Official Go implementation of the Ethereum protocol
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go-ethereum/vendor/github.com/robertkrimen/otto/parser/statement.go

938 lines
23 KiB

package parser
import (
"github.com/robertkrimen/otto/ast"
"github.com/robertkrimen/otto/token"
)
func (self *_parser) parseBlockStatement() *ast.BlockStatement {
node := &ast.BlockStatement{}
// Find comments before the leading brace
if self.mode&StoreComments != 0 {
self.comments.CommentMap.AddComments(node, self.comments.FetchAll(), ast.LEADING)
self.comments.Unset()
}
node.LeftBrace = self.expect(token.LEFT_BRACE)
node.List = self.parseStatementList()
if self.mode&StoreComments != 0 {
self.comments.Unset()
self.comments.CommentMap.AddComments(node, self.comments.FetchAll(), ast.FINAL)
self.comments.AfterBlock()
}
node.RightBrace = self.expect(token.RIGHT_BRACE)
// Find comments after the trailing brace
if self.mode&StoreComments != 0 {
self.comments.ResetLineBreak()
self.comments.CommentMap.AddComments(node, self.comments.Fetch(), ast.TRAILING)
}
return node
}
func (self *_parser) parseEmptyStatement() ast.Statement {
idx := self.expect(token.SEMICOLON)
return &ast.EmptyStatement{Semicolon: idx}
}
func (self *_parser) parseStatementList() (list []ast.Statement) {
for self.token != token.RIGHT_BRACE && self.token != token.EOF {
statement := self.parseStatement()
list = append(list, statement)
}
return
}
func (self *_parser) parseStatement() ast.Statement {
if self.token == token.EOF {
self.errorUnexpectedToken(self.token)
return &ast.BadStatement{From: self.idx, To: self.idx + 1}
}
if self.mode&StoreComments != 0 {
self.comments.ResetLineBreak()
}
switch self.token {
case token.SEMICOLON:
return self.parseEmptyStatement()
case token.LEFT_BRACE:
return self.parseBlockStatement()
case token.IF:
return self.parseIfStatement()
case token.DO:
statement := self.parseDoWhileStatement()
self.comments.PostProcessNode(statement)
return statement
case token.WHILE:
return self.parseWhileStatement()
case token.FOR:
return self.parseForOrForInStatement()
case token.BREAK:
return self.parseBreakStatement()
case token.CONTINUE:
return self.parseContinueStatement()
case token.DEBUGGER:
return self.parseDebuggerStatement()
case token.WITH:
return self.parseWithStatement()
case token.VAR:
return self.parseVariableStatement()
case token.FUNCTION:
return self.parseFunctionStatement()
case token.SWITCH:
return self.parseSwitchStatement()
case token.RETURN:
return self.parseReturnStatement()
case token.THROW:
return self.parseThrowStatement()
case token.TRY:
return self.parseTryStatement()
}
var comments []*ast.Comment
if self.mode&StoreComments != 0 {
comments = self.comments.FetchAll()
}
expression := self.parseExpression()
if identifier, isIdentifier := expression.(*ast.Identifier); isIdentifier && self.token == token.COLON {
// LabelledStatement
colon := self.idx
if self.mode&StoreComments != 0 {
self.comments.Unset()
}
self.next() // :
label := identifier.Name
for _, value := range self.scope.labels {
if label == value {
self.error(identifier.Idx0(), "Label '%s' already exists", label)
}
}
var labelComments []*ast.Comment
if self.mode&StoreComments != 0 {
labelComments = self.comments.FetchAll()
}
self.scope.labels = append(self.scope.labels, label) // Push the label
statement := self.parseStatement()
self.scope.labels = self.scope.labels[:len(self.scope.labels)-1] // Pop the label
exp := &ast.LabelledStatement{
Label: identifier,
Colon: colon,
Statement: statement,
}
if self.mode&StoreComments != 0 {
self.comments.CommentMap.AddComments(exp, labelComments, ast.LEADING)
}
return exp
}
