additional option for snake case
This will usually be enabled in conjunction with camelCase, to the degree that maybe this is a bit confused?
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1d10ec3e17
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49
src/json.zig
49
src/json.zig
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@ -1452,6 +1452,7 @@ pub const ParseOptions = struct {
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} = .Error,
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allow_camel_case_conversion: bool = false,
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allow_snake_case_conversion: bool = false,
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allow_unknown_fields: bool = false,
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};
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@ -1470,6 +1471,52 @@ fn camelCaseComp(field: []const u8, key: []const u8, options: ParseOptions) !boo
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}
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return std.mem.eql(u8, field, key);
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}
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fn snakeCaseComp(field: []const u8, key: []const u8, options: ParseOptions) !bool {
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// snake case is much more intricate. Input:
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// Field: user_id
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// Key: UserId
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// We can duplicate the field and remove all _ characters safely
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// Then take the key and lowercase all the uppercase.
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// Then compare
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var found: u32 = 0;
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for (field) |ch| {
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if (ch == '_') {
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found = found + 1;
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break;
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}
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}
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if (found == 0)
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return std.mem.eql(u8, field, key);
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// We have a snake case field. Let's do this
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const allocator = options.allocator orelse return error.AllocatorRequired;
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const comp_field = try allocator.alloc(u8, field.len - found);
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defer allocator.free(comp_field);
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var inx: u32 = 0;
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for (field) |ch| {
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if (ch != '_') {
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comp_field[inx] = ch;
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inx = inx + 1;
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}
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}
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// field = 'user_id', comp_field = 'userid'
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// We now transform the key by lowercasing. We will only deal with Latin
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var utf8_source_key = (std.unicode.Utf8View.init(key) catch unreachable).iterator();
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const normalized_key = try allocator.dupeZ(u8, key);
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defer allocator.free(normalized_key);
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inx = 0;
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while (utf8_source_key.nextCodepoint()) |codepoint| {
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if (codepoint > 255) return error.InvalidLiteral;
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if (codepoint >= 'A' and codepoint <= 'Z') {
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// First codepoint is uppercase Latin char, which is all we're handling atm
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normalized_key[inx] = normalized_key[inx] + ('a' - 'A');
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// We will assume the target field is in camelCase
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}
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inx = inx + 1;
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}
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return std.mem.eql(u8, comp_field, normalized_key);
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}
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fn parseInternal(comptime T: type, token: Token, tokens: *TokenStream, options: ParseOptions) !T {
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switch (@typeInfo(T)) {
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@ -1573,7 +1620,7 @@ fn parseInternal(comptime T: type, token: Token, tokens: *TokenStream, options:
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var found = false;
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inline for (structInfo.fields) |field, i| {
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// TODO: using switches here segfault the compiler (#2727?)
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if ((stringToken.escapes == .None and mem.eql(u8, field.name, key_source_slice)) or (stringToken.escapes == .Some and (field.name.len == stringToken.decodedLength() and encodesTo(field.name, key_source_slice))) or (stringToken.escapes == .None and options.allow_camel_case_conversion and try camelCaseComp(field.name, key_source_slice, options))) {
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if ((stringToken.escapes == .None and mem.eql(u8, field.name, key_source_slice)) or (stringToken.escapes == .Some and (field.name.len == stringToken.decodedLength() and encodesTo(field.name, key_source_slice))) or (stringToken.escapes == .None and options.allow_camel_case_conversion and try camelCaseComp(field.name, key_source_slice, options)) or (stringToken.escapes == .None and options.allow_snake_case_conversion and try snakeCaseComp(field.name, key_source_slice, options))) {
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// if (switch (stringToken.escapes) {
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// .None => mem.eql(u8, field.name, key_source_slice),
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// .Some => (field.name.len == stringToken.decodedLength() and encodesTo(field.name, key_source_slice)),
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