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748fb5f91c44da3dd3611691e1305268cb896bd5
akbasic/src/environment.c
Tachikoma 748fb5f91c Honour a subscript in SSHAPE and GSHAPE 
`shape_variable()` took the identifier off the leaf and looked the variable up
without ever evaluating the subscript, and both verbs then addressed element
zero with a literal. So `SSHAPE SH$(2), ...` wrote the handle into `SH$(0)` and
`GSHAPE SH$(2)` stamped whatever was in `SH$(0)`.

Ordinary assignment and `PRINT` honour the subscript, which is what made this
expensive: a program keeping several saved shapes in an array got every one of
them resolving to the same element, silently, and the only symptom was that
every stamp came out as the last shape captured. The Breakout in examples/ keeps
its six brick stamps in six separate scalars for exactly this reason.

`SPRSAV` was the counter-example and is the model -- it evaluates its argument
and handles an array element correctly. The subscript resolution itself is now
shared: `collect_subscripts()` comes out of src/environment.c as
`akbasic_environment_collect_subscripts()`, so a verb taking a variable by name
resolves a subscript the same way assignment does rather than each verb deciding
for itself.

tests/graphics_verbs.c covers TODO.md's reduction -- which used to print
"[SHAPE:0] []" and now prints "[] [SHAPE:0]" -- and the case a program actually
wants: two shapes captured into two elements, each stamped back through its own,
asserted against the device log so a fix that merely made the strings look right
would not pass.

Chapter 18's trap 4 becomes history, and Chapter 6 says an array works.

TODO.md section 9 item 6, struck.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
Co-Authored-By: Andrew Kesterson <andrew@aklabs.net>
2026-08-02 00:10:24 -04:00

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/**
* @file environment.c
* @brief Implements the scope and per-line working state.
*/
#include <inttypes.h>
#include <string.h>
#include <akerror.h>
#include <akbasic/environment.h>
#include <akbasic/error.h>
#include <akbasic/runtime.h>
akerr_ErrorContext *akbasic_environment_init(akbasic_Environment *obj, akbasic_Runtime *runtime, akbasic_Environment *parent)
{
PREPARE_ERROR(errctx);
FAIL_ZERO_RETURN(errctx, (obj != NULL), AKERR_NULLPOINTER, "NULL environment in init");
FAIL_ZERO_RETURN(errctx, (runtime != NULL), AKERR_NULLPOINTER, "NULL runtime in environment init");
PASS(errctx, akbasic_symtab_init(&obj->variables, AKBASIC_MAX_VARIABLES));
PASS(errctx, akbasic_symtab_init(&obj->functions, AKBASIC_MAX_FUNCTIONS));
PASS(errctx, akbasic_symtab_init(&obj->labels, AKBASIC_MAX_LABELS));
obj->parent = parent;
obj->runtime = runtime;
obj->forNextVariable = NULL;
obj->forStepLeaf = NULL;
obj->forToLeaf = NULL;
obj->loopFirstLine = 0;
obj->loopExitLine = 0;
obj->exiting = false;
obj->doConditionLeaf = NULL;
obj->doConditionKind = AKBASIC_LOOPCOND_NONE;
obj->isDoLoop = false;
obj->gosubReturnLine = 0;
obj->readReturnLine = 0;
obj->readIdentifierIdx = 0;
obj->waitingForCommand[0] = '\0';
obj->errorToken = NULL;
memset(obj->readIdentifierLeaves, 0, sizeof(obj->readIdentifierLeaves));
obj->doLeafPool.next = 0;
obj->doLeafPool.capacity = AKBASIC_MAX_CONDITION_LEAVES;
obj->doLeafPool.leaves = obj->doLeafStorage;
obj->readLeafPool.next = 0;
obj->readLeafPool.capacity = AKBASIC_MAX_LEAVES;
obj->readLeafPool.leaves = obj->readLeafStorage;
PASS(errctx, akbasic_value_zero(&obj->forStepValue));
PASS(errctx, akbasic_value_zero(&obj->forToValue));
PASS(errctx, akbasic_value_zero(&obj->returnValue));
if ( obj->parent != NULL ) {
obj->lineno = obj->parent->lineno;
obj->nextline = obj->parent->nextline;
} else {
obj->lineno = 0;
obj->nextline = 0;
}
obj->nextvalue = 0;
PASS(errctx, akbasic_environment_zero_parser(obj));
SUCCEED_RETURN(errctx);
}
