mirror of
https://github.com/janet-lang/janet
synced 2025-10-24 20:27:41 +00:00
Refactor code. Separate code into different modules to
separate the minimum runtime from auxiliary functions. Change makefile to allow building static libraries.
This commit is contained in:
Calvin Rose
462
core/value.c
Normal file
462
core/value.c
Normal file
@@ -0,0 +1,462 @@
|
||||
#include <gst/util.h>
|
||||
#include <gst/value.h>
|
||||
#include <gst/ds.h>
|
||||
#include <gst/vm.h>
|
||||
#include <stdio.h>
|
||||
|
||||
/* Boolean truth definition */
|
||||
int gst_truthy(GstValue v) {
|
||||
return v.type != GST_NIL && !(v.type == GST_BOOLEAN && !v.data.boolean);
|
||||
}
|
||||
|
||||
static uint8_t *load_cstring(Gst *vm, const char *string, uint32_t len) {
|
||||
uint8_t *data = gst_alloc(vm, len + 1 + 2 * sizeof(uint32_t));
|
||||
data += 2 * sizeof(uint32_t);
|
||||
gst_string_hash(data) = 0;
|
||||
gst_string_length(data) = len;
|
||||
gst_memcpy(data, string, len);
|
||||
data[len] = 0;
|
||||
return data;
|
||||
}
|
||||
|
||||
GstValue gst_load_cstring(Gst *vm, const char *string) {
|
||||
GstValue ret;
|
||||
ret.type = GST_STRING;
|
||||
ret.data.string = load_cstring(vm, string, strlen(string));
|
||||
return ret;
|
||||
}
|
||||
|
||||
static uint8_t * number_to_string(Gst *vm, GstNumber x) {
|
||||
static const uint32_t SIZE = 20;
|
||||
uint8_t *data = gst_alloc(vm, SIZE + 1 + 2 * sizeof(uint32_t));
|
||||
data += 2 * sizeof(uint32_t);
|
||||
/* TODO - not depend on stdio */
|
||||
snprintf((char *) data, SIZE, "%.21g", x);
|
||||
gst_string_hash(data) = 0;
|
||||
gst_string_length(data) = strlen((char *) data);
|
||||
return data;
|
||||
}
|
||||
|
||||
static const char *HEX_CHARACTERS = "0123456789abcdef";
|
||||
#define HEX(i) (((uint8_t *) HEX_CHARACTERS)[(i)])
|
||||
|
||||
/* Returns a string description for a pointer */
|
||||
static uint8_t *string_description(Gst *vm, const char *title, uint32_t titlelen, void *pointer) {
|
||||
uint32_t len = 5 + titlelen + sizeof(void *) * 2;
|
||||
uint32_t i;
|
||||
uint8_t *data = gst_alloc(vm, len + 1 + 2 * sizeof(uint32_t));
|
||||
uint8_t *c;
|
||||
union {
|
||||
uint8_t bytes[sizeof(void *)];
|
||||
void *p;
|
||||
} buf;
|
||||
buf.p = pointer;
|
||||
data += 2 * sizeof(uint32_t);
|
||||
c = data;
|
||||
*c++ = '<';
|
||||
for (i = 0; i < titlelen; ++i) {
|
||||
*c++ = ((uint8_t *)title) [i];
|
||||
}
|
||||
*c++ = ' ';
|
||||
*c++ = '0';
|
||||
*c++ = 'x';
|
||||
for (i = sizeof(void *); i > 0; --i) {
|
||||
uint8_t byte = buf.bytes[i - 1];
|
||||
if (!byte) continue;
|
||||
*c++ = HEX(byte >> 4);
|
||||
*c++ = HEX(byte & 0xF);
