cond

package

v0.2.0 Latest Latest Go to latest Published: May 31, 2023 License: EUPL-1.2 Imports: 4 Imported by: 1

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Package cond provides some special/builtin functions to conditionally evaluate values.

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func BeginS(eng *eval.Engine, env sxpf.Environment, args *sxpf.List) (eval.Expr, error)

BeginS parses a begin-statement: (begin expr...).

func IfS(eng *eval.Engine, env sxpf.Environment, args *sxpf.List) (eval.Expr, error)

IfS parses an if-statement: (if cond then else). If else is missing, a nil is assumed.

type BeginExpr struct {
	Front []eval.Expr // all expressions, but the last
	Last  eval.Expr
}

BeginExpr represents the begin form.

func (be *BeginExpr) Compute(eng *eval.Engine, env sxpf.Environment) (sxpf.Object, error)

type IfExpr struct {
	Test  eval.Expr
	True  eval.Expr
	False eval.Expr
}

IfExpr represents the if-then-else form.

func (ife *IfExpr) Compute(eng *eval.Engine, env sxpf.Environment) (sxpf.Object, error)