From f6cd02be6551f3ca702b76b7ca2ab7567effe680 Mon Sep 17 00:00:00 2001
From: daurnimator <quae@daurnimator.com>
Date: Mon, 26 Nov 2018 02:08:12 +1100
Subject: [PATCH] add std.meta.stringToEnum

---
 std/meta/index.zig | 19 +++++++++++++++++++
 1 file changed, 19 insertions(+)

diff --git a/std/meta/index.zig b/std/meta/index.zig
index 2019543b54..69a3097288 100644
--- a/std/meta/index.zig
+++ b/std/meta/index.zig
@@ -76,6 +76,25 @@ test "std.meta.tagName" {
     debug.assert(mem.eql(u8, tagName(u2b), "D"));
 }
 
+pub fn stringToEnum(comptime T: type, str: []const u8) ?T {
+    inline for (@typeInfo(T).Enum.fields) |enumField| {
+        if (std.mem.eql(u8, str, enumField.name)) {
+            return @field(T, enumField.name);
+        }
+    }
+    return null;
+}
+
+test "std.meta.stringToEnum" {
+    const E1 = enum {
+        A,
+        B,
+    };
+    debug.assert(E1.A == stringToEnum(E1, "A").?);
+    debug.assert(E1.B == stringToEnum(E1, "B").?);
+    debug.assert(null == stringToEnum(E1, "C"));
+}
+
 pub fn bitCount(comptime T: type) u32 {
     return switch (@typeInfo(T)) {
         TypeId.Int => |info| info.bits,