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Remove unnecessary parentheses

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The unary modulus operation does not require extra parentheses to be
printed in cases like “|X + Y|”. This adds a new option to the printing
routine to omit parentheses in cases where the parent expression already
defines a parenthesis-like scope (currently only with unary operations).
This commit is contained in:
Patrick Lühne 2018-04-12 00:54:27 +02:00
parent 8c250f5c59
commit 04094eee23
Signed by: patrick
GPG Key ID: 05F3611E97A70ABF
2 changed files with 82 additions and 65 deletions
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145
include/anthem/output/AST.h
View File

@ -41,38 +41,39 @@ struct PrintContext
//////////////////////////////////////////////////////////////////////////////////////////////////// ////////////////////////////////////////////////////////////////////////////////////////////////////
output::ColorStream &print(output::ColorStream &stream, const BinaryOperation::Operator operator_, PrintContext &printContext); output::ColorStream &print(output::ColorStream &stream, const BinaryOperation::Operator operator_, PrintContext &printContext, bool omitParentheses = false);
output::ColorStream &print(output::ColorStream &stream, const BinaryOperation &binaryOperation, PrintContext &printContext); output::ColorStream &print(output::ColorStream &stream, const BinaryOperation &binaryOperation, PrintContext &printContext, bool omitParentheses = false);
output::ColorStream &print(output::ColorStream &stream, const Boolean &boolean, PrintContext &printContext); output::ColorStream &print(output::ColorStream &stream, const Boolean &boolean, PrintContext &printContext, bool omitParentheses = false);
output::ColorStream &print(output::ColorStream &stream, const Comparison &comparison, PrintContext &printContext); output::ColorStream &print(output::ColorStream &stream, const Comparison &comparison, PrintContext &printContext, bool omitParentheses = false);
output::ColorStream &print(output::ColorStream &stream, const Constant &constant, PrintContext &printContext); output::ColorStream &print(output::ColorStream &stream, Comparison::Operator operator_, PrintContext &printContext, bool omitParentheses = false);
output::ColorStream &print(output::ColorStream &stream, const Function &function, PrintContext &printContext); output::ColorStream &print(output::ColorStream &stream, const Constant &constant, PrintContext &printContext, bool omitParentheses = false);
output::ColorStream &print(output::ColorStream &stream, const In &in, PrintContext &printContext); output::ColorStream &print(output::ColorStream &stream, const Function &function, PrintContext &printContext, bool omitParentheses = false);
output::ColorStream &print(output::ColorStream &stream, const Integer &integer, PrintContext &printContext); output::ColorStream &print(output::ColorStream &stream, const In &in, PrintContext &printContext, bool omitParentheses = false);
output::ColorStream &print(output::ColorStream &stream, const Interval &interval, PrintContext &printContext); output::ColorStream &print(output::ColorStream &stream, const Integer &integer, PrintContext &printContext, bool omitParentheses = false);
output::ColorStream &print(output::ColorStream &stream, const Predicate &predicate, PrintContext &printContext); output::ColorStream &print(output::ColorStream &stream, const Interval &interval, PrintContext &printContext, bool omitParentheses = false);
output::ColorStream &print(output::ColorStream &stream, const SpecialInteger &specialInteger, PrintContext &printContext); output::ColorStream &print(output::ColorStream &stream, const Predicate &predicate, PrintContext &printContext, bool omitParentheses = false);
output::ColorStream &print(output::ColorStream &stream, const String &string, PrintContext &printContext); output::ColorStream &print(output::ColorStream &stream, const SpecialInteger &specialInteger, PrintContext &printContext, bool omitParentheses = false);
output::ColorStream &print(output::ColorStream &stream, const UnaryOperation &unaryOperation, PrintContext &printContext); output::ColorStream &print(output::ColorStream &stream, const String &string, PrintContext &printContext, bool omitParentheses = false);
output::ColorStream &print(output::ColorStream &stream, const Variable &variable, PrintContext &printContext); output::ColorStream &print(output::ColorStream &stream, const UnaryOperation &unaryOperation, PrintContext &printContext, bool omitParentheses = false);
output::ColorStream &print(output::ColorStream &stream, const VariableDeclaration &variableDeclaration, PrintContext &printContext); output::ColorStream &print(output::ColorStream &stream, const Variable &variable, PrintContext &printContext, bool omitParentheses = false);
output::ColorStream &print(output::ColorStream &stream, const VariableDeclaration &variableDeclaration, PrintContext &printContext, bool omitParentheses = false);
