From 9b47ee5bdaa2bbc0f84442e5467676318c5c1296 Mon Sep 17 00:00:00 2001
From: Vlasta Vesely <vlastavesely@protonmail.ch>
Date: Mon, 16 Jan 2023 19:48:45 +0000
Subject: c.lang: highlight binary numbers

---
 data/language-specs/c.lang       | 19 +++++++++++++++++++
 tests/syntax-highlighting/file.c |  7 +++++++
 2 files changed, 26 insertions(+)

diff --git a/data/language-specs/c.lang b/data/language-specs/c.lang
index 641daf53..8ebb1fc7 100644
--- a/data/language-specs/c.lang
+++ b/data/language-specs/c.lang
@@ -47,6 +47,7 @@
     <style id="escaped-character" name="Escaped Character"     map-to="def:special-char"/>
     <style id="floating-point"    name="Floating point number" map-to="def:floating-point"/>
     <style id="decimal"           name="Decimal number"        map-to="def:decimal"/>
+    <style id="binary"            name="Binary number"         map-to="def:base-n-integer"/>
     <style id="octal"             name="Octal number"          map-to="def:base-n-integer"/>
     <style id="hexadecimal"       name="Hexadecimal number"    map-to="def:base-n-integer"/>
     <style id="boolean"           name="Boolean value"         map-to="def:boolean"/>
@@ -187,6 +188,22 @@
       </match>
     </context>
 
+    <context id="binary" style-ref="binary">
+      <match extended="true">
+        (?&lt;![\w\.])
+        0[bB][01]+[uUlL]*
+        (?![\w\.])
+      </match>
+    </context>
+
+    <context id="invalid-binary" style-ref="error">
+      <match extended="true">
+        (?&lt;![\w\.])
+        0[bB][01]*[2-9][a-zA-Z0-9]*[uUlL]*
+        (?![\w\.])
+      </match>
+    </context>
+
     <context id="decimal" style-ref="decimal">
       <match extended="true">
         (?&lt;![\w\.])
@@ -325,6 +342,8 @@
         <context ref="invalid-hexadecimal"/>
         <context ref="octal"/>
         <context ref="invalid-octal"/>
+        <context ref="binary"/>
+        <context ref="invalid-binary"/>
         <context ref="decimal"/>
         <context ref="keywords"/>
         <context ref="type-keywords"/>
diff --git a/tests/syntax-highlighting/file.c b/tests/syntax-highlighting/file.c
index 74769b74..5ec5c0fe 100644
--- a/tests/syntax-highlighting/file.c
+++ b/tests/syntax-highlighting/file.c
@@ -8,6 +8,13 @@ int main (void)
     int b = 089;
     int c = 89.;
     int d = 'a';
+
+    int a = 0b0101U;
+    int c = 0b0101L;
+    int d = 0B0101L;
+    int b = 0b201u;
+    int b = 0B061u;
+
     double hexadecimal_floating_constant = 0x1.2p3;
     printf ("Hello %s!\n", "world");
     return 0;
-- 
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