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tokenback ()
Wegen der Maskierung. Kommt eine, muss 2 zurück
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#define X 1024
#define END -1
#define IF_BEGIN 0
#define IF_ELSE 1
#define IF_END 2
#define REPEAT_BEGIN 3
#define ROUND_BRACKET_OPEN 4
#define ROUND_BRACKET_CLOSE 5
#define STACKLASTWASLABEL 0
#define STACKXREALLOOPLABEL 1
#define STACKXREALIFBEGIN 2
#define STACKXREALELSEBEGIN 3
#define REALEND -1
#define CONTROLSTATE 31
#define ASCIIMIN 32
#define ASCIIMAX 255
#define LEX_ROUND_BRACKET_OPEN 1
#define LEX_ROUND_BRACKET_CLOSE 2
#define LEX_SQUARE_BRACKET_OPEN 3
#define LEX_SQUARE_BRACKET_CLOSE 4
#define LEX_COMMA 5
#define LEX_STAR 6
#define LEX_DOT 7
#define LEX_END 0
#define LEX_EMPTY 8
char statechar [X];
int x;
int initstates () {
int l;
for (l = 0; l < X; l++) {
statechar [l] = LEX_EMPTY;
}
}
int jx = 0;
char text [] = "ab cdpkcdpkpkpkcdpkfhpkpkfhpkpkpkfhpkpkpkcdpkpkpkcdpkef*gh";
//char expr [] = "abc*de[fasd,asddsr]qdsda*ghijk";
//char expr [] = "[*([[[([a,[[[p,q*],ca],[d,*(ead)]]]f*(mmm(nnn)mm)),a],asd],semdu]),*poller]";
//char expr [] = "[*([[[([a,[[[p,*(q)],ca],[d,*(ead)]]]f*(mmm(nnn)mm)),a],asd],semdu]),*poller]";
//char expr [] = "*(mmm(nnn)mm)";
//char expr [] = "a(b*(*(cd)aaa)(efg))";
char expr [] = "*ab *([cd,fh]*(pk))ef\*gh";
//char expr [] = "abcd";
int i = 0;
char gettoken () {
if ((expr [i] == 0))
return LEX_END;
else if (expr [i] == '(') {
i++;
return LEX_ROUND_BRACKET_OPEN;
}
else if (expr [i] == ')') {
i++;
return LEX_ROUND_BRACKET_CLOSE;
}
else if (expr [i] == '[') {
i++;
return LEX_SQUARE_BRACKET_OPEN;
}
else if (expr [i] == ']') {
i++;
return LEX_SQUARE_BRACKET_CLOSE;
}
else if (expr [i] == '*') {
i++;
return LEX_STAR;
}
else if (expr [i] == ',') {
i++;
return LEX_COMMA;
}
else if (expr [i] == '\') {
i++;
return expr [i++];
}
else if ((expr [i] >= ASCIIMIN) \&\& (expr [i] <= ASCIIMAX)) {
return expr [i++];
}
}
void tokenback () {
if (expr [i-2] == '\')
i = i-2;
else
i--;
}
/*
aaaa
aaaaaa
aaaaaaa
aaaaaaaa()
*/
int stream ();
int followed ();
int compound ();
int or_operator ();
int repeat_operator ();
int or_operator () {
int ch;
if ((ch = gettoken ()) == LEX_SQUARE_BRACKET_OPEN) {
statechar [x] = IF_BEGIN;
x++;
or_operator ();
if (gettoken () != LEX_COMMA) {
fprintf (stderr, "Komma vergessen");
exit (1);
}
statechar [x] = IF_ELSE;
x++;
or_operator ();
if ((ch = gettoken ()) != LEX_SQUARE_BRACKET_CLOSE) {
fprintf (stderr, "Klammer vergessen ]");
exit (1);
}
statechar [x] = IF_END;
x++;
repeat_operator ();
}
else if (ch == LEX_END)
return 0;
else {
tokenback ();
repeat_operator ();
}
}
int repeat_operator () {
int ch;
if ((ch = gettoken ()) == LEX_STAR) {
statechar [x] = REPEAT_BEGIN;
x++;
stream ();
}
else if (ch == LEX_END)
return 0;
else {
tokenback ();
stream ();
}
}
int stream () {
int r = 0;
r = compound ();
r |= followed ();
if (r) {
or_operator();
}
}
int followed () {
int ch = gettoken ();
int st, xtmp;
if ((ch >= ASCIIMIN) \&\& (ch <= ASCIIMAX)) {
statechar [x] = ch;
x = x+1;
or_operator ();
return 1;
}
else if (ch == LEX_END)
return 0;
else {
tokenback ();
return 0;
}
}
int compound () {
int ch;
if ((ch = gettoken ()) == LEX_ROUND_BRACKET_OPEN) {
statechar [x] = ROUND_BRACKET_OPEN;
x++;
or_operator ();
if ((ch = gettoken ()) != LEX_ROUND_BRACKET_CLOSE) {
fprintf (stderr, "fehler klammer vergessen %c %in", expr [i], i);
exit (1);
}
statechar [x] = ROUND_BRACKET_CLOSE;
x++;
return 1;
}
