@cheap-glitch/jsonast/dist/character-stream.js

A JSON to AST parser which allows error recovery.

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
exports.CharacterStream = void 0;
class CharacterStream {
    constructor(text) {
        this._offset = 0;
        this._line = 1;
        this._column = 1;
        this.text = text;
    }
    get ch() {
        return this.text.charAt(this._offset);
    }
    get eoi() {
        return this.text.length === this._offset;
    }
    get line() {
        return this._line;
    }
    get column() {
        return this._column;
    }
    get offset() {
        return this._offset;
    }
    get pos() {
        return {
            line: this.line,
            column: this.column,
            char: this.offset,
        };
    }
    expect(text) {
        if (this.ch !== text) {
            const ch = this.ch
                .replace('\n', '\\n')
                .replace('\r', '\\r')
                .replace('\t', '\\t');
            throw new Error(`Unexpected character '${ch}' at ${this.line}:${this.column}. Expected '${text}'`);
        }
    }
    next() {
        if (this.ch === '\n') {
            this._column = 1;
            this._line++;
        }
        else {
            this._column++;
        }
        this._offset++;
    }
    accept(text) {
        this.expect(text);
        this.next();
    }
    skip(text) {
        if (this.ch === text) {
            this.next();
            return true;
        }
        return false;
    }
}
exports.CharacterStream = CharacterStream;