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advanced.go
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advanced.go
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/*
*
* Copyright 2022 indentlang authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
*/
package builtins
import (
"github.com/dvaumoron/indentlang/parser"
"github.com/dvaumoron/indentlang/types"
)
type quoteIterator struct {
types.NoneType
inner types.Iterator
env types.Environment
}
func (q quoteIterator) Iter() types.Iterator {
return q
}
func (q quoteIterator) Next() (types.Object, bool) {
value, ok := q.inner.Next()
return evalUnquote(value, q.env), ok
}
func (q quoteIterator) Close() {
q.inner.Close()
}
func evalUnquote(object types.Object, env types.Environment) types.Object {
list, ok := object.(*types.List)
if !ok || list.Size() == 0 {
return object
}
it := list.Iter()
defer it.Close()
value, _ := it.Next()
id, _ := value.(types.Identifier)
if id == parser.UnquoteName { // non indentifier are ""
arg, _ := it.Next()
return arg.Eval(env)
}
resList := types.NewList()
resList.ImportCategories(list)
resList.Add(evalUnquote(value, env))
resList.AddAll(makeQuoteIterator(it, env))
return resList
}
func makeQuoteIterator(it types.Iterator, env types.Environment) quoteIterator {
return quoteIterator{inner: it, env: env}
}
func quoteForm(env types.Environment, itArgs types.Iterator) types.Object {
arg, _ := itArgs.Next()
return evalUnquote(arg, env)
}
// user can make (Lambda (x) (Return x))
func unquoteFunc(env types.Environment, itArgs types.Iterator) types.Object {
arg, _ := itArgs.Next()
return arg.Eval(env)
}
// allow lazy execution after Import with Quote
func evalForm(env types.Environment, itArgs types.Iterator) types.Object {
arg, _ := itArgs.Next()
// the first Eval get the code (from Identifier in general),
// the second do the real work
return arg.Eval(env).Eval(env)
}
func delForm(env types.Environment, itArgs types.Iterator) types.Object {
arg0, _ := itArgs.Next()
arg1, ok := itArgs.Next()
if ok {
dict, _ := arg0.Eval(env).(types.Environment)
if dict != nil {
dict.Delete(arg1.Eval(env))
}
return types.None
}
id, ok := arg0.(types.Identifier)
if ok {
env.DeleteStr(string(id))
}
return types.None
}
func addCategoryFunc(env types.Environment, itArgs types.Iterator) types.Object {
arg0, _ := itArgs.Next()
arg1, ok := itArgs.Next()
if !ok {
return types.None
}
list, ok := arg0.Eval(env).(*types.List)
if !ok {
return types.None
}
str, ok := arg1.Eval(env).(types.String)
if ok {
list.AddCategory(string(str))
}
return types.None
}
func hasCategoryFunc(env types.Environment, itArgs types.Iterator) types.Object {
arg0, _ := itArgs.Next()
arg1, ok := itArgs.Next()
if !ok {
return types.Boolean(false)
}
list, ok := arg0.Eval(env).(*types.List)
if !ok {
return types.Boolean(false)
}
str, ok := arg1.Eval(env).(types.String)
if !ok {
return types.Boolean(false)
}
return types.Boolean(list.HasCategory(string(str)))
}
func addCustomRuleFunc(env types.Environment, itArgs types.Iterator) types.Object {
arg, _ := itArgs.Next()
rule, ok := arg.Eval(env).(types.Appliable)
if ok {
parser.CustomRules.Add(rule)
}
return types.None
}
func parseWordFunc(env types.Environment, itArgs types.Iterator) types.Object {
arg, _ := itArgs.Next()
str, _ := arg.Eval(env).(types.String)
list := types.NewList()
if str != "" { // non string and empty string are treated the same way thanks to type assertion
parser.HandleClassicWord(string(str), list)
}
return list.LoadInt(0) // None if the list is still empty
}
func getEnvFunc(env types.Environment, itArgs types.Iterator) types.Object {
return env
}