else if (ch == LEX_END)
return 0;
else {
tokenback ();
return 0;
}
}
int realstates1 [1024];
int realstates2 [1024];
int realstateschar [1024];
int stacks [32][1024];
int stacksp [32];
void push (int stackid, int state) {
stacks [stackid][stacksp[stackid]++] = state;
}
int pop (int stackid) {
stacksp [stackid]--;
return stacks [stackid][stacksp[stackid]];
}
int emptystack (int stackid) {
return (stacksp[stackid] == 0);
}
void automatgen ( ) {
int xi = 0;
int xreal = 0;
int itwas = 0;
int tmp;
for (xi = 0; xi <= x; ) {
if ((statechar [xi] >= ASCIIMIN) \&\& (statechar [xi] <= ASCIIMAX)) {
realstates1 [xreal] = xreal+1;
realstates2 [xreal] = xreal+1;
realstateschar [xreal] = statechar [xi];
xreal++;
}
else if (statechar [xi] == ROUND_BRACKET_OPEN) {
push (STACKLASTWASLABEL, ROUND_BRACKET_OPEN);
}
else if (statechar [xi] == REPEAT_BEGIN) {
xi++;
if (statechar [xi] == ROUND_BRACKET_OPEN) {
push (STACKXREALLOOPLABEL, xreal);
push (STACKLASTWASLABEL, REPEAT_BEGIN);
}
else if ((statechar [xi] >= ASCIIMIN) \&\& (statechar [xi] <= ASCIIMAX)) {
realstates1 [xreal] = xreal+1;
realstates2 [xreal] = xreal+1;
realstateschar [xreal] = statechar [xi];
xreal++;
realstates1 [xreal] = xreal+1;
realstates2 [xreal] = xreal-1;
realstateschar [xreal] = CONTROLSTATE;
xreal++;
}
}
else if (statechar [xi] == ROUND_BRACKET_CLOSE) {
if ((itwas = pop (STACKLASTWASLABEL)) == REPEAT_BEGIN) {
realstateschar [xreal] = CONTROLSTATE;
realstates1 [xreal] = pop (STACKXREALLOOPLABEL);
realstates2 [xreal] = xreal+1;
xreal++;
}
else if (itwas = ROUND_BRACKET_OPEN);
}
else if (statechar [xi] == IF_BEGIN) {
realstateschar [xreal] = CONTROLSTATE;
realstates1 [xreal] = xreal+1;
push (STACKXREALIFBEGIN, xreal);
xreal++;
}
else if (statechar [xi] == IF_ELSE) {
realstates2 [pop (STACKXREALIFBEGIN)] = xreal;
push (STACKXREALELSEBEGIN, xreal-1);
}
else if (statechar [xi] == IF_END) {
realstates2 [tmp = pop (STACKXREALELSEBEGIN)] = xreal;
realstates1 [tmp] = xreal;
}
xi++;
}
realstateschar [xreal] = REALEND;
realstates1 [xreal] = REALEND;
realstates2 [xreal] = REALEND;
int k;
for (k = 0; k <= xreal; k++) {
printf ("(%i, ", realstateschar [k]);
printf ("%i, ", realstates1 [k]);
printf ("%i)n", realstates2 [k]);
}
}
int xtext = 0;
int automat (int xreal) {
int xtext2;
int flag = 0;
for (; (realstates1 [xreal] != REALEND) \&\& (realstates2 [xreal] != REALEND) \&\& (xtext < strlen(text)); xreal = realstates1 [xreal], xtext++) {
if (realstateschar [xreal] == text [xtext])
printf ("succeded: %c %sn", text [xtext], text + xtext);
else if ((realstateschar [xreal] == CONTROLSTATE) \&\& (realstates1 [xreal] != realstates2 [xreal])) {
xtext2 = xtext;
flag = (automat (realstates1 [xreal]) == 1);
xtext = xtext2;
flag |= (automat (realstates2 [xreal]) == 1);
if (flag == 0) return -1;
else return 1;
}
else if (realstates1 [xreal] == REALEND ) return 1;
else {printf ("%cn", realstateschar [xreal]); return -1;}
}
if (realstates1 [xreal] == REALEND) {
return 1;
}
else {
return -1;
}
}
int main (void) {
int k, l;
initstates ();
or_operator (0);
for (l = 0; l <= x; l++) {
if (statechar [l] == ROUND_BRACKET_OPEN)
printf ("(ROUND_BRACKET_OPEN, %2i)n", l);
else if (statechar [l] == ROUND_BRACKET_CLOSE)
printf ("(ROUND_BRACKET_CLOSE, %2i)n", l);
else if (statechar [l] == REPEAT_BEGIN)
printf ("(REPEAT_BEGIN, %2i)n", l);
else
printf ("(%2c %2i)n", statechar [l], l);
}
automatgen ();
printf ("%in", automat (0));
}
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