74 lines
2.8 KiB
C
74 lines
2.8 KiB
C
// Optional types
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#include <pthread.h>
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#include "bools.h"
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#include "datatypes.h"
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#include "integers.h"
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#include "metamethods.h"
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#include "threads.h"
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#include "text.h"
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#include "util.h"
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public const Array_t NULL_ARRAY = {.length=-1};
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public const OptionalBool_t NULL_BOOL = 2;
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public const Int_t NULL_INT = {.small=0};
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public const Table_t NULL_TABLE = {.entries.length=-1};
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public const Closure_t NULL_CLOSURE = {.fn=NULL};
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public const Text_t NULL_TEXT = {.length=-1};
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public PUREFUNC bool is_null(const void *obj, const TypeInfo *non_optional_type)
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{
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if (non_optional_type == &Int$info)
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return ((Int_t*)obj)->small == 0;
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else if (non_optional_type == &Bool$info)
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return *((OptionalBool_t*)obj) == NULL_BOOL;
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else if (non_optional_type == &Num$info)
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return isnan(*((Num_t*)obj));
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else if (non_optional_type == &Int64$info)
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return ((OptionalInt64_t*)obj)->is_null;
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else if (non_optional_type == &Int32$info)
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return ((OptionalInt32_t*)obj)->is_null;
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else if (non_optional_type == &Int16$info)
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return ((OptionalInt16_t*)obj)->is_null;
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else if (non_optional_type == &Int8$info)
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return ((OptionalInt8_t*)obj)->is_null;
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else if (non_optional_type == &Thread)
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return *(pthread_t**)obj == NULL;
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switch (non_optional_type->tag) {
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case ChannelInfo: return *(Channel_t**)obj == NULL;
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case PointerInfo: return *(void**)obj == NULL;
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case TextInfo: return ((Text_t*)obj)->length < 0;
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case ArrayInfo: return ((Array_t*)obj)->length < 0;
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case TableInfo: return ((Table_t*)obj)->entries.length < 0;
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case FunctionInfo: return *(void**)obj == NULL;
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case StructInfo: {
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int64_t offset = non_optional_type->size;
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if (offset % non_optional_type->align)
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offset += non_optional_type->align - (offset % non_optional_type->align);
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return *(bool*)(obj + offset);
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}
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case EnumInfo: return (*(int*)obj) == 0; // NULL tag
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case CStringInfo: return (*(char**)obj) == NULL;
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default: {
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Text_t t = generic_as_text(NULL, false, non_optional_type);
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errx(1, "is_null() not implemented for: %k", &t);
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}
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}
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}
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#pragma GCC diagnostic ignored "-Wstack-protector"
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public Text_t Optional$as_text(const void *obj, bool colorize, const TypeInfo *type)
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{
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if (!obj)
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return Text$concat(generic_as_text(obj, colorize, type->OptionalInfo.type), Text("?"));
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if (is_null(obj, type->OptionalInfo.type))
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return Text$concat(colorize ? Text("\x1b[31m!") : Text("!"), generic_as_text(NULL, false, type->OptionalInfo.type),
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colorize ? Text("\x1b[m") : Text(""));
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return Text$concat(generic_as_text(obj, colorize, type->OptionalInfo.type), colorize ? Text("\x1b[33m?\x1b[m") : Text("?"));
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}
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// vim: ts=4 sw=0 et cino=L2,l1,(0,W4,m1
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