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502 lines
16 KiB
JavaScript
502 lines
16 KiB
JavaScript
import {LooseParser} from "./state"
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import {isDummy} from "./parseutil"
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import {tokTypes as tt} from ".."
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const lp = LooseParser.prototype
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lp.checkLVal = function(expr) {
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if (!expr) return expr
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switch (expr.type) {
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case "Identifier":
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case "MemberExpression":
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return expr
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case "ParenthesizedExpression":
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expr.expression = this.checkLVal(expr.expression)
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return expr
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default:
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return this.dummyIdent()
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}
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}
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lp.parseExpression = function(noIn) {
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let start = this.storeCurrentPos()
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let expr = this.parseMaybeAssign(noIn)
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if (this.tok.type === tt.comma) {
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let node = this.startNodeAt(start)
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node.expressions = [expr]
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while (this.eat(tt.comma)) node.expressions.push(this.parseMaybeAssign(noIn))
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return this.finishNode(node, "SequenceExpression")
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}
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return expr
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}
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lp.parseParenExpression = function() {
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this.pushCx()
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this.expect(tt.parenL)
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let val = this.parseExpression()
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this.popCx()
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this.expect(tt.parenR)
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return val
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}
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lp.parseMaybeAssign = function(noIn) {
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let start = this.storeCurrentPos()
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let left = this.parseMaybeConditional(noIn)
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if (this.tok.type.isAssign) {
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let node = this.startNodeAt(start)
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node.operator = this.tok.value
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node.left = this.tok.type === tt.eq ? this.toAssignable(left) : this.checkLVal(left)
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this.next()
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node.right = this.parseMaybeAssign(noIn)
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return this.finishNode(node, "AssignmentExpression")
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}
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return left
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}
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lp.parseMaybeConditional = function(noIn) {
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let start = this.storeCurrentPos()
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let expr = this.parseExprOps(noIn)
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if (this.eat(tt.question)) {
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let node = this.startNodeAt(start)
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node.test = expr
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node.consequent = this.parseMaybeAssign()
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node.alternate = this.expect(tt.colon) ? this.parseMaybeAssign(noIn) : this.dummyIdent()
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return this.finishNode(node, "ConditionalExpression")
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}
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return expr
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}
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lp.parseExprOps = function(noIn) {
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let start = this.storeCurrentPos()
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let indent = this.curIndent, line = this.curLineStart
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return this.parseExprOp(this.parseMaybeUnary(noIn), start, -1, noIn, indent, line)
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}
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lp.parseExprOp = function(left, start, minPrec, noIn, indent, line) {
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if (this.curLineStart != line && this.curIndent < indent && this.tokenStartsLine()) return left
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let prec = this.tok.type.binop
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if (prec != null && (!noIn || this.tok.type !== tt._in)) {
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if (prec > minPrec) {
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let node = this.startNodeAt(start)
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node.left = left
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node.operator = this.tok.value
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this.next()
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if (this.curLineStart != line && this.curIndent < indent && this.tokenStartsLine()) {
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node.right = this.dummyIdent()
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} else {
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let rightStart = this.storeCurrentPos()
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node.right = this.parseExprOp(this.parseMaybeUnary(noIn), rightStart, prec, noIn, indent, line)
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}
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this.finishNode(node, /&&|\|\|/.test(node.operator) ? "LogicalExpression" : "BinaryExpression")
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return this.parseExprOp(node, start, minPrec, noIn, indent, line)
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}
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}
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return left
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}
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lp.parseMaybeUnary = function(noIn) {
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if (this.tok.type.prefix) {
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let node = this.startNode(), update = this.tok.type === tt.incDec
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node.operator = this.tok.value
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node.prefix = true
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this.next()
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node.argument = this.parseMaybeUnary(noIn)
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if (update) node.argument = this.checkLVal(node.argument)
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return this.finishNode(node, update ? "UpdateExpression" : "UnaryExpression")
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} else if (this.tok.type === tt.ellipsis) {
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let node = this.startNode()
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this.next()
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node.argument = this.parseMaybeUnary(noIn)
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return this.finishNode(node, "SpreadElement")
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}
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let start = this.storeCurrentPos()
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let expr = this.parseExprSubscripts()
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while (this.tok.type.postfix && !this.canInsertSemicolon()) {
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let node = this.startNodeAt(start)
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node.operator = this.tok.value
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node.prefix = false
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node.argument = this.checkLVal(expr)
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this.next()
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expr = this.finishNode(node, "UpdateExpression")
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}
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return expr
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}
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lp.parseExprSubscripts = function() {
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let start = this.storeCurrentPos()
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return this.parseSubscripts(this.parseExprAtom(), start, false, this.curIndent, this.curLineStart)
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}
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lp.parseSubscripts = function(base, start, noCalls, startIndent, line) {
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for (;;) {
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if (this.curLineStart != line && this.curIndent <= startIndent && this.tokenStartsLine()) {
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if (this.tok.type == tt.dot && this.curIndent == startIndent)
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--startIndent
