Defining the link construct.

§1.

enum LINK_IST

void Inter::Link::define?Usage of Inter::Link::define:
Definition - §3(void) {
    inter_construct *IC = Inter::Defn::create_construct(
        LINK_IST,
        L"link (%i+) \"(%c*)\" \"(%c*)\" \"(%c*)\" \"(%c*)\"",
        I"link", I"links");
    METHOD_ADD(IC, CONSTRUCT_READ_MTID, Inter::Link::read);
    METHOD_ADD(IC, CONSTRUCT_TRANSPOSE_MTID, Inter::Link::transpose);
    METHOD_ADD(IC, CONSTRUCT_VERIFY_MTID, Inter::Link::verify);
    METHOD_ADD(IC, CONSTRUCT_WRITE_MTID, Inter::Link::write);
}

§2.

define STAGE_LINK_IFLD 2
define SEGMENT_LINK_IFLD 3
define PART_LINK_IFLD 4
define TO_RAW_LINK_IFLD 5
define TO_SEGMENT_LINK_IFLD 6
define REF_LINK_IFLD 7
define EXTENT_LINK_IFR 8
define EARLY_LINK_STAGE 1
define BEFORE_LINK_STAGE 2
define INSTEAD_LINK_STAGE 3
define AFTER_LINK_STAGE 4
define CATCH_ALL_LINK_STAGE 5

void Inter::Link::read?Usage of Inter::Link::read:
§1(inter_construct *IC, inter_bookmark *IBM, inter_line_parse *ilp, inter_error_location *eloc, inter_error_message **E) {
    *E = Inter::Defn::vet_level(IBM, LINK_IST, ilp->indent_level, eloc);
    if (*E) return;

    if (Inter::Annotations::exist(&(ilp->set))) { *E = Inter::Errors::plain(I"__annotations are not allowed", eloc); return; }

    inter_ti stage = 0;
    text_stream *stage_text = ilp->mr.exp[0];
    if (Str::eq(stage_text, I"early")) stage = EARLY_LINK_STAGE;
    else if (Str::eq(stage_text, I"before")) stage = BEFORE_LINK_STAGE;
    else if (Str::eq(stage_text, I"instead")) stage = INSTEAD_LINK_STAGE;
    else if (Str::eq(stage_text, I"after")) stage = AFTER_LINK_STAGE;
    else { *E = Inter::Errors::plain(I"no such stage name is supported", eloc); return; }

    inter_ti SIDS[5];
    SIDS[0] = stage;
    for (int i=1; i<=4; i++) {
        SIDS[i] = Inter::Warehouse::create_text(Inter::Bookmarks::warehouse(IBM), Inter::Bookmarks::package(IBM));
        *E = Inter::Constant::parse_text(Inter::Warehouse::get_text(Inter::Bookmarks::warehouse(IBM), SIDS[i]), ilp->mr.exp[i], 0, Str::len(ilp->mr.exp[i]), eloc);
        if (*E) return;
    }

    *E = Inter::Link::new(IBM, SIDS[0], SIDS[1], SIDS[2], SIDS[3], SIDS[4], 0, (inter_ti) ilp->indent_level, eloc);
}

inter_error_message *Inter::Link::new(inter_bookmark *IBM,
    inter_ti stage, inter_ti text1, inter_ti text2, inter_ti text3, inter_ti text4, inter_ti ref, inter_ti level,
    struct inter_error_location *eloc) {
    inter_tree_node *P = Inode::fill_6(IBM, LINK_IST, stage, text1, text2, text3, text4, ref, eloc, level);
    inter_error_message *E = Inter::Defn::verify_construct(Inter::Bookmarks::package(IBM), P); if (E) return E;
    Inter::Bookmarks::insert(IBM, P);
    return NULL;
}

void Inter::Link::transpose?Usage of Inter::Link::transpose:
§1(inter_construct *IC, inter_tree_node *P, inter_ti *grid, inter_ti grid_extent, inter_error_message **E) {
    for (int i=SEGMENT_LINK_IFLD; i<=TO_SEGMENT_LINK_IFLD; i++)
        P->W.data[i] = grid[P->W.data[i]];
}

void Inter::Link::verify?Usage of Inter::Link::verify:
§1(inter_construct *IC, inter_tree_node *P, inter_package *owner, inter_error_message **E) {
    if (P->W.extent != EXTENT_LINK_IFR) { *E = Inode::error(P, I"extent wrong", NULL); return; }

    if ((P->W.data[STAGE_LINK_IFLD] != EARLY_LINK_STAGE) &&
        (P->W.data[STAGE_LINK_IFLD] != BEFORE_LINK_STAGE) &&
        (P->W.data[STAGE_LINK_IFLD] != INSTEAD_LINK_STAGE) &&
        (P->W.data[STAGE_LINK_IFLD] != AFTER_LINK_STAGE))
        { *E = Inode::error(P, I"bad stage marker on link", NULL); return; }
    if (P->W.data[SEGMENT_LINK_IFLD] == 0) { *E = Inode::error(P, I"no segment text", NULL); return; }
    if (P->W.data[PART_LINK_IFLD] == 0) { *E = Inode::error(P, I"no part text", NULL); return; }
    if (P->W.data[TO_RAW_LINK_IFLD] == 0) { *E = Inode::error(P, I"no to-raw text", NULL); return; }
    if (P->W.data[TO_SEGMENT_LINK_IFLD] == 0) { *E = Inode::error(P, I"no to-segment text", NULL); return; }
}

void Inter::Link::write?Usage of Inter::Link::write:
§1(inter_construct *IC, OUTPUT_STREAM, inter_tree_node *P, inter_error_message **E) {
    WRITE("link ");
    switch (P->W.data[STAGE_LINK_IFLD]) {
        case EARLY_LINK_STAGE: WRITE("early"); break;
        case BEFORE_LINK_STAGE: WRITE("before"); break;
        case INSTEAD_LINK_STAGE: WRITE("instead"); break;
        case AFTER_LINK_STAGE: WRITE("after"); break;
    }
    for (int i=SEGMENT_LINK_IFLD; i<=TO_SEGMENT_LINK_IFLD; i++) {
        WRITE(" \"");
        text_stream *S = Inode::ID_to_text(P, P->W.data[i]);
        Inter::Constant::write_text(OUT, S);
        WRITE("\"");
    }
}