func mustPrimary(cp *compiler, cn *parse.Compound, msg string) *parse.Primary {
p := onePrimary(cn)
if p == nil {
cp.errorpf(cn.Begin(), cn.End(), msg)
}
return p
}
// mustString musts that a Compound contains exactly one Primary of type
// Variable.
func mustString(cp *compiler, cn *parse.Compound, msg string) string {
s, ok := oneString(cn)
if !ok {
cp.errorpf(cn.Begin(), cn.End(), msg)
}
return s
}
func (s *Stylist) formHead(n *parse.Compound) {
simple, head, err := simpleCompound(n, nil)
st := styles{}
if simple {
if goodFormHead(head, s.editor) {
st = styleForGoodCommand
} else {
st = styleForBadCommand
}
} else if err != nil {
st = styleForBadCommand
}
if len(st) > 0 {
s.add(st.String(), n.Begin(), n.End())
}
}
func (cp *compiler) compoundOp(n *parse.Compound) ValuesOp {
return ValuesOp{cp.compound(n), n.Begin(), n.End()}
}
func isFormHead(compound *parse.Compound) bool {
if form, ok := compound.Parent().(*parse.Form); ok {
return form.Head == compound
}
return false
}