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else
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return base
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}
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if (this.eat(tt.dot)) {
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let node = this.startNodeAt(start)
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node.object = base
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if (this.curLineStart != line && this.curIndent <= startIndent && this.tokenStartsLine())
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node.property = this.dummyIdent()
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else
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node.property = this.parsePropertyAccessor() || this.dummyIdent()
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node.computed = false
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base = this.finishNode(node, "MemberExpression")
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} else if (this.tok.type == tt.bracketL) {
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this.pushCx()
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this.next()
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let node = this.startNodeAt(start)
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node.object = base
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node.property = this.parseExpression()
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node.computed = true
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this.popCx()
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this.expect(tt.bracketR)
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base = this.finishNode(node, "MemberExpression")
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} else if (!noCalls && this.tok.type == tt.parenL) {
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let node = this.startNodeAt(start)
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node.callee = base
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node.arguments = this.parseExprList(tt.parenR)
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base = this.finishNode(node, "CallExpression")
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} else if (this.tok.type == tt.backQuote) {
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let node = this.startNodeAt(start)
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node.tag = base
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node.quasi = this.parseTemplate()
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base = this.finishNode(node, "TaggedTemplateExpression")
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} else {
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return base
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}
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}
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}
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lp.parseExprAtom = function() {
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let node
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switch (this.tok.type) {
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case tt._this:
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case tt._super:
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let type = this.tok.type === tt._this ? "ThisExpression" : "Super"
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node = this.startNode()
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this.next()
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return this.finishNode(node, type)
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case tt.name:
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let start = this.storeCurrentPos()
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let id = this.parseIdent()
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return this.eat(tt.arrow) ? this.parseArrowExpression(this.startNodeAt(start), [id]) : id
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case tt.regexp:
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node = this.startNode()
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let val = this.tok.value
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node.regex = {pattern: val.pattern, flags: val.flags}
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node.value = val.value
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node.raw = this.input.slice(this.tok.start, this.tok.end)
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this.next()
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return this.finishNode(node, "Literal")
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case tt.num: case tt.string:
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node = this.startNode()
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node.value = this.tok.value
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node.raw = this.input.slice(this.tok.start, this.tok.end)
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this.next()
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return this.finishNode(node, "Literal")
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case tt._null: case tt._true: case tt._false:
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node = this.startNode()
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node.value = this.tok.type === tt._null ? null : this.tok.type === tt._true
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node.raw = this.tok.type.keyword
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this.next()
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return this.finishNode(node, "Literal")
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case tt.parenL:
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let parenStart = this.storeCurrentPos()
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this.next()
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let inner = this.parseExpression()
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this.expect(tt.parenR)
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if (this.eat(tt.arrow)) {
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return this.parseArrowExpression(this.startNodeAt(parenStart), inner.expressions || (isDummy(inner) ? [] : [inner]))
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}
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if (this.options.preserveParens) {
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let par = this.startNodeAt(parenStart)
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par.expression = inner
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inner = this.finishNode(par, "ParenthesizedExpression")
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}
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return inner
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case tt.bracketL:
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node = this.startNode()
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node.elements = this.parseExprList(tt.bracketR, true)
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return this.finishNode(node, "ArrayExpression")
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case tt.braceL:
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return this.parseObj()
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case tt._class:
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return this.parseClass()
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case tt._function:
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node = this.startNode()
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this.next()
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return this.parseFunction(node, false)
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case tt._new:
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return this.parseNew()
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case tt._yield:
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node = this.startNode()
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this.next()
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if (this.semicolon() || this.canInsertSemicolon() || (this.tok.type != tt.star && !this.tok.type.startsExpr)) {
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node.delegate = false
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node.argument = null
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} else {
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node.delegate = this.eat(tt.star)
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node.argument = this.parseMaybeAssign()
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}
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return this.finishNode(node, "YieldExpression")
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case tt.backQuote:
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return this.parseTemplate()
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default:
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return this.dummyIdent()
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}
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}
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lp.parseNew = function() {
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let node = this.startNode(), startIndent = this.curIndent, line = this.curLineStart
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let meta = this.parseIdent(true)
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if (this.options.ecmaVersion >= 6 && this.eat(tt.dot)) {
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node.meta = meta
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node.property = this.parseIdent(true)
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return this.finishNode(node, "MetaProperty")
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}
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let start = this.storeCurrentPos()
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node.callee = this.parseSubscripts(this.parseExprAtom(), start, true, startIndent, line)
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if (this.tok.type == tt.parenL) {
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node.arguments = this.parseExprList(tt.parenR)
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} else {
