Initial commit

node_modules/acorn/src/state.js

@@ -0,0 +1,104 @@
+import {reservedWords, keywords} from "./identifier"
+import {types as tt} from "./tokentype"
+import {lineBreak} from "./whitespace"
+import {getOptions} from "./options"
+
+// Registered plugins
+export const plugins = {}
+
+function keywordRegexp(words) {
+  return new RegExp("^(" + words.replace(/ /g, "|") + ")$")
+}
+
+export class Parser {
+  constructor(options, input, startPos) {
+    this.options = options = getOptions(options)
+    this.sourceFile = options.sourceFile
+    this.keywords = keywordRegexp(keywords[options.ecmaVersion >= 6 ? 6 : 5])
+    let reserved = options.allowReserved ? "" :
+        reservedWords[options.ecmaVersion] + (options.sourceType == "module" ? " await" : "")
+    this.reservedWords = keywordRegexp(reserved)
+    let reservedStrict = (reserved ? reserved + " " : "") + reservedWords.strict
+    this.reservedWordsStrict = keywordRegexp(reservedStrict)
+    this.reservedWordsStrictBind = keywordRegexp(reservedStrict + " " + reservedWords.strictBind)
+    this.input = String(input)
+
+    // Used to signal to callers of `readWord1` whether the word
+    // contained any escape sequences. This is needed because words with
+    // escape sequences must not be interpreted as keywords.
+    this.containsEsc = false
+
+    // Load plugins
+    this.loadPlugins(options.plugins)
+
+    // Set up token state
+
+    // The current position of the tokenizer in the input.
+    if (startPos) {
+      this.pos = startPos
+      this.lineStart = Math.max(0, this.input.lastIndexOf("\n", startPos))
+      this.curLine = this.input.slice(0, this.lineStart).split(lineBreak).length
+    } else {
+      this.pos = this.lineStart = 0
+      this.curLine = 1
+    }
+
+    // Properties of the current token:
+    // Its type
+    this.type = tt.eof
+    // For tokens that include more information than their type, the value
+    this.value = null
+    // Its start and end offset
+    this.start = this.end = this.pos
+    // And, if locations are used, the {line, column} object
+    // corresponding to those offsets
+    this.startLoc = this.endLoc = this.curPosition()
+
+    // Position information for the previous token
+    this.lastTokEndLoc = this.lastTokStartLoc = null
+    this.lastTokStart = this.lastTokEnd = this.pos
+
+    // The context stack is used to superficially track syntactic
+    // context to predict whether a regular expression is allowed in a
+    // given position.
+    this.context = this.initialContext()
+    this.exprAllowed = true
+
+    // Figure out if it's a module code.
+    this.strict = this.inModule = options.sourceType === "module"
+
+    // Used to signify the start of a potential arrow function
+    this.potentialArrowAt = -1
+
+    // Flags to track whether we are in a function, a generator.
+    this.inFunction = this.inGenerator = false
+    // Labels in scope.
+    this.labels = []
+
+    // If enabled, skip leading hashbang line.
+    if (this.pos === 0 && options.allowHashBang && this.input.slice(0, 2) === '#!')
+      this.skipLineComment(2)
+  }
+
+  // DEPRECATED Kept for backwards compatibility until 3.0 in case a plugin uses them
+  isKeyword(word) { return this.keywords.test(word) }
+  isReservedWord(word) { return this.reservedWords.test(word) }
+
+  extend(name, f) {
+    this[name] = f(this[name])
+  }
+
+  loadPlugins(pluginConfigs) {
+    for (let name in pluginConfigs) {
+      let plugin = plugins[name]
+      if (!plugin) throw new Error("Plugin '" + name + "' not found")
+      plugin(this, pluginConfigs[name])
+    }
+  }
+
+  parse() {
+    let node = this.options.program || this.startNode()
+    this.nextToken()
+    return this.parseTopLevel(node)
+  }
+}