parjs/dist/internal/state.js

Library for building parsers using combinators.

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
exports.UNINITIALIZED_RESULT = exports.FAIL_RESULT = exports.BasicParsingState = void 0;
const result_1 = require("./result");
function worseThan(a, b) {
    if (a === result_1.ResultKind.Ok) {
        return b === result_1.ResultKind.Ok;
    }
    if (a === result_1.ResultKind.SoftFail) {
        return b === result_1.ResultKind.SoftFail || b === result_1.ResultKind.Ok;
    }
    if (a === result_1.ResultKind.HardFail) {
        return b !== result_1.ResultKind.FatalFail;
    }
    if (a === result_1.ResultKind.FatalFail) {
        return true;
    }
}
/** Basic implementation of the ParsingState interface. */
class BasicParsingState {
    constructor(input, userState) {
        this.input = input;
        this.userState = userState;
        this.position = 0;
        this.stack = [];
        this.initialUserState = undefined;
        this.value = undefined;
    }
    get isOk() {
        return this.kind === result_1.ResultKind.Ok;
    }
    get isSoft() {
        return this.kind === result_1.ResultKind.SoftFail;
    }
    get isHard() {
        return this.kind === result_1.ResultKind.HardFail;
    }
    get isFatal() {
        return this.kind === result_1.ResultKind.FatalFail;
    }
    atLeast(kind) {
        return worseThan(this.kind, kind);
    }
    atMost(kind) {
        return worseThan(kind, this.kind);
    }
}
exports.BasicParsingState = BasicParsingState;
/** A unique object value indicating the reuslt of a failed parser. */
exports.FAIL_RESULT = Object.create(null);
/**
 * A unique object value indicating that a parser did not initialize the ParsingState's value
 * property before terminating, which is an error.
 */
exports.UNINITIALIZED_RESULT = Object.create(null);
// tslint:enable:naming-convention
//# sourceMappingURL=state.js.map