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Added comparisons < > <= >=

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This commit is contained in:
Sam Stevens
2014-05-29 14:07:06 +01:00
parent a56e93808d
commit 3df5b9ae84
3 changed files with 122 additions and 32 deletions
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134
functions.c
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@@ -22,6 +22,12 @@ void lenv_add_builtin_funcs(lenv* env) {
lenv_add_builtin(env, "*", builtin_mul);
lenv_add_builtin(env, "^", builtin_pow);
//Comparison functions
lenv_add_builtin(env, ">", builtin_comp_gt);
lenv_add_builtin(env, "<", builtin_comp_lt);
lenv_add_builtin(env, ">=", builtin_comp_ge);
lenv_add_builtin(env, "<=", builtin_comp_le);
//List/Util functions
lenv_add_builtin(env, "list", builtin_list);
lenv_add_builtin(env, "eval", builtin_eval);
@@ -38,31 +44,35 @@ void lenv_add_builtin_funcs(lenv* env) {
lenv_add_builtin(env, "\\", builtin_lambda);
}
lval* builtin_add(lenv* env, lval* val) {
return builtin_op(env, val, "+");
char* builtin_op_strname(BUILTIN_OP_TYPE op) {
switch(op) {
// Operators
case BUILTIN_OP_ADD: return "+";
case BUILTIN_OP_SUB: return "-";
case BUILTIN_OP_MUL: return "*";
case BUILTIN_OP_DIV: return "/";
case BUILTIN_OP_POW: return "^";
// Comparisons
case BUILTIN_COMP_GT: return ">";
case BUILTIN_COMP_LT: return "<";
case BUILTIN_COMP_GE: return ">=";
case BUILTIN_COMP_LE: return "<=";
default: return "UNKNOWN";
}
}
lval* builtin_sub(lenv* env, lval* val) {
return builtin_op(env, val, "-");
}
lval* builtin_div(lenv* env, lval* val) {
return builtin_op(env, val, "+");
}
lval* builtin_mul(lenv* env, lval* val) {
return builtin_op(env, val, "*");
}
lval* builtin_pow(lenv* env, lval* val){
return builtin_op(env, val, "^");
}
lval* builtin_op(lenv* env, lval* val, char* op) {
//Start Math Functions
lval* builtin_op(lenv* env, lval* val, BUILTIN_OP_TYPE op) {
//Ensure numbers only
for(int i = 0; i < val->cell_count; i++) {
LASSERT_TYPE(op, val, val->cell_list[i], LVAL_NUM);
LASSERT_TYPE(builtin_op_strname(op), val, val->cell_list[i], LVAL_NUM);
}
//Get the first element
lval* x = lval_pop(val, 0);
if (strcmp(op, "-") == 0 && val->cell_count == 0) {
if (op == BUILTIN_OP_SUB && val->cell_count == 0) {
x->data.num = -x->data.num;
}
@@ -70,21 +80,28 @@ lval* builtin_op(lenv* env, lval* val, char* op) {
//Get next to process
lval* y = lval_pop(val, 0);
if (strcmp(op, "+") == 0) { x->data.num += y->data.num; }
if (strcmp(op, "-") == 0) { x->data.num -= y->data.num; }
if (strcmp(op, "*") == 0) { x->data.num *= y->data.num; }
if (strcmp(op, "^") == 0) { x->data.num = pow(x->data.num,y->data.num); }
if (strcmp(op, "/") == 0) {
short divZero = 0;
if (y->type == LVAL_NUM && fabs(y->data.num) <= DBL_EPSILON) {divZero = 1;}
switch(op) {
case BUILTIN_OP_ADD: x->data.num += y->data.num; break;
case BUILTIN_OP_SUB: x->data.num -= y->data.num; break;
case BUILTIN_OP_MUL: x->data.num *= y->data.num; break;
