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faster output of comments (#2806)

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This commit is contained in:
Alex Lam S.L
2018-01-18 02:57:33 +08:00
committed by GitHub
parent 07e4b64f3a
commit cc07f3b806
1 changed files with 7 additions and 2 deletions
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9
lib/output.js
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@@ -451,6 +451,11 @@ function OutputStream(options) {
return OUTPUT;
};
function has_nlb() {
var index = OUTPUT.lastIndexOf("\n");
return /^ *$/.test(OUTPUT.slice(index + 1));
}
function prepend_comments(node) {
var self = this;
var start = node.start;
@@ -499,7 +504,7 @@ function OutputStream(options) {
comments = comments.filter(comment_filter, node);
if (comments.length == 0) return;
var last_nlb = /(^|\n) *$/.test(OUTPUT);
var last_nlb = has_nlb();
comments.forEach(function(c, i) {
if (!last_nlb) {
if (c.nlb) {
@@ -546,7 +551,7 @@ function OutputStream(options) {
print("\n");
indent();
need_newline_indented = false;
} else if (c.nlb && (i > 0 || !/(^|\n) *$/.test(OUTPUT))) {
} else if (c.nlb && (i > 0 || !has_nlb())) {
print("\n");
indent();
} else if (i > 0 || !tail) {