js2go

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 Go to latest Published: May 12, 2021 License: Apache-2.0 Imports: 4 Imported by: 0

README

js2go

Original Goal

This project started to enable high-performance server-side rendering for Vue for backends written in Go by compiling JavaScript into Go. There were two main ideas behind it:

  • Compiling to Go should be better than other approaches (e.g., using node in a separate process just for serving server-rendered content, or embedding the V8 engine) because there would not be any inter-process communication (and no overhead to convert between V8 structures and host structures). We could also take advantage of the threading model of the Go runtime to render many requests in parallel.
  • Curiosity on how would an Ahead-of-Time compiler do in comparison with existing Just-In-Time compiler (V8).
  • Many JavaScript features are relatively easy to implement in Go because Go provides out of the box a wide range of powerful features. If not easy, it is at least an interesting exercise to do.

Current Status

After enough JavaScript features have been implemented to do a benchmark, the benchmark has shown that a compiled Go implementation is substantially slower than what V8 provides out of the box. Go compiler is not doing enough (any?) magic for a relatively straightforward implementation to achieve comparable performance.

The Just-In-Time compilation used by V8 seems to be more suitable than Ahead-of-Time for a dynamically typed language like JavaScript. The code produced by js2go has not (yet) been optimized, but the performance issue seems to be more fundamental: JavaScript (and current corresponding Go code made by js2go) lacks typing information for its values which means that every operation on values has first to check what the type is. In Go, values are implemented using an interface, which means one pointer lookup based on the concrete value type. Moreover, JavaScript arrays are sparse, so a naive implementation with Go map does not help much with cache locality and adds one more pointer lookup. You can read more about some issues compiling JavaScript with Ahead-of-Time approach here.

This compiler does produce programs which have more consistent performance behavior and lower memory footprint than V8 (node.js) though. But it is unclear if that would persist once all features of JavaScript were implemented.

There are few directions this projects could go:

  • Do more work on optimizing produced code: do static analysis to detect types, use specialized code for those types, find ways to remove pointers when they are not needed. But probably we would eventually have to do analysis and optimization during runtime, which means we would gain some form of JIT. V8 already has all of that so it unclear what would be the benefit of this direction.
  • The input to this compiler could be TypeScript and compiler could then use typing information to produce optimized code. Adding typing information would then have additional performance benefit. Moreover, if optimized code would fail at runtime because real values would not match expected types, failing execution would be seen as a feature, not a bug.
  • The compiler could become a JavaScript to Go migration tool, which would not really produce fully JavaScript compliant or even executable Go code, but idiomatic Go code which might require some manual changes to get it to work and behave like original JavaScript code.

Currently this project is on hold and none of these directions are pursued. If you are interested in contributing or discussing, feel free to open an issue.

Installation

Clone with --recursive:

git clone --recursive https://gitlab.com/js2go/js2go.git

If you want to regenerate the JavaScript Go parser, you have to install Antlr:

apt-get install openjdk-14-jre
cd /usr/local/lib
wget https://www.antlr.org/download/antlr-4.9.2-complete.jar

Add to .profile:

export CLASSPATH=".:/usr/local/lib/antlr-4.9.2-complete.jar:$CLASSPATH"

Add to .bashrc:

alias antlr4='java -Xmx500M -cp "/usr/local/lib/antlr-4.9-complete.jar:$CLASSPATH" org.antlr.v4.Tool'
alias grun='java -Xmx500M -cp "/usr/local/lib/antlr-4.9-complete.jar:$CLASSPATH" org.antlr.v4.gui.TestRig'

Benchmark

Benchmark comparing run time of running spectralnorm.js (see description) program for various values of n for:

n go gccgo node js2go otto v8go
200 0.006±0.000 0.017±0.001 0.048±0.003 0.505±0.009 17.153±0.016 0.029±0.001
400 0.025±0.002 0.030±0.002 0.054±0.000 1.955±0.011 68.992±0.060 0.046±0.003
600 0.055±0.004 0.048±0.004 0.074±0.003 4.340±0.020 157.690±0.369 0.062±0.004
800 0.089±0.004 0.065±0.004 0.091±0.000 7.732±0.037 282.356±0.361 0.087±0.003
1000 0.128±0.003 0.086±0.005 0.120±0.000 11.890±0.035 439.680±1.220 0.113±0.003
1200 0.175±0.003 0.107±0.004 0.154±0.000 17.165±0.018 633.312±0.615 0.150±0.003
1400 0.243±0.003 0.138±0.005 0.194±0.000 23.501±0.043 869.256±0.351 0.191±0.004
1600 0.314±0.003 0.172±0.003 0.241±0.000 30.883±0.054 1143.040±1.380 0.238±0.003
1800 0.392±0.003 0.209±0.004 0.294±0.000 38.898±0.073 1489.740±1.170 0.293±0.003
2000 0.483±0.003 0.257±0.003 0.361±0.003 48.171±0.037 1855.270±4.590 0.350±0.003
2200 0.569±0.003 0.299±0.003 0.419±0.000 58.508±0.153 0.417±0.002
2400 0.683±0.003 0.361±0.003 0.496±0.004 69.746±0.113 0.497±0.005
2600 0.796±0.003 0.410±0.003 0.568±0.001 81.806±0.075 0.583±0.003
2800 0.924±0.003 0.468±0.004 0.658±0.003 95.581±0.130 0.664±0.003
3000 1.067±0.005 0.535±0.004 0.743±0.000 109.910±0.069 0.763±0.003
3200 1.215±0.003 0.598±0.004 0.845±0.003 125.626±0.111 0.872±0.004
3400 1.358±0.003 0.682±0.004 0.942±0.000 142.237±0.223 0.987±0.003
3600 1.523±0.003 0.764±0.003 1.054±0.002 159.263±0.213 1.125±0.007
3800 1.700±0.002 0.839±0.004 1.179±0.005 177.440±0.228 1.263±0.006
4000 1.887±0.003 0.946±0.017 1.287±0.000 196.930±0.198 1.403±0.009
4200 2.068±0.003 1.017±0.004 1.427±0.001 217.336±0.242 1.561±0.012
4400 2.267±0.002 1.115±0.004 1.561±0.000 239.315±0.449 1.770±0.013
4600 2.479±0.003 1.215±0.004 1.697±0.003 261.922±0.434 1.983±0.008
4800 2.698±0.006 1.329±0.006 1.858±0.003 285.018±0.413 2.141±0.014
5000 2.928±0.003 1.435±0.003 1.999±0.003 313.531±0.481 2.402±0.018

