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/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at <http://mozilla.org/MPL/2.0/>. */
import { isFulfilled } from "./async-value";
// Used to detect minification for automatic pretty printing
const SAMPLE_SIZE = 50;
const INDENT_COUNT_THRESHOLD = 5;
const CHARACTER_LIMIT = 250;
const _minifiedCache = new Map();
export function isMinified(source, sourceTextContent) {
if (_minifiedCache.has(source.id)) {
return _minifiedCache.get(source.id);
}
if (
!sourceTextContent ||
!isFulfilled(sourceTextContent) ||
sourceTextContent.value.type !== "text"
) {
return false;
}
let text = sourceTextContent.value.value;
let lineEndIndex = 0;
let lineStartIndex = 0;
let lines = 0;
let indentCount = 0;
let overCharLimit = false;
// Strip comments.
text = text.replace(/\/\*[\S\s]*?\*\/|\/\/(.+|\n)/g, "");
while (lines++ < SAMPLE_SIZE) {
lineEndIndex = text.indexOf("\n", lineStartIndex);
if (lineEndIndex == -1) {
break;
}
if (/^\s+/.test(text.slice(lineStartIndex, lineEndIndex))) {
indentCount++;
}
// For files with no indents but are not minified.
if (lineEndIndex - lineStartIndex > CHARACTER_LIMIT) {
overCharLimit = true;
break;
}
lineStartIndex = lineEndIndex + 1;
}
const minified =
(indentCount / lines) * 100 < INDENT_COUNT_THRESHOLD || overCharLimit;
_minifiedCache.set(source.id, minified);
return minified;
}
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