Started on function type and added copy operation

Makefile

@@ -1,5 +1,5 @@
-run: prompt.c loperations.o lnumbers.o lexpressions.o lio.o lerror.o mpc.o
-	cc -std=c99 -Wall prompt.c loperations.o lnumbers.o lexpressions.o lio.o lerror.o mpc.o -ledit -lm -o prompt
+run: prompt.c loperations.o lnumbers.o lexpressions.o lio.o lerror.o lenvironment.o mpc.o
+	cc -std=c99 -Wall prompt.c loperations.o lnumbers.o lexpressions.o lio.o lerror.o lenvironment.o mpc.o -ledit -lm -o prompt
 loperations.o: lval/operations.c lval/operations.h
 	cc -std=c99 -Wall -c lval/operations.c -o loperations.o
 lnumbers.o: lval/numbers.c lval/numbers.h
@@ -10,6 +10,8 @@ lio.o: lval/io.c lval/io.h
 	cc -std=c99 -Wall -c lval/io.c -o lio.o
 lerror.o: lval/error.c lval/error.h
 	cc -std=c99 -Wall -c lval/error.c -o lerror.o
+lenvironment.o: lval/environment.c lval/environment.h
+	cc -std=c99 -Wall -c lval/environment.c -o lenvironment.o
 mpc.o: mpc.c mpc.h
 	cc -std=c99 -Wall -lm -c mpc.c 
 clean:

lval.h

@@ -14,5 +14,7 @@
 #include "lval/operations.h"
 // Add the ability to print out lval structures
 #include "lval/io.h"
+// Add environments, variables, and functions
+#include "lval/environment.h"
 
 #endif

lval/base.h

@@ -1,24 +1,34 @@
 #ifndef LVAL_BASE
 #define LVAL_BASE
+
+struct lval;
+struct lenv;
+
+typedef struct lval lval;
+typedef struct lenv lenv;
+
+typedef lval* (*lbuiltin) (lenv*, lval*);
+
 typedef union typeval {
 	long num;
 	double dec;
 } TypeVal;
 
 // A lispy value can either be a number, error, symbol, or an expression
-typedef struct lval {
+struct lval {
 	int type;
 	TypeVal data;
 
 	// Error and symbols contain string data
 	char* err;
 	char* sym;
+	lbuiltin fun;
 
 	// Count and pointer to a list of lval*
 	int count;
-	struct lval** cell;
-} lval;
+	lval** cell;
+};
 
 // Possible lispy value types
-enum { LVAL_ERR, LVAL_LONG, LVAL_DOUBLE, LVAL_SYM, LVAL_SEXPR, LVAL_QEXPR };
+enum { LVAL_ERR, LVAL_LONG, LVAL_DOUBLE, LVAL_SYM, LVAL_SEXPR, LVAL_QEXPR, LVAL_FUN };
 #endif

lval/environment.c

@@ -0,0 +1,8 @@
+#include "environment.h"
+
+lval* lval_fun(lbuiltin func) {
+    lval* v = malloc(sizeof(lval));
+    v->type = LVAL_FUN;
+    v->fun = func;
+    return v;
+}

lval/environment.h

@@ -0,0 +1,7 @@
+#ifndef LVAL_ENVIRONMENT
+#define LVAL_ENVIRONMENT
+#include "base.h"
+
+lval* lval_fun(lbuiltin func);
+
+#endif

lval/io.c

@@ -29,6 +29,8 @@ void flval_print(FILE* stream, lval* v) {
 		case LVAL_SEXPR: flval_expr_print(stream, v, '(', ')'); break;
 
 		case LVAL_QEXPR: flval_expr_print(stream, v, '{', '}'); break;
+
+		case LVAL_FUN: fprintf(stream, "<function>"); break;
 	}
 }
 

lval/operations.c

@@ -54,6 +54,7 @@ void lval_del(lval* v) {
 	switch (v->type) {
 		case LVAL_LONG: break;
 		case LVAL_DOUBLE: break;
+		case LVAL_FUN: break;
 
 		// Free the string data
 		case LVAL_ERR: free(v->err); break;
@@ -75,4 +76,36 @@ void lval_del(lval* v) {
 	free(v);
 }
 
+lval* lval_copy(lval* v) {
+	lval* x = (lval*) malloc(sizeof(lval));
+	x->type = v->type;
+
+	switch (v->type)  {
+		// Copy numbers and functions directly
+		case LVAL_LONG: x->data.num = v->data.num; break;
+		case LVAL_DOUBLE: x->data.dec = v->data.dec; break;
+		case LVAL_FUN: x->fun = v->fun; break;
+
+		// Copy strings using malloc and strcpy
+		case LVAL_ERR:
+			x->err = (char*) malloc(strlen(v->err) + 1);
+			strcpy(x->err, v->err); break;
+		case LVAL_SYM:
+			x->sym = (char*) malloc(strlen(v->sym) + 1);
+			strcpy(x->sym, v->sym); break;
+		
+		// Copy lists by copying each sub-expression
+		case LVAL_SEXPR:
+		case LVAL_QEXPR:
+			x->count = v->count;
+			x->cell = (lval**) malloc(sizeof(lval*) * x->count);
+			for (int i = 0; i < x->count; i++) {
+				x->cell[i] = lval_copy(v->cell[i]);
+			}
+			break;
+	}
+
+	return x;
+}
+
 

lval/operations.h

@@ -8,11 +8,12 @@
 lval* lval_sym(char* s);
 
 /*
-    Methods to read (parse AST), evaluate, 
-    and delete lval structures
+    Methods to read (parse AST), evaluate,
+    copy, and delete lval structures
 */
 lval* lval_read(mpc_ast_t* t);
 lval* lval_eval(lval* v);
 void lval_del(lval* v);
+lval* lval_copy(lval* v);
 
 #endif

prompt.c

@@ -53,12 +53,7 @@ int main (int argc, char** argv) {
 			"number   : /[0-9]+/;						                     "
 			"long     : /-?[0-9]+/;	                    	                 "
 			"double   : <long> '.' <number>;                                 "
-			"symbol   : '+' | '-' | '*' | '/' | '%'                          \
-				      | '^' | \"min\" | \"max\" 	                         \
-					  |	\"list\" | \"head\" | \"tail\" 						 \
-					  | \"join\" | \"eval\" | \"len\"						 \
-					  | \"init\" | \"cons\";                                 "
-		
+			"symbol   : /[a-zA-Z0-9_+\\-*\\/\\\\=<>!&]+/;                    "
 			"sexpr    : '(' <expr>* ')';					                 "
 			"qexpr    : '{' <expr>* '}';                                     "
 			"expr     : (<double> | <long>) | <symbol> | <sexpr> | <qexpr>;  "