Put CSSDiff back into gulpfile

Author: tehvgg

CSSDiff.js

@@ -21,7 +21,6 @@ const Readable = require("stream").Readable;
 const createHash = require("crypto").createHash;
 const fs = require("fs");
 const basename = require("path").basename;
-const CSSDiff = require("./CSSDiff").default;
 
 // constants
 const isProduction = () => process.env.NODE_ENV === "production";
@@ -256,3 +255,87 @@ function diffTheme(theme) {
 function getThemeFromPath(filename) {
 	return filename.match(/_(\w+)\.scss/)[1];
 }
+
+class CSSDiff {
+	diff(base, targ, pretty = false) {
+		let diff = this.compare(this.parse(base), this.parse(targ));
+		return this._writeDiff(diff, pretty);
+	}
+
+	parse(s, o = {}) {
+		this._parse(s, /([^\n\r\{\}]+?)\s*\{\s*/g, /\}/g, o);
+		for (let n in o) {
+			if (n === " keys") { continue; }
+			o[n] = this.parseBlock(o[n]);
+		}
+		return o;
+	}
+
+	parseBlock(s, o = {}) {
+		return this._parse(s, /([^\s:]+)\s*:/g, /(?:;|$)/g, o);
+	}
+
+	compare(o0, o1, o = {}) {
+		let keys = o1[" keys"], l=keys.length, arr=[];
+		for (let i=0; i<l; i++) {
+			let n = keys[i];
+			if (!o0[n]) { o[n] = o1[n]; arr.push(n); continue; }
+			let diff = this._compareBlock(o0[n], o1[n]);
+			if (diff) { o[n] = diff; arr.push(n); }
+		}
+		o[" keys"] = arr;
+		return o;
+	}
+
+	_compareBlock(o0, o1) {
+		let keys = o1[" keys"], l=keys.length, arr=[], o;
+		for (let i=0; i<l; i++) {
+			let n = keys[i];
+			if (o0[n] === o1[n]) { continue; }
+			if (!o) { o = {}; }
+			o[n] = o1[n];
+			arr.push(n);
+		}
+		if (o) { o[" keys"] = arr; }
+		return o;
+	}
+
+	_parse(s, keyRE, closeRE, o) {
+		let i, match, arr=[];
+		while (match = keyRE.exec(s)) {
+			let key = match[1];
+			i = closeRE.lastIndex = keyRE.lastIndex;
+			if (!(match = closeRE.exec(s))) { console.log("couldn't find close", key); break; }
+			o[key] = s.substring(i, closeRE.lastIndex-match[0].length).trim();
+			i = keyRE.lastIndex = closeRE.lastIndex;
+			arr.push(key);
+		}
+		o[" keys"] = arr;
+		return o;
+	}
+
+	_writeDiff(o, pretty = false) {
+		let diff = "", ln="\n", s=" ";
+		if (!pretty) { ln = s = ""; }
+		let keys = o[" keys"], l=keys.length;
+		for (let i=0; i<l; i++) {
+			let n = keys[i];
+			if (diff) { diff += ln + ln; }
+			diff += n + s + "{" + ln;
+			diff += this._writeBlock(o[n], pretty);
+			diff += "}";
+		}
+		return diff;
+	}
+
+	_writeBlock(o, pretty = false) {
+		let diff = "", ln="\n", t="\t", s=" ";
+		if (!pretty) { ln = t = s = ""; }
+		let keys = o[" keys"], l=keys.length;
+		for (let i=0; i<l; i++) {
+			let n = keys[i];
+			diff += t + n + ":" + s + o[n] + ";" + ln;
+		}
+		return diff;
+	}
+}