From b3f15a867c79ccb72cf30444b2317735a3f35348 Mon Sep 17 00:00:00 2001
From: Christoffer Lerno <christoffer@aegik.com>
Date: Fri, 10 Feb 2023 08:38:00 +0100
Subject: [PATCH] Added "clear" to VarString

---
 lib/std/core/string.c3     | 15 +++++++++++++++
 test/unit/stdlib/string.c3 | 19 +++++++++++++++++++
 2 files changed, 34 insertions(+)
 create mode 100644 test/unit/stdlib/string.c3

diff --git a/lib/std/core/string.c3 b/lib/std/core/string.c3
index 7ccd96241..67371c2e2 100644
--- a/lib/std/core/string.c3
+++ b/lib/std/core/string.c3
@@ -2,6 +2,10 @@ module std::core::string;
 import libc;
 
 define VarString = distinct void*;
+define DynStr = VarString;
+define DynString = VarString;
+define DString = VarString;
+define VString = VarString;
 
 private struct StringData
 {
@@ -52,6 +56,12 @@ fn ZString VarString.zstr(VarString str)
 	return (ZString)&data.chars[0];
 }
 
+fn usz VarString.capacity(VarString this)
+{
+	if (!this) return 0;
+	return this.data().capacity;
+}
+
 fn usz VarString.len(VarString this)
 {
 	if (!this) return 0;
@@ -245,6 +255,11 @@ fn void VarString.append_string(VarString* this, VarString str)
 	this.append(str.str());
 }
 
+fn void VarString.clear(VarString* str)
+{
+	str.data().len = 0;
+}
+
 fn void VarString.append_char(VarString* str, char c)
 {
 	if (!*str)
diff --git a/test/unit/stdlib/string.c3 b/test/unit/stdlib/string.c3
new file mode 100644
index 000000000..75971c7d0
--- /dev/null
+++ b/test/unit/stdlib/string.c3
@@ -0,0 +1,19 @@
+module string_test;
+
+fn void! test_clear() @test
+{
+	DynString s = string::new_with_capacity(32);
+	assert(s.len() == 0);
+	assert(s.capacity() == 32);
+	s.append_repeat('x', 63);
+	assert(s.capacity() == 64);
+	assert(s.len() == 63);
+	char* addr = &s[0];
+	s.clear();
+	assert(s.capacity() == 64);
+	assert(s.len() == 0);
+	s.append_repeat('x', 63);
+	assert(s.capacity() == 64);
+	assert(s.len() == 63);
+	assert(addr == &s[0]);
+}
\ No newline at end of file