More serialization refactor
This commit is contained in:
parent
c7dcded04a
commit
83af6a40e4
2 changed files with 116 additions and 157 deletions
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@ -8,8 +8,9 @@ pub const Url = @import("./Url.zig");
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pub const PathIter = iters.PathIter;
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pub const PathIter = iters.PathIter;
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pub const QueryIter = iters.QueryIter;
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pub const QueryIter = iters.QueryIter;
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pub const SqlStmtIter = iters.Separator(';');
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pub const SqlStmtIter = iters.Separator(';');
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pub const deserialize = @import("./deserialize.zig");
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pub const serialize = @import("./serialize.zig");
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pub const Deserializer = deserialize.Deserializer;
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pub const Deserializer = serialize.Deserializer;
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pub const DeserializerContext = serialize.DeserializerContext;
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/// Joins an array of strings, prefixing every entry with `prefix`,
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/// Joins an array of strings, prefixing every entry with `prefix`,
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/// and putting `separator` in between each pair
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/// and putting `separator` in between each pair
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@ -3,9 +3,8 @@ const util = @import("./lib.zig");
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const FieldRef = []const []const u8;
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const FieldRef = []const []const u8;
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const QueryStringOptions = struct {
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fn defaultIsScalar(comptime T: type) bool {
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fn isScalar(comptime T: type) bool {
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if (comptime std.meta.trait.is(.Optional)(T) and defaultIsScalar(std.meta.Child(T))) return true;
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if (comptime std.meta.trait.is(.Optional)(T) and isScalar(std.meta.Child(T))) return true;
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if (comptime std.meta.trait.isZigString(T)) return true;
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if (comptime std.meta.trait.isZigString(T)) return true;
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if (comptime std.meta.trait.isIntegral(T)) return true;
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if (comptime std.meta.trait.isIntegral(T)) return true;
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if (comptime std.meta.trait.isFloat(T)) return true;
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if (comptime std.meta.trait.isFloat(T)) return true;
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@ -17,111 +16,27 @@ const QueryStringOptions = struct {
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return false;
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return false;
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}
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}
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const embed_unions = true;
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pub fn deserializeString(allocator: std.mem.Allocator, comptime T: type, value: []const u8) !T {
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const ParsedField = ?[]const u8;
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if (comptime std.meta.trait.is(.Optional)(T)) {
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if (value.len == 0) return null;
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fn deserializeScalar(comptime T: type, maybe_value: ParsedField) !T {
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return try deserializeString(allocator, std.meta.Child(T), value);
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const is_optional = comptime std.meta.trait.is(.Optional)(T);
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if (maybe_value) |value| {
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const Eff = if (is_optional) std.meta.Child(T) else T;
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// Treat all empty values as nulls if possible
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if (value.len == 0 and is_optional) return null;
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// TODO:
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//const decoded = try decodeString(alloc, value);
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const decoded = value;
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if (comptime std.meta.trait.isZigString(Eff)) return decoded;
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// TOOD:
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//defer alloc.free(decoded);
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if (comptime std.meta.trait.isIntegral(Eff)) return try std.fmt.parseInt(Eff, decoded, 0);
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if (comptime std.meta.trait.isFloat(Eff)) return try std.fmt.parseFloat(Eff, decoded);
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if (comptime std.meta.trait.is(.Enum)(Eff)) {
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//_ = std.ascii.lowerString(decoded, decoded);
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return std.meta.stringToEnum(Eff, decoded) orelse return error.InvalidEnumValue;
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}
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if (Eff == bool) {
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//_ = std.ascii.lowerString(decoded, decoded);
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return bool_map.get(decoded) orelse return error.InvalidBool;
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}
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if (comptime std.meta.trait.hasFn("parse")(Eff)) return try Eff.parse(decoded);
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@compileError("Invalid type " ++ @typeName(T));
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} else {
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// Parameter is present, but no associated value
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return if (is_optional)
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null
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else if (T == bool)
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true
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else
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error.MissingValue;
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}
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}
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};
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const FormDataField = struct {
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filename: ?[]const u8 = null,
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charset: ?[]const u8 = null,
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value: []const u8,
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};
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const FormFile = struct {
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filename: []const u8,
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value: []const u8,
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};
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const FormDataOptions = struct {
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const embed_unions = true;
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fn isScalar(comptime T: type) bool {
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if (comptime std.meta.trait.is(.Optional)(T) and isScalar(std.meta.Child(T))) return true;
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if (comptime std.meta.trait.isZigString(T)) return true;
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if (comptime std.meta.trait.isIntegral(T)) return true;
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if (comptime std.meta.trait.isFloat(T)) return true;
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if (comptime std.meta.trait.is(.Enum)(T)) return true;
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if (comptime std.meta.trait.is(.EnumLiteral)(T)) return true;
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if (comptime std.meta.trait.hasFn("parse")(T)) return true;
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if (T == bool) return true;
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return false;
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}
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const ParsedField = FormDataField;
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fn deserializeScalar(comptime T: type, field: FormDataField) !T {
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// TODO: allocation??
