attributes: @Clip(field) resolved as @Node is, and @OneOf takes constants as well as a prefix - one argument ending in _ is a prefix, otherwise each is a constant that must exist; reseeded

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

LANGUAGE.md

@@ -636,10 +636,12 @@ the lines above it:
 property Tool {
   @Ref(Vendors) seller: int = 0            # an index into that registry: its entries are offered
   @OneOf(GR_) grade: int = 0               # one of the constants whose names start GR_
+  @OneOf(GR_GOLD, GR_SILVER) medal: int = 0 # or one of these constants
   @Range(0, 20.5) @Unit("kg") weight: float = 1.0
   @Asset("gltf") model: string = ""        # a file of that kind (any string)
   @Color tint: int = 0
   @Node(model) grip: string = ""           # a node inside the glTF that `model` names
+  @Clip(model) swing: string = ""          # a clip inside it
   @Derived reach: float = 0.0              # worked out at boot: anything written is overwritten
   @Text @Multiline blurb: string = ""      # read by the player (so translated), and prose
   @Key bind: int = 0                       # a key code
@@ -648,8 +650,10 @@ property Tool {
 registry Tools of Tool as TL from "data/tools.lres"
 ```
 
-They change nothing the program does. Two are checked, and every field that fails is reported, not
-only the first: `@Ref` must name a registry the program declares, and `@Node(f)` must name a field
+They change nothing the program does. Three are checked, and every field that fails is reported, not
+only the first: `@Ref` must name a registry the program declares; `@OneOf` with one argument ending
+in `_` is a prefix, and otherwise each argument is a constant that must exist; and `@Node(f)` or
+`@Clip(f)` must name a field
 `f` of the same record that is either `@Asset("gltf")` or an `@Ref` to a registry whose record has
 exactly one `@Asset("gltf")` field (the model is then the referenced row's).
 

changes/editor-schema.md

@@ -8,8 +8,9 @@ prefix, resource file, openness and its entries in their final order after the o
 which entries in); every const; and every function a `fn` value can name, with the `fn_type` a field sees (its states stripped).
 Deterministic, `"schema_version": 1`. Fields and registries carry editor attributes on the existing
 `@` syntax - `@Ref(Registry)`, `@OneOf(PREFIX_)`, `@Range(lo, hi)`, `@Unit("m/s")`, `@Asset("gltf")`,
-`@Color`, `@Node(field)`, `@Derived`, `@Text`, `@Multiline`, `@Key`, and `@AppendOnly` / `@ByKey` on
+`@Color`, `@Node(field)`, `@Clip(field)`, `@Derived`, `@Text`, `@Multiline`, `@Key`, and `@AppendOnly` / `@ByKey` on
 a registry - which change nothing but go into the schema; `@Ref` naming no registry is an error, and
-so is `@Node` naming a field that is not a glTF (`@Asset("gltf")`, or an `@Ref` to one). A field may now carry several attributes. `ludicc --check
+so is `@Node` / `@Clip` naming a field that is not a glTF (`@Asset("gltf")`, or an `@Ref` to one), and
+a listing `@OneOf` (`@OneOf(A, B)`, not a prefix `@OneOf(P_)`) naming a constant that does not exist. A field may now carry several attributes. `ludicc --check
 --diagnostics=json` (`ludic build --check --diagnostics=json`) prints every error as one JSON array
 of `{file, line, col, severity, message}` on stdout; tokens and nodes now know their column.

examples/lang/attributes.ludic

@@ -30,6 +30,8 @@ program Attributes {
     @Derived reach: float = 0.0                # worked out at boot from the model
     @Text @Multiline blurb: string = ""        # what the shop says about it
     @Key bind: int = 0                         # the key that takes it in hand
+    @Clip(model) swing: string = "swing"       # the clip it plays in use
+    @OneOf(VD_STORE, VD_MARINA) sold_at: int = VD_MARINA
   }
   @AppendOnly
   registry Tools of Tool as TL from "data/attr_tools.lres"

examples/rejected/node_bad.ludic

@@ -1,5 +1,6 @@
-# attributes: @Node names a field of its record that names a glTF - `handle` names no field, `tag`
-# is a plain string, and `kit` refers to a registry whose record has two models (all three are reported)
+# attributes: @Node / @Clip name a field of its record that names a glTF - `handle` names no field,
+# `tag` is a plain string, `kit` refers to a registry whose record has two models - and a listing
+# @OneOf names constants that exist, which KITS_NONE is not (all five are reported)
 program R {
   property Kit {
     key: string = ""
@@ -13,6 +14,8 @@ program R {
     @Node(handle) grip: string = ""
     @Node(tag) tip: string = ""
     @Node(kit) hook: string = ""
+    @Clip(tag) swing: string = ""
+    @OneOf(KITS_COUNT, KITS_NONE) which: int = 0
   }
   entry { print(KITS_COUNT) }
 }

selfhost/frontend/attrs.ludic

@@ -3,20 +3,23 @@
 #
 #   property Item {
 #     @Ref(Vendors) seller: int = 0            # an index into that registry (its entries are offered)
-#     @OneOf(GR_) grade: int = 0               # one of the constants that start GR_
+#     @OneOf(GR_) grade: int = 0               # one of the constants that start GR_ ...
