From e6de3d1f1ae715f32a3b2b62f3129c88ba699e63 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Carlos=20Henrique=20Guard=C3=A3o=20Gandarez?=
 <782854+gandarez@users.noreply.github.com>
Date: Thu, 17 Aug 2023 23:54:52 -0300
Subject: [PATCH] Add CPP lexer (#813)

---
 lexers/cpp.go | 36 ++++++++++++++++++++++++++++++++++++
 1 file changed, 36 insertions(+)
 create mode 100644 lexers/cpp.go

diff --git a/lexers/cpp.go b/lexers/cpp.go
new file mode 100644
index 000000000..e3c289640
--- /dev/null
+++ b/lexers/cpp.go
@@ -0,0 +1,36 @@
+package lexers
+
+import (
+	"regexp"
+
+	. "github.com/alecthomas/chroma/v2" // nolint
+)
+
+var (
+	cppAnalyserIncludeRe   = regexp.MustCompile(`#include <[a-z_]+>`)
+	cppAnalyserNamespaceRe = regexp.MustCompile(`using namespace `)
+)
+
+var CPP = Register(MustNewXMLLexer(
+	embedded,
+	"embedded/c++.xml",
+).SetConfig(
+	&Config{
+		Name:      "C++",
+		Aliases:   []string{"cpp", "c++"},
+		Filenames: []string{"*.cpp", "*.hpp", "*.c++", "*.h++", "*.cc", "*.hh", "*.cxx", "*.hxx", "*.C", "*.H", "*.cp", "*.CPP", "*.cppm", "*.ixx"},
+		MimeTypes: []string{"text/x-c++hdr", "text/x-c++src"},
+		Priority:  0.1,
+		EnsureNL:  true,
+	},
+)).SetAnalyser(func(text string) float32 {
+	if cppAnalyserIncludeRe.MatchString(text) {
+		return 0.2
+	}
+
+	if cppAnalyserNamespaceRe.MatchString(text) {
+		return 0.4
+	}
+
+	return 0
+})