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450 lines
9.6 KiB
C
450 lines
9.6 KiB
C
#include <parser.h>
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#include "shelpers.h"
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#include "builtins.h"
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#include "stack.h"
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#include "ops.h"
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#include <ctype.h>
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#include <stdlib.h>
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#include <memory.h>
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#include <string.h>
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#define MAX_VARS 64
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#define MAX_STACK 32
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#define MAX_LINES 1000
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extern int atoi(const char *);
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extern float strtof(const char *, char **);
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void iinit(interpreter *interp)
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{
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interp->vars = (variable *)calloc(MAX_VARS, sizeof(variable));
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interp->vnames = (char **)calloc(MAX_VARS, sizeof(char *));
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interp->stack = (stack_t *)calloc(MAX_STACK, sizeof(stack_t));
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interp->stidx = 0;
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interp->lines = (variable ***)calloc(MAX_LINES, sizeof(variable **));
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interp->lnidx = 0;
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interp->indent = 0;
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interp->sindent = 0;
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interp->ret = 0;
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iload_core(interp);
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}
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void iend(interpreter *it)
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{
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for (unsigned int i = 0; i < MAX_VARS; i++) {
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if (it->vars[i].used == 1) {
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if (it->vars[i].valtype == STRING ||
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it->vars[i].valtype == EXPR)
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free((void *)it->vars[i].value.p);
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free(it->vnames[i]);
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}
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}
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for (unsigned int i = 0; i < MAX_LINES; i++) {
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if (it->lines[i] != 0) {
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for (unsigned int j = 0; (int32_t)it->lines[i][j] > 0; j++) {
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switch (it->lines[i][j]->valtype) {
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case STRING:
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case EXPR:
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free((void *)it->lines[i][j]->value.p);
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free(it->lines[i][j]);
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break;
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case NUMBER:
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if (!it->lines[i][j]->used)
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free(it->lines[i][j]);
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break;
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}
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}
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}
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free(it->lines[i]);
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}
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free(it->vars);
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free(it->vnames);
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free(it->stack);
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free(it->lines);
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}
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void iskip(interpreter *it)
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{
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if (!(it->sindent & SKIP))
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it->sindent = it->indent | SKIP;
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}
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variable *interpreter_get_variable(interpreter *interp, const char *name)
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{
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for (uint32_t i = 0; i < MAX_VARS; i++) {
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if (!interp->vars[i].used) {
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variable *v = make_vars(&interp->vars[i], 0);
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v->used = 1;
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interp->vnames[i] = strclone(name);
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return v;
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} else if (interp->vnames[i] != 0 && !strcmp(interp->vnames[i], name)) {
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return &interp->vars[i];
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}
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}
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return 0;
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}
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char *interpreter_get_name(interpreter *interp, variable *v)
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{
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for (uint32_t i = 0; i < MAX_VARS; i++) {
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if (v == &interp->vars[i])
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return interp->vnames[i];
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}
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return "(undefined)";
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}
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variable *inew_string(interpreter *interp, const char *name, const char *value)
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{
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variable *v = interpreter_get_variable(interp, name);
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if (v != 0) {
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v->valtype = STRING;
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if (v->value.p != 0)
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free((void *)v->value.p);
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v->value.p = (uint32_t)strclone(value);
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}
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return v;
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}
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variable *inew_number(interpreter *interp, const char *name, float value)
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{
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variable *v = interpreter_get_variable(interp, name);
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if (v != 0) {
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v->valtype = NUMBER;
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v->value.f = value;
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}
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return v;
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}
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variable *inew_cfunc(interpreter *interp, const char *name, func_t func)
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{
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variable *v = interpreter_get_variable(interp, name);
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if (v != 0) {
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v->fromc = 1;
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v->valtype = FUNC;
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v->value.p = (uint32_t)func;
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}
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return v;
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}
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variable *make_var(interpreter *interp, const char *line, uint32_t *next)
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{
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if (line[0] == '\"') { // string literal
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uint32_t end = 1;
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while (!eol(line[end])) {
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if (line[end] == '\"'/* && line[end - 1] != '\\'*/) {
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if (!eot(line[end + 1]))
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return 0;
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// TODO string breakdown
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*next = end + 1;
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char *str = strnclone(line + 1, end - 1);
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variable *v = make_vars(0, str);
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free(str);
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return v;
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}
