69 lines
2.3 KiB
Text
69 lines
2.3 KiB
Text
# attrs_node.ludic — @Node(model): a string naming a node inside the glTF another field of the same
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# record names. That field is @Asset("gltf") itself, or an @Ref(R) whose record has exactly one
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# @Asset("gltf") field (the model is found through the row). Anything else is an error naming it.
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# the field of record d called name, or null
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function at_field_of(d: Node, name: pointer) -> Node {
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var k = 0
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while k < len(d.kids) {
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if d.kids[k].s != null and vis_plain(d.kids[k].s) == name { return d.kids[k] }
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k += 1
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}
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return null
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}
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# field f's argument to attribute a as written, or null when f does not carry it
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function at_arg_of(f: Node, a: pointer) -> pointer {
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if f.at < 0 { return null }
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var j = g_at_start[f.at]
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while j < g_at_start[f.at] + g_at_count[f.at] {
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if g_at_name[j] == a { return g_at_first[j] }
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j += 1
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}
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return null
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}
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function at_is_gltf(f: Node) -> bool {
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let a = at_arg_of(f, "Asset")
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return a != null and a == "gltf"
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}
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# the record called name (a property or record), or null
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function at_record(name: pointer) -> Node {
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let plain = vis_plain(name)
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var i = 0
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while i < len(prog) {
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if prog[i].kind == N_COMP and prog[i].s != null and vis_plain(prog[i].s) == plain { return prog[i] }
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i += 1
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}
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return null
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}
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# how many @Asset("gltf") fields record r carries
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function at_gltf_count(r: Node) -> int {
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var n = 0
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var k = 0
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while k < len(r.kids) {
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if at_is_gltf(r.kids[k]) { n += 1 }
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k += 1
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}
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return n
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}
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function at_check_node(d: Node, f: Node, target: pointer) -> void {
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let where = `field {d.s}.{f.s}: @Node({target})`
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let t = at_field_of(d, target)
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if t == null {
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perr_at(f.file, f.line, f.col, `{where} names no field - {d.s} has no field {target}`)
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return
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}
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if at_is_gltf(t) { return }
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let reg = at_arg_of(t, "Ref")
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if reg == null {
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perr_at(f.file, f.line, f.col, `{where}: {target} is neither @Asset("gltf") nor an @Ref to a registry of models`)
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return
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}
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let r = reg_find(reg)
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if r < 0 { return } # @Ref's own check says so
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let rec = at_record(g_rg_type[r])
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var n = 0
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if rec != null { n = at_gltf_count(rec) }
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if n != 1 {
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perr_at(f.file, f.line, f.col, `{where}: {target} is an @Ref({reg}), and its record {g_rg_type[r]} has {n} @Asset("gltf") fields, not one`)
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}
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}
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