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add precedence to generated node generation

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This commit is contained in:
Sebastian McKenzie 2014-11-08 12:00:26 +11:00
parent d0a33ab933
commit 4cb90cb1e0
1 changed files with 27 additions and 2 deletions
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29
lib/6to5/generation/node.js
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@ -8,6 +8,8 @@ function Node(node, parent) {
this.node = node; this.node = node;
} }
//
Node.whitespace = { Node.whitespace = {
FunctionExpression: 1, FunctionExpression: 1,
FunctionStatement: 1, FunctionStatement: 1,
@ -27,6 +29,29 @@ _.each(Node.whitespace, function (amounts, type) {
Node.whitespace[type] = amounts; Node.whitespace[type] = amounts;
}); });
//
Node.PRECEDENCE = {};
_.each([
["||"],
["&&"],
["|"],
["^"],
["&"],
["==", "===", "!=", "!=="],
["<", ">", "<=", ">=", "in", "instanceof"],
[">>", "<<", ">>>"],
["+", "-"],
["*", "/", "%"]
], function (tier, i) {
_.each(tier, function (op) {
Node.PRECEDENCE[op] = i;
});
});
//
Node.prototype.needsWhitespace = function (type) { Node.prototype.needsWhitespace = function (type) {
var node = this.node; var node = this.node;
if (!node) return 0; if (!node) return 0;
@ -109,10 +134,10 @@ Node.prototype.needsParans = function () {
if (t.isBinary(parent)) { if (t.isBinary(parent)) {
var parentOp = parent.operator; var parentOp = parent.operator;
var parentPos = t.PRECEDENCE[parentOp]; var parentPos = Node.PRECEDENCE[parentOp];
var nodeOp = node.operator; var nodeOp = node.operator;
var nodePos = t.PRECEDENCE[nodeOp]; var nodePos = Node.PRECEDENCE[nodeOp];
if (parentPos > nodePos) { if (parentPos > nodePos) {
return true; return true;