akerr_ErrorContext *akbasic_environment_zero(akbasic_Environment *obj)
{
PREPARE_ERROR(errctx);
int i = 0;
FAIL_ZERO_RETURN(errctx, (obj != NULL), AKERR_NULLPOINTER, "NULL environment in zero");
for ( i = 0; i < AKBASIC_MAX_VALUES; i++ ) {
PASS(errctx, akbasic_value_init(&obj->values[i]));
}
obj->nextvalue = 0;
SUCCEED_RETURN(errctx);
}
akerr_ErrorContext *akbasic_environment_zero_parser(akbasic_Environment *obj)
{
PREPARE_ERROR(errctx);
int i = 0;
FAIL_ZERO_RETURN(errctx, (obj != NULL), AKERR_NULLPOINTER, "NULL environment in zero_parser");
for ( i = 0; i < AKBASIC_MAX_LEAVES; i++ ) {
PASS(errctx, akbasic_leaf_init(&obj->leaves[i], AKBASIC_LEAF_UNDEFINED));
}
for ( i = 0; i < AKBASIC_MAX_TOKENS; i++ ) {
PASS(errctx, akbasic_token_init(&obj->tokens[i]));
}
obj->curtoken = 0;
obj->nexttoken = 0;
obj->nextleaf = 0;
SUCCEED_RETURN(errctx);
}
akerr_ErrorContext *akbasic_environment_new_value(akbasic_Environment *obj, akbasic_Value **dest)
{
PREPARE_ERROR(errctx);
FAIL_ZERO_RETURN(errctx, (obj != NULL && dest != NULL), AKERR_NULLPOINTER,
"NULL argument in new_value");
FAIL_ZERO_RETURN(errctx, (obj->nextvalue < AKBASIC_MAX_VALUES), AKBASIC_ERR_BOUNDS,
"Maximum values per line reached");
*dest = &obj->values[obj->nextvalue];
obj->nextvalue += 1;
SUCCEED_RETURN(errctx);
}
akerr_ErrorContext *akbasic_environment_new_leaf(akbasic_Environment *obj, akbasic_ASTLeaf **dest)
{
PREPARE_ERROR(errctx);
FAIL_ZERO_RETURN(errctx, (obj != NULL && dest != NULL), AKERR_NULLPOINTER,
"NULL argument in new_leaf");
FAIL_ZERO_RETURN(errctx, (obj->nextleaf < AKBASIC_MAX_LEAVES), AKBASIC_ERR_BOUNDS,
"No more leaves available");
*dest = &obj->leaves[obj->nextleaf];
obj->nextleaf += 1;
SUCCEED_RETURN(errctx);
}
akerr_ErrorContext *akbasic_environment_wait_for_command(akbasic_Environment *obj, const char *command)
{
PREPARE_ERROR(errctx);
FAIL_ZERO_RETURN(errctx, (obj != NULL && command != NULL), AKERR_NULLPOINTER,
"NULL argument in wait_for_command");
/*
* The reference panics here. An interpreter library may not take the process
* with it, so this raises instead -- but it is still a hard failure, because
* two pending waits in one environment means the block structure is already
* corrupt.
*/
FAIL_NONZERO_RETURN(errctx, (obj->waitingForCommand[0] != '\0'), AKBASIC_ERR_STATE,
"Can't wait on multiple commands in the same environment : %s",
obj->waitingForCommand);
FAIL_ZERO_RETURN(errctx, (strlen(command) < sizeof(obj->waitingForCommand)),
AKBASIC_ERR_BOUNDS, "Command name '%s' is too long to wait on", command);
strncpy(obj->waitingForCommand, command, sizeof(obj->waitingForCommand) - 1);
obj->waitingForCommand[sizeof(obj->waitingForCommand) - 1] = '\0';
SUCCEED_RETURN(errctx);
}
bool akbasic_environment_is_waiting_for_any(akbasic_Environment *obj)
{
if ( obj == NULL ) {
return false;
}
if ( obj->waitingForCommand[0] != '\0' ) {
return true;
}
return akbasic_environment_is_waiting_for_any(obj->parent);
}
bool akbasic_environment_is_waiting_for(akbasic_Environment *obj, const char *command)
{
if ( obj == NULL || command == NULL ) {
return false;
}
if ( strcmp(obj->waitingForCommand, command) == 0 ) {
return true;
}
return akbasic_environment_is_waiting_for(obj->parent, command);
}
akerr_ErrorContext *akbasic_environment_stop_waiting(akbasic_Environment *obj, const char *command)
{
PREPARE_ERROR(errctx);
FAIL_ZERO_RETURN(errctx, (obj != NULL && command != NULL), AKERR_NULLPOINTER,
"NULL argument in stop_waiting");
/*
* The reference ignores `command` and clears unconditionally, which lets an
* inner block clear an outer block's wait (TODO.md section 12 item 3). The
* argument is honoured here only to the extent of walking to the environment
* that is actually waiting for it -- clearing the wrong one outright would
* change observable control flow, so the search stops at the first match and
* a miss is silently tolerated, exactly as today.
