ludic/selfhost/ast.ludic

# ast.ludic — the node kinds and the single Node shape they share, plus the
# declaration tables the emitter reads. Mirrors compiler/front/ast.h + sem/.

# declarations
const N_STRUCT: int = 0
const N_FIELD:  int = 1
const N_VAR:    int = 2
const N_CONST:  int = 3
const N_FN:     int = 4
const N_PARAM:  int = 5
const N_MAIN:   int = 6
const N_BLOCK:  int = 7
const N_COMP:   int = 8
const N_SYS:    int = 9
const N_ARCH:   int = 10
const N_EXTERN: int = 11
const N_UI:     int = 12
# statements
const S_LET:      int = 10
const S_ASSIGN:   int = 11
const S_IF:       int = 12
const S_WHILE:    int = 13
const S_FOR:      int = 14
const S_RETURN:   int = 15
const S_EXPR:     int = 16
const S_BREAK:    int = 17
const S_CONTINUE: int = 18
const S_MATCH:    int = 19
const S_MARM:     int = 20
const S_QUERY:    int = 21
const S_SPAWN:    int = 22
const S_DESPAWN:  int = 23
const S_MACHINE:  int = 24
const S_STATE:    int = 25
const S_BECOME:   int = 26
# expressions
const E_INT:    int = 30
const E_STR:    int = 31
const E_BOOL:   int = 32
const E_ID:     int = 33
const E_CALL:   int = 34
const E_MEMBER: int = 35
const E_INDEX:  int = 36
const E_BIN:    int = 37
const E_UN:     int = 38
const E_NEW:    int = 39
const E_FLOAT:  int = 40
const E_REC:    int = 41
const E_FINIT:  int = 42

struct Node {
  kind: int = 0
  s:    ptr = ptr_null()      # name / operator / string / type-of-new
  ival: int = 0               # int literal, bool, flags
  ty:   ptr = ptr_null()      # declared type (let/param/field/fn/var/const)
  a:    Node                  # fixed children (meaning per kind)
  b:    Node
  c:    Node
  kids: []Node                # variadic children
  line: int = 0
}

fn node(kind: int) -> Node {
  let n = new Node
  n.kind = kind
  n.kids = new []Node
  return n
}