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templateRewriting.js
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templateRewriting.js
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ko.templateRewriting = (function () {
var memoizeBindingAttributeSyntaxRegex = /(<[a-z]+\d*(\s+(?!data-bind=)[a-z0-9]+(=(\"[^\"]*\"|\'[^\']*\'))?)*\s+)data-bind=(["'])([\s\S]*?)\5/g;
return {
ensureTemplateIsRewritten: function (template, templateEngine) {
if (!templateEngine['isTemplateRewritten'](template))
templateEngine['rewriteTemplate'](template, function (htmlString) {
return ko.templateRewriting.memoizeBindingAttributeSyntax(htmlString, templateEngine);
});
},
memoizeBindingAttributeSyntax: function (htmlString, templateEngine) {
return htmlString.replace(memoizeBindingAttributeSyntaxRegex, function () {
var tagToRetain = arguments[1];
var dataBindAttributeValue = arguments[6];
dataBindAttributeValue = ko.jsonExpressionRewriting.insertPropertyAccessorsIntoJson(dataBindAttributeValue);
// For no obvious reason, Opera fails to evaluate dataBindAttributeValue unless it's wrapped in an additional anonymous function,
// even though Opera's built-in debugger can evaluate it anyway. No other browser requires this extra indirection.
var applyBindingsToNextSiblingScript = "ko.templateRewriting.applyMemoizedBindingsToNextSibling(function() { \
return (function() { return { " + dataBindAttributeValue + " } })() \
})";
return templateEngine['createJavaScriptEvaluatorBlock'](applyBindingsToNextSiblingScript) + tagToRetain;
});
},
applyMemoizedBindingsToNextSibling: function (bindings) {
return ko.memoization.memoize(function (domNode, viewModel) {
if (domNode.nextSibling)
ko.applyBindingsToNode(domNode.nextSibling, bindings, viewModel);
});
}
}
})();
ko.exportSymbol('ko.templateRewriting', ko.templateRewriting);
ko.exportSymbol('ko.templateRewriting.applyMemoizedBindingsToNextSibling', ko.templateRewriting.applyMemoizedBindingsToNextSibling); // Exported only because it has to be referenced by string lookup from within rewritten template