83 lines
2.2 KiB
JavaScript
83 lines
2.2 KiB
JavaScript
import { Position } from "../util/location";
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import { types as ct } from "./context";
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import { types as tt } from "./types";
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export default class State {
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init(options, input) {
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// strict
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this.strict = options.strictMode === false ? false : options.sourceType === "module";
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this.input = input;
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// Used to signify the start of a potential arrow function
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this.potentialArrowAt = -1;
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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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// Leading decorators.
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this.decorators = [];
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// Token store.
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this.tokens = [];
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// Comment store.
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this.comments = [];
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// Comment attachment store
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this.trailingComments = [];
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this.leadingComments = [];
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this.commentStack = [];
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// The current position of the tokenizer in the input.
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this.pos = this.lineStart = 0;
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this.curLine = 1;
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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 = this.curPosition();
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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 = [ct.b_stat];
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this.exprAllowed = true;
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// Used to signal to callers of `readWord1` whether the word
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// contained any escape sequences. This is needed because words with
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// escape sequences must not be interpreted as keywords.
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this.containsEsc = false;
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return this;
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}
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curPosition() {
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return new Position(this.curLine, this.pos - this.lineStart);
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}
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clone() {
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var state = new State;
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for (var key in this) {
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var val = this[key];
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if (Array.isArray(val)) val = val.slice();
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state[key] = val;
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}
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return state;
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}
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}
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