*/
while ( obj != NULL ) {
if ( strcmp(obj->waitingForCommand, command) == 0 ) {
obj->waitingForCommand[0] = '\0';
SUCCEED_RETURN(errctx);
}
obj = obj->parent;
}
SUCCEED_RETURN(errctx);
}
akerr_ErrorContext *akbasic_environment_get_function(akbasic_Environment *obj, const char *fname, void **dest)
{
PREPARE_ERROR(errctx);
char upper[AKBASIC_SYMTAB_MAX_KEY];
size_t i = 0;
size_t len = 0;
FAIL_ZERO_RETURN(errctx, (obj != NULL && fname != NULL && dest != NULL), AKERR_NULLPOINTER,
"NULL argument in get_function");
len = strlen(fname);
FAIL_ZERO_RETURN(errctx, (len < sizeof(upper)), AKERR_KEY, "Function '%s' is not defined", fname);
for ( i = 0; i < len; i++ ) {
char c = fname[i];
upper[i] = (char)((c >= 'a' && c <= 'z') ? (c - 'a' + 'A') : c);
}
upper[len] = '\0';
while ( obj != NULL ) {
akerr_ErrorContext *found = akbasic_symtab_get(&obj->functions, upper, dest, NULL);
if ( found == NULL ) {
SUCCEED_RETURN(errctx);
}
found->handled = true;
IGNORE(akerr_release_error(found));
obj = obj->parent;
}
FAIL_RETURN(errctx, AKERR_KEY, "Function '%s' is not defined", fname);
}
akerr_ErrorContext *akbasic_environment_get_label(akbasic_Environment *obj, const char *label, int64_t *dest)
{
PREPARE_ERROR(errctx);
FAIL_ZERO_RETURN(errctx, (obj != NULL && label != NULL && dest != NULL), AKERR_NULLPOINTER,
"NULL argument in get_label");
while ( obj != NULL ) {
akerr_ErrorContext *found = akbasic_symtab_get(&obj->labels, label, NULL, dest);
if ( found == NULL ) {
SUCCEED_RETURN(errctx);
}
found->handled = true;
IGNORE(akerr_release_error(found));
obj = obj->parent;
}
FAIL_RETURN(errctx, AKBASIC_ERR_UNDEFINED,
"Unable to find or create label %s in environment", label);
}
akerr_ErrorContext *akbasic_environment_set_label(akbasic_Environment *obj, const char *label, int64_t value)
{
PREPARE_ERROR(errctx);
FAIL_ZERO_RETURN(errctx, (obj != NULL && label != NULL), AKERR_NULLPOINTER,
"NULL argument in set_label");
/* Only the top-level environment creates labels. */
while ( obj != NULL && obj->runtime->environment != obj ) {
obj = obj->parent;
}
FAIL_ZERO_RETURN(errctx, (obj != NULL), AKBASIC_ERR_ENVIRONMENT,
"Unable to create label in orphaned environment");
PASS(errctx, akbasic_symtab_set(&obj->labels, label, NULL, value));
SUCCEED_RETURN(errctx);
}
akerr_ErrorContext *akbasic_environment_get(akbasic_Environment *obj, const char *varname, akbasic_Variable **dest)
{
PREPARE_ERROR(errctx);
akbasic_Environment *walk = NULL;
void *slot = NULL;
FAIL_ZERO_RETURN(errctx, (obj != NULL && varname != NULL && dest != NULL), AKERR_NULLPOINTER,
"NULL argument in environment get");
*dest = NULL;
for ( walk = obj; walk != NULL; walk = walk->parent ) {
akerr_ErrorContext *found = akbasic_symtab_get(&walk->variables, varname, &slot, NULL);
if ( found == NULL ) {
*dest = (akbasic_Variable *)slot;
SUCCEED_RETURN(errctx);
}
found->handled = true;
IGNORE(akerr_release_error(found));
}
/*
* Parents do not create variables for their children: only the currently
* active environment auto-creates. A miss anywhere else returns NULL without
* error, which the caller is expected to notice.
