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feat: add variable definitions.

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NunoSempere 2023-05-02 15:05:03 -04:00
parent aafc697a59
commit 167dceddff
2 changed files with 26 additions and 2 deletions
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src/mumble.c
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@ -358,10 +358,10 @@ void print_lispval_tree(lispval* v, int indent_level)
printfln("Error: unknown lispval type\n"); printfln("Error: unknown lispval type\n");
// printfln("%s", v->sym); // printfln("%s", v->sym);
} }
if(VERBOSE) printfln("Freeing indent"); if(VERBOSE > 1) printfln("Freeing indent");
if (indent!=NULL) free(indent); if (indent!=NULL) free(indent);
indent = NULL; indent = NULL;
if(VERBOSE) printfln("Freed indent"); if(VERBOSE > 1) printfln("Freed indent");
} }
void print_lispval_parenthesis(lispval* v) void print_lispval_parenthesis(lispval* v)
@ -598,6 +598,29 @@ lispval* builtin_join(lispval* l, lispenv* e)
// Returns something that is independent of the input: yes. // Returns something that is independent of the input: yes.
} }
// Define a variable
lispval* builtin_def(lispval* v, lispenv* env){
// Takes one argument: def { { a b } { 1 2 } }
lispval* source = v->cell[0];
LISPVAL_ASSERT(v->count == 1, "Error: function def passed too many arguments");
LISPVAL_ASSERT(source->type == LISPVAL_QEXPR, "Error: Argument passed to def is not a q-expr, i.e., a bracketed list.");
LISPVAL_ASSERT(source->count == 2, "Error: Argument passed to def should be a q expr with two q expressions as children: def { { a b } { 1 2 } } ");
LISPVAL_ASSERT(source->cell[0]->type == LISPVAL_QEXPR, "Error: Argument passed to def should be a q expr with two q expressions as children: def { { a b } { 1 2 } } ");
LISPVAL_ASSERT(source->cell[1]->type == LISPVAL_QEXPR, "Error: Argument passed to def should be a q expr with two q expressions as children: def { { a b } { 1 2 } } ");
LISPVAL_ASSERT(source->cell[0]->count == source->cell[1]->count, "Error: In function \"def\" both subarguments should have the same length");
lispval* symbols = source->cell[0];
lispval* values = source->cell[1];
for(int i; i < symbols->count; i++){
LISPVAL_ASSERT(symbols->cell[i]->type == LISPVAL_SYM, "Error: in function def, the first list of items should be of type symbol: def { { a b } { 1 2 } }");
if(VERBOSE) print_lispval_tree(symbols, 0);
if(VERBOSE) print_lispval_tree(values, 0);
if(VERBOSE) printf("\n");
insert_in_lispenv(symbols->cell[i]->sym, values->cell[i], env);
}
return lispval_sexpr(); // ()
}
// Simple math ops // Simple math ops
lispval* builtin_math_ops(char* op, lispval* v, lispenv* e) lispval* builtin_math_ops(char* op, lispval* v, lispenv* e)
{ {
@ -711,6 +734,7 @@ void lispenv_add_builtins(lispenv* env){
lispenv_add_builtin("tail", builtin_tail, env); lispenv_add_builtin("tail", builtin_tail, env);
lispenv_add_builtin("eval", builtin_eval, env); lispenv_add_builtin("eval", builtin_eval, env);
lispenv_add_builtin("join", builtin_join, env); lispenv_add_builtin("join", builtin_join, env);
lispenv_add_builtin("def", builtin_def, env);
} }
// Evaluate the lispval // Evaluate the lispval