convert input parsing to pluggable specs

master
Ondřej Hruška 3 years ago
parent cab55d835b
commit ab1b39598c
Signed by: MightyPork
GPG Key ID: 2C5FD5035250423D
  1. 1
      CMakeLists.txt
  2. 2
      include/fh_config.h
  3. 46
      include/fh_input.h
  4. 7
      include/fh_runtime.h
  5. 1
      include/forth.h
  6. 1
      include/forth_internal.h
  7. 191
      src/fh_input.c
  8. 70
      src/fh_parse.c
  9. 48
      src/main.c

@ -19,6 +19,7 @@ add_executable(forth
src/fh_error.c
src/fh_see.c
src/fh_parse.c
src/fh_input.c
)
target_include_directories(forth PRIVATE include)

@ -34,4 +34,6 @@
#define MAGICADDR_UNRESOLVED 0xFFFFFBADULL
#define MAGICADDR_ENDCASE_UNRESOLVED 0xFFFC5BADULL
#define FH_PROMPT_STR "> "
#endif //FORTH_FH_CONFIG_H

@ -0,0 +1,46 @@
/**
* TODO file description
*
* Created on 2021/11/21.
*/
#ifndef FORTH_FH_INPUT_H
#define FORTH_FH_INPUT_H
struct fh_thread_s;
struct fh_input_spec_s;
/** Refill the input buffer, returns false on failure / EOF */
typedef bool (*fh_input_refill_t)(struct fh_thread_s *fh, struct fh_input_spec_s *spec);
/** Spec free func */
typedef void (*fh_input_free_t)(void *spec);
struct fh_input_spec_s {
struct fh_input_spec_s *previous;
fh_input_refill_t refill_input_buffer;
fh_input_free_t free_self;
uint32_t linenum;
// saved values, filled when pushing
char saved_buffer[INPUT_BUFFER_SIZE];
uint32_t saved_inputptr;
uint32_t saved_inputlen;
};
/**
* Push current input spec and state, replace with new one
*/
void fh_push_input(struct fh_thread_s *fh, struct fh_input_spec_s *newinput);
/**
* Discard current input spec, restore previous.
* fh->input will be NULL if this was the topmost one
*/
void fh_pop_input(struct fh_thread_s *fh);
struct fh_input_spec_s *fh_create_input_from_filename(char *path);
struct fh_input_spec_s *fh_create_input_from_filestruct(FILE *f);
struct fh_input_spec_s *fh_create_input_from_string(char *str, size_t len);
void fh_input_teardown(struct fh_thread_s *fh);
#endif //FORTH_FH_INPUT_H

@ -217,6 +217,9 @@ struct fh_thread_s {
uint32_t parse_if_level;
bool executing_compiled;
/** Input spec */
struct fh_input_spec_s *input;
};
enum fh_error fh_loop_nest(struct fh_thread_s *fh, uint32_t indexvalue);
@ -265,7 +268,9 @@ enum fh_error fh_find_word(struct fh_thread_s *fh, const char *name, size_t word
enum fh_error fh_init(struct fh_thread_s *fh);
enum fh_error fh_process_line(struct fh_thread_s *fh, const char *linebuf, size_t len);
//enum fh_error fh_process_line(struct fh_thread_s *fh, const char *linebuf, size_t len);
enum fh_error fh_runtime_start(struct fh_thread_s *fh, struct fh_input_spec_s *input);
static inline uint32_t word_addr(struct fh_thread_s *fh, const struct fh_word_s *w)
{

@ -14,6 +14,7 @@
#include "fh_config.h"
#include "fh_error.h"
#include "fh_globals.h"
#include "fh_input.h"
#include "fh_runtime.h"
#include "fh_print.h"

@ -23,6 +23,7 @@
#include "fh_helpers.h"
#include "fh_globals.h"
#include "fh_print.h"
#include "fh_input.h"
#include "fh_runtime.h"
#include "fh_mem.h"
#include "fh_stack.h"