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end++;
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}
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return 0;
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} else if (line[0] == '(') { // equation literal
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uint32_t end = findend(line, '(', ')');
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if (eot(line[end]))
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return 0;
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*next = end + 1;
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char *expr = strnclone(line + 1, end);
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variable *v = make_vare(0, expr);
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free(expr);
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return v;
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} else if (isalpha(line[0])) { // variable/func
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uint32_t end = 1;
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for (; isalnum(line[end]); end++);
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if (!eot(line[end]))
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return 0;
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char *name = (char *)malloc(end + 1);
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strncpy(name, line, end);
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name[end] = '\0';
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*next = end;
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variable *v = interpreter_get_variable(interp, name);
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free(name);
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return v;
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} else if (isdigit(line[0])) { // number
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uint32_t end = 1;
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uint8_t dec = 0;
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for (; !eot(line[end]); end++) {
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if (!isdigit(line[end])) {
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if (line[end] == '.') {
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if (!dec)
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dec = 1;
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else
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return 0;
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} else {
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return 0;
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}
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}
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}
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char *copy = (char *)malloc(end + 1);
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strncpy(copy, line, end);
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copy[end] = '\0';
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variable *v;
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if (dec)
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v = make_varn(0, strtof(copy, 0));
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else
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v = make_varn(0, (float)atoi(copy));
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free(copy);
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*next = end;
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return v;
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}
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return 0;
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}
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int idoline(interpreter *interp, const char *line)
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{
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uint32_t ooffset = 0, offset = 0, next;
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int fret = 0;
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if (line[0] == '\0')
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return 0;
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skipblank(line, eol, &offset);
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if (line[offset] == '#' || eol(line[offset]))
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return 0;
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variable **linebuf = (variable **)calloc(8, sizeof(variable *));
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interp->lines[interp->lnidx] = linebuf;
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variable **ops = interp->lines[interp->lnidx];
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// step 1 - convert to tokens
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while (!eol(line[offset])) {
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if (offset > 0 && line[offset] == '>') {
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offset++;
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skipblank(line, eol, &offset);
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variable *r = make_var(interp, line + offset, &next);
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ops[ooffset] = (void *)-1;
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ops[ooffset + 1] = r;
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offset += next;
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skipblank(line, eol, &offset);
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continue;
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}
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variable *v = make_var(interp, line + offset, &next);
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ops[ooffset] = v;
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if (ops[ooffset] == 0) {
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fret = -4;
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goto fail;
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} else {
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ooffset++;
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offset += next;
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}
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skipblank(line, eol, &offset);
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}
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// step 2 - execute
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if (ooffset == 0) {
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fret = -1;
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goto fail;
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}
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if (ops[0]->valtype != FUNC) {
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fret = -2;
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goto fail;
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}
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if (ops[0]->fromc && ops[0]->value.p == 0) {
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fret = -3;
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goto fail;
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}
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if (ops[ooffset] != (void *)-1)
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ops[ooffset] = 0;
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loop:
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for (uint8_t i = 0; i < IUP_COUNT; i++) {
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if (interp->lines[interp->lnidx][0]->value.p
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== (uint32_t)indent_up[i]) {
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interp->indent++;
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goto cont;
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}
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}
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for (uint8_t i = 0; i < IDOWN_COUNT; i++) {
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if (interp->lines[interp->lnidx][0]->value.p
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== (uint32_t)indent_down[i]) {
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if (--interp->indent < 0) {
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fret = -6;
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goto fail;
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}
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if (interp->indent < (interp->sindent & ~(SKIP)))
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interp->sindent &= ~(SKIP);
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else
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goto cont;
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break;
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}
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}
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cont:
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if (interp->indent > 0 && interp->sindent & SKIP)
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goto norun;
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ops = (variable **)malloc(8 * sizeof(variable *));
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for (uint8_t i = 0; i < 8; i++)
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ops[i] = interp->lines[interp->lnidx][i];
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uint32_t oldLnidx = interp->lnidx;
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// eval expressions
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ooffset = 1;
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for (; ops[ooffset] != 0 && ops[ooffset] != (void *)-1; ooffset++) {
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if (ops[ooffset]->valtype == EXPR) {