output::ColorStream &print(output::ColorStream &stream, const And &and_, PrintContext &printContext); output::ColorStream &print(output::ColorStream &stream, const And &and_, PrintContext &printContext, bool omitParentheses = false);
output::ColorStream &print(output::ColorStream &stream, const Biconditional &biconditional, PrintContext &printContext); output::ColorStream &print(output::ColorStream &stream, const Biconditional &biconditional, PrintContext &printContext, bool omitParentheses = false);
output::ColorStream &print(output::ColorStream &stream, const Exists &exists, PrintContext &printContext); output::ColorStream &print(output::ColorStream &stream, const Exists &exists, PrintContext &printContext, bool omitParentheses = false);
output::ColorStream &print(output::ColorStream &stream, const ForAll &forAll, PrintContext &printContext); output::ColorStream &print(output::ColorStream &stream, const ForAll &forAll, PrintContext &printContext, bool omitParentheses = false);
output::ColorStream &print(output::ColorStream &stream, const Implies &implies, PrintContext &printContext); output::ColorStream &print(output::ColorStream &stream, const Implies &implies, PrintContext &printContext, bool omitParentheses = false);
output::ColorStream &print(output::ColorStream &stream, const Not &not_, PrintContext &printContext); output::ColorStream &print(output::ColorStream &stream, const Not &not_, PrintContext &printContext, bool omitParentheses = false);
output::ColorStream &print(output::ColorStream &stream, const Or &or_, PrintContext &printContext); output::ColorStream &print(output::ColorStream &stream, const Or &or_, PrintContext &printContext, bool omitParentheses = false);
output::ColorStream &print(output::ColorStream &stream, const Formula &formula, PrintContext &printContext); output::ColorStream &print(output::ColorStream &stream, const Formula &formula, PrintContext &printContext, bool omitParentheses = false);
output::ColorStream &print(output::ColorStream &stream, const Term &term, PrintContext &printContext); output::ColorStream &print(output::ColorStream &stream, const Term &term, PrintContext &printContext, bool omitParentheses = false);
//////////////////////////////////////////////////////////////////////////////////////////////////// ////////////////////////////////////////////////////////////////////////////////////////////////////
// Primitives // Primitives
//////////////////////////////////////////////////////////////////////////////////////////////////// ////////////////////////////////////////////////////////////////////////////////////////////////////
inline output::ColorStream &print(output::ColorStream &stream, BinaryOperation::Operator operator_, PrintContext &) inline output::ColorStream &print(output::ColorStream &stream, BinaryOperation::Operator operator_, PrintContext &, bool)
{ {
switch (operator_) switch (operator_)
{ {
@ -95,22 +96,26 @@ inline output::ColorStream &print(output::ColorStream &stream, BinaryOperation::
//////////////////////////////////////////////////////////////////////////////////////////////////// ////////////////////////////////////////////////////////////////////////////////////////////////////
inline output::ColorStream &print(output::ColorStream &stream, const BinaryOperation &binaryOperation, PrintContext &printContext) inline output::ColorStream &print(output::ColorStream &stream, const BinaryOperation &binaryOperation, PrintContext &printContext, bool omitParentheses)
{ {
stream << "("; if (!omitParentheses || printContext.context.parenthesisStyle == ParenthesisStyle::Full)
stream << "(";
print(stream, binaryOperation.left, printContext); print(stream, binaryOperation.left, printContext);
stream << " "; stream << " ";
print(stream, binaryOperation.operator_, printContext); print(stream, binaryOperation.operator_, printContext);
stream << " "; stream << " ";
print(stream, binaryOperation.right, printContext); print(stream, binaryOperation.right, printContext);
stream << ")";
if (!omitParentheses || printContext.context.parenthesisStyle == ParenthesisStyle::Full)
stream << ")";
return stream; return stream;
} }
//////////////////////////////////////////////////////////////////////////////////////////////////// ////////////////////////////////////////////////////////////////////////////////////////////////////
inline output::ColorStream &print(output::ColorStream &stream, const Boolean &boolean, PrintContext &) inline output::ColorStream &print(output::ColorStream &stream, const Boolean &boolean, PrintContext &, bool)
{ {
if (boolean.value) if (boolean.value)
return (stream << output::Boolean("#true")); return (stream << output::Boolean("#true"));
@ -120,7 +125,7 @@ inline output::ColorStream &print(output::ColorStream &stream, const Boolean &bo
//////////////////////////////////////////////////////////////////////////////////////////////////// ////////////////////////////////////////////////////////////////////////////////////////////////////