self.optionalSemicolon()
statement := &ast.ExpressionStatement{
Expression: expression,
}
if self.mode&StoreComments != 0 {
self.comments.CommentMap.AddComments(statement, comments, ast.LEADING)
}
return statement
}
func (self *_parser) parseTryStatement() ast.Statement {
var tryComments []*ast.Comment
if self.mode&StoreComments != 0 {
tryComments = self.comments.FetchAll()
}
node := &ast.TryStatement{
Try: self.expect(token.TRY),
Body: self.parseBlockStatement(),
}
if self.mode&StoreComments != 0 {
self.comments.CommentMap.AddComments(node, tryComments, ast.LEADING)
self.comments.CommentMap.AddComments(node.Body, self.comments.FetchAll(), ast.TRAILING)
}
if self.token == token.CATCH {
catch := self.idx
if self.mode&StoreComments != 0 {
self.comments.Unset()
}
self.next()
self.expect(token.LEFT_PARENTHESIS)
if self.token != token.IDENTIFIER {
self.expect(token.IDENTIFIER)
self.nextStatement()
return &ast.BadStatement{From: catch, To: self.idx}
} else {
identifier := self.parseIdentifier()
self.expect(token.RIGHT_PARENTHESIS)
node.Catch = &ast.CatchStatement{
Catch: catch,
Parameter: identifier,
Body: self.parseBlockStatement(),
}
if self.mode&StoreComments != 0 {
self.comments.CommentMap.AddComments(node.Catch.Body, self.comments.FetchAll(), ast.TRAILING)
}
}
}
if self.token == token.FINALLY {
if self.mode&StoreComments != 0 {
self.comments.Unset()
}
self.next()
if self.mode&StoreComments != 0 {
tryComments = self.comments.FetchAll()
}
node.Finally = self.parseBlockStatement()
if self.mode&StoreComments != 0 {
self.comments.CommentMap.AddComments(node.Finally, tryComments, ast.LEADING)
}
}
if node.Catch == nil && node.Finally == nil {
self.error(node.Try, "Missing catch or finally after try")
return &ast.BadStatement{From: node.Try, To: node.Body.Idx1()}
}
return node
}
func (self *_parser) parseFunctionParameterList() *ast.ParameterList {
opening := self.expect(token.LEFT_PARENTHESIS)
if self.mode&StoreComments != 0 {
self.comments.Unset()
}
var list []*ast.Identifier
for self.token != token.RIGHT_PARENTHESIS && self.token != token.EOF {
if self.token != token.IDENTIFIER {
self.expect(token.IDENTIFIER)
} else {
identifier := self.parseIdentifier()
list = append(list, identifier)
}
if self.token != token.RIGHT_PARENTHESIS {
if self.mode&StoreComments != 0 {
self.comments.Unset()
}
self.expect(token.COMMA)
}
}
closing := self.expect(token.RIGHT_PARENTHESIS)
return &ast.ParameterList{
Opening: opening,
List: list,
Closing: closing,
}
}
func (self *_parser) parseParameterList() (list []string) {
for self.token != token.EOF {
if self.token != token.IDENTIFIER {
self.expect(token.IDENTIFIER)
}
list = append(list, self.literal)
self.next()
if self.token != token.EOF {
self.expect(token.COMMA)
}
}
return
}
func (self *_parser) parseFunctionStatement() *ast.FunctionStatement {
var comments []*ast.Comment
if self.mode&StoreComments != 0 {
comments = self.comments.FetchAll()
}
function := &ast.FunctionStatement{
Function: self.parseFunction(true),
}
if self.mode&StoreComments != 0 {
self.comments.CommentMap.AddComments(function, comments, ast.LEADING)
}
return function
}
func (self *_parser) parseFunction(declaration bool) *ast.FunctionLiteral {
node := &ast.FunctionLiteral{
Function: self.expect(token.FUNCTION),
}
var name *ast.Identifier
if self.token == token.IDENTIFIER {
name = self.parseIdentifier()
if declaration {
self.scope.declare(&ast.FunctionDeclaration{
Function: node,
})
}
} else if declaration {
// Use expect error handling
self.expect(token.IDENTIFIER)
}
if self.mode&StoreComments != 0 {
self.comments.Unset()
}
node.Name = name
node.ParameterList = self.parseFunctionParameterList()
