Function cbm_sem_proximity

src/semantic/semantic.c:1519–1553

/* ── Combined scoring ────────────────────────────────────────────── */

float cbm_sem_proximity(const char *path_a, const char *path_b) {
    if (!path_a || !path_b) {
        return CBM_SEM_UNIT_POS;
    }
    /* Count shared directory components */
    int shared = 0;
    int total_a = 0;
    int total_b = 0;
    const char *a = path_a;
    const char *b = path_b;
    while (*a && *b && *a == *b) {
        if (*a == '/') {
            shared++;
        }
        a++;
        b++;
    }
    for (const char *p = path_a; *p; p++) {
        if (*p == '/') {
            total_a++;
        }
    }
    for (const char *p = path_b; *p; p++) {
        if (*p == '/') {
            total_b++;
        }
    }
    int max_total = total_a > total_b ? total_a : total_b;
    if (max_total == 0) {
        return CBM_SEM_UNIT_POS;
    }
    float ratio = (float)shared / (float)max_total;
    /* Same file = 1.10, same dir = 1.05, distant = 1.00 */
    return CBM_SEM_UNIT_POS + (ratio * CBM_SEM_PROX_MAX_BOOST);
}

/* Cosine similarity for small float arrays (AST profile). */
static float small_cosine(const float *a, const float *b, int dims) {