*/
if ( obj->runtime->environment != obj ) {
SUCCEED_RETURN(errctx);
}
PASS(errctx, akbasic_environment_create(obj, varname, dest));
SUCCEED_RETURN(errctx);
}
akerr_ErrorContext *akbasic_environment_create(akbasic_Environment *obj, const char *varname, akbasic_Variable **dest)
{
PREPARE_ERROR(errctx);
akbasic_Variable *variable = NULL;
int64_t sizes[1] = { 1 };
void *slot = NULL;
akerr_ErrorContext *found = NULL;
FAIL_ZERO_RETURN(errctx, (obj != NULL && varname != NULL && dest != NULL), AKERR_NULLPOINTER,
"NULL argument in environment create");
/*
* This scope only. Unlike akbasic_environment_get() there is no walk up the
* parent chain: the caller has already said *which* scope it means, and
* finding an outer one would put the variable somewhere other than where it
* was asked for.
*/
*dest = NULL;
found = akbasic_symtab_get(&obj->variables, varname, &slot, NULL);
if ( found == NULL ) {
*dest = (akbasic_Variable *)slot;
SUCCEED_RETURN(errctx);
}
found->handled = true;
IGNORE(akerr_release_error(found));
PASS(errctx, akbasic_runtime_new_variable(obj->runtime, &variable));
FAIL_ZERO_RETURN(errctx, (strlen(varname) < sizeof(variable->name)), AKBASIC_ERR_BOUNDS,
"Variable name '%s' is too long", varname);
strncpy(variable->name, varname, sizeof(variable->name) - 1);
variable->name[sizeof(variable->name) - 1] = '\0';
variable->valuetype = AKBASIC_TYPE_UNDEFINED;
variable->mutable_ = true;
PASS(errctx, akbasic_variable_init(variable, &obj->runtime->valuepool, sizes, 1));
PASS(errctx, akbasic_symtab_set(&obj->variables, varname, variable, 0));
*dest = variable;
SUCCEED_RETURN(errctx);
}
/*
* Evaluate an lvalue's subscript list, if it has one, into `subscripts`. A bare
* identifier yields the single subscript {0}, which is how a scalar is addressed
* -- every variable is really a one-element array.
*/
akerr_ErrorContext *akbasic_environment_collect_subscripts(akbasic_Environment *obj, akbasic_ASTLeaf *lval, int64_t *subscripts, int *count)
{
PREPARE_ERROR(errctx);
akbasic_ASTLeaf *expr = NULL;
akbasic_Value *tval = NULL;
FAIL_ZERO_RETURN(errctx, (obj != NULL && lval != NULL && subscripts != NULL && count != NULL),
AKERR_NULLPOINTER, "NULL argument in collect_subscripts");
*count = 0;
if ( lval->expr != NULL &&
lval->expr->leaftype == AKBASIC_LEAF_ARGUMENTLIST &&
lval->expr->operator_ == AKBASIC_TOK_ARRAY_SUBSCRIPT ) {
for ( expr = lval->expr->right; expr != NULL; expr = expr->next ) {
FAIL_ZERO_RETURN(errctx, (*count < AKBASIC_MAX_ARRAY_DEPTH), AKBASIC_ERR_BOUNDS,
"More than %d array subscripts", AKBASIC_MAX_ARRAY_DEPTH);
PASS(errctx, akbasic_runtime_evaluate(obj->runtime, expr, &tval));
FAIL_NONZERO_RETURN(errctx, (tval->valuetype != AKBASIC_TYPE_INTEGER),
AKBASIC_ERR_TYPE,
"Array dimensions must evaluate to integer (B)");
subscripts[*count] = tval->intval;
*count += 1;
}
}
if ( *count == 0 ) {
subscripts[0] = 0;
*count = 1;
}
SUCCEED_RETURN(errctx);
}
/**
* @brief Assign into a field, checking the field's declared type as it goes.
*
* The type check is the same one a variable gets, and it comes from the same
* place: the field's suffix said what it holds when the TYPE was declared. What
* is different is that a *field* name is checked for existence at all, which a
* variable name never is -- the set of fields is closed and written down, and
* akbasic_structtype_field() lists them when one is missed.