All measurements are in seconds. Repeated 10 times and averaged. Note that measurements include program startup time.

node.js is really fast and even Go version of the program is unable to keep with it for large n. Only when compiled with gccgo Go compiler, Go version is faster for all n than node.js. It is important to note that Go version of the program knows data types and can preallocate arrays and that node.js generally has a higher startup cost. It is amazing to see how node.js can detect and adapt to that on the fly.

Otto is dramatically slow. js2go is visibly slower at small n already.

v8go is comparable with the node.js version, but this benchmark has not really transmitted a lot of data between Go and V8 engine.

  • Godzilla is a ES2015 to Go source code transpiler and runtime, but it seems it does not work on anything than the most trivial JavaScript programs.
  • Otto is a JavaScript interpreter written in Go.
  • v8go allows running JavaScript from Go inside a V8 engine.
  • Gojis is another JavaScript interpreter.
  • Goja is another JavaScript interpreter.

Documentation

Index

Constants

This section is empty.

Variables

This section is empty.

Functions

func Compile 

func Compile(javaScriptCode string, packageName string) (string, error)

func Preamble 

func Preamble() string

Types

type CompileError 

type CompileError struct {
	Message       string
	VisitorErrors []VisitorError
	SyntaxErrors  []SyntaxError
}

func (*CompileError) Error 

func (e *CompileError) Error() string

type ErrorListener 

type ErrorListener struct {
	SyntaxErrors []SyntaxError
}

func (*ErrorListener) ReportAmbiguity 

func (l *ErrorListener) ReportAmbiguity(recognizer antlr.Parser, dfa *antlr.DFA, startIndex, stopIndex int, exact bool, ambigAlts *antlr.BitSet, configs antlr.ATNConfigSet)

func (*ErrorListener) ReportAttemptingFullContext 

func (l *ErrorListener) ReportAttemptingFullContext(recognizer antlr.Parser, dfa *antlr.DFA, startIndex, stopIndex int, conflictingAlts *antlr.BitSet, configs antlr.ATNConfigSet)

func (*ErrorListener) ReportContextSensitivity 

func (l *ErrorListener) ReportContextSensitivity(recognizer antlr.Parser, dfa *antlr.DFA, startIndex, stopIndex, prediction int, configs antlr.ATNConfigSet)

func (*ErrorListener) SyntaxError 

func (l *ErrorListener) SyntaxError(recognizer antlr.Recognizer, offendingSymbol interface{}, line, column int, msg string, e antlr.RecognitionException)

type SyntaxError 

type SyntaxError struct {
	OffendingSymbol interface{}
	Line            int
	Column          int
	Msg             string
	Exception       antlr.RecognitionException
}

type Visitor 

type Visitor struct {
	Errors             []VisitorError
	TopLevelStatements string
	// contains filtered or unexported fields
}

func (*Visitor) AcceptString 

func (v *Visitor) AcceptString(tree antlr.ParseTree) string

func (*Visitor) AcceptStringVisitorResult 

func (v *Visitor) AcceptStringVisitorResult(tree antlr.ParseTree) parser.StringVisitorResult

func (*Visitor) Visit 

func (v *Visitor) Visit(tree antlr.ParseTree) interface{}

func (*Visitor) VisitAdditiveExpression 

func (v *Visitor) VisitAdditiveExpression(ctx *parser.AdditiveExpressionContext) parser.VisitorResult

Visit a parse tree produced by JavaScriptParser#AdditiveExpression.

func (*Visitor) VisitAliasName 

func (v *Visitor) VisitAliasName(ctx *parser.AliasNameContext) parser.VisitorResult

Visit a parse tree produced by JavaScriptParser#aliasName.

func (*Visitor) VisitAnonymousFunctionDecl 

func (v *Visitor) VisitAnonymousFunctionDecl(ctx *parser.AnonymousFunctionDeclContext) parser.VisitorResult

