env.h File Reference

#include "lbm_types.h"

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Macros
#define	GLOBAL_ENV_ROOTS   32
#define	GLOBAL_ENV_MASK   0x1F

Functions
int	lbm_init_env (void)
lbm_value *	lbm_get_global_env (void)
lbm_value	lbm_env_copy_spine (lbm_value env)
bool	lbm_env_lookup_b (lbm_value *res, lbm_value sym, lbm_value env)
bool	lbm_global_env_lookup (lbm_value *res, lbm_value sym)
lbm_value	lbm_env_lookup (lbm_value sym, lbm_value env)
lbm_value	lbm_env_set (lbm_value env, lbm_value key, lbm_value val)
lbm_value	lbm_env_set_functional (lbm_value env, lbm_value key, lbm_value val)
lbm_value	lbm_env_modify_binding (lbm_value env, lbm_value key, lbm_value val)
lbm_value	lbm_env_drop_binding (lbm_value env, lbm_value key)

Macro Definition Documentation

GLOBAL_ENV_MASK

#define GLOBAL_ENV_MASK   0x1F

GLOBAL_ENV_ROOTS

#define GLOBAL_ENV_ROOTS   32

Function Documentation

lbm_env_copy_spine()

lbm_value lbm_env_copy_spine

(

lbm_value

env

)

Copy the spine of an environment. The list structure is recreated but the values themselves are not copied but rather just referenced.

Parameters

env	Environment to copy.

Returns

Copy of environment.

lbm_env_drop_binding()

lbm_value lbm_env_drop_binding	(	lbm_value	env,
		lbm_value	key
	)

Removes a binding (destructively) from the input environment.

Parameters

env	Environment to modify.
key	Key to remove from environment.

Returns

Updated environment or not_found symbol.

lbm_env_lookup()

lbm_value lbm_env_lookup	(	lbm_value	sym,
		lbm_value	env
	)

Lookup a value in from the global environment.

Parameters

sym	The key to look for in the environment
env	The environment to search for the key.

Returns

The value bound to key or lbm_enc_sym(SYM_NOT_FOUND).

lbm_env_lookup_b()

bool lbm_env_lookup_b	(	lbm_value *	res,
		lbm_value	sym,
		lbm_value	env
	)

Lookup a value in an environment.

Parameters

res	Result stored here
sym	The key to look for in the environment
env	The environment to search for the key.

Returns

True on success or false otherwise.

lbm_env_modify_binding()

lbm_value lbm_env_modify_binding	(	lbm_value	env,
		lbm_value	key,
		lbm_value	val
	)

Modifies an existing binding on the environment.

Parameters

env	The environment to modify.
key	The key.
val	The new value to associate with the key.

Returns

The modified environment of Success and lbm_enc_sym(SYM_NOT_FOUND) if the key does not exist.

lbm_env_set()

lbm_value lbm_env_set	(	lbm_value	env,
		lbm_value	key,
		lbm_value	val
	)

Create a new binding on the environment or replace an old binding.

Parameters

env	Environment to modify.
key	A symbol to associate with a value.
val	The value.

Returns

The modified environment or lbm_enc_sym(SYM_MERROR) if GC needs to be run.

lbm_env_set_functional()

lbm_value lbm_env_set_functional	(	lbm_value	env,
		lbm_value	key,
		lbm_value	val
	)

Create a new binding on the environment without destroying the old value. If the old value is unused (the key-value pair) it will be freed by GC at next convenience.

Parameters

env	Environment to modify.
key	A symbol to associate with a value.
val	The value.

Returns

The modified environment or lbm_enc_sym(SYM_MERROR) if GC needs to be run.

lbm_get_global_env()

lbm_value* lbm_get_global_env

(

void

)

Returns

the global environment

lbm_global_env_lookup()

bool lbm_global_env_lookup	(	lbm_value *	res,
		lbm_value	sym
	)

Lookup a value in the global environment.

Parameters

res	Result stored here
sym	The key to look for in the environment
env	The environment to search for the key.

Returns

True on success or false otherwise.

lbm_init_env()

int lbm_init_env

(

void

)

Initialize the global environment. This sets the global environment to NIL

Returns

1