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prim_environment.go
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// Copyright 2015 SteelSeries ApS. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
// This package implements a basic LISP interpretor for embedding in a go program for scripting.
// This file contains the environment frame functions/forms.
package golisp
func RegisterEnvironmentPrimitives() {
MakePrimitiveFunction("environment?", "1", EnvironmentPImpl)
MakePrimitiveFunction("environment-has-parent?", "1", EnvironmentParentPImpl)
MakePrimitiveFunction("environment-bound-names", "1", EnvironmentBoundNamesImpl)
MakePrimitiveFunction("environment-macro-names", "1", EnvironmentMacroNamesImpl)
MakePrimitiveFunction("environment-bindings", "1", EnvironmentBindingsImpl)
MakePrimitiveFunction("environment-reference-type", "2", EnvironmentReferenceTypeImpl)
MakePrimitiveFunction("environment-bound?", "2", EnvironmentBoundPImpl)
MakePrimitiveFunction("environment-assigned?", "2", EnvironmentAssignedPImpl)
MakePrimitiveFunction("environment-lookup", "2", EnvironmentLookupImpl)
MakePrimitiveFunction("environment-lookup-macro", "2", EnvironmentLookupMacroImpl)
MakePrimitiveFunction("environment-assignable?", "2", EnvironmentAssignablePImpl)
MakePrimitiveFunction("environment-assign!", "3", EnvironmentAssignBangImpl)
MakePrimitiveFunction("environment-definable?", "2", EnvironmentDefinablePImpl)
MakePrimitiveFunction("environment-define", "3", EnvironmentDefineImpl)
MakePrimitiveFunction("the-environment", "0", TheEnvironmentImpl)
MakePrimitiveFunction("procedure-environment", "1", ProcedureEnvironmentImpl)
MakePrimitiveFunction("restrict-environment", "0", RestrictEnvironmentImpl)
MakeRestrictedPrimitiveFunction("environment-parent", "1", EnvironmentParentImpl)
MakeRestrictedPrimitiveFunction("system-global-environment", "0", SystemGlobalEnvironmentImpl)
MakeRestrictedPrimitiveFunction("make-top-level-environment", "1|2|3", MakeTopLevelEnvironmentImpl)
MakeRestrictedPrimitiveFunction("find-top-level-environment", "1", FindTopLevelEnvironmentImpl)
}
func EnvironmentPImpl(args *Data, env *SymbolTableFrame) (result *Data, err error) {
return BooleanWithValue(EnvironmentP(Car(args))), nil
}
func EnvironmentParentPImpl(args *Data, env *SymbolTableFrame) (result *Data, err error) {
if !EnvironmentP(Car(args)) {
err = ProcessError("environment-has-parent? requires an environment as it's argument", env)
return
}
e := EnvironmentValue(Car(args))
return BooleanWithValue(e.Parent != nil), nil
}
func EnvironmentParentImpl(args *Data, env *SymbolTableFrame) (result *Data, err error) {
if !EnvironmentP(Car(args)) {
err = ProcessError("environment-parent requires an environment as it's argument", env)
return
}
e := EnvironmentValue(Car(args))
if e.Parent == nil {
return
} else {
return EnvironmentWithValue(e.Parent), nil
}
}
func EnvironmentBoundNamesImpl(args *Data, env *SymbolTableFrame) (result *Data, err error) {
if !EnvironmentP(Car(args)) {
err = ProcessError("environment-bound-names requires an environment as it's argument", env)
return
}
e := EnvironmentValue(Car(args))
keys := make([]*Data, 0, 0)
for _, val := range e.Bindings {
keys = append(keys, val.Sym)
}
return ArrayToList(keys), nil
}
func EnvironmentMacroNamesImpl(args *Data, env *SymbolTableFrame) (result *Data, err error) {
if !EnvironmentP(Car(args)) {
err = ProcessError("environment-macro-names requires an environment as it's argument", env)
return
}
e := EnvironmentValue(Car(args))
keys := make([]*Data, 0, 0)
for _, val := range e.Bindings {
if MacroP(val.Val) {
keys = append(keys, val.Sym)
}
}
return ArrayToList(keys), nil
}
func EnvironmentBindingsImpl(args *Data, env *SymbolTableFrame) (result *Data, err error) {
if !EnvironmentP(Car(args)) {
err = ProcessError("environment-bindings requires an environment as it's argument", env)
return
}
e := EnvironmentValue(Car(args))
keys := make([]*Data, 0, 0)
for _, val := range e.Bindings {
if NilP(val.Val) {