inline output::ColorStream &print(output::ColorStream &stream, Comparison::Operator operator_, PrintContext &) inline output::ColorStream &print(output::ColorStream &stream, Comparison::Operator operator_, PrintContext &, bool)
{ {
switch (operator_) switch (operator_)
{ {
@ -143,7 +148,7 @@ inline output::ColorStream &print(output::ColorStream &stream, Comparison::Opera
//////////////////////////////////////////////////////////////////////////////////////////////////// ////////////////////////////////////////////////////////////////////////////////////////////////////
inline output::ColorStream &print(output::ColorStream &stream, const Comparison &comparison, PrintContext &printContext) inline output::ColorStream &print(output::ColorStream &stream, const Comparison &comparison, PrintContext &printContext, bool)
{ {
if (printContext.context.parenthesisStyle == ParenthesisStyle::Full) if (printContext.context.parenthesisStyle == ParenthesisStyle::Full)
stream << "("; stream << "(";
@ -162,14 +167,14 @@ inline output::ColorStream &print(output::ColorStream &stream, const Comparison
//////////////////////////////////////////////////////////////////////////////////////////////////// ////////////////////////////////////////////////////////////////////////////////////////////////////
inline output::ColorStream &print(output::ColorStream &stream, const Constant &constant, PrintContext &) inline output::ColorStream &print(output::ColorStream &stream, const Constant &constant, PrintContext &, bool)
{ {
return (stream << constant.name); return (stream << constant.name);
} }
//////////////////////////////////////////////////////////////////////////////////////////////////// ////////////////////////////////////////////////////////////////////////////////////////////////////
inline output::ColorStream &print(output::ColorStream &stream, const Function &function, PrintContext &printContext) inline output::ColorStream &print(output::ColorStream &stream, const Function &function, PrintContext &printContext, bool)
{ {
stream << function.name; stream << function.name;
@ -196,7 +201,7 @@ inline output::ColorStream &print(output::ColorStream &stream, const Function &f
//////////////////////////////////////////////////////////////////////////////////////////////////// ////////////////////////////////////////////////////////////////////////////////////////////////////
inline output::ColorStream &print(output::ColorStream &stream, const In &in, PrintContext &printContext) inline output::ColorStream &print(output::ColorStream &stream, const In &in, PrintContext &printContext, bool)
{ {
if (printContext.context.parenthesisStyle == ParenthesisStyle::Full) if (printContext.context.parenthesisStyle == ParenthesisStyle::Full)
stream << "("; stream << "(";
@ -213,14 +218,14 @@ inline output::ColorStream &print(output::ColorStream &stream, const In &in, Pri
//////////////////////////////////////////////////////////////////////////////////////////////////// ////////////////////////////////////////////////////////////////////////////////////////////////////
inline output::ColorStream &print(output::ColorStream &stream, const Integer &integer, PrintContext &) inline output::ColorStream &print(output::ColorStream &stream, const Integer &integer, PrintContext &, bool)
{ {
return (stream << output::Number<int>(integer.value)); return (stream << output::Number<int>(integer.value));
} }
//////////////////////////////////////////////////////////////////////////////////////////////////// ////////////////////////////////////////////////////////////////////////////////////////////////////
inline output::ColorStream &print(output::ColorStream &stream, const Interval &interval, PrintContext &printContext) inline output::ColorStream &print(output::ColorStream &stream, const Interval &interval, PrintContext &printContext, bool)
{ {
if (printContext.context.parenthesisStyle == ParenthesisStyle::Full) if (printContext.context.parenthesisStyle == ParenthesisStyle::Full)
stream << "("; stream << "(";
@ -237,7 +242,7 @@ inline output::ColorStream &print(output::ColorStream &stream, const Interval &i
//////////////////////////////////////////////////////////////////////////////////////////////////// ////////////////////////////////////////////////////////////////////////////////////////////////////
inline output::ColorStream &print(output::ColorStream &stream, const Predicate &predicate, PrintContext &printContext) inline output::ColorStream &print(output::ColorStream &stream, const Predicate &predicate, PrintContext &printContext, bool)
{ {
stream << predicate.name; stream << predicate.name;
@ -261,7 +266,7 @@ inline output::ColorStream &print(output::ColorStream &stream, const Predicate &
//////////////////////////////////////////////////////////////////////////////////////////////////// ////////////////////////////////////////////////////////////////////////////////////////////////////
