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Mini Shell
Mini Shell
import {LooseParser} from "./state"
import {isDummy} from "./parseutil"
import {tokTypes as tt} from "acorn"
const lp = LooseParser.prototype
lp.checkLVal = function(expr) {
if (!expr) return expr
switch (expr.type) {
case "Identifier":
case "MemberExpression":
return expr
case "ParenthesizedExpression":
expr.expression = this.checkLVal(expr.expression)
return expr
default:
return this.dummyIdent()
}
}
lp.parseExpression = function(noIn) {
let start = this.storeCurrentPos()
let expr = this.parseMaybeAssign(noIn)
if (this.tok.type === tt.comma) {
let node = this.startNodeAt(start)
node.expressions = [expr]
while (this.eat(tt.comma)) node.expressions.push(this.parseMaybeAssign(noIn))
return this.finishNode(node, "SequenceExpression")
}
return expr
}
lp.parseParenExpression = function() {
this.pushCx()
this.expect(tt.parenL)
let val = this.parseExpression()
this.popCx()
this.expect(tt.parenR)
return val
}
lp.parseMaybeAssign = function(noIn) {
if (this.toks.isContextual("yield")) {
let node = this.startNode()
this.next()
if (this.semicolon() || this.canInsertSemicolon() || (this.tok.type != tt.star && !this.tok.type.startsExpr)) {
node.delegate = false
node.argument = null
} else {
node.delegate = this.eat(tt.star)
node.argument = this.parseMaybeAssign()
}
return this.finishNode(node, "YieldExpression")
}
let start = this.storeCurrentPos()
let left = this.parseMaybeConditional(noIn)
if (this.tok.type.isAssign) {
let node = this.startNodeAt(start)
node.operator = this.tok.value
node.left = this.tok.type === tt.eq ? this.toAssignable(left) : this.checkLVal(left)
this.next()
node.right = this.parseMaybeAssign(noIn)
return this.finishNode(node, "AssignmentExpression")
}
return left
}
lp.parseMaybeConditional = function(noIn) {
let start = this.storeCurrentPos()
let expr = this.parseExprOps(noIn)
if (this.eat(tt.question)) {
let node = this.startNodeAt(start)
node.test = expr
node.consequent = this.parseMaybeAssign()
node.alternate = this.expect(tt.colon) ? this.parseMaybeAssign(noIn) : this.dummyIdent()
return this.finishNode(node, "ConditionalExpression")
}
return expr
}
lp.parseExprOps = function(noIn) {
let start = this.storeCurrentPos()
let indent = this.curIndent, line = this.curLineStart
return this.parseExprOp(this.parseMaybeUnary(false), start, -1, noIn, indent, line)
}
lp.parseExprOp = function(left, start, minPrec, noIn, indent, line) {
if (this.curLineStart != line && this.curIndent < indent && this.tokenStartsLine()) return left
let prec = this.tok.type.binop
if (prec != null && (!noIn || this.tok.type !== tt._in)) {
if (prec > minPrec) {
let node = this.startNodeAt(start)
node.left = left
node.operator = this.tok.value
this.next()
if (this.curLineStart != line && this.curIndent < indent && this.tokenStartsLine()) {
node.right = this.dummyIdent()
} else {
let rightStart = this.storeCurrentPos()
node.right = this.parseExprOp(this.parseMaybeUnary(false), rightStart, prec, noIn, indent, line)
}
this.finishNode(node, /&&|\|\|/.test(node.operator) ? "LogicalExpression" : "BinaryExpression")
return this.parseExprOp(node, start, minPrec, noIn, indent, line)
}
}
return left
}
lp.parseMaybeUnary = function(sawUnary) {
let start = this.storeCurrentPos(), expr
if (this.tok.type.prefix) {
let node = this.startNode(), update = this.tok.type === tt.incDec
if (!update) sawUnary = true
node.operator = this.tok.value
node.prefix = true
this.next()
node.argument = this.parseMaybeUnary(true)
if (update) node.argument = this.checkLVal(node.argument)
