@mapbox/jsxtreme-markdown/vendor/remark-parse/lib/util/remove-indentation.js

Transform Markdown into JSX or React component modules

'use strict';

var trim = require('string.prototype.trim');
var repeat = require('repeat-string');
var getIndent = require('./get-indentation');

module.exports = indentation;

var lineFeed = '\n';
var space = ' ';
var exclamationMark = '!';

// Remove the minimum indent from every line in `value`.  Supports both tab,
// spaced, and mixed indentation (as well as possible).
function indentation(value, maximum) {
  var values = value.split(lineFeed);
  var position = values.length + 1;
  var minIndent = Infinity;
  var matrix = [];
  var index;
  var indentation;
  var stops;

  values.unshift(repeat(space, maximum) + exclamationMark);

  while (position--) {
    indentation = getIndent(values[position]);

    matrix[position] = indentation.stops;

    if (trim(values[position]).length === 0) {
      continue;
    }

    if (indentation.indent) {
      if (indentation.indent > 0 && indentation.indent < minIndent) {
        minIndent = indentation.indent;
      }
    } else {
      minIndent = Infinity;

      break;
    }
  }

  if (minIndent !== Infinity) {
    position = values.length;

    while (position--) {
      stops = matrix[position];
      index = minIndent;

      while (index && !(index in stops)) {
        index--;
      }

      values[position] = values[position].slice(stops[index] + 1);
    }
  }

  values.shift();

  return values.join(lineFeed);
}