dojo.provide("dojox.dtl.filter.strings");

dojo.require("dojox.dtl.filter.htmlstrings");
dojo.require("dojox.string.sprintf");
dojo.require("dojox.string.tokenize");

dojo.mixin(dojox.dtl.filter.strings, {
	_urlquote: function(/*String*/ url, /*String?*/ safe){
		if(!safe){
			safe = "/";
		}
		return dojox.string.tokenize(url, /([^\w-_.])/g, function(token){
			if(safe.indexOf(token) == -1){
				if(token == " "){
					return "+";
				}else{
					return "%" + token.charCodeAt(0).toString(16).toUpperCase();
				}
			}
			return token;
		}).join("");
	},
	addslashes: function(value){
		// summary: Adds slashes - useful for passing strings to JavaScript, for example.
		return value.replace(/\\/g, "\\\\").replace(/"/g, '\\"').replace(/'/g, "\\'");
	},
	capfirst: function(value){
		// summary: Capitalizes the first character of the value
		value = "" + value;
		return value.charAt(0).toUpperCase() + value.substring(1);
	},
	center: function(value, arg){
		// summary: Centers the value in a field of a given width
		arg = arg || value.length;
		value = value + "";
		var diff = arg - value.length;
		if(diff % 2){
			value = value + " ";
			diff -= 1;
		}
		for(var i = 0; i < diff; i += 2){
			value = " " + value + " ";
		}
		return value;
	},
	cut: function(value, arg){
		// summary: Removes all values of arg from the given string
		arg = arg + "" || "";
		value = value + "";
		return value.replace(new RegExp(arg, "g"), "");
	},
	_fix_ampersands: /&(?!(\w+|#\d+);)/g,
	fix_ampersands: function(value){
		// summary: Replaces ampersands with ``&amp;`` entities
		return value.replace(dojox.dtl.filter.strings._fix_ampersands, "&amp;");
	},
	floatformat: function(value, arg){
		// summary: Format a number according to arg
		// description:
		//		If called without an argument, displays a floating point
		//		number as 34.2 -- but only if there's a point to be displayed.
		//		With a positive numeric argument, it displays that many decimal places
		//		always.
		//		With a negative numeric argument, it will display that many decimal
		//		places -- but only if there's places to be displayed.
		arg = parseInt(arg || -1);
		value = parseFloat(value);
		var m = value - value.toFixed(0);
		if(!m && arg < 0){
			return value.toFixed();
		}
		value = value.toFixed(Math.abs(arg));
		return (arg < 0) ? parseFloat(value) + "" : value;
	},
	iriencode: function(value){
		return dojox.dtl.filter.strings._urlquote(value, "/#%[]=:;$&()+,!");
	},
	linenumbers: function(value){
		// summary: Displays text with line numbers
		var df = dojox.dtl.filter;
		var lines = value.split("\n");
		var output = [];
		var width = (lines.length + "").length;
		for(var i = 0, line; i < lines.length; i++){
			line = lines[i];
			output.push(df.strings.ljust(i + 1, width) + ". " + dojox.dtl._base.escape(line));
		}
		return output.join("\n");
	},
	ljust: function(value, arg){
		value = value + "";
		arg = parseInt(arg);
		while(value.length < arg){
			value = value + " ";
		}
		return value;
	},
	lower: function(value){
		// summary: Converts a string into all lowercase
		return (value + "").toLowerCase();
	},
	make_list: function(value){
		// summary:
		//		Returns the value turned into a list. For an integer, it's a list of
		//		digits. For a string, it's a list of characters.
		var output = [];
		if(typeof value == "number"){
			value = value + "";
		}
		if(value.charAt){
			for(var i = 0; i < value.length; i++){
				output.push(value.charAt(i));
			}
			return output;
		}
		if(typeof value == "object"){
			for(var key in value){
				output.push(value[key]);
			}
			return output;
		}
		return [];
	},
	rjust: function(value, arg){
		value = value + "";
		arg = parseInt(arg);
		while(value.length < arg){
			value = " " + value;
		}
		return value;
	},
	slugify: function(value){
		// summary: Converts to lowercase, removes
		//		non-alpha chars and converts spaces to hyphens
		value = value.replace(/[^\w\s-]/g, "").toLowerCase();
		return value.replace(/[\-\s]+/g, "-");
	},
	_strings: {},
	stringformat: function(value, arg){
		// summary:
		//		Formats the variable according to the argument, a string formatting specifier.
		//		This specifier uses Python string formating syntax, with the exception that
		//		the leading "%" is dropped.
		arg = "" + arg;
		var strings = dojox.dtl.filter.strings._strings;
		if(!strings[arg]){
			strings[arg] = new dojox.string.sprintf.Formatter("%" + arg);
		}
		return strings[arg].format(value);
	},
	title: function(value){
		// summary: Converts a string into titlecase
		var last, title = "";
		for(var i = 0, current; i < value.length; i++){
			current = value.charAt(i);
			if(last == " " || last == "\n" || last == "\t" || !last){
				title += current.toUpperCase();
			}else{
				title += current.toLowerCase();
			}
			last = current;
		}
		return title;
	},
	_truncatewords: /[ \n\r\t]/,
	truncatewords: function(value, arg){
		// summary: Truncates a string after a certain number of words
		// arg: Integer
		//		Number of words to truncate after
		arg = parseInt(arg);
		if(!arg){
			return value;
		}