expr = this.finishNode(node, update ? "UpdateExpression" : "UnaryExpression")
} else if (this.tok.type === tt.ellipsis) {
let node = this.startNode()
this.next()
node.argument = this.parseMaybeUnary(sawUnary)
expr = this.finishNode(node, "SpreadElement")
} else {
expr = this.parseExprSubscripts()
while (this.tok.type.postfix && !this.canInsertSemicolon()) {
let node = this.startNodeAt(start)
node.operator = this.tok.value
node.prefix = false
node.argument = this.checkLVal(expr)
this.next()
expr = this.finishNode(node, "UpdateExpression")
}
}
if (!sawUnary && this.eat(tt.starstar)) {
let node = this.startNodeAt(start)
node.operator = "**"
node.left = expr
node.right = this.parseMaybeUnary(false)
return this.finishNode(node, "BinaryExpression")
}
return expr
}
lp.parseExprSubscripts = function() {
let start = this.storeCurrentPos()
return this.parseSubscripts(this.parseExprAtom(), start, false, this.curIndent, this.curLineStart)
}
lp.parseSubscripts = function(base, start, noCalls, startIndent, line) {
for (;;) {
if (this.curLineStart != line && this.curIndent <= startIndent && this.tokenStartsLine()) {
if (this.tok.type == tt.dot && this.curIndent == startIndent)
--startIndent
else
return base
}
if (this.eat(tt.dot)) {
let node = this.startNodeAt(start)
node.object = base
if (this.curLineStart != line && this.curIndent <= startIndent && this.tokenStartsLine())
node.property = this.dummyIdent()
else
node.property = this.parsePropertyAccessor() || this.dummyIdent()
node.computed = false
base = this.finishNode(node, "MemberExpression")
} else if (this.tok.type == tt.bracketL) {
this.pushCx()
this.next()
let node = this.startNodeAt(start)
node.object = base
node.property = this.parseExpression()
node.computed = true
this.popCx()
this.expect(tt.bracketR)
base = this.finishNode(node, "MemberExpression")
} else if (!noCalls && this.tok.type == tt.parenL) {
let node = this.startNodeAt(start)
node.callee = base
node.arguments = this.parseExprList(tt.parenR)
base = this.finishNode(node, "CallExpression")
} else if (this.tok.type == tt.backQuote) {
let node = this.startNodeAt(start)
node.tag = base
node.quasi = this.parseTemplate()
base = this.finishNode(node, "TaggedTemplateExpression")
} else {
return base
}
}
}
lp.parseExprAtom = function() {
let node
switch (this.tok.type) {
case tt._this:
case tt._super:
let type = this.tok.type === tt._this ? "ThisExpression" : "Super"
node = this.startNode()
this.next()
return this.finishNode(node, type)
case tt.name:
let start = this.storeCurrentPos()
let id = this.parseIdent()
return this.eat(tt.arrow) ? this.parseArrowExpression(this.startNodeAt(start), [id]) : id
case tt.regexp:
node = this.startNode()
let val = this.tok.value
node.regex = {pattern: val.pattern, flags: val.flags}
node.value = val.value
node.raw = this.input.slice(this.tok.start, this.tok.end)
this.next()
return this.finishNode(node, "Literal")
case tt.num: case tt.string:
node = this.startNode()
node.value = this.tok.value
node.raw = this.input.slice(this.tok.start, this.tok.end)
this.next()
return this.finishNode(node, "Literal")
case tt._null: case tt._true: case tt._false:
node = this.startNode()
node.value = this.tok.type === tt._null ? null : this.tok.type === tt._true
node.raw = this.tok.type.keyword
this.next()
return this.finishNode(node, "Literal")
case tt.parenL:
let parenStart = this.storeCurrentPos()
this.next()
let inner = this.parseExpression()
this.expect(tt.parenR)
if (this.eat(tt.arrow)) {
return this.parseArrowExpression(this.startNodeAt(parenStart), inner.expressions || (isDummy(inner) ? [] : [inner]))
}
