// check if line is rule in right shape...
bool
LSystem::isItRule( string *line, char *c, short *prob, string *right)
{
// rule has to look like:
// <left side>(<probability(int from 1 to 100)>)=<rightside>
unsigned short pos= 0;
int val = 0;
char ch;
// check left side
ch= ( *line)[ pos++];
if( ! isAlph( ch))
return false;
else
*c = ch;
// check probability
if( ( *line)[ pos++] != '(')
return false;
ch= ( *line)[ pos];
while( isDig( ch))
{
val = val * 10 + ( ch - '0');
pos++;
ch= ( *line)[ pos];
}
// check if next char is ')'
if( ch != ')')
return false;
// assign loaded value to prob
*prob = val;
// skip from '(' to '='
pos++;
if( ( *line)[ pos++] != '=')
return false;
// the rest of line is right side of rule
// i don't check any error in it cos i don't know
// what is an error. So copy it to right
right->clear( );
while( pos < line->size( ))
{
*right += ( *line)[ pos];
pos++;
}
return true;
}
int LSystem::toInt( string s)
{
int value= 0;
int pos= 0;
char c= s[ pos];
while( isDig( c))
{
value = value * 10 + ( c - '0');
pos++;
c= s[ pos];
}
return value;
}
bool isFloat(char *&c)
{
int state = -1;
if (isDig(*c))
state = 0;
else if (*c == '-')
state = 10;
else
return false;
c++;
while (true)
{
switch (state)
{
case 10:
if (isDig(*c))
{
c++;
state = 0;
}
else
state = -1;
break;
/* 0 */ case 0:
if (isDig(*c))
c++;
else if (*c == '.')
{
state = 1;
c++;
} else if (*c == 'e')
{
state = 3;
c++;
} else if (*c == 0)
return true;
else
return true;
break;
/* 1 */ case 1:
if (*c == 0)
state = -1;
else if (isDig(*c))
{
state = 2;
c++;
} else
state = -1;
break;
/* 2 */ case 2:
if (*c == 0)
return true;
else if (isDig(*c))
c++;
else if (*c == 'e')
{
state = 3;
c++;
} else
return true;
break;
/* 3 */ case 3:
if (*c == 0)
state = -1;
else if (*c == '+' || *c == '-')
{
state = 4;
c++;
} else if (isDig(*c))
{
state = 5;
c++;
} else
state = -1;
break;
/* 4 */ case 4:
if (*c == 0)
state = -1;
else if (isDig(*c))
{
state = 5;
c++;
} else
state = -1;
break;
/* 5 */ case 5:
if (*c == 0)
return true;
else if (isDig(*c))
c++;
else
return true;
break;
/* -1 */ case -1:
return false;
}
}
}