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janet/src/core/array.c

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/*
* Copyright (c) 2018 Calvin Rose
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*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to
* deal in the Software without restriction, including without limitation the
* rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
* sell copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
* IN THE SOFTWARE.
*/
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#include <janet/janet.h>
#include "gc.h"
#include <string.h>
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/* Initializes an array */
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JanetArray *janet_array_init(JanetArray *array, int32_t capacity) {
Janet *data = NULL;
if (capacity > 0) {
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data = (Janet *) malloc(sizeof(Janet) * capacity);
if (NULL == data) {
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JANET_OUT_OF_MEMORY;
}
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}
array->count = 0;
array->capacity = capacity;
array->data = data;
return array;
}
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void janet_array_deinit(JanetArray *array) {
free(array->data);
}
/* Creates a new array */
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JanetArray *janet_array(int32_t capacity) {
JanetArray *array = janet_gcalloc(JANET_MEMORY_ARRAY, sizeof(JanetArray));
return janet_array_init(array, capacity);
}
/* Creates a new array from n elements. */
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JanetArray *janet_array_n(const Janet *elements, int32_t n) {
JanetArray *array = janet_gcalloc(JANET_MEMORY_ARRAY, sizeof(JanetArray));
array->capacity = n;
array->count = n;
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array->data = malloc(sizeof(Janet) * n);
if (!array->data) {
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JANET_OUT_OF_MEMORY;
}
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memcpy(array->data, elements, sizeof(Janet) * n);
return array;
}
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/* Ensure the array has enough capacity for elements */
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void janet_array_ensure(JanetArray *array, int32_t capacity) {
Janet *newData;
Janet *old = array->data;
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if (capacity <= array->capacity) return;
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newData = realloc(old, capacity * sizeof(Janet));
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if (NULL == newData) {
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JANET_OUT_OF_MEMORY;
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}
array->data = newData;
array->capacity = capacity;
}
/* Set the count of an array. Extend with nil if needed. */
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void janet_array_setcount(JanetArray *array, int32_t count) {
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if (count < 0)
return;
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if (count > array->count) {
int32_t i;
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janet_array_ensure(array, count);
for (i = array->count; i < count; i++) {
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array->data[i] = janet_wrap_nil();
}
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}
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array->count = count;
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}
/* Push a value to the top of the array */
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void janet_array_push(JanetArray *array, Janet x) {
int32_t newcount = array->count + 1;
if (newcount >= array->capacity) {
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janet_array_ensure(array, newcount * 2);
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}
array->data[array->count] = x;
array->count = newcount;
}
/* Pop a value from the top of the array */
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Janet janet_array_pop(JanetArray *array) {
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if (array->count) {
return array->data[--array->count];
} else {
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return janet_wrap_nil();
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}
}
/* Look at the last value in the array */
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Janet janet_array_peek(JanetArray *array) {
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if (array->count) {
return array->data[array->count - 1];
} else {
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return janet_wrap_nil();
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}
}
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/* C Functions */
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static int cfun_new(JanetArgs args) {
int32_t cap;
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JanetArray *array;
JANET_FIXARITY(args, 1);
JANET_ARG_INTEGER(cap, args, 0);
array = janet_array(cap);
JANET_RETURN_ARRAY(args, array);
}
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static int cfun_pop(JanetArgs args) {
JanetArray *array;
JANET_FIXARITY(args, 1);
JANET_ARG_ARRAY(array, args, 0);
JANET_RETURN(args, janet_array_pop(array));
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}
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static int cfun_peek(JanetArgs args) {
JanetArray *array;
JANET_FIXARITY(args, 1);
JANET_ARG_ARRAY(array, args, 0);
JANET_RETURN(args, janet_array_peek(array));
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}
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static int cfun_push(JanetArgs args) {
JanetArray *array;
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int32_t newcount;
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JANET_MINARITY(args, 1);
JANET_ARG_ARRAY(array, args, 0);
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newcount = array->count - 1 + args.n;
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janet_array_ensure(array, newcount);
if (args.n > 1) memcpy(array->data + array->count, args.v + 1, (args.n - 1) * sizeof(Janet));
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array->count = newcount;
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JANET_RETURN(args, args.v[0]);
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}
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static int cfun_setcount(JanetArgs args) {
JanetArray *array;
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int32_t newcount;
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JANET_FIXARITY(args, 2);
JANET_ARG_ARRAY(array, args, 0);
JANET_ARG_INTEGER(newcount, args, 1);
if (newcount < 0) JANET_THROW(args, "expected positive integer");
janet_array_setcount(array, newcount);
JANET_RETURN(args, args.v[0]);
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}
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static int cfun_ensure(JanetArgs args) {
JanetArray *array;
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int32_t newcount;
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JANET_FIXARITY(args, 2);
JANET_ARG_ARRAY(array, args, 0);
JANET_ARG_INTEGER(newcount, args, 1);
if (newcount < 0) JANET_THROW(args, "expected positive integer");
janet_array_ensure(array, newcount);
JANET_RETURN(args, args.v[0]);
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}
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static int cfun_slice(JanetArgs args) {
const Janet *vals;
int32_t len;
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JanetArray *ret;
int32_t start, end;
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JANET_MINARITY(args, 1);
JANET_MAXARITY(args, 3);
if (!janet_indexed_view(args.v[0], &vals, &len))
JANET_THROW(args, "expected array|tuple");
/* Get start */
if (args.n < 2) {
start = 0;
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} else if (janet_checktype(args.v[1], JANET_INTEGER)) {
start = janet_unwrap_integer(args.v[1]);
} else {
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JANET_THROW(args, "expected integer");
}
/* Get end */
if (args.n < 3) {
end = -1;
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} else if (janet_checktype(args.v[2], JANET_INTEGER)) {
end = janet_unwrap_integer(args.v[2]);
} else {
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JANET_THROW(args, "expected integer");
}
if (start < 0) start = len + start;
if (end < 0) end = len + end + 1;
if (end >= start) {
int32_t i, j;
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ret = janet_array(end - start);
for (j = 0, i = start; i < end; j++, i++) {
ret->data[j] = vals[i];
}
ret->count = j;
} else {
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ret = janet_array(0);
}
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JANET_RETURN_ARRAY(args, ret);
}
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static int cfun_concat(JanetArgs args) {
int32_t i;
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JanetArray *array;
JANET_MINARITY(args, 1);
JANET_ARG_ARRAY(array, args, 0);
for (i = 1; i < args.n; i++) {
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switch (janet_type(args.v[i])) {
default:
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janet_array_push(array, args.v[i]);
break;
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case JANET_ARRAY:
case JANET_TUPLE:
{
int32_t j, len;
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const Janet *vals;
janet_indexed_view(args.v[i], &vals, &len);
for (j = 0; j < len; j++)
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janet_array_push(array, vals[j]);
}
break;
}
}
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JANET_RETURN_ARRAY(args, array);
}
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static const JanetReg cfuns[] = {
{"array.new", cfun_new},
{"array.pop", cfun_pop},
{"array.peek", cfun_peek},
{"array.push", cfun_push},
{"array.setcount", cfun_setcount},
{"array.ensure", cfun_ensure},
{"array.slice", cfun_slice},
{"array.concat", cfun_concat},
{NULL, NULL}
};
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/* Load the array module */
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int janet_lib_array(JanetArgs args) {
JanetTable *env = janet_env(args);
janet_cfuns(env, NULL, cfuns);
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return 0;
}