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* Simplify @-patterns: only {attrs}@name' or name@{attrs}' are now

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allowed.  So `name1@name2', `{attrs1}@{attrs2}' and so on are now no
  longer legal.  This is no big loss because they were not useful
  anyway.

  This also changes the output of builtins.toXML for @-patterns
  slightly.
This commit is contained in:
Eelco Dolstra 2010-03-25 12:19:41 +00:00
parent 7482349fe8
commit 8a10360c91
13 changed files with 83 additions and 173 deletions
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8
src/libexpr/nixexpr.cc
View file

@ -114,23 +114,19 @@ static void varsBoundByPattern(ATermMap & map, Pattern pat)
{
ATerm name;
ATermList formals;
Pattern pat1, pat2;
ATermBool ellipsis;
/* Use makeRemoved() so that it can be used directly in
substitute(). */
if (matchVarPat(pat, name))
map.set(name, makeRemoved());
else if (matchAttrsPat(pat, formals, ellipsis)) {
else if (matchAttrsPat(pat, formals, ellipsis, name)) {
if (name != sNoAlias) map.set(name, makeRemoved());
for (ATermIterator i(formals); i; ++i) {
ATerm d1;
if (!matchFormal(*i, name, d1)) abort();
map.set(name, makeRemoved());
}
}
else if (matchAtPat(pat, pat1, pat2)) {
varsBoundByPattern(map, pat1);
varsBoundByPattern(map, pat2);
}
else abort();
}