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const formatter = @This();
const std = @import("std");
const Allocator = std.mem.Allocator;
const Key = @import("key.zig").Key;
/// Returns a single entry formatter for the given field name and writer.
pub fn entryFormatter(
name: []const u8,
writer: *std.Io.Writer,
) EntryFormatter {
return .{ .name = name, .writer = writer };
}
/// The entry formatter type for a given writer.
pub const EntryFormatter = struct {
name: []const u8,
writer: *std.Io.Writer,
pub fn formatEntry(
self: @This(),
comptime T: type,
value: T,
) !void {
return formatter.formatEntry(
T,
self.name,
value,
self.writer,
);
}
};
/// Format a single type with the given name and value.
pub fn formatEntry(
comptime T: type,
name: []const u8,
value: T,
writer: *std.Io.Writer,
) !void {
switch (@typeInfo(T)) {
.bool, .int => {
try writer.print("{s} = {}\n", .{ name, value });
return;
},
.float => {
try writer.print("{s} = {d}\n", .{ name, value });
return;
},
.@"enum" => {
try writer.print("{s} = {t}\n", .{ name, value });
return;
},
.void => {
try writer.print("{s} = \n", .{name});
return;
},
.optional => |info| {
if (value) |inner| {
try formatEntry(
info.child,
name,
inner,
writer,
);
} else {
try writer.print("{s} = \n", .{name});
}
return;
},
.pointer => switch (T) {
[]const u8,
[:0]const u8,
=> {
try writer.print("{s} = {s}\n", .{ name, value });
return;
},
else => {},
},
// Structs of all types require a "formatEntry" function
// to be defined which will be called to format the value.
// This is given the formatter in use so that they can
// call BACK to our formatEntry to write each primitive
// value.
.@"struct" => |info| if (@hasDecl(T, "formatEntry")) {
try value.formatEntry(entryFormatter(name, writer));
return;
} else switch (info.layout) {
// Packed structs we special case.
.@"packed" => {
try writer.print("{s} = ", .{name});
inline for (info.fields, 0..) |field, i| {
if (i > 0) try writer.print(",", .{});
try writer.print("{s}{s}", .{
if (!@field(value, field.name)) "no-" else "",
field.name,
});
}
try writer.print("\n", .{});
return;
},
else => {},
},
.@"union" => if (@hasDecl(T, "formatEntry")) {
try value.formatEntry(entryFormatter(name, writer));
return;
},
else => {},
}
// Compile error so that we can catch missing cases.
@compileLog(T);
@compileError("missing case for type");
}
test "formatEntry bool" {
const testing = std.testing;
{
var buf: std.Io.Writer.Allocating = .init(testing.allocator);
defer buf.deinit();
try formatEntry(bool, "a", true, &buf.writer);
try testing.expectEqualStrings("a = true\n", buf.written());
}
{
var buf: std.Io.Writer.Allocating = .init(testing.allocator);
defer buf.deinit();
try formatEntry(bool, "a", false, &buf.writer);
try testing.expectEqualStrings("a = false\n", buf.written());
}
}
test "formatEntry int" {
const testing = std.testing;
{
var buf: std.Io.Writer.Allocating = .init(testing.allocator);
defer buf.deinit();
try formatEntry(u8, "a", 123, &buf.writer);
try testing.expectEqualStrings("a = 123\n", buf.written());
}
}
test "formatEntry float" {
const testing = std.testing;
{
var buf: std.Io.Writer.Allocating = .init(testing.allocator);
defer buf.deinit();
try formatEntry(f64, "a", 0.7, &buf.writer);
try testing.expectEqualStrings("a = 0.7\n", buf.written());
}
}
test "formatEntry enum" {
const testing = std.testing;
const Enum = enum { one, two, three };
{
var buf: std.Io.Writer.Allocating = .init(testing.allocator);
defer buf.deinit();
try formatEntry(Enum, "a", .two, &buf.writer);
try testing.expectEqualStrings("a = two\n", buf.written());
}
}
test "formatEntry void" {
const testing = std.testing;
{
var buf: std.Io.Writer.Allocating = .init(testing.allocator);
defer buf.deinit();
try formatEntry(void, "a", {}, &buf.writer);
try testing.expectEqualStrings("a = \n", buf.written());
}
}
test "formatEntry optional" {
const testing = std.testing;
{
var buf: std.Io.Writer.Allocating = .init(testing.allocator);
defer buf.deinit();
try formatEntry(?bool, "a", null, &buf.writer);
try testing.expectEqualStrings("a = \n", buf.written());
}
{
var buf: std.Io.Writer.Allocating = .init(testing.allocator);
defer buf.deinit();
try formatEntry(?bool, "a", false, &buf.writer);
try testing.expectEqualStrings("a = false\n", buf.written());
}
}
test "formatEntry string" {
const testing = std.testing;
{
var buf: std.Io.Writer.Allocating = .init(testing.allocator);
defer buf.deinit();
try formatEntry([]const u8, "a", "hello", &buf.writer);
try testing.expectEqualStrings("a = hello\n", buf.written());
}
}
test "formatEntry packed struct" {
const testing = std.testing;
const Value = packed struct {
one: bool = true,
two: bool = false,
};
{
var buf: std.Io.Writer.Allocating = .init(testing.allocator);
defer buf.deinit();
try formatEntry(Value, "a", .{}, &buf.writer);
try testing.expectEqualStrings("a = one,no-two\n", buf.written());
}
}
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