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"use strict";
const Collapser = require("./collapser");
class ArrayCollapser extends Collapser {
isInitTypeValid(init) {
return init.isArrayExpression();
}
isExpressionTypeValid(expr) {
return expr.isCallExpression();
}
getExpressionChecker(objName, checkReference) {
return expr => {
// checks expr is of form:
// foo.push(rval1, ...nrvals)
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 !== "push") {
return false;
}
const args = expr.get("arguments");
if (args.some(checkReference)) {
return false;
}
return true;
};
}
extractAssignment(expr) {
return expr.node.arguments;
}
addSuccessfully(t, args, init) {
args.map(a => init.elements.push(a));
return true;
}
}
module.exports = ArrayCollapser;
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