Function py_split_subscript_args

internal/cbm/lsp/py_lsp.c:2760–2805

Split a comma-separated argument string at depth 0 (ignoring commas * inside [], (), {}). Returns NULL-terminated arena array of trimmed * substring copies. Caller passes the inside of `[...]`. */

 * inside [], (), {}). Returns NULL-terminated arena array of trimmed
 * substring copies. Caller passes the inside of `[...]`. */
static const char **py_split_subscript_args(CBMArena *arena, const char *s, int *out_n) {
    if (!s) {
        *out_n = 0;
        return NULL;
    }
    int cap = 8;
    const char **out =
        (const char **)cbm_arena_alloc(arena, (size_t)(cap + 1) * sizeof(const char *));
    if (!out) {
        *out_n = 0;
        return NULL;
    }
    int n = 0;
    int depth = 0;
    size_t len = strlen(s);
    size_t start = 0;
    for (size_t i = 0; i <= len; i++) {
        char c = (i < len) ? s[i] : ',';
        if (c == '[' || c == '(' || c == '{')
            depth++;
        else if (c == ']' || c == ')' || c == '}')
            depth--;
        else if (c == ',' && depth == 0) {
            char *part = py_trim_ws(arena, s + start, i - start);
            if (part && part[0]) {
                if (n >= cap) {
                    int new_cap = cap * 2;
                    const char **grown = (const char **)cbm_arena_alloc(
                        arena, (size_t)(new_cap + 1) * sizeof(const char *));
                    if (grown) {
                        for (int q = 0; q < n; q++)
                            grown[q] = out[q];
                        out = grown;
                        cap = new_cap;
                    }
                }
                if (n < cap)
                    out[n++] = part;
            }
            start = i + 1;
        }
    }
    out[n] = NULL;
    *out_n = n;
    return out;
}

static const CBMType *py_parse_type_text_qn(CBMArena *arena, const char *ann,
                                            const char *module_qn) {