117 lines
2.6 KiB
JavaScript
117 lines
2.6 KiB
JavaScript
module.exports = Node;
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var whitespace = require("./whitespace");
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var parens = require("./parentheses");
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var t = require("../../types");
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var _ = require("lodash");
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var find = function (obj, node, parent) {
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if (!obj) return;
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var result;
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var types = Object.keys(obj);
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for (var i = 0; i < types.length; i++) {
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var type = types[i];
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if (t["is" + type](node)) {
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var fn = obj[type];
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result = fn(node, parent);
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if (result != null) break;
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}
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}
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return result;
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};
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function Node(node, parent) {
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this.parent = parent;
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this.node = node;
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}
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Node.prototype.isUserWhitespacable = function () {
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return t.isUserWhitespacable(this.node);
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};
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Node.prototype.needsWhitespace = function (type) {
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var parent = this.parent;
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var node = this.node;
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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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var lines = find(whitespace[type].nodes, node, parent);
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if (lines) return lines;
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_.each(find(whitespace[type].list, node, parent), function (expr) {
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lines = Node.needsWhitespace(expr, node, type);
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if (lines) return false;
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});
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return lines || 0;
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};
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Node.prototype.needsWhitespaceBefore = function () {
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return this.needsWhitespace("before");
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};
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Node.prototype.needsWhitespaceAfter = function () {
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return this.needsWhitespace("after");
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};
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Node.prototype.needsParens = function () {
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var parent = this.parent;
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var node = this.node;
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if (!parent) return false;
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if (t.isNewExpression(parent) && parent.callee === node) {
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if (t.isCallExpression(node)) return true;
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var hasCall = _.some(node, function (val) {
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return t.isCallExpression(val);
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});
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if (hasCall) return true;
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}
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return find(parens, node, parent);
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};
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Node.prototype.needsParensNoLineTerminator = function () {
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var parent = this.parent;
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var node = this.node;
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if (!parent) return false;
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// no comments
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if (!node.leadingComments || !node.leadingComments.length) {
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return false;
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}
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if (t.isYieldExpression(parent) || t.isAwaitExpression(parent)) {
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return true;
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}
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if (t.isContinueStatement(parent) || t.isBreakStatement(parent) ||
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t.isReturnStatement(parent) || t.isThrowStatement(parent)) {
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return true;
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}
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return false;
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};
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_.each(Node.prototype, function (fn, key) {
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Node[key] = function (node, parent) {
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var n = new Node(node, parent);
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// Avoid leaking arguments to prevent deoptimization
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var skipCount = 2;
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var args = new Array(arguments.length - skipCount);
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for (var i = 0; i < args.length; i++) {
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args[i] = arguments[i + 2];
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}
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return n[key].apply(n, args);
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};
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});
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