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A minimalistic programming language written in C89.
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ink/lib.c

788 строки
19 KiB
Исходник Вина История

#ifndef NOSTDLIB
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <ctype.h>
#endif
#include "ink.h"
#define INK_RESERVED (-1)
#define INK_FUNCTION_KW (-2)
#define INK_DO_KW (-3)
#define INK_END_KW (-4)
#define INK_LABEL (-5)
#define INK_RETURN (-6)
#define _KEYWORD_INK_FUNCTION "fn"
#define _KEYWORD_INK_DO "do"
#define _KEYWORD_INK_END "end"
#define _KEYWORD_INK_RETURN "return"
struct label {
int active;
int dest;
char* name;
};
#ifdef NOSTDLIB
static size_t strlen(const char* c) {
size_t j = 0;
while(*(c++)) {
j++;
}
return j;
}
static void* memcpy(void* _dest, const void* _src, size_t sz) {
char* dest = _dest;
const char* src = _src;
while(sz--) {
*(dest++) = *(src++);
}
return dest;
}
static int strcmp(const char* dest, const char* src) {
while(*dest != 0 && *src != 0) {
if(*(dest++) != *(src++)) {
return 1;
}
}
return 0;
}
static void* memmove(void* _dest, const void* _src, size_t sz) {
char* dest = _dest;
const char* src = _src;
if (src < dest) {
src += sz;
dest += sz;
while (sz-- > 0) {
*--dest = *--src;
}
} else {
while (sz-- > 0) {
*dest++ = *src++;
}
}
return dest;
}
static void* memset(void* _dest, int src, size_t sz) {
char* dest = _dest;
while(sz--) {
*(dest++) = src++;
}
return dest;
}
static int isspace(int d) {
return d == ' ' || d == '\t' || d == '\n';
}
static int isdigit(int d) {
return '0' <= d && d <= '9';
}
static int atoi(const char* c) {
int ret = 0;
while(*c) {
ret *= 10;
ret += *c - '0';
++c;
}
return ret;
}
#endif
void ink_add_native(struct context* ctx, const char* name, void(*value)(struct context*)) {
if(ctx->native_words == NULL) {
ctx->native_words = ctx->malloc(sizeof(struct native_fn) * 8);
ctx->native_words_top = 0;
ctx->native_words_capacity = 8;
} else if(ctx->native_words_top == ctx->native_words_capacity) {
int new_count = (ctx->native_words_capacity + ctx->native_words_capacity/2);
void* renewed = ctx->realloc(ctx->native_words, sizeof(struct native_fn) * new_count);
if(renewed == NULL) {
// TODO: error
} else {
ctx->native_words = renewed;
ctx->native_words_capacity = new_count;
}
}
int len = strlen(name);
char* copy = ctx->malloc(len+1);
if(copy == NULL) {
// TODO: error
}
memcpy(copy, name, len);
copy[len] = 0;
ctx->native_words[ctx->native_words_top].value = value;
ctx->native_words[ctx->native_words_top].name = copy;
ctx->native_words_top++;
}
static int ink_add_indigenous(struct context* ctx, const char* name, struct elem* m, size_t count) {
if(ctx->words == NULL) {
ctx->words = ctx->malloc(sizeof(struct fn) * 8);
ctx->words_top = 0;
ctx->words_capacity = 8;
} else if(ctx->words_top == ctx->words_capacity) {
int new_count = (ctx->words_capacity + ctx->words_capacity/2);
void* renewed = ctx->realloc(ctx->words, sizeof(struct native_fn) * new_count);
if(renewed == NULL) {
// TODO: error
} else {
ctx->words = renewed;
ctx->words_capacity = new_count;
}
}
int i;
for(i = 0; i < ctx->words_top; ++i) {
if(strcmp(name, ctx->words[i].name) == 0) {
ctx->free(ctx->words[i].things);
ctx->words[i].things = ctx->malloc(sizeof(struct elem) * count);
memcpy(ctx->words[i].things, m, sizeof(struct elem) * count);
ctx->words[i].size = count;
return i;
}
}
int len = strlen(name);
char* copy = ctx->malloc(len+1);
if(copy == NULL) {
// TODO: error
}
memcpy(copy, name, len);
copy[len] = 0;
ctx->words[ctx->words_top].things = ctx->malloc(sizeof(struct elem) * count);
