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/*globals Exception, Utils */
module Utils from "./utils";
import Exception from "./exception";
export var VERSION = "1.1.2";
export var COMPILER_REVISION = 4;
export var REVISION_CHANGES = {
1: '<= 1.0.rc.2', // 1.0.rc.2 is actually rev2 but doesn't report it
2: '== 1.0.0-rc.3',
3: '== 1.0.0-rc.4',
4: '>= 1.0.0'
};
var isArray = Utils.isArray,
isFunction = Utils.isFunction,
toString = Utils.toString,
objectType = '[object Object]';
export function HandlebarsEnvironment(helpers, partials) {
this.helpers = helpers || {};
this.partials = partials || {};
registerDefaultHelpers(this);
}
HandlebarsEnvironment.prototype = {
constructor: HandlebarsEnvironment,
logger: logger,
log: log,
registerHelper: function(name, fn, inverse) {
if (toString.call(name) === objectType) {
if (inverse || fn) { throw new Exception('Arg not supported with multiple helpers'); }
Utils.extend(this.helpers, name);
} else {
if (inverse) { fn.not = inverse; }
this.helpers[name] = fn;
}
},
registerPartial: function(name, str) {
if (toString.call(name) === objectType) {
Utils.extend(this.partials, name);
} else {
this.partials[name] = str;
}
}
};
function registerDefaultHelpers(instance) {
instance.registerHelper('helperMissing', function(arg) {
if(arguments.length === 2) {
return undefined;
} else {
throw new Error("Missing helper: '" + arg + "'");
}
});
instance.registerHelper('blockHelperMissing', function(context, options) {
var inverse = options.inverse || function() {}, fn = options.fn;
if (isFunction(context)) { context = context.call(this); }
if(context === true) {
return fn(this);
} else if(context === false || context == null) {
return inverse(this);
} else if (isArray(context)) {
if(context.length > 0) {
return instance.helpers.each(context, options);
} else {
return inverse(this);
}
} else {
return fn(context);
}
});
instance.registerHelper('each', function(context, options) {
var fn = options.fn, inverse = options.inverse;
var i = 0, ret = "", data;
if (isFunction(context)) { context = context.call(this); }
if (options.data) {
data = createFrame(options.data);
}
if(context && typeof context === 'object') {
if (isArray(context)) {
for(var j = context.length; i<j; i++) {
if (data) {
data.index = i;
data.first = (i === 0)
data.last = (i === (context.length-1));
}
ret = ret + fn(context[i], { data: data });
}
} else {
for(var key in context) {
if(context.hasOwnProperty(key)) {
if(data) { data.key = key; }
ret = ret + fn(context[key], {data: data});
i++;
}
}
}
}
if(i === 0){
ret = inverse(this);
}
return ret;
});
instance.registerHelper('if', function(conditional, options) {
if (isFunction(conditional)) { conditional = conditional.call(this); }
// Default behavior is to render the positive path if the value is truthy and not empty.
// The `includeZero` option may be set to treat the condtional as purely not empty based on the
// behavior of isEmpty. Effectively this determines if 0 is handled by the positive path or negative.
if ((!options.hash.includeZero && !conditional) || Utils.isEmpty(conditional)) {
return options.inverse(this);
} else {
return options.fn(this);
}
});
instance.registerHelper('unless', function(conditional, options) {
return instance.helpers['if'].call(this, conditional, {fn: options.inverse, inverse: options.fn, hash: options.hash});
});
instance.registerHelper('with', function(context, options) {
if (isFunction(context)) { context = context.call(this); }
if (!Utils.isEmpty(context)) return options.fn(context);
});
instance.registerHelper('log', function(context, options) {
var level = options.data && options.data.level != null ? parseInt(options.data.level, 10) : 1;
instance.log(level, context);
});
}
export var logger = {
methodMap: { 0: 'debug', 1: 'info', 2: 'warn', 3: 'error' },
// State enum
DEBUG: 0,
INFO: 1,
WARN: 2,
ERROR: 3,
level: 3,
// can be overridden in the host environment
log: function(level, obj) {
if (logger.level <= level) {
var method = logger.methodMap[level];
if (typeof console !== 'undefined' && console[method]) {
console[method].call(console, obj);
}
}
}
};
export function log(level, obj) { logger.log(level, obj); }
export var createFrame = function(object) {
var obj = {};
Utils.extend(obj, object);
return obj;
};
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