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std/fmt: add fmtDurationSigned

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When working with durations it often makes sense to use signed integers
and allow negative durations, and there is currently no nice way to
format these in std.fmt. This patch adds a simple wrapper for the
existing fmtDurtion to fit this need.
This commit is contained in:
Isaac Freund 2021-06-26 15:21:27 +02:00 committed by Veikka Tuominen
parent ef56e42a2a
commit f398ac3ee4
1 changed files with 81 additions and 0 deletions
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81
lib/std/fmt.zig
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@ -1461,6 +1461,87 @@ test "fmtDuration" {
}
}
fn formatDurationSigned(ns: i64, comptime fmt: []const u8, options: std.fmt.FormatOptions, writer: anytype) !void {
if (ns < 0) {
try writer.writeByte('-');
try formatDuration(@intCast(u64, -ns), fmt, options, writer);
} else {
try formatDuration(@intCast(u64, ns), fmt, options, writer);
}
}
/// Return a Formatter for number of nanoseconds according to its signed magnitude:
/// [#y][#w][#d][#h][#m]#[.###][n|u|m]s
pub fn fmtDurationSigned(ns: i64) Formatter(formatDurationSigned) {
return .{ .data = ns };
}
test "fmtDurationSigned" {
var buf: [24]u8 = undefined;
inline for (.{
.{ .s = "0ns", .d = 0 },
.{ .s = "1ns", .d = 1 },
.{ .s = "-1ns", .d = -(1) },
.{ .s = "999ns", .d = std.time.ns_per_us - 1 },
.{ .s = "-999ns", .d = -(std.time.ns_per_us - 1) },
.{ .s = "1us", .d = std.time.ns_per_us },
.{ .s = "-1us", .d = -(std.time.ns_per_us) },
.{ .s = "1.45us", .d = 1450 },
.{ .s = "-1.45us", .d = -(1450) },
.{ .s = "1.5us", .d = 3 * std.time.ns_per_us / 2 },
.{ .s = "-1.5us", .d = -(3 * std.time.ns_per_us / 2) },
.{ .s = "14.5us", .d = 14500 },
.{ .s = "-14.5us", .d = -(14500) },
.{ .s = "145us", .d = 145000 },
.{ .s = "-145us", .d = -(145000) },
.{ .s = "999.999us", .d = std.time.ns_per_ms - 1 },
.{ .s = "-999.999us", .d = -(std.time.ns_per_ms - 1) },
.{ .s = "1ms", .d = std.time.ns_per_ms + 1 },
.{ .s = "-1ms", .d = -(std.time.ns_per_ms + 1) },
.{ .s = "1.5ms", .d = 3 * std.time.ns_per_ms / 2 },
.{ .s = "-1.5ms", .d = -(3 * std.time.ns_per_ms / 2) },
.{ .s = "1.11ms", .d = 1110000 },
.{ .s = "-1.11ms", .d = -(1110000) },
.{ .s = "1.111ms", .d = 1111000 },
.{ .s = "-1.111ms", .d = -(1111000) },
.{ .s = "1.111ms", .d = 1111100 },
.{ .s = "-1.111ms", .d = -(1111100) },
.{ .s = "999.999ms", .d = std.time.ns_per_s - 1 },
.{ .s = "-999.999ms", .d = -(std.time.ns_per_s - 1) },
.{ .s = "1s", .d = std.time.ns_per_s },
.{ .s = "-1s", .d = -(std.time.ns_per_s) },
.{ .s = "59.999s", .d = std.time.ns_per_min - 1 },
.{ .s = "-59.999s", .d = -(std.time.ns_per_min - 1) },
.{ .s = "1m", .d = std.time.ns_per_min },
.{ .s = "-1m", .d = -(std.time.ns_per_min) },
.{ .s = "1h", .d = std.time.ns_per_hour },
.{ .s = "-1h", .d = -(std.time.ns_per_hour) },
.{ .s = "1d", .d = std.time.ns_per_day },
.{ .s = "-1d", .d = -(std.time.ns_per_day) },
.{ .s = "1w", .d = std.time.ns_per_week },
.{ .s = "-1w", .d = -(std.time.ns_per_week) },
.{ .s = "1y", .d = 365 * std.time.ns_per_day },
.{ .s = "-1y", .d = -(365 * std.time.ns_per_day) },
.{ .s = "1y52w23h59m59.999s", .d = 730 * std.time.ns_per_day - 1 }, // 365d = 52w1d
.{ .s = "-1y52w23h59m59.999s", .d = -(730 * std.time.ns_per_day - 1) }, // 365d = 52w1d
.{ .s = "1y1h1.001s", .d = 365 * std.time.ns_per_day + std.time.ns_per_hour + std.time.ns_per_s + std.time.ns_per_ms },
.{ .s = "-1y1h1.001s", .d = -(365 * std.time.ns_per_day + std.time.ns_per_hour + std.time.ns_per_s + std.time.ns_per_ms) },
.{ .s = "1y1h1s", .d = 365 * std.time.ns_per_day + std.time.ns_per_hour + std.time.ns_per_s + 999 * std.time.ns_per_us },
.{ .s = "-1y1h1s", .d = -(365 * std.time.ns_per_day + std.time.ns_per_hour + std.time.ns_per_s + 999 * std.time.ns_per_us) },
.{ .s = "1y1h999.999us", .d = 365 * std.time.ns_per_day + std.time.ns_per_hour + std.time.ns_per_ms - 1 },
.{ .s = "-1y1h999.999us", .d = -(365 * std.time.ns_per_day + std.time.ns_per_hour + std.time.ns_per_ms - 1) },
.{ .s = "1y1h1ms", .d = 365 * std.time.ns_per_day + std.time.ns_per_hour + std.time.ns_per_ms },
.{ .s = "-1y1h1ms", .d = -(365 * std.time.ns_per_day + std.time.ns_per_hour + std.time.ns_per_ms) },
.{ .s = "1y1h1ms", .d = 365 * std.time.ns_per_day + std.time.ns_per_hour + std.time.ns_per_ms + 1 },
.{ .s = "-1y1h1ms", .d = -(365 * std.time.ns_per_day + std.time.ns_per_hour + std.time.ns_per_ms + 1) },
.{ .s = "1y1m999ns", .d = 365 * std.time.ns_per_day + std.time.ns_per_min + 999 },
.{ .s = "-1y1m999ns", .d = -(365 * std.time.ns_per_day + std.time.ns_per_min + 999) },
}) |tc| {
const slice = try bufPrint(&buf, "{}", .{fmtDurationSigned(tc.d)});
try std.testing.expectEqualStrings(tc.s, slice);
}
}
pub const ParseIntError = error{
/// The result cannot fit in the type specified
Overflow,