memcpy(ctx->words[ctx->words_top].things, m, sizeof(struct elem) * count);
ctx->words[ctx->words_top].size = count;
ctx->words[ctx->words_top].name = copy;
return ctx->words_top++;
}
static int ink_add_lex_string(struct context* ctx, const char* name) {
int i;
if(ctx->lex_reserved_words == NULL) {
ctx->lex_reserved_words = ctx->malloc(sizeof(char*) * 8);
ctx->lex_reserved_words_top = 0;
ctx->lex_reserved_words_capacity = 8;
} else if(ctx->lex_reserved_words_top == ctx->lex_reserved_words_capacity) {
int new_count = (ctx->lex_reserved_words_capacity + ctx->lex_reserved_words_capacity/2);
void* renewed = ctx->realloc(ctx->lex_reserved_words, sizeof(struct native_fn) * new_count);
if(renewed == NULL) {
// TODO: error
} else {
ctx->lex_reserved_words = renewed;
ctx->lex_reserved_words_capacity = new_count;
}
}
for(i = 0; i < ctx->lex_reserved_words_top; i++) {
if(strcmp(ctx->lex_reserved_words[i], name) == 0) {
return i;
}
}
int len = strlen(name);
i = ctx->lex_reserved_words_top;
ctx->lex_reserved_words[i] = ctx->malloc(len+1);
memcpy(ctx->lex_reserved_words[i], name, len);
ctx->lex_reserved_words[i][len] = 0;
ctx->lex_reserved_words_top++;
return i;
}
void ink_push(struct context* ctx, struct elem value) {
if(ctx->stack == NULL) {
ctx->stack = ctx->malloc(sizeof(struct elem) * 8);
ctx->top = 0;
ctx->capacity = 8;
} else if(ctx->top == ctx->capacity) {
int new_count = (ctx->capacity + ctx->capacity/2);
void* renewed = ctx->realloc(ctx->stack, sizeof(struct elem) * new_count);
if(renewed == NULL) {
// TODO: error
} else {
ctx->stack = renewed;
ctx->capacity = new_count;
}
}
ctx->stack[ctx->top] = value;
ctx->top++;
}
void ink_push_fn(struct context* ctx, struct stack_frame value) {
if(ctx->function_stack == NULL) {
ctx->function_stack = ctx->malloc(sizeof(struct stack_frame) * 8);
ctx->function_stack_top = 0;
ctx->function_stack_capacity = 8;
} else if(ctx->function_stack_top == ctx->function_stack_capacity) {
int new_count = (ctx->function_stack_capacity + ctx->function_stack_capacity/2);
void* renewed = ctx->realloc(ctx->function_stack, sizeof(struct stack_frame) * new_count);
if(renewed == NULL) {
// TODO: error
} else {
ctx->function_stack = renewed;
ctx->function_stack_capacity = new_count;
}
}
ctx->function_stack[ctx->function_stack_top] = value;
ctx->function_stack_top++;
}
static void ink_pop_fn(struct context* ctx) {
if(ctx->function_stack == NULL) return;
if(ctx->function_stack_top == 0) return;
ctx->function_stack_top--;
}
static void ink_pop(struct context* ctx) {
if(ctx->stack == NULL) return;
if(ctx->top == 0) return;
ctx->top--;
}
struct context* ink_make_context(void*(*malloc)(size_t), void*(*realloc)(void*, size_t), void(*free)(void*), int(*putchar)(int)) {
struct context* ctx = (struct context*)malloc(sizeof(struct context));
ctx->malloc = malloc;
ctx->realloc = realloc;
ctx->free = free;
ctx->putchar = putchar;
ctx->panic = 0;
ctx->stack = NULL;
ctx->capacity = 0;
ctx->top = 0;
ctx->function_stack = NULL;
ctx->function_stack_capacity = 0;
ctx->function_stack_top = 0;
ctx->native_words = NULL;
ctx->native_words_capacity = 0;
ctx->native_words_top = 0;
ctx->words = NULL;
ctx->words_capacity = 0;
ctx->words_top = 0;
ctx->lex_reserved_words = NULL;
ctx->lex_reserved_words_capacity = 0;
ctx->lex_reserved_words_top = 0;
return ctx;
}
/**
* Allocates a string that contains the integer
* @param _ context (used to allocate)
* @param cpy the value
* @return the allocated string, needs to be freed by ctx->free
*/
static char* ink_itoa(struct context* _, int cpy) {
char* n = _->malloc(16);
n[15] = 0;
char* it = n+15;
do {
it--;
