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* Use a symbol table to represent identifiers and attribute names

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efficiently.  The symbol table ensures that there is only one copy
  of each symbol, thus allowing symbols to be compared efficiently
  using a pointer equality test.
This commit is contained in:
Eelco Dolstra 2010-04-13 12:25:42 +00:00
parent 10e8b1fd15
commit ac1e8f40d4
15 changed files with 228 additions and 101 deletions
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6
src/libexpr/nixexpr.cc
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@ -54,7 +54,7 @@ void ExprAttrs::show(std::ostream & str)
{
if (recursive) str << "rec ";
str << "{ ";
foreach (list<string>::iterator, i, inherited)
foreach (list<Symbol>::iterator, i, inherited)
str << "inherit " << *i << "; ";
foreach (Attrs::iterator, i, attrs)
str << i->first << " = " << *i->second << "; ";
@ -81,9 +81,9 @@ void ExprLambda::show(std::ostream & str)
if (i->def) str << " ? " << *i->def;
}
str << " }";
if (arg != "") str << " @ ";
if (!arg.empty()) str << " @ ";
}
if (arg != "") str << arg;
if (!arg.empty()) str << arg;
str << ": " << *body << ")";
}