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define([

"./_base/kernel", // kernel.global

"./_base/lang"

], function(kernel, lang){

// module:

// dojo/string

var ESCAPE_REGEXP = /[&<>'"\/]/g;

var ESCAPE_MAP = {

'&': '&',

'<': '<',

'>': '>',

'"': '"',

"'": ''',

'/': '/'

};

var string = {

// summary:

// String utilities for Dojo

};

lang.setObject("dojo.string", string);

string.escape = function(/*String*/str){

// summary:

// Efficiently escape a string for insertion into HTML (innerHTML or attributes), replacing &, <, >, ", ', and / characters.

// str:

// the string to escape

if(!str){ return ""; }

return str.replace(ESCAPE_REGEXP, function(c) {

return ESCAPE_MAP[c];

});

};

// Adapted from https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String/codePointAt#Polyfill

string.codePointAt = String.prototype.codePointAt ?

function (str, position) {

return String.prototype.codePointAt.call(str, position);

} :

function(str, position) {

if (str == null) {

throw new TypeError('codePointAt called on null or undefined');

}

var size;

var first;

var second;

var index;

str = String(str);

size = str.length;

// `ToInteger`

index = position ? Number(position) : 0;

if (index != index) { // better `isNaN`

index = 0;

}

// Account for out-of-bounds indices:

if (index < 0 || index >= size) {

return undefined;

}

// Get the first code unit

first = str.charCodeAt(index);

// check if it's the start of a surrogate pair

if (first >= 0xD800 && first <= 0xDBFF && // high surrogate

size > index + 1 // there is a next code unit

) {

second = str.charCodeAt(index + 1);

if (second >= 0xDC00 && second <= 0xDFFF) { // low surrogate

// https://mathiasbynens.be/notes/javascript-encoding#surrogate-formulae

return (first - 0xD800) * 0x400 + second - 0xDC00 + 0x10000;

}

return first;

};

// Adapted from https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String/fromCodePoint#Polyfill

string.fromCodePoint = String.fromCodePoint || function () {

var codeUnits = [];

var codeLen = 0;

var result = "";

var codePoint;

var index;

for (index = 0, len = arguments.length; index !== len; ++index) {

codePoint = +arguments[index];

// correctly handles all cases including `NaN`, `-Infinity`, `+Infinity`

// The surrounding `!(...)` is required to correctly handle `NaN` cases

// The (codePoint>>>0) === codePoint clause handles decimals and negatives

if (!(codePoint < 0x10FFFF && (codePoint>>>0) === codePoint)) {

throw RangeError("Invalid code point: " + codePoint);

}

if (codePoint <= 0xFFFF) { // BMP code point

codeLen = codeUnits.push(codePoint);

} else { // Astral code point; split in surrogate halves

// https://mathiasbynens.be/notes/javascript-encoding#surrogate-formulae

codePoint -= 0x10000;

codeLen = codeUnits.push(

(codePoint >> 10) + 0xD800, // highSurrogate

(codePoint % 0x400) + 0xDC00 // lowSurrogate

);

}

if (codeLen >= 0x3fff) {

result += String.fromCharCode.apply(null, codeUnits);

codeUnits.length = 0;

}

return result + String.fromCharCode.apply(null, codeUnits);

};

string.rep = function(/*String*/str, /*Integer*/num){

// summary:

// Efficiently replicate a string `n` times.

// str:

// the string to replicate

// num:

// number of times to replicate the string

if(num <= 0 || !str){ return ""; }

var buf = [];

for(;;){

if(num & 1){

buf.push(str);

}

if(!(num >>= 1)){ break; }

str += str;

}

return buf.join(""); // String

};

string.pad = function(/*String*/text, /*Integer*/size, /*String?*/ch, /*Boolean?*/end){

// summary:

// Pad a string to guarantee that it is at least `size` length by

// filling with the character `ch` at either the start or end of the

// string. Pads at the start, by default.

// text:

// the string to pad

// size:

// length to provide padding

// ch:

// character to pad, defaults to '0'

// end:

// adds padding at the end if true, otherwise pads at start

// example:

// | // Fill the string to length 10 with "+" characters on the right. Yields "Dojo++++++".

// | string.pad("Dojo", 10, "+", true);

if(!ch){

ch = '0';

}

var out = String(text),

pad = string.rep(ch, Math.ceil((size - out.length) / ch.length));

return end ? out + pad : pad + out; // String

};

string.substitute = function( /*String*/ template,

/*Object|Array*/map,

/*Function?*/ transform,

/*Object?*/ thisObject){

// summary:

// Performs parameterized substitutions on a string. Throws an

// exception if any parameter is unmatched.

// template:

// a string with expressions in the form `${key}` to be replaced or

// `${key:format}` which specifies a format function. keys are case-sensitive.

// The special sequence `${}` can be used escape `$`.

// map:

// hash to search for substitutions

// transform:

// a function to process all parameters before substitution takes

// place, e.g. mylib.encodeXML

// thisObject:

// where to look for optional format function; default to the global

// namespace

// example:

// Substitutes two expressions in a string from an Array or Object

// | // returns "File 'foo.html' is not found in directory '/temp'."

// | // by providing substitution data in an Array

// | string.substitute(

// | "File '${0}' is not found in directory '${1}'.",

// | ["foo.html","/temp"]

// | );

// |

// | // also returns "File 'foo.html' is not found in directory '/temp'."

// | // but provides substitution data in an Object structure. Dotted

// | // notation may be used to traverse the structure.

// | string.substitute(

// | "File '${name}' is not found in directory '${info.dir}'.",

// | { name: "foo.html", info: { dir: "/temp" } }

// | );

// example:

// Use a transform function to modify the values:

// | // returns "file 'foo.html' is not found in directory '/temp'."

// | string.substitute(

// | "${0} is not found in ${1}.",

// | ["foo.html","/temp"],

// | function(str){

// | // try to figure out the type

// | var prefix = (str.charAt(0) == "/") ? "directory": "file";

// | return prefix + " '" + str + "'";

// | }

// | );

// example:

// Use a formatter

// | // returns "thinger -- howdy"

// | string.substitute(

// | "${0:postfix}", ["thinger"], null, {

// | postfix: function(value, key){

// | return value + " -- howdy";

// | }

// | );

thisObject = thisObject || kernel.global;

transform = transform ?

lang.hitch(thisObject, transform) : function(v){ return v; };

return template.replace(/\$\{([^\s\:\}]*)(?:\:([^\s\:\}]+))?\}/g,

function(match, key, format){

if (key == ''){

return '$';

}

var value = lang.getObject(key, false, map);

if(format){

value = lang.getObject(format, false, thisObject).call(thisObject, value, key);

}

var result = transform(value, key);

if (typeof result === 'undefined') {

throw new Error('string.substitute could not find key "' + key + '" in template');

}

return result.toString();

}); // String

};

string.trim = String.prototype.trim ?

lang.trim : // aliasing to the native function

function(str){

str = str.replace(/^\s+/, '');

for(var i = str.length - 1; i >= 0; i--){

if(/\S/.test(str.charAt(i))){

str = str.substring(0, i + 1);

break;

}

return str;

};

/*=====

string.trim = function(str){

// summary:

// Trims whitespace from both sides of the string

// str: String

// String to be trimmed

// returns: String

// Returns the trimmed string

// description:

// This version of trim() was taken from [Steven Levithan's blog](http://blog.stevenlevithan.com/archives/faster-trim-javascript).

// The short yet performant version of this function is dojo/_base/lang.trim(),

// which is part of Dojo base. Uses String.prototype.trim instead, if available.

return ""; // String

};

=====*/

return string;

});

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