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'use strict';
/**
* @ngdoc function
* @name angular.module.ng.$interpolateProvider
* @function
*
* @description
*
* Used for configuring the interpolation markup. Deafults to `{{` and `}}`.
*/
function $InterpolateProvider() {
var startSymbol = '{{';
var endSymbol = '}}';
/**
* @ngdoc method
* @name angular.module.ng.$interpolateProvider#startSymbol
* @methodOf angular.module.ng.$interpolateProvider
* @description
* Symbol to denote start of expression in the interpolated string. Defaults to `{{`.
*
* @prop {string=} value new value to set the starting symbol to.
*/
this.startSymbol = function(value){
if (value) {
startSymbol = value;
return this;
} else {
return startSymbol;
}
};
/**
* @ngdoc method
* @name angular.module.ng.$interpolateProvider#endSymbol
* @methodOf angular.module.ng.$interpolateProvider
* @description
* Symbol to denote the end of expression in the interpolated string. Defaults to `}}`.
*
* @prop {string=} value new value to set the ending symbol to.
*/
this.endSymbol = function(value){
if (value) {
endSymbol = value;
return this;
} else {
return startSymbol;
}
};
this.$get = ['$parse', function($parse) {
var startSymbolLength = startSymbol.length,
endSymbolLength = endSymbol.length;
/**
* @ngdoc function
* @name angular.module.ng.$interpolate
* @function
*
* @requires $parse
*
* @description
*
* Compiles a string with markup into an interpolation function. This service is used by the
* HTML {@link angular.module.ng.$compile $compile} service for data binding. See
* {@link angular.module.ng.$interpolateProvider $interpolateProvider} for configuring the
* interpolation markup.
*
*
<pre>
var $interpolate = ...; // injected
var exp = $interpolate('Hello {{name}}!');
expect(exp({name:'Angular'}).toEqual('Hello Angular!');
</pre>
*
*
* @param {string} text The text with markup to interpolate.
* @param {boolean=} mustHaveExpression if set to true then the interpolation string must have
* embedded expression in order to return an interpolation function. Strings with no
* embedded expression will return null for the interpolation function.
* @returns {function(context)} an interpolation function which is used to compute the interpolated
* string. The function has these parameters:
*
* * `context`: an object against which any expressions embedded in the strings are evaluated
* against.
*
*/
return function(text, mustHaveExpression) {
var startIndex,
endIndex,
index = 0,
parts = [],
length = text.length,
hasInterpolation = false,
fn,
exp,
concat = [];
while(index < length) {
if ( ((startIndex = text.indexOf(startSymbol, index)) != -1) &&
((endIndex = text.indexOf(endSymbol, startIndex + startSymbolLength)) != -1) ) {
(index != startIndex) && parts.push(text.substring(index, startIndex));
parts.push(fn = $parse(exp = text.substring(startIndex + startSymbolLength, endIndex)));
fn.exp = exp;
index = endIndex + endSymbolLength;
hasInterpolation = true;
} else {
// we did not find anything, so we have to add the remainder to the parts array
(index != length) && parts.push(text.substring(index));
index = length;
}
}
if (!(length = parts.length)) {
// we added, nothing, must have been an empty string.
parts.push('');
length = 1;
}
if (!mustHaveExpression || hasInterpolation) {
concat.length = length;
fn = function(context) {
for(var i = 0, ii = length, part; i<ii; i++) {
if (typeof (part = parts[i]) == 'function') {
part = part(context);
if (part == null || part == undefined) {
part = '';
} else if (typeof part != 'string') {
part = toJson(part);
}
}
concat[i] = part;
}
return concat.join('');
};
fn.exp = text;
fn.parts = parts;
return fn;
}
};
}];
}
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