keys = append(keys, InternalMakeList(val.Sym))
} else {
keys = append(keys, InternalMakeList(val.Sym, val.Val))
}
}
return ArrayToList(keys), nil
}
func EnvironmentReferenceTypeImpl(args *Data, env *SymbolTableFrame) (result *Data, err error) {
if !EnvironmentP(Car(args)) {
err = ProcessError("environment-reference-type? requires an environment as it's first argument", env)
return
}
if !SymbolP(Cadr(args)) {
err = ProcessError("environment-reference-type? requires a symbol as it's second argument", env)
return
}
localEnv := EnvironmentValue(Car(args))
binding, found := localEnv.FindBindingFor(Cadr(args))
if !found {
result = Intern("unbound")
} else if binding.Val == nil {
result = Intern("unassigned")
} else if MacroP(binding.Val) {
result = Intern("macro")
} else {
result = Intern("normal")
}
return
}
func EnvironmentBoundPImpl(args *Data, env *SymbolTableFrame) (result *Data, err error) {
if !EnvironmentP(Car(args)) {
err = ProcessError("environment-bound? requires an environment as it's first argument", env)
return
}
if !SymbolP(Cadr(args)) {
err = ProcessError("environment-bound? requires a symbol as it's second argument", env)
return
}
localEnv := EnvironmentValue(Car(args))
_, found := localEnv.FindBindingFor(Cadr(args))
return BooleanWithValue(found), nil
}
func EnvironmentAssignedPImpl(args *Data, env *SymbolTableFrame) (result *Data, err error) {
if !EnvironmentP(Car(args)) {
err = ProcessError("environment-asigned? requires an environment as it's first argument", env)
return
}
if !SymbolP(Cadr(args)) {
err = ProcessError("environment-assigned? requires a symbol as it's second argument", env)
return
}
localEnv := EnvironmentValue(Car(args))
binding, found := localEnv.FindBindingFor(Cadr(args))
if found {
if binding.Val == nil {
result = LispFalse
} else if MacroP(binding.Val) {
err = ProcessError("environment-assigned?: name is bound to a macro", env)
return
} else {
result = LispTrue
}
} else {
err = ProcessError("environment-assigned?: name is unbound", env)
return
}
return
}
func EnvironmentLookupImpl(args *Data, env *SymbolTableFrame) (result *Data, err error) {
if !EnvironmentP(Car(args)) {
err = ProcessError("environment-lookup requires an environment as it's first argument", env)
return
}
if !SymbolP(Cadr(args)) {
err = ProcessError("environment-lookup requires a symbol as it's second argument", env)
return
}
localEnv := EnvironmentValue(Car(args))
binding, found := localEnv.FindBindingFor(Cadr(args))
if found {
if binding.Val == nil {
err = ProcessError("environment-lookup: name is unassigned", env)
return
} else if MacroP(binding.Val) {
err = ProcessError("environment-lookup: name is bound to a macro", env)
return
} else {
return binding.Val, nil
}
} else {
err = ProcessError("environment-lookup: name is unbound", env)
return
}
}
func EnvironmentLookupMacroImpl(args *Data, env *SymbolTableFrame) (result *Data, err error) {
if !EnvironmentP(Car(args)) {
err = ProcessError("environment-lookup-macro requires an environment as it's first argument", env)
return
}
if !SymbolP(Cadr(args)) {
err = ProcessError("environment-lookup-macro requires a symbol as it's second argument", env)
return
}
localEnv := EnvironmentValue(Car(args))
binding, found := localEnv.FindBindingFor(Cadr(args))
if found && MacroP(binding.Val) {
result = binding.Val
} else {
result = LispFalse
}
return
}
func EnvironmentAssignablePImpl(args *Data, env *SymbolTableFrame) (result *Data, err error) {
if !EnvironmentP(Car(args)) {
err = ProcessError("environment-assignable? requires an environment as it's first argument", env)
return
}
if !SymbolP(Cadr(args)) {
err = ProcessError("environment-assignable? requires a symbol as it's second argument", env)
return
}
localEnv := EnvironmentValue(Car(args))
_, found := localEnv.FindBindingFor(Cadr(args))
return BooleanWithValue(found), nil
}
func EnvironmentAssignBangImpl(args *Data, env *SymbolTableFrame) (result *Data, err error) {
if !EnvironmentP(Car(args)) {