|
||||
}
|
||||
*c++ = '>';
|
||||
gst_string_hash(data) = 0;
|
||||
gst_string_length(data) = c - data;
|
||||
*c = 0;
|
||||
return data;
|
||||
}
|
||||
|
||||
/* Returns a string pointer or NULL if could not allocate memory. */
|
||||
uint8_t *gst_to_string(Gst *vm, GstValue x) {
|
||||
switch (x.type) {
|
||||
case GST_NIL:
|
||||
return load_cstring(vm, "nil", 3);
|
||||
case GST_BOOLEAN:
|
||||
if (x.data.boolean) {
|
||||
return load_cstring(vm, "true", 4);
|
||||
} else {
|
||||
return load_cstring(vm, "false", 5);
|
||||
}
|
||||
case GST_NUMBER:
|
||||
return number_to_string(vm, x.data.number);
|
||||
case GST_ARRAY:
|
||||
return string_description(vm, "array", 5, x.data.pointer);
|
||||
case GST_TUPLE:
|
||||
return string_description(vm, "tuple", 5, x.data.pointer);
|
||||
case GST_OBJECT:
|
||||
return string_description(vm, "object", 6, x.data.pointer);
|
||||
case GST_STRING:
|
||||
return x.data.string;
|
||||
case GST_BYTEBUFFER:
|
||||
return string_description(vm, "buffer", 6, x.data.pointer);
|
||||
case GST_CFUNCTION:
|
||||
return string_description(vm, "cfunction", 9, x.data.pointer);
|
||||
case GST_FUNCTION:
|
||||
return string_description(vm, "function", 8, x.data.pointer);
|
||||
case GST_THREAD:
|
||||
return string_description(vm, "thread", 6, x.data.pointer);
|
||||
case GST_USERDATA:
|
||||
return string_description(vm, "userdata", 8, x.data.pointer);
|
||||
}
|
||||
return NULL;
|
||||
}
|
||||
|
||||
/* GST string version */
|
||||
uint32_t gst_string_calchash(const uint8_t *str) {
|
||||
return gst_cstring_calchash(str, gst_string_length(str));
|
||||
}
|
||||
|
||||
/* Simple hash function (djb2) */
|
||||
uint32_t gst_cstring_calchash(const uint8_t *str, uint32_t len) {
|
||||
const uint8_t *end = str + len;
|
||||
uint32_t hash = 5381;
|
||||
while (str < end)
|
||||
hash = (hash << 5) + hash + *str++;
|
||||
return hash;
|
||||
}
|
||||
|
||||
/* Simple hash function to get tuple hash */
|
||||
static uint32_t tuple_calchash(GstValue *tuple) {
|
||||
uint32_t i;
|
||||
uint32_t count = gst_tuple_length(tuple);
|
||||
uint32_t hash = 5387;
|
||||
for (i = 0; i < count; ++i)
|
||||
hash = (hash << 5) + hash + gst_hash(tuple[i]);
|
||||
return hash;
|
||||
}
|
||||
|
||||
/* Check if two values are equal. This is strict equality with no conversion. */
|
||||
int gst_equals(GstValue x, GstValue y) {
|
||||
int result = 0;
|
||||
if (x.type != y.type) {
|
||||
result = 0;
|
||||
} else {
|
||||
switch (x.type) {
|
||||
case GST_NIL:
|
||||
result = 1;
|
||||
break;
|
||||
case GST_BOOLEAN:
|
||||
result = (x.data.boolean == y.data.boolean);
