule up, for the sake of backwards compatibility.
*/
private Node parseTopLevelTypeExpression(JsDocToken token) {
Node typeExpr = parseTypeExpression(token);
if (typeExpr != null) {
// top-level unions are allowed
if (match(JsDocToken.PIPE)) {
next();
skipEOLs();
token = next();
return parseUnionTypeWithAlternate(token, typeExpr);
}
}
return typeExpr;
}
/**
* TypeExpressionList := TopLevelTypeExpression
* | TopLevelTypeExpression ',' TypeExpressionList
*/
private Node parseTypeExpressionList(String typeName, JsDocToken token) {
Node typeExpr = parseTopLevelTypeExpression(token);
if (typeExpr == null) {
return null;
}
Node typeList = IR.block();
int numTypeExprs = 1;
typeList.addChildToBack(typeExpr);
while (match(JsDocToken.COMMA)) {
next();
skipEOLs();
typeExpr = parseTopLevelTypeExpression(next());
if (typeExpr == null) {
return null;
}
numTypeExprs++;
typeList.addChildToBack(typeExpr);
}
if (typeName.equals("Object") && numTypeExprs == 1) {
// Unlike other generic types, Object means Object, not Object.
typeList.addChildToFront(newNode(Token.QMARK));
}
return typeList;
}
/**
* TypeExpression := BasicTypeExpression
* | '?' BasicTypeExpression
* | '!' BasicTypeExpression
* | BasicTypeExpression '?'
* | BasicTypeExpression '!'
* | '?'
*/
private Node parseTypeExpression(JsDocToken token) {
if (token == JsDocToken.QMARK) {
// A QMARK could mean that a type is nullable, or that it's unknown.
// We use look-ahead 1 to determine whether it's unknown. Otherwise,
// we assume it means nullable. There are 8 cases:
// {?} - right curly
// ? - EOF (possible when the parseTypeString method is given a bare type expression)
// {?=} - equals
// {function(?, number)} - comma
// {function(number, ?)} - right paren
// {function(): ?|number} - pipe
// {Array.} - greater than
// /** ? */ - EOC (inline types)
// I'm not a big fan of using look-ahead for this, but it makes
// the type language a lot nicer.
token = next();
if (token == JsDocToken.COMMA
|| token == JsDocToken.EQUALS
|| token == JsDocToken.RIGHT_SQUARE
|| token == JsDocToken.RIGHT_CURLY
|| token == JsDocToken.RIGHT_PAREN
|| token == JsDocToken.PIPE
|| token == JsDocToken.RIGHT_ANGLE
|| token == JsDocToken.EOC
|| token == JsDocToken.EOL
|| token == JsDocToken.EOF) {
restoreLookAhead(token);
return newNode(Token.QMARK);
}
return wrapNode(Token.QMARK, parseBasicTypeExpression(token));
} else if (token == JsDocToken.BANG) {
return wrapNode(Token.BANG, parseBasicTypeExpression(next()));
} else {
Node basicTypeExpr = parseBasicTypeExpression(token);
if (basicTypeExpr != null) {
if (match(JsDocToken.QMARK)) {
next();
return wrapNode(Token.QMARK, basicTypeExpr);
} else if (match(JsDocToken.BANG)) {
next();
return wrapNode(Token.BANG, basicTypeExpr);
}
}
return basicTypeExpr;
}
}
/**
* ContextTypeExpression := BasicTypeExpression | '?'
