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/* Nujel - Copyright (C) 2020-2022 - Benjamin Vincent Schulenburg
* This project uses the MIT license, a copy should be included under /LICENSE */
#include "../operation.h"
#include "../misc/pf.h"
#include "../allocation/symbol.h"
#include "../exception.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) || (sym->type != ltSymbol)){
lExceptionThrowValClo("type-error","def needs a symbol as its first argument", v, c);
/* Never Returns */
}
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) || (sym->type != ltSymbol)){
lExceptionThrowValClo("type-error","def needs a symbol as its first argument", v, c);
/* Never Returns */
}
const lSymbol *s = sym->vSymbol;
lVal *ret = lEval(c,lCadr(v));
if(!lSetClosureSym(c,s,ret)){
lExceptionThrowValClo("unbound-variable","set! only works with symbols that already have an associated value", lCar(v), c);
}
return ret;
}
static lVal *lSymTable(lClosure *c, lVal *v){
if(c == NULL){return v;}
lRootsValPush(v);
lVal *l = lTreeAddKeysToList(c->data,v);
return lSymTable(c->parent,l);
}
static lVal *lnfSymbolTable(lClosure *c, lVal *v){
(void)v;
lVal *l = lSymTable(c,NULL);
for(lVal *n = l;n;n = n->vList.cdr){
if(n->vList.car == NULL){break;}
n->vList.car->type = ltSymbol;
}
return l;
}
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, RSYMP(lSymS("type")),lRootsValPush(lValSymS(getTypeSymbol(car))));
if((car->type == ltSpecialForm) || (car->type == ltNativeFunc)){
lNFunc *nf = car->vNFunc;
if(nf == NULL){return ret;}
ret->vTree = lTreeInsert(ret->vTree, symDocumentation,nf->doc);
ret->vTree = lTreeInsert(ret->vTree, symArguments,nf->args);
ret->vTree = lTreeInsert(ret->vTree, RSYMP(lSymS("name")),lValSymS(nf->name));
}else{
lClosure *clo = car->vClosure;
if(clo == NULL){return ret;}
ret->vTree = lTreeInsert(ret->vTree, symDocumentation, clo->doc);
ret->vTree = lTreeInsert(ret->vTree, symArguments, clo->args);
ret->vTree = lTreeInsert(ret->vTree, RSYMP(lSymS("name")), RVP(lValSymS(clo->name)));
ret->vTree = lTreeInsert(ret->vTree, RSYMP(lSymS("code")), clo->text);
ret->vTree = lTreeInsert(ret->vTree, RSYMP(lSymS("data")), RVP(lValTree(clo->data)));
if(clo->type == closureCall){
ret->vTree = lTreeInsert(ret->vTree, RSYMP(lSymS("call")), lRootsValPush(lValBool(true)));
}
}
return ret;
}
static lVal *lnfClosureParent(lClosure *c, lVal *v){
(void)c;
lVal *car = lCar(v);
if((car == NULL)
|| !((car->type == ltLambda)
|| (car->type == ltObject)
|| (car->type == ltMacro))){
return NULL;
}else if(car->vClosure->parent == NULL){
return NULL;
}else{
lVal *ret = lValAlloc(car->vClosure->parent->type == closureObject ? ltObject : ltLambda);
ret->vClosure = car->vClosure->parent;
return ret;
}
}
static lVal *lnfClosureCaller(lClosure *c, lVal *v){
(void)c;
lVal *car = lCar(v);
if((car == NULL)
|| !((car->type == ltLambda)
|| (car->type == ltObject)
|| (car->type == ltMacro))){
return NULL;
}else if(car->vClosure->caller == NULL){
return NULL;
}else{
lVal *ret = lValAlloc(car->vClosure->caller->type == closureObject ? ltObject : ltLambda);
ret->vClosure = car->vClosure->caller;
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){
clo->data = castToTree(data->value,NULL);
}else {
lExceptionThrowValClo("invalid-field","Trying to set an unknown or forbidden field for a closure", lValSymS(sym), clo);
}
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(data == NULL){
lExceptionThrowValClo("type-error","expected a tree", lCadr(v), c);
}
if((car == 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));
nc->name = c->name;
nc->caller = c->caller;
nc->type = c->type;
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(ltObject);
ret->vClosure = c;
return ret;
}
static lVal *lnfResolve(lClosure *c, lVal *v){