*/
static akerr_ErrorContext *assign_field(akbasic_Environment *obj, akbasic_ASTLeaf *lval,
akbasic_Value *rval, akbasic_Value **dest)
{
PREPARE_ERROR(errctx);
akbasic_StructField *field = NULL;
akbasic_Value *slot = NULL;
void *hostbase = NULL;
PASS(errctx, akbasic_struct_resolve(obj->runtime, lval, &field, &slot, &hostbase));
switch ( field->kind ) {
case AKBASIC_FIELD_STRUCT:
FAIL_ZERO_RETURN(errctx, (rval->valuetype == AKBASIC_TYPE_STRUCT), AKBASIC_ERR_TYPE,
"Incompatible types in assignment to %s", field->name);
FAIL_ZERO_RETURN(errctx, (rval->structtype == field->typeindex), AKBASIC_ERR_TYPE,
"%s is a %s and cannot be assigned a %s", field->name,
obj->runtime->structtypes.types[field->typeindex].name,
obj->runtime->structtypes.types[rval->structtype].name);
PASS(errctx, akbasic_struct_copy(obj->runtime, field->typeindex, rval->structbase, slot));
break;
case AKBASIC_FIELD_POINTER:
FAIL_ZERO_RETURN(errctx, (rval->valuetype == AKBASIC_TYPE_POINTER), AKBASIC_ERR_TYPE,
"%s is a pointer; POINT it AT a structure rather than assigning one to it",
field->name);
FAIL_ZERO_RETURN(errctx, (rval->structtype == field->typeindex), AKBASIC_ERR_TYPE,
"%s points to %s and cannot hold a pointer to %s", field->name,
obj->runtime->structtypes.types[field->typeindex].name,
obj->runtime->structtypes.types[rval->structtype].name);
PASS(errctx, akbasic_value_clone(rval, slot));
break;
default:
if ( field->valuetype == AKBASIC_TYPE_INTEGER && rval->valuetype == AKBASIC_TYPE_FLOAT ) {
PASS(errctx, akbasic_value_zero(slot));
slot->valuetype = AKBASIC_TYPE_INTEGER;
slot->intval = (int64_t)rval->floatval;
break;
}
if ( field->valuetype == AKBASIC_TYPE_FLOAT && rval->valuetype == AKBASIC_TYPE_INTEGER ) {
PASS(errctx, akbasic_value_zero(slot));
slot->valuetype = AKBASIC_TYPE_FLOAT;
slot->floatval = (double)rval->intval;
break;
}
FAIL_ZERO_RETURN(errctx, (rval->valuetype == field->valuetype), AKBASIC_ERR_TYPE,
"Incompatible types in assignment to %s", field->name);
PASS(errctx, akbasic_value_clone(rval, slot));
break;
}
/*
* And straight back into the host's own memory, so `FOE@.HP# = 0` changes
* the game's enemy rather than a copy of it. The conversion refuses what
* will not fit -- an int16_t field handed 70000 is an error naming the
* field, because a silent wrap is found three frames later in code that did
* nothing wrong.
*/
if ( hostbase != NULL && field->kind == AKBASIC_FIELD_PRIMITIVE ) {
PASS(errctx, akbasic_host_write_field(obj->runtime, field, hostbase, slot));
}
*dest = slot;
SUCCEED_RETURN(errctx);
}
akerr_ErrorContext *akbasic_environment_assign(akbasic_Environment *obj, akbasic_ASTLeaf *lval, akbasic_Value *rval, akbasic_Value **dest)
{
PREPARE_ERROR(errctx);
akbasic_Variable *variable = NULL;
int64_t subscripts[AKBASIC_MAX_ARRAY_DEPTH];
int subscriptcount = 0;
akbasic_Value *slot = NULL;
FAIL_ZERO_RETURN(errctx, (obj != NULL && lval != NULL && rval != NULL && dest != NULL),
AKERR_NULLPOINTER, "nil pointer");
/*
* A field is addressed by walking the chain, not by looking a name up in a
* scope -- `E@.POS@.X#` names no variable called `X#`. So it is resolved and
* assigned here, before the by-name lookup the rest of this function does.
*/
if ( lval->leaftype == AKBASIC_LEAF_FIELD ) {
PASS(errctx, assign_field(obj, lval, rval, dest));
SUCCEED_RETURN(errctx);
}
PASS(errctx, akbasic_environment_get(obj, lval->identifier, &variable));
FAIL_ZERO_RETURN(errctx, (variable != NULL), AKBASIC_ERR_UNDEFINED,
"Identifier %s is undefined", lval->identifier);
PASS(errctx, akbasic_environment_collect_subscripts(obj, lval, subscripts, &subscriptcount));
/*
* Resolve the slot before the type switch. The reference notes that moving
* this below the switch corrupts the subscript list; here it is simply the
* clearer order, and the returned pointer is what an assignment expression
* evaluates to.
