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Formerly expand.c.~8~

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This commit is contained in:
Roland McGrath 1993-05-06 21:14:33 +00:00
parent f1daf67200
commit 29de1a7e5a
1 changed files with 87 additions and 44 deletions
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131
expand.c
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@ -103,6 +103,30 @@ recursively_expand (v)
return value;
}
/* Expand a simple reference to variable NAME, which LENGTH chars long. */
#ifdef __GNUC__
__inline
#endif
static char *
reference_variable (o, name, length)
char *o;
char *name;
unsigned int length;
{
register struct variable *v = lookup_variable (name, length);
if (v != 0 && *v->value != '\0')
{
char *value = (v->recursive ? recursively_expand (v) : v->value);
o = variable_buffer_output (o, value, strlen (value));
if (v->recursive)
free (value);
}
return o;
}
/* Scan LINE for variable references and expansion-function calls.
Build in `variable_buffer' the result of expanding the references and calls.
@ -151,6 +175,7 @@ variable_expand (line)
register char *beg = p + 1;
char *op, *begp;
char *end;
char *colon = 0;
op = o;
begp = p;
@ -167,7 +192,7 @@ variable_expand (line)
p1 = index (beg, closeparen);
if (p1 != 0)
p1 = lindex (beg, p1, '$');
if (p1 != 0)
if (p1 != 0 && lindex (beg, p1, ':') == 0)
{
/* BEG now points past the opening paren or brace.
Count parens or braces until it is matched. */
@ -178,22 +203,41 @@ variable_expand (line)
++count;
else if (*p == closeparen && --count < 0)
break;
else if (colon == 0 && count == 0 && *p == ':')
/* Record where we found a colon, which
indicates a substitution reference.
We want to expand the text before the
reference only. */
colon = p;
}
/* If COUNT is >= 0, there were unmatched opening parens
or braces, so we go to the simple case of a variable name
such as `$($(a)'. */
if (count < 0)
{
char *name = expand_argument (beg, p);
static char start[3] = { '$', }, end[2];
start[1] = openparen;
end[0] = closeparen;
p1 = concat (start, name, end);
free (name);
name = allocated_variable_expand (p1);
o = variable_buffer_output (o, name, strlen (name));
free (name);
break;
char *name = expand_argument (beg, colon == 0 ? p : colon);
unsigned int namelen = strlen (name);
if (colon == 0)
{
/* This is a simple reference to the expanded name. */
o = reference_variable (o, name, namelen);
free (name);
break;
}
else
{
/* This is a substitution reference to the expanded
name. We replace the pending text with a copy
containing the expanded name in place of the
original name, and then fall through to
the normal substitution reference code below. */
unsigned int restlen = strlen (colon) + 1;
beg = (char *) alloca (namelen + restlen);
bcopy (name, beg, namelen);
bcopy (colon, &beg[namelen], restlen);
/* Point COLON into the new copy. */
colon = &beg[namelen];
}
}
}
@ -201,17 +245,17 @@ variable_expand (line)
it does not contain any variable references inside.
There are several things it could be. */
p = index (beg, ':');
if (p != 0 && lindex (beg, p, closeparen) == 0)
if (colon == 0)
colon = index (beg, ':');
if (colon != 0 && lindex (beg, colon, closeparen) == 0)
{
/* This is a substitution reference: $(FOO:A=B). */
int count;
char *subst_beg, *replace_beg;
unsigned int subst_len, replace_len;
char *subst_beg, *subst_end, *replace_beg, *replace_end;
v = lookup_variable (beg, p - beg);
v = lookup_variable (beg, colon - beg);
subst_beg = p + 1;
subst_beg = colon + 1;
count = 0;
for (p = subst_beg; *p != '\0'; ++p)
{
@ -225,7 +269,7 @@ variable_expand (line)
if (count > 0)
/* There were unmatched opening parens. */
return initialize_variable_output ();
subst_len = p - subst_beg;
subst_end = p;
replace_beg = p + 1;
count = 0;
@ -240,27 +284,29 @@ variable_expand (line)
/* There were unmatched opening parens. */
return initialize_variable_output ();
end = p;
replace_len = p - replace_beg;
replace_end = p;
p = expand_argument (subst_beg, subst_end);
p1 = expand_argument (replace_beg, replace_end);
if (v != 0 && *v->value != '\0')
{
char *value = (v->recursive ? recursively_expand (v)
: v->value);
if (lindex (subst_beg, subst_beg + subst_len, '%') != 0)
{
p = savestring (subst_beg, subst_len);
p1 = savestring (replace_beg, replace_len);
o = patsubst_expand (o, value, p, p1,
(char *) 0, (char *) 0);
free (p);
free (p1);
}
char *percent = find_percent (p);
if (percent != 0)
o = patsubst_expand (o, value, p, p1,
percent, (char *) 0);
else
o = subst_expand (o, value, subst_beg, replace_beg,
subst_len, replace_len, 0, 1);
o = subst_expand (o, value,
p, p1, strlen (p), strlen (p1),
0, 1);
if (v->recursive)
free (value);
}
free (p);
free (p1);
}
/* No, this must be an ordinary variable reference. */
@ -270,16 +316,7 @@ variable_expand (line)
end = index (beg, closeparen);
if (end == 0)
return initialize_variable_output ();
v = lookup_variable (beg, end - beg);
if (v != 0 && *v->value != '\0')
{
char *value = (v->recursive ? recursively_expand (v)
: v->value);
o = variable_buffer_output (o, value, strlen (value));
if (v->recursive)
free (value);
}
o = reference_variable (o, beg, end - beg);
}
/* Advance p past the variable reference to resume scan. */
@ -333,12 +370,18 @@ char *
expand_argument (str, end)
char *str, *end;
{
char *tmp = savestring (str, end - str);
char *value = allocated_variable_expand (tmp);
char *tmp;
free (tmp);
if (*end == '\0')
tmp = str;
else
{
tmp = (char *) alloca (end - str + 1);
bcopy (str, tmp, end - str);
tmp[end - str] = '\0';
}
return value;
return allocated_variable_expand (tmp);
}
/* Expand LINE for FILE. Error messages refer to the file and line where