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if (T == FormFile) {
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return FormFile{
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.filename = field.filename orelse "untitled",
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.data = field.value,
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};
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}
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}
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const decoded = field.value;
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if (T == []u8 or T == []const u8) return try util.deepClone(allocator, value);
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if (comptime std.meta.trait.isIntegral(T)) return try std.fmt.parseInt(T, value, 0);
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if (comptime std.meta.trait.isFloat(T)) return try std.fmt.parseFloat(T, value);
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if (comptime std.meta.trait.hasFn("parse")(T)) return try T.parse(value);
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if (comptime std.meta.trait.isZigString(T)) return decoded;
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var buf: [64]u8 = undefined;
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const lowered = std.ascii.lowerString(&buf, value);
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// TOOD:
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if (T == bool) return bool_map.get(lowered) orelse return error.InvalidBool;
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//defer alloc.free(decoded);
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if (comptime std.meta.trait.isIntegral(T)) return try std.fmt.parseInt(T, decoded, 0);
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if (comptime std.meta.trait.isFloat(T)) return try std.fmt.parseFloat(T, decoded);
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if (comptime std.meta.trait.is(.Enum)(T)) {
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if (comptime std.meta.trait.is(.Enum)(T)) {
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//_ = std.ascii.lowerString(decoded, decoded);
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return std.meta.stringToEnum(T, lowered) orelse return error.InvalidEnumTag;
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return std.meta.stringToEnum(T, decoded) orelse return error.InvalidEnumValue;
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}
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}
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if (T == bool) {
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//_ = std.ascii.lowerString(decoded, decoded);
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return bool_map.get(decoded) orelse return error.InvalidBool;
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}
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if (comptime std.meta.trait.hasFn("parse")(T)) return try T.parse(decoded);
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@compileError("Invalid type " ++ @typeName(T));
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@compileError("Invalid type " ++ @typeName(T));
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}
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}
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};
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fn getRecursiveFieldList(comptime T: type, comptime prefix: FieldRef, comptime options: SerializationOptions) []const FieldRef {
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fn getRecursiveFieldList(comptime T: type, comptime prefix: FieldRef, comptime options: SerializationOptions) []const FieldRef {
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comptime {
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comptime {
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@ -149,9 +64,14 @@ fn getRecursiveFieldList(comptime T: type, comptime prefix: FieldRef, comptime o
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}
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}
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}
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}
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const SerializationOptions = struct {
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pub const SerializationOptions = struct {
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embed_unions: bool = true,
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embed_unions: bool,
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isScalar: fn (type) bool = QueryStringOptions.isScalar,
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isScalar: fn (type) bool,
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};
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pub const default_options = SerializationOptions{
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.embed_unions = true,
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.isScalar = defaultIsScalar,
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};
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};
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fn Intermediary(comptime Result: type, comptime From: type, comptime options: SerializationOptions) type {
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fn Intermediary(comptime Result: type, comptime From: type, comptime options: SerializationOptions) type {