inline output::ColorStream &print(output::ColorStream &stream, const SpecialInteger &specialInteger, PrintContext &) inline output::ColorStream &print(output::ColorStream &stream, const SpecialInteger &specialInteger, PrintContext &, bool)
{ {
switch (specialInteger.type) switch (specialInteger.type)
{ {
@ -276,14 +281,14 @@ inline output::ColorStream &print(output::ColorStream &stream, const SpecialInte
//////////////////////////////////////////////////////////////////////////////////////////////////// ////////////////////////////////////////////////////////////////////////////////////////////////////
inline output::ColorStream &print(output::ColorStream &stream, const String &string, PrintContext &) inline output::ColorStream &print(output::ColorStream &stream, const String &string, PrintContext &, bool)
{ {
return (stream << output::String(string.text.c_str())); return (stream << output::String(string.text.c_str()));
} }
//////////////////////////////////////////////////////////////////////////////////////////////////// ////////////////////////////////////////////////////////////////////////////////////////////////////
inline output::ColorStream &print(output::ColorStream &stream, const UnaryOperation &unaryOperation, PrintContext &printContext) inline output::ColorStream &print(output::ColorStream &stream, const UnaryOperation &unaryOperation, PrintContext &printContext, bool)
{ {
switch (unaryOperation.operator_) switch (unaryOperation.operator_)
{ {
@ -292,7 +297,7 @@ inline output::ColorStream &print(output::ColorStream &stream, const UnaryOperat
break; break;
} }
print(stream, unaryOperation.argument, printContext); print(stream, unaryOperation.argument, printContext, true);
switch (unaryOperation.operator_) switch (unaryOperation.operator_)
{ {
@ -306,7 +311,7 @@ inline output::ColorStream &print(output::ColorStream &stream, const UnaryOperat
//////////////////////////////////////////////////////////////////////////////////////////////////// ////////////////////////////////////////////////////////////////////////////////////////////////////
inline output::ColorStream &print(output::ColorStream &stream, const Variable &variable, PrintContext &printContext) inline output::ColorStream &print(output::ColorStream &stream, const Variable &variable, PrintContext &printContext, bool)
{ {
assert(variable.declaration != nullptr); assert(variable.declaration != nullptr);
@ -315,7 +320,7 @@ inline output::ColorStream &print(output::ColorStream &stream, const Variable &v
//////////////////////////////////////////////////////////////////////////////////////////////////// ////////////////////////////////////////////////////////////////////////////////////////////////////
inline output::ColorStream &print(output::ColorStream &stream, const VariableDeclaration &variableDeclaration, PrintContext &printContext) inline output::ColorStream &print(output::ColorStream &stream, const VariableDeclaration &variableDeclaration, PrintContext &printContext, bool)
{ {
const auto printVariableDeclaration = const auto printVariableDeclaration =
[&stream, &variableDeclaration](const auto *prefix, auto &variableIDs) -> output::ColorStream & [&stream, &variableDeclaration](const auto *prefix, auto &variableIDs) -> output::ColorStream &
@ -351,9 +356,10 @@ inline output::ColorStream &print(output::ColorStream &stream, const VariableDec
// Expressions // Expressions
//////////////////////////////////////////////////////////////////////////////////////////////////// ////////////////////////////////////////////////////////////////////////////////////////////////////
inline output::ColorStream &print(output::ColorStream &stream, const And &and_, PrintContext &printContext) inline output::ColorStream &print(output::ColorStream &stream, const And &and_, PrintContext &printContext, bool omitParentheses)
{ {
stream << "("; if (!omitParentheses || printContext.context.parenthesisStyle == ParenthesisStyle::Full)
stream << "(";
for (auto i = and_.arguments.cbegin(); i != and_.arguments.cend(); i++) for (auto i = and_.arguments.cbegin(); i != and_.arguments.cend(); i++)
{ {
@ -363,27 +369,32 @@ inline output::ColorStream &print(output::ColorStream &stream, const And &and_,
print(stream, *i, printContext); print(stream, *i, printContext);
} }
stream << ")"; if (!omitParentheses || printContext.context.parenthesisStyle == ParenthesisStyle::Full)
stream << ")";
return stream; return stream;
} }
//////////////////////////////////////////////////////////////////////////////////////////////////// ////////////////////////////////////////////////////////////////////////////////////////////////////
inline output::ColorStream &print(output::ColorStream &stream, const Biconditional &biconditional, PrintContext &printContext) inline output::ColorStream &print(output::ColorStream &stream, const Biconditional &biconditional, PrintContext &printContext, bool omitParentheses)
{ {
