ww/test/wcc/110_uniesc_run.c

/*
 * 110_uniesc_run — \u / \U Unicode escapes, end-to-end through both
 * the cstage `ww` and the wwstage `ww_ww` drivers (task #50).
 *
 * Rune literals carry the raw codepoint; string literals UTF-8-encode
 * it into 1-4 bytes (ref/hare/hare/lex/lex.ha:347 lex_unicode + the
 * appendrune in lex_string). \x shares the same codepoint path, so a
 * >0x7F \x byte now widens to its 2-byte UTF-8 form in strings. Each
 * fixture returns 42 on a correct decode/encode.
 *
 * The dual-driver loop mirrors 640_int_cast_signed: the wwstage arm is
 * skipped when ww_ww is absent (e.g. a cstage-only build).
 *
 * The final per-driver case is a .wwi round-trip: an exported wide-rune
 * `def` re-serialized by the producer must re-parse byte-exact (the
 * write-twin of the lexer read-fix — cmd/w6c/wwi.c wwi_rune /
 * selfhost/cmd/wcc/wwi.ww wwirune emit \u/\U above 0xFF).
 */
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <sys/stat.h>
#include <sys/wait.h>

static int
runwait(const char *cmd)
{
	int rc = system(cmd);
	if (rc == -1) return -1;
	if (WIFEXITED(rc)) return WEXITSTATUS(rc);
	return -1;
}

struct row { const char *label; const char *src; int want; };

static const struct row rows[] = {
	/* \u (4 hex) rune → U+00E9 codepoint 233. */
	{ "rune_u_2byte",
	  "fn main() i32 = {\n"
	  "  let r: rune = '\\u00e9';\n"
	  "  if ((r: u32) == 233u32) { return 42; };\n"
	  "  return 0;\n"
	  "};\n",
	  42 },
	/* \U (8 hex) rune → U+1F600 codepoint 128512 (> 0xFFFF, the case
	 * that forced the `0x...: rune` int-cast spelling before #50). */
	{ "rune_U_emoji",
	  "fn main() i32 = {\n"
	  "  let r: rune = '\\U0001F600';\n"
	  "  if ((r: u32) == 128512u32) { return 42; };\n"
	  "  return 0;\n"
	  "};\n",
	  42 },
	/* \u é string → 2-byte UTF-8 0xC3 0xA9. */
	{ "str_u_2byte",
	  "package main;\n"
	  "import strings;\n"
	  "fn main() i32 = {\n"
	  "  let b: []u8 = strings.toutf8(\"\\u00e9\");\n"
	  "  if (len(b) != 2) { return 1; };\n"
	  "  if (b[0] != 0xc3u8) { return 2; };\n"
	  "  if (b[1] != 0xa9u8) { return 3; };\n"
	  "  return 42;\n"
	  "};\n",
	  42 },
	/* \u € string → 3-byte UTF-8 0xE2 0x82 0xAC. */
	{ "str_u_3byte",
	  "package main;\n"
	  "import strings;\n"
	  "fn main() i32 = {\n"
	  "  let b: []u8 = strings.toutf8(\"\\u20ac\");\n"
	  "  if (len(b) != 3) { return 1; };\n"
	  "  if (b[0] != 0xe2u8) { return 2; };\n"
	  "  if (b[1] != 0x82u8) { return 3; };\n"
	  "  if (b[2] != 0xacu8) { return 4; };\n"
	  "  return 42;\n"
	  "};\n",
	  42 },
	/* \U 😀 string → 4-byte UTF-8 0xF0 0x9F 0x98 0x80. */
	{ "str_U_4byte",
	  "package main;\n"
	  "import strings;\n"
	  "fn main() i32 = {\n"
	  "  let b: []u8 = strings.toutf8(\"\\U0001F600\");\n"
	  "  if (len(b) != 4) { return 1; };\n"
	  "  if (b[0] != 0xf0u8) { return 2; };\n"
	  "  if (b[1] != 0x9fu8) { return 3; };\n"
	  "  if (b[2] != 0x98u8) { return 4; };\n"
	  "  if (b[3] != 0x80u8) { return 5; };\n"
	  "  return 42;\n"
	  "};\n",
	  42 },
	/* \x ≥0x80 now yields a codepoint that UTF-8-encodes (\xe9 →
	 * U+00E9 → 0xC3 0xA9), matching Hare's shared escape path. */
	{ "str_x_widens",
	  "package main;\n"
	  "import strings;\n"
	  "fn main() i32 = {\n"
	  "  let b: []u8 = strings.toutf8(\"\\xe9\");\n"
	  "  if (len(b) != 2) { return 1; };\n"
	  "  if (b[0] != 0xc3u8) { return 2; };\n"
	  "  if (b[1] != 0xa9u8) { return 3; };\n"
	  "  return 42;\n"
	  "};\n",
	  42 },
};

static int
run_driver(const char *driver, const struct row *r, int i)
{
	char src[128], tmpdir[64], outbin[128], rmcmd[160], cmd[1024];
	snprintf(tmpdir, sizeof tmpdir, "/tmp/wwue_%d_d_%d", getpid(), i);
	mkdir(tmpdir, 0755);
	snprintf(src, sizeof src, "%s/wwue_%d_%d.ww", tmpdir, getpid(), i);
	snprintf(outbin, sizeof outbin, "%s/wwue_%d_%d", tmpdir, getpid(), i);
	snprintf(rmcmd, sizeof rmcmd, "rm -rf %s", tmpdir);

