handlebars.js/lib/handlebars/base.js

var handlebars = require("handlebars/parser").parser;

// BEGIN(BROWSER)
var Handlebars = {};

Handlebars.VERSION = "1.0.beta.2";

Handlebars.Parser = handlebars;

Handlebars.parse = function(string) {
  Handlebars.Parser.yy = Handlebars.AST;
  return Handlebars.Parser.parse(string);
};

Handlebars.print = function(ast) {
  return new Handlebars.PrintVisitor().accept(ast);
};

Handlebars.helpers  = {};
Handlebars.partials = {};

Handlebars.registerHelper = function(name, fn, inverse) {
  if(inverse) { fn.not = inverse; }
  this.helpers[name] = fn;
};

Handlebars.registerPartial = function(name, str) {
  this.partials[name] = str;
};

Handlebars.registerHelper('helperMissing', function(arg) {
  if(arguments.length === 2) {
    return undefined;
  } else {
    throw new Error("Could not find property '" + arg + "'");
  }
});

Handlebars.registerHelper('blockHelperMissing', function(context, options) {
  var inverse = options.inverse || function() {}, fn = options.fn;


  var ret = "";
  var type = Object.prototype.toString.call(context);

  if(type === "[object Function]") {
    context = context();
  }

  if(context === true) {
    return fn(this);
  } else if(context === false || context == null) {
    return inverse(this);
  } else if(type === "[object Array]") {
    if(context.length > 0) {
      for(var i=0, j=context.length; i<j; i++) {
        ret = ret + fn(context[i]);
      }
    } else {
      ret = inverse(this);
    }
    return ret;
  } else {
    return fn(context);
  }
});

Handlebars.registerHelper('each', function(context, options) {
  var fn = options.fn, inverse = options.inverse;
  var ret = "";

  if(context && context.length > 0) {
    for(var i=0, j=context.length; i<j; i++) {
      ret = ret + fn(context[i]);
    }
  } else {
    ret = inverse(this);
  }
  return ret;
});

Handlebars.registerHelper('if', function(context, options) {
  if(!context || Handlebars.Utils.isEmpty(context)) {
    return options.inverse(this);
  } else {
    return options.fn(this);
  }
});

Handlebars.registerHelper('unless', function(context, options) {
  var fn = options.fn, inverse = options.inverse;
  options.fn = inverse;
  options.inverse = fn;

  return Handlebars.helpers['if'].call(this, context, options);
});

Handlebars.registerHelper('with', function(context, options) {
  return options.fn(context);
});

Handlebars.logger = {
  DEBUG: 0, INFO: 1, WARN: 2, ERROR: 3, level: 3,

  // override in the host environment
  log: function(level, str) {}
};

Handlebars.log = function(level, str) { Handlebars.logger.log(level, str); };

// END(BROWSER)

module.exports = Handlebars;