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std: allow specifiying enums to be formatted as numbers

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daurnimator 2020-03-10 23:36:27 +11:00 committed by Andrew Kelley
parent d10e407977
commit 292d515e91
1 changed files with 21 additions and 1 deletions
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22
lib/std/fmt.zig
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@ -359,11 +359,28 @@ pub fn formatType(
},
.Enum => |enumInfo| {
try out_stream.writeAll(@typeName(T));
var has_name: bool = undefined;
if (enumInfo.is_exhaustive) {
has_name = true;
} else {
// TODO: when @tagName works on exhaustive enums print known enum strings
has_name = false;
}
var use_name = has_name;
if (comptime std.mem.eql(u8, fmt, "x") or
comptime std.mem.eql(u8, fmt, "X") or
comptime std.mem.eql(u8, fmt, "d") or
comptime std.mem.eql(u8, fmt, "b"))
{
use_name = false;
}
if (use_name) {
try out_stream.writeAll(".");
try out_stream.writeAll(@tagName(value));
} else {
// TODO: when @tagName works on exhaustive enums print known enum strings
try out_stream.writeAll("(");
try formatType(@enumToInt(value), fmt, options, out_stream, max_depth);
try out_stream.writeAll(")");
@ -1308,6 +1325,8 @@ test "enum" {
const value = Enum.Two;
try testFmt("enum: Enum.Two\n", "enum: {}\n", .{value});
try testFmt("enum: Enum.Two\n", "enum: {}\n", .{&value});
try testFmt("enum: Enum(0)\n", "enum: {x}\n", .{Enum.One});
try testFmt("enum: Enum(1)\n", "enum: {X}\n", .{Enum.Two});
}
test "non-exhaustive enum" {
@ -1321,6 +1340,7 @@ test "non-exhaustive enum" {
try testFmt("enum: Enum(4660)\n", "enum: {}\n", .{@intToEnum(Enum, 0x1234)});
try testFmt("enum: Enum(f)\n", "enum: {x}\n", .{Enum.One});
try testFmt("enum: Enum(beef)\n", "enum: {x}\n", .{Enum.Two});
try testFmt("enum: Enum(BEEF)\n", "enum: {X}\n", .{Enum.Two});
try testFmt("enum: Enum(1234)\n", "enum: {x}\n", .{@intToEnum(Enum, 0x1234)});
}