* For expressions on the right hand side of a this: or new:
*/
private Node parseContextTypeExpression(JsDocToken token) {
if (token == JsDocToken.QMARK) {
return newNode(Token.QMARK);
} else {
return parseBasicTypeExpression(token);
}
}
/**
* BasicTypeExpression := '*' | 'null' | 'undefined' | TypeName
* | FunctionType | UnionType | RecordType
*/
private Node parseBasicTypeExpression(JsDocToken token) {
if (token == JsDocToken.STAR) {
return newNode(Token.STAR);
} else if (token == JsDocToken.LEFT_CURLY) {
skipEOLs();
return parseRecordType(next());
} else if (token == JsDocToken.LEFT_PAREN) {
skipEOLs();
return parseUnionType(next());
} else if (token == JsDocToken.STRING) {
String string = stream.getString();
switch (string) {
case "function":
skipEOLs();
return parseFunctionType(next());
case "null":
case "undefined":
return newStringNode(string);
default:
return parseTypeName(token);
}
}
restoreLookAhead(token);
return reportGenericTypeSyntaxWarning();
}
/**
* TypeName := NameExpression | NameExpression TypeApplication
* TypeApplication := '.<' TypeExpressionList '>'
*/
private Node parseTypeName(JsDocToken token) {
if (token != JsDocToken.STRING) {
return reportGenericTypeSyntaxWarning();
}
String typeName = stream.getString();
int lineno = stream.getLineno();
int charno = stream.getCharno();
while (match(JsDocToken.EOL) &&
typeName.charAt(typeName.length() - 1) == '.') {
skipEOLs();
if (match(JsDocToken.STRING)) {
next();
typeName += stream.getString();
}
}
Node typeNameNode = newStringNode(typeName, lineno, charno);
if (match(JsDocToken.LEFT_ANGLE)) {
next();
skipEOLs();
Node memberType = parseTypeExpressionList(typeName, next());
if (memberType != null) {
typeNameNode.addChildToFront(memberType);
skipEOLs();
if (!match(JsDocToken.RIGHT_ANGLE)) {
return reportTypeSyntaxWarning("msg.jsdoc.missing.gt");
}
next();
}
}
return typeNameNode;
}
/**
* FunctionType := 'function' FunctionSignatureType
* FunctionSignatureType :=
* TypeParameters '(' 'this' ':' TypeName, ParametersType ')' ResultType
*
* The Node that is produced has type Token.FUNCTION but does not look like a typical
* function node. If there is a 'this:' or 'new:' type, that type is added as a child.
* Then, if there are parameters, a PARAM_LIST node is added as a child. Finally, if
* there is a return type, it is added as a child. This means that the parameters
* could be the first or second child, and the return type could be
* the first, second, or third child.
*/
private Node parseFunctionType(JsDocToken token) {
// NOTE(nicksantos): We're not implementing generics at the moment, so
// just throw out TypeParameters.
if (token != JsDocToken.LEFT_PAREN) {
restoreLookAhead(token);
return reportTypeSyntaxWarning("msg.jsdoc.missing.lp");
}
Node functionType = newNode(Token.FUNCTION);
Node parameters = null;
skipEOLs();
if (!match(JsDocToken.RIGHT_PAREN)) {
token = next();
boolean hasParams = true;
if (token == JsDocToken.STRING) {
String tokenStr = stream.getString();
boolean isThis = "this".equals(tokenStr);
boolean isNew = "new".equals(tokenStr);
if (isThis || isNew) {
if (match(JsDocToken.COLON)) {
next();
skipEOLs();
Node contextType = wrapNode(
isThis ? Token.THIS : Token.NEW,
parseContextTypeExpression(next()));
if (contextType == null) {
return null;
}
functionType.addChildToFront(contextType);
} else {
return reportTypeSyntaxWarning("msg.jsdoc.missing.colon");
}
if (match(JsDocToken.COMMA)) {
next();
skipEOLs();
token = next();
} else {
hasParams = false;
}
}
}
if (hasParams) {
parameters = parseParametersType(token);
if (parameters == null) {
return null;
}
}
}
if (parameters != null) {
functionType.addChildToBack(parameters);
}
skipEOLs();
if (!match(JsDocToken.RIGHT_PAREN)) {
return reportTypeSyntaxWarning("msg.jsdoc.missing.rp");
}
skipEOLs();
next();
Node resultType = parseResultType();
if (resultType == null) {
return null;
} else {
functionType.addChildToBack(resultType);
}
return functionType;
}
/**
* ParametersType := RestParameterType | NonRestParametersType
* | NonRestParametersType ',' RestParameterType
* RestParameterType := '...' Identifier
* NonRestParametersType := ParameterType ',' NonRestParametersType
* | ParameterType
* | OptionalParametersType
* OptionalParametersType := OptionalParameterType
* | OptionalParameterType, OptionalParametersType
* OptionalParameterType := ParameterType=
* ParameterType := TypeExpression | Identifier ':' TypeExpression
*/
// NOTE(nicksantos): The official ES4 grammar forces optional and rest
// arguments to come after the required arguments. Our parser does not
// enforce this. Instead we allow them anywhere in the function at parse-time,
// and then warn about them during type resolution.
