76 lines
2.3 KiB
JavaScript
Executable File
76 lines
2.3 KiB
JavaScript
Executable File
import {reservedWords, keywords} from "./identifier"
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import {types as tt, lineBreak} from "./tokentype"
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export function Parser(options, input, startPos) {
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this.options = options
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this.loadPlugins(this.options.plugins)
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this.sourceFile = this.options.sourceFile || null
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this.isKeyword = keywords[this.options.ecmaVersion >= 6 ? 6 : 5]
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this.isReservedWord = reservedWords[this.options.ecmaVersion]
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this.input = input
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// Set up token state
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// The current position of the tokenizer in the input.
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if (startPos) {
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this.pos = startPos
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this.lineStart = Math.max(0, this.input.lastIndexOf("\n", startPos))
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this.curLine = this.input.slice(0, this.lineStart).split(lineBreak).length
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} else {
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this.pos = this.lineStart = 0
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this.curLine = 1
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}
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// Properties of the current token:
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// Its type
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this.type = tt.eof
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// For tokens that include more information than their type, the value
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this.value = null
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// Its start and end offset
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this.start = this.end = this.pos
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// And, if locations are used, the {line, column} object
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// corresponding to those offsets
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this.startLoc = this.endLoc = null
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// Position information for the previous token
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this.lastTokEndLoc = this.lastTokStartLoc = null
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this.lastTokStart = this.lastTokEnd = this.pos
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// The context stack is used to superficially track syntactic
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// context to predict whether a regular expression is allowed in a
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// given position.
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this.context = this.initialContext()
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this.exprAllowed = true
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// Figure out if it's a module code.
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this.inModule = this.options.sourceType === "module"
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this.strict = this.options.strictMode === false ? false : this.inModule
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// Flags to track whether we are in a function, a generator.
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this.inFunction = this.inGenerator = false
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// Labels in scope.
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this.labels = []
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this.decorators = []
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// If enabled, skip leading hashbang line.
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if (this.pos === 0 && this.options.allowHashBang && this.input.slice(0, 2) === '#!')
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this.skipLineComment(2)
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}
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Parser.prototype.extend = function(name, f) {
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this[name] = f(this[name])
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}
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// Registered plugins
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export const plugins = {}
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Parser.prototype.loadPlugins = function(plugins) {
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for (let name in plugins) {
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let plugin = exports.plugins[name]
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if (!plugin) throw new Error("Plugin '" + name + "' not found")
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plugin(this, plugins[name])
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}
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}
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