*it = (cpy % 10) + '0';
cpy = cpy / 10;
} while(cpy);
memmove(n, it, 16 - (it-n));
return n;
}
static void print_stacktrace(struct context* _) {
int i = 0;
for(; i < _->function_stack_top; ++i) {
struct elem thing = _->function_stack[i].executing;
switch(thing.type) {
case INK_NATIVE_FUNCTION: {
char *n = _->native_words[thing.value].name;
while (*n) {
_->putchar(*n);
++n;
}
_->putchar(10);
break;
}
case INK_FUNCTION:{
char *n = _->native_words[thing.value].name;
while (*n) {
_->putchar(*n);
++n;
}
_->putchar(':');
n = ink_itoa(_, _->function_stack[i].index);
while (*n) {
_->putchar(*n);
++n;
}
_->free(n);
_->putchar(10);
break;
}
default:
break;
}
}
}
static void add_int(struct context* ctx) {
if(ctx->top < 2) {
ctx->panic = 1;
return;
}
struct elem a = ctx->stack[ctx->top-1];
struct elem b = ctx->stack[ctx->top-2];
if(!(a.type == INK_INTEGER && b.type == INK_INTEGER)) {
ctx->panic = 1;
return;
}
ink_pop(ctx);
ctx->stack[ctx->top-1].value = a.value + b.value;
}
static void dupe_elem(struct context* ctx) {
if(ctx->top < 1) {
ctx->panic = 1;
return;
}
struct elem a = ctx->stack[ctx->top-1];
ink_push(ctx, a);
}
static void drop_elem(struct context* ctx) {
if(ctx->top < 1) {
ctx->panic = 1;
return;
}
ink_pop(ctx);
}
static void pluck_elem(struct context* ctx) {
if(ctx->top < 1) {
ctx->panic = 1;
return;
}
struct elem a = ctx->stack[ctx->top-1];
if(a.type != INK_INTEGER) {
ctx->panic = 1;
return;
}
int position = ctx->top - (a.value + 1);
if(position >= ctx->top || position < 0) {
ctx->panic = 1;
return;
}
ink_pop(ctx);
ink_push(ctx, ctx->stack[position]);
}
static void swap_elem(struct context* ctx) {
if(ctx->top < 2) {
ctx->panic = 1;
return;
}
struct elem a = ctx->stack[ctx->top-1];
struct elem b = ctx->stack[ctx->top-2];
ctx->stack[ctx->top-2] = a;
ctx->stack[ctx->top-1] = b;
}
static void return_if(struct context* ctx) {
if(ctx->top < 1) {
ctx->panic = 1;
return;
}
struct elem a = ctx->stack[ctx->top-1];
if(a.type != INK_INTEGER) {
ctx->panic = 1;
return;
}
if(a.value) {
ink_pop_fn(ctx);
ink_pop_fn(ctx);
}
ink_pop(ctx);
return;
}
static void jump_if(struct context* ctx) {
if(ctx->top < 1) {
ctx->panic = 1;
return;
}
struct elem a = ctx->stack[ctx->top-1];
if(a.type != INK_INTEGER) {
ctx->panic = 1;
return;
}
ink_pop(ctx);
if(a.value) {
ink_pop_fn(ctx);
a = ctx->stack[ctx->top-1];
ctx->function_stack[ctx->function_stack_top - 1].index += a.value - 3;
ink_pop(ctx);
//printf("\t*%d\n", ctx->function_stack[ctx->function_stack_top - 1].index);
}
return;
}
static void print_int(struct context* ctx) {
if(ctx->top < 1 || ctx->stack[ctx->top-1].type != INK_INTEGER) {
ctx->panic = 1;
return;
}
struct elem a = ctx->stack[ctx->top-1];
ink_pop(ctx);
char* n = ink_itoa(ctx, a.value);
char* str = n;
while (*str) {
ctx->putchar(*str);
++str;
}
ctx->free(n);
}
static void print_as_utf8(struct context* ctx) {
if(ctx->top < 1 || ctx->stack[ctx->top-1].type != INK_INTEGER) {
ctx->panic = 1;
return;
}
struct elem a = ctx->stack[ctx->top-1];
if(a.value <= 0x7F) {
ctx->putchar(a.value);
} else if(a.value <= 0x7FF) {
ctx->putchar(((a.value & 0xFC0) >> 6) | 192);
ctx->putchar((a.value & 0x3F) | 128);
} else if(a.value <= 0xFFFF) {
ctx->putchar(((a.value & 0x3F000) >> 12) | 224);
ctx->putchar(((a.value & 0xFC0) >> 6) | 128);
ctx->putchar((a.value & 0x3F) | 128);
} else if(a.value <= 0x10FFFF) {
ctx->putchar(((a.value & 0x3C0000) >> 18) | 240);
ctx->putchar(((a.value & 0x3F000) >> 12) | 128);
ctx->putchar(((a.value & 0xFC0) >> 6) | 128);
ctx->putchar((a.value & 0x3F) | 128);
} else {
ctx->panic = 1;
return;
}
ink_pop(ctx);
}
#ifndef NOSTDLIB
