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refactor(simplify): hoist path.get calls #858

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merged 1 commit into from
May 17, 2018
Merged

refactor(simplify): hoist path.get calls #858

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47 changes: 27 additions & 20 deletions packages/babel-plugin-minify-simplify/src/index.js
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Original file line number Diff line number Diff line change
Expand Up @@ -946,47 +946,54 @@ module.exports = ({ types: t }) => {
}

function earlyReturnTransform(path) {
const { node } = path;
const block = path.get("body");

if (!t.isBlockStatement(node.body)) {
if (!block.isBlockStatement()) {
return;
}

for (let i = node.body.body.length; i >= 0; i--) {
const statement = node.body.body[i];
const body = block.get("body");

for (let i = body.length - 1; i >= 0; i--) {
const statement = body[i];
if (
t.isIfStatement(statement) &&
!statement.alternate &&
t.isReturnStatement(statement.consequent) &&
!statement.consequent.argument
t.isIfStatement(statement.node) &&
!statement.node.alternate &&
t.isReturnStatement(statement.node.consequent) &&
!statement.node.consequent.argument
) {
genericEarlyExitTransform(path.get("body").get("body")[i]);
genericEarlyExitTransform(statement);
}
}
}

function earlyContinueTransform(path) {
const { node } = path;
const block = path.get("body");

if (!t.isBlockStatement(node.body)) {
if (!block.isBlockStatement()) {
return;
}

for (let i = node.body.body.length; i >= 0; i--) {
const statement = node.body.body[i];
let body = block.get("body");

for (let i = body.length - 1; i >= 0; i--) {
const statement = body[i];
if (
t.isIfStatement(statement) &&
!statement.alternate &&
t.isContinueStatement(statement.consequent) &&
!statement.consequent.label
t.isIfStatement(statement.node) &&
!statement.node.alternate &&
t.isContinueStatement(statement.node.consequent) &&
!statement.node.consequent.label
) {
genericEarlyExitTransform(path.get("body").get("body")[i]);
genericEarlyExitTransform(statement);
}
}

// because we might have folded or removed statements
body = block.get("body");

// We may have reduced the body to a single statement.
if (node.body.body.length === 1 && !needsBlock(node.body, node)) {
path.get("body").replaceWith(node.body.body[0]);
if (body.length === 1 && !needsBlock(block.node, path.node)) {
block.replaceWith(body[0].node);
}
}

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