text: 'use strict';
  
  const utils = require('./utils');
  
  function parser(code, options, config) {
  
      if (typeof code !== 'string') {
          throw new TypeError('Input code/text/html must be a string.');
      }
  
      if (options !== undefined && typeof(options) !== 'object') {
          throw new TypeError('Parameter \'options\' must be an object.');
      }
  
      const len = code.length, // code length;
          optSafe = options && options.safe, // 'safe' option;
          optSpace = options && options.space, // 'space' option;
          optTrim = options && options.trim, // 'trim' option;
          EOL = utils.getEOL(code); // get EOL from the code;
  
      let idx = 0, // current index;
          s = '', // resulting code;
          emptyLine = true, // set while no symbols encountered on the current line;
          emptyLetters = '', // empty letters on a new line;
          isHtml, // set when the input is recognized as HTML;
          regEx = []; // regular expression details;
  
      if (!len) {
          return code;
      }
  
      if (config.parse) {
          isHtml = utils.isHtml(code);
          if (!isHtml) {
              regEx = utils.parseRegEx(code);
          }
      } else {
          isHtml = config.html;
      }
  
      if (options && options.ignore) {
          let ignore = options.ignore;
          if (ignore instanceof RegExp) {
              ignore = [ignore];
          } else {
              if (ignore instanceof Array) {
                  ignore = ignore.filter(f => f instanceof RegExp);
                  if (!ignore.length) {
                      ignore = null;
                  }
              } else {
                  ignore = null;
              }
          }
          if (ignore) {
              for (let i = 0; i < ignore.length; i++) {
                  const reg = ignore[i];
                  let match;
                  do {
                      match = reg.exec(code);
                      if (match) {
                          regEx.push({
                              start: match.index,
                              end: match.index + match[0].length - 1
                          });
                      }
                  } while (match && reg.global);
              }
              regEx = regEx.sort((a, b) => a.start - b.start);
          }
      }
  
      do {
          if (!isHtml && code[idx] === '/' && idx < len - 1 && (!idx || code[idx - 1] !== '\\')) {
              if (code[idx + 1] === '/') {
                  if (inRegEx()) {
                      if (emptyLetters) {
                          s += emptyLetters;
                          emptyLetters = '';
                      }
                      s += '/';
                      continue;
                  }
                  const lb1 = code.indexOf(EOL, idx + 2);
                  if (lb1 < 0) {
                      break;
                  }
                  if (emptyLine) {
                      emptyLetters = '';
                      if (optSpace) {
                          idx = lb1 - 1; // just before the line break;
                      } else {
                          idx = lb1 + EOL.length - 1; // last symbol of the line break;
                          trim();
                      }
                  } else {
                      idx = lb1 - 1; // just before the line break;
                  }
                  continue;
              }
              if (code[idx + 1] === '*') {
                  if (inRegEx()) {
                      if (emptyLetters) {
                          s += emptyLetters;
                          emptyLetters = '';
                      }
                      s += '/';
                      continue;
                  }
                  const end1 = code.indexOf('*/', idx + 2),
                      keep1 = optSafe && idx < len - 2 && code[idx + 2] === '!';
                  if (keep1) {
                      if (end1 >= 0) {
                          s += code.substr(idx, end1 - idx + 2);
                      } else {
                          s += code.substr(idx, len - idx);
                      }
                  }
                  if (end1 < 0) {
                      break;
                  }
                  const comment1 = code.substr(idx, end1 - idx + 2);
                  idx = end1 + 1;
                  if (emptyLine) {
                      emptyLetters = '';
                  }
                  if (!keep1) {
                      const parts1 = comment1.split(EOL);
                      if (optSpace) {
                          for (let k1 = 0; k1 < parts1.length - 1; k1++) {
                              s += EOL;
                          }
                      }
                      const lb2 = code.indexOf(EOL, idx + 1);
                      if (lb2 > idx) {
                          let gapIdx1 = lb2 - 1;
                          while ((code[gapIdx1] === ' ' || code[gapIdx1] === '\t') && --gapIdx1 > idx) ;
                          if (gapIdx1 === idx) {
                              if (emptyLine && !optSpace) {
                                  idx = lb2 + EOL.length - 1; // last symbol of the line break;
                                  trim();
                              }
                          } else {
                              if (optSpace) {
                                  s += utils.getSpaces(parts1[parts1.length - 1].length);
                              }
                          }
                      } else {
                          if (optSpace) {
                              let gapIdx2 = idx + 1;
                              while ((code[gapIdx2] === ' ' || code[gapIdx2] === '\t') && ++gapIdx2 < len) ;
                              if (gapIdx2 < len) {
                                  s += utils.getSpaces(parts1[parts1.length - 1].length);
                              }
                          }
                      }
                  }
                  continue;
              }
          }
  