*/
PASS(errctx, akbasic_variable_get_subscript(variable, subscripts, subscriptcount, &slot));
switch ( lval->leaftype ) {
case AKBASIC_LEAF_IDENTIFIER_STRUCT:
/*
* **This is the whole of copy-on-assign**, and it has to happen here
* rather than in akbasic_value_clone(): a clone copies one slot, and one
* slot holds a *reference* to an instance rather than the instance. Going
* through clone would therefore alias -- exactly the reference semantics
* the language does not have -- so a structure is intercepted before it
* reaches that path and its slots are copied one at a time.
*
* A pointer variable is the opposite and takes the clone: copying a
* pointer copies the reference, which is what makes `POINT` the only way
* to share and assignment always a copy.
*/
FAIL_ZERO_RETURN(errctx, (variable->structtype >= 0), AKBASIC_ERR_STATE,
"%s has not been DIMmed AS a type", lval->identifier);
if ( variable->ispointer ) {
FAIL_ZERO_RETURN(errctx, (rval->valuetype == AKBASIC_TYPE_POINTER),
AKBASIC_ERR_TYPE,
"%s is a pointer; POINT it AT a structure rather than assigning one to it",
lval->identifier);
FAIL_ZERO_RETURN(errctx, (rval->structtype == variable->structtype),
AKBASIC_ERR_TYPE,
"%s points to %s and cannot hold a pointer to %s",
lval->identifier,
obj->runtime->structtypes.types[variable->structtype].name,
obj->runtime->structtypes.types[rval->structtype].name);
PASS(errctx, akbasic_value_clone(rval, slot));
break;
}
FAIL_ZERO_RETURN(errctx, (rval->valuetype == AKBASIC_TYPE_STRUCT), AKBASIC_ERR_TYPE,
"Incompatible types in variable assignment");
FAIL_ZERO_RETURN(errctx, (rval->structtype == variable->structtype), AKBASIC_ERR_TYPE,
"%s is a %s and cannot be assigned a %s",
lval->identifier,
obj->runtime->structtypes.types[variable->structtype].name,
obj->runtime->structtypes.types[rval->structtype].name);
PASS(errctx, akbasic_struct_copy(obj->runtime, variable->structtype,
rval->structbase, slot));
*dest = slot;
SUCCEED_RETURN(errctx);
case AKBASIC_LEAF_IDENTIFIER_INT:
if ( rval->valuetype == AKBASIC_TYPE_INTEGER ) {
PASS(errctx, akbasic_variable_set_integer(variable, rval->intval, subscripts, subscriptcount));
} else if ( rval->valuetype == AKBASIC_TYPE_FLOAT ) {
PASS(errctx, akbasic_variable_set_integer(variable, (int64_t)rval->floatval, subscripts, subscriptcount));
} else {
FAIL_RETURN(errctx, AKBASIC_ERR_TYPE, "Incompatible types in variable assignment");
}
break;
case AKBASIC_LEAF_IDENTIFIER_FLOAT:
if ( rval->valuetype == AKBASIC_TYPE_INTEGER ) {
PASS(errctx, akbasic_variable_set_float(variable, (double)rval->intval, subscripts, subscriptcount));
} else if ( rval->valuetype == AKBASIC_TYPE_FLOAT ) {
PASS(errctx, akbasic_variable_set_float(variable, rval->floatval, subscripts, subscriptcount));
} else {
FAIL_RETURN(errctx, AKBASIC_ERR_TYPE, "Incompatible types in variable assignment");
}
break;
case AKBASIC_LEAF_IDENTIFIER_STRING:
FAIL_NONZERO_RETURN(errctx, (rval->valuetype != AKBASIC_TYPE_STRING), AKBASIC_ERR_TYPE,
"Incompatible types in variable assignment");
PASS(errctx, akbasic_variable_set_string(variable, rval->stringval, subscripts, subscriptcount));
break;
default:
FAIL_RETURN(errctx, AKBASIC_ERR_TYPE, "Invalid assignment");
}
variable->valuetype = rval->valuetype;
*dest = slot;
SUCCEED_RETURN(errctx);
}
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