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Grammar: Corrected left-recursion check

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This commit is contained in:
Paul Beckingham 2015-12-25 22:49:37 -05:00
parent a164a72156
commit 9b599597f1
1 changed files with 3 additions and 2 deletions
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5
src/Grammar.cpp
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@ -221,7 +221,8 @@ void Grammar::validate () const
allTokens.push_back (token._token);
if (token._token == production[0]._token &&
rule.first == production[0]._token)
rule.first == production[0]._token &&
production.size () == 1)
allLeftRecursive.push_back (token._token);
}
}
@ -238,7 +239,7 @@ void Grammar::validate () const
throw format ("Definition '{1}' referenced, but not defined.", nd);
// Circular definitions - these are names in _rules that also appear as
// token 0 in any of the alternates for that definition.
// the only token in any of the alternates for that definition.
for (auto& lr : allLeftRecursive)
throw format ("Definition '{1}' is left recursive.", lr);