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std.fmt can print nullables, errors, and error unions

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Andrew Kelley 2017-05-23 18:38:41 -04:00
parent d8d45908fa
commit 0065eb7c80
1 changed files with 46 additions and 0 deletions
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46
std/fmt.zig
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@ -188,6 +188,25 @@ pub fn formatValue(value: var, context: var, output: fn(@typeOf(context), []cons
builtin.TypeId.Bool => {
return output(context, if (value) "true" else "false");
},
builtin.TypeId.Nullable => {
if (value) |payload| {
return formatValue(payload, context, output);
} else {
return output(context, "null");
}
},
builtin.TypeId.ErrorUnion => {
if (value) |payload| {
return formatValue(payload, context, output);
} else |err| {
return formatValue(err, context, output);
}
},
builtin.TypeId.Error => {
if (!output(context, "error."))
return false;
return output(context, @errorName(value));
},
else => if (@canImplicitCast([]const u8, value)) {
const casted_value = ([]const u8)(value);
return output(context, casted_value);
@ -407,3 +426,30 @@ test "parse unsigned comptime" {
assert(%%parseUnsigned(usize, "2", 10) == 2);
}
}
test "fmt.format" {
{
var buf1: [32]u8 = undefined;
const value: ?i32 = 1234;
const result = bufPrint(buf1[0..], "nullable: {}\n", value);
assert(mem.eql(u8, result, "nullable: 1234\n"));
}
{
var buf1: [32]u8 = undefined;
const value: ?i32 = null;
const result = bufPrint(buf1[0..], "nullable: {}\n", value);
assert(mem.eql(u8, result, "nullable: null\n"));
}
{
var buf1: [32]u8 = undefined;
const value: %i32 = 1234;
const result = bufPrint(buf1[0..], "error union: {}\n", value);
assert(mem.eql(u8, result, "error union: 1234\n"));
}
{
var buf1: [32]u8 = undefined;
const value: %i32 = error.InvalidChar;
const result = bufPrint(buf1[0..], "error union: {}\n", value);
assert(mem.eql(u8, result, "error union: error.InvalidChar\n"));
}
}