+#     @OneOf(WILD_MEADOW, WILD_SHORE) hab: int = 0   # ... or one of these (each must exist)
 #     @Range(0, 1.5) weight: float = 0.4
 #     @Unit("m/s") speed: float = 0.0
 #     @Asset("gltf") model: string = ""        # a file of that kind
 #     @Color tint: int = 0
 #     @Node(model) grip: string = ""           # a node inside the glTF the field `model` names
+#     @Clip(model) idle: string = ""           # a clip inside that glTF
 #     @Derived reach: float = 0.0              # worked out at boot: anything written is overwritten
 #     @Text @Multiline blurb: string = ""      # read by the player, so translated; prose
 #     @Key bind: int = 0                       # a key code
 #   }
 #   @AppendOnly @ByKey registry Items of Item as IT from "items.lres"
 #
-# They change nothing the program does. Two are checked: @Ref must name a registry that exists, and
-# @Node a field of its record that names a glTF (attrs_node.ludic). A
+# They change nothing the program does. Three are checked: @Ref must name a registry that exists,
+# @Node and @Clip a field of its record that names a glTF (attrs_node.ludic), and a listing @OneOf
+# constants that exist. A
 # field's or a registry's attributes are a group (Node.at, g_rg_at): a run of names, each with its
 # arguments as JSON values - an identifier or a string as a string, a number as written.
 var g_at_start: []int = new []int            # a group's first attribute ...
@@ -47,10 +50,12 @@ function at_push(g: int, name: pointer, args: pointer, first: pointer, nargs: in
 var g_at_arg0: pointer = null
 var g_at_argn: int = 0
 var g_at_allnum: bool = true                 # every argument a number
+var g_at_allid: bool = true                  # every argument a name
 function at_args() -> pointer {
   g_at_arg0 = null
   g_at_argn = 0
   g_at_allnum = true
+  g_at_allid = true
   if not is_op("(") { return "[]" }
   pi += 1
   var out: pointer = "["
@@ -59,6 +64,7 @@ function at_args() -> pointer {
     var neg = false
     if is_op("-") { neg = true;  pi += 1 }
     let t = toks[pi]
+    if t.kind != TK_ID { g_at_allid = false }
     var v: pointer = null
     var raw: pointer = null
     if t.kind == TK_INT {
@@ -98,7 +104,7 @@ function at_lead0(raw: pointer) -> pointer {
 # the editor attributes a field may carry, and what each takes
 function at_field_known(a: pointer) -> bool {
   if (a == "Ref") or (a == "OneOf") or (a == "Range") or (a == "Unit") or (a == "Asset") or (a == "Color") { return true }
-  return (a == "Node") or at_flag(a)
+  return (a == "Node") or (a == "Clip") or at_flag(a)
 }
 # the attributes that take nothing: they say what a field is
 function at_flag(a: pointer) -> bool {
@@ -108,9 +114,10 @@ function at_flag(a: pointer) -> bool {
 function at_field(g: int, a: pointer) -> void {
   let args = at_args()
   let n = g_at_argn
-  if (a == "Ref") or (a == "OneOf") or (a == "Node") {
+  if (a == "Ref") or (a == "Node") or (a == "Clip") {
     if n != 1 or toks[pi - 2].kind != TK_ID { perr(`@{a} takes one name: @{a}(Items)`) }
   }
+  if (a == "OneOf") and (n < 1 or not g_at_allid) { perr("@OneOf takes a prefix or constants: @OneOf(GR_) or @OneOf(GR_GOLD, GR_SILVER)") }
   if (a == "Range") and n != 2 { perr("@Range takes the least and the most: @Range(0, 1.5)") }
   if (a == "Range") and not g_at_allnum { perr("@Range takes two numbers: @Range(0, 1.5)") }
   if ((a == "Unit") or (a == "Asset")) and (n != 1 or toks[pi - 2].kind != TK_STR) { perr(`@{a} takes one string: @{a}("m/s")`) }
@@ -145,7 +152,8 @@ function at_registry_take() -> int {
   g_at_decl = new []pointer
   return g
 }
-# once every registry is declared: each @Ref names one and each @Node a glTF field, or the build
+# once every registry is declared: each @Ref names one, each @Node / @Clip a glTF field and a
+# listing @OneOf constants that exist, or the build
 # stops with every one that does not
 function at_check_refs() -> void {
   var i = 0
@@ -170,7 +178,8 @@ function at_check_field(d: Node, f: Node) -> void {
     if (g_at_name[j] == "Ref") and reg_find(g_at_first[j]) < 0 {
       perr_at(f.file, f.line, f.col, `field {d.s}.{f.s}: @Ref({g_at_first[j]}) names no registry - there is no registry {g_at_first[j]}`)
     }
-    if g_at_name[j] == "Node" { at_check_node(d, f, g_at_first[j]) }
+    if (g_at_name[j] == "Node") or (g_at_name[j] == "Clip") { at_check_node(d, f, g_at_name[j], g_at_first[j]) }
+    if g_at_name[j] == "OneOf" { at_check_oneof(d, f, j) }
     j += 1
   }
 }

selfhost/frontend/attrs_node.ludic

@@ -1,5 +1,5 @@
-# attrs_node.ludic — @Node(model): a string naming a node inside the glTF another field of the same
-# record names. That field is @Asset("gltf") itself, or an @Ref(R) whose record has exactly one
+# attrs_node.ludic — @Node(model) / @Clip(model): a string naming a node or a clip inside the glTF
+# another field of the same record names. That field is @Asset("gltf") itself, or an @Ref(R) whose record has exactly one