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@ -159,7 +79,6 @@ fn Intermediary(comptime Result: type, comptime From: type, comptime options: Se
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var fields: [field_refs.len]std.builtin.Type.StructField = undefined;
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var fields: [field_refs.len]std.builtin.Type.StructField = undefined;
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for (field_refs) |ref, i| {
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for (field_refs) |ref, i| {
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//@compileLog(i, ref, util.comptimeJoin(".", ref));
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fields[i] = .{
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fields[i] = .{
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.name = util.comptimeJoin(".", ref),
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.name = util.comptimeJoin(".", ref),
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.field_type = ?From,
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.field_type = ?From,
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@ -177,15 +96,16 @@ fn Intermediary(comptime Result: type, comptime From: type, comptime options: Se
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} });
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} });
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}
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}
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pub fn Deserializer(comptime Result: type, comptime From: type) type {
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pub fn Deserializer(comptime Result: type) type {
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return DeserializerContext(Result, From, struct {
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return DeserializerContext(Result, []const u8, struct {
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const options = SerializationOptions{};
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const options = default_options;
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const deserializeScalar = QueryStringOptions.deserializeScalar;
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fn deserializeScalar(_: @This(), alloc: std.mem.Allocator, comptime T: type, val: []const u8) !T {
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const isScalar = QueryStringOptions.isScalar;
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return try deserializeString(alloc, T, val);
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}
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});
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});
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}
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}
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fn DeserializerContext(comptime Result: type, comptime From: type, comptime Context: type) type {
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pub fn DeserializerContext(comptime Result: type, comptime From: type, comptime Context: type) type {
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return struct {
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return struct {
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const Data = Intermediary(Result, From, Context.options);
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const Data = Intermediary(Result, From, Context.options);
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@ -206,8 +126,12 @@ fn DeserializerContext(comptime Result: type, comptime From: type, comptime Cont
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return error.UnknownField;
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return error.UnknownField;
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}
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}
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pub fn finish(self: *@This()) !Result {
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pub fn finishFree(_: *@This(), allocator: std.mem.Allocator, val: anytype) void {
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return (try self.deserialize(Result, &.{})) orelse error.MissingField;
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util.deepFree(allocator, val);
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}
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pub fn finish(self: *@This(), allocator: std.mem.Allocator) !Result {
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return (try self.deserialize(allocator, Result, &.{})) orelse error.MissingField;
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}
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}
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fn getSerializedField(self: *@This(), comptime field_ref: FieldRef) ?From {
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fn getSerializedField(self: *@This(), comptime field_ref: FieldRef) ?From {
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@ -215,9 +139,13 @@ fn DeserializerContext(comptime Result: type, comptime From: type, comptime Cont
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return @field(self.data, util.comptimeJoin(".", field_ref));
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return @field(self.data, util.comptimeJoin(".", field_ref));
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}
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}
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fn deserialize(self: *@This(), comptime T: type, comptime field_ref: FieldRef) !?T {
