73 lines
3.1 KiB
Zig
73 lines
3.1 KiB
Zig
pub const std = @import("std");
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pub fn Union(comptime T: type) type {
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return struct {
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const Self = @This();
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value: T,
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pub fn jsonParse(allocator: std.mem.Allocator, source: anytype, options: std.json.ParseOptions) !Self {
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return jsonParseFromValue(
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allocator,
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try std.json.innerParse(
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std.json.Value,
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allocator,
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source,
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options,
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),
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options,
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);
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}
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pub fn jsonParseFromValue(allocator: std.mem.Allocator, source: std.json.Value, options: std.json.ParseOptions) !Self {
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inline for (std.meta.fields(T)) |field| {
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switch (field.type) {
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bool => if (source == .bool) return .{ .value = @unionInit(T, field.name, source.bool) },
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[]const u8 => switch (source) {
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.string => |v| return .{ .value = @unionInit(T, field.name, v) },
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.number_string => |v| return .{ .value = @unionInit(T, field.name, v) },
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else => {},
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},
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else => switch (@typeInfo(field.type)) {
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.Int => if (source == .integer) return .{ .value = @unionInit(T, field.name, @intCast(source.integer)) },
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.Float => if (source == .float) return .{ .value = @unionInit(T, field.name, @floatCast(source.float)) },
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.Struct => if (source == .object) return .{ .value = @unionInit(T, field.name, try std.json.innerParseFromValue(field.type, allocator, source.object, options)) },
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inline else => switch (source) {
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.number_string, .array => return .{ .value = @unionInit(T, field.name, try std.json.innerParseFromValue(field.type, allocator, source, options)) },
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else => {},
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},
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},
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}
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}
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return error.UnexpectedToken;
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}
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};
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}
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pub fn NeverNull(comptime T: type, comptime default_value: T) type {
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return struct {
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const Self = @This();
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value: T = default_value,
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pub fn jsonParse(allocator: std.mem.Allocator, source: anytype, options: std.json.ParseOptions) !Self {
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return .{ .value = (try std.json.innerParse(?T, allocator, source, options)) orelse default_value };
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}
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pub fn jsonParseFromValue(allocator: std.mem.Allocator, source: std.json.Value, options: std.json.ParseOptions) !Self {
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return .{ .value = (try std.json.innerParseFromValue(?T, allocator, source, options)) orelse default_value };
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}
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};
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}
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pub fn fillDefaultStructValues(comptime T: type, r: *T) !void {
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inline for (@typeInfo(T).Struct.fields) |field| {
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if (field.default_value) |default_ptr| {
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if (@field(r, field.name) == null) {
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const default = @as(*align(1) const field.type, @ptrCast(default_ptr)).*;
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@field(r, field.name) = default;
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}
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}
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}
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}
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