self.parseFunctionBlock(node)
node.Source = self.slice(node.Idx0(), node.Idx1())
return node
}
func (self *_parser) parseFunctionBlock(node *ast.FunctionLiteral) {
{
self.openScope()
inFunction := self.scope.inFunction
self.scope.inFunction = true
defer func() {
self.scope.inFunction = inFunction
self.closeScope()
}()
node.Body = self.parseBlockStatement()
node.DeclarationList = self.scope.declarationList
}
}
func (self *_parser) parseDebuggerStatement() ast.Statement {
idx := self.expect(token.DEBUGGER)
node := &ast.DebuggerStatement{
Debugger: idx,
}
if self.mode&StoreComments != 0 {
self.comments.CommentMap.AddComments(node, self.comments.FetchAll(), ast.TRAILING)
}
self.semicolon()
return node
}
func (self *_parser) parseReturnStatement() ast.Statement {
idx := self.expect(token.RETURN)
var comments []*ast.Comment
if self.mode&StoreComments != 0 {
comments = self.comments.FetchAll()
}
if !self.scope.inFunction {
self.error(idx, "Illegal return statement")
self.nextStatement()
return &ast.BadStatement{From: idx, To: self.idx}
}
node := &ast.ReturnStatement{
Return: idx,
}
if !self.implicitSemicolon && self.token != token.SEMICOLON && self.token != token.RIGHT_BRACE && self.token != token.EOF {
node.Argument = self.parseExpression()
}
if self.mode&StoreComments != 0 {
self.comments.CommentMap.AddComments(node, comments, ast.LEADING)
}
self.semicolon()
return node
}
func (self *_parser) parseThrowStatement() ast.Statement {
var comments []*ast.Comment
if self.mode&StoreComments != 0 {
comments = self.comments.FetchAll()
}
idx := self.expect(token.THROW)
if self.implicitSemicolon {
if self.chr == -1 { // Hackish
self.error(idx, "Unexpected end of input")
} else {
self.error(idx, "Illegal newline after throw")
}
self.nextStatement()
return &ast.BadStatement{From: idx, To: self.idx}
}
node := &ast.ThrowStatement{
Argument: self.parseExpression(),
}
if self.mode&StoreComments != 0 {
self.comments.CommentMap.AddComments(node, comments, ast.LEADING)
}
self.semicolon()
return node
}
func (self *_parser) parseSwitchStatement() ast.Statement {
var comments []*ast.Comment
if self.mode&StoreComments != 0 {
comments = self.comments.FetchAll()
}
self.expect(token.SWITCH)
if self.mode&StoreComments != 0 {
comments = append(comments, self.comments.FetchAll()...)
}
self.expect(token.LEFT_PARENTHESIS)
node := &ast.SwitchStatement{
Discriminant: self.parseExpression(),
Default: -1,
}
self.expect(token.RIGHT_PARENTHESIS)
if self.mode&StoreComments != 0 {
comments = append(comments, self.comments.FetchAll()...)
}
self.expect(token.LEFT_BRACE)
inSwitch := self.scope.inSwitch
self.scope.inSwitch = true
defer func() {
self.scope.inSwitch = inSwitch
}()
for index := 0; self.token != token.EOF; index++ {
if self.token == token.RIGHT_BRACE {
self.next()
break
}
clause := self.parseCaseStatement()
if clause.Test == nil {
if node.Default != -1 {
self.error(clause.Case, "Already saw a default in switch")
}
node.Default = index
}
node.Body = append(node.Body, clause)
}
if self.mode&StoreComments != 0 {
self.comments.CommentMap.AddComments(node, comments, ast.LEADING)
}
return node
}
func (self *_parser) parseWithStatement() ast.Statement {
var comments []*ast.Comment
if self.mode&StoreComments != 0 {
comments = self.comments.FetchAll()
}
self.expect(token.WITH)
var withComments []*ast.Comment
if self.mode&StoreComments != 0 {
withComments = self.comments.FetchAll()
}
self.expect(token.LEFT_PARENTHESIS)
node := &ast.WithStatement{
Object: self.parseExpression(),
}
self.expect(token.RIGHT_PARENTHESIS)
if self.mode&StoreComments != 0 {
//comments = append(comments, self.comments.FetchAll()...)
