bdd0e96d78
A block's value is now its last statement ONLY when that statement is a trailing expression with no `;`. A trailing `;` discards the value, leaving the block void. This makes value-vs-statement explicit and lets the compiler reject "this block was supposed to produce a value". Compiler: - Parser records `Block.produces_value` (last stmt is a no-`;` trailing expression) + `Block.discarded_semi` (the `;` that discarded a value), via `expectSemicolonAfter`. A trailing expression before `}` may now omit its `;` (previously a parse error). Match-arm and else-arm bodies are built value-producing regardless of the arm `;` (arms are exempt — the `;` is an arm terminator). - Lowering: `lowerBlockValue` / the block-expr path / `inferExprType` respect `produces_value`. A value-position block that discards its value is a hard error (`lowerValueBody` for function bodies; the value-context `.block` path for if/else branches, `catch` bodies, value bindings, match arms). Pure-failable `-> !` bodies (value rides the error channel) and a value-if whose branches are void are handled without false errors. - `defer`/`onfail` cleanup bodies lower as statements (void), so a trailing `;` there is fine. Migration (behavior-preserving — output unchanged): - stdlib + ~210 examples: dropped the trailing `;` on value-position last expressions. `format` now ends with an explicit `#insert "return result;"` (it relied on `#insert`-as-block-value, which `;` discards). - Two `main :: () -> s32` examples that relied on the old silent default-return got an explicit trailing `0`. - Rejection snapshots 0412 / 1013 regenerated (their quoted source lines lost a `;`); the diagnostics themselves are unchanged. Docs/tests: specs.md "Block values" section; examples 0040 (rules) + 0041 (rejection); 3 parser unit tests. Filed issue 0066 (pre-existing match-arm negated-literal phi-width quirk, surfaced not caused here). Gates: zig build, zig build test, run_examples.sh -> 343 passed, cross_compile.sh -> 7 passed (also refreshed its stale example names).
81 lines
1.7 KiB
Plaintext
81 lines
1.7 KiB
Plaintext
// HTTP server example (macOS only)
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#import "modules/std.sx";
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#import "modules/socket.sx";
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// --- Logger ---
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Logger :: struct {
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prefix: string;
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count: s64;
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}
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log :: (logger: *Logger, msg: string) {
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logger.count += 1;
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print("[{}] {}\n", logger.prefix, msg);
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}
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main :: () -> s32 {
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PORT :: 8080;
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fd := socket(AF_INET, SOCK_STREAM, 0);
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if fd < 0 {
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print("error: socket()\n");
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return 1;
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}
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opt : s32 = 1;
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setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, @opt, 4);
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addr := SockAddr.{ sin_len = 16, sin_family = 2, sin_port = htons(PORT) };
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if bind(fd, @addr, 16) < 0 {
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print("error: bind()\n");
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return 1;
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}
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if listen(fd, 10) < 0 {
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print("error: listen()\n");
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return 1;
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}
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print("listening on http://localhost:{}\n", PORT);
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arena := Arena.init(context.allocator, 65536);
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logger := Logger.{ prefix = "http", count = 0 };
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while true {
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client := accept(fd, null, null);
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if client < 0 { continue; }
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push Context.{ allocator = xx arena, data = xx @logger } {
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handle(client);
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}
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arena.reset();
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close(client);
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}
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arena.deinit();
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close(fd);
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0
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}
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handle :: (client: s32) {
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// Read request
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buf : [4096]u8 = ---;
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read(client, buf, buf.len);
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body :: "<html><body><h1>Hello from sx!</h1></body></html>";
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response :: format("HTTP/1.1 200 OK\r
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Content-Type: text/html\r
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Connection: close\r
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Content-Length: {}\r
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\r\n{}", body.len, body);
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write(client, response, response.len);
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logger : *Logger = xx context.data;
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log(logger, format("served request #{}", logger.count + 1));
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} |