mirror of
https://github.com/janet-lang/janet
synced 2024-11-26 02:07:19 +00:00
aee1687215
The new RNG wraps up state for random number generation, so one can have many rngs and even marshal and unmarshal them. Adds math/rng, math/rng-uniform, and math/rng-int. Also introduce `in` and change semantics for indexing out of range. This commit enforces stricter invariants on keys when indexing via a function call on the data structure, or the new `in` function. The `get` function is now more lax about keys, and will not throw an error when a bad key is used for a data structure, instead returning the default value.
400 lines
14 KiB
C
400 lines
14 KiB
C
/*
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* Copyright (c) 2019 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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#ifndef JANET_AMALG
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#include <janet.h>
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#endif
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/*
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* Define a number of functions that can be used internally on ANY Janet.
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*/
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/* Check if two values are equal. This is strict equality with no conversion. */
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int janet_equals(Janet x, Janet y) {
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int result = 0;
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if (janet_type(x) != janet_type(y)) {
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result = 0;
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} else {
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switch (janet_type(x)) {
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case JANET_NIL:
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result = 1;
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break;
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case JANET_BOOLEAN:
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result = (janet_unwrap_boolean(x) == janet_unwrap_boolean(y));
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break;
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case JANET_NUMBER:
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result = (janet_unwrap_number(x) == janet_unwrap_number(y));
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break;
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case JANET_STRING:
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result = janet_string_equal(janet_unwrap_string(x), janet_unwrap_string(y));
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break;
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case JANET_TUPLE:
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result = janet_tuple_equal(janet_unwrap_tuple(x), janet_unwrap_tuple(y));
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break;
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case JANET_STRUCT:
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result = janet_struct_equal(janet_unwrap_struct(x), janet_unwrap_struct(y));
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break;
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default:
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/* compare pointers */
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result = (janet_unwrap_pointer(x) == janet_unwrap_pointer(y));
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break;
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}
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}
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return result;
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}
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/* Computes a hash value for a function */
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int32_t janet_hash(Janet x) {
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int32_t hash = 0;
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switch (janet_type(x)) {
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case JANET_NIL:
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hash = 0;
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break;
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case JANET_BOOLEAN:
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hash = janet_unwrap_boolean(x);
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break;
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case JANET_STRING:
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case JANET_SYMBOL:
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case JANET_KEYWORD:
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hash = janet_string_hash(janet_unwrap_string(x));
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break;
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case JANET_TUPLE:
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hash = janet_tuple_hash(janet_unwrap_tuple(x));
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break;
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case JANET_STRUCT:
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hash = janet_struct_hash(janet_unwrap_struct(x));
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break;
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default:
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/* TODO - test performance with different hash functions */
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if (sizeof(double) == sizeof(void *)) {
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/* Assuming 8 byte pointer */
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uint64_t i = janet_u64(x);
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hash = (int32_t)(i & 0xFFFFFFFF);
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/* Get a bit more entropy by shifting the low bits out */
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hash >>= 3;
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hash ^= (int32_t)(i >> 32);
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} else {
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/* Assuming 4 byte pointer (or smaller) */
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hash = (int32_t)((char *)janet_unwrap_pointer(x) - (char *)0);
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hash >>= 2;
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}
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break;
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}
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return hash;
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}
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/* Compares x to y. If they are equal returns 0. If x is less, returns -1.
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* If y is less, returns 1. All types are comparable
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* and should have strict ordering. */
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int janet_compare(Janet x, Janet y) {
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if (janet_type(x) == janet_type(y)) {
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switch (janet_type(x)) {
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case JANET_NIL:
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return 0;
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case JANET_BOOLEAN:
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return janet_unwrap_boolean(x) - janet_unwrap_boolean(y);
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case JANET_NUMBER:
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/* Check for NaNs to ensure total order */
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if (janet_unwrap_number(x) != janet_unwrap_number(x))
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return janet_unwrap_number(y) != janet_unwrap_number(y)
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? 0
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: -1;
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if (janet_unwrap_number(y) != janet_unwrap_number(y))
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return 1;
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if (janet_unwrap_number(x) == janet_unwrap_number(y)) {
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return 0;
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} else {
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return janet_unwrap_number(x) > janet_unwrap_number(y) ? 1 : -1;
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}
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case JANET_STRING:
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case JANET_SYMBOL:
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case JANET_KEYWORD:
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return janet_string_compare(janet_unwrap_string(x), janet_unwrap_string(y));
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case JANET_TUPLE:
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return janet_tuple_compare(janet_unwrap_tuple(x), janet_unwrap_tuple(y));
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case JANET_STRUCT:
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return janet_struct_compare(janet_unwrap_struct(x), janet_unwrap_struct(y));
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default:
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if (janet_unwrap_string(x) == janet_unwrap_string(y)) {
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return 0;
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} else {
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return janet_unwrap_string(x) > janet_unwrap_string(y) ? 1 : -1;
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}
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}