case BUILTIN_OP_POW: x->data.num = pow(x->data.num,y->data.num); break;
case BUILTIN_OP_DIV: ;
short divZero = 0;
if (y->type == LVAL_NUM && fabs(y->data.num) <= DBL_EPSILON) {divZero = 1;}
if (divZero) {
lval_delete(x);
lval_delete(y);
x = lval_err(LERR_DIV_ZERO);
if (divZero) {
lval_delete(x);
lval_delete(y);
x = lval_err(LERR_DIV_ZERO);
break;
} else {
x->data.num /= y->data.num;
}
break;
default:
lval_delete(val);
return lval_err_detail(LERR_BAD_OP, "expected operator got %s", builtin_op_strname(op));
break;
}
x->data.num /= y->data.num;
}
lval_delete(y);
@@ -93,7 +110,59 @@ lval* builtin_op(lenv* env, lval* val, char* op) {
lval_delete(val);
return x;
}
lval* builtin_add(lenv* env, lval* val) {
return builtin_op(env, val, BUILTIN_OP_ADD);
}
lval* builtin_sub(lenv* env, lval* val) {
return builtin_op(env, val, BUILTIN_OP_SUB);
}
lval* builtin_div(lenv* env, lval* val) {
return builtin_op(env, val, BUILTIN_OP_DIV);
}
lval* builtin_mul(lenv* env, lval* val) {
return builtin_op(env, val, BUILTIN_OP_MUL);
}
lval* builtin_pow(lenv* env, lval* val){
return builtin_op(env, val, BUILTIN_OP_POW);
}
//End Math Functions
//Start Comparison Functions
lval* builtin_comp(lenv* env, lval* val, BUILTIN_OP_TYPE op) {
char* opName = builtin_op_strname(op);
LASSERT_ARG_COUNT(opName, val, val, 2);
LASSERT_TYPE(opName, val, val->cell_list[0], LVAL_NUM);
LASSERT_TYPE(opName, val, val->cell_list[1], LVAL_NUM);
int r = 0;
switch(op) {
case BUILTIN_COMP_GT: r = val->cell_list[0]->data.num > val->cell_list[1]->data.num; break;
case BUILTIN_COMP_LT: r = val->cell_list[0]->data.num < val->cell_list[1]->data.num; break;
case BUILTIN_COMP_GE: r = val->cell_list[0]->data.num >= val->cell_list[1]->data.num; break;
case BUILTIN_COMP_LE: r = val->cell_list[0]->data.num <= val->cell_list[1]->data.num; break;
default:
lval_delete(val);
return lval_err_detail(LERR_BAD_OP, "Invalid comparison got %s", builtin_op_strname(op));
break;
}
lval_delete(val);
return lval_num(r);
}
lval* builtin_comp_gt(lenv* env, lval* val) {
return builtin_comp(env, val, BUILTIN_COMP_GT);
}
lval* builtin_comp_lt(lenv* env, lval* val) {
return builtin_comp(env, val, BUILTIN_COMP_LT);
}
lval* builtin_comp_ge(lenv* env, lval* val) {
return builtin_comp(env, val, BUILTIN_COMP_GE);
}
lval* builtin_comp_le(lenv* env, lval* val) {
return builtin_comp(env, val, BUILTIN_COMP_LE);
}
//End Comparison Functions
//Start List/Util functions
lval* builtin_list(lenv* env, lval* val){
val->type = LVAL_Q_EXPR;
return val;
@@ -138,7 +207,9 @@ lval* builtin_tail(lenv* env, lval* val){
lval_delete(lval_pop(x, 0));
return x;
}
//End List/Util functions
//Start ENV Functions
lval* builtin_envdef(lenv* env, lval* val, char* type){
LASSERT_MIN_ARG_COUNT(type, val, val, 1);
LASSERT_TYPE(type, val, val->cell_list[0], LVAL_Q_EXPR);
@@ -217,4 +288,5 @@ lval* builtin_lambda(lenv* env, lval* val) {
lambda->data.func->va = va;
lval_delete(val);
return lambda;
}
}
//End ENV Functions