//
// In theory, it might be mathematically nicer to do the order-checking here.
// But in practice, the order-checking for structural functions is exactly
// the same as the order-checking for @param annotations. And the latter
// has to happen during type resolution. Rather than duplicate the
// order-checking in two places, we just do all of it in type resolution.
private Node parseParametersType(JsDocToken token) {
Node paramsType = newNode(Token.PARAM_LIST);
boolean isVarArgs = false;
Node paramType = null;
if (token != JsDocToken.RIGHT_PAREN) {
do {
if (paramType != null) {
// skip past the comma
next();
skipEOLs();
token = next();
}
if (token == JsDocToken.ELLIPSIS) {
// In the latest ES4 proposal, there are no type constraints allowed
// on variable arguments. We support the old syntax for backwards
// compatibility, but we should gradually tear it out.
skipEOLs();
if (match(JsDocToken.RIGHT_PAREN)) {
paramType = newNode(Token.ELLIPSIS);
} else {
skipEOLs();
paramType = wrapNode(Token.ELLIPSIS, parseTypeExpression(next()));
skipEOLs();
}
isVarArgs = true;
} else {
paramType = parseTypeExpression(token);
if (match(JsDocToken.EQUALS)) {
skipEOLs();
next();
paramType = wrapNode(Token.EQUALS, paramType);
}
}
if (paramType == null) {
return null;
}
paramsType.addChildToBack(paramType);
if (isVarArgs) {
break;
}
} while (match(JsDocToken.COMMA));
}
if (isVarArgs && match(JsDocToken.COMMA)) {
return reportTypeSyntaxWarning("msg.jsdoc.function.varargs");
}
// The right paren will be checked by parseFunctionType
return paramsType;
}
/**
* ResultType := | ':' void | ':' TypeExpression
*/
private Node parseResultType() {
skipEOLs();
if (!match(JsDocToken.COLON)) {
return newNode(Token.EMPTY);
}
next();
skipEOLs();
if (match(JsDocToken.STRING) && "void".equals(stream.getString())) {
next();
return newNode(Token.VOID);
} else {
return parseTypeExpression(next());
}
}
/**
* UnionType := '(' TypeUnionList ')'
* TypeUnionList := TypeExpression | TypeExpression '|' TypeUnionList
*
* We've removed the empty union type.
*/
private Node parseUnionType(JsDocToken token) {
return parseUnionTypeWithAlternate(token, null);
}
/**
* Create a new union type, with an alternate that has already been
* parsed. The alternate may be null.
