func phelp(t xc.Token) string {
if len(t.S()) != 0 {
return fmt.Sprintf(" %s", t.S())
}
return ""
}
func (l *lexer) mustIdent(t xc.Token) (Node, int) {
b, f := l.scope.lookup(t.Val)
if b == nil {
l.report.ErrTok(t, "undeclared identifier %s", t.S())
return nil, -1
}
return b.Node, f
}
func (l *lexer) mustProc(t xc.Token) (Node, int) {
n, f := l.mustIdent(t)
if n == nil {
return nil, -1
}
if _, ok := n.(*ProcSpec); !ok {
l.report.ErrTok(t, "%s is not a procedure", t.S())
return nil, -1
}
return n, f
}
func (l *lexer) mustVar(t xc.Token) (Node, int) {
n, f := l.mustIdent(t)
if n == nil {
return nil, -1
}
if _, ok := n.(*Variable); !ok {
l.report.ErrTok(t, "%s is not a variable", t.S())
return nil, -1
}
return n, f
}
func (l *lexer) mustVarOrConst(t xc.Token) (Node, int) {
n, f := l.mustIdent(t)
if n == nil {
return nil, -1
}
switch n.(type) {
case *Variable, *ConstSpec:
return n, f
default:
l.report.ErrTok(t, "%s is not a constant or a variable", t.S())
return nil, -1
}
}
// Bind attempts to bind the name in t to node. Errors are reported to report.
func (b *Bindings) Bind(t xc.Token, node Node, report *xc.Report) {
nm := t.Val
if x := b.Map[nm]; x != nil {
ok := false
switch e := x.Node.(type) {
case *ConstSpec, *Variable:
case *ProcSpec:
ok = e == nil
default:
panic("internal error")
}
if !ok {
report.ErrTok(t, "redeclaration of %s at %s", xc.Dict.S(nm), position(x.Pos))
return
}
}
b.Map[nm] = &Binding{node, t.Pos()}
}