 # @Asset("gltf") field (the model is found through the row). Anything else is an error naming it.
 
 # the field of record d called name, or null
@@ -45,8 +45,8 @@ function at_gltf_count(r: Node) -> int {
   }
   return n
 }
-function at_check_node(d: Node, f: Node, target: pointer) -> void {
-  let where = `field {d.s}.{f.s}: @Node({target})`
+function at_check_node(d: Node, f: Node, a: pointer, target: pointer) -> void {
+  let where = `field {d.s}.{f.s}: @{a}({target})`
   let t = at_field_of(d, target)
   if t == null {
     perr_at(f.file, f.line, f.col, `{where} names no field - {d.s} has no field {target}`)
@@ -67,3 +67,41 @@ function at_check_node(d: Node, f: Node, target: pointer) -> void {
     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`)
   }
 }
+
+# @OneOf: one argument ending in _ is a prefix; otherwise every argument is a constant that must exist
+function at_check_oneof(d: Node, f: Node, j: int) -> void {
+  let first = g_at_first[j]
+  if g_at_nargs[j] == 1 and first[len(first) - 1] == '_' { return }
+  let names = at_arg_names(g_at_args[j])
+  var i = 0
+  while i < len(names) {
+    if not at_const_exists(names[i]) {
+      perr_at(f.file, f.line, f.col, `field {d.s}.{f.s}: @OneOf names {names[i]}, and there is no constant {names[i]}`)
+    }
+    i += 1
+  }
+}
+# the names in an attribute's JSON arguments (["A", "B"]): each a quoted identifier
+function at_arg_names(args: pointer) -> []pointer {
+  let out = new []pointer
+  var i = 0
+  var at = -1
+  while i < len(args) {
+    if args[i] == '"' {
+      if at < 0 { at = i + 1 } else {
+        push(out, args[at .. i])
+        at = -1
+      }
+    }
+    i += 1
+  }
+  return out
+}
+function at_const_exists(name: pointer) -> bool {
+  var i = 0
+  while i < len(prog) {
+    if prog[i].kind == N_CONST and prog[i].s != null and vis_plain(prog[i].s) == name { return true }
+    i += 1
+  }
+  return false
+}

tools/ludic-cli/test.ludic

@@ -1200,7 +1200,7 @@ function cmd_dev_test() -> int {
   reject_count("rejected/every_error", 3, "every type error in a program is reported at once, not only the first")
   diag_json_case("rejected/every_error", 3, "\"line\": 8, \"col\": 15, \"severity\": \"error\", \"message\": \"half takes 1 argument(s) and this call gives 2\"", "--diagnostics=json: every type error as {file, line, col, severity, message}")
   diag_json_case("rejected/ref_unknown", 2, "@Ref(Shops) names no registry", "--diagnostics=json: every @Ref that names no registry")
-  diag_json_case("rejected/node_bad", 3, "its record Kit has 2 @Asset(", "--diagnostics=json: every @Node that names no model field")
+  diag_json_case("rejected/node_bad", 5, "@OneOf names KITS_NONE, and there is no constant KITS_NONE", "--diagnostics=json: every @Node / @Clip that names no model field, and every @OneOf constant that does not exist")
   feat_case("lang/generics", "", "7 Crater Lake a 2 west 7 0.75 2.5 1", "generics.ludic (L5: generic records and functions, nested instances, fn-typed parameters and fields, inference from the result's slot)")
   reject_case("rejected/generic_unbound", "cannot tell what T is in this call to pool_new", "a call whose type arguments nothing decides is refused")
   reject_case("rejected/generic_mismatch", "words wants a Pool<string> and this is a Pool<int>", "two instances of one generic are two types")