          if (isHtml && code[idx] === '<' && idx < len - 3 && code.substr(idx + 1, 3) === '!--') {
              if (inRegEx()) {
                  if (emptyLetters) {
                      s += emptyLetters;
                      emptyLetters = '';
                  }
                  s += '<';
                  continue;
              }
              const end2 = code.indexOf('-->', idx + 4),
                  keep2 = optSafe && code.substr(idx + 4, 3) === '[if';
              if (keep2) {
                  if (end2 >= 0) {
                      s += code.substr(idx, end2 - idx + 3);
                  } else {
                      s += code.substr(idx, len - idx);
                  }
              }
              if (end2 < 0) {
                  break;
              }
              const comment2 = code.substr(idx, end2 - idx + 3);
              idx = end2 + 2;
              if (emptyLine) {
                  emptyLetters = '';
              }
              if (!keep2) {
                  const parts2 = comment2.split(EOL);
                  if (optSpace) {
                      for (let k2 = 0; k2 < parts2.length - 1; k2++) {
                          s += EOL;
                      }
                  }
                  const lb3 = code.indexOf(EOL, idx + 1);
                  if (lb3 > idx) {
                      let gapIdx3 = lb3 - 1;
                      while ((code[gapIdx3] === ' ' || code[gapIdx3] === '\t') && --gapIdx3 > idx) ;
                      if (gapIdx3 === idx) {
                          if (emptyLine && !optSpace) {
                              idx = lb3 + EOL.length - 1; // last symbol of the line break;
                              trim();
                          }
                      } else {
                          if (optSpace) {
                              s += utils.getSpaces(parts2[parts2.length - 1].length);
                          }
                      }
                  } else {
                      if (optSpace) {
                          let gapIdx4 = idx + 1;
                          while ((code[gapIdx4] === ' ' || code[gapIdx4] === '\t') && ++gapIdx4 < len) ;
                          if (gapIdx4 < len) {
                              s += utils.getSpaces(parts2[parts2.length - 1].length);
                          }
                      }
                  }
              }
              continue;
          }
  
          const symbol = code[idx],
              isSpace = symbol === ' ' || symbol === '\t';
          if (symbol === '\r' || symbol === '\n') {
              if (code.indexOf(EOL, idx) === idx) {
                  emptyLine = true;
              }
          } else {
              if (!isSpace) {
                  emptyLine = false;
                  s += emptyLetters;
                  emptyLetters = '';
              }
          }
          if (emptyLine && isSpace) {
              emptyLetters += symbol;
          } else {
              s += symbol;
          }
  
          if (!isHtml && (symbol === '\'' || symbol === '"' || symbol === '`') && (!idx || code[idx - 1] !== '\\')) {
              if (inRegEx()) {
                  continue;
              }
              let closeIdx = idx;
              do {
                  closeIdx = code.indexOf(symbol, closeIdx + 1);
                  if (closeIdx > 0) {
                      let shIdx = closeIdx;
                      while (code[--shIdx] === '\\') ;
                      if ((closeIdx - shIdx) % 2) {
                          break;
                      }
                  }
              } while (closeIdx > 0);
              if (closeIdx < 0) {
                  break;
              }
              s += code.substr(idx + 1, closeIdx - idx);
              idx = closeIdx;
          }
  
      } while (++idx < len);
  
      function inRegEx() {
          if (regEx.length) {
              return utils.indexInRegEx(idx, regEx);
          }
      }
  
      function trim() {
          if (optTrim) {
              let startIdx, endIdx, i;
              do {
                  startIdx = idx + 1;
                  endIdx = code.indexOf(EOL, startIdx);
                  i = startIdx;
                  while ((code[i] === ' ' || code[i] === '\t') && ++i < endIdx) ;
                  if (i === endIdx) {
                      idx = endIdx + EOL.length - 1;
                  }
              } while (i === endIdx);
          }
      }
  
      return s;
  }
  
  module.exports = parser;
  