mirror of https://github.com/janet-lang/janet
302 lines
9.1 KiB
C
302 lines
9.1 KiB
C
/*
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* Copyright (c) 2018 Calvin Rose
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to
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* deal in the Software without restriction, including without limitation the
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* rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
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* sell copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
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* IN THE SOFTWARE.
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*/
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#include <janet/janet.h>
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#include "gc.h"
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#include "util.h"
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#define janet_table_maphash(cap, hash) ((uint32_t)(hash) & (cap - 1))
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/* Initialize a table */
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JanetTable *janet_table_init(JanetTable *table, int32_t capacity) {
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JanetKV *data;
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capacity = janet_tablen(capacity);
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if (capacity) {
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data = (JanetKV *) janet_memalloc_empty(capacity);
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if (NULL == data) {
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JANET_OUT_OF_MEMORY;
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}
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table->data = data;
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table->capacity = capacity;
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} else {
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table->data = NULL;
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table->capacity = 0;
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}
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table->count = 0;
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table->deleted = 0;
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table->proto = NULL;
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return table;
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}
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/* Deinitialize a table */
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void janet_table_deinit(JanetTable *table) {
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free(table->data);
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}
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/* Create a new table */
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JanetTable *janet_table(int32_t capacity) {
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JanetTable *table = janet_gcalloc(JANET_MEMORY_TABLE, sizeof(JanetTable));
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return janet_table_init(table, capacity);
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}
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/* Find the bucket that contains the given key. Will also return
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* bucket where key should go if not in the table. */
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JanetKV *janet_table_find(JanetTable *t, Janet key) {
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int32_t index = janet_table_maphash(t->capacity, janet_hash(key));
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int32_t i;
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JanetKV *first_bucket = NULL;
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/* Higher half */
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for (i = index; i < t->capacity; i++) {
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JanetKV *kv = t->data + i;
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if (janet_checktype(kv->key, JANET_NIL)) {
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if (janet_checktype(kv->value, JANET_NIL)) {
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return kv;
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} else if (NULL == first_bucket) {
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first_bucket = kv;
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}
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} else if (janet_equals(kv->key, key)) {
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return t->data + i;
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}
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}
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/* Lower half */
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for (i = 0; i < index; i++) {
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JanetKV *kv = t->data + i;
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if (janet_checktype(kv->key, JANET_NIL)) {
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if (janet_checktype(kv->value, JANET_NIL)) {
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return kv;
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} else if (NULL == first_bucket) {
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first_bucket = kv;
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}
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} else if (janet_equals(kv->key, key)) {
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return t->data + i;
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}
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}
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return first_bucket;
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}
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/* Resize the dictionary table. */
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static void janet_table_rehash(JanetTable *t, int32_t size) {
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JanetKV *olddata = t->data;
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JanetKV *newdata = (JanetKV *) janet_memalloc_empty(size);
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if (NULL == newdata) {
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JANET_OUT_OF_MEMORY;
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}
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int32_t i, oldcapacity;
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oldcapacity = t->capacity;
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t->data = newdata;
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t->capacity = size;
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t->deleted = 0;
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for (i = 0; i < oldcapacity; i++) {
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JanetKV *kv = olddata + i;
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if (!janet_checktype(kv->key, JANET_NIL)) {
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JanetKV *newkv = janet_table_find(t, kv->key);
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*newkv = *kv;
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}
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}
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free(olddata);
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}
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/* Get a value out of the table */
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Janet janet_table_get(JanetTable *t, Janet key) {
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JanetKV *bucket = janet_table_find(t, key);
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if (NULL != bucket && !janet_checktype(bucket->key, JANET_NIL))
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return bucket->value;
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/* Check prototypes */
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{
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int i;
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for (i = JANET_MAX_PROTO_DEPTH, t = t->proto; t && i; t = t->proto, --i) {
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bucket = janet_table_find(t, key);
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if (NULL != bucket && !janet_checktype(bucket->key, JANET_NIL))
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return bucket->value;
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}
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}
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return janet_wrap_nil();
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}
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/* Get a value out of the table. Don't check prototype tables. */
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Janet janet_table_rawget(JanetTable *t, Janet key) {
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JanetKV *bucket = janet_table_find(t, key);
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if (NULL != bucket && !janet_checktype(bucket->key, JANET_NIL))
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return bucket->value;
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else
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return janet_wrap_nil();
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}
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/* Remove an entry from the dictionary. Return the value that
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* was removed. */
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Janet janet_table_remove(JanetTable *t, Janet key) {
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JanetKV *bucket = janet_table_find(t, key);
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if (NULL != bucket && !janet_checktype(bucket->key, JANET_NIL)) {
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Janet ret = bucket->key;
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t->count--;
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t->deleted++;
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bucket->key = janet_wrap_nil();
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bucket->value = janet_wrap_false();