@ -0,0 +1,191 @@
#include "forth_internal.h"
void fh_push_input(struct fh_thread_s *fh, struct fh_input_spec_s *newinput)
{
if (newinput == NULL) {
LOGE("push input with NULL");
return;
}
struct fh_input_spec_s *oldinput = fh->input;
if (NULL == oldinput) {
// no previous input spec, just use the new one
fh->input = newinput;
return;
}
fh->input = NULL;
memcpy(&oldinput->saved_buffer[0], &fh->heap[INPUTBUF_ADDR], INPUT_BUFFER_SIZE);
oldinput->saved_inputlen = fh->inputlen;
oldinput->saved_inputptr = fh->inputptr;
newinput->previous = oldinput;
fh->input = newinput;
}
void fh_pop_input(struct fh_thread_s *fh)
{
struct fh_input_spec_s *discarded = fh->input;
fh->input = NULL;
struct fh_input_spec_s *restored = discarded->previous;
if (!restored) {
return;
}
fh->input = restored; // this can be NULL, that must be checked by caller.
memcpy(&fh->heap[INPUTBUF_ADDR], &restored->saved_buffer[0], INPUT_BUFFER_SIZE);
fh->inputlen = restored->saved_inputlen;
fh->inputptr = restored->saved_inputptr;
if (discarded->free_self) {
discarded->free_self(discarded);
}
}
struct file_input_spec {
struct fh_input_spec_s spec;
FILE *file;
};
struct string_input_spec {
struct fh_input_spec_s spec;
char *str;
size_t len;
size_t readpos;
};
static inline uint8_t *inputbuf_at(struct fh_thread_s *fh, size_t pos)
{
return &fh->heap[INPUTBUF_ADDR + pos];
}
void fh_input_memmove_leftovers(struct fh_thread_s *fh)
{
if (fh->inputptr < fh->inputlen) {
// something is left
uint32_t remains = fh->inputlen - fh->inputptr;
if (remains > 0) {
LOG("Refill, reuse %d bytes left in buffer", remains);
memmove(inputbuf_at(fh, 0), inputbuf_at(fh, fh->inputptr), remains);
fh->inputptr = 0;
fh->inputlen = remains;
} else {
LOG("Refill, nothing reused (1)");
fh->inputptr = 0;
fh->inputlen = 0;
}
} else {
LOG("Refill, nothing reused (2)");
fh->inputptr = 0;
fh->inputlen = 0;
}
}
static bool file_refill(struct fh_thread_s *fh, struct fh_input_spec_s *spec)
{
struct file_input_spec *fis = (struct file_input_spec *) spec;
fh_input_memmove_leftovers(fh);
uint32_t space_left = INPUT_BUFFER_SIZE - fh->inputlen;
char *wp = (char *) inputbuf_at(fh, fh->inputptr);
LOG("spec %p, fgets %d", spec, space_left);
if (fgets(wp, (int) space_left, fis->file)) {
spec->linenum++;
fh->inputlen = strnlen(wp, INPUT_BUFFER_SIZE);
return true;
} else {
return fh->inputptr > fh->inputlen; // return false only if there is nothing left
}
}
static bool str_refill(struct fh_thread_s *fh, struct fh_input_spec_s *spec)
{
struct string_input_spec *fis = (struct string_input_spec *) spec;
fh_input_memmove_leftovers(fh);
uint32_t space_left = INPUTBUF_ADDR - fh->inputlen;
char *wp = (char *) inputbuf_at(fh, fh->inputptr);
uint32_t chars_remaining_in_string = fis->len - fis->readpos;
if (chars_remaining_in_string > 0) {
if (chars_remaining_in_string < space_left) {
space_left = chars_remaining_in_string;
}
memcpy(wp, &fis->str[fis->readpos], space_left);
return true;
} else {
return false;
}
}
static void free_filespec(void *p)
{
struct file_input_spec *spec = (struct file_input_spec *) p;
if (spec->file != stdin) {
fclose(spec->file);
spec->file = NULL;
}
free(spec);
}
struct fh_input_spec_s *fh_create_input_from_filestruct(FILE *f)
{
struct file_input_spec *spec = calloc(sizeof(struct file_input_spec), 1);
if (!spec) {
return NULL;
}
spec->spec.free_self = free;
spec->spec.refill_input_buffer = file_refill;
spec->file = f;
return (struct fh_input_spec_s*) spec;
}
struct fh_input_spec_s *fh_create_input_from_filename(char *path)
{
struct file_input_spec *spec = calloc(sizeof(struct file_input_spec), 1);
if (!spec) {
return NULL;
}
FILE *f = fopen(path, "r");
if (!f) {
free(spec);
return NULL;
}
spec->spec.free_self = free_filespec;
spec->spec.refill_input_buffer = file_refill;
spec->file = f;
return (struct fh_input_spec_s*) spec;
}
struct fh_input_spec_s *fh_create_input_from_string(char *str, size_t len)
{
struct string_input_spec *spec = calloc(sizeof(struct string_input_spec), 1);
if (!spec) {
return NULL;
}
spec->spec.free_self = free;
spec->spec.refill_input_buffer = str_refill;
spec->str = str;
spec->readpos = 0;
spec->len = len;
return (struct fh_input_spec_s*) spec;
}
void fh_input_teardown(struct fh_thread_s *fh)
{
struct fh_input_spec_s *s = fh->input;
if (!s) return;
while (s) {
struct fh_input_spec_s *prev = s->previous;
if (s->free_self) {
s->free_self(s);
}
s = prev;
}
}

