extern int yylex() {
static bool dollar = FALSE;
bool saw_meta = FALSE;
int c;
size_t i; /* The purpose of all these local assignments is to */
const char *meta; /* allow optimizing compilers like gcc to load these */
char *buf = realbuf; /* values into registers. On a sparc this is a */
YYSTYPE *y = &yylval; /* win, in code size *and* execution time */
if (errset) {
errset = FALSE;
return '\n';
}
/* rc variable-names may contain only alnum, '*' and '_', so use dnw if we are scanning one. */
meta = (dollar ? dnw : nw);
if (newline) {
--lineno; /* slight space optimization; nextline() always increments lineno */
nextline();
newline = FALSE;
}
top: while ((c = gchar()) == ' ' || c == '\t')
w = NW;
if (c != '(') dollar = FALSE;
if (c == EOF)
return END;
if (!meta[(unsigned char) c]) { /* it's a word or keyword. */
checkfreecaret;
w = RW;
i = 0;
read: do {
buf[i++] = c;
if (c == '?' || c == '[' || c == '*')
saw_meta = TRUE;
if (i >= bufsize)
buf = realbuf = erenew_arr(char, buf, bufsize *= 2);
} while ((c = gchar()) != EOF && !meta[(unsigned char) c]);
while (c == '\\') {
if ((c = gchar()) == '\n') {
nextline();
c = ' '; /* Pretend a space was read */
break;
} else {
bs: if (meta != dnw) { /* all words but varnames may have a bslash */
buf[i++] = '\\';
if (i >= bufsize)
buf = realbuf = erenew_arr(char, buf, bufsize *= 2);
if (!meta[(unsigned char) c])
goto read;
} else {
ugchar(c);
c = '\\';
break;
}
}
static void getpair(int c) {
int n;
fd_left = fd_right = UNSET;
if (c != '[') {
ugchar(c);
return;
}
if ((unsigned int) (n = gchar() - '0') > 9) {
scanerror("expected digit after '['");
return;
}
while ((unsigned int) (c = gchar() - '0') <= 9)
n = n * 10 + c;
fd_left = n;
c += '0';
switch (c) {
default:
scanerror("expected '=' or ']' after digit");
return;
case ']':
return;
case '=':
if ((unsigned int) (n = gchar() - '0') > 9) {
if (n != ']' - '0') {
scanerror("expected digit or ']' after '='");
return;
}
fd_right = CLOSED;
} else {
while ((unsigned int) (c = gchar() - '0') <= 9)
n = n * 10 + c;
if (c != ']' - '0') {
scanerror("expected ']' after digit");
return;
}
fd_right = n;
}
}
}
extern int yylex() {
static bool dollar = FALSE;
bool saw_meta = FALSE;
int c;
SIZE_T i; /* The purpose of all these local assignments is to */
char *meta; /* allow optimizing compilers like gcc to load these */
char *buf = realbuf; /* values into registers. On a sparc this is a */
YYSTYPE *y = &yylval; /* win, in code size *and* execution time */
if (errset) {
errset = FALSE;
return '\n';
}
/* rc variable-names may contain only alnum, '*' and '_', so use dnw if we are scanning one. */
meta = (dollar ? dnw : nw);
dollar = FALSE;
if (newline) {
--lineno; /* slight space optimization; print_prompt2() always increments lineno */
print_prompt2();
newline = FALSE;
}
top: while ((c = gchar()) == ' ' || c == '\t')
w = NW;
if (c == EOF)
return END;
if (!meta[(unsigned char) c]) { /* it's a word or keyword. */
checkfreecaret;
w = RW;
i = 0;
read: do {
buf[i++] = c;