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node.arguments = []
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}
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return this.finishNode(node, "NewExpression")
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}
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lp.parseTemplateElement = function() {
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let elem = this.startNode()
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elem.value = {
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raw: this.input.slice(this.tok.start, this.tok.end).replace(/\r\n?/g, '\n'),
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cooked: this.tok.value
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}
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this.next()
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elem.tail = this.tok.type === tt.backQuote
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return this.finishNode(elem, "TemplateElement")
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}
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lp.parseTemplate = function() {
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let node = this.startNode()
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this.next()
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node.expressions = []
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let curElt = this.parseTemplateElement()
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node.quasis = [curElt]
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while (!curElt.tail) {
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this.next()
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node.expressions.push(this.parseExpression())
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if (this.expect(tt.braceR)) {
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curElt = this.parseTemplateElement()
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} else {
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curElt = this.startNode()
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curElt.value = {cooked: '', raw: ''}
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curElt.tail = true
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}
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node.quasis.push(curElt)
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}
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this.expect(tt.backQuote)
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return this.finishNode(node, "TemplateLiteral")
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}
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lp.parseObj = function() {
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let node = this.startNode()
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node.properties = []
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this.pushCx()
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let indent = this.curIndent + 1, line = this.curLineStart
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this.eat(tt.braceL)
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if (this.curIndent + 1 < indent) { indent = this.curIndent; line = this.curLineStart }
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while (!this.closes(tt.braceR, indent, line)) {
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let prop = this.startNode(), isGenerator, start
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if (this.options.ecmaVersion >= 6) {
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start = this.storeCurrentPos()
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prop.method = false
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prop.shorthand = false
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isGenerator = this.eat(tt.star)
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}
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this.parsePropertyName(prop)
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if (isDummy(prop.key)) { if (isDummy(this.parseMaybeAssign())) this.next(); this.eat(tt.comma); continue }
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if (this.eat(tt.colon)) {
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prop.kind = "init"
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prop.value = this.parseMaybeAssign()
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} else if (this.options.ecmaVersion >= 6 && (this.tok.type === tt.parenL || this.tok.type === tt.braceL)) {
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prop.kind = "init"
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prop.method = true
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prop.value = this.parseMethod(isGenerator)
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} else if (this.options.ecmaVersion >= 5 && prop.key.type === "Identifier" &&
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!prop.computed && (prop.key.name === "get" || prop.key.name === "set") &&
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(this.tok.type != tt.comma && this.tok.type != tt.braceR)) {
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prop.kind = prop.key.name
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this.parsePropertyName(prop)
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prop.value = this.parseMethod(false)
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} else {
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prop.kind = "init"
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if (this.options.ecmaVersion >= 6) {
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if (this.eat(tt.eq)) {
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let assign = this.startNodeAt(start)
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assign.operator = "="
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assign.left = prop.key
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assign.right = this.parseMaybeAssign()
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prop.value = this.finishNode(assign, "AssignmentExpression")
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} else {
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prop.value = prop.key
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}
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} else {
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prop.value = this.dummyIdent()
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}
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prop.shorthand = true
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}
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node.properties.push(this.finishNode(prop, "Property"))
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this.eat(tt.comma)
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}
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this.popCx()
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if (!this.eat(tt.braceR)) {
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// If there is no closing brace, make the node span to the start
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// of the next token (this is useful for Tern)
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this.last.end = this.tok.start
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if (this.options.locations) this.last.loc.end = this.tok.loc.start
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}
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return this.finishNode(node, "ObjectExpression")
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}
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lp.parsePropertyName = function(prop) {
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if (this.options.ecmaVersion >= 6) {
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if (this.eat(tt.bracketL)) {
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prop.computed = true
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prop.key = this.parseExpression()
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this.expect(tt.bracketR)
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return
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} else {
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prop.computed = false
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}
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}
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let key = (this.tok.type === tt.num || this.tok.type === tt.string) ? this.parseExprAtom() : this.parseIdent()
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prop.key = key || this.dummyIdent()
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}
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lp.parsePropertyAccessor = function() {
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if (this.tok.type === tt.name || this.tok.type.keyword) return this.parseIdent()
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}
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lp.parseIdent = function() {
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let name = this.tok.type === tt.name ? this.tok.value : this.tok.type.keyword
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if (!name) return this.dummyIdent()
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let node = this.startNode()
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this.next()
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node.name = name
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return this.finishNode(node, "Identifier")
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}
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lp.initFunction = function(node) {
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node.id = null
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node.params = []
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if (this.options.ecmaVersion >= 6) {
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node.generator = false
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node.expression = false
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}
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}
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// Convert existing expression atom to assignable pattern
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// if possible.