Visit a parse tree produced by JavaScriptParser#AnonymousFunctionDecl.

func (*Visitor) VisitArgument 

func (v *Visitor) VisitArgument(ctx *parser.ArgumentContext) parser.VisitorResult

Visit a parse tree produced by JavaScriptParser#argument.

func (*Visitor) VisitArguments 

func (v *Visitor) VisitArguments(ctx *parser.ArgumentsContext) parser.VisitorResult

Visit a parse tree produced by JavaScriptParser#arguments.

func (*Visitor) VisitArgumentsExpression 

func (v *Visitor) VisitArgumentsExpression(ctx *parser.ArgumentsExpressionContext) parser.VisitorResult

Visit a parse tree produced by JavaScriptParser#ArgumentsExpression.

func (*Visitor) VisitArrayElement 

func (v *Visitor) VisitArrayElement(ctx *parser.ArrayElementContext) parser.VisitorResult

Visit a parse tree produced by JavaScriptParser#arrayElement.

func (*Visitor) VisitArrayLiteral 

func (v *Visitor) VisitArrayLiteral(ctx *parser.ArrayLiteralContext) parser.VisitorResult

Visit a parse tree produced by JavaScriptParser#arrayLiteral.

func (*Visitor) VisitArrayLiteralExpression 

func (v *Visitor) VisitArrayLiteralExpression(ctx *parser.ArrayLiteralExpressionContext) parser.VisitorResult

Visit a parse tree produced by JavaScriptParser#ArrayLiteralExpression.

func (*Visitor) VisitArrowFunction 

func (v *Visitor) VisitArrowFunction(ctx *parser.ArrowFunctionContext) parser.VisitorResult

Visit a parse tree produced by JavaScriptParser#ArrowFunction.

func (*Visitor) VisitArrowFunctionBody 

func (v *Visitor) VisitArrowFunctionBody(ctx *parser.ArrowFunctionBodyContext) parser.VisitorResult

Visit a parse tree produced by JavaScriptParser#arrowFunctionBody.

func (*Visitor) VisitArrowFunctionParameters 

func (v *Visitor) VisitArrowFunctionParameters(ctx *parser.ArrowFunctionParametersContext) parser.VisitorResult

Visit a parse tree produced by JavaScriptParser#arrowFunctionParameters.

func (*Visitor) VisitAssignable 

func (v *Visitor) VisitAssignable(ctx *parser.AssignableContext) parser.VisitorResult

Visit a parse tree produced by JavaScriptParser#assignable.

func (*Visitor) VisitAssignmentExpression 

func (v *Visitor) VisitAssignmentExpression(ctx *parser.AssignmentExpressionContext) parser.VisitorResult

Visit a parse tree produced by JavaScriptParser#AssignmentExpression.

func (*Visitor) VisitAssignmentOperator 

func (v *Visitor) VisitAssignmentOperator(ctx *parser.AssignmentOperatorContext) parser.VisitorResult

Visit a parse tree produced by JavaScriptParser#assignmentOperator.

func (*Visitor) VisitAssignmentOperatorExpression 

func (v *Visitor) VisitAssignmentOperatorExpression(ctx *parser.AssignmentOperatorExpressionContext) parser.VisitorResult

Visit a parse tree produced by JavaScriptParser#AssignmentOperatorExpression.

func (*Visitor) VisitAwaitExpression 

func (v *Visitor) VisitAwaitExpression(ctx *parser.AwaitExpressionContext) parser.VisitorResult

Visit a parse tree produced by JavaScriptParser#AwaitExpression.

func (*Visitor) VisitBigintLiteral 

func (v *Visitor) VisitBigintLiteral(ctx *parser.BigintLiteralContext) parser.VisitorResult

Visit a parse tree produced by JavaScriptParser#bigintLiteral.

func (*Visitor) VisitBitAndExpression 

func (v *Visitor) VisitBitAndExpression(ctx *parser.BitAndExpressionContext) parser.VisitorResult

Visit a parse tree produced by JavaScriptParser#BitAndExpression.

func (*Visitor) VisitBitNotExpression 

func (v *Visitor) VisitBitNotExpression(ctx *parser.BitNotExpressionContext) parser.VisitorResult

Visit a parse tree produced by JavaScriptParser#BitNotExpression.

func (*Visitor) VisitBitOrExpression 

func (v *Visitor) VisitBitOrExpression(ctx *parser.BitOrExpressionContext) parser.VisitorResult

Visit a parse tree produced by JavaScriptParser#BitOrExpression.

func (*Visitor) VisitBitShiftExpression 

func (v *Visitor) VisitBitShiftExpression(ctx *parser.BitShiftExpressionContext) parser.VisitorResult

Visit a parse tree produced by JavaScriptParser#BitShiftExpression.

func (*Visitor) VisitBitXOrExpression 

func (v *Visitor) VisitBitXOrExpression(ctx *parser.BitXOrExpressionContext) parser.VisitorResult

Visit a parse tree produced by JavaScriptParser#BitXOrExpression.

func (*Visitor) VisitBlock 

func (v *Visitor) VisitBlock(ctx *parser.BlockContext) parser.VisitorResult

Visit a parse tree produced by JavaScriptParser#block.

