From fd432a5b1d3b2ede9f3e4459b830b36c8e9ff019 Mon Sep 17 00:00:00 2001
From: Sam Chen <chenxsan@gmail.com>
Date: Sat, 4 Apr 2020 21:50:48 +0800
Subject: [PATCH] Diff: Added `prefix` token (#2281)

This adds a token to match line prefixes.
---
 components/prism-diff.js               | 14 ++++++++++++--
 components/prism-diff.min.js           |  2 +-
 tests/languages/diff/diff_feature.test | 12 ++++++------
 3 files changed, 19 insertions(+), 9 deletions(-)

diff --git a/components/prism-diff.js b/components/prism-diff.js
index 9dfc0e9153..2d824f7b76 100644
--- a/components/prism-diff.js
+++ b/components/prism-diff.js
@@ -40,10 +40,20 @@
 		}
 
 		Prism.languages.diff[name] = {
-			// pattern: /^(?:[_].*(?:\r\n?|\n|(?![\s\S])))+/m
 			pattern: RegExp('^(?:[' + prefix + '].*(?:\r\n?|\n|(?![\\s\\S])))+', 'm'),
-			alias: alias
+			alias: alias,
+			inside: {
+				'line': {
+					pattern: /(.)(?=[\s\S]).*(?:\r\n?|\n)?/,
+					lookbehind: true
+				},
+				'prefix': {
+					pattern: /[\s\S]/,
+					alias: /\w+/.exec(name)[0]
+				}
+			}
 		};
+		
 	});
 
 	// make prefixes available to Diff plugin
diff --git a/components/prism-diff.min.js b/components/prism-diff.min.js
index 708a5a1dbc..18896474fd 100644
--- a/components/prism-diff.min.js
+++ b/components/prism-diff.min.js
@@ -1 +1 @@
-!function(d){d.languages.diff={coord:[/^(?:\*{3}|-{3}|\+{3}).*$/m,/^@@.*@@$/m,/^\d+.*$/m]};var r={"deleted-sign":"-","deleted-arrow":"<","inserted-sign":"+","inserted-arrow":">",unchanged:" ",diff:"!"};Object.keys(r).forEach(function(e){var n=r[e],a=[];/^\w+$/.test(e)||a.push(/\w+/.exec(e)[0]),"diff"===e&&a.push("bold"),d.languages.diff[e]={pattern:RegExp("^(?:["+n+"].*(?:\r\n?|\n|(?![\\s\\S])))+","m"),alias:a}}),Object.defineProperty(d.languages.diff,"PREFIXES",{value:r})}(Prism);
\ No newline at end of file
+!function(i){i.languages.diff={coord:[/^(?:\*{3}|-{3}|\+{3}).*$/m,/^@@.*@@$/m,/^\d+.*$/m]};var r={"deleted-sign":"-","deleted-arrow":"<","inserted-sign":"+","inserted-arrow":">",unchanged:" ",diff:"!"};Object.keys(r).forEach(function(e){var n=r[e],a=[];/^\w+$/.test(e)||a.push(/\w+/.exec(e)[0]),"diff"===e&&a.push("bold"),i.languages.diff[e]={pattern:RegExp("^(?:["+n+"].*(?:\r\n?|\n|(?![\\s\\S])))+","m"),alias:a,inside:{line:{pattern:/(.)(?=[\s\S]).*(?:\r\n?|\n)?/,lookbehind:!0},prefix:{pattern:/[\s\S]/,alias:/\w+/.exec(e)[0]}}}}),Object.defineProperty(i.languages.diff,"PREFIXES",{value:r})}(Prism);
\ No newline at end of file
diff --git a/tests/languages/diff/diff_feature.test b/tests/languages/diff/diff_feature.test
index 4379e56d44..2dbba25c82 100644
--- a/tests/languages/diff/diff_feature.test
+++ b/tests/languages/diff/diff_feature.test
@@ -11,12 +11,12 @@
 ----------------------------------------------------
 
 [
-	["diff", "!     qt: core\r\n"],
-	["unchanged", "  unchanged\r\n"],
-	["deleted-sign", "-    qt: core\r\n"],
-	["inserted-sign", "+    qt: core gui\r\n"],
-	["deleted-arrow", "< qt: core\r\n"],
-	["inserted-arrow", "> qt: core quick"]
+	["diff", [["prefix", "!"], ["line", "     qt: core\r\n"]]],
+	["unchanged", [["prefix", " "], ["line", " unchanged\r\n"]]],
+	["deleted-sign", [["prefix", "-"], ["line", "    qt: core\r\n"]]],
+	["inserted-sign", [["prefix", "+"], ["line", "    qt: core gui\r\n"]]],
+	["deleted-arrow", [["prefix", "<"], ["line", " qt: core\r\n"]]],
+	["inserted-arrow", [["prefix", ">"], ["line", " qt: core quick"]]]
 ]
 
 ----------------------------------------------------