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}
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return (janet_type(x) < janet_type(y)) ? -1 : 1;
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}
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static int32_t getter_checkint(Janet key, int32_t max) {
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if (!janet_checkint(key)) goto bad;
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int32_t ret = janet_unwrap_integer(key);
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if (ret < 0) goto bad;
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if (ret >= max) goto bad;
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return ret;
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bad:
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janet_panicf("expected integer key in range [0, %d), got %v", max, key);
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}
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/* Gets a value and returns. Can panic. */
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Janet janet_get(Janet ds, Janet key) {
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Janet value;
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switch (janet_type(ds)) {
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default:
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janet_panicf("expected %T, got %v", JANET_TFLAG_LENGTHABLE, ds);
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break;
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case JANET_STRUCT:
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value = janet_struct_get(janet_unwrap_struct(ds), key);
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break;
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case JANET_TABLE:
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value = janet_table_get(janet_unwrap_table(ds), key);
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break;
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case JANET_ARRAY: {
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JanetArray *array = janet_unwrap_array(ds);
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int32_t index = getter_checkint(key, array->count);
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value = array->data[index];
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break;
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}
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case JANET_TUPLE: {
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const Janet *tuple = janet_unwrap_tuple(ds);
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int32_t len = janet_tuple_length(tuple);
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value = tuple[getter_checkint(key, len)];
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break;
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}
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case JANET_BUFFER: {
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JanetBuffer *buffer = janet_unwrap_buffer(ds);
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int32_t index = getter_checkint(key, buffer->count);
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value = janet_wrap_integer(buffer->data[index]);
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break;
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}
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case JANET_STRING:
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case JANET_SYMBOL:
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case JANET_KEYWORD: {
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const uint8_t *str = janet_unwrap_string(ds);
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int32_t index = getter_checkint(key, janet_string_length(str));
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value = janet_wrap_integer(str[index]);
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break;
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}
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case JANET_ABSTRACT: {
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JanetAbstractType *type = (JanetAbstractType *)janet_abstract_type(janet_unwrap_abstract(ds));
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if (type->get) {
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value = (type->get)(janet_unwrap_abstract(ds), key);
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} else {
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janet_panicf("no getter for %v ", ds);
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}
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break;
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}
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}
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return value;
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}
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Janet janet_getindex(Janet ds, int32_t index) {
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Janet value;
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if (index < 0) janet_panic("expected non-negative index");
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switch (janet_type(ds)) {
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default:
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janet_panicf("expected %T, got %v", JANET_TFLAG_LENGTHABLE, ds);
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break;
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case JANET_STRING:
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case JANET_SYMBOL:
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case JANET_KEYWORD:
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if (index >= janet_string_length(janet_unwrap_string(ds))) {
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value = janet_wrap_nil();
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} else {
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value = janet_wrap_integer(janet_unwrap_string(ds)[index]);
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}
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break;
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case JANET_ARRAY:
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if (index >= janet_unwrap_array(ds)->count) {
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value = janet_wrap_nil();
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} else {
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value = janet_unwrap_array(ds)->data[index];
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}
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break;
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case JANET_BUFFER:
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if (index >= janet_unwrap_buffer(ds)->count) {
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value = janet_wrap_nil();
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} else {
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value = janet_wrap_integer(janet_unwrap_buffer(ds)->data[index]);
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}
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break;
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case JANET_TUPLE:
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if (index >= janet_tuple_length(janet_unwrap_tuple(ds))) {
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value = janet_wrap_nil();
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} else {
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value = janet_unwrap_tuple(ds)[index];
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}
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break;
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case JANET_TABLE:
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value = janet_table_get(janet_unwrap_table(ds), janet_wrap_integer(index));
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break;
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case JANET_STRUCT:
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value = janet_struct_get(janet_unwrap_struct(ds), janet_wrap_integer(index));
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break;
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case JANET_ABSTRACT: {
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JanetAbstractType *type = (JanetAbstractType *)janet_abstract_type(janet_unwrap_abstract(ds));
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if (type->get) {
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value = (type->get)(janet_unwrap_abstract(ds), janet_wrap_integer(index));
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} else {
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janet_panicf("no getter for %v ", ds);
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}
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break;
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}
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}
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return value;
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}
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int32_t janet_length(Janet x) {
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switch (janet_type(x)) {
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default:
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janet_panicf("expected %T, got %v", JANET_TFLAG_LENGTHABLE, x);
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case JANET_STRING:
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case JANET_SYMBOL:
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case JANET_KEYWORD:
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return janet_string_length(janet_unwrap_string(x));
