@airtasker/form-schema-compiler/lib/tokenizers/createInputStream.js

a form schema compiler

"use strict";

exports.__esModule = true;

function _typeof(obj) { if (typeof Symbol === "function" && typeof Symbol.iterator === "symbol") { _typeof = function _typeof(obj) { return typeof obj; }; } else { _typeof = function _typeof(obj) { return obj && typeof Symbol === "function" && obj.constructor === Symbol && obj !== Symbol.prototype ? "symbol" : typeof obj; }; } return _typeof(obj); }

/**
 * transpiling string input to a stream
 * @param input:string
 * @returns {{next: (function()), peek: (function(): string), eof: (function(): boolean), croak: (function(*)), position: (function(): {pos: number, line: number, col: number})}}
 */
var createInputStream = function createInputStream(input) {
  if (typeof input !== "string") {
    throw new Error("expression must be a string instead of " + _typeof(input));
  }

  var pos = 0;
  var line = 1;
  var col = 0;

  var next = function next() {
    var ch = input.charAt(pos);
    pos += 1;

    if (ch === "\n") {
      line += 1;
      col = 0;
    } else {
      col += 1;
    }

    return ch;
  };

  var peek = function peek() {
    return input.charAt(pos);
  };

  var eof = function eof() {
    return peek() === "";
  };

  var croak = function croak(msg) {
    throw new Error("".concat(msg, " (").concat(line, ":").concat(col, ")"));
  };

  var position = function position() {
    return {
      pos: pos,
      line: line,
      col: col
    };
  };

  return {
    next: next,
    peek: peek,
    eof: eof,
    croak: croak,
    position: position
  };
};

exports["default"] = createInputStream;