self.comments.CommentMap.AddComments(node, comments, ast.LEADING)
self.comments.CommentMap.AddComments(node, withComments, ast.WITH)
}
node.Body = self.parseStatement()
return node
}
func (self *_parser) parseCaseStatement() *ast.CaseStatement {
node := &ast.CaseStatement{
Case: self.idx,
}
var comments []*ast.Comment
if self.mode&StoreComments != 0 {
comments = self.comments.FetchAll()
self.comments.Unset()
}
if self.token == token.DEFAULT {
self.next()
} else {
self.expect(token.CASE)
node.Test = self.parseExpression()
}
if self.mode&StoreComments != 0 {
self.comments.Unset()
}
self.expect(token.COLON)
for {
if self.token == token.EOF ||
self.token == token.RIGHT_BRACE ||
self.token == token.CASE ||
self.token == token.DEFAULT {
break
}
consequent := self.parseStatement()
node.Consequent = append(node.Consequent, consequent)
}
// Link the comments to the case statement
if self.mode&StoreComments != 0 {
self.comments.CommentMap.AddComments(node, comments, ast.LEADING)
}
return node
}
func (self *_parser) parseIterationStatement() ast.Statement {
inIteration := self.scope.inIteration
self.scope.inIteration = true
defer func() {
self.scope.inIteration = inIteration
}()
return self.parseStatement()
}
func (self *_parser) parseForIn(into ast.Expression) *ast.ForInStatement {
// Already have consumed "<into> in"
source := self.parseExpression()
self.expect(token.RIGHT_PARENTHESIS)
body := self.parseIterationStatement()
forin := &ast.ForInStatement{
Into: into,
Source: source,
Body: body,
}
return forin
}
func (self *_parser) parseFor(initializer ast.Expression) *ast.ForStatement {
// Already have consumed "<initializer> ;"
var test, update ast.Expression
if self.token != token.SEMICOLON {
test = self.parseExpression()
}
if self.mode&StoreComments != 0 {
self.comments.Unset()
}
self.expect(token.SEMICOLON)
if self.token != token.RIGHT_PARENTHESIS {
update = self.parseExpression()
}
self.expect(token.RIGHT_PARENTHESIS)
body := self.parseIterationStatement()
forstatement := &ast.ForStatement{
Initializer: initializer,
Test: test,
Update: update,
Body: body,
}
return forstatement
}
func (self *_parser) parseForOrForInStatement() ast.Statement {
var comments []*ast.Comment
if self.mode&StoreComments != 0 {
comments = self.comments.FetchAll()
}
idx := self.expect(token.FOR)
var forComments []*ast.Comment
if self.mode&StoreComments != 0 {
forComments = self.comments.FetchAll()
}
self.expect(token.LEFT_PARENTHESIS)
var left []ast.Expression
forIn := false
if self.token != token.SEMICOLON {
allowIn := self.scope.allowIn
self.scope.allowIn = false
if self.token == token.VAR {
var_ := self.idx
var varComments []*ast.Comment
if self.mode&StoreComments != 0 {
varComments = self.comments.FetchAll()
self.comments.Unset()
}
self.next()
list := self.parseVariableDeclarationList(var_)
if len(list) == 1 && self.token == token.IN {
if self.mode&StoreComments != 0 {
self.comments.Unset()
}
self.next() // in
forIn = true
left = []ast.Expression{list[0]} // There is only one declaration
} else {
left = list
}
if self.mode&StoreComments != 0 {
self.comments.CommentMap.AddComments(left[0], varComments, ast.LEADING)
}
} else {
left = append(left, self.parseExpression())
if self.token == token.IN {
self.next()
forIn = true
}
}
self.scope.allowIn = allowIn
}
if forIn {
switch left[0].(type) {
case *ast.Identifier, *ast.DotExpression, *ast.BracketExpression, *ast.VariableExpression:
// These are all acceptable
default:
self.error(idx, "Invalid left-hand side in for-in")
self.nextStatement()
return &ast.BadStatement{From: idx, To: self.idx}
}
forin := self.parseForIn(left[0])
if self.mode&StoreComments != 0 {
self.comments.CommentMap.AddComments(forin, comments, ast.LEADING)