	FILE *f = fopen(src, "wb");
	if (!f) { runwait(rmcmd); return -1; }
	fputs(r->src, f);
	fclose(f);

	snprintf(cmd, sizeof cmd, "%s build -o %s %s", driver, outbin, src);
	if (runwait(cmd) != 0) {
		fprintf(stderr, "row[%s]: build via %s failed\n",
		    r->label, driver);
		runwait(rmcmd);
		return -1;
	}

	int got = runwait(outbin);

	runwait(rmcmd);
	return got;
}

/* run_roundtrip — sep-build a two-package program where the imported
 * package exports wide-rune defs; the producer must serialize them as
 * \u/\U so the importer re-parses the same codepoint. Returns the built
 * program's exit code (42 on a correct round-trip). */
static int
run_roundtrip(const char *driver, int id)
{
	char dir[80], wrdir[112], wrp[176], mainp[160], cmd[1024], outbin[160];
	snprintf(dir, sizeof dir, "/tmp/wwue_rt_%d_%d", getpid(), id);
	snprintf(wrdir, sizeof wrdir, "%s/wr", dir);
	mkdir(dir, 0755);
	mkdir(wrdir, 0755);
	snprintf(wrp, sizeof wrp, "%s/wr.ww", wrdir);
	snprintf(mainp, sizeof mainp, "%s/main.ww", dir);

	FILE *f = fopen(wrp, "wb");
	if (!f) {
		snprintf(cmd, sizeof cmd, "rm -rf %s", dir);
		(void)system(cmd);
		return -1;
	}
	/* one def per serializer branch: \x (<=0xFF), \u (<=0xFFFF), \U. */
	fputs("package wr;\n"
	      "export def EACUTE: rune = '\\u00e9';\n"
	      "export def EURO: rune = '\\u20ac';\n"
	      "export def SMILEY: rune = '\\U0001F600';\n", f);
	fclose(f);
	f = fopen(mainp, "wb");
	if (!f) {
		snprintf(cmd, sizeof cmd, "rm -rf %s", dir);
		(void)system(cmd);
		return -1;
	}
	fputs("package main;\n"
	      "import wr;\n"
	      "fn main() i32 = {\n"
	      "  let a: rune = wr.EACUTE;\n"
	      "  let b: rune = wr.EURO;\n"
	      "  let c: rune = wr.SMILEY;\n"
	      "  if ((a: u32) != 233u32) { return 1; };\n"
	      "  if ((b: u32) != 8364u32) { return 2; };\n"
	      "  if ((c: u32) != 128512u32) { return 3; };\n"
	      "  return 42;\n"
	      "};\n", f);
	fclose(f);

	snprintf(cmd, sizeof cmd, "cd %s && %s build main.ww", dir, driver);
	if (runwait(cmd) != 0) {
		fprintf(stderr, "roundtrip: build via %s failed\n", driver);
		snprintf(cmd, sizeof cmd, "rm -rf %s", dir);
		(void)system(cmd);
		return -1;
	}
	snprintf(outbin, sizeof outbin, "%s/main", dir);
	int got = runwait(outbin);
	snprintf(cmd, sizeof cmd, "rm -rf %s", dir);
	(void)system(cmd);
	return got;
}

int
main(void)
{
	const char *bin = getenv("BIN");
	if (!bin) bin = "out/bin";
	char absbin[1024];
	if (bin[0] != '/') {
		char cwd[1024];
		if (getcwd(cwd, sizeof cwd) == NULL) return 1;
		snprintf(absbin, sizeof absbin, "%s/%s", cwd, bin);
		bin = absbin;
	}

	char cdrv[1024];
	snprintf(cdrv, sizeof cdrv, "%s/ww", bin);
	char wdrv[1024];
	snprintf(wdrv, sizeof wdrv, "%s/ww_ww", bin);

	struct { const char *name; const char *path; int gated_on_existence; }
	drivers[] = {
		{ "cstage", cdrv, 0 },
		{ "wwstage", wdrv, 1 },
		{ NULL, NULL, 0 },
	};

	int n = (int)(sizeof rows / sizeof rows[0]);
	int total = 0, fail = 0;
	for (int d = 0; drivers[d].name; d++) {
		if (drivers[d].gated_on_existence
		    && access(drivers[d].path, X_OK) != 0) {
			fprintf(stderr, "uniesc_run: skip %s (no %s)\n",
			    drivers[d].name, drivers[d].path);
			continue;
		}
		for (int i = 0; i < n; i++) {
			int got = run_driver(drivers[d].path, &rows[i], i);
			total++;
			if (got != rows[i].want) {
				fprintf(stderr,
				    "uniesc_run[%s][%s]: exit=%d want=%d\n",
				    drivers[d].name, rows[i].label,
				    got, rows[i].want);
				fail++;
			}
		}
		int rt = run_roundtrip(drivers[d].path, d);
		total++;
		if (rt != 42) {
			fprintf(stderr,
			    "uniesc_run[%s][wwi_roundtrip]: exit=%d want=42\n",
			    drivers[d].name, rt);
			fail++;
		}
	}
	if (fail) {
		fprintf(stderr, "uniesc_run: %d/%d fixtures failed\n",
		    fail, total);
		return 1;
	}
	printf("uniesc_run: %d/%d ok\n", total, total);
	return 0;
}