|
||||
break;
|
||||
case GST_NUMBER:
|
||||
result = (x.data.number == y.data.number);
|
||||
break;
|
||||
/* Assume that when strings are created, equal strings
|
||||
* are set to the same string */
|
||||
case GST_STRING:
|
||||
if (x.data.string == y.data.string) {
|
||||
result = 1;
|
||||
break;
|
||||
}
|
||||
if (gst_hash(x) != gst_hash(y) ||
|
||||
gst_string_length(x.data.string) != gst_string_length(y.data.string)) {
|
||||
result = 0;
|
||||
break;
|
||||
}
|
||||
if (!strncmp((char *) x.data.string, (char *) y.data.string, gst_string_length(x.data.string))) {
|
||||
result = 1;
|
||||
break;
|
||||
}
|
||||
result = 0;
|
||||
break;
|
||||
case GST_TUPLE:
|
||||
if (x.data.tuple == y.data.tuple) {
|
||||
result = 1;
|
||||
break;
|
||||
}
|
||||
if (gst_hash(x) != gst_hash(y) ||
|
||||
gst_tuple_length(x.data.string) != gst_tuple_length(y.data.string)) {
|
||||
result = 0;
|
||||
break;
|
||||
}
|
||||
result = 1;
|
||||
{
|
||||
uint32_t i;
|
||||
for (i = 0; i < gst_tuple_length(x.data.tuple); ++i) {
|
||||
if (!gst_equals(x.data.tuple[i], y.data.tuple[i])) {
|
||||
result = 0;
|
||||
break;
|
||||
}
|
||||
}
|
||||
}
|
||||
break;
|
||||
default:
|
||||
/* compare pointers */
|
||||
result = (x.data.array == y.data.array);
|
||||
break;
|
||||
}
|
||||
}
|
||||
return result;
|
||||
}
|
||||
|
||||
/* Computes a hash value for a function */
|
||||
uint32_t gst_hash(GstValue x) {
|
||||
uint32_t hash = 0;
|
||||
switch (x.type) {
|
||||
case GST_NIL:
|
||||
hash = 0;
|
||||
break;
|
||||
case GST_BOOLEAN:
|
||||
hash = x.data.boolean;
|
||||
break;
|
||||
case GST_NUMBER:
|
||||
{
|
||||
union {
|
||||
uint32_t hash;
|
||||
GstNumber number;
|
||||
} u;
|
||||
u.number = x.data.number;
|
||||
hash = u.hash;
|
||||
}
|
||||
break;
|
||||
/* String hashes */
|
||||
case GST_STRING:
|
||||
/* Assume 0 is not hashed. */
|
||||
if (gst_string_hash(x.data.string))
|
||||
hash = gst_string_hash(x.data.string);
|
||||
else
|
||||
hash = gst_string_hash(x.data.string) = gst_string_calchash(x.data.string);
|
||||
break;
|
||||
case GST_TUPLE:
|
||||
if (gst_tuple_hash(x.data.tuple))
|
||||
hash = gst_tuple_hash(x.data.tuple);
|
||||
else
|
||||
hash = gst_tuple_hash(x.data.tuple) = tuple_calchash(x.data.tuple);
|
||||
break;
|
||||
default:
|
||||
/* Cast the pointer */
|
||||
{
|
||||
union {
|
||||
void * pointer;
|
||||
uint32_t hash;
|
||||
} u;
|
||||
u.pointer = x.data.pointer;
|
||||
hash = u.hash;
|
||||
}
|
||||
break;
|
||||
}
|
||||
return hash;
|
||||
}
|
||||
|
||||
/* Compares x to y. If they are equal retuns 0. If x is less, returns -1.
