mirror of
https://github.com/janet-lang/janet
synced 2024-11-16 05:34:48 +00:00
254 lines
8.4 KiB
C
254 lines
8.4 KiB
C
/*
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* Copyright (c) 2017 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 <gst/gst.h>
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#include <stdio.h>
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/* Boolean truth definition */
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int gst_truthy(GstValue v) {
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return v.type != GST_NIL && !(v.type == GST_BOOLEAN && !v.data.boolean);
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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 gst_equals(GstValue x, GstValue y) {
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int result = 0;
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if (x.type != y.type) {
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result = 0;
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} else {
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switch (x.type) {
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case GST_NIL:
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result = 1;
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break;
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case GST_BOOLEAN:
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result = (x.data.boolean == y.data.boolean);
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break;
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case GST_REAL:
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result = (x.data.real == y.data.real);
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break;
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case GST_INTEGER:
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result = (x.data.integer == y.data.integer);
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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;
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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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uint32_t gst_hash(GstValue x) {
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uint32_t hash = 0;
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switch (x.type) {
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case GST_NIL:
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hash = 0;
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break;
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case GST_BOOLEAN:
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hash = x.data.boolean;
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break;
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case GST_STRING:
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case GST_SYMBOL:
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hash = gst_string_hash(x.data.string);
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break;
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case GST_TUPLE:
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hash = gst_tuple_hash(x.data.tuple);
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break;
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case GST_STRUCT:
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hash = gst_struct_hash(x.data.st);
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break;
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default:
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if (sizeof(double) == sizeof(void *)) {
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/* Assuming 8 byte pointer */
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hash = x.data.dwords[0] ^ x.data.dwords[1];
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} else {
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/* Assuming 4 byte pointer (or smaller) */
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hash = (uint32_t) x.data.pointer;
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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 retuns 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 gst_compare(GstValue x, GstValue y) {
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if (x.type == y.type) {
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switch (x.type) {
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case GST_NIL:
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return 0;
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case GST_BOOLEAN:
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if (x.data.boolean == y.data.boolean) {
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return 0;
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} else {
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return x.data.boolean ? 1 : -1;
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}
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case GST_REAL:
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if (x.data.real == y.data.real) {
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return 0;
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} else {
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return x.data.real > y.data.real ? 1 : -1;
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}
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case GST_INTEGER:
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if (x.data.integer == y.data.integer) {
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return 0;
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} else {
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return x.data.integer > y.data.integer ? 1 : -1;
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}
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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 */
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case GST_TUPLE:
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{
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uint32_t i;
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uint32_t xlen = gst_tuple_length(x.data.tuple);
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uint32_t ylen = gst_tuple_length(y.data.tuple);
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uint32_t count = xlen < ylen ? xlen : ylen;
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for (i = 0; i < count; ++i) {
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int comp = gst_compare(x.data.tuple[i], y.data.tuple[i]);
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if (comp != 0) return comp;
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}
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if (xlen < ylen)
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return -1;
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else if (xlen > ylen)
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return 1;
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return 0;
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}
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break;
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default:
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if (x.data.string == y.data.string) {
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return 0;
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} else {
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return x.data.string > y.data.string ? 1 : -1;
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}
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}
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} else if (x.type < y.type) {
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return -1;
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}
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return 1;
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}
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/* Get a value out af an associated data structure.
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* Returns possible c error message, and NULL for no error. The
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* useful return value is written to out on success */
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const char *gst_get(GstValue ds, GstValue key, GstValue *out) {
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GstInteger index;
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GstValue ret;
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switch (ds.type) {
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case GST_ARRAY:
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if (key.type != GST_INTEGER) return "expected integer key";
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index = gst_startrange(key.data.integer, ds.data.array->count);
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if (index < 0) return "invalid array access";
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ret = ds.data.array->data[index];
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break;
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case GST_TUPLE:
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if (key.type != GST_INTEGER) return "expected integer key";
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index = gst_startrange(key.data.integer, gst_tuple_length(ds.data.tuple));
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if (index < 0) return "invalid tuple access";
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ret = ds.data.tuple[index];
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break;
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case GST_BYTEBUFFER:
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if (key.type != GST_INTEGER) return "expected integer key";
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index = gst_startrange(key.data.integer, ds.data.buffer->count);
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if (index < 0) return "invalid buffer access";
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ret.type = GST_INTEGER;
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ret.data.integer = ds.data.buffer->data[index];
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break;
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case GST_STRING:
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case GST_SYMBOL:
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if (key.type != GST_INTEGER) return "expected integer key";
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index = gst_startrange(key.data.integer, gst_string_length(ds.data.string));
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if (index < 0) return "invalid string access";
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ret.type = GST_INTEGER;
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ret.data.integer = ds.data.string[index];
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break;
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case GST_STRUCT:
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ret = gst_struct_get(ds.data.st, key);
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break;
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case GST_TABLE:
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ret = gst_table_get(ds.data.table, key);
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break;
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default:
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return "cannot get";
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}
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*out = ret;
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return NULL;
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}
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/* Set a value in an associative data structure. Returns possible
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* error message, and NULL if no error. */
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const char *gst_set(Gst *vm, GstValue ds, GstValue key, GstValue value) {
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GstInteger index;
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switch (ds.type) {
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case GST_ARRAY:
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if (key.type != GST_INTEGER) return "expected integer key";
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index = gst_startrange(key.data.integer, ds.data.array->count);
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if (index < 0) return "invalid array access";
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ds.data.array->data[index] = value;
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break;
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case GST_BYTEBUFFER:
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if (key.type != GST_INTEGER) return "expected integer key";
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if (value.type != GST_INTEGER) return "expected integer value";
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index = gst_startrange(key.data.integer, ds.data.buffer->count);
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if (index < 0) return "invalid buffer access";
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ds.data.buffer->data[index] = (uint8_t) value.data.integer;
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break;
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case GST_TABLE:
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gst_table_put(vm, ds.data.table, key, value);
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break;
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default:
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return "cannot set";
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}
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return NULL;
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}
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/* Get the length of an object. Returns errors for invalid types */
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GstInteger gst_length(Gst *vm, GstValue x) {
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GstInteger length;
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switch (x.type) {
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default:
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vm->ret = gst_string_cv(vm, "cannot get length");
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return GST_RETURN_ERROR;
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case GST_STRING:
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length = gst_string_length(x.data.string);
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break;
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case GST_ARRAY:
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length = x.data.array->count;
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break;
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case GST_BYTEBUFFER:
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length = x.data.buffer->count;
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break;
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case GST_TUPLE:
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length = gst_tuple_length(x.data.tuple);
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break;
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case GST_STRUCT:
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length = gst_struct_length(x.data.st);
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break;
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case GST_TABLE:
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length = x.data.table->count;
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break;
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}
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return length;
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}
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