if (c == '?' || c == '[' || c == '*')
saw_meta = TRUE;
if (i >= bufsize)
buf = realbuf = erealloc(buf, bufsize *= 2);
} while ((c = gchar()) != EOF && !meta[(unsigned char) c]);
while (c == '\\') {
if ((c = gchar()) == '\n') {
print_prompt2();
c = ' '; /* Pretend a space was read */
break;
} else {
bs: if (meta != dnw) { /* all words but varnames may have a bslash */
buf[i++] = '\\';
if (i >= bufsize)
buf = realbuf = erealloc(buf, bufsize *= 2);
if (!meta[(unsigned char) c])
goto read;
} else {
ugchar(c);
c = '\\';
break;
}
}
}
ugchar(c);
buf[i] = '\0';
w = KW;
if (i == 2) {
if (*buf == 'i' && buf[1] == 'f') return IF;
if (*buf == 'f' && buf[1] == 'n') return FN;
if (*buf == 'i' && buf[1] == 'n') return IN;
}
if (streq(buf, "for")) return FOR;
if (streq(buf, "else")) return ELSE;
if (streq(buf, "switch")) return SWITCH;
if (streq(buf, "while")) return WHILE;
if (streq(buf, "case")) return CASE;
w = RW;
y->word.w = ncpy(buf);
if (saw_meta) {
char *r, *s;
y->word.m = nalloc(strlen(buf) + 1);
for (r = buf, s = y->word.m; *r != '\0'; r++, s++)
*s = (*r == '?' || *r == '[' || *r == '*');
} else {
y->word.m = NULL;
}
return WORD;
}
if (c == '`' || c == '!' || c == '@' || c == '~' || c == '$' || c == '\'') {
checkfreecaret;
if (c == '!' || c == '@' || c == '~')
w = KW;
}
switch (c) {
case '!':
return BANG;
case '@':
return SUBSHELL;
case '~':
return TWIDDLE;
case '`':
c = gchar();
if (c == '`')
return BACKBACK;
ugchar(c);
return '`';
case '$':
dollar = TRUE;
c = gchar();
if (c == '#')
return COUNT;
if (c == '^')
return FLAT;
ugchar(c);
return '$';
case '\'':
w = RW;
i = 0;
do {
buf[i++] = c;
if (c == '\n')
print_prompt2();
if (c == EOF) {
w = NW;
scanerror("eof in quoted string");
return HUH;
}
if (i >= bufsize)
buf = realbuf = erealloc(buf, bufsize *= 2);
} while ((c = gchar()) != '\'' || (c = gchar()) == '\''); /* quote "'" thus: 'how''s it going?' */
ugchar(c);
buf[i] = '\0';
y->word.w = ncpy(buf);
y->word.m = NULL;
return WORD;
case '\\':
if ((c = gchar()) == '\n') {
print_prompt2();
goto top; /* Pretend it was just another space. */
}
ugchar(c);
c = '\\';
checkfreecaret;
c = gchar();
i = 0;
goto bs;
case '(':
if (w == RW) /* SUB's happen only after real words, not keyowrds, so if () and while () work */
c = SUB;
w = NW;
return c;
case '#':
while ((c = gchar()) != '\n') /* skip comment until newline */
if (c == EOF)
return END;
/* FALLTHROUGH */
case '\n':
lineno++;
newline = TRUE;
/* FALLTHROUGH */
case ';':
case '^':
case ')':
case '=':
case '{': case '}':
w = NW;
return c;
case '&':
w = NW;
c = gchar();
if (c == '&')
return ANDAND;
ugchar(c);
return '&';
case '|':
w = NW;
c = gchar();
if (c == '|')
return OROR;
getpair(c);
if (errset)
return HUH;
if ((y->pipe.left = fd_left) == UNSET)
y->pipe.left = 1; /* default to fd 1 */
if ((y->pipe.right = fd_right) == UNSET)
y->pipe.right = 0; /* default to fd 0 */
if (y->pipe.right == CLOSED) {
scanerror("expected digit after '='"); /* can't close a pipe */
return HUH;
}
return PIPE;
