@mapbox/jsxtreme-markdown/vendor/remark-parse/lib/tokenize/code-indented.js

Transform Markdown into JSX or React component modules

'use strict';

var repeat = require('repeat-string');
var trim = require('trim-trailing-lines');

module.exports = indentedCode;

var lineFeed = '\n';
var tab = '\t';
var space = ' ';

var tabSize = 4;
var codeIndent = repeat(space, tabSize);

function indentedCode(eat, value, silent) {
  var index = -1;
  var length = value.length;
  var subvalue = '';
  var content = '';
  var subvalueQueue = '';
  var contentQueue = '';
  var character;
  var blankQueue;
  var indent;

  while (++index < length) {
    character = value.charAt(index);

    if (indent) {
      indent = false;

      subvalue += subvalueQueue;
      content += contentQueue;
      subvalueQueue = '';
      contentQueue = '';

      if (character === lineFeed) {
        subvalueQueue = character;
        contentQueue = character;
      } else {
        subvalue += character;
        content += character;

        while (++index < length) {
          character = value.charAt(index);

          if (!character || character === lineFeed) {
            contentQueue = character;
            subvalueQueue = character;
            break;
          }

          subvalue += character;
          content += character;
        }
      }
    } else if (
      character === space &&
      value.charAt(index + 1) === character &&
      value.charAt(index + 2) === character &&
      value.charAt(index + 3) === character
    ) {
      subvalueQueue += codeIndent;
      index += 3;
      indent = true;
    } else if (character === tab) {
      subvalueQueue += character;
      indent = true;
    } else {
      blankQueue = '';

      while (character === tab || character === space) {
        blankQueue += character;
        character = value.charAt(++index);
      }

      if (character !== lineFeed) {
        break;
      }

      subvalueQueue += blankQueue + character;
      contentQueue += character;
    }
  }

  if (content) {
    if (silent) {
      return true;
    }

    return eat(subvalue)({
      type: 'code',
      lang: null,
      meta: null,
      value: trim(content),
    });
  }
}