From f6673c8460336e63bec229ea005056791016560c Mon Sep 17 00:00:00 2001
From: Bogdan Chadkin <trysound@yandex.ru>
Date: Mon, 29 May 2017 17:49:43 +0300
Subject: [PATCH] fix: preserve leading underscore in class names (#543)

---
 lib/processCss.js | 28 +++++++++++-----------------
 package.json      |  1 +
 test/localTest.js |  5 +++++
 yarn.lock         | 18 ++++++++++++++----
 4 files changed, 31 insertions(+), 21 deletions(-)

diff --git a/lib/processCss.js b/lib/processCss.js
index 04dcdb1d..8c688e34 100644
--- a/lib/processCss.js
+++ b/lib/processCss.js
@@ -9,6 +9,7 @@ var loaderUtils = require("loader-utils");
 var assign = require("object-assign");
 var getLocalIdent = require("./getLocalIdent");
 
+var icssUtils = require('icss-utils');
 var localByDefault = require("postcss-modules-local-by-default");
 var extractImports = require("postcss-modules-extract-imports");
 var modulesScope = require("postcss-modules-scope");
@@ -65,24 +66,17 @@ var parserPlugin = postcss.plugin("css-loader-parser", function(options) {
 			});
 		}
 
-		css.walkRules(function(rule) {
-			if(rule.selector === ":export") {
-				rule.walkDecls(function(decl) {
-					exports[decl.prop] = decl.value;
-				});
-				rule.remove();
-			} else if(/^:import\(.+\)$/.test(rule.selector)) {
-				var match = /^:import\((.+)\)$/.exec(rule.selector);
-				var url = loaderUtils.parseString(match[1]);
-				rule.walkDecls(function(decl) {
-					imports["$" + decl.prop] = importItems.length;
-					importItems.push({
-						url: url,
-						export: decl.value
-					});
+		var icss = icssUtils.extractICSS(css);
+		exports = icss.icssExports;
+		Object.keys(icss.icssImports).forEach(function(key) {
+			var url = loaderUtils.parseString(key);
+			Object.keys(icss.icssImports[key]).forEach(function(prop) {
+				imports["$" + prop] = importItems.length;
+				importItems.push({
+					url: url,
+					export: icss.icssImports[key][prop]
 				});
-				rule.remove();
-			}
+			})
 		});
 
 		Object.keys(exports).forEach(function(exportName) {
diff --git a/package.json b/package.json
index 2d17a16d..b13646b8 100644
--- a/package.json
+++ b/package.json
@@ -15,6 +15,7 @@
     "babel-code-frame": "^6.11.0",
     "css-selector-tokenizer": "^0.7.0",
     "cssnano": ">=2.6.1 <4",
+    "icss-utils": "^2.1.0",
     "loader-utils": "^1.0.2",
     "lodash.camelcase": "^4.3.0",
     "object-assign": "^4.0.1",
diff --git a/test/localTest.js b/test/localTest.js
index e2146bdf..81c55434 100644
--- a/test/localTest.js
+++ b/test/localTest.js
@@ -217,4 +217,9 @@ describe("local", function() {
 	], {
 		test: "_--test"
 	}, "?localIdentName=--[local]");
+	testLocal("saves underscore prefix in exported class names", ":export { _test: _test }", [
+		[1, "", ""]
+	], {
+		_test: '_test'
+	}, "?localIdentName=[local]");
 });
diff --git a/yarn.lock b/yarn.lock
index 32bd1f0b..b5ab0cdc 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -520,10 +520,6 @@ conventional-recommended-bump@^0.3.0:
     meow "^3.3.0"
     object-assign "^4.0.1"
 
-convert-source-map@^1.3.0:
-  version "1.4.0"
-  resolved "https://registry.yarnpkg.com/convert-source-map/-/convert-source-map-1.4.0.tgz#e3dad195bf61bfe13a7a3c73e9876ec14a0268f3"
-
 core-util-is@~1.0.0:
   version "1.0.2"
   resolved "https://registry.yarnpkg.com/core-util-is/-/core-util-is-1.0.2.tgz#b5fd54220aa2bc5ab57aab7140c940754503c1a7"
@@ -1164,6 +1160,12 @@ icss-replace-symbols@^1.0.2:
   version "1.0.2"
   resolved "https://registry.yarnpkg.com/icss-replace-symbols/-/icss-replace-symbols-1.0.2.tgz#cb0b6054eb3af6edc9ab1d62d01933e2d4c8bfa5"
 
+icss-utils@^2.1.0:
+  version "2.1.0"
+  resolved "https://registry.yarnpkg.com/icss-utils/-/icss-utils-2.1.0.tgz#83f0a0ec378bf3246178b6c2ad9136f135b1c962"
+  dependencies:
+    postcss "^6.0.1"
+
 ignore@^3.2.0:
   version "3.2.4"
   resolved "https://registry.yarnpkg.com/ignore/-/ignore-3.2.4.tgz#4055e03596729a8fabe45a43c100ad5ed815c4e8"
@@ -2036,6 +2038,14 @@ postcss@^5.0.10, postcss@^5.0.11, postcss@^5.0.12, postcss@^5.0.13, postcss@^5.0
     source-map "^0.5.6"
     supports-color "^3.2.3"
 
+postcss@^6.0.1:
+  version "6.0.1"
+  resolved "https://registry.yarnpkg.com/postcss/-/postcss-6.0.1.tgz#000dbd1f8eef217aa368b9a212c5fc40b2a8f3f2"
+  dependencies:
+    chalk "^1.1.3"
+    source-map "^0.5.6"
+    supports-color "^3.2.3"
+
 prelude-ls@~1.1.2:
   version "1.1.2"
   resolved "https://registry.yarnpkg.com/prelude-ls/-/prelude-ls-1.1.2.tgz#21932a549f5e52ffd9a827f570e04be62a97da54"