95 lines
2.3 KiB
JavaScript
95 lines
2.3 KiB
JavaScript
import whitespace from "./whitespace";
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import * as parens from "./parentheses";
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import * as t from "babel-types";
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function expandAliases(obj) {
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let newObj = {};
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function add(type, func) {
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let fn = newObj[type];
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newObj[type] = fn ? function(node, parent, stack) {
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let result = fn(node, parent, stack);
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return result == null ? func(node, parent, stack) : result;
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} : func;
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}
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for (let type of Object.keys(obj)) {
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let aliases = t.FLIPPED_ALIAS_KEYS[type];
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if (aliases) {
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for (let alias of aliases) {
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add(alias, obj[type]);
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}
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} else {
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add(type, obj[type]);
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}
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}
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return newObj;
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}
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// Rather than using `t.is` on each object property, we pre-expand any type aliases
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// into concrete types so that the 'find' call below can be as fast as possible.
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let expandedParens = expandAliases(parens);
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let expandedWhitespaceNodes = expandAliases(whitespace.nodes);
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let expandedWhitespaceList = expandAliases(whitespace.list);
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function find(obj, node, parent, printStack) {
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let fn = obj[node.type];
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return fn ? fn(node, parent, printStack) : null;
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}
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function isOrHasCallExpression(node) {
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if (t.isCallExpression(node)) {
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return true;
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}
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if (t.isMemberExpression(node)) {
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return isOrHasCallExpression(node.object) ||
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(!node.computed && isOrHasCallExpression(node.property));
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} else {
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return false;
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}
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}
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export function needsWhitespace(node, parent, type) {
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if (!node) return 0;
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if (t.isExpressionStatement(node)) {
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node = node.expression;
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}
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let linesInfo = find(expandedWhitespaceNodes, node, parent);
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if (!linesInfo) {
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let items = find(expandedWhitespaceList, node, parent);
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if (items) {
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for (let i = 0; i < items.length; i++) {
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linesInfo = needsWhitespace(items[i], node, type);
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if (linesInfo) break;
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}
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}
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}
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return (linesInfo && linesInfo[type]) || 0;
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}
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export function needsWhitespaceBefore(node, parent) {
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return needsWhitespace(node, parent, "before");
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}
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export function needsWhitespaceAfter(node, parent) {
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return needsWhitespace(node, parent, "after");
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}
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export function needsParens(node, parent, printStack) {
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if (!parent) return false;
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if (t.isNewExpression(parent) && parent.callee === node) {
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if (isOrHasCallExpression(node)) return true;
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}
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return find(expandedParens, node, parent, printStack);
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}
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