/
set-collapser.js
68 lines (57 loc) · 1.5 KB
/
set-collapser.js
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"use strict";
const Collapser = require("./collapser");
class SetCollapser extends Collapser {
isInitTypeValid(init) {
return (
init.isNewExpression() &&
init.get("callee").isIdentifier() &&
init.node.callee.name === "Set" &&
// other iterables might not be append-able
(init.node.arguments.length === 0 ||
(init.node.arguments.length === 1 &&
init.get("arguments")[0].isArrayExpression()))
);
}
isExpressionTypeValid(expr) {
return expr.isCallExpression();
}
getExpressionChecker(objName, checkReference) {
return expr => {
// checks expr is of form:
// foo.add(rval)
const callee = expr.get("callee");
if (!callee.isMemberExpression()) {
return false;
}
const obj = callee.get("object"),
prop = callee.get("property");
if (
!obj.isIdentifier() ||
obj.node.name !== objName ||
!prop.isIdentifier() ||
prop.node.name !== "add"
) {
return false;
}
const args = expr.get("arguments");
if (args.length !== 1) {
return false;
}
if (checkReference(args[0])) {
return false;
}
return true;
};
}
extractAssignment(expr) {
return expr.node.arguments[0];
}
addSuccessfully(t, arg, init) {
if (init.arguments.length === 0) {
init.arguments.push(t.arrayExpression());
}
init.arguments[0].elements.push(arg);
return true;
}
}
module.exports = SetCollapser;