mirror of
https://github.com/janet-lang/janet
synced 2024-12-25 16:00:27 +00:00
389 lines
12 KiB
C
389 lines
12 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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/* Temporary buffer size */
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#define GST_BUFSIZE 36
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static const uint8_t *real_to_string(Gst *vm, GstReal x) {
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uint8_t buf[GST_BUFSIZE];
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int count = snprintf((char *) buf, GST_BUFSIZE, "%.21gF", x);
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return gst_string_b(vm, buf, (uint32_t) count);
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}
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static const uint8_t *integer_to_string(Gst *vm, GstInteger x) {
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uint8_t buf[GST_BUFSIZE];
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int neg = 0;
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uint8_t *hi, *low;
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uint32_t count = 0;
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if (x == 0) return gst_string_c(vm, "0");
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if (x < 0) {
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neg = 1;
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x = -x;
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}
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while (x > 0) {
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uint8_t digit = x % 10;
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buf[count++] = '0' + digit;
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x /= 10;
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}
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if (neg)
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buf[count++] = '-';
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/* Reverse */
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hi = buf + count - 1;
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low = buf;
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while (hi > low) {
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uint8_t temp = *low;
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*low++ = *hi;
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*hi-- = temp;
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}
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return gst_string_b(vm, buf, (uint32_t) count);
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}
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static const char *HEX_CHARACTERS = "0123456789abcdef";
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#define HEX(i) (((uint8_t *) HEX_CHARACTERS)[(i)])
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/* Returns a string description for a pointer. Max titlelen is GST_BUFSIZE
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* - 5 - 2 * sizeof(void *). */
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static const uint8_t *string_description(Gst *vm, const char *title, void *pointer) {
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uint8_t buf[GST_BUFSIZE];
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uint8_t *c = buf;
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uint32_t i;
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union {
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uint8_t bytes[sizeof(void *)];
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void *p;
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} pbuf;
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pbuf.p = pointer;
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*c++ = '<';
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for (i = 0; title[i]; ++i)
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*c++ = ((uint8_t *)title) [i];
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*c++ = ' ';
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*c++ = '0';
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*c++ = 'x';
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for (i = sizeof(void *); i > 0; --i) {
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uint8_t byte = pbuf.bytes[i - 1];
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if (!byte) continue;
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*c++ = HEX(byte >> 4);
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*c++ = HEX(byte & 0xF);
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}
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*c++ = '>';
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return gst_string_b(vm, buf, c - buf);
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}
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/* Gets the string value of userdata. Allocates memory, so is slower than
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* string_description. */
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static const uint8_t *string_udata(Gst *vm, const char *title, void *pointer) {
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uint32_t strlen = 0;
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uint8_t *c, *buf;
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uint32_t i;
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union {
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uint8_t bytes[sizeof(void *)];
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void *p;
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} pbuf;
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while (title[strlen]) ++strlen;
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c = buf = gst_alloc(vm, strlen + 5 + 2 * sizeof(void *));
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pbuf.p = pointer;
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*c++ = '<';
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for (i = 0; title[i]; ++i)
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*c++ = ((uint8_t *)title) [i];
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*c++ = ' ';
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*c++ = '0';
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*c++ = 'x';
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for (i = sizeof(void *); i > 0; --i) {
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uint8_t byte = pbuf.bytes[i - 1];
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if (!byte) continue;
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*c++ = HEX(byte >> 4);
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*c++ = HEX(byte & 0xF);
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}
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*c++ = '>';
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return gst_string_b(vm, buf, c - buf);
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}
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#undef GST_BUFSIZE
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/* Returns a string pointer or NULL if could not allocate memory. */
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const uint8_t *gst_to_string(Gst *vm, GstValue x) {
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switch (x.type) {
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case GST_NIL:
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return gst_string_c(vm, "nil");
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case GST_BOOLEAN:
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if (x.data.boolean)
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return gst_string_c(vm, "true");
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else
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return gst_string_c(vm, "false");
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case GST_REAL:
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return real_to_string(vm, x.data.real);
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case GST_INTEGER:
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return integer_to_string(vm, x.data.integer);
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case GST_ARRAY:
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return string_description(vm, "array", x.data.pointer);
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case GST_TUPLE:
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return string_description(vm, "tuple", x.data.pointer);
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case GST_STRUCT:
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return string_description(vm, "struct", x.data.pointer);
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case GST_TABLE:
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return string_description(vm, "table", x.data.pointer);
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case GST_STRING:
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return x.data.string;
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case GST_BYTEBUFFER:
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return string_description(vm, "buffer", x.data.pointer);
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case GST_CFUNCTION:
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return string_description(vm, "cfunction", x.data.pointer);
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case GST_FUNCTION:
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return string_description(vm, "function", x.data.pointer);
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case GST_THREAD:
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return string_description(vm, "thread", x.data.pointer);
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case GST_USERDATA:
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return string_udata(vm, gst_udata_type(x.data.pointer)->name, x.data.pointer);
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case GST_FUNCENV:
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return string_description(vm, "funcenv", x.data.pointer);
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case GST_FUNCDEF:
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return string_description(vm, "funcdef", x.data.pointer);
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}
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return NULL;
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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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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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hash = x.data.dwords[0] ^ x.data.dwords[1];
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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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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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