101 lines
3.2 KiB
Zig
101 lines
3.2 KiB
Zig
const std = @import("std");
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const fmt = std.fmt;
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const testing = std.testing;
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pub const default = .{
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.string = string,
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.str = string,
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.u8 = int(u8, 0),
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.u16 = int(u16, 0),
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.u32 = int(u32, 0),
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.u64 = int(u64, 0),
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.usize = int(usize, 0),
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.i8 = int(i8, 0),
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.i16 = int(i16, 0),
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.i32 = int(i32, 0),
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.i64 = int(i64, 0),
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.isize = int(isize, 0),
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.f32 = float(f32),
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.f64 = float(f64),
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};
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/// A parser that does nothing.
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pub fn string(in: []const u8) error{}![]const u8 {
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return in;
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}
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test "string" {
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try testing.expectEqualStrings("aa", try string("aa"));
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}
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/// A parser that uses `std.fmt.parseInt` to parse the string into an integer value.
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/// See `std.fmt.parseInt` documentation for more information.
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pub fn int(comptime T: type, comptime base: u8) fn ([]const u8) fmt.ParseIntError!T {
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return struct {
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fn parse(in: []const u8) fmt.ParseIntError!T {
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return fmt.parseInt(T, in, base);
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}
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}.parse;
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}
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test "int" {
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try testing.expectEqual(@as(u8, 0), try int(u8, 10)("0"));
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try testing.expectEqual(@as(u8, 1), try int(u8, 10)("1"));
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try testing.expectEqual(@as(u8, 10), try int(u8, 10)("10"));
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try testing.expectEqual(@as(u8, 0b10), try int(u8, 2)("10"));
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try testing.expectEqual(@as(u8, 0x10), try int(u8, 0)("0x10"));
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try testing.expectEqual(@as(u8, 0b10), try int(u8, 0)("0b10"));
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try testing.expectEqual(@as(u16, 0), try int(u16, 10)("0"));
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try testing.expectEqual(@as(u16, 1), try int(u16, 10)("1"));
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try testing.expectEqual(@as(u16, 10), try int(u16, 10)("10"));
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try testing.expectEqual(@as(u16, 0b10), try int(u16, 2)("10"));
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try testing.expectEqual(@as(u16, 0x10), try int(u16, 0)("0x10"));
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try testing.expectEqual(@as(u16, 0b10), try int(u16, 0)("0b10"));
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}
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/// A parser that uses `std.fmt.parseFloat` to parse the string into an float value.
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/// See `std.fmt.parseFloat` documentation for more information.
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pub fn float(comptime T: type) fn ([]const u8) fmt.ParseFloatError!T {
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return struct {
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fn parse(in: []const u8) fmt.ParseFloatError!T {
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return fmt.parseFloat(T, in);
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}
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}.parse;
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}
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test "float" {
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try testing.expectEqual(@as(f32, 0), try float(f32)("0"));
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}
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pub const EnumError = error{
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NameNotPartOfEnum,
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};
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/// A parser that uses `std.meta.stringToEnum` to parse the string into an enum value. On `null`,
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/// this function returns the error `NameNotPartOfEnum`.
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/// See `std.meta.stringToEnum` documentation for more information.
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pub fn enumeration(comptime T: type) fn ([]const u8) EnumError!T {
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return struct {
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fn parse(in: []const u8) EnumError!T {
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return std.meta.stringToEnum(T, in) orelse error.NameNotPartOfEnum;
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}
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}.parse;
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}
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test "enumeration" {
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const E = enum { a, b, c };
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try testing.expectEqual(E.a, try enumeration(E)("a"));
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try testing.expectEqual(E.b, try enumeration(E)("b"));
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try testing.expectEqual(E.c, try enumeration(E)("c"));
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try testing.expectError(EnumError.NameNotPartOfEnum, enumeration(E)("d"));
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}
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fn ReturnType(comptime P: type) type {
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return @typeInfo(P).Fn.return_type.?;
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}
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pub fn Result(comptime P: type) type {
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return @typeInfo(ReturnType(P)).ErrorUnion.payload;
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}
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