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107 lines
3.8 KiB
JavaScript

import {ContextualKeyword} from "./keywords";
import { TokenType as tt} from "./types";
export class Scope {
constructor(startTokenIndex, endTokenIndex, isFunctionScope) {
this.startTokenIndex = startTokenIndex;
this.endTokenIndex = endTokenIndex;
this.isFunctionScope = isFunctionScope;
}
}
export class StateSnapshot {
constructor(
potentialArrowAt,
noAnonFunctionType,
inDisallowConditionalTypesContext,
tokensLength,
scopesLength,
pos,
type,
contextualKeyword,
start,
end,
isType,
scopeDepth,
error,
) {;this.potentialArrowAt = potentialArrowAt;this.noAnonFunctionType = noAnonFunctionType;this.inDisallowConditionalTypesContext = inDisallowConditionalTypesContext;this.tokensLength = tokensLength;this.scopesLength = scopesLength;this.pos = pos;this.type = type;this.contextualKeyword = contextualKeyword;this.start = start;this.end = end;this.isType = isType;this.scopeDepth = scopeDepth;this.error = error;}
}
export default class State {constructor() { State.prototype.__init.call(this);State.prototype.__init2.call(this);State.prototype.__init3.call(this);State.prototype.__init4.call(this);State.prototype.__init5.call(this);State.prototype.__init6.call(this);State.prototype.__init7.call(this);State.prototype.__init8.call(this);State.prototype.__init9.call(this);State.prototype.__init10.call(this);State.prototype.__init11.call(this);State.prototype.__init12.call(this);State.prototype.__init13.call(this); }
// Used to signify the start of a potential arrow function
__init() {this.potentialArrowAt = -1}
// Used by Flow to handle an edge case involving function type parsing.
__init2() {this.noAnonFunctionType = false}
// Used by TypeScript to handle ambiguities when parsing conditional types.
__init3() {this.inDisallowConditionalTypesContext = false}
// Token store.
__init4() {this.tokens = []}
// Array of all observed scopes, ordered by their ending position.
__init5() {this.scopes = []}
// The current position of the tokenizer in the input.
__init6() {this.pos = 0}
// Information about the current token.
__init7() {this.type = tt.eof}
__init8() {this.contextualKeyword = ContextualKeyword.NONE}
__init9() {this.start = 0}
__init10() {this.end = 0}
__init11() {this.isType = false}
__init12() {this.scopeDepth = 0}
/**
* If the parser is in an error state, then the token is always tt.eof and all functions can
* keep executing but should be written so they don't get into an infinite loop in this situation.
*
* This approach, combined with the ability to snapshot and restore state, allows us to implement
* backtracking without exceptions and without needing to explicitly propagate error states
* everywhere.
*/
__init13() {this.error = null}
snapshot() {
return new StateSnapshot(
this.potentialArrowAt,
this.noAnonFunctionType,
this.inDisallowConditionalTypesContext,
this.tokens.length,
this.scopes.length,
this.pos,
this.type,
this.contextualKeyword,
this.start,
this.end,
this.isType,
this.scopeDepth,
this.error,
);
}
restoreFromSnapshot(snapshot) {
this.potentialArrowAt = snapshot.potentialArrowAt;
this.noAnonFunctionType = snapshot.noAnonFunctionType;
this.inDisallowConditionalTypesContext = snapshot.inDisallowConditionalTypesContext;
this.tokens.length = snapshot.tokensLength;
this.scopes.length = snapshot.scopesLength;
this.pos = snapshot.pos;
this.type = snapshot.type;
this.contextualKeyword = snapshot.contextualKeyword;
this.start = snapshot.start;
this.end = snapshot.end;
this.isType = snapshot.isType;
this.scopeDepth = snapshot.scopeDepth;
this.error = snapshot.error;
}
}