|
||||
* If y is less, returns 1. All types are comparable
|
||||
* and should have strict ordering. */
|
||||
int gst_compare(GstValue x, GstValue y) {
|
||||
if (x.type == y.type) {
|
||||
switch (x.type) {
|
||||
case GST_NIL:
|
||||
return 0;
|
||||
case GST_BOOLEAN:
|
||||
if (x.data.boolean == y.data.boolean) {
|
||||
return 0;
|
||||
} else {
|
||||
return x.data.boolean ? 1 : -1;
|
||||
}
|
||||
case GST_NUMBER:
|
||||
/* TODO: define behavior for NaN and infinties. */
|
||||
if (x.data.number == y.data.number) {
|
||||
return 0;
|
||||
} else {
|
||||
return x.data.number > y.data.number ? 1 : -1;
|
||||
}
|
||||
case GST_STRING:
|
||||
if (x.data.string == y.data.string) {
|
||||
return 0;
|
||||
} else {
|
||||
uint32_t xlen = gst_string_length(x.data.string);
|
||||
uint32_t ylen = gst_string_length(y.data.string);
|
||||
uint32_t len = xlen > ylen ? ylen : xlen;
|
||||
uint32_t i;
|
||||
for (i = 0; i < len; ++i) {
|
||||
if (x.data.string[i] == y.data.string[i]) {
|
||||
continue;
|
||||
} else if (x.data.string[i] < y.data.string[i]) {
|
||||
return 1; /* x is less then y */
|
||||
} else {
|
||||
return -1; /* y is less than x */
|
||||
}
|
||||
}
|
||||
if (xlen == ylen) {
|
||||
return 0;
|
||||
} else {
|
||||
return xlen < ylen ? -1 : 1;
|
||||
}
|
||||
}
|
||||
/* Lower indices are most significant */
|
||||
case GST_TUPLE:
|
||||
{
|
||||
uint32_t i;
|
||||
uint32_t xlen = gst_tuple_length(x.data.tuple);
|
||||
uint32_t ylen = gst_tuple_length(y.data.tuple);
|
||||
uint32_t count = xlen < ylen ? xlen : ylen;
|
||||
for (i = 0; i < count; ++i) {
|
||||
int comp = gst_compare(x.data.tuple[i], y.data.tuple[i]);
|
||||
if (comp != 0) return comp;
|
||||
}
|
||||
if (xlen < ylen)
|
||||
return -1;
|
||||
else if (xlen > ylen)
|
||||
return 1;
|
||||
return 0;
|
||||
}
|
||||
break;
|
||||
default:
|
||||
if (x.data.string == y.data.string) {
|
||||
return 0;
|
||||
} else {
|
||||
return x.data.string > y.data.string ? 1 : -1;
|
||||
}
|
||||
}
|
||||
} else if (x.type < y.type) {
|
||||
return -1;
|
||||
}
|
||||
return 1;
|
||||
}
|
||||
|
||||
/* Allow negative indexing to get from end of array like structure */
|
||||
/* This probably isn't very fast - look at Lua conversion function.
|
||||
* I would like to keep this standard C for as long as possible, though. */
|
||||
static int32_t to_index(GstNumber raw, int64_t len) {
|
||||
int32_t toInt = raw;
|
||||
if ((GstNumber) toInt == raw) {
|
||||
/* We were able to convert */
|
||||
if (toInt < 0 && len > 0) {
|
||||
/* Index from end */
|
||||
if (toInt < -len) return -1;
|
||||
return len + toInt;
|
||||
} else {
|
||||
/* Normal indexing */
|
||||
if (toInt >= len) return -1;
|
||||
return toInt;
|
||||
}
|
||||
} else {
|
||||
return -1;
|
||||
}
|
||||
}
|
||||
|
||||
/* Convert a number into a byte. */
|
||||
static uint8_t to_byte(GstNumber raw) {
|
||||
if (raw > 255) return 255;
|
||||
if (raw < 0) return 0;
|
||||
return (uint8_t) raw;
|
||||
}
|
||||
|
||||
/* Get a value out af an associated data structure.
