// CLI argument PARSER from `modules/std/cli.sx` (F3.2) — subcommand // dispatch + `--flag` parsing over an EXPLICIT logical argv (`[]string`). // // Every argv vector below is an explicit `[]string` literal (the caller's // logical args, program name already removed). The suite proves: // // 1. DISPATCH — ` ` selects the right command in the // caller's table; group/command are VIEWS into argv. // 2. FLAGS — `--out VALUE` (value-taking) binds a VIEW of the next // token; `--verbose` (boolean) records presence; the // reserved `--json` mode flag surfaces as `parsed.json`. // 3. SEPARATORS — `--` and the first bare operand both stop flag // parsing; the remainder is `parsed.rest` (operand VIEWS). // 4. HEAP — flag values / group / command / rest all point INSIDE // the input argv (zero copy); `Parsed` is a stack value. // 5. FAILURES — unknown command, unknown flag, missing required flag, // and a value-flag with no value each raise the specific // `CliError` variant on the error channel, and the // caller-owned `Diag` names the offending token. #import "modules/std.sx"; #import "modules/std/cli.sx"; report :: (label: string, ok: bool) { if ok { print("{}: ok\n", label); } else { print("{}: FAIL\n", label); } } // Half-open containment [lo, hi) — used to prove a view points into argv. in_range :: (x: i64, lo: i64, hi: i64) -> bool { return x >= lo and x < hi; } // True when `parse(args, cmds)` raised exactly `want`. Destructure binds // the error tag without `try`, so a bad vector never aborts the example; // the failing token is captured in the caller-owned `Diag`. raises :: (args: []string, cmds: []Command, want: CliError) -> bool { d : Diag = .{}; _, e := parse(args, cmds, @d); return e == want; } main :: () -> ! { // ── Command table (caller storage; flag specs passed as views) ──── publish_flags : []FlagSpec = .[ FlagSpec.{ name = "out", takes_value = true, required = true }, FlagSpec.{ name = "verbose", takes_value = false, required = false }, ]; status_flags : []FlagSpec = .[ FlagSpec.{ name = "verbose", takes_value = false, required = false }, ]; cmds : []Command = .[ Command.{ group = "ci", command = "publish", flags = publish_flags }, Command.{ group = "ci", command = "status", flags = status_flags }, ]; // ── 1. Valid: --flag v --bool --json ─────────── d : Diag = .{}; argv : []string = .["ci", "publish", "--out", "dist", "--verbose", "--json"]; p := try parse(argv, cmds, @d); report("dispatch-group", p.group == "ci"); report("dispatch-command", p.command == "publish"); report("dispatch-index", p.cmd_index == 0); report("flag-value", p.value_of("out") == "dist"); report("flag-value-set", p.is_set("out")); report("bool-set", p.is_set("verbose")); report("json-set", p.json); report("no-rest", p.rest.len == 0); // ── 2. Heap discipline: flag value is a VIEW into argv ──────────── // "dist" is argv[3]; its bytes must lie inside that very element. src : i64 = xx argv[3].ptr; stop := src + argv[3].len; pview : i64 = xx p.value_of("out").ptr; report("value-is-view", in_range(pview, src, stop) or pview == src); // group/command are argv[0]/argv[1] verbatim (same pointer, no copy). g0 : i64 = xx argv[0].ptr; gp : i64 = xx p.group.ptr; report("group-is-view", gp == g0); // ── 3. Dispatch to a different command in the table ────────────── s_argv : []string = .["ci", "status", "--verbose"]; sp := try parse(s_argv, cmds, @d); report("dispatch-2nd", sp.command == "status" and sp.cmd_index == 1); report("2nd-bool", sp.is_set("verbose")); report("2nd-json-unset", !sp.json); // ── 4. `--` separator: rest are operand views, flags stop there ── sep_argv : []string = .["ci", "publish", "--out", "dist", "--", "--raw", "x"]; spv := try parse(sep_argv, cmds, @d); report("sep-value", spv.value_of("out") == "dist"); report("sep-rest-len", spv.rest.len == 2); report("sep-rest-0", spv.rest.len == 2 and spv.rest[0] == "--raw"); report("sep-rest-1", spv.rest.len == 2 and spv.rest[1] == "x"); report("sep-no-bool", !spv.is_set("verbose")); // ── 5. First bare operand also stops flag parsing ──────────────── bare_argv : []string = .["ci", "publish", "--out", "dist", "extra", "tail"]; bpv := try parse(bare_argv, cmds, @d); report("bare-rest-len", bpv.rest.len == 2); report("bare-rest-0", bpv.rest.len == 2 and bpv.rest[0] == "extra"); // ── 6. Value-flag accepts a single-dash value (not a long flag) ── dash_argv : []string = .["ci", "publish", "--out", "-5", "--verbose"]; dpv := try parse(dash_argv, cmds, @d); report("dash-value", dpv.value_of("out") == "-5" and dpv.is_set("verbose")); // ── 7. Failures: each surfaces the specific variant ────────────── a_zero_args : []string = .[]; // nothing at all a_unknown_cmd : []string = .["ci", "deploy", "--out", "x"]; a_unknown_group : []string = .["zz", "publish", "--out", "x"]; a_too_few : []string = .["ci"]; a_unknown_flag : []string = .["ci", "publish", "--out", "x", "--nope"]; a_missing_value : []string = .["ci", "publish", "--out"]; a_value_eats : []string = .["ci", "publish", "--out", "--verbose"]; a_missing_req : []string = .