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janet/core/value.c

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C
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#include <gst/gst.h>
#include <stdio.h>
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/* Boolean truth definition */
int gst_truthy(GstValue v) {
return v.type != GST_NIL && !(v.type == GST_BOOLEAN && !v.data.boolean);
}
/* Temporary buffer size */
#define GST_BUFSIZE 36
static const uint8_t *number_to_string(Gst *vm, GstNumber x) {
uint8_t buf[GST_BUFSIZE];
/* TODO - not depend on stdio */
int count = snprintf((char *) buf, GST_BUFSIZE, "%.21g", x);
return gst_string_loadbuffer(vm, buf, (uint32_t) count);
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}
static const char *HEX_CHARACTERS = "0123456789abcdef";
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#define HEX(i) (((uint8_t *) HEX_CHARACTERS)[(i)])
/* Returns a string description for a pointer. Max titlelen is GST_BUFSIZE
* - 5 - 2 * sizeof(void *). */
static const uint8_t *string_description(Gst *vm, const char *title, void *pointer) {
uint8_t buf[GST_BUFSIZE];
uint8_t *c = buf;
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uint32_t i;
union {
uint8_t bytes[sizeof(void *)];
void *p;
} pbuf;
pbuf.p = pointer;
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*c++ = '<';
for (i = 0; title[i]; ++i)
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*c++ = ((uint8_t *)title) [i];
*c++ = ' ';
*c++ = '0';
*c++ = 'x';
for (i = sizeof(void *); i > 0; --i) {
uint8_t byte = pbuf.bytes[i - 1];
if (!byte) continue;
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*c++ = HEX(byte >> 4);
*c++ = HEX(byte & 0xF);
}
*c++ = '>';
return gst_string_loadbuffer(vm, buf, c - buf);
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}
#undef GST_BUFSIZE
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/* Returns a string pointer or NULL if could not allocate memory. */
const uint8_t *gst_to_string(Gst *vm, GstValue x) {
switch (x.type) {
case GST_NIL:
return gst_cstring_to_string(vm, "nil");
case GST_BOOLEAN:
if (x.data.boolean) {
return gst_cstring_to_string(vm, "true");
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} else {
return gst_cstring_to_string(vm, "false");
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}
case GST_NUMBER:
return number_to_string(vm, x.data.number);
case GST_ARRAY:
return string_description(vm, "array", x.data.pointer);
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case GST_TUPLE:
return string_description(vm, "tuple", x.data.pointer);
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case GST_OBJECT:
return string_description(vm, "object", x.data.pointer);
case GST_STRING:
return x.data.string;
case GST_BYTEBUFFER:
return string_description(vm, "buffer", x.data.pointer);
case GST_CFUNCTION:
return string_description(vm, "cfunction", x.data.pointer);
case GST_FUNCTION:
return string_description(vm, "function", x.data.pointer);
case GST_THREAD:
return string_description(vm, "thread", x.data.pointer);
case GST_USERDATA:
return string_description(vm, "userdata", x.data.pointer);
case GST_FUNCENV:
return string_description(vm, "funcenv", x.data.pointer);
case GST_FUNCDEF:
return string_description(vm, "funcdef", x.data.pointer);
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}
return NULL;
}
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/* Simple hash function to get tuple hash */
static uint32_t tuple_calchash(GstValue *tuple) {
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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;
}
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/* 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) {
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result = 0;
} else {
switch (x.type) {
case GST_NIL:
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result = 1;
break;
case GST_BOOLEAN:
result = (x.data.boolean == y.data.boolean);
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break;
case GST_NUMBER:
result = (x.data.number == y.data.number);
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break;
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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;
{
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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;
}
}
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}
break;
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default:
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/* compare pointers */
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result = (x.data.pointer == y.data.pointer);
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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:
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hash = 0;
break;
case GST_BOOLEAN:
hash = x.data.boolean;
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break;
case GST_NUMBER:
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{
union {
uint32_t hash;
GstNumber number;
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} u;
u.number = x.data.number;
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hash = u.hash;
}
break;
/* String hashes */
case GST_STRING:
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hash = gst_string_hash(x.data.string);
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break;
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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);
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break;
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default:
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/* Cast the pointer */
{
union {
void * pointer;
uint32_t hash;
} u;
u.pointer = x.data.pointer;
hash = u.hash;
}
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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:
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return 0;
case GST_BOOLEAN:
if (x.data.boolean == y.data.boolean) {
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return 0;
} else {
return x.data.boolean ? 1 : -1;
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}
case GST_NUMBER:
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/* TODO: define behavior for NaN and infinties. */
if (x.data.number == y.data.number) {
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return 0;
} else {
return x.data.number > y.data.number ? 1 : -1;
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}
case GST_STRING:
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return gst_string_compare(x.data.string, y.data.string);
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/* Lower indices are most significant */
case GST_TUPLE:
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{
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;
}
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break;
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default:
if (x.data.string == y.data.string) {
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return 0;
} else {
return x.data.string > y.data.string ? 1 : -1;
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}
}
} else if (x.type < y.type) {
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return -1;
}
return 1;
}
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/* 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) {
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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;
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}
}
/* Convert a number into a byte. */
static uint8_t to_byte(GstNumber raw) {
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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;
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switch (ds.type) {
case GST_ARRAY:
if (key.type != GST_NUMBER) return "expected numeric key";
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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";
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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);
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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));
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if (index == -1) return "invalid string access";
ret.type = GST_NUMBER;
ret.data.number = ds.data.string[index];
break;
case GST_OBJECT:
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ret = gst_object_get(ds.data.object, key);
break;
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default:
return "cannot get";
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}
*out = ret;
return NULL;
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}
/* 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;
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switch (ds.type) {
case GST_ARRAY:
if (key.type != GST_NUMBER) return "expected numeric key";
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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);
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if (index == -1) return "invalid buffer access";
ds.data.buffer->data[index] = to_byte(value.data.number);
break;
case GST_OBJECT:
gst_object_put(vm, ds.data.object, key, value);
break;
default:
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return "cannot set";
}
return NULL;
}
/* Get the length of an object. Returns errors for invalid types */
int gst_length(Gst *vm, GstValue x, GstValue *len) {
uint32_t length;
switch (x.type) {
default:
vm->ret = gst_load_cstring(vm, "cannot get length");
return GST_RETURN_ERROR;
case GST_STRING:
length = gst_string_length(x.data.string);
break;
case GST_ARRAY:
length = x.data.array->count;
break;
case GST_BYTEBUFFER:
length = x.data.buffer->count;
break;
case GST_TUPLE:
length = gst_tuple_length(x.data.tuple);
break;
case GST_OBJECT:
length = x.data.object->count;
break;
}
/* Normal numeric return */
len->type = GST_NUMBER;
len->data.number = (GstNumber) length;
return GST_RETURN_OK;
}