1d311b871e
Close the coverage gap from attempt 1: example 0713 now builds integer fields holding s64 MIN (-9223372036854775808) and s64 MAX (9223372036854775807) — plus zero, a small negative, and a small positive — and asserts the EXACT emitted bytes. This permanently pins the edge that write_int is specifically engineered for (folding positives into negative space so MIN's non-representable-positive magnitude serializes correctly). s64 MIN is expressed as (0 - 9223372036854775807 - 1) because its magnitude is not a representable positive s64 literal. Test hygiene: stream to a repo-local, gitignored .sx-tmp/ path (created if missing) instead of a fixed /tmp name, and unlink it right after read-back so nothing leaks. Writer/model logic and src/ are untouched.
107 lines
4.5 KiB
Plaintext
107 lines
4.5 KiB
Plaintext
// JSON value model + writer from `modules/std/json.sx`.
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//
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// Builds a representative value — a nested object holding a string with
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// every escape kind (quote, newline, tab, backslash, a raw control byte),
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// integers spanning zero / a small negative / a small positive / s64 MIN
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// (-9223372036854775808) / s64 MAX (9223372036854775807), a bool, null, an
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// array, and a nested object — then serializes it two ways and asserts the
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// EXACT bytes:
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//
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// 1. into a caller-owned `[]u8` buffer (returns bytes written),
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// 2. streaming straight to a file through an 8-byte staging buffer
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// (small on purpose, so the writer flushes many times and no
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// whole-document string is ever held).
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//
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// Both must yield byte-for-byte the same pinned document, with keys in
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// INSERTION ORDER. A too-small buffer must raise `error.Overflow` rather
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// than truncate. The model is built through an explicit Arena allocator
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// and freed in one `deinit`; the writer path allocates nothing.
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#import "modules/std.sx";
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#import "modules/std/json.sx";
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#import "modules/fs.sx";
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// The exact document the writer must produce (insertion order, escaping).
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EXPECT :: "{\"name\":\"a\\\"b\\n\",\"tab\":\"x\\ty\",\"bs\":\"c\\\\d\",\"ctrl\":\"\\u0001\",\"n\":-7,\"zero\":0,\"pos\":7,\"min\":-9223372036854775808,\"max\":9223372036854775807,\"ok\":true,\"nil\":null,\"xs\":[1,-2,3],\"nested\":{\"k\":\"v\"}}";
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report :: (label: string, ok: bool) {
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if ok { print("{}: ok\n", label); } else { print("{}: FAIL\n", label); }
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}
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build :: (alloc: Allocator) -> Value {
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// A raw control byte (0x01) viewed as a 1-byte string — exercises the
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// `\u00XX` path that has no named shorthand. String values are VIEWS,
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// so the bytes must outlive the writes: back them with `alloc` (the
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// arena), not a local that dies when `build` returns.
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cbytes : [*]u8 = xx alloc.alloc(1);
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cbytes[0] = 1;
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ctrl := string.{ ptr = cbytes, len = 1 };
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nested : Object = .{};
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nested.put("k", .str("v"), alloc);
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xs : Array = .{};
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xs.add(.int_(1), alloc);
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xs.add(.int_(0 - 2), alloc);
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xs.add(.int_(3), alloc);
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obj : Object = .{};
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obj.put("name", .str("a\"b\n"), alloc); // quote + newline
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obj.put("tab", .str("x\ty"), alloc); // tab
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obj.put("bs", .str("c\\d"), alloc); // backslash
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obj.put("ctrl", .str(ctrl), alloc); // raw control byte ->
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obj.put("n", .int_(0 - 7), alloc); // small negative int
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obj.put("zero", .int_(0), alloc); // zero
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obj.put("pos", .int_(7), alloc); // small positive int
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// s64 MIN: its magnitude (9223372036854775808) is not a representable
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// positive s64 literal, so build it from MAX-positive minus one.
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obj.put("min", .int_(0 - 9223372036854775807 - 1), alloc);
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obj.put("max", .int_(9223372036854775807), alloc); // s64 MAX
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obj.put("ok", .bool_(true), alloc);
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obj.put("nil", .null_, alloc);
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obj.put("xs", .array(xs), alloc);
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obj.put("nested", .object(nested), alloc);
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return .object(obj);
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}
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main :: () -> ! {
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gpa := GPA.init();
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arena := Arena.init(xx gpa, 4096);
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defer arena.deinit();
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root := build(xx arena);
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// 1. Write into a caller buffer; assert exact bytes + byte count.
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buf : [512]u8 = ---;
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n := try write_to_buffer(root, string.{ ptr = @buf[0], len = 512 });
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view := string.{ ptr = @buf[0], len = n };
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print("doc: {}\n", view);
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report("buffer-exact", view == EXPECT);
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report("buffer-len", n == EXPECT.len);
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// 2. A buffer that is one byte too small must raise Overflow.
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tight : []u8 = string.{ ptr = @buf[256], len = EXPECT.len - 1 };
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_, oerr := write_to_buffer(root, tight);
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report("overflow-raised", oerr == error.Overflow);
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// 3. Stream to a file through a tiny staging buffer (forces flushes);
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// read it back and assert it equals the same document. Write into the
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// repo-local, gitignored scratch dir and unlink afterwards so nothing
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// leaks and concurrent runs don't fight over a shared /tmp name.
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if !create_dir_all(".sx-tmp") { print("mkdir: FAIL\n"); return; }
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path := ".sx-tmp/sx_0713_json.json";
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fh := open_file(path, .write);
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if fh == null { print("open: FAIL\n"); return; }
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f := fh!;
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stage : [8]u8 = ---;
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try write_to_file(root, @f, string.{ ptr = @stage[0], len = 8 });
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f.close();
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back := read_file(path);
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delete_file(path);
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if back == null { print("file-read: FAIL\n"); return; }
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report("file-exact", back! == EXPECT);
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return;
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}
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