self.comments.CommentMap.AddComments(forin, forComments, ast.FOR)
}
return forin
}
if self.mode&StoreComments != 0 {
self.comments.Unset()
}
self.expect(token.SEMICOLON)
initializer := &ast.SequenceExpression{Sequence: left}
forstatement := self.parseFor(initializer)
if self.mode&StoreComments != 0 {
self.comments.CommentMap.AddComments(forstatement, comments, ast.LEADING)
self.comments.CommentMap.AddComments(forstatement, forComments, ast.FOR)
}
return forstatement
}
func (self *_parser) parseVariableStatement() *ast.VariableStatement {
var comments []*ast.Comment
if self.mode&StoreComments != 0 {
comments = self.comments.FetchAll()
}
idx := self.expect(token.VAR)
list := self.parseVariableDeclarationList(idx)
statement := &ast.VariableStatement{
Var: idx,
List: list,
}
if self.mode&StoreComments != 0 {
self.comments.CommentMap.AddComments(statement, comments, ast.LEADING)
self.comments.Unset()
}
self.semicolon()
return statement
}
func (self *_parser) parseDoWhileStatement() ast.Statement {
inIteration := self.scope.inIteration
self.scope.inIteration = true
defer func() {
self.scope.inIteration = inIteration
}()
var comments []*ast.Comment
if self.mode&StoreComments != 0 {
comments = self.comments.FetchAll()
}
self.expect(token.DO)
var doComments []*ast.Comment
if self.mode&StoreComments != 0 {
doComments = self.comments.FetchAll()
}
node := &ast.DoWhileStatement{}
if self.token == token.LEFT_BRACE {
node.Body = self.parseBlockStatement()
} else {
node.Body = self.parseStatement()
}
self.expect(token.WHILE)
var whileComments []*ast.Comment
if self.mode&StoreComments != 0 {
whileComments = self.comments.FetchAll()
}
self.expect(token.LEFT_PARENTHESIS)
node.Test = self.parseExpression()
self.expect(token.RIGHT_PARENTHESIS)
if self.mode&StoreComments != 0 {
self.comments.CommentMap.AddComments(node, comments, ast.LEADING)
self.comments.CommentMap.AddComments(node, doComments, ast.DO)
self.comments.CommentMap.AddComments(node, whileComments, ast.WHILE)
}
return node
}
func (self *_parser) parseWhileStatement() ast.Statement {
var comments []*ast.Comment
if self.mode&StoreComments != 0 {
comments = self.comments.FetchAll()
}
self.expect(token.WHILE)
var whileComments []*ast.Comment
if self.mode&StoreComments != 0 {
whileComments = self.comments.FetchAll()
}
self.expect(token.LEFT_PARENTHESIS)
node := &ast.WhileStatement{
Test: self.parseExpression(),
}
self.expect(token.RIGHT_PARENTHESIS)
node.Body = self.parseIterationStatement()
if self.mode&StoreComments != 0 {
self.comments.CommentMap.AddComments(node, comments, ast.LEADING)
self.comments.CommentMap.AddComments(node, whileComments, ast.WHILE)
}
return node
}
func (self *_parser) parseIfStatement() ast.Statement {
var comments []*ast.Comment
if self.mode&StoreComments != 0 {
comments = self.comments.FetchAll()
}
self.expect(token.IF)
var ifComments []*ast.Comment
if self.mode&StoreComments != 0 {
ifComments = self.comments.FetchAll()
}
self.expect(token.LEFT_PARENTHESIS)
node := &ast.IfStatement{
Test: self.parseExpression(),
}
self.expect(token.RIGHT_PARENTHESIS)
if self.token == token.LEFT_BRACE {
node.Consequent = self.parseBlockStatement()
} else {
node.Consequent = self.parseStatement()
}
if self.token == token.ELSE {
self.next()
node.Alternate = self.parseStatement()
}
if self.mode&StoreComments != 0 {
self.comments.CommentMap.AddComments(node, comments, ast.LEADING)
self.comments.CommentMap.AddComments(node, ifComments, ast.IF)
}
return node
}
func (self *_parser) parseSourceElement() ast.Statement {
statement := self.parseStatement()
//self.comments.Unset()
return statement
}
func (self *_parser) parseSourceElements() []ast.Statement {
