func (gb *GolangBackend) compileLambdaApplication(nl *gol.NodeLambda, vals *gol.NodeList) (string, error) {
bindings := make(map[string]gol.Node)
args := nl.Args
if args.Len() != vals.Len() {
return "", fmt.Errorf("Wrong number of args for lambda. [%s] != [%s]",
args.String(), vals.String())
}
for vals.Len() > 0 {
id := args.First().String()
bindings[id] = vals.First()
vals = vals.Rest()
args = args.Rest()
}
letForLambda := &gol.NodeLet{
// NodeList: nl.NodeList,
Bindings: bindings,
Body: nl.Body,
}
lambdaVarType, ok := nl.Type().(*typ.Var)
if !ok {
// Not an error if it's a functype, but we assign vars to all nodes....
return "", fmt.Errorf("Odd - not a var, instead a %T: %s\n", nl.Type(), nl.Type())
}
lambdaType, err := lambdaVarType.Lookup()
if err != nil {
return "", fmt.Errorf("Can't look up lambda var: %s [%T]\n", lambdaVarType, lambdaVarType)
}
funcType, ok := lambdaType.(typ.Func)
if !ok {
return "", fmt.Errorf("Lambda doesn't have function type: %s [%T]\n", nl.Type(), nl.Type())
}
letForLambda.NodeList = gol.NewNodeListType(funcType.Result)
return gb.compileLet(letForLambda)
}
func (gb *GolangBackend) compileAnonOrNamedLambda(nl *gol.NodeLambda, name string) (string, error) {
lambdaType, err := typ.Resolve(nl.Type())
if err != nil {
return "", fmt.Errorf("Can't resolve lambda var: %s [%T]\n", lambdaType, lambdaType)
}
funcType, ok := lambdaType.(typ.Func)
if !ok {
return "", fmt.Errorf("Lambda doesn't have function type: %s [%T]\n", nl.Type(), nl.Type())
}
if nl.Args.Len() != len(funcType.Args) {
return "", fmt.Errorf("Arg/type mismatch: %d != %d\n", nl.Args.Len(), len(funcType.Args))
}
i := 0
strArgs := make([]string, len(funcType.Args))
err = nl.Args.Foreach(func(child gol.Node) error {
golangType, err := golangStringForType(funcType.Args[i])
if err != nil {
return err
}
id := child.String()
strArgs[i] = fmt.Sprintf("%s %s", mangleIdentifier(id), golangType)
i++
return nil
})
if err != nil {
return "", err
}
golangRetType, err := golangStringForType(funcType.Result)
if err != nil {
return "", err
}
s := fmt.Sprintf("func %s(%s) %s {", mangleIdentifier(name), strings.Join(strArgs, ", "), golangRetType)
body, err := gb.compile(nl.Body)
if err != nil {
return "", err
}
s += "return " + body
s += "}"
return s, nil
}