func (*Visitor) VisitBreakStatement 

func (v *Visitor) VisitBreakStatement(ctx *parser.BreakStatementContext) parser.VisitorResult

Visit a parse tree produced by JavaScriptParser#breakStatement.

func (*Visitor) VisitCaseBlock 

func (v *Visitor) VisitCaseBlock(ctx *parser.CaseBlockContext) parser.VisitorResult

Visit a parse tree produced by JavaScriptParser#caseBlock.

func (*Visitor) VisitCaseClause 

func (v *Visitor) VisitCaseClause(ctx *parser.CaseClauseContext) parser.VisitorResult

Visit a parse tree produced by JavaScriptParser#caseClause.

func (*Visitor) VisitCaseClauses 

func (v *Visitor) VisitCaseClauses(ctx *parser.CaseClausesContext) parser.VisitorResult

Visit a parse tree produced by JavaScriptParser#caseClauses.

func (*Visitor) VisitCatchProduction 

func (v *Visitor) VisitCatchProduction(ctx *parser.CatchProductionContext) parser.VisitorResult

Visit a parse tree produced by JavaScriptParser#catchProduction.

func (*Visitor) VisitChildren 

func (v *Visitor) VisitChildren(node antlr.RuleNode) interface{}

func (*Visitor) VisitClassDeclaration 

func (v *Visitor) VisitClassDeclaration(ctx *parser.ClassDeclarationContext) parser.VisitorResult

Visit a parse tree produced by JavaScriptParser#classDeclaration.

func (*Visitor) VisitClassElement 

func (v *Visitor) VisitClassElement(ctx *parser.ClassElementContext) parser.VisitorResult

Visit a parse tree produced by JavaScriptParser#classElement.

func (*Visitor) VisitClassExpression 

func (v *Visitor) VisitClassExpression(ctx *parser.ClassExpressionContext) parser.VisitorResult

Visit a parse tree produced by JavaScriptParser#ClassExpression.

func (*Visitor) VisitClassTail 

func (v *Visitor) VisitClassTail(ctx *parser.ClassTailContext) parser.VisitorResult

Visit a parse tree produced by JavaScriptParser#classTail.

func (*Visitor) VisitCoalesceExpression 

func (v *Visitor) VisitCoalesceExpression(ctx *parser.CoalesceExpressionContext) parser.VisitorResult

Visit a parse tree produced by JavaScriptParser#CoalesceExpression.

func (*Visitor) VisitComputedPropertyExpressionAssignment 

func (v *Visitor) VisitComputedPropertyExpressionAssignment(ctx *parser.ComputedPropertyExpressionAssignmentContext) parser.VisitorResult

Visit a parse tree produced by JavaScriptParser#ComputedPropertyExpressionAssignment.

func (*Visitor) VisitContinueStatement 

func (v *Visitor) VisitContinueStatement(ctx *parser.ContinueStatementContext) parser.VisitorResult

Visit a parse tree produced by JavaScriptParser#continueStatement.

func (*Visitor) VisitDebuggerStatement 

func (v *Visitor) VisitDebuggerStatement(ctx *parser.DebuggerStatementContext) parser.VisitorResult

Visit a parse tree produced by JavaScriptParser#debuggerStatement.

func (*Visitor) VisitDeclaration 

func (v *Visitor) VisitDeclaration(ctx *parser.DeclarationContext) parser.VisitorResult

Visit a parse tree produced by JavaScriptParser#declaration.

func (*Visitor) VisitDefaultClause 

func (v *Visitor) VisitDefaultClause(ctx *parser.DefaultClauseContext) parser.VisitorResult

Visit a parse tree produced by JavaScriptParser#defaultClause.

func (*Visitor) VisitDeleteExpression 

func (v *Visitor) VisitDeleteExpression(ctx *parser.DeleteExpressionContext) parser.VisitorResult

Visit a parse tree produced by JavaScriptParser#DeleteExpression.

func (*Visitor) VisitDoStatement 

func (v *Visitor) VisitDoStatement(ctx *parser.DoStatementContext) parser.VisitorResult

Visit a parse tree produced by JavaScriptParser#DoStatement.

func (*Visitor) VisitElementList 

func (v *Visitor) VisitElementList(ctx *parser.ElementListContext) parser.VisitorResult

Visit a parse tree produced by JavaScriptParser#elementList.

func (*Visitor) VisitEmptyStatement_ 

func (v *Visitor) VisitEmptyStatement_(ctx *parser.EmptyStatement_Context) parser.VisitorResult

Visit a parse tree produced by JavaScriptParser#emptyStatement_.

func (*Visitor) VisitEos 

func (v *Visitor) VisitEos(ctx *parser.EosContext) parser.VisitorResult

Visit a parse tree produced by JavaScriptParser#eos.

func (*Visitor) VisitEqualityExpression 

func (v *Visitor) VisitEqualityExpression(ctx *parser.EqualityExpressionContext) parser.VisitorResult

Visit a parse tree produced by JavaScriptParser#EqualityExpression.

func (*Visitor) VisitErrorNode 

func (v *Visitor) VisitErrorNode(node antlr.ErrorNode) interface{}

func (*Visitor) VisitExportDeclaration 

func (v *Visitor) VisitExportDeclaration(ctx *parser.ExportDeclarationContext) parser.VisitorResult

