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state.ts
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state.ts
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import type { Options } from "../options";
import type * as N from "../types";
import type { CommentWhitespace } from "../parser/comments";
import { Position } from "../util/location";
import { types as ct, type TokContext } from "./context";
import { tt, type TokenType } from "./types";
import type { Errors } from "../parse-error";
import { type ParseError } from "../parse-error";
export type DeferredStrictError =
| typeof Errors.StrictNumericEscape
| typeof Errors.StrictOctalLiteral;
type TopicContextState = {
// When a topic binding has been currently established,
// then this is 1. Otherwise, it is 0. This is forwards compatible
// with a future plugin for multiple lexical topics.
maxNumOfResolvableTopics: number;
// When a topic binding has been currently established, and if that binding
// has been used as a topic reference `#`, then this is 0. Otherwise, it is
// `null`. This is forwards compatible with a future plugin for multiple
// lexical topics.
maxTopicIndex: null | 0;
};
export default class State {
strict: boolean;
curLine: number;
lineStart: number;
// And, if locations are used, the {line, column} object
// corresponding to those offsets
startLoc: Position;
endLoc: Position;
init({ strictMode, sourceType, startLine, startColumn }: Options): void {
this.strict =
strictMode === false
? false
: strictMode === true
? true
: sourceType === "module";
this.curLine = startLine;
this.lineStart = -startColumn;
this.startLoc = this.endLoc = new Position(startLine, startColumn, 0);
}
errors: ParseError<any>[] = [];
// Used to signify the start of a potential arrow function
potentialArrowAt: number = -1;
// Used to signify the start of an expression which looks like a
// typed arrow function, but it isn't
// e.g. a ? (b) : c => d
// ^
noArrowAt: number[] = [];
// Used to signify the start of an expression whose params, if it looks like
// an arrow function, shouldn't be converted to assignable nodes.
// This is used to defer the validation of typed arrow functions inside
// conditional expressions.
// e.g. a ? (b) : c => d
// ^
noArrowParamsConversionAt: number[] = [];
// Flags to track
maybeInArrowParameters: boolean = false;
inType: boolean = false;
noAnonFunctionType: boolean = false;
hasFlowComment: boolean = false;
isAmbientContext: boolean = false;
inAbstractClass: boolean = false;
inDisallowConditionalTypesContext: boolean = false;
// For the Hack-style pipelines plugin
topicContext: TopicContextState = {
maxNumOfResolvableTopics: 0,
maxTopicIndex: null,
};
// For the F#-style pipelines plugin
soloAwait: boolean = false;
inFSharpPipelineDirectBody: boolean = false;
// Labels in scope.
labels: Array<{
kind: "loop" | "switch" | undefined | null;
name?: string | null;
statementStart?: number;
}> = [];
// Leading decorators. Last element of the stack represents the decorators in current context.
// Supports nesting of decorators, e.g. @foo(@bar class inner {}) class outer {}
// where @foo belongs to the outer class and @bar to the inner
decoratorStack: Array<Array<N.Decorator>> = [[]];
// Comment store for Program.comments
comments: Array<N.Comment> = [];
// Comment attachment store
commentStack: Array<CommentWhitespace> = [];
// The current position of the tokenizer in the input.
pos: number = 0;
// Properties of the current token:
// Its type
type: TokenType = tt.eof;
// For tokens that include more information than their type, the value
value: any = null;
// Its start and end offset
start: number = 0;
end: number = 0;
// Position information for the previous token
// this is initialized when generating the second token.
lastTokEndLoc: Position = null;
// this is initialized when generating the second token.
lastTokStartLoc: Position = null;
lastTokStart: number = 0;
// The context stack is used to track whether the apostrophe "`" starts
// or ends a string template
context: Array<TokContext> = [ct.brace];
// Used to track whether a JSX element is allowed to form
canStartJSXElement: boolean = true;
// 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.
containsEsc: boolean = false;
// Used to track invalid escape sequences in template literals,
// that must be reported if the template is not tagged.
firstInvalidTemplateEscapePos: null | Position = null;
// This property is used to track the following errors
// - StrictNumericEscape
// - StrictOctalLiteral
//
// in a literal that occurs prior to/immediately after a "use strict" directive.
// todo(JLHwung): set strictErrors to null and avoid recording string errors
// after a non-directive is parsed
strictErrors: Map<number, [DeferredStrictError, Position]> = new Map();
// Tokens length in token store
tokensLength: number = 0;
curPosition(): Position {
return new Position(this.curLine, this.pos - this.lineStart, this.pos);
}
clone(skipArrays?: boolean): State {
const state = new State();
const keys = Object.keys(this) as (keyof State)[];
for (let i = 0, length = keys.length; i < length; i++) {
const key = keys[i];
let val = this[key];
if (!skipArrays && Array.isArray(val)) {
val = val.slice();
}
// @ts-expect-error val must conform to S[key]
state[key] = val;
}
return state;
}
}
export type LookaheadState = {
pos: number;
value: any;
type: TokenType;
start: number;
end: number;
context: TokContext[];
startLoc: Position;
lastTokEndLoc: Position;
curLine: number;
lineStart: number;
curPosition: () => Position;
/* Used only in readToken_mult_modulo */
inType: boolean;
};