*/
private Node parseUnionTypeWithAlternate(JsDocToken token, Node alternate) {
Node union = newNode(Token.PIPE);
if (alternate != null) {
union.addChildToBack(alternate);
}
Node expr = null;
do {
if (expr != null) {
skipEOLs();
token = next();
checkState(token == JsDocToken.PIPE);
skipEOLs();
token = next();
}
expr = parseTypeExpression(token);
if (expr == null) {
return null;
}
union.addChildToBack(expr);
} while (match(JsDocToken.PIPE));
if (alternate == null) {
skipEOLs();
if (!match(JsDocToken.RIGHT_PAREN)) {
return reportTypeSyntaxWarning("msg.jsdoc.missing.rp");
}
next();
}
if (union.hasOneChild()) {
Node firstChild = union.getFirstChild();
union.removeChild(firstChild);
return firstChild;
}
return union;
}
/**
* RecordType := '{' FieldTypeList '}'
*/
private Node parseRecordType(JsDocToken token) {
Node recordType = newNode(Token.LC);
Node fieldTypeList = parseFieldTypeList(token);
if (fieldTypeList == null) {
return reportGenericTypeSyntaxWarning();
}
skipEOLs();
if (!match(JsDocToken.RIGHT_CURLY)) {
return reportTypeSyntaxWarning("msg.jsdoc.missing.rc");
}
next();
recordType.addChildToBack(fieldTypeList);
return recordType;
}
/**
* FieldTypeList := FieldType | FieldType ',' FieldTypeList
*/
private Node parseFieldTypeList(JsDocToken token) {
Node fieldTypeList = newNode(Token.LB);
Set names = new HashSet<>();
do {
Node fieldType = parseFieldType(token);
if (fieldType == null) {
return null;
}
String name = fieldType.isStringKey() ? fieldType.getString()
: fieldType.getFirstChild().getString();
if (names.add(name)) {
fieldTypeList.addChildToBack(fieldType);
} else {
addTypeWarning("msg.jsdoc.type.record.duplicate", name);
}
skipEOLs();
if (!match(JsDocToken.COMMA)) {
break;
}
// Move to the comma token.
next();
// Move to the token past the comma
skipEOLs();
if (match(JsDocToken.RIGHT_CURLY)) {
// Allow trailing comma (ie, right curly following the comma)
break;
}
token = next();
} while (true);
return fieldTypeList;
}
/**
* FieldType := FieldName | FieldName ':' TypeExpression
*/
private Node parseFieldType(JsDocToken token) {
Node fieldName = parseFieldName(token);
if (fieldName == null) {
return null;
}
skipEOLs();
if (!match(JsDocToken.COLON)) {
return fieldName;
}
// Move to the colon.
next();
// Move to the token after the colon and parse
// the type expression.
skipEOLs();
Node typeExpression = parseTypeExpression(next());
if (typeExpression == null) {
return null;
}
Node fieldType = newNode(Token.COLON);
fieldType.addChildToBack(fieldName);
fieldType.addChildToBack(typeExpression);
return fieldType;
}
/**
* FieldName := NameExpression | StringLiteral | NumberLiteral |
* ReservedIdentifier
*/
private Node parseFieldName(JsDocToken token) {
switch (token) {
case STRING:
String s = stream.getString();
Node n = Node.newString(
Token.STRING_KEY, s, stream.getLineno(), stream.getCharno())
.clonePropsFrom(templateNode);
n.setLength(s.length());
return n;
default:
return null;
}
}
private Node wrapNode(Token type, Node n) {
return n == null ? null :
new Node(type, n, n.getLineno(),
n.getCharno()).clonePropsFrom(templateNode);
}
private Node newNode(Token type) {
return new Node(type, stream.getLineno(),
stream.getCharno()).clonePropsFrom(templateNode);
}
private Node newStringNode(String s) {
return newStringNode(s, stream.getLineno(), stream.getCharno());
}
private Node newStringNode(String s, int lineno, int charno) {
Node n = Node.newString(s, lineno, charno).clonePropsFrom(templateNode);
n.setLength(s.length());
return n;
}
private Node reportTypeSyntaxWarning(String warning) {
addTypeWarning(warning, stream.getLineno(), stream.getCharno());
return null;
}
private Node reportGenericTypeSyntaxWarning() {
return reportTypeSyntaxWarning("msg.jsdoc.type.syntax");
}
private JsDocToken eatUntilEOLIfNotAnnotation() {
return eatUntilEOLIfNotAnnotation(next());
}
private JsDocToken eatUntilEOLIfNotAnnotation(JsDocToken token) {
if (token == JsDocToken.ANNOTATION) {
state = State.SEARCHING_ANNOTATION;
return token;
}
return eatTokensUntilEOL(token);
}
/**
* Eats tokens until {@link JsDocToken#EOL} included, and switches back the
* state to {@link State#SEARCHING_ANNOTATION}.
