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print certain atoms in single quotes.

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This commit is contained in:
Mark Thom
2018-05-16 20:34:53 -06:00
parent 3f3fcc34c4
commit ddb79e6b34
1 changed files with 5 additions and 1 deletions
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6
src/prolog/ast.rs
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@@ -552,7 +552,11 @@ impl fmt::Display for Constant {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result { fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
match self { match self {
&Constant::Atom(ref atom) => &Constant::Atom(ref atom) =>
write!(f, "{}", atom), if atom.as_str().chars().any(|c| ".$'\" ".contains(c)) {
write!(f, "'{}'", atom.as_str())
} else {
write!(f, "{}", atom.as_str())
},
&Constant::Char(c) => &Constant::Char(c) =>
write!(f, "'{}'", c as u8), write!(f, "'{}'", c as u8),
&Constant::EmptyList => &Constant::EmptyList =>