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/*
* Wolkenwelten - Copyright (C) 2020-2021 - Benjamin Vincent Schulenburg
*
* This project uses the MIT license, a copy should be included under /LICENSE
*/
#include "closure.h"
#include "special.h"
#include "../display.h"
#include "../exception.h"
#include "../type-system.h"
#include "../allocation/roots.h"
#include "../allocation/val.h"
#include "../collection/list.h"
#include "../collection/tree.h"
#include "../type/closure.h"
#include "../type/native-function.h"
#include "../type/symbol.h"
#include "../type/val.h"
const lSymbol *symType;
const lSymbol *symDocumentation;
const lSymbol *symArguments;
const lSymbol *symCode;
const lSymbol *symData;
static lVal *lnfDef(lClosure *c, lVal *v){
lVal *sym = lCar(v);
if(sym == NULL){return NULL;}
if(sym->type != ltSymbol){sym = lEval(c,sym);}
if(sym->type != ltSymbol){return NULL;}
const lSymbol *s = sym->vSymbol;
lVal *ret = lEval(c,lCadr(v));
lDefineClosureSym(c,s,ret);
return ret;
}
static lVal *lnfSet(lClosure *c, lVal *v){
lVal *sym = lCar(v);
if(sym == NULL){return NULL;}
if(sym->type != ltSymbol){sym = lEval(c,sym);}
if(sym->type != ltSymbol){return NULL;}
const lSymbol *s = sym->vSymbol;
lVal *ret = lEval(c,lCadr(v));
lSetClosureSym(c,s,ret);
return ret;
}
static lVal *lSymTable(lClosure *c, lVal *v){
if(c == NULL){return v;}
lRootsValPush(v);
v = lTreeAddKeysToList(c->data,v);
return lSymTable(c->parent,v);
}
static lVal *lnfSymbolTable(lClosure *c, lVal *v){
(void)v;
return lSymTable(c,NULL);
}
static int lSymCount(lClosure *c, int ret){
if(c == NULL){return ret;}
return lSymCount(c->parent,lTreeSize(c->data) + ret);
}
static lVal *lnfSymCount(lClosure *c, lVal *v){
(void)v;
return lValInt(lSymCount(c,0));
}
static lVal *lnfClosure(lClosure *c, lVal *v){
(void)c;
lVal *car = lCar(v);
if((car == NULL)
|| !((car->type == ltSpecialForm)
|| (car->type == ltNativeFunc)
|| (car->type == ltLambda)
|| (car->type == ltObject)
|| (car->type == ltMacro))){
return NULL;
}
lVal *ret = lRootsValPush(lValTree(NULL));
ret->vTree = lTreeInsert(ret->vTree,lSymS(":type"),lRootsValPush(lValSymS(getTypeSymbol(car))));
if((car->type == ltSpecialForm) || (car->type == ltNativeFunc)){
lNFunc *nf = car->vNFunc;
ret->vTree = lTreeInsert(ret->vTree,symDocumentation,nf->doc);
ret->vTree = lTreeInsert(ret->vTree,symArguments,nf->args);
}else{
lClosure *clo = car->vClosure;
ret->vTree = lTreeInsert(ret->vTree,lSymS(":documentation"),clo->doc);
ret->vTree = lTreeInsert(ret->vTree,lSymS(":arguments"),clo->args);
ret->vTree = lTreeInsert(ret->vTree,lSymS(":code"),clo->text);
ret->vTree = lTreeInsert(ret->vTree,lSymS(":data"), lRootsValPush(lValTree(clo->data)));
}
return ret;
}
static void lClosureSetRec(lClosure *clo, lTree *data){
if(data == NULL){return;}
const lSymbol *sym = data->key;
if(data->key == symDocumentation){
clo->doc = data->value;
}else if(data->key == symArguments){
clo->args = data->value;
}else if(data->key == symCode){
clo->text = data->value;
}else if(data->key == symData){
lTree *newData = castToTree(data->value,NULL);
if(newData){
clo->data = newData;
}
}else {
lExceptionThrowVal(":invalid-field","Trying to set an unknown or forbidden field for a closure", lValSymS(sym));
}
lClosureSetRec(clo,data->left);
lClosureSetRec(clo,data->right);
}
static lVal *lnfClosureSet(lClosure *c, lVal *v){
(void)c;
lVal *car = lCar(v);
lTree *data = castToTree(lCadr(v),NULL);
if((car == NULL) || (data == NULL)
|| !((car->type == ltLambda)
|| (car->type == ltObject)
|| (car->type == ltMacro))){
return NULL;
}
lClosure *clo = car->vClosure;
lClosureSetRec(clo,data);
return NULL;
}
static lVal *lnfLetRaw(lClosure *c, lVal *v){
const int SP = lRootsGet();
lClosure *nc = lRootsClosurePush(lClosureNew(c));
lVal *ret = lnfDo(nc,v);
lRootsRet(SP);
return ret;
}
static lClosure *getNextObject(lClosure *c){
while(c != NULL){
if(c->type == closureConstant){return NULL;}
if(c->type == closureObject){return c;}
c = c->parent;
}
return NULL;
}
static lVal *lnfClSelf(lClosure *c, lVal *v){
c = getNextObject(c);
for(int i=castToInt(lCar(v),0);i>0;i--){
