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#include <parser.h>
#include <stdbool.h>
#include <stdlib.h>
static const char *interpreter_operators = "=(";
bool strcmp(const char *a, const char *b)
{
int i = 0;
for (; a[i] == b[i] && a[i] != '\0'; i++);
return a[i] == b[i];
}
bool strncmp(const char *a, const char *b, int count)
{
int i = 0;
for (; a[i] == b[i] && i < count; i++);
return i == count;
}
uint8_t isalpha(char c)
{
return (c >= 'A' && c <= 'Z') || (c >= 'a' && c <= 'z');
}
uint8_t isnum(char c)
{
return (c >= '0' && c <= '9');
}
uint8_t isname(char c)
{
return isalpha(c) || isnum(c);
}
uint8_t isspace(char c)
{
return (c == ' ' || c == '\t' || c == '\n');
}
uint8_t isoper(char c)
{
for (uint8_t i = 0; i < sizeof(interpreter_operators); i++) {
if (c == interpreter_operators[i])
return 1;
}
return 0;
}
void interpreter_init(interpreter *interp)
{
interp->status = READY;
interp->vcount = 0;
interp->vars = (variable *)calloc(32, sizeof(variable));
interp->names = (char **)calloc(32, sizeof(char *));
interp->stack = (stack_t *)calloc(64, sizeof(stack_t));
}
void interpreter_define_value(interpreter *interp, const char *name, int32_t value)
{
interp->names[interp->vcount] = (char *)name;
interp->vars[interp->vcount].nameidx = interp->vcount;
interp->vars[interp->vcount].type = VALUE;
interp->vars[interp->vcount].value = (uint32_t)value;
interp->vcount++;
}
void interpreter_define_cfunc(interpreter *interp, const char *name, func_t addr)
{
interp->names[interp->vcount] = (char *)name;
interp->vars[interp->vcount].nameidx = interp->vcount;
interp->vars[interp->vcount].type = CFUNCTION;
interp->vars[interp->vcount].value = (uint32_t)addr;
interp->vcount++;
}
int32_t interpreter_get_value(interpreter *interp, const char *name)
{
for (uint16_t i = 0; i < interp->vcount; i++) {
if (!strcmp(interp->names[i], name))
return (int32_t)interp->vars[i].value;
}
return 0;
}
/**
* doline section
*/
bool namencmp(const char *name, const char *s)
{
uint16_t i;
for (i = 0; name[i] == s[i] && s[i] != '\0'; i++);
return (name[i] == '\0' && !isname(s[i]));
}
uint16_t spacecount(const char *s)
{
uint16_t i;
for (i = 0; isspace(s[i]); i++);
return i;
}
char *copystr(const char *s, char end)
{
uint16_t len = 0;
while (s[len++] != end);
char *buf = (char *)malloc(len);
for (uint16_t i = 0; i < len; i++)
buf[i] = s[i];
return buf;
}
char *copysubstr(const char *s, int end)
{
char *buf = (char *)malloc(end);
for (uint16_t i = 0; i < end; i++)
buf[i] = s[i];
return buf;
}
variable *interpreter_getvar(interpreter *interp, const char *line)
{
for (uint16_t i = 0; i < interp->vcount; i++) {
if (namencmp(interp->names[i], line))
return &interp->vars[i];
}
return 0;
}
int interpreter_doline(interpreter *interp, const char *line)
{
variable *bits[16];
uint16_t offset = 0, boffset = 0;
// check for var/func set or usage
int end;
getvar:
for (end = 0; isname(line[end]); end++);
variable *var = interpreter_getvar(interp, line);
if (var != 0) {
bits[boffset++] = var;
} else {
// defining new variable
interpreter_define_value(interp, copysubstr(line, end), 0);
goto getvar; // try again
}
// skip whitespace/name
offset += end;
offset += spacecount(line + offset);
if (boffset == 0 && line[offset] != '=')
return -1; // variable not found
// find operator
if (line[offset] == '\0') {
// print value
return -99;
} else if (line[offset] == '=') {
// assignment/expression
offset++;
offset += spacecount(line + offset);
bits[0]->value = (uint32_t)copystr(line + offset, '\0');
} else if (line[offset] == '(') {
// function call
offset++;
if (bits[0]->type != FUNCTION && bits[0]->type != CFUNCTION)
return -2;
offset += spacecount(line + offset);
// collect arg offsets
uint16_t offsets[8];
uint8_t ooffset = 0;
while (line[offset] != ')' && line[offset] != '\0') {
offsets[ooffset] = offset;
offset += spacecount(line + offset);
uint8_t isvn = 1;
do {
if (line[offset] == ' ' || line[offset] == '\t') {
offset += spacecount(line + offset);
isvn = 0;
}
if (line[offset] == ',') {
offset++;
ooffset++;
break;
} else if (line[offset] == ')') {
ooffset++;
break;
} else if (isvn == 0) {
return -3;
}
} while (++offset);
}
// populate stack
for (uint8_t i = 0; i < ooffset; i++) {
uint16_t j;
for (j = offsets[i]; line[j] != ' ' && line[j] != '\t' &&
line[j] != ',' && line[j] != ')'; j++);
j -= offsets[i];
variable *var = interpreter_getvar(interp, line + offsets[i]);
if (var != 0)
interp->stack[i] = copystr((char *)var->value, '\0');
else
interp->stack[i] = copysubstr(line + offsets[i], j);
}
((func_t)bits[0]->value)(interp->stack);
} else {
return -2; // invalid operation
}
return 0;
}
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