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setq.go
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setq.go
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package gmnlisp
import (
"context"
)
func cmdSetq(ctx context.Context, w *World, params Node) (Node, error) {
var value Node = Null
for IsSome(params) {
var nameNode Node
var err error
nameNode, params, err = Shift(params)
if err != nil {
return nil, err
}
nameSymbol, ok := nameNode.(Symbol)
if !ok {
return nil, MakeError(ErrExpectedSymbol, nameSymbol)
}
value, params, err = w.ShiftAndEvalCar(ctx, params)
if err != nil {
return nil, err
}
if err := w.Set(nameSymbol, value); err != nil {
return value, err
}
}
return value, nil
}
func cmdPSetq(ctx context.Context, w *World, params Node) (Node, error) {
type assignT struct {
symbol Symbol
value Node
}
assignList := []*assignT{}
for IsSome(params) {
var nameNode Node
var err error
var value Node
nameNode, params, err = Shift(params)
if err != nil {
return nil, err
}
nameSymbol, ok := nameNode.(Symbol)
if !ok {
return nil, MakeError(ErrExpectedSymbol, nameSymbol)
}
value, params, err = w.ShiftAndEvalCar(ctx, params)
if err != nil {
return nil, err
}
assignList = append(assignList, &assignT{symbol: nameSymbol, value: value})
}
for _, a := range assignList {
if err := w.Set(a.symbol, a.value); err != nil {
return nil, err
}
}
return Null, nil
}
func letValuesToVars(ctx context.Context, w *World, list Node, lexical map[Symbol]Node) error {
for IsSome(list) {
var item Node
var err error
item, list, err = Shift(list)
if err != nil {
return err
}
if symbol, ok := item.(Symbol); ok {
lexical[symbol] = Null
continue
}
var argv [2]Node
if err := ListToArray(item, argv[:]); err != nil {
return err
}
symbol, ok := argv[0].(Symbol)
if !ok {
return MakeError(ErrExpectedSymbol, argv[0])
}
value, err := argv[1].Eval(ctx, w)
if err != nil {
return err
}
lexical[symbol] = value
}
return nil
}
func cmdLet(ctx context.Context, w *World, params Node) (Node, error) {
return cmdLetWithTailRecOpt(ctx, w, params, -1)
}
func cmdLetWithTailRecOpt(ctx context.Context, w *World, params Node, tailOptSym Symbol) (Node, error) {
// from CommonLisp
list, params, err := Shift(params)
if err != nil {
return nil, err
}
lexical := Variables{}
if err := letValuesToVars(ctx, w, list, lexical); err != nil {
return nil, err
}
newWorld := w.Let(lexical)
return prognWithTailRecOpt(ctx, newWorld, params, tailOptSym)
}
func cmdLetX(ctx context.Context, w *World, params Node) (Node, error) {
return cmdLetXWithTailRecOpt(ctx, w, params, -1)
}
func cmdLetXWithTailRecOpt(ctx context.Context, w *World, params Node, tailOptSym Symbol) (Node, error) {
// from CommonLisp
list, params, err := Shift(params)
if err != nil {
return nil, err
}
lexical := Variables{}
newWorld := w.Let(lexical)
if err := letValuesToVars(ctx, newWorld, list, lexical); err != nil {
return nil, err
}
return prognWithTailRecOpt(ctx, newWorld, params, tailOptSym)
}
// cmdDefglobal implements (defglobal) of ISLisp and (defparameter) of CommonLisp
func cmdDefglobal(ctx context.Context, w *World, list Node) (Node, error) {
// from CommonLisp
var symbolNode Node
var value Node
var err error
symbolNode, list, err = Shift(list)
if err != nil {
return nil, err
}
symbol, ok := symbolNode.(Symbol)
if !ok {
return nil, ErrExpectedSymbol
}
value, list, err = w.ShiftAndEvalCar(ctx, list)
if err != nil {
return nil, err
}
if IsSome(list) {
return nil, ErrTooManyArguments
}
w.DefineGlobal(symbol, value)
return symbol, nil
}
func cmdDefDynamic(ctx context.Context, w *World, list Node) (Node, error) {
var err error
var symbolNode Node
symbolNode, list, err = Shift(list)
if err != nil {
return nil, err
}
symbol, ok := symbolNode.(Symbol)
if !ok {
return nil, ErrExpectedSymbol
}
var value Node
value, list, err = w.ShiftAndEvalCar(ctx, list)
if err != nil {
return nil, err
}
if IsSome(list) {
return nil, ErrTooManyArguments
}
w.shared.dynamic.Set(symbol, value)
return symbol, nil
}
func cmdDynamic(ctx context.Context, w *World, list Node) (Node, error) {
var err error
var symbolNode Node
symbolNode, _, err = Shift(list)
if err != nil {
return nil, err
}
symbol, ok := symbolNode.(Symbol)
if !ok {
return nil, ErrExpectedSymbol
}
value, ok := w.shared.dynamic.Get(symbol)
if !ok {
return nil, ErrVariableUnbound
}
return value, nil
}
type Dynamics struct {
backups map[Symbol]Node
removes map[Symbol]struct{}
world *World
}
func (D *Dynamics) Close() {
for key := range D.removes {
delete(D.world.shared.dynamic, key)
}
for key, val := range D.backups {
D.world.shared.dynamic.Set(key, val)
}
}
func (w *World) NewDynamics() *Dynamics {
return &Dynamics{
backups: make(map[Symbol]Node),
removes: make(map[Symbol]struct{}),
world: w,
}
}
func (w *World) Dynamic(name Symbol) Node {
return w.shared.dynamic[name]
}
func (D *Dynamics) Set(symbol Symbol, newValue Node) {
if orig, ok := D.world.shared.dynamic.Get(symbol); ok {
D.backups[symbol] = orig
} else {
D.removes[symbol] = struct{}{}
}
if newValue != nil {
D.world.shared.dynamic.Set(symbol, newValue)
}
}
func cmdDynamicLet(ctx context.Context, w *World, list Node) (Node, error) {
var vars Node
var err error
D := w.NewDynamics()
defer D.Close()
vars, list, err = Shift(list)
if err != nil {
return nil, err
}
for IsSome(vars) {
var varAndValue Node
varAndValue, vars, err = Shift(vars)
if err != nil {
return nil, err
}
if symbol, ok := varAndValue.(Symbol); ok {
D.Set(symbol, Null)
} else {
var symbolNode Node
var value Node
symbolNode, varAndValue, err = Shift(varAndValue)
if err != nil {
return nil, err
}
symbol, ok := symbolNode.(Symbol)
if !ok {
return nil, ErrExpectedSymbol
}
value, varAndValue, err = w.ShiftAndEvalCar(ctx, varAndValue)
if err != nil {
return nil, err
}
if IsSome(varAndValue) {
return nil, ErrTooManyArguments
}
D.Set(symbol, value)
}
}
return Progn(ctx, w, list)
}