uint32_t
expr(char *addr)
{
uint32_t t, t2;
char op;
if(*addr == '\0')
return dot;
addr = numsym(addr, &t);
if(*addr == '\0')
return t;
addr = nextc(addr);
op = *addr++;
numsym(addr, &t2);
switch(op) {
default:
Bprint(bioout, "expr syntax\n");
return 0;
case '+':
t += t2;
break;
case '-':
t -= t2;
break;
case '%':
t /= t2;
break;
case '&':
t &= t2;
break;
case '|':
t |= t2;
break;
}
return t;
}
int
yylex(void)
{
int c;
extern char vfmt[];
loop:
Bflush(bout);
c = lexc();
switch(c) {
case Eof:
if(gotint) {
gotint = 0;
stacked = 0;
Bprint(bout, "\nacid: ");
goto loop;
}
return Eof;
case '"':
eatstring();
return Tstring;
case ' ':
case '\r':
case '\t':
goto loop;
case '\n':
line++;
if(interactive == 0)
goto loop;
if(stacked) {
print("\t");
goto loop;
}
return ';';
case '.':
c = lexc();
unlexc(c);
if(isdigit(c))
return numsym('.');
return '.';
case '(':
case ')':
case '[':
case ']':
case ';':
case ':':
case ',':
case '~':
case '?':
case '*':
case '@':
case '^':
case '%':
return c;
case '{':
stacked++;
return c;
case '}':
stacked--;
return c;
case '\\':
c = lexc();
if(strchr(vfmt, c) == 0) {
unlexc(c);
return '\\';
}
yylval.ival = c;
return Tfmt;
case '!':
c = lexc();
if(c == '=')
return Tneq;
unlexc(c);
return '!';
case '+':
c = lexc();
if(c == '+')
return Tinc;
unlexc(c);
return '+';
case '/':
c = lexc();
if(c == '/') {
eatnl();
goto loop;
}
unlexc(c);
return '/';
case '\'':
c = lexc();
if(c == '\\')
yylval.ival = escchar(lexc());
else
yylval.ival = c;
c = lexc();
if(c != '\'') {
error("missing '");
unlexc(c);
}
return Tconst;
case '&':
c = lexc();
if(c == '&')
return Tandand;
unlexc(c);
return '&';
case '=':
c = lexc();
if(c == '=')
return Teq;
unlexc(c);
return '=';
case '|':
c = lexc();
if(c == '|')
return Toror;
unlexc(c);
return '|';
case '<':
c = lexc();
if(c == '=')
return Tleq;
if(c == '<')
return Tlsh;
unlexc(c);
return '<';
case '>':
c = lexc();
if(c == '=')
return Tgeq;
if(c == '>')
return Trsh;
unlexc(c);
return '>';
case '-':
c = lexc();
if(c == '>')
return Tindir;
if(c == '-')
return Tdec;
unlexc(c);
return '-';
default:
return numsym(c);
}
}
int
yylex(void)
{
int c;
loop:
c = Bgetc(bin);
switch(c) {
case Eof:
return Eof;
case '"':
eatstring();
return TSTRING;
case ' ':
case '\t':
case '\r':
goto loop;
case '\n':
line++;
goto loop;
case '.':
c = Bgetc(bin);
Bungetc(bin);
if(isdigit(c))
return numsym('.');
return '.';
case '#':
eatnl();
goto loop;
case '(':
case ')':
case ';':
case ',':
case '~':
case '$':
case '+':
case '/':
case '%':
case '^':
case '*':
case '&':
case '=':
case '|':
case '<':
case '>':
case '-':
case ':':
return c;
case '\'':
c = Bgetrune(bin);
if(c == '\\')
yylval.ival = escchar(Bgetc(bin));
else
yylval.ival = c;
c = Bgetc(bin);
if(c != '\'') {
diag("missing '");
Bungetc(bin);
}
return TCONST;
default:
return numsym(c);
}
}