struct context* ink_make_default_context() {
struct context* ctx = ink_make_context(malloc, realloc, free, putchar);
ink_add_native(ctx, "trace", print_stacktrace);
ink_add_native(ctx, "print_int", print_int);
ink_add_native(ctx, "print_utf8", print_as_utf8);
ink_add_native(ctx, "+", add_int);
ink_add_native(ctx, "swap", swap_elem);
ink_add_native(ctx, "dup", dupe_elem);
ink_add_native(ctx, "drop", drop_elem);
ink_add_native(ctx, "pluck", pluck_elem);
ink_add_native(ctx, "return_if", return_if);
ink_add_native(ctx, "jump_if", jump_if);
return ctx;
}
#endif
static void ink_consume_one(int* end, struct context* pContext, char** buffer, char* r) {
int i;
if(*end == 0) {
return;
}
r[*end] = 0;
int done = 0;
if (strcmp(r, _KEYWORD_INK_FUNCTION) == 0) {
struct elem value;
value.value = 0;
value.type = INK_FUNCTION_KW;
ink_push(pContext, value);
done = 1;
}
if (!done && strcmp(r, _KEYWORD_INK_DO) == 0) {
struct elem value;
value.value = 0;
value.type = INK_DO_KW;
ink_push(pContext, value);
done = 1;
}
if (!done && strcmp(r, _KEYWORD_INK_END) == 0) {
struct elem value;
value.value = 0;
value.type = INK_END_KW;
ink_push(pContext, value);
done = 1;
}
if (!done && strcmp(r, _KEYWORD_INK_RETURN) == 0) {
struct elem value;
value.value = 0;
value.type = INK_RETURN;
ink_push(pContext, value);
done = 1;
}
if (!done) {
for (i = 0; i < pContext->words_top; ++i) {
if (strcmp(r, pContext->words[i].name) == 0) {
struct elem value;
value.value = i;
value.type = INK_FUNCTION;
ink_push(pContext, value);
done = 1;
break;
}
}
}
if (!done) {
for (i = 0; i < pContext->native_words_top; ++i) {
if (strcmp(r, pContext->native_words[i].name) == 0) {
struct elem value;
value.value = i;
value.type = INK_NATIVE_FUNCTION;
ink_push(pContext, value);
done = 1;
break;
}
}
}
if (!done) {
for(i = (r[0] == '-'); i < *end; i++) {
if(!isdigit(r[i])){
goto not_an_int;
}
}
struct elem value;
value.value = atoi(r);
value.type = INK_INTEGER;
ink_push(pContext, value);
done = 1;
}
not_an_int: if (!done) {
i = ink_add_lex_string(pContext, r);
struct elem value;
value.value = i;
if(r[strlen(r) - 1] == ':') {
value.type = INK_LABEL;
} else {
value.type = INK_RESERVED;
}
ink_push(pContext, value);
}
*end = 0;
}
static void ink_lex(struct context *pContext, char* buffer) {
int i;
char r[128];
int end = 0;
while(*buffer != 0) {
if(isspace(*buffer)) {
ink_consume_one(&end, pContext, &buffer, r);
} else {
r[end] = *buffer;
++end;
}
++buffer;
}
ink_consume_one(&end, pContext, &buffer, r);
}
static int lblcmp(const char* label, const char* other, size_t label_sz) {
while (label_sz != 1) {
if(*other == 0) return 1;
if(*label != *other) return 1;
++label;
++other;
label_sz--;
}
return 0;
}
/**
*
* @param pContext
* @param executable_buffer
* @param executable_buffer_top
* @internal Loop from hell
*/
static void ink_parse(struct context* pContext, struct elem* executable_buffer, int* executable_buffer_top) {
int i;
#define LABEL_BUFFER 128
#define FUNCTION_BUFFER 256
struct label labels[LABEL_BUFFER];
struct elem function_buffer[FUNCTION_BUFFER];
int function_buffer_top = 0;
int function_name = -1;
#define MODE_EXECUTABLE 0
#define MODE_FUNCTION 1
#define MODE_DO 2
int mode = 0;
memset(labels, 0, sizeof(struct label)*LABEL_BUFFER);
for(i = 0; i < pContext->top; ++i) {
struct elem current = pContext->stack[i];
switch (mode) {
case MODE_EXECUTABLE:
switch(current.type) {
case INK_FUNCTION_KW:
mode = MODE_FUNCTION;
goto next_token;
case INK_DO_KW:
case INK_END_KW:
// TODO: error
default:
executable_buffer[*executable_buffer_top] = current;
*executable_buffer_top += 1;
}