["ci", "publish", "--verbose"]; // A command whose FlagSpec list exceeds the inline `Parsed.values` cap // (16): the parser rejects it with TooManyFlags rather than silently // truncating. 17 specs (> 16) trips the check right after dispatch // matches (group, command), before any flag is read. over_flags : []FlagSpec = .[ FlagSpec.{ name = "f00", takes_value = false, required = false }, FlagSpec.{ name = "f01", takes_value = false, required = false }, FlagSpec.{ name = "f02", takes_value = false, required = false }, FlagSpec.{ name = "f03", takes_value = false, required = false }, FlagSpec.{ name = "f04", takes_value = false, required = false }, FlagSpec.{ name = "f05", takes_value = false, required = false }, FlagSpec.{ name = "f06", takes_value = false, required = false }, FlagSpec.{ name = "f07", takes_value = false, required = false }, FlagSpec.{ name = "f08", takes_value = false, required = false }, FlagSpec.{ name = "f09", takes_value = false, required = false }, FlagSpec.{ name = "f10", takes_value = false, required = false }, FlagSpec.{ name = "f11", takes_value = false, required = false }, FlagSpec.{ name = "f12", takes_value = false, required = false }, FlagSpec.{ name = "f13", takes_value = false, required = false }, FlagSpec.{ name = "f14", takes_value = false, required = false }, FlagSpec.{ name = "f15", takes_value = false, required = false }, FlagSpec.{ name = "f16", takes_value = false, required = false }, ]; over_cmds : []Command = .[ Command.{ group = "big", command = "cmd", flags = over_flags } ]; over_args : []string = .["big", "cmd"]; report("err-zero-args", raises(a_zero_args, cmds, error.UnknownCommand)); report("err-unknown-cmd", raises(a_unknown_cmd, cmds, error.UnknownCommand)); report("err-unknown-group", raises(a_unknown_group, cmds, error.UnknownCommand)); report("err-too-few", raises(a_too_few, cmds, error.UnknownCommand)); report("err-unknown-flag", raises(a_unknown_flag, cmds, error.UnknownFlag)); report("err-missing-value", raises(a_missing_value, cmds, error.MissingValue)); report("err-value-eats-flag", raises(a_value_eats, cmds, error.MissingValue)); report("err-missing-req", raises(a_missing_req, cmds, error.MissingRequired)); report("err-too-many-flags", raises(over_args, over_cmds, error.TooManyFlags)); // ── 8. Diag pins the offending (token, index) for EVERY raise site ─ // Each failure records the exact offending token (a VIEW into `args`, // except missing-required / too-many which name the spec's flag / the // command) plus its `args` index, so a caller can report which token // failed. This covers ALL SIX raise sites in cli.sx, both UnknownCommand // sub-branches included: // - zero-arg -> index -1, token "" (args.len == 0) // - too-few -> index 0, token args[0] (args.len == 1) // - unknown pair -> index 1, token command (group OR command wrong) // - too-many -> index -1, token command (spec count > 16 cap) // - unknown flag -> index i, token flag tok // - missing val -> index i, token flag tok // - missing req -> index -1, token flag name // The three index==-1 cases (zero-arg, too-many, missing-req) COINCIDE // with `Diag`'s `.{}` defaults (index -1, token ""), so those Diags are // seeded with a sentinel first: the assertion then proves `parse` // actually WROTE the value, not that it merely left the default. de : Diag = .{}; _, ue := parse(a_unknown_flag, cmds, @de); report("diag-flag-tag", ue == error.UnknownFlag); report("diag-flag-token", de.token == "--nope" and de.index == 4); dc : Diag = .{}; _, ce := parse(a_unknown_cmd, cmds, @dc); report("diag-cmd-tag", ce == error.UnknownCommand); report("diag-cmd-token", dc.token == "deploy" and dc.index == 1); dg : Diag = .{}; _, ge := parse(a_unknown_group, cmds, @dg); report("diag-group-tag", ge == error.UnknownCommand); report("diag-group-token", dg.token == "publish" and dg.index == 1); df : Diag = .{}; _, fe := parse(a_too_few, cmds, @df); report("diag-too-few-tag", fe == error.UnknownCommand); report("diag-too-few-token", df.token == "ci" and df.index == 0); d0 : Diag = .{ index = 999, token = "" }; // sentinel: -1/"" are defaults _, z0e := parse(a_zero_args, cmds, @d0); report("diag-zero-args-tag", z0e == error.UnknownCommand); report("diag-zero-args-token", d0.token == "" and d0.index == -1); dv : Diag = .{}; _, ve := parse(a_missing_value, cmds, @dv); report("diag-missing-value-tag", ve == error.MissingValue); report("diag-missing-value-token", dv.token == "--out" and dv.index == 2); dz : Diag = .{}; _, ze := parse(a_value_eats, cmds, @dz); report("diag-value-eats-tag", ze == error.MissingValue); report("diag-value-eats-token", dz.token == "--out" and dz.index == 2); dm : Diag = .{ index = 999, token = "" }; // sentinel: -1 is the default _, me := parse(a_missing_req, cmds, @dm); report("diag-req-tag", me == error.MissingRequired); report("diag-req-token", dm.token == "out"); report("diag-req-index", dm.index == -1); dt : Diag = .{ index = 999, token = "" }; // sentinel: -1 is the default _, te := parse(over_args, over_cmds, @dt); report("diag-too-many-tag", te == error.TooManyFlags); report("diag-too-many-token", dt.token == "cmd" and dt.index == -1); print("=== DONE ===\n"); return; }