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core: Add lookup_variable_, lookup_variable, lookup_ref. 

* src/variable.c (lookup_variable, lookup_ref): New builtins, and
(lookup_variable_): New function.
* include/mes/builtins.h: Declare them.
* include/mes/mes.h: Declare it.
* src/builtins.c (mes_builtins): Register them.
This commit is contained in:
Jan Nieuwenhuizen 2019-11-14 09:50:52 +01:00 committed by Jan (janneke) Nieuwenhuizen
parent 3976cad232
commit 1758db381f
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GPG Key ID: F3C1A0D9C1D65273
4 changed files with 37 additions and 0 deletions
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2
include/mes/builtins.h
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@ -178,6 +178,8 @@ struct scm *struct_set_x (struct scm *x, struct scm *i, struct scm *e);
struct scm *variable_ref (struct scm *var);
struct scm *variable_set_x (struct scm *var, struct scm *value);
struct scm *variable_bound_p (struct scm *var);
struct scm *lookup_variable (struct scm *lookup, struct scm *name, struct scm *define_p);
struct scm *lookup_ref (struct scm *lookup, struct scm *name);
/* src/vector.c */
struct scm *make_vector (struct scm *x);
struct scm *vector_length (struct scm *x);

1
include/mes/mes.h
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@ -127,6 +127,7 @@ struct scm *cell_ref (struct scm *cell, long index);
struct scm *fdisplay_ (struct scm *, int, int);
struct scm *init_symbols ();
struct scm *init_time (struct scm *a);
struct scm *lookup_variable_ (struct scm *lookup, char const* name);
struct scm *make_builtin_type ();
struct scm *make_bytes (char const *s, size_t length);
struct scm *make_cell (long type, struct scm *car, struct scm *cdr);

2
src/builtins.c
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@ -288,6 +288,8 @@ mes_builtins (struct scm *a) /*:((internal)) */
a = init_builtin (builtin_type, "variable-ref", 1, &variable_ref, a);
a = init_builtin (builtin_type, "variable-set!", 2, &variable_set_x, a);
a = init_builtin (builtin_type, "variable-bound?", 1, &variable_bound_p, a);
a = init_builtin (builtin_type, "lookup-variable", 3, &lookup_variable, a);
a = init_builtin (builtin_type, "lookup-ref", 2, &lookup_ref, a);
/* src/vector.c */
a = init_builtin (builtin_type, "make-vector", -1, &make_vector, a);
a = init_builtin (builtin_type, "vector-length", 1, &vector_length, a);

32
src/variable.c
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@ -48,3 +48,35 @@ variable_bound_p (struct scm *var)
return cell_t;
return cell_f;
}
struct scm *
lookup_variable (struct scm *lookup, struct scm *name, struct scm *define_p)
{
struct scm *handle = cell_f;
if (lookup->type = TPAIR)
handle = assq (name, lookup);
if (handle == cell_f)
{
handle = hashq_get_handle_ (M0, name, cell_f);
if (handle == cell_f && define_p == cell_t)
handle = hashq_set_handle_x (M0, name, cell_f);
}
return handle;
}
struct scm *
lookup_variable_ (struct scm *lookup, char const* name)
{
return lookup_variable (lookup, cstring_to_symbol (name), cell_f);
}
struct scm *
lookup_ref (struct scm *lookup, struct scm *name)
{
struct scm *x = lookup_variable (lookup, name, cell_f);
if (x == cell_f)
error (cell_symbol_unbound_variable, name);
return x->cdr;
}