Function ts_nstack_init

internal/cbm/extract_node_stack.h:43–49

Initialize a stack with the given initial capacity, allocated from the * context's traversal scratch. Taking the context rather than an arena is * deliberate: it makes handing over ctx->arena, or a local alias of it, a type * error rather than a retention bug nobody notices. A context built without a * scratch falls back to ctx->arena, which is the behaviour that shipped before * #1997, so no

 * scratch falls back to ctx->arena, which is the behaviour that shipped before
 * #1997, so no caller ever gets a NULL arena and silently loses nodes. */
static inline void ts_nstack_init(TSNodeStack *s, const CBMExtractCtx *ctx, int initial_cap) {
    CBMArena *arena = ctx->scratch ? ctx->scratch : ctx->arena;
    s->scratch = arena;
    s->items = (TSNode *)cbm_arena_alloc(arena, (size_t)initial_cap * sizeof(TSNode));
    s->count = 0;
    s->cap = s->items ? initial_cap : 0;
}

/* Push a node onto the stack, growing 2x if needed. */
static inline void ts_nstack_push(TSNodeStack *s, TSNode node) {