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lp.toAssignable = function(node, binding) {
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if (!node || node.type == "Identifier" || (node.type == "MemberExpression" && !binding)) {
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// Okay
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} else if (node.type == "ParenthesizedExpression") {
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node.expression = this.toAssignable(node.expression, binding)
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} else if (this.options.ecmaVersion < 6) {
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return this.dummyIdent()
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} else if (node.type == "ObjectExpression") {
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node.type = "ObjectPattern"
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let props = node.properties
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for (let i = 0; i < props.length; i++)
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props[i].value = this.toAssignable(props[i].value, binding)
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} else if (node.type == "ArrayExpression") {
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node.type = "ArrayPattern"
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this.toAssignableList(node.elements, binding)
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} else if (node.type == "SpreadElement") {
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node.type = "RestElement"
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node.argument = this.toAssignable(node.argument, binding)
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} else if (node.type == "AssignmentExpression") {
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node.type = "AssignmentPattern"
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delete node.operator
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} else {
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return this.dummyIdent()
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}
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return node
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}
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lp.toAssignableList = function(exprList, binding) {
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for (let i = 0; i < exprList.length; i++)
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exprList[i] = this.toAssignable(exprList[i], binding)
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return exprList
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}
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lp.parseFunctionParams = function(params) {
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params = this.parseExprList(tt.parenR)
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return this.toAssignableList(params, true)
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}
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lp.parseMethod = function(isGenerator) {
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let node = this.startNode()
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this.initFunction(node)
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node.params = this.parseFunctionParams()
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node.generator = isGenerator || false
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node.expression = this.options.ecmaVersion >= 6 && this.tok.type !== tt.braceL
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node.body = node.expression ? this.parseMaybeAssign() : this.parseBlock()
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return this.finishNode(node, "FunctionExpression")
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}
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lp.parseArrowExpression = function(node, params) {
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this.initFunction(node)
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node.params = this.toAssignableList(params, true)
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node.expression = this.tok.type !== tt.braceL
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node.body = node.expression ? this.parseMaybeAssign() : this.parseBlock()
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return this.finishNode(node, "ArrowFunctionExpression")
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}
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lp.parseExprList = function(close, allowEmpty) {
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this.pushCx()
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let indent = this.curIndent, line = this.curLineStart, elts = []
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this.next(); // Opening bracket
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while (!this.closes(close, indent + 1, line)) {
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if (this.eat(tt.comma)) {
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elts.push(allowEmpty ? null : this.dummyIdent())
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continue
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}
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let elt = this.parseMaybeAssign()
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if (isDummy(elt)) {
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if (this.closes(close, indent, line)) break
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this.next()
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} else {
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elts.push(elt)
|
|
}
|
|
this.eat(tt.comma)
|
|
}
|
|
this.popCx()
|
|
if (!this.eat(close)) {
|
|
// If there is no closing brace, make the node span to the start
|
|
// of the next token (this is useful for Tern)
|
|
this.last.end = this.tok.start
|
|
if (this.options.locations) this.last.loc.end = this.tok.loc.start
|
|
}
|
|
return elts
|
|
}
|