Visit a parse tree produced by JavaScriptParser#ExportDeclaration.

func (*Visitor) VisitExportDefaultDeclaration 

func (v *Visitor) VisitExportDefaultDeclaration(ctx *parser.ExportDefaultDeclarationContext) parser.VisitorResult

Visit a parse tree produced by JavaScriptParser#ExportDefaultDeclaration.

func (*Visitor) VisitExportFromBlock 

func (v *Visitor) VisitExportFromBlock(ctx *parser.ExportFromBlockContext) parser.VisitorResult

Visit a parse tree produced by JavaScriptParser#exportFromBlock.

func (*Visitor) VisitExpressionSequence 

func (v *Visitor) VisitExpressionSequence(ctx *parser.ExpressionSequenceContext) parser.VisitorResult

Visit a parse tree produced by JavaScriptParser#expressionSequence.

func (*Visitor) VisitExpressionStatement 

func (v *Visitor) VisitExpressionStatement(ctx *parser.ExpressionStatementContext) parser.VisitorResult

Visit a parse tree produced by JavaScriptParser#expressionStatement.

func (*Visitor) VisitFinallyProduction 

func (v *Visitor) VisitFinallyProduction(ctx *parser.FinallyProductionContext) parser.VisitorResult

Visit a parse tree produced by JavaScriptParser#finallyProduction.

func (*Visitor) VisitForInStatement 

func (v *Visitor) VisitForInStatement(ctx *parser.ForInStatementContext) parser.VisitorResult

Visit a parse tree produced by JavaScriptParser#ForInStatement.

func (*Visitor) VisitForOfStatement 

func (v *Visitor) VisitForOfStatement(ctx *parser.ForOfStatementContext) parser.VisitorResult

Visit a parse tree produced by JavaScriptParser#ForOfStatement.

func (*Visitor) VisitForStatement 

func (v *Visitor) VisitForStatement(ctx *parser.ForStatementContext) parser.VisitorResult

Visit a parse tree produced by JavaScriptParser#ForStatement.

func (*Visitor) VisitFormalParameterArg 

func (v *Visitor) VisitFormalParameterArg(ctx *parser.FormalParameterArgContext) parser.VisitorResult

Visit a parse tree produced by JavaScriptParser#formalParameterArg.

func (*Visitor) VisitFormalParameterList 

func (v *Visitor) VisitFormalParameterList(ctx *parser.FormalParameterListContext) parser.VisitorResult

Visit a parse tree produced by JavaScriptParser#formalParameterList.

func (*Visitor) VisitFunctionBody 

func (v *Visitor) VisitFunctionBody(ctx *parser.FunctionBodyContext) parser.VisitorResult

Visit a parse tree produced by JavaScriptParser#functionBody.

func (*Visitor) VisitFunctionDecl 

func (v *Visitor) VisitFunctionDecl(ctx *parser.FunctionDeclContext) parser.VisitorResult

Visit a parse tree produced by JavaScriptParser#FunctionDecl.

func (*Visitor) VisitFunctionDeclaration 

func (v *Visitor) VisitFunctionDeclaration(ctx *parser.FunctionDeclarationContext) parser.VisitorResult

Visit a parse tree produced by JavaScriptParser#functionDeclaration.

func (*Visitor) VisitFunctionExpression 

func (v *Visitor) VisitFunctionExpression(ctx *parser.FunctionExpressionContext) parser.VisitorResult

Visit a parse tree produced by JavaScriptParser#FunctionExpression.

func (*Visitor) VisitFunctionProperty 

func (v *Visitor) VisitFunctionProperty(ctx *parser.FunctionPropertyContext) parser.VisitorResult

Visit a parse tree produced by JavaScriptParser#FunctionProperty.

func (*Visitor) VisitGetter 

func (v *Visitor) VisitGetter(ctx *parser.GetterContext) parser.VisitorResult

Visit a parse tree produced by JavaScriptParser#getter.

func (*Visitor) VisitIdentifier 

func (v *Visitor) VisitIdentifier(ctx *parser.IdentifierContext) parser.VisitorResult

Visit a parse tree produced by JavaScriptParser#identifier.

func (*Visitor) VisitIdentifierExpression 

func (v *Visitor) VisitIdentifierExpression(ctx *parser.IdentifierExpressionContext) parser.VisitorResult

Visit a parse tree produced by JavaScriptParser#IdentifierExpression.

func (*Visitor) VisitIdentifierName 

func (v *Visitor) VisitIdentifierName(ctx *parser.IdentifierNameContext) parser.VisitorResult

Visit a parse tree produced by JavaScriptParser#identifierName.

func (*Visitor) VisitIfStatement 

func (v *Visitor) VisitIfStatement(ctx *parser.IfStatementContext) parser.VisitorResult

Visit a parse tree produced by JavaScriptParser#ifStatement.

func (*Visitor) VisitImportDefault 

func (v *Visitor) VisitImportDefault(ctx *parser.ImportDefaultContext) parser.VisitorResult

Visit a parse tree produced by JavaScriptParser#importDefault.

func (*Visitor) VisitImportExpression 

func (v *Visitor) VisitImportExpression(ctx *parser.ImportExpressionContext) parser.VisitorResult

