expr/operand-const.go

34 lines
768 B
Go

// Copyright (c) 2024 Celestino Amoroso (celestino.amoroso@gmail.com).
// All rights reserved.
// operand-const.go
package expr
// -------- const term
func newConstTerm(tk *Token) *term {
return &term{
tk: *tk,
parent: nil,
children: nil,
position: posLeaf,
priority: priValue,
evalFunc: evalConst,
}
}
// -------- eval func
func evalConst(ctx ExprContext, self *term) (v any, err error) {
v = self.tk.Value
return
}
// init
func init() {
registerTermConstructor(SymString, newConstTerm)
registerTermConstructor(SymInteger, newConstTerm)
registerTermConstructor(SymFloat, newConstTerm)
registerTermConstructor(SymFraction, newConstTerm)
registerTermConstructor(SymBool, newConstTerm)
registerTermConstructor(SymKwNil, newConstTerm)
}