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* Replaced the SDF parser by a substantially faster Bison/Flex

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parser (roughly 80x faster).

  The absolutely latest version of Bison (1.875c) is required for
  reentrant GLR support, as well as a recent version of Flex (say,
  2.5.31).  Note that most Unix distributions ship with the
  prehistoric Flex 2.5.4, which doesn't support reentrancy.
This commit is contained in:
Eelco Dolstra 2004-01-30 15:21:42 +00:00
parent abd1878b26
commit c5baaafae6
6 changed files with 261 additions and 252 deletions
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2
src/libexpr/eval.cc
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@ -137,6 +137,8 @@ Expr evalExpr2(EvalState & state, Expr e)
/* Any encountered variables must be undeclared or primops. */
if (atMatch(m, e) >> "Var" >> s1) {
if (s1 == "null") return primNull(state);
if (s1 == "true") return ATmake("Bool(True)");
if (s1 == "false") return ATmake("Bool(False)");
return e;
}