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#include <stdio.h>
#include <limits.h>
#ifdef HAVE_CONFIG_H
#include "config.h"
#else
#define _(x) x
void exception(int, char *);
#endif
#include "exceptions.h"
#include "parser.h"
typedef unsigned char op_t;
typedef struct operator_t {
op_t op;
int pri, func;
} operator_t;
static op_t pile_operators[PILEOP_MAX];
static int pile_nestedcall[PILECALL_MAX];
static int pileop_pos = 0, pilecall_pos = 0;
static operator_t operators[] = {
{',', 0, OP_NEST},
{'+', 2, OP_PLUS},
{'-', 2, OP_MOINS},
{'*', 3, OP_MUL},
{'/', 3, OP_DIV},
{'+' + 128, 4, OP_PLUS_UNARY},
{'-' + 128, 4, OP_MOINS_UNARY},
{'(', 5, OP_FUNC_CALL},
{'(' + 128, 5, OP_LPAREN},
{'[', 5, OP_DECAL},
{'[' + 128, 5, OP_DIRECT},
{255, -1, -1}
};
static operator_t get_op(op_t op)
{
int i;
for (i = 0; operators[i].op != 255; i++) {
if (operators[i].op == op)
return operators[i];
}
return operators[i];
}
static int get_pri(op_t op)
{
return get_op(op).pri;
}
static int get_func(op_t op)
{
return get_op(op).func;
}
static op_t get_last_op(void)
{
if (pileop_pos)
return pile_operators[pileop_pos - 1];
else
return -1;
}
static op_t pop_op(void)
{
if (pileop_pos)
return pile_operators[--pileop_pos];
return -1;
}
static void push_op(op_t op)
{
if (pileop_pos != PILEOP_MAX)
pile_operators[pileop_pos++] = op;
else
exception(-1, _("Too many nested operators in expression.\n"));
}
static int pop_call(void)
{
if (pilecall_pos)
return pile_nestedcall[--pilecall_pos];
return -1;
}
static void increment_call(void) {
if (pilecall_pos) {
if (pile_nestedcall[pilecall_pos - 1] != -1)
pile_nestedcall[pilecall_pos - 1]++;
}
}
static int get_last_call(void) {
if (pilecall_pos)
return pile_nestedcall[pilecall_pos - 1];
return -1;
}
static void push_call(int call)
{
if (pilecall_pos != PILECALL_MAX)
pile_nestedcall[pilecall_pos++] = call;
else
exception(-1, _("Too many nested functions calls in expression.\n"));
}
static char *getword(char *line, char *p)
{
char o = 0, *d = line, instring = 0, gotbslash = 0;
do {
if (instring) {
o = *(p++) = *line;
if (!gotbslash) {
switch (instring) {
case 1:
if (*line == '\'') {
instring = 0;
}
break;
case 2:
if (*line == '"') {
instring = 0;
}
break;
}
if (*line == '\\') gotbslash = 1;
} else {
gotbslash = 0;
}
} else {
if (*(line) == '\'') {
o = *(p++) = *line;
instring = 1;
} else if (*(line) == '"') {
o = *(p++) = *line;
instring = 2;
} else {
if (*(line) != ' ') {
o = *(p++) = *line;
} else if (d != line) {
*p = '\0';
return line;
}
}
}
line++;
} while (((*line) && (*line != ')') && (*line != ']') && (*line != ';') && (get_func(*line) == -1)
&& (get_func(o) == -1)) || (instring));
*p = '\0';
return line;
}
void parse_line(char *line)
{
char buffer[BUFSIZ], imm[BUFSIZ];
op_t op;
int got_unary = 128, nbrargs;
while (*line) {
line = getword(line, buffer);
if (get_func(buffer[0]) != -1) {
buffer[0] += got_unary;
if (got_unary) {
}
if (get_pri(buffer[0]) == -1) {
if (got_unary) {
exception(-1, _("Invalid unary operator"));
} else {
exception(-1, _("Invalid binary operator"));
}
}
while (get_pri(get_last_op()) >= get_pri(buffer[0]) && (((get_last_op() & 127) != '(') && ((get_last_op() & 127) != '['))) {
act_pile(get_func(pop_op()));
got_unary = 0;
}
if (buffer[0] == '(') {
push_call(0);
}
if (buffer[0] == ',') {
increment_call();
} else push_op(buffer[0]);
got_unary = 128;
} else if ((buffer[0] == ';') || (buffer[0] == ')') || (buffer[0] == ']')) {
switch (buffer[0]) {
case ';':
while (pileop_pos) {
op = pop_op();
if (op == '(')
exception(-1, _("Parse error: too much left parenthesis"));
act_pile(get_func(op));
}
break;
case ')':
while (1) {
if (!pileop_pos)
exception(-1, _("Parse error: too much right parenthesis"));
op = pop_op();
if (((op & 127) == '('))
break;
if (((op & 127) == '['))
exception(-1, _("Parse error: enclosure mismatch"));
act_pile(get_func(op));
}
if (op == '(') {
nbrargs = pop_call();
sprintf(imm, "%i", nbrargs);
push_pile(imm);
act_pile(get_func(op));
}
got_unary = 0;
break;
case ']':
while (1) {
if (!pileop_pos)
exception(-1, _("Parse error: too much right parenthesis"));
op = pop_op();
if (((op & 127) == '['))
break;
if (((op & 127) == '('))
exception(-1, _("Parse error: enclosure mismatch"));
act_pile(get_func(op));
}
act_pile(get_func(op));
got_unary = 0;
break;
}
} else if (((buffer[0] >= 'A') && (buffer[0] <= 'Z')) || ((buffer[0] >= 'a') && (buffer[0] <= 'z'))
|| ((buffer[0] >= '0') && (buffer[0] <= '9')) || (buffer[0] == '_') || (buffer[0] == '"') || (buffer[0] == '\'')) {
push_pile(buffer);
got_unary = 0;
if (!get_last_call()) increment_call();
} else if (buffer[0]) {
exception(-1, _("Invalid character"));
}
}
}
#ifndef HAVE_CONFIG_H
void exception(int level, char *msg)
{
fprintf(stderr, "%s\n", msg);
exit(level);
}
void push_pile(char *word)
{
printf("%s ", word);
}
void act_pile(int func)
{
char op;
switch (func) {
case OP_PLUS:
op = '+';
break;
case OP_MOINS:
op = '-';
break;
case OP_DIV:
op = '/';
break;
case OP_MUL:
op = '*';
break;
case OP_PLUS_UNARY:
op = '\0';
break;
case OP_MOINS_UNARY:
op = '|';
break;
case OP_FUNC_CALL:
op = '@';
break;
case OP_DECAL:
op = '[';
break;
case OP_DIRECT:
op = '{';
break;
}
printf("%c ", op);
}
void main(void)
{
parse_line("ADD R18, R20, 39;");
printf("\n\n"); fflush(stdout);
parse_line("MOV R31, Bidule[48 + R12];");
printf("\n\n"); fflush(stdout);
parse_line("MOV R12, [R3];");
printf("\n\n"); fflush(stdout);
parse_line("MOV R22, Truc[(3+2)*8];");
printf("\n\n"); fflush(stdout);
parse_line("Trucmuche DB \"Test de chaîne complète avec des opérateurs comme le + et le - ...\"");
printf("\n\n"); fflush(stdout);
}
#endif
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