Visit a parse tree produced by JavaScriptParser#ImportExpression.

func (*Visitor) VisitImportFrom 

func (v *Visitor) VisitImportFrom(ctx *parser.ImportFromContext) parser.VisitorResult

Visit a parse tree produced by JavaScriptParser#importFrom.

func (*Visitor) VisitImportFromBlock 

func (v *Visitor) VisitImportFromBlock(ctx *parser.ImportFromBlockContext) parser.VisitorResult

Visit a parse tree produced by JavaScriptParser#importFromBlock.

func (*Visitor) VisitImportNamespace 

func (v *Visitor) VisitImportNamespace(ctx *parser.ImportNamespaceContext) parser.VisitorResult

Visit a parse tree produced by JavaScriptParser#importNamespace.

func (*Visitor) VisitImportStatement 

func (v *Visitor) VisitImportStatement(ctx *parser.ImportStatementContext) parser.VisitorResult

Visit a parse tree produced by JavaScriptParser#importStatement.

func (*Visitor) VisitInExpression 

func (v *Visitor) VisitInExpression(ctx *parser.InExpressionContext) parser.VisitorResult

Visit a parse tree produced by JavaScriptParser#InExpression.

func (*Visitor) VisitInstanceofExpression 

func (v *Visitor) VisitInstanceofExpression(ctx *parser.InstanceofExpressionContext) parser.VisitorResult

Visit a parse tree produced by JavaScriptParser#InstanceofExpression.

func (*Visitor) VisitKeyword 

func (v *Visitor) VisitKeyword(ctx *parser.KeywordContext) parser.VisitorResult

Visit a parse tree produced by JavaScriptParser#keyword.

func (*Visitor) VisitLabelledStatement 

func (v *Visitor) VisitLabelledStatement(ctx *parser.LabelledStatementContext) parser.VisitorResult

Visit a parse tree produced by JavaScriptParser#labelledStatement.

func (*Visitor) VisitLastFormalParameterArg 

func (v *Visitor) VisitLastFormalParameterArg(ctx *parser.LastFormalParameterArgContext) parser.VisitorResult

Visit a parse tree produced by JavaScriptParser#lastFormalParameterArg.

func (*Visitor) VisitLet_ 

func (v *Visitor) VisitLet_(ctx *parser.Let_Context) parser.VisitorResult

Visit a parse tree produced by JavaScriptParser#let_.

func (*Visitor) VisitLiteral 

func (v *Visitor) VisitLiteral(ctx *parser.LiteralContext) parser.VisitorResult

Visit a parse tree produced by JavaScriptParser#literal.

func (*Visitor) VisitLiteralExpression 

func (v *Visitor) VisitLiteralExpression(ctx *parser.LiteralExpressionContext) parser.VisitorResult

Visit a parse tree produced by JavaScriptParser#LiteralExpression.

func (*Visitor) VisitLogicalAndExpression 

func (v *Visitor) VisitLogicalAndExpression(ctx *parser.LogicalAndExpressionContext) parser.VisitorResult

Visit a parse tree produced by JavaScriptParser#LogicalAndExpression.

func (*Visitor) VisitLogicalOrExpression 

func (v *Visitor) VisitLogicalOrExpression(ctx *parser.LogicalOrExpressionContext) parser.VisitorResult

Visit a parse tree produced by JavaScriptParser#LogicalOrExpression.

func (*Visitor) VisitMemberDotExpression 

func (v *Visitor) VisitMemberDotExpression(ctx *parser.MemberDotExpressionContext) parser.VisitorResult

Visit a parse tree produced by JavaScriptParser#MemberDotExpression.

func (*Visitor) VisitMemberIndexExpression 

func (v *Visitor) VisitMemberIndexExpression(ctx *parser.MemberIndexExpressionContext) parser.VisitorResult

Visit a parse tree produced by JavaScriptParser#MemberIndexExpression.

func (*Visitor) VisitMetaExpression 

func (v *Visitor) VisitMetaExpression(ctx *parser.MetaExpressionContext) parser.VisitorResult

Visit a parse tree produced by JavaScriptParser#MetaExpression.

func (*Visitor) VisitMethodDefinition 

func (v *Visitor) VisitMethodDefinition(ctx *parser.MethodDefinitionContext) parser.VisitorResult

Visit a parse tree produced by JavaScriptParser#methodDefinition.

func (*Visitor) VisitModuleItems 

func (v *Visitor) VisitModuleItems(ctx *parser.ModuleItemsContext) parser.VisitorResult

Visit a parse tree produced by JavaScriptParser#moduleItems.

func (*Visitor) VisitMultiplicativeExpression 

func (v *Visitor) VisitMultiplicativeExpression(ctx *parser.MultiplicativeExpressionContext) parser.VisitorResult

Visit a parse tree produced by JavaScriptParser#MultiplicativeExpression.

func (*Visitor) VisitNewExpression 

func (v *Visitor) VisitNewExpression(ctx *parser.NewExpressionContext) parser.VisitorResult

Visit a parse tree produced by JavaScriptParser#NewExpression.

func (*Visitor) VisitNotExpression 

func (v *Visitor) VisitNotExpression(ctx *parser.NotExpressionContext) parser.VisitorResult