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fn deserializeFree(_: *@This(), allocator: std.mem.Allocator, val: anytype) void {
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if (comptime Context.isScalar(T)) {
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util.deepFree(allocator, val);
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return try Context.deserializeScalar(T, self.getSerializedField(field_ref) orelse return null);
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}
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fn deserialize(self: *@This(), allocator: std.mem.Allocator, comptime T: type, comptime field_ref: FieldRef) !?T {
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if (comptime Context.options.isScalar(T)) {
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return try self.context.deserializeScalar(allocator, T, self.getSerializedField(field_ref) orelse return null);
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}
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}
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switch (@typeInfo(T)) {
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switch (@typeInfo(T)) {
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@ -225,14 +153,16 @@ fn DeserializerContext(comptime Result: type, comptime From: type, comptime Cont
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// in its parent container
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// in its parent container
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.Union => |info| {
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.Union => |info| {
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var result: ?T = null;
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var result: ?T = null;
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errdefer if (result) |v| self.deserializeFree(allocator, v);
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// TODO: errdefer cleanup
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// TODO: errdefer cleanup
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const union_ref: FieldRef = if (Context.options.embed_unions) field_ref[0 .. field_ref.len - 1] else field_ref;
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const union_ref: FieldRef = if (Context.options.embed_unions) field_ref[0 .. field_ref.len - 1] else field_ref;
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inline for (info.fields) |field| {
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inline for (info.fields) |field| {
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const F = field.field_type;
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const F = field.field_type;
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const new_field_ref = union_ref ++ &[_][]const u8{field.name};
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const new_field_ref = union_ref ++ &[_][]const u8{field.name};
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const maybe_value = try self.deserialize(F, new_field_ref);
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const maybe_value = try self.deserialize(allocator, F, new_field_ref);
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if (maybe_value) |value| {
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if (maybe_value) |value| {
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// TODO: errdefer cleanup
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// TODO: errdefer cleanup
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errdefer self.deserializeFree(allocator, value);
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if (result != null) return error.DuplicateUnionMember;
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if (result != null) return error.DuplicateUnionMember;
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result = @unionInit(T, field.name, value);
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result = @unionInit(T, field.name, value);
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}
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}
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var any_explicit = false;
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var any_explicit = false;
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var any_missing = false;
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var any_missing = false;
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inline for (info.fields) |field| {
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var fields_alloced = [1]bool{false} ** info.fields.len;
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errdefer inline for (info.fields) |field, i| {
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if (fields_alloced[i]) self.deserializeFree(allocator, @field(result, field.name));
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};
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inline for (info.fields) |field, i| {
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const F = field.field_type;
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const F = field.field_type;
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const new_field_ref = field_ref ++ &[_][]const u8{field.name};
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const new_field_ref = field_ref ++ &[_][]const u8{field.name};
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const maybe_value = try self.deserialize(F, new_field_ref);
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const maybe_value = try self.deserialize(allocator, F, new_field_ref);