if (this.options.preserveParens) {
let par = this.startNodeAt(parenStart)
par.expression = inner
inner = this.finishNode(par, "ParenthesizedExpression")
}
return inner
case tt.bracketL:
node = this.startNode()
node.elements = this.parseExprList(tt.bracketR, true)
return this.finishNode(node, "ArrayExpression")
case tt.braceL:
return this.parseObj()
case tt._class:
return this.parseClass()
case tt._function:
node = this.startNode()
this.next()
return this.parseFunction(node, false)
case tt._new:
return this.parseNew()
case tt.backQuote:
return this.parseTemplate()
default:
return this.dummyIdent()
}
}
lp.parseNew = function() {
let node = this.startNode(), startIndent = this.curIndent, line = this.curLineStart
let meta = this.parseIdent(true)
if (this.options.ecmaVersion >= 6 && this.eat(tt.dot)) {
node.meta = meta
node.property = this.parseIdent(true)
return this.finishNode(node, "MetaProperty")
}
let start = this.storeCurrentPos()
node.callee = this.parseSubscripts(this.parseExprAtom(), start, true, startIndent, line)
if (this.tok.type == tt.parenL) {
node.arguments = this.parseExprList(tt.parenR)
} else {
node.arguments = []
}
return this.finishNode(node, "NewExpression")
}
lp.parseTemplateElement = function() {
let elem = this.startNode()
elem.value = {
raw: this.input.slice(this.tok.start, this.tok.end).replace(/\r\n?/g, '\n'),
cooked: this.tok.value
}
this.next()
elem.tail = this.tok.type === tt.backQuote
return this.finishNode(elem, "TemplateElement")
}
lp.parseTemplate = function() {
let node = this.startNode()
this.next()
node.expressions = []
let curElt = this.parseTemplateElement()
node.quasis = [curElt]
while (!curElt.tail) {
this.next()
node.expressions.push(this.parseExpression())
if (this.expect(tt.braceR)) {
curElt = this.parseTemplateElement()
} else {
curElt = this.startNode()
curElt.value = {cooked: '', raw: ''}
curElt.tail = true
this.finishNode(curElt, "TemplateElement")
}
node.quasis.push(curElt)
}
this.expect(tt.backQuote)
return this.finishNode(node, "TemplateLiteral")
}
lp.parseObj = function() {
let node = this.startNode()
node.properties = []
this.pushCx()
let indent = this.curIndent + 1, line = this.curLineStart
this.eat(tt.braceL)
if (this.curIndent + 1 < indent) { indent = this.curIndent; line = this.curLineStart }
while (!this.closes(tt.braceR, indent, line)) {
let prop = this.startNode(), isGenerator, start
if (this.options.ecmaVersion >= 6) {
start = this.storeCurrentPos()
prop.method = false
prop.shorthand = false
isGenerator = this.eat(tt.star)
}
this.parsePropertyName(prop)
if (isDummy(prop.key)) { if (isDummy(this.parseMaybeAssign())) this.next(); this.eat(tt.comma); continue }
if (this.eat(tt.colon)) {
prop.kind = "init"
prop.value = this.parseMaybeAssign()
} else if (this.options.ecmaVersion >= 6 && (this.tok.type === tt.parenL || this.tok.type === tt.braceL)) {
prop.kind = "init"
prop.method = true
prop.value = this.parseMethod(isGenerator)
} else if (this.options.ecmaVersion >= 5 && prop.key.type === "Identifier" &&
!prop.computed && (prop.key.name === "get" || prop.key.name === "set") &&
(this.tok.type != tt.comma && this.tok.type != tt.braceR)) {
prop.kind = prop.key.name
this.parsePropertyName(prop)
prop.value = this.parseMethod(false)
} else {
prop.kind = "init"
if (this.options.ecmaVersion >= 6) {
if (this.eat(tt.eq)) {
let assign = this.startNodeAt(start)
assign.operator = "="
assign.left = prop.key
assign.right = this.parseMaybeAssign()
prop.value = this.finishNode(assign, "AssignmentExpression")
} else {
prop.value = prop.key
}
} else {
prop.value = this.dummyIdent()
}
prop.shorthand = true
