Created
October 31, 2017 13:13
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Codeshift transformation to eliminate redundant A* calls (i.e. where the number of arguments matches the arity of the function)
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| module.exports = function(fileInfo, api, options) { | |
| var source = fileInfo.source, | |
| shift = api.jscodeshift, | |
| shiftSource = shift(fileInfo.source); | |
| var functionMakers = ["F2", "F3", "F4", "F5", "F6", "F7", "F8", "F9"]; | |
| var functionCallers = ["A2", "A3", "A4", "A5", "A6", "A7", "A8", "A9"]; | |
| var arities = {}; | |
| shiftSource | |
| .find(shift.VariableDeclarator) | |
| .filter(function(path) { | |
| return ( | |
| path.value.init && | |
| path.value.init.type === "CallExpression" && | |
| functionMakers.indexOf(path.value.init.callee.name) !== -1 | |
| ); | |
| }) | |
| .forEach(function(path) { | |
| arities[path.value.id.name] = | |
| functionMakers.indexOf(path.value.init.callee.name) + 2; | |
| }); | |
| return shiftSource | |
| .find(shift.CallExpression) | |
| .filter(function(path) { | |
| var calledFunction, specifiedArity; | |
| return ( | |
| functionCallers.indexOf(path.value.callee.name) !== -1 && | |
| (calledFunction = path.value.arguments[0].name) && | |
| (specifiedArity = arities[calledFunction]) && | |
| specifiedArity == path.value.arguments.length - 1 | |
| ); | |
| }) | |
| .map(function(path) { | |
| var args = path.value.arguments; | |
| var calledFunction = args.shift(); | |
| return path.replace( | |
| shift.callExpression( | |
| shift.memberExpression( | |
| calledFunction, | |
| shift.identifier("func") | |
| ), | |
| args | |
| ) | |
| ); | |
| }) | |
| .toSource(); | |
| }; |
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