/**
 * Copyright (C) 2018 Glayzzle (BSD3 License)
 * @authors https://github.com/glayzzle/php-parser/graphs/contributors
 * @url http://glayzzle.com
 */
"use strict";

const tokens = ";:,.\\[]()|^&+-/*=%!~$<>?@";

module.exports = {
  // check if the char can be a numeric
  is_NUM: function () {
    const ch = this._input.charCodeAt(this.offset - 1);
    return (ch > 47 && ch < 58) || ch === 95;
  },

  // check if the char can be a numeric
  is_NUM_START: function () {
    const ch = this._input.charCodeAt(this.offset - 1);
    return ch > 47 && ch < 58;
  },

  // check if current char can be a label
  is_LABEL: function () {
    const ch = this._input.charCodeAt(this.offset - 1);
    return (
      (ch > 96 && ch < 123) ||
      (ch > 64 && ch < 91) ||
      ch === 95 ||
      (ch > 47 && ch < 58) ||
      ch > 126
    );
  },

  // check if current char can be a label
  is_LABEL_START: function () {
    const ch = this._input.charCodeAt(this.offset - 1);
    // A - Z
    if (ch > 64 && ch < 91) return true;
    // a - z
    if (ch > 96 && ch < 123) return true;
    // _ (95)
    if (ch === 95) return true;
    // utf8 / extended
    if (ch > 126) return true;
    // else
    return false;
  },

  // reads each char of the label
  consume_LABEL: function () {
    while (this.offset < this.size) {
      const ch = this.input();
      if (!this.is_LABEL()) {
        if (ch) this.unput(1);
        break;
      }
    }
    return this;
  },

  // check if current char is a token char
  is_TOKEN: function () {
    const ch = this._input[this.offset - 1];
    return tokens.indexOf(ch) !== -1;
  },
  // check if current char is a whitespace
  is_WHITESPACE: function () {
    const ch = this._input[this.offset - 1];
    return ch === " " || ch === "\t" || ch === "\n" || ch === "\r";
  },
  // check if current char is a whitespace (without newlines)
  is_TABSPACE: function () {
    const ch = this._input[this.offset - 1];
    return ch === " " || ch === "\t";
  },
  // consume all whitespaces (excluding newlines)
  consume_TABSPACE: function () {
    while (this.offset < this.size) {
      const ch = this.input();
      if (!this.is_TABSPACE()) {
        if (ch) this.unput(1);
        break;
      }
    }
    return this;
  },
  // check if current char can be a hexadecimal number
  is_HEX: function () {
    const ch = this._input.charCodeAt(this.offset - 1);
    // 0 - 9
    if (ch > 47 && ch < 58) return true;
    // A - F
    if (ch > 64 && ch < 71) return true;
    // a - f
    if (ch > 96 && ch < 103) return true;
    // _ (code 95)
    if (ch === 95) return true;
    // else
    return false;
  },
  // check if current char can be an octal number
  is_OCTAL: function () {
    const ch = this._input.charCodeAt(this.offset - 1);
    // 0 - 7
    if (ch > 47 && ch < 56) return true;
    // _ (code 95)
    if (ch === 95) return true;
    // else
    return false;
  },
};