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case JANET_ARRAY:
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return janet_unwrap_array(x)->count;
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case JANET_BUFFER:
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return janet_unwrap_buffer(x)->count;
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case JANET_TUPLE:
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return janet_tuple_length(janet_unwrap_tuple(x));
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case JANET_STRUCT:
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return janet_struct_length(janet_unwrap_struct(x));
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case JANET_TABLE:
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return janet_unwrap_table(x)->count;
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case JANET_ABSTRACT: {
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Janet argv[1] = { x };
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Janet len = janet_mcall("length", 1, argv);
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if (!janet_checkint(len))
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janet_panicf("invalid integer length %v", len);
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return janet_unwrap_integer(len);
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}
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}
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}
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Janet janet_lengthv(Janet x) {
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switch (janet_type(x)) {
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default:
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janet_panicf("expected %T, got %v", JANET_TFLAG_LENGTHABLE, x);
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case JANET_STRING:
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case JANET_SYMBOL:
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case JANET_KEYWORD:
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return janet_wrap_integer(janet_string_length(janet_unwrap_string(x)));
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case JANET_ARRAY:
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return janet_wrap_integer(janet_unwrap_array(x)->count);
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case JANET_BUFFER:
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return janet_wrap_integer(janet_unwrap_buffer(x)->count);
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case JANET_TUPLE:
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return janet_wrap_integer(janet_tuple_length(janet_unwrap_tuple(x)));
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case JANET_STRUCT:
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return janet_wrap_integer(janet_struct_length(janet_unwrap_struct(x)));
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case JANET_TABLE:
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return janet_wrap_integer(janet_unwrap_table(x)->count);
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case JANET_ABSTRACT: {
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Janet argv[1] = { x };
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return janet_mcall("length", 1, argv);
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}
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}
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}
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void janet_putindex(Janet ds, int32_t index, Janet value) {
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switch (janet_type(ds)) {
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default:
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janet_panicf("expected %T, got %v",
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JANET_TFLAG_ARRAY | JANET_TFLAG_BUFFER | JANET_TFLAG_TABLE, ds);
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case JANET_ARRAY: {
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JanetArray *array = janet_unwrap_array(ds);
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if (index >= array->count) {
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janet_array_ensure(array, index + 1, 2);
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array->count = index + 1;
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}
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array->data[index] = value;
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break;
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}
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case JANET_BUFFER: {
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JanetBuffer *buffer = janet_unwrap_buffer(ds);
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if (!janet_checkint(value))
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janet_panicf("can only put integers in buffers, got %v", value);
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if (index >= buffer->count) {
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janet_buffer_ensure(buffer, index + 1, 2);
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buffer->count = index + 1;
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}
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buffer->data[index] = (uint8_t)(janet_unwrap_integer(value) & 0xFF);
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break;
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}
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case JANET_TABLE: {
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JanetTable *table = janet_unwrap_table(ds);
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janet_table_put(table, janet_wrap_integer(index), value);
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break;
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}
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case JANET_ABSTRACT: {
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JanetAbstractType *type = (JanetAbstractType *)janet_abstract_type(janet_unwrap_abstract(ds));
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if (type->put) {
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(type->put)(janet_unwrap_abstract(ds), janet_wrap_integer(index), value);
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} else {
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janet_panicf("no setter for %v ", ds);
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}
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break;
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}
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}
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}
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void janet_put(Janet ds, Janet key, Janet value) {
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switch (janet_type(ds)) {
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default:
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janet_panicf("expected %T, got %v",
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JANET_TFLAG_ARRAY | JANET_TFLAG_BUFFER | JANET_TFLAG_TABLE, ds);
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case JANET_ARRAY: {
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JanetArray *array = janet_unwrap_array(ds);
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int32_t index = getter_checkint(key, INT32_MAX - 1);
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if (index >= array->count) {
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janet_array_setcount(array, index + 1);
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}
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array->data[index] = value;
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break;
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}
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case JANET_BUFFER: {
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JanetBuffer *buffer = janet_unwrap_buffer(ds);
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int32_t index = getter_checkint(key, INT32_MAX - 1);
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if (!janet_checkint(value))
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janet_panicf("can only put integers in buffers, got %v", value);
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if (index >= buffer->count) {
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janet_buffer_setcount(buffer, index + 1);
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}
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buffer->data[index] = (uint8_t)(janet_unwrap_integer(value) & 0xFF);
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break;
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}
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case JANET_TABLE:
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janet_table_put(janet_unwrap_table(ds), key, value);
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break;
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case JANET_ABSTRACT: {
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JanetAbstractType *type = (JanetAbstractType *)janet_abstract_type(janet_unwrap_abstract(ds));
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if (type->put) {
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(type->put)(janet_unwrap_abstract(ds), key, value);
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} else {
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janet_panicf("no setter for %v ", ds);
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}
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break;
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}
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}
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}
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