err = ProcessError("environment-assign! requires an environment as it's first argument", env)
return
}
if !SymbolP(Cadr(args)) {
err = ProcessError("environment-assign! requires a symbol as it's second argument", env)
return
}
localEnv := EnvironmentValue(Car(args))
binding, found := localEnv.FindBindingFor(Cadr(args))
if found {
result = Caddr(args)
binding.Val = result
}
return
}
func EnvironmentDefinablePImpl(args *Data, env *SymbolTableFrame) (result *Data, err error) {
if !EnvironmentP(Car(args)) {
err = ProcessError("environment-definable? requires an environment as it's first argument", env)
return
}
if !SymbolP(Cadr(args)) {
err = ProcessError("environment-definable? requires a symbol as it's second argument", env)
return
}
return LispTrue, nil
}
func EnvironmentDefineImpl(args *Data, env *SymbolTableFrame) (result *Data, err error) {
if !EnvironmentP(Car(args)) {
err = ProcessError("environment-define requires an environment as it's first argument", env)
return
}
if !SymbolP(Cadr(args)) {
err = ProcessError("environment-define requires a symbol as it's second argument", env)
return
}
_, err = EnvironmentValue(Car(args)).BindLocallyTo(Cadr(args), Caddr(args))
return Caddr(args), err
}
func SystemGlobalEnvironmentImpl(args *Data, env *SymbolTableFrame) (result *Data, err error) {
return EnvironmentWithValue(Global), nil
}
func TheEnvironmentImpl(args *Data, env *SymbolTableFrame) (result *Data, err error) {
if env == Global || env.Parent == Global {
return EnvironmentWithValue(env), nil
} else {
err = ProcessError("the-environment can only be called from a top-level environment", env)
return
}
}
func MakeTopLevelEnvironmentImpl(args *Data, env *SymbolTableFrame) (result *Data, err error) {
var name string
if StringP(Car(args)) {
name = StringValue(Car(args))
args = Cdr(args)
} else {
name = "anonymous top level"
}
newEnv := NewSymbolTableFrameBelow(Global, name)
if Length(args) == 1 {
if !ListP(Car(args)) {
err = ProcessError("make-top-level-environment expects binding names to be a list", env)
return
}
for cell := Car(args); NotNilP(cell); cell = Cdr(cell) {
if !SymbolP(Car(cell)) {
err = ProcessError("make-top-level-environment expects binding names to be symbols", env)
return
}
_, err = newEnv.BindLocallyTo(Car(cell), nil)
if err != nil {
return
}
}
} else if Length(args) == 2 {
if !ListP(Car(args)) {
err = ProcessError("make-top-level-environment expects binding names to be a list", env)
return
}
if !ListP(Cadr(args)) {
err = ProcessError("make-top-level-environment expects binding values to be a list", env)
return
}
if Length(Car(args)) != Length(Cadr(args)) {
err = ProcessError("make-top-level-environment expects binding names and values lists to be the same length", env)
return
}
for cell, valcell := Car(args), Cadr(args); NotNilP(cell); cell, valcell = Cdr(cell), Cdr(valcell) {
if !SymbolP(Car(cell)) {
err = ProcessError("make-top-level-environment expects binding names to be symbols", env)
return
}
_, err = newEnv.BindLocallyTo(Car(cell), Car(valcell))
if err != nil {
return
}
}
}
return EnvironmentWithValue(newEnv), nil
}
func FindTopLevelEnvironmentImpl(args *Data, env *SymbolTableFrame) (result *Data, err error) {
if !StringP(Car(args)) && !SymbolP(Car(args)) {
err = ProcessError("find-top-level-environment expects a symbol or string environment name", env)
return
}
TopLevelEnvironments.Mutex.RLock()
defer TopLevelEnvironments.Mutex.RUnlock()
e := TopLevelEnvironments.Environments[StringValue(Car(args))]
if e == nil {
return nil, nil
} else {
return EnvironmentWithValue(e), nil
}
}
func ProcedureEnvironmentImpl(args *Data, env *SymbolTableFrame) (result *Data, err error) {
if TypeOf(Car(args)) != FunctionType {
err = ProcessError("procedure-environment requires a user written function as it's argument", env)
return
}
return EnvironmentWithValue(FunctionValue(Car(args)).Env), nil
}
func RestrictEnvironmentImpl(args *Data, env *SymbolTableFrame) (result *Data, err error) {
env.IsRestricted = true
return StringWithValue("OK"), nil
}