body := []ast.Statement(nil)
for {
if self.token != token.STRING {
break
}
body = append(body, self.parseSourceElement())
}
for self.token != token.EOF {
body = append(body, self.parseSourceElement())
}
return body
}
func (self *_parser) parseProgram() *ast.Program {
self.openScope()
defer self.closeScope()
return &ast.Program{
Body: self.parseSourceElements(),
DeclarationList: self.scope.declarationList,
File: self.file,
}
}
func (self *_parser) parseBreakStatement() ast.Statement {
var comments []*ast.Comment
if self.mode&StoreComments != 0 {
comments = self.comments.FetchAll()
}
idx := self.expect(token.BREAK)
semicolon := self.implicitSemicolon
if self.token == token.SEMICOLON {
semicolon = true
self.next()
}
if semicolon || self.token == token.RIGHT_BRACE {
self.implicitSemicolon = false
if !self.scope.inIteration && !self.scope.inSwitch {
goto illegal
}
breakStatement := &ast.BranchStatement{
Idx: idx,
Token: token.BREAK,
}
if self.mode&StoreComments != 0 {
self.comments.CommentMap.AddComments(breakStatement, comments, ast.LEADING)
self.comments.CommentMap.AddComments(breakStatement, self.comments.FetchAll(), ast.TRAILING)
}
return breakStatement
}
if self.token == token.IDENTIFIER {
identifier := self.parseIdentifier()
if !self.scope.hasLabel(identifier.Name) {
self.error(idx, "Undefined label '%s'", identifier.Name)
return &ast.BadStatement{From: idx, To: identifier.Idx1()}
}
self.semicolon()
breakStatement := &ast.BranchStatement{
Idx: idx,
Token: token.BREAK,
Label: identifier,
}
if self.mode&StoreComments != 0 {
self.comments.CommentMap.AddComments(breakStatement, comments, ast.LEADING)
}
return breakStatement
}
self.expect(token.IDENTIFIER)
illegal:
self.error(idx, "Illegal break statement")
self.nextStatement()
return &ast.BadStatement{From: idx, To: self.idx}
}
func (self *_parser) parseContinueStatement() ast.Statement {
idx := self.expect(token.CONTINUE)
semicolon := self.implicitSemicolon
if self.token == token.SEMICOLON {
semicolon = true
self.next()
}
if semicolon || self.token == token.RIGHT_BRACE {
self.implicitSemicolon = false
if !self.scope.inIteration {
goto illegal
}
return &ast.BranchStatement{
Idx: idx,
Token: token.CONTINUE,
}
}
if self.token == token.IDENTIFIER {
identifier := self.parseIdentifier()
if !self.scope.hasLabel(identifier.Name) {
self.error(idx, "Undefined label '%s'", identifier.Name)
return &ast.BadStatement{From: idx, To: identifier.Idx1()}
}
if !self.scope.inIteration {
goto illegal
}
self.semicolon()
return &ast.BranchStatement{
Idx: idx,
Token: token.CONTINUE,
Label: identifier,
}
}
self.expect(token.IDENTIFIER)
illegal:
self.error(idx, "Illegal continue statement")
self.nextStatement()
return &ast.BadStatement{From: idx, To: self.idx}
}
// Find the next statement after an error (recover)
func (self *_parser) nextStatement() {
for {
switch self.token {
case token.BREAK, token.CONTINUE,
token.FOR, token.IF, token.RETURN, token.SWITCH,
token.VAR, token.DO, token.TRY, token.WITH,
token.WHILE, token.THROW, token.CATCH, token.FINALLY:
// Return only if parser made some progress since last
// sync or if it has not reached 10 next calls without
// progress. Otherwise consume at least one token to
// avoid an endless parser loop
if self.idx == self.recover.idx && self.recover.count < 10 {
self.recover.count++
return
}
if self.idx > self.recover.idx {
self.recover.idx = self.idx
self.recover.count = 0
return
}
// Reaching here indicates a parser bug, likely an
// incorrect token list in this function, but it only
// leads to skipping of possibly correct code if a
// previous error is present, and thus is preferred
// over a non-terminating parse.
case token.EOF:
return
}
self.next()
}
}