*/
private JsDocToken eatTokensUntilEOL() {
return eatTokensUntilEOL(next());
}
/**
* Eats tokens until {@link JsDocToken#EOL} included, and switches back the
* state to {@link State#SEARCHING_ANNOTATION}.
*/
private JsDocToken eatTokensUntilEOL(JsDocToken token) {
do {
if (token == JsDocToken.EOL || token == JsDocToken.EOC ||
token == JsDocToken.EOF) {
state = State.SEARCHING_ANNOTATION;
return token;
}
token = next();
} while (true);
}
/**
* Specific value indicating that the {@link #unreadToken} contains no token.
*/
private static final JsDocToken NO_UNREAD_TOKEN = null;
/**
* One token buffer.
*/
private JsDocToken unreadToken = NO_UNREAD_TOKEN;
/** Restores the lookahead token to the token stream */
private void restoreLookAhead(JsDocToken token) {
unreadToken = token;
}
/**
* Tests whether the next symbol of the token stream matches the specific
* token.
*/
private boolean match(JsDocToken token) {
unreadToken = next();
return unreadToken == token;
}
/**
* Tests that the next symbol of the token stream matches one of the specified
* tokens.
*/
private boolean match(JsDocToken token1, JsDocToken token2) {
unreadToken = next();
return unreadToken == token1 || unreadToken == token2;
}
/**
* Gets the next token of the token stream or the buffered token if a matching
* was previously made.
*/
private JsDocToken next() {
if (unreadToken == NO_UNREAD_TOKEN) {
return stream.getJsDocToken();
} else {
return current();
}
}
/**
* Gets the current token, invalidating it in the process.
*/
private JsDocToken current() {
JsDocToken t = unreadToken;
unreadToken = NO_UNREAD_TOKEN;
return t;
}
/**
* Skips all EOLs and all empty lines in the JSDoc. Call this method if you
* want the JSDoc entry to span multiple lines.
*/
private void skipEOLs() {
while (match(JsDocToken.EOL)) {
next();
if (match(JsDocToken.STAR)) {
next();
}
}
}
/**
* Returns the remainder of the line.
*/
private String getRemainingJSDocLine() {
String result = stream.getRemainingJSDocLine();
unreadToken = NO_UNREAD_TOKEN;
return result;
}
/**
* Determines whether the parser has been populated with docinfo with a
* fileoverview tag.
*/
private boolean hasParsedFileOverviewDocInfo() {
return jsdocBuilder.isPopulatedWithFileOverview();
}
JSDocInfo retrieveAndResetParsedJSDocInfo() {
return jsdocBuilder.build();
}
/**
* Gets the fileoverview JSDocInfo, if any.
*/
JSDocInfo getFileOverviewJSDocInfo() {
return fileOverviewJSDocInfo;
}
/**
* Look ahead for a type annotation by advancing the character stream.
* Does not modify the token stream.
* This is kind of a hack, and is only necessary because we use the token
* stream to parse types, but need the underlying character stream to get
* JsDoc descriptions.
* @return Whether we found a type annotation.
*/
private boolean lookAheadForType() {
return lookAheadFor('{');
}
private boolean lookAheadForAnnotation() {
return lookAheadFor('@');
}
/**
* Look ahead by advancing the character stream.
* Does not modify the token stream.
* @return Whether we found the char.
*/
private boolean lookAheadFor(char expect) {
boolean matched = false;
int c;
while (true) {
c = stream.getChar();
if (c == ' ') {
continue;
} else if (c == expect) {
matched = true;
break;
} else {
break;
}
}
stream.ungetChar(c);
return matched;
}
}