}
node.properties.push(this.finishNode(prop, "Property"))
this.eat(tt.comma)
}
this.popCx()
if (!this.eat(tt.braceR)) {
// 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 this.finishNode(node, "ObjectExpression")
}
lp.parsePropertyName = function(prop) {
if (this.options.ecmaVersion >= 6) {
if (this.eat(tt.bracketL)) {
prop.computed = true
prop.key = this.parseExpression()
this.expect(tt.bracketR)
return
} else {
prop.computed = false
}
}
let key = (this.tok.type === tt.num || this.tok.type === tt.string) ? this.parseExprAtom() : this.parseIdent()
prop.key = key || this.dummyIdent()
}
lp.parsePropertyAccessor = function() {
if (this.tok.type === tt.name || this.tok.type.keyword) return this.parseIdent()
}
lp.parseIdent = function() {
let name = this.tok.type === tt.name ? this.tok.value : this.tok.type.keyword
if (!name) return this.dummyIdent()
let node = this.startNode()
this.next()
node.name = name
return this.finishNode(node, "Identifier")
}
lp.initFunction = function(node) {
node.id = null
node.params = []
if (this.options.ecmaVersion >= 6) {
node.generator = false
node.expression = false
}
}
// Convert existing expression atom to assignable pattern
// if possible.
lp.toAssignable = function(node, binding) {
if (!node || node.type == "Identifier" || (node.type == "MemberExpression" && !binding)) {
// Okay
} else if (node.type == "ParenthesizedExpression") {
node.expression = this.toAssignable(node.expression, binding)
} else if (this.options.ecmaVersion < 6) {
return this.dummyIdent()
} else if (node.type == "ObjectExpression") {
node.type = "ObjectPattern"
let props = node.properties
for (let i = 0; i < props.length; i++)
props[i].value = this.toAssignable(props[i].value, binding)
} else if (node.type == "ArrayExpression") {
node.type = "ArrayPattern"
this.toAssignableList(node.elements, binding)
} else if (node.type == "SpreadElement") {
node.type = "RestElement"
node.argument = this.toAssignable(node.argument, binding)
} else if (node.type == "AssignmentExpression") {
node.type = "AssignmentPattern"
delete node.operator
} else {
return this.dummyIdent()
}
return node
}
lp.toAssignableList = function(exprList, binding) {
for (let i = 0; i < exprList.length; i++)
exprList[i] = this.toAssignable(exprList[i], binding)
return exprList
}
lp.parseFunctionParams = function(params) {
params = this.parseExprList(tt.parenR)
return this.toAssignableList(params, true)
}
lp.parseMethod = function(isGenerator) {
let node = this.startNode()
this.initFunction(node)
node.params = this.parseFunctionParams()
node.generator = isGenerator || false
node.expression = this.options.ecmaVersion >= 6 && this.tok.type !== tt.braceL
node.body = node.expression ? this.parseMaybeAssign() : this.parseBlock()
return this.finishNode(node, "FunctionExpression")
}
lp.parseArrowExpression = function(node, params) {
this.initFunction(node)
node.params = this.toAssignableList(params, true)
node.expression = this.tok.type !== tt.braceL
node.body = node.expression ? this.parseMaybeAssign() : this.parseBlock()
return this.finishNode(node, "ArrowFunctionExpression")
}
lp.parseExprList = function(close, allowEmpty) {
this.pushCx()
let indent = this.curIndent, line = this.curLineStart, elts = []
this.next() // Opening bracket
while (!this.closes(close, indent + 1, line)) {
if (this.eat(tt.comma)) {
elts.push(allowEmpty ? null : this.dummyIdent())
continue
}
let elt = this.parseMaybeAssign()
if (isDummy(elt)) {
if (this.closes(close, indent, line)) break
this.next()
} else {
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
}
Zerion Mini Shell 1.0