32 lines
967 B
JavaScript
32 lines
967 B
JavaScript
preventLoop = function(inputFunction){
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if (!_.isFunction(inputFunction)){
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throw new Meteor.Error(
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"Not a function",
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"preventLoop can only take a function as an argument"
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);
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}
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//store a private array of arguments we have been given without returning
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//if we try to visit the same argument twice before resolving its value
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//we are in a dependency loop and need to GTFO
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var visitedArgs = [];
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return function(argument){
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var value;
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//we're still evaluating this attribute, must be in a loop
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if (_.contains(visitedArgs, argument)) {
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console.warn("dependency loop detected");
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return NaN;
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} else {
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//push this skill to the list of visited skills
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//we can't visit it again unless it returns first
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visitedArgs.push(argument);
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}
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try {
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value = inputFunction.call(this, argument);
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} finally{
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//this argument returns or fails, pull it from the array
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visitedArgs = _.without(visitedArgs, argument);
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}
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return value;
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};
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};
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