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std.json: support parsing json at comptime using FixedBufferAllocator (#16488)

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Josh Wolfe 2023-07-22 18:52:26 -04:00 • committed by GitHub
parent 2ad16248d7
commit c72a9feabe
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2 changed files with 27 additions and 2 deletions
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4
lib/std/heap.zig
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@ -436,7 +436,7 @@ pub const FixedBufferAllocator = struct {
const self: *FixedBufferAllocator = @ptrCast(@alignCast(ctx));
_ = log2_buf_align;
_ = return_address;
assert(self.ownsSlice(buf)); // sanity check
assert(@inComptime() or self.ownsSlice(buf));
if (!self.isLastAllocation(buf)) {
if (new_size > buf.len) return false;
@ -465,7 +465,7 @@ pub const FixedBufferAllocator = struct {
const self: *FixedBufferAllocator = @ptrCast(@alignCast(ctx));
_ = log2_buf_align;
_ = return_address;
assert(self.ownsSlice(buf)); // sanity check
assert(@inComptime() or self.ownsSlice(buf));
if (self.isLastAllocation(buf)) {
self.end_index -= buf.len;

25
lib/std/json/static_test.zig
View file

@ -901,3 +901,28 @@ test "json parse allocate when streaming" {
try testing.expectEqualSlices(u8, parsed.not_const, "non const string");
try testing.expectEqualSlices(u8, parsed.is_const, "const string");
}
test "parse at comptime" {
const doc =
\\{
\\ "vals": {
\\ "testing": 1,
\\ "production": 42
\\ },
\\ "uptime": 9999
\\}
;
const Config = struct {
vals: struct { testing: u8, production: u8 },
uptime: u64,
};
const config = comptime x: {
var buf: [32]u8 = undefined;
var fba = std.heap.FixedBufferAllocator.init(&buf);
const res = parseFromSliceLeaky(Config, fba.allocator(), doc, .{});
// Assert no error can occur since we are
// parsing this JSON at comptime!
break :x res catch unreachable;
};
comptime testing.expectEqual(@as(u64, 9999), config.uptime) catch unreachable;
}