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More Knockout code to ES6

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djmaze 2021-07-29 11:43:47 +02:00
parent b7cb990b00
commit cbecdd93a0
22 changed files with 733 additions and 865 deletions
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54
vendors/knockout/src/binding/bindingProvider.js vendored
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@ -1,22 +1,7 @@
(() => {
const defaultBindingAttributeName = "data-bind",
bindingCache = {},
createBindingsStringEvaluatorViaCache = (bindingsString, cache, options) => {
var cacheKey = bindingsString + (options && options['valueAccessors'] || '');
return cache[cacheKey]
|| (cache[cacheKey] = createBindingsStringEvaluator(bindingsString, options));
},
createBindingsStringEvaluator = (bindingsString, options) => {
// Build the source for a function that evaluates "expression"
// For each scope variable, add an extra level of "with" nesting
// Example result: with(sc1) { with(sc0) { return (expression) } }
var rewrittenBindings = ko.expressionRewriting.preProcessBindings(bindingsString, options),
functionBody = "with($context){with($data||{}){return{" + rewrittenBindings + "}}}";
return new Function("$context", "$element", functionBody);
},
bindingCache = new Map,
// The following function is only used internally by this default provider.
// It's not part of the interface definition for a general binding provider.
@ -26,18 +11,6 @@
case 8: return ko.virtualElements.virtualNodeBindingValue(node); // Comment node
}
return null;
},
// The following function is only used internally by this default provider.
// It's not part of the interface definition for a general binding provider.
parseBindingsString = (bindingsString, bindingContext, node, options) => {
try {
var bindingFunction = createBindingsStringEvaluatorViaCache(bindingsString, bindingCache, options);
return bindingFunction(bindingContext, node);
} catch (ex) {
ex.message = "Unable to parse bindings.\nBindings value: " + bindingsString + "\nMessage: " + ex.message;
throw ex;
}
};
ko.bindingProvider = new class
@ -53,8 +26,29 @@
}
getBindingAccessors(node, bindingContext) {
var bindingsString = getBindingsString(node, bindingContext);
return bindingsString ? parseBindingsString(bindingsString, bindingContext, node, { 'valueAccessors': true }) : null;
var bindingsString = getBindingsString(node);
if (bindingsString) {
try {
let options = { 'valueAccessors': true },
cacheKey = bindingsString,
bindingFunction = bindingCache.get(cacheKey);
if (!bindingFunction) {
// Build the source for a function that evaluates "expression"
// For each scope variable, add an extra level of "with" nesting
// Example result: with(sc1) { with(sc0) { return (expression) } }
var rewrittenBindings = ko.expressionRewriting.preProcessBindings(bindingsString, options),
functionBody = "with($context){with($data||{}){return{" + rewrittenBindings + "}}}";
bindingFunction = new Function("$context", "$element", functionBody);
bindingCache.set(cacheKey, bindingFunction);
}
return bindingFunction(bindingContext, node);
} catch (ex) {
ex.message = "Unable to parse bindings.\nBindings value: " + bindingsString
+ "\nMessage: " + ex.message;
throw ex;
}
}
return null;
}
};