json-format/index.js

JSON format for good presentation

/*
  change for npm modules.
  by Luiz Estácio.

  json-format v.1.1
  http://github.com/phoboslab/json-format

  Released under MIT license:
  http://www.opensource.org/licenses/mit-license.php
*/
var p = [],
  indentConfig = {
    tab: { char: '\t', size: 1 },
    space: { char: ' ', size: 4 }
  },
  configDefault = {
    type: 'tab'
  },
  push = function( m ) { return '\\' + p.push( m ) + '\\'; },
  pop = function( m, i ) { return p[i-1] },
  tabs = function( count, indentType) { return new Array( count + 1 ).join( indentType ); };

function JSONFormat ( json, indentType ) {
  p = [];
  var out = "",
      indent = 0;

  // Extract backslashes and strings
  json = json
    .replace( /\\./g, push )
    .replace( /(".*?"|'.*?')/g, push )
    .replace( /\s+/, '' );    

  // Indent and insert newlines
  for( var i = 0; i < json.length; i++ ) {
    var c = json.charAt(i);

    switch(c) {
      case '{':
      case '[':
        out += c + "\n" + tabs(++indent, indentType);
        break;
      case '}':
      case ']':
        out += "\n" + tabs(--indent, indentType) + c;
        break;
      case ',':
        out += ",\n" + tabs(indent, indentType);
        break;
      case ':':
        out += ": ";
        break;
      default:
        out += c;
        break;      
    }         
  }

  // Strip whitespace from numeric arrays and put backslashes 
  // and strings back in
  out = out
    .replace( /\[[\d,\s]+?\]/g, function(m){ return m.replace(/\s/g,''); } )
    .replace( /\\(\d+)\\/g, pop ) // strings
    .replace( /\\(\d+)\\/g, pop ); // backslashes in strings

  return out;
};

module.exports = function(json, config){
  config = config || configDefault;
  var indent = indentConfig[config.type];

  if ( indent == null ) {
    throw new Error('Unrecognized indent type: "' + config.type + '"');
  }
  var indentType = new Array((config.size || indent.size) + 1).join(indent.char);
  return JSONFormat(JSON.stringify(json), indentType);
}