break;
case MODE_FUNCTION:
if(current.type == INK_DO_KW) {
if(function_name == -1) {
// TODO: error (function name was not supplied)
} else {
mode = MODE_DO;
memset(labels, 0, sizeof(struct label)*128);
goto next_token;
}
}
if(function_name != -1) {
// TODO: error (function name supplied already)
}
if(current.type != INK_RESERVED) {
// TODO: error
}
function_name = current.value;
break;
case MODE_DO:
if(current.type == INK_END_KW) {
int j;
for(j = 0; j < function_buffer_top; j++) {
struct elem pt = function_buffer[j];
if(pt.type == INK_LABEL) {
int k;
for(k = 0; k < LABEL_BUFFER; k++) {
if(labels[k].active) {
if(strcmp(labels[k].name, pContext->lex_reserved_words[pt.value]) == 0) {
labels[k].dest = j;
// TODO: error
break;
}
} else {
labels[k].active = 1;
labels[k].name = pContext->lex_reserved_words[pt.value];
labels[k].dest = j;
memcpy(function_buffer+j, function_buffer+j+1, sizeof(struct elem)*(function_buffer_top-j-1));
function_buffer_top--;
j--;
break;
}
}
}
}
for(j = 0; j < function_buffer_top; j++) {
struct elem pt = function_buffer[j];
if(pt.type == INK_RESERVED) {
const char* str = pContext->lex_reserved_words[pt.value];
int k;
for(k = 0; k < LABEL_BUFFER; k++) {
if(labels[k].active) {
const char* lbl = labels[k].name;
int label_sz = strlen(lbl);
if(lblcmp(labels[k].name, pContext->lex_reserved_words[pt.value], label_sz) == 0) {
function_buffer[j].type = INK_INTEGER;
function_buffer[j].value = labels[k].dest - j;
break;
}
} else break;
}
}
}
ink_add_indigenous(pContext, pContext->lex_reserved_words[function_name], function_buffer, function_buffer_top);
function_buffer_top = 0;
mode = MODE_EXECUTABLE;
goto next_token;
}
function_buffer[function_buffer_top] = current;
function_buffer_top += 1;
break;
}
next_token: i=i;
}
if(mode == MODE_FUNCTION || mode == MODE_DO) {
// error, missing an end
}
#undef MODE_EXECUTABLE
#undef MODE_FUNCTION
#undef MODE_DO
#undef LABEL_BUFFER
#undef FUNCTION_BUFFER
}
int ink_step(struct context *pContext) {
if(pContext->function_stack_top == 0) return 0;
if(pContext->panic) {
return -1;
}
struct stack_frame* top = &pContext->function_stack[pContext->function_stack_top-1];
switch(top->executing.type) {
case INK_NATIVE_FUNCTION:
if(top->index != 0) {
ink_pop_fn(pContext);
} else {
top->index++;
if(pContext->native_words_top <= top->executing.value) {
pContext->panic = 1;
return -1;
}
pContext->native_words[top->executing.value].value(pContext);
}
break;
case INK_FUNCTION:
if(pContext->words_top <= top->executing.value) {
pContext->panic = 1;
return -1;
}
if(top->index >= pContext->words[top->executing.value].size) {
ink_pop_fn(pContext);
} else {
struct elem next = pContext->words[top->executing.value].things[top->index];
if(next.type == INK_RETURN) {
ink_pop_fn(pContext);
return 1;
}
struct stack_frame frame;
frame.executing = next;
frame.index = 0;
ink_push_fn(pContext, frame);
top->index++;
}
break;
default:
ink_push(pContext, top->executing);
ink_pop_fn(pContext);
break;
}
return 1;
}
void ink_run(struct context *pContext, char* buffer) {
pContext->free(pContext->stack);
pContext->stack = NULL;
pContext->top = 0;
pContext->capacity = 0;
ink_lex(pContext, buffer);
int i = 0;
struct elem executable_buffer[256];
int executable_buffer_top = 0;
ink_parse(pContext, executable_buffer, &executable_buffer_top);
struct stack_frame frame;
frame.executing.value = ink_add_indigenous(pContext, "__-MAIN-__", executable_buffer, executable_buffer_top);
frame.executing.type = INK_FUNCTION;
frame.index = 0;
ink_push_fn(pContext, frame);
int out;
do {
out = ink_step(pContext);
} while(out > 0);
}