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if (maybe_value) |v| {
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if (maybe_value) |v| {
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@field(result, field.name) = v;
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@field(result, field.name) = v;
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fields_alloced[i] = true;
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any_explicit = true;
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any_explicit = true;
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} else if (field.default_value) |ptr| {
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} else if (field.default_value) |ptr| {
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if (@sizeOf(F) != 0) {
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if (@sizeOf(F) != 0) {
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@field(result, field.name) = @ptrCast(*const F, @alignCast(field.alignment, ptr)).*;
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const cast_ptr = @ptrCast(*const F, @alignCast(field.alignment, ptr));
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@field(result, field.name) = try util.deepClone(allocator, cast_ptr.*);
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fields_alloced[i] = true;
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}
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}
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} else {
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} else {
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any_missing = true;
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any_missing = true;
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@ -268,7 +205,7 @@ fn DeserializerContext(comptime Result: type, comptime From: type, comptime Cont
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},
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},
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// Specifically non-scalar optionals
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// Specifically non-scalar optionals
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.Optional => |info| return try self.deserialize(info.child, field_ref),
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.Optional => |info| return try self.deserialize(allocator, info.child, field_ref),
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else => @compileError("Unsupported type"),
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else => @compileError("Unsupported type"),
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}
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}
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@ -294,19 +231,22 @@ test "Deserializer" {
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// Happy case - simple
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// Happy case - simple
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{
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{
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const T = struct { foo: usize, bar: bool };
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const T = struct { foo: []const u8, bar: bool };
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var ds = Deserializer(T, []const u8){};
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var ds = Deserializer(T){};
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try ds.setSerializedField("foo", "123");
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try ds.setSerializedField("foo", "123");
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try ds.setSerializedField("bar", "true");
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try ds.setSerializedField("bar", "true");
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try std.testing.expectEqual(T{ .foo = 123, .bar = true }, try ds.finish());
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const val = try ds.finish(std.testing.allocator);
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defer ds.finishFree(std.testing.allocator, val);
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try util.testing.expectDeepEqual(T{ .foo = "123", .bar = true }, val);
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}
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}
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// Returns error if nonexistent field set
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// Returns error if nonexistent field set
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{
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{
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const T = struct { foo: usize, bar: bool };
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const T = struct { foo: []const u8, bar: bool };
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var ds = Deserializer(T, []const u8){};
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var ds = Deserializer(T){};
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try std.testing.expectError(error.UnknownField, ds.setSerializedField("baz", "123"));
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try std.testing.expectError(error.UnknownField, ds.setSerializedField("baz", "123"));
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}
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}
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||||||
|
@ -316,10 +256,13 @@ test "Deserializer" {
|
||||||
foo: struct { bar: bool, baz: bool },