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return ret;
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} else {
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return janet_wrap_nil();
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}
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}
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/* Put a value into the object */
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void janet_table_put(JanetTable *t, Janet key, Janet value) {
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if (janet_checktype(key, JANET_NIL)) return;
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if (janet_checktype(value, JANET_NIL)) {
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janet_table_remove(t, key);
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} else {
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JanetKV *bucket = janet_table_find(t, key);
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if (NULL != bucket && !janet_checktype(bucket->key, JANET_NIL)) {
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bucket->value = value;
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} else {
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if (NULL == bucket || 2 * (t->count + t->deleted + 1) > t->capacity) {
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janet_table_rehash(t, janet_tablen(2 * t->count + 2));
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}
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bucket = janet_table_find(t, key);
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if (janet_checktype(bucket->value, JANET_FALSE))
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--t->deleted;
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bucket->key = key;
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bucket->value = value;
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++t->count;
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}
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}
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}
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/* Clear a table */
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void janet_table_clear(JanetTable *t) {
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int32_t capacity = t->capacity;
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JanetKV *data = t->data;
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janet_memempty(data, capacity);
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t->count = 0;
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t->deleted = 0;
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}
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/* Find next key in an object. Returns NULL if no next key. */
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const JanetKV *janet_table_next(JanetTable *t, const JanetKV *kv) {
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JanetKV *end = t->data + t->capacity;
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kv = (kv == NULL) ? t->data : kv + 1;
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while (kv < end) {
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if (!janet_checktype(kv->key, JANET_NIL))
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return kv;
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kv++;
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}
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return NULL;
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}
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/* Convert table to struct */
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const JanetKV *janet_table_to_struct(JanetTable *t) {
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JanetKV *st = janet_struct_begin(t->count);
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JanetKV *kv = t->data;
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JanetKV *end = t->data + t->capacity;
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while (kv < end) {
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if (!janet_checktype(kv->key, JANET_NIL))
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janet_struct_put(st, kv->key, kv->value);
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kv++;
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}
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return janet_struct_end(st);
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}
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/* Merge a table or struct into a table */
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static void janet_table_mergekv(JanetTable *table, const JanetKV *kvs, int32_t cap) {
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int32_t i;
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for (i = 0; i < cap; i++) {
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const JanetKV *kv = kvs + i;
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if (!janet_checktype(kv->key, JANET_NIL)) {
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janet_table_put(table, kv->key, kv->value);
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}
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}
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}
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/* Merge a table other into another table */
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void janet_table_merge_table(JanetTable *table, JanetTable *other) {
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janet_table_mergekv(table, other->data, other->capacity);
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}
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/* Merge a struct into a table */
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void janet_table_merge_struct(JanetTable *table, const JanetKV *other) {
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janet_table_mergekv(table, other, janet_struct_capacity(other));
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}
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/* C Functions */
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static int cfun_new(JanetArgs args) {
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JanetTable *t;
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int32_t cap;
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JANET_FIXARITY(args, 1);
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JANET_ARG_INTEGER(cap, args, 0);
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t = janet_table(cap);
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JANET_RETURN_TABLE(args, t);
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}
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static int cfun_getproto(JanetArgs args) {
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JanetTable *t;
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JANET_FIXARITY(args, 1);
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JANET_ARG_TABLE(t, args, 0);
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JANET_RETURN(args, t->proto
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? janet_wrap_table(t->proto)
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: janet_wrap_nil());
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}
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static int cfun_setproto(JanetArgs args) {
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JanetTable *table, *proto;
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JANET_FIXARITY(args, 2);
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JANET_ARG_TABLE(table, args, 0);
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if (janet_checktype(args.v[1], JANET_NIL)) {
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proto = NULL;
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} else {
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JANET_ARG_TABLE(proto, args, 1);
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}
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table->proto = proto;
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JANET_RETURN_TABLE(args, table);
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}
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static int cfun_tostruct(JanetArgs args) {
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JanetTable *t;
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JANET_FIXARITY(args, 1);
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JANET_ARG_TABLE(t, args, 0);
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JANET_RETURN_STRUCT(args, janet_table_to_struct(t));
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}
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static int cfun_rawget(JanetArgs args) {
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JanetTable *table;
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JANET_FIXARITY(args, 2);
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JANET_ARG_TABLE(table, args, 0);
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JANET_RETURN(args, janet_table_rawget(table, args.v[1]));
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}
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static const JanetReg cfuns[] = {
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{"table.new", cfun_new},
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{"table.to-struct", cfun_tostruct},
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{"table.getproto", cfun_getproto},
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{"table.setproto", cfun_setproto},
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{"table.rawget", cfun_rawget},
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{NULL, NULL}
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};
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/* Load the table module */
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int janet_lib_table(JanetArgs args) {
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JanetTable *env = janet_env(args);
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janet_cfuns(env, NULL, cfuns);
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return 0;
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}
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#undef janet_table_maphash
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