Visit a parse tree produced by JavaScriptParser#NotExpression.

func (*Visitor) VisitNumericLiteral 

func (v *Visitor) VisitNumericLiteral(ctx *parser.NumericLiteralContext) parser.VisitorResult

Visit a parse tree produced by JavaScriptParser#numericLiteral.

func (*Visitor) VisitObjectLiteral 

func (v *Visitor) VisitObjectLiteral(ctx *parser.ObjectLiteralContext) parser.VisitorResult

Visit a parse tree produced by JavaScriptParser#objectLiteral.

func (*Visitor) VisitObjectLiteralExpression 

func (v *Visitor) VisitObjectLiteralExpression(ctx *parser.ObjectLiteralExpressionContext) parser.VisitorResult

Visit a parse tree produced by JavaScriptParser#ObjectLiteralExpression.

func (*Visitor) VisitParenthesizedExpression 

func (v *Visitor) VisitParenthesizedExpression(ctx *parser.ParenthesizedExpressionContext) parser.VisitorResult

Visit a parse tree produced by JavaScriptParser#ParenthesizedExpression.

func (*Visitor) VisitPostDecreaseExpression 

func (v *Visitor) VisitPostDecreaseExpression(ctx *parser.PostDecreaseExpressionContext) parser.VisitorResult

Visit a parse tree produced by JavaScriptParser#PostDecreaseExpression.

func (*Visitor) VisitPostIncrementExpression 

func (v *Visitor) VisitPostIncrementExpression(ctx *parser.PostIncrementExpressionContext) parser.VisitorResult

Visit a parse tree produced by JavaScriptParser#PostIncrementExpression.

func (*Visitor) VisitPowerExpression 

func (v *Visitor) VisitPowerExpression(ctx *parser.PowerExpressionContext) parser.VisitorResult

Visit a parse tree produced by JavaScriptParser#PowerExpression.

func (*Visitor) VisitPreDecreaseExpression 

func (v *Visitor) VisitPreDecreaseExpression(ctx *parser.PreDecreaseExpressionContext) parser.VisitorResult

Visit a parse tree produced by JavaScriptParser#PreDecreaseExpression.

func (*Visitor) VisitPreIncrementExpression 

func (v *Visitor) VisitPreIncrementExpression(ctx *parser.PreIncrementExpressionContext) parser.VisitorResult

Visit a parse tree produced by JavaScriptParser#PreIncrementExpression.

func (*Visitor) VisitProgram 

func (v *Visitor) VisitProgram(ctx *parser.ProgramContext) parser.VisitorResult

Visit a parse tree produced by JavaScriptParser#program.

func (*Visitor) VisitPropertyExpressionAssignment 

func (v *Visitor) VisitPropertyExpressionAssignment(ctx *parser.PropertyExpressionAssignmentContext) parser.VisitorResult

Visit a parse tree produced by JavaScriptParser#PropertyExpressionAssignment.

func (*Visitor) VisitPropertyGetter 

func (v *Visitor) VisitPropertyGetter(ctx *parser.PropertyGetterContext) parser.VisitorResult

Visit a parse tree produced by JavaScriptParser#PropertyGetter.

func (*Visitor) VisitPropertyName 

func (v *Visitor) VisitPropertyName(ctx *parser.PropertyNameContext) parser.VisitorResult

Visit a parse tree produced by JavaScriptParser#propertyName.

func (*Visitor) VisitPropertySetter 

func (v *Visitor) VisitPropertySetter(ctx *parser.PropertySetterContext) parser.VisitorResult

Visit a parse tree produced by JavaScriptParser#PropertySetter.

func (*Visitor) VisitPropertyShorthand 

func (v *Visitor) VisitPropertyShorthand(ctx *parser.PropertyShorthandContext) parser.VisitorResult

Visit a parse tree produced by JavaScriptParser#PropertyShorthand.

func (*Visitor) VisitRelationalExpression 

func (v *Visitor) VisitRelationalExpression(ctx *parser.RelationalExpressionContext) parser.VisitorResult

Visit a parse tree produced by JavaScriptParser#RelationalExpression.

func (*Visitor) VisitReservedWord 

func (v *Visitor) VisitReservedWord(ctx *parser.ReservedWordContext) parser.VisitorResult

Visit a parse tree produced by JavaScriptParser#reservedWord.

func (*Visitor) VisitReturnStatement 

func (v *Visitor) VisitReturnStatement(ctx *parser.ReturnStatementContext) parser.VisitorResult

Visit a parse tree produced by JavaScriptParser#returnStatement.

func (*Visitor) VisitSetter 

func (v *Visitor) VisitSetter(ctx *parser.SetterContext) parser.VisitorResult

Visit a parse tree produced by JavaScriptParser#setter.

func (*Visitor) VisitSourceElement 

func (v *Visitor) VisitSourceElement(ctx *parser.SourceElementContext) parser.VisitorResult

Visit a parse tree produced by JavaScriptParser#sourceElement.

func (*Visitor) VisitSourceElements 

func (v *Visitor) VisitSourceElements(ctx *parser.SourceElementsContext) parser.VisitorResult

Visit a parse tree produced by JavaScriptParser#sourceElements.