|
foo: struct { bar: bool, baz: bool },
|
||||||
};
|
};
|
||||||
|
|
||||||
var ds = Deserializer(T, []const u8){};
|
var ds = Deserializer(T){};
|
||||||
try ds.setSerializedField("foo.bar", "true");
|
try ds.setSerializedField("foo.bar", "true");
|
||||||
try ds.setSerializedField("foo.baz", "true");
|
try ds.setSerializedField("foo.baz", "true");
|
||||||
try std.testing.expectEqual(T{ .foo = .{ .bar = true, .baz = true } }, try ds.finish());
|
|
||||||
|
const val = try ds.finish(std.testing.allocator);
|
||||||
|
defer ds.finishFree(std.testing.allocator, val);
|
||||||
|
try util.testing.expectDeepEqual(T{ .foo = .{ .bar = true, .baz = true } }, val);
|
||||||
}
|
}
|
||||||
|
|
||||||
// Union embedding
|
// Union embedding
|
||||||
|
@ -328,9 +271,12 @@ test "Deserializer" {
|
||||||
foo: union(enum) { bar: bool, baz: bool },
|
foo: union(enum) { bar: bool, baz: bool },
|
||||||
};
|
};
|
||||||
|
|
||||||
var ds = Deserializer(T, []const u8){};
|
var ds = Deserializer(T){};
|
||||||
try ds.setSerializedField("bar", "true");
|
try ds.setSerializedField("bar", "true");
|
||||||
try std.testing.expectEqual(T{ .foo = .{ .bar = true } }, try ds.finish());
|
|
||||||
|
const val = try ds.finish(std.testing.allocator);
|
||||||
|
defer ds.finishFree(std.testing.allocator, val);
|
||||||
|
try util.testing.expectDeepEqual(T{ .foo = .{ .bar = true } }, val);
|
||||||
}
|
}
|
||||||
|
|
||||||
// Returns error if multiple union fields specified
|
// Returns error if multiple union fields specified
|
||||||
|
@ -339,27 +285,32 @@ test "Deserializer" {
|
||||||
foo: union(enum) { bar: bool, baz: bool },
|
foo: union(enum) { bar: bool, baz: bool },
|
||||||
};
|
};
|
||||||
|
|
||||||
var ds = Deserializer(T, []const u8){};
|
var ds = Deserializer(T){};
|
||||||
try ds.setSerializedField("bar", "true");
|
try ds.setSerializedField("bar", "true");
|
||||||
try ds.setSerializedField("baz", "true");
|
try ds.setSerializedField("baz", "true");
|
||||||
try std.testing.expectError(error.DuplicateUnionMember, ds.finish());
|
|
||||||
|
try std.testing.expectError(error.DuplicateUnionMember, ds.finish(std.testing.allocator));
|
||||||
}
|
}
|
||||||
|
|
||||||
// Uses default values if fields aren't provided
|
// Uses default values if fields aren't provided
|
||||||
{
|
{
|
||||||
const T = struct { foo: usize = 123, bar: bool = true };
|
const T = struct { foo: []const u8 = "123", bar: bool = true };
|
||||||
|
|
||||||
var ds = Deserializer(T, []const u8){};
|
var ds = Deserializer(T){};
|
||||||
try std.testing.expectEqual(T{ .foo = 123, .bar = true }, try ds.finish());
|
|
||||||
|
const val = try ds.finish(std.testing.allocator);
|
||||||
|
defer ds.finishFree(std.testing.allocator, val);
|
||||||
|
try util.testing.expectDeepEqual(T{ .foo = "123", .bar = true }, val);
|
||||||
}
|
}
|
||||||
|
|
||||||
// Returns an error if fields aren't provided and no default exists
|
// Returns an error if fields aren't provided and no default exists
|
||||||
{
|
{
|
||||||
const T = struct { foo: usize, bar: bool };
|
const T = struct { foo: []const u8, bar: bool };
|
||||||
|
|
||||||
var ds = Deserializer(T, []const u8){};
|
var ds = Deserializer(T){};
|
||||||
try ds.setSerializedField("foo", "123");
|
try ds.setSerializedField("foo", "123");
|
||||||
try std.testing.expectError(error.MissingField, ds.finish());
|
|
||||||
|
try std.testing.expectError(error.MissingField, ds.finish(std.testing.allocator));
|
||||||
}
|
}
|
||||||
|
|
||||||
// Handles optional containers
|
// Handles optional containers
|
||||||
|
@ -369,8 +320,11 @@ test "Deserializer" {
|
||||||
qux: ?union(enum) { quux: usize } = null,
|
qux: ?union(enum) { quux: usize } = null,
|
||||||
};
|
};
|
||||||
|
|
||||||
var ds = Deserializer(T, []const u8){};
|
var ds = Deserializer(T){};
|
||||||
try std.testing.expectEqual(T{ .foo = null, .qux = null }, try ds.finish());
|
|
||||||
|
const val = try ds.finish(std.testing.allocator);
|
||||||
|
defer ds.finishFree(std.testing.allocator, val);
|
||||||
|
try util.testing.expectDeepEqual(T{ .foo = null, .qux = null }, val);
|
||||||
}
|
}
|
||||||
|
|
||||||
{
|
{
|
||||||
|
@ -379,10 +333,13 @@ test "Deserializer" {
|
||||||
qux: ?union(enum) { quux: usize } = null,
|
qux: ?union(enum) { quux: usize } = null,
|
||||||
};
|
};
|
||||||
|
|
||||||
var ds = Deserializer(T, []const u8){};
|
var ds = Deserializer(T){};
|
||||||
try ds.setSerializedField("foo.baz", "3");
|
try ds.setSerializedField("foo.baz", "3");
|
||||||
try ds.setSerializedField("quux", "3");
|
try ds.setSerializedField("quux", "3");
|
||||||
try std.testing.expectEqual(T{ .foo = .{ .bar = 3, .baz = 3 }, .qux = .{ .quux = 3 } }, try ds.finish());
|
|
||||||
|
const val = try ds.finish(std.testing.allocator);
|
||||||
|
defer ds.finishFree(std.testing.allocator, val);
|
||||||
|
try util.testing.expectDeepEqual(T{ .foo = .{ .bar = 3, .baz = 3 }, .qux = .{ .quux = 3 } }, val);
|
||||||
}
|
}
|
||||||
|
|
||||||
{
|
{
|
||||||
|
@ -391,9 +348,10 @@ test "Deserializer" {
|
||||||
qux: ?union(enum) { quux: usize } = null,
|
qux: ?union(enum) { quux: usize } = null,
|
||||||
};
|
};
|
||||||
|
|
||||||
var ds = Deserializer(T, []const u8){};
|
var ds = Deserializer(T){};
|
||||||
try ds.setSerializedField("foo.bar", "3");
|
try ds.setSerializedField("foo.bar", "3");
|
||||||
try ds.setSerializedField("quux", "3");
|
try ds.setSerializedField("quux", "3");
|
||||||
try std.testing.expectError(error.MissingField, ds.finish());
|
|
||||||
|
try std.testing.expectError(error.MissingField, ds.finish(std.testing.allocator));
|
||||||
}
|
}
|
||||||
}
|
}
|
Loading…
Reference in a new issue