@ -221,8 +221,72 @@ enum fh_error fh_input_read_quotedstring(struct fh_thread_s *fh, bool escaped, c
return FH_ERR_SYNTAX;
}
enum fh_error fh_process_line(struct fh_thread_s *fh);
enum fh_error fh_runtime_start(struct fh_thread_s *fh, struct fh_input_spec_s *input)
{
enum fh_error rv;
fh_push_input(fh, input);
if (fh_globals.interactive) {
FHPRINT("%s", FH_PROMPT_STR);
}
while (1) {
LOG("Refill input buffer");
if (fh->input->refill_input_buffer(fh, fh->input)) {
// discard spaces at the end
while (isspace(fh->heap[INPUTBUF_ADDR + fh->inputlen - 1]) && fh->inputlen > 0) {
fh->heap[INPUTBUF_ADDR + fh->inputlen - 1] = 0;
fh->inputlen--;
}
if (fh->inputlen == 0) {
continue;
}
rv = fh_process_line(fh);
if (rv == FH_OK) {
if (fh_globals.interactive || fh_globals.echo) {
FHPRINT_SVC(" ok\n");
}
} else {
LOGE("ERROR %s on line %d", fherr_name(rv), fh->input->linenum);
if (!fh_globals.interactive) {
if (fh_globals.rescue) {
fh_globals.interactive = 1;
fh_input_teardown(fh);
fh_push_input(fh, fh_create_input_from_filestruct(stdin));
} else {
return 1;
}
}
/* reset state */
fh_setstate(fh, FH_STATE_INTERPRET, FH_SUBSTATE_NONE);
// reset stack pointers
fh->data_stack_top = 0;
fh->return_stack_top = 0;
}
if (fh_globals.interactive) {
FHPRINT("%s", FH_PROMPT_STR);
}
} else {
LOG("Pop input");
fh_pop_input(fh);
if (!fh->input) {
// we are done.
break;
}
}
}
return FH_OK;
}
/** Process a line read from input */
enum fh_error fh_process_line(struct fh_thread_s *fh, const char *linebuf, size_t len)
enum fh_error fh_process_line(struct fh_thread_s *fh)
{
enum fh_error rv;
@ -230,12 +294,12 @@ enum fh_error fh_process_line(struct fh_thread_s *fh, const char *linebuf, size_
#define ReadPos (fh->inputptr)
#define ReadLen (fh->inputlen)
fh_fill_input_buffer(fh, linebuf, len);
//fh_fill_input_buffer(fh, linebuf, len);
char c;
if (fh_globals.echo && !fh_globals.interactive) {
LOGI("%s", linebuf);
LOGI("%.*s", ReadLen, ReadPtr);
}
while (ReadPos < ReadLen && fh->state != FH_STATE_SHUTDOWN) {

@ -63,53 +63,7 @@ int main(int argc, char *argv[])
return 1;
}
const char *prompt = "> ";
/* process input line by line */
int linecnt = 0;
char linebuf[MAXLINE];
if (fh_globals.interactive) {
FHPRINT("%s", prompt);
}
while (fh.state != FH_STATE_SHUTDOWN && fgets(linebuf, MAXLINE, infile)) {
linecnt++;
// trim
size_t end = strlen(linebuf) - 1;
while (isspace(linebuf[end])) {
linebuf[end] = 0;
}
if (!linebuf[0]) {
continue;
}
rv = fh_process_line(&fh, linebuf, strlen(linebuf));
if (rv == FH_OK) {
if (fh_globals.interactive || fh_globals.echo) {
FHPRINT_SVC(" ok\n");
}
} else {
LOGE("ERROR %s on line %d", fherr_name(rv), linecnt);
if (!fh_globals.interactive) {
if (fh_globals.rescue) {
fh_globals.interactive = 1;
infile = stdin;
} else {
return 1;
}
}
/* reset state */
fh_setstate(&fh, FH_STATE_INTERPRET, FH_SUBSTATE_NONE);
// reset stack pointers
fh.data_stack_top = 0;
fh.return_stack_top = 0;
}
if (fh_globals.interactive) {
FHPRINT("%s", prompt);
}
}
fh_runtime_start(&fh, fh_create_input_from_filestruct(infile));
// Show resource usage
LOG("\nResources used: DS %dW, RS %dW, memory %dB\n",

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