if(c == NULL){return NULL;}
c = getNextObject(c->parent);
}
if(c == NULL){return NULL;}
lVal *ret = lValAlloc();
ret->type = ltObject;
ret->vClosure = c;
return ret;
}
static lVal *lnfResolve(lClosure *c, lVal *v){
const lSymbol *sym = castToSymbol(lCar(v),NULL);
return sym ? lGetClosureSym(c,sym) : NULL;
}
static lVal *lnfResolvesPred(lClosure *c, lVal *v){
const lSymbol *sym = castToSymbol(lCar(v),NULL);
return lValBool(sym ? lHasClosureSym(c,sym,NULL) : false);
}
/* Handler for [λ [...args] ...body] */
static lVal *lnfLambda(lClosure *c, lVal *v){
lVal *car = lCar(v);
lVal *cdr = lCdr(v);
if((v == NULL) || (car == NULL) || (cdr == NULL)){
return NULL;
}
lVal *ret = lRootsValPush(lValAlloc());
ret->type = ltLambda;
ret->vClosure = lClosureNew(c);
ret->vClosure->doc = lCar(cdr);
ret->vClosure->text = lCons(NULL,NULL);
ret->vClosure->text->vList.car = lnfvDo;
ret->vClosure->text->vList.cdr = cdr;
ret->vClosure->args = car;
return ret;
}
/* Handler for [λ* [..args] docstring body] */
static lVal *lnfLambdaRaw(lClosure *c, lVal *v){
lVal *ret = lRootsValPush(lValAlloc());
ret->type = ltLambda;
ret->vClosure = lClosureNew(c);
ret->vClosure->doc = lCadr(v);
ret->vClosure->text = lCaddr(v);
ret->vClosure->args = lCar(v);
return ret;
}
/* Handler for [μ [...args] ...body] */
static lVal *lnfMacro(lClosure *c, lVal *v){
lVal *ret = lnfLambda(c,v);
if(ret){ ret->type = ltMacro; }
return ret;
}
/* Handler for [μ* [...args] ...body] */
static lVal *lnfMacroRaw(lClosure *c, lVal *v){
lVal *ret = lnfLambdaRaw(c,v);
if(ret){ ret->type = ltMacro; }
return ret;
}
/* Handler for [ω ...body] */
static lVal *lnfObject(lClosure *c, lVal *v){
lVal *ret = lRootsValPush(lValAlloc());
ret->type = ltObject;
ret->vClosure = lClosureNew(c);
ret->vClosure->type = closureObject;
lnfDo(ret->vClosure,v);
return ret;
}
static lVal *lnfCurrentClosure(lClosure *c, lVal *v){
(void)v;
lVal *ret = lValAlloc();
ret->type = ltObject;
ret->vClosure = c;
return ret;
}
static lVal *lnfSymbolSearch(lClosure *c, lVal *v){
(void)c;
const lVal *car = lCar(v);
if((car == NULL) || (car->type != ltString)){return NULL;}
const int len = castToInt(lCadr(v), car->vString->bufEnd - car->vString->data);
return lSymbolSearch(car->vString->data, len);
}
void lOperationsClosure(lClosure *c){
symType = lSymS(":type");
symDocumentation = lSymS(":documentation");
symArguments = lSymS(":arguments");
symCode = lSymS(":code");
symData = lSymS(":data");
lAddNativeFunc(c,"resolve", "[sym]", "Resolve SYM until it is no longer a symbol", lnfResolve);
lAddNativeFunc(c,"resolves?", "[sym]", "Check if SYM resolves to a value", lnfResolvesPred);
lAddNativeFunc(c,"closure", "[clo]", "Return a tree with data about CLO", lnfClosure);
lAddNativeFunc(c,"closure!", "[clo data]", "Overwrite fields of CLO with DATA", lnfClosureSet);
lAddNativeFunc(c,"self", "[n]", "Return Nth closest object closure", lnfClSelf);
lAddNativeFunc(c,"current-closure","[n]", "Return the current closure as an object", lnfCurrentClosure);
lAddNativeFunc(c,"symbol-search", "[str len]", "Return a list of all symbols starting with STR",lnfSymbolSearch);
lAddNativeFunc(c,"symbol-table", "[off len]", "Return a list of len symbols defined, accessible from the current closure from offset off",lnfSymbolTable);
lAddNativeFunc(c,"symbol-count", "[]", "Return a count of the symbols accessible from the current closure",lnfSymCount);
lAddSpecialForm(c,"def", "[sym val]", "Define a new symbol SYM and link it to value VAL", lnfDef);
lAddSpecialForm(c,"set!", "[s v]", "Bind a new value v to already defined symbol s", lnfSet);
lAddSpecialForm(c,"let*", "[...body]", "Run body wihtin a new closure", lnfLetRaw);
lAddSpecialForm(c,"λ*", "[args source body]", "Create a new, raw, lambda", lnfLambdaRaw);
lAddSpecialForm(c,"lambda fun λ", "[args ...body]", "Create a new lambda", lnfLambda);
lAddSpecialForm(c,"macro μ", "[args ...body]", "Create a new macro", lnfMacro);
lAddSpecialForm(c,"μ*", "[args source body]", "Create a new, raw, macro", lnfMacroRaw);
lAddSpecialForm(c,"object ω", "[...body]", "Create a new object", lnfObject);
}