func (*Visitor) VisitStatement 

func (v *Visitor) VisitStatement(ctx *parser.StatementContext) parser.VisitorResult

Visit a parse tree produced by JavaScriptParser#statement.

func (*Visitor) VisitStatementList 

func (v *Visitor) VisitStatementList(ctx *parser.StatementListContext) parser.VisitorResult

Visit a parse tree produced by JavaScriptParser#statementList.

func (*Visitor) VisitSuperExpression 

func (v *Visitor) VisitSuperExpression(ctx *parser.SuperExpressionContext) parser.VisitorResult

Visit a parse tree produced by JavaScriptParser#SuperExpression.

func (*Visitor) VisitSwitchStatement 

func (v *Visitor) VisitSwitchStatement(ctx *parser.SwitchStatementContext) parser.VisitorResult

Visit a parse tree produced by JavaScriptParser#switchStatement.

func (*Visitor) VisitTemplateStringExpression 

func (v *Visitor) VisitTemplateStringExpression(ctx *parser.TemplateStringExpressionContext) parser.VisitorResult

Visit a parse tree produced by JavaScriptParser#TemplateStringExpression.

func (*Visitor) VisitTerminal 

func (v *Visitor) VisitTerminal(node antlr.TerminalNode) interface{}

func (*Visitor) VisitTernaryExpression 

func (v *Visitor) VisitTernaryExpression(ctx *parser.TernaryExpressionContext) parser.VisitorResult

Visit a parse tree produced by JavaScriptParser#TernaryExpression.

func (*Visitor) VisitThisExpression 

func (v *Visitor) VisitThisExpression(ctx *parser.ThisExpressionContext) parser.VisitorResult

Visit a parse tree produced by JavaScriptParser#ThisExpression.

func (*Visitor) VisitThrowStatement 

func (v *Visitor) VisitThrowStatement(ctx *parser.ThrowStatementContext) parser.VisitorResult

Visit a parse tree produced by JavaScriptParser#throwStatement.

func (*Visitor) VisitTryStatement 

func (v *Visitor) VisitTryStatement(ctx *parser.TryStatementContext) parser.VisitorResult

Visit a parse tree produced by JavaScriptParser#tryStatement.

func (*Visitor) VisitTypeofExpression 

func (v *Visitor) VisitTypeofExpression(ctx *parser.TypeofExpressionContext) parser.VisitorResult

Visit a parse tree produced by JavaScriptParser#TypeofExpression.

func (*Visitor) VisitUnaryMinusExpression 

func (v *Visitor) VisitUnaryMinusExpression(ctx *parser.UnaryMinusExpressionContext) parser.VisitorResult

Visit a parse tree produced by JavaScriptParser#UnaryMinusExpression.

func (*Visitor) VisitUnaryPlusExpression 

func (v *Visitor) VisitUnaryPlusExpression(ctx *parser.UnaryPlusExpressionContext) parser.VisitorResult

Visit a parse tree produced by JavaScriptParser#UnaryPlusExpression.

func (*Visitor) VisitVarModifier 

func (v *Visitor) VisitVarModifier(ctx *parser.VarModifierContext) parser.VisitorResult

Visit a parse tree produced by JavaScriptParser#varModifier.

func (*Visitor) VisitVariableDeclaration 

func (v *Visitor) VisitVariableDeclaration(ctx *parser.VariableDeclarationContext) parser.VisitorResult

Visit a parse tree produced by JavaScriptParser#variableDeclaration.

func (*Visitor) VisitVariableDeclarationList 

func (v *Visitor) VisitVariableDeclarationList(ctx *parser.VariableDeclarationListContext) parser.VisitorResult

Visit a parse tree produced by JavaScriptParser#variableDeclarationList.

func (*Visitor) VisitVariableStatement 

func (v *Visitor) VisitVariableStatement(ctx *parser.VariableStatementContext) parser.VisitorResult

Visit a parse tree produced by JavaScriptParser#variableStatement.

func (*Visitor) VisitVoidExpression 

func (v *Visitor) VisitVoidExpression(ctx *parser.VoidExpressionContext) parser.VisitorResult

Visit a parse tree produced by JavaScriptParser#VoidExpression.

func (*Visitor) VisitWhileStatement 

func (v *Visitor) VisitWhileStatement(ctx *parser.WhileStatementContext) parser.VisitorResult

Visit a parse tree produced by JavaScriptParser#WhileStatement.

func (*Visitor) VisitWithStatement 

func (v *Visitor) VisitWithStatement(ctx *parser.WithStatementContext) parser.VisitorResult

Visit a parse tree produced by JavaScriptParser#withStatement.

func (*Visitor) VisitYieldExpression 

func (v *Visitor) VisitYieldExpression(ctx *parser.YieldExpressionContext) parser.VisitorResult

Visit a parse tree produced by JavaScriptParser#YieldExpression.

func (*Visitor) VisitYieldStatement 

func (v *Visitor) VisitYieldStatement(ctx *parser.YieldStatementContext) parser.VisitorResult

Visit a parse tree produced by JavaScriptParser#yieldStatement.

type VisitorError 

type VisitorError struct {
	Line   int
	Column int
	Text   string
}

Source Files

View all Source files

Directories

Path Synopsis
go
goja
js2go
otto
v8go
js
console
math
process

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