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char *expr = strclone((char *)ops[ooffset]->value.p);
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variable *r = idoexpr(interp, expr);
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ops[ooffset] = r;
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free(expr);
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}
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}
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if (ops[ooffset] == (void *)-1)
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interp->ret = ops[ooffset + 1];
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if (ops[0]->fromc) {
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for (uint32_t i = ooffset; --i > 0;)
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ipush(interp, ops[i]);
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int ret = ((func_t)ops[0]->value.p)(interp);
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if (ret != 0)
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return ret;
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ipopm(interp, ooffset - 1);
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} else {
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char an[6];
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for (uint32_t i = 1; i < ooffset; i++) {
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snprintf(an, 6, "arg%d", (int)(i - 1));
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switch (ops[i]->valtype) {
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case STRING:
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inew_string(interp, an, (char *)ops[i]->value.p);
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break;
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case NUMBER:
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inew_number(interp, an, ops[i]->value.f);
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break;
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default:
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break;
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}
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}
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ipush(interp, (void *)(interp->lnidx));
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interp->lnidx = ops[0]->value.p;
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interp->indent++;
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}
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if ((int32_t)interp->stidx < 0) {
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interp->stidx = 0;
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return -5;
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}
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for (uint32_t i = 1; i < ooffset; i++) {
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if (ops[i] != interp->lines[oldLnidx][i]) {
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if (ops[i]->valtype == STRING || ops[i]->valtype == EXPR)
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free((void *)ops[i]->value.p);
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free(ops[i]);
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}
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}
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free(ops);
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norun:
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interp->lnidx++;
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if (interp->lines[interp->lnidx] != 0)
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goto loop;
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return 0;
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fail:
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free(interp->lines[interp->lnidx]);
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interp->lines[interp->lnidx] = 0;
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return fret;
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}
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variable *idoexpr(interpreter *interp, const char *line)
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{
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void *ops[16];
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uint32_t ooffset = 0;
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uint32_t offset = 0;
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uint32_t next = 0;
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// step 1 - break apart line
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// skip whitespace
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skipblank(line, eol, &offset);
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while (!eoe(line[offset])) {
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if (line[offset] == '(') {
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uint8_t indent = 0;
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uint32_t i;
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for (i = offset + 1; !eol(line[i]); i++) {
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if (line[i] == '(') {
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indent++;
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} else if (line[i] == ')') {
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if (indent == 0) {
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break;
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} else {
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indent--;
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}
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}
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}
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if (eol(line[i]))
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return 0;
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ops[ooffset] = idoexpr(interp, line + offset + 1);
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offset = i + 1;
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} else {
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uint32_t len = offset;
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for (; isalnum(line[len]) || line[len] == '.'; len++);
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len -= offset;
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char *copy = (char *)malloc(len + 1);
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strncpy(copy, line + offset, len);
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copy[len] = '\0';
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variable *v = make_var(interp, copy, &next);
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free(copy);
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ops[ooffset] = v;
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offset += next;
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}
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if (ops[ooffset] == 0)
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return 0;
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ooffset++;
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// skip whitespace
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skipblank(line, eoe, &offset);
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if (eoe(line[offset]))
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break;
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for (uint32_t i = 0; i < IOPS_COUNT; i++) {
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int len = strlen(iops[i]);
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if (!strncmp(iops[i], line + offset, len)) {
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ops[ooffset] = (void *)(i + 1);
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offset += len;
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break;
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}
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}
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if (ops[ooffset] == 0)
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return 0;
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ooffset++;
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// skip whitespace
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skipblank(line, eol, &offset);
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}
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if (ooffset % 2 == 0)
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return 0;
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// step 2 - do operations
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variable *result = (variable *)calloc(1, sizeof(variable));
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result->valtype = ((variable *)ops[0])->valtype;
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result->value.p = ((variable *)ops[0])->value.p;
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for (uint32_t i = 1; i < ooffset; i += 2)
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iopfuncs[(uint32_t)ops[i] - 1](result, result, ops[i + 1]);
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for (uint32_t i = 0; i < ooffset; i += 2) {
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variable *v = (variable *)ops[i];
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if (!v->used) {
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if (v->valtype == STRING || v->valtype == EXPR)
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free((void *)v->value.p);
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free(ops[i]);
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}
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}
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return result;
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}
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