const lSymbol *sym = castToSymbol(lCar(v),NULL);
lVal *env = lCadr(v);
if(env && (env->type != ltLambda) && (env->type != ltObject)){
lExceptionThrowValClo("invalid-environment", "You can only resolve symbols in Lambdas or Objects", env, c);
}
return sym ? lGetClosureSym(env ? env->vClosure : c, sym) : NULL;
}
static lVal *lnfResolvesPred(lClosure *c, lVal *v){
const lSymbol *sym = castToSymbol(lCar(v),NULL);
lVal *env = lCadr(v);
if(env && (env->type != ltLambda) && (env->type != ltObject)){
lExceptionThrowValClo("invalid-environment", "You can only resolve symbols in Lambdas or Objects", env, c);
}
return lValBool(sym ? lHasClosureSym(env ? env->vClosure : c, sym,NULL) : false);
}
/* Handler for [λ* name [..args] docstring body] */
static lVal *lnfLambdaAst(lClosure *c, lVal *v){
return lLambdaNew(c, lCar(v), lCadr(v), lCaddr(v), lCadddr(v));
}
/* Handler for [λδ name [..args] docstring body] */
static lVal *lnfLambdaBytecodeAst(lClosure *c, lVal *v){
lVal *ret = lLambdaNew(c, lCar(v), lCadr(v), lCaddr(v), lCadddr(v));
ret->vClosure->type = closureUnlinkedBytecode;
return ret;
}
/* Handler for [macro* [...args] ...body] */
static lVal *lnfMacroBytecodeAst(lClosure *c, lVal *v){
lVal *ret = lnfLambdaBytecodeAst(c,v);
if(ret){ ret->type = ltMacro; }
return ret;
}
/* Handler for [μ* [...args] ...body] */
static lVal *lnfMacroAst(lClosure *c, lVal *v){
lVal *ret = lnfLambdaAst(c,v);
if(ret){ ret->type = ltMacro; }
return ret;
}
/* Handler for [ω* ...body] */
static lVal *lnfObjectAst(lClosure *c, lVal *v){
lVal *ret = lRootsValPush(lValAlloc(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(ltObject);
ret->vClosure = c;
return ret;
}
static lVal *lnfCurrentLambda(lClosure *c, lVal *v){
(void)v;
lVal *ret = lValAlloc(ltLambda);
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 = RSYMP(lSymS("type"));
symDocumentation = RSYMP(lSymS("documentation"));
symArguments = RSYMP(lSymS("arguments"));
symCode = RSYMP(lSymS("code"));
symData = RSYMP(lSymS("data"));
lAddNativeFunc(c,"resolve", "[sym environment]", "Resolve SYM until it is no longer a symbol", lnfResolve);
lAddNativeFunc(c,"resolves?", "[sym environment]", "Check if SYM resolves to a value", lnfResolvesPred);
lAddNativeFunc(c,"closure", "[clo]", "Return a tree with data about CLO", lnfClosure);
lAddNativeFunc(c,"closure-parent", "[clo]", "Return the parent of CLO", lnfClosureParent);
lAddNativeFunc(c,"closure-caller", "[clo]", "Return the caller of CLO", lnfClosureCaller);
lAddNativeFunc(c,"closure!", "[clo data]", "Overwrite fields of CLO with DATA", lnfClosureSet);
lAddNativeFunc(c,"current-closure","[]", "Return the current closure as an object", lnfCurrentClosure);
lAddNativeFunc(c,"current-lambda", "[]", "Return the current closure as a lambda", lnfCurrentLambda);
lAddNativeFunc(c,"self", "[n]", "Return Nth closest object closure", lnfClSelf);
lAddNativeFunc(c,"symbol-search", "[str len]", "Return a list of all symbols starting with STR",lnfSymbolSearch);
lAddNativeFunc(c,"symbol-count", "[]", "Return a count of the symbols accessible from the current closure",lnfSymCount);
lAddNativeFunc(c,"symbol-table*", "[]", "Return a list of all symbols defined, accessible from the current closure",lnfSymbolTable);
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,"macro*", "[name args source body]", "Create a new, bytecoded, macro", lnfMacroBytecodeAst);
lAddSpecialForm(c,"fn*", "[name args source body]", "Create a new, bytecoded, lambda", lnfLambdaBytecodeAst);
lAddSpecialForm(c,"λ*", "[name args source body]", "Create a new, raw, lambda", lnfLambdaAst);
lAddSpecialForm(c,"μ*", "[name args source body]", "Create a new, raw, macro", lnfMacroAst);
lAddSpecialForm(c,"ω*", "[body]", "Create a new object", lnfObjectAst);
}
