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static int
SCAN_FUNC_NAME (lisp_stream_t *stream)
{
static char *delims = "\"();";
SCAN_DECLS
int c;
do
{
c = NEXT_CHAR;
if (c == EOF)
RETURN(TOKEN_EOF);
else if (c == ';') /* comment start */
while (1)
{
c = NEXT_CHAR;
if (c == EOF)
RETURN(TOKEN_EOF);
else if (c == '\n')
break;
}
} while (isspace(c));
switch (c)
{
case '(' :
RETURN(TOKEN_OPEN_PAREN);
case ')' :
RETURN(TOKEN_CLOSE_PAREN);
case '"' :
_token_clear();
while (1)
{
c = NEXT_CHAR;
if (c == EOF)
RETURN(TOKEN_ERROR);
if (c == '"')
break;
if (c == '\\')
{
c = NEXT_CHAR;
switch (c)
{
case EOF :
RETURN(TOKEN_ERROR);
case 'n' :
c = '\n';
break;
case 't' :
c = '\t';
break;
}
}
_token_append(c);
}
RETURN(TOKEN_STRING);
case '#' :
c = NEXT_CHAR;
if (c == EOF)
RETURN(TOKEN_ERROR);
switch (c)
{
case 't' :
RETURN(TOKEN_TRUE);
case 'f' :
RETURN(TOKEN_FALSE);
case '?' :
c = NEXT_CHAR;
if (c == EOF)
RETURN(TOKEN_ERROR);
if (c == '(')
RETURN(TOKEN_PATTERN_OPEN_PAREN);
else
RETURN(TOKEN_ERROR);
}
RETURN(TOKEN_ERROR);
default :
if (isdigit(c) || c == '-')
{
int have_nondigits = 0;
int have_digits = 0;
int have_floating_point = 0;
TOKEN_START(1);
do
{
if (isdigit(c))
have_digits = 1;
else if (c == '.')
have_floating_point++;
TOKEN_APPEND(c);
c = NEXT_CHAR;
if (c != EOF && !isdigit(c) && !isspace(c) && c != '.' && !strchr(delims, c))
have_nondigits = 1;
} while (c != EOF && !isspace(c) && !strchr(delims, c));
if (c != EOF)
UNGET_CHAR(c);
TOKEN_STOP;
if (have_nondigits || !have_digits || have_floating_point > 1)
RETURN(TOKEN_SYMBOL);
else if (have_floating_point == 1)
RETURN(TOKEN_REAL);
else
RETURN(TOKEN_INTEGER);
}
else
{
if (c == '.')
{
c = NEXT_CHAR;
if (c != EOF && !isspace(c) && !strchr(delims, c))
{
TOKEN_START(2);
TOKEN_APPEND('.');
}
else
{
UNGET_CHAR(c);
RETURN(TOKEN_DOT);
}
}
else
{
TOKEN_START(1);
}
do
{
TOKEN_APPEND(c);
c = NEXT_CHAR;
} while (c != EOF && !isspace(c) && !strchr(delims, c));
if (c != EOF)
UNGET_CHAR(c);
TOKEN_STOP;
RETURN(TOKEN_SYMBOL);
}
}
assert(0);
RETURN(TOKEN_ERROR);
}
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