case '>':
c = gchar();
if (c == '>') {
c = gchar();
y->redir.type = rAppend;
} else
y->redir.type = rCreate;
y->redir.fd = 1;
goto common;
case '<':
c = gchar();
if (c == '<') {
c = gchar();
if (c == '<') {
c = gchar();
y->redir.type = rHerestring;
} else {
y->redir.type = rHeredoc;
}
} else
y->redir.type = rFrom;
y->redir.fd = 0;
common:
w = NW;
getpair(c);
if (errset)
return HUH;
if (fd_right == UNSET) { /* redirection, not dup */
if (fd_left != UNSET) {
y->redir.fd = fd_left;
return SREDIR;
}
return (y->redir.type == rFrom || y->redir.type == rCreate) ? REDIR : SREDIR;
} else { /* dup; recast yylval */
y->dup.type = y->redir.type;
y->dup.left = fd_left;
y->dup.right = fd_right;
return DUP;
}
default:
w = NW;
return c; /* don't know what it is, let yacc barf on it */
}
}
/* Read an S-expression */
long
l_read(void)
{
long s, v, t;
char token[32];
char ch, i;
/* skip spaces */
if ((ch = skip_space()) < 0){ /* eof */
return TAG_EOF;
} else if (ch == ';'){ /* comment */
while (gchar() != '\n')
;
return -1;
}
#ifdef ZX81
else if (ch == '\"'){ /* quote macro */
#else
else if (ch == '\''){ /* quote macro */
#endif
if ((t = l_read()) < 0)
return -1;
if (t == TAG_EOF)
return err_msg(errmsg_eof, 0, 0);
t = l_cons(t, TAG_NIL);
s = l_cons((TAG_SYMB|KW_QUOTE), t);
} else if (ch != '('){ /* t, nil, symbol, or integer */
token[0] = ch;
for (i = 1; ; i++){
ch = gchar();
if (isspace(ch) || iscntrl(ch) || (ch < 0)
|| (ch == ';') || (ch == '(') || (ch == ')')){
ugchar(ch);
token[i] = '\0';
/* Changed to permint the definition of "1+" and "1-" */
if ((isdigit((char)token[0]) && (token[1] != '+') && (token[1] != '-'))
/* if (isdigit((char)token[0]) */
|| ((token[0] == '-') && isdigit((char)token[1]))
|| ((token[0] == '+') && isdigit((char)token[1]))){ /* integer */
s = int_make_l(atol(token));
#ifdef SCHEME
} else if (strcmp(token, "#f") == 0){ /* nil */
s = TAG_NIL;
} else if (strcmp(token, "#t") == 0){ /* t */
s = TAG_T;
#else
} else if (strcmp(token, "nil") == 0){ /* nil */
s = TAG_NIL;
} else if (strcmp(token, "t") == 0){ /* t */
s = TAG_T;
#endif
} else { /* symbol */
s = TAG_SYMB | symb_make(token);
}
break;
}
token[i] = ch;
}
} else /* ch == '(' */ { /* list */
if ((ch = skip_space()) < 0){
return err_msg(errmsg_eof, 0, 0);
} else if (ch == ')'){
s = TAG_NIL; /* "()" = nil */
} else {
ugchar(ch);
if ((t = l_read()) < 0)
return err_msg(errmsg_eof, 0, 0);
if (t == TAG_EOF)
return -1;
if ((s = v = l_cons(t, TAG_NIL)) < 0)
return -1;
if (gc_protect(s) < 0)
return -1;
for (;;){
if ((ch = skip_space()) < 0) /* look ahead next char */
return err_msg(errmsg_eof, 0, 0);
if (ch == ')')
break;
ugchar(ch);
if ((t = l_read()) < 0)
return -1;
if (t == TAG_EOF)
return err_msg(errmsg_eof, 0, 0);
if ((t = l_cons(t, TAG_NIL)) < 0)
return -1;
rplacd(v, t);
v = l_cdr(v);
}
gc_unprotect(s);
}
}
return s;
}
char
skip_space(void)
{
char ch;
for (;;){
if ((ch = gchar()) < 0)
return -1; /* end-of-file */
if (!isspace(ch) && !iscntrl(ch))
break;
}
return ch;
}