		for(var i = 0, j = value.length, count = 0, current, last; i < value.length; i++){
			current = value.charAt(i);
			if(dojox.dtl.filter.strings._truncatewords.test(last)){
				if(!dojox.dtl.filter.strings._truncatewords.test(current)){
					++count;
					if(count == arg){
						return value.substring(0, j + 1);
					}
				}
			}else if(!dojox.dtl.filter.strings._truncatewords.test(current)){
				j = i;
			}
			last = current;
		}
		return value;
	},
	_truncate_words: /(&.*?;|<.*?>|(\w[\w\-]*))/g,
	_truncate_tag: /<(\/)?([^ ]+?)(?: (\/)| .*?)?>/,
	_truncate_singlets: { br: true, col: true, link: true, base: true, img: true, param: true, area: true, hr: true, input: true },
	truncatewords_html: function(value, arg){
		arg = parseInt(arg);

		if(arg <= 0){
			return "";
		}

		var strings = dojox.dtl.filter.strings;
		var words = 0;
		var open = [];

		var output = dojox.string.tokenize(value, strings._truncate_words, function(all, word){
			if(word){
				// It's an actual non-HTML word
				++words;
				if(words < arg){
					return word;
				}else if(words == arg){
					return word + " ...";
				}
			}
			// Check for tag
			var tag = all.match(strings._truncate_tag);
			if(!tag || words >= arg){
				// Don't worry about non tags or tags after our truncate point
				return;
			}
			var closing = tag[1];
			var tagname = tag[2].toLowerCase();
			var selfclosing = tag[3];
			if(closing || strings._truncate_singlets[tagname]){
			}else if(closing){
				var i = dojo.indexOf(open, tagname);
				if(i != -1){
					open = open.slice(i + 1);
				}
			}else{
				open.unshift(tagname);
			}
			return all;
		}).join("");

		output = output.replace(/\s+$/g, "");

		for(var i = 0, tag; tag = open[i]; i++){
			output += "</" + tag + ">";
		}

		return output;
	},
	upper: function(value){
		return value.toUpperCase();
	},
	urlencode: function(value){
		return dojox.dtl.filter.strings._urlquote(value);
	},
	_urlize: /^((?:[(>]|&lt;)*)(.*?)((?:[.,)>\n]|&gt;)*)$/,
	_urlize2: /^\S+@[a-zA-Z0-9._-]+\.[a-zA-Z0-9._-]+$/,
	urlize: function(value){
		return dojox.dtl.filter.strings.urlizetrunc(value);
	},
	urlizetrunc: function(value, arg){
		arg = parseInt(arg);
		return dojox.string.tokenize(value, /(\S+)/g, function(word){
			var matches = dojox.dtl.filter.strings._urlize.exec(word);
			if(!matches){
				return word;
			}
			var lead = matches[1];
			var middle = matches[2];
			var trail = matches[3];

			var startsWww = middle.indexOf("www.") == 0;
			var hasAt = middle.indexOf("@") != -1;
			var hasColon = middle.indexOf(":") != -1;
			var startsHttp = middle.indexOf("http://") == 0;
			var startsHttps = middle.indexOf("https://") == 0;
			var firstAlpha = /[a-zA-Z0-9]/.test(middle.charAt(0));
			var last4 = middle.substring(middle.length - 4);

			var trimmed = middle;
			if(arg > 3){
				trimmed = trimmed.substring(0, arg - 3) + "...";
			}

			if(startsWww || (!hasAt && !startsHttp && middle.length && firstAlpha && (last4 == ".org" || last4 == ".net" || last4 == ".com"))){
				return '<a href="http://' + middle + '" rel="nofollow">' + trimmed + '</a>';
			}else if(startsHttp || startsHttps){
				return '<a href="' + middle + '" rel="nofollow">' + trimmed + '</a>';
			}else if(hasAt && !startsWww && !hasColon && dojox.dtl.filter.strings._urlize2.test(middle)){
				return '<a href="mailto:' + middle + '">' + middle + '</a>';
			}
			return word;
		}).join("");
	},
	wordcount: function(value){
		value = dojo.trim(value);
		if(!value){ return 0; }
		return value.split(/\s+/g).length;
	},
	wordwrap: function(value, arg){
		arg = parseInt(arg);
		// summary: Wraps words at specified line length
		var output = [];
		var parts = value.split(/\s+/g);
		if(parts.length){
			var word = parts.shift();
			output.push(word);
			var pos = word.length - word.lastIndexOf("\n") - 1;
			for(var i = 0; i < parts.length; i++){
				word = parts[i];
				if(word.indexOf("\n") != -1){
					var lines = word.split(/\n/g);
				}else{
					var lines = [word];
				}
				pos += lines[0].length + 1;
				if(arg && pos > arg){
					output.push("\n");
					pos = lines[lines.length - 1].length;
				}else{
					output.push(" ");
					if(lines.length > 1){
						pos = lines[lines.length - 1].length;
					}
				}
				output.push(word);
			}
		}
		return output.join("");
	}
});