|
||||
* Returns possible c error message, and NULL for no error. The
|
||||
* useful return value is written to out on success */
|
||||
const char *gst_get(GstValue ds, GstValue key, GstValue *out) {
|
||||
int32_t index;
|
||||
GstValue ret;
|
||||
switch (ds.type) {
|
||||
case GST_ARRAY:
|
||||
if (key.type != GST_NUMBER) return "expected numeric key";
|
||||
index = to_index(key.data.number, ds.data.array->count);
|
||||
if (index == -1) return "invalid array access";
|
||||
ret = ds.data.array->data[index];
|
||||
break;
|
||||
case GST_TUPLE:
|
||||
if (key.type != GST_NUMBER) return "expected numeric key";
|
||||
index = to_index(key.data.number, gst_tuple_length(ds.data.tuple));
|
||||
if (index < 0) return "invalid tuple access";
|
||||
ret = ds.data.tuple[index];
|
||||
break;
|
||||
case GST_BYTEBUFFER:
|
||||
if (key.type != GST_NUMBER) return "expected numeric key";
|
||||
index = to_index(key.data.number, ds.data.buffer->count);
|
||||
if (index == -1) return "invalid buffer access";
|
||||
ret.type = GST_NUMBER;
|
||||
ret.data.number = ds.data.buffer->data[index];
|
||||
break;
|
||||
case GST_STRING:
|
||||
if (key.type != GST_NUMBER) return "expected numeric key";
|
||||
index = to_index(key.data.number, gst_string_length(ds.data.string));
|
||||
if (index == -1) return "invalid string access";
|
||||
ret.type = GST_NUMBER;
|
||||
ret.data.number = ds.data.string[index];
|
||||
break;
|
||||
case GST_OBJECT:
|
||||
ret = gst_object_get(ds.data.object, key);
|
||||
break;
|
||||
default:
|
||||
return "cannot get";
|
||||
}
|
||||
*out = ret;
|
||||
return NULL;
|
||||
}
|
||||
|
||||
/* Set a value in an associative data structure. Returns possible
|
||||
* error message, and NULL if no error. */
|
||||
const char *gst_set(Gst *vm, GstValue ds, GstValue key, GstValue value) {
|
||||
int32_t index;
|
||||
switch (ds.type) {
|
||||
case GST_ARRAY:
|
||||
if (key.type != GST_NUMBER) return "expected numeric key";
|
||||
index = to_index(key.data.number, ds.data.array->count);
|
||||
if (index == -1) return "invalid array access";
|
||||
ds.data.array->data[index] = value;
|
||||
break;
|
||||
case GST_BYTEBUFFER:
|
||||
if (key.type != GST_NUMBER) return "expected numeric key";
|
||||
if (value.type != GST_NUMBER) return "expected numeric value";
|
||||
index = to_index(key.data.number, ds.data.buffer->count);
|
||||
if (index == -1) return "invalid buffer access";
|
||||
ds.data.buffer->data[index] = to_byte(value.data.number);
|
||||
break;
|
||||
case GST_OBJECT:
|
||||
if (ds.data.object->meta != NULL) {
|
||||
}
|
||||
gst_object_put(vm, ds.data.object, key, value);
|
||||
break;
|
||||
default:
|
||||
return "cannot set";
|
||||
}
|
||||
return NULL;
|
||||
}
|
||||
|
||||
/* Get the class object of a value */
|
||||
GstValue gst_get_class(GstValue x) {
|
||||
GstValue ret;
|
||||
ret.type = GST_NIL;
|
||||
switch (x.type) {
|
||||
case GST_OBJECT:
|
||||
if (x.data.object->meta != NULL) {
|
||||
ret.type = GST_OBJECT;
|
||||
ret.data.object = x.data.object->meta;
|
||||
}
|
||||
break;
|
||||
case GST_USERDATA:
|
||||
{
|
||||
GstUserdataHeader *header = (GstUserdataHeader *)x.data.pointer - 1;
|
||||
if (header->meta != NULL) {
|
||||
ret.type = GST_OBJECT;
|
||||
ret.data.object = header->meta;
|
||||
}
|
||||
}
|
||||
break;
|
||||
default:
|
||||
break;
|
||||
}
|
||||
return ret;
|
||||
}
|
||||
|
||||
/* Set the class object of a value. Returns possible c error string */
|
||||
const char *gst_set_class(GstValue x, GstValue class) {
|
||||
switch (x.type) {
|
||||
case GST_OBJECT:
|
||||
if (class.type != GST_OBJECT) return "class must be of type object";
|
||||
/* TODO - check for class immutability */
|
||||
x.data.object->meta = class.data.object;
|
||||
break;
|
||||
default:
|
||||
return "cannot set class object";
|
||||
}
|
||||
return NULL;
|
||||
}
|
||||
|
||||
Reference in New Issue
Block a user