48 lines
1.6 KiB
JavaScript
48 lines
1.6 KiB
JavaScript
"use strict"
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const tt = require("acorn").tokTypes
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const skipWhiteSpace = /(?:\s|\/\/.*|\/\*[^]*?\*\/)*/g
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const nextTokenIsDot = parser => {
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skipWhiteSpace.lastIndex = parser.pos
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let skip = skipWhiteSpace.exec(parser.input)
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let next = parser.pos + skip[0].length
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return parser.input.slice(next, next + 1) === "."
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}
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module.exports = function(Parser) {
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return class extends Parser {
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parseExprAtom(refDestructuringErrors) {
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if (this.type !== tt._import || !nextTokenIsDot(this)) return super.parseExprAtom(refDestructuringErrors)
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if (!this.options.allowImportExportEverywhere && !this.inModule) {
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this.raise(this.start, "'import' and 'export' may appear only with 'sourceType: module'")
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}
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let node = this.startNode()
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if (this.containsEsc) this.raiseRecoverable(this.start, "Escape sequence in keyword import")
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node.meta = this.parseIdent(true)
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this.expect(tt.dot)
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node.property = this.parseIdent(true)
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if (node.property.name !== "meta") {
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this.raiseRecoverable(node.property.start, "The only valid meta property for import is import.meta")
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}
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if (this.containsEsc) {
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this.raiseRecoverable(node.property.start, "\"meta\" in import.meta must not contain escape sequences")
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}
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return this.finishNode(node, "MetaProperty")
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}
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parseStatement(context, topLevel, exports) {
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if (this.type !== tt._import || !nextTokenIsDot(this)) {
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return super.parseStatement(context, topLevel, exports)
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}
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let node = this.startNode()
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let expr = this.parseExpression()
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return this.parseExpressionStatement(node, expr)
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}
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}
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}
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