stream << "("; if (!omitParentheses || printContext.context.parenthesisStyle == ParenthesisStyle::Full)
stream << "(";
print(stream, biconditional.left, printContext); print(stream, biconditional.left, printContext);
stream << " <-> "; stream << " <-> ";
print(stream, biconditional.right, printContext); print(stream, biconditional.right, printContext);
stream << ")";
if (!omitParentheses || printContext.context.parenthesisStyle == ParenthesisStyle::Full)
stream << ")";
return stream; return stream;
} }
//////////////////////////////////////////////////////////////////////////////////////////////////// ////////////////////////////////////////////////////////////////////////////////////////////////////
inline output::ColorStream &print(output::ColorStream &stream, const Exists &exists, PrintContext &printContext) inline output::ColorStream &print(output::ColorStream &stream, const Exists &exists, PrintContext &printContext, bool)
{ {
if (printContext.context.parenthesisStyle == ParenthesisStyle::Full) if (printContext.context.parenthesisStyle == ParenthesisStyle::Full)
stream << "("; stream << "(";
@ -409,7 +420,7 @@ inline output::ColorStream &print(output::ColorStream &stream, const Exists &exi
//////////////////////////////////////////////////////////////////////////////////////////////////// ////////////////////////////////////////////////////////////////////////////////////////////////////
inline output::ColorStream &print(output::ColorStream &stream, const ForAll &forAll, PrintContext &printContext) inline output::ColorStream &print(output::ColorStream &stream, const ForAll &forAll, PrintContext &printContext, bool)
{ {
if (printContext.context.parenthesisStyle == ParenthesisStyle::Full) if (printContext.context.parenthesisStyle == ParenthesisStyle::Full)
stream << "("; stream << "(";
@ -435,20 +446,24 @@ inline output::ColorStream &print(output::ColorStream &stream, const ForAll &for
//////////////////////////////////////////////////////////////////////////////////////////////////// ////////////////////////////////////////////////////////////////////////////////////////////////////
inline output::ColorStream &print(output::ColorStream &stream, const Implies &implies, PrintContext &printContext) inline output::ColorStream &print(output::ColorStream &stream, const Implies &implies, PrintContext &printContext, bool omitParentheses)
{ {
stream << "("; if (!omitParentheses || printContext.context.parenthesisStyle == ParenthesisStyle::Full)
stream << "(";
print(stream, implies.antecedent, printContext); print(stream, implies.antecedent, printContext);
stream << " -> "; stream << " -> ";
print(stream, implies.consequent, printContext); print(stream, implies.consequent, printContext);
stream << ")";
if (!omitParentheses || printContext.context.parenthesisStyle == ParenthesisStyle::Full)
stream << ")";
return stream; return stream;
} }
//////////////////////////////////////////////////////////////////////////////////////////////////// ////////////////////////////////////////////////////////////////////////////////////////////////////
inline output::ColorStream &print(output::ColorStream &stream, const Not &not_, PrintContext &printContext) inline output::ColorStream &print(output::ColorStream &stream, const Not &not_, PrintContext &printContext, bool)
{ {
if (printContext.context.parenthesisStyle == ParenthesisStyle::Full) if (printContext.context.parenthesisStyle == ParenthesisStyle::Full)
stream << "("; stream << "(";
@ -464,9 +479,10 @@ inline output::ColorStream &print(output::ColorStream &stream, const Not &not_,
//////////////////////////////////////////////////////////////////////////////////////////////////// ////////////////////////////////////////////////////////////////////////////////////////////////////
inline output::ColorStream &print(output::ColorStream &stream, const Or &or_, PrintContext &printContext) inline output::ColorStream &print(output::ColorStream &stream, const Or &or_, PrintContext &printContext, bool omitParentheses)
{ {
stream << "("; if (!omitParentheses || printContext.context.parenthesisStyle == ParenthesisStyle::Full)
stream << "(";
for (auto i = or_.arguments.cbegin(); i != or_.arguments.cend(); i++) for (auto i = or_.arguments.cbegin(); i != or_.arguments.cend(); i++)
{ {
@ -476,7 +492,8 @@ inline output::ColorStream &print(output::ColorStream &stream, const Or &or_, Pr
print(stream, *i, printContext); print(stream, *i, printContext);
} }
stream << ")"; if (!omitParentheses || printContext.context.parenthesisStyle == ParenthesisStyle::Full)
stream << ")";
return stream; return stream;
} }
@ -489,24 +506,24 @@ template<class Variant>
struct VariantPrintVisitor struct VariantPrintVisitor
{ {
template<class T> template<class T>
output::ColorStream &visit(const T &x, output::ColorStream &stream, PrintContext &printContext) output::ColorStream &visit(const T &x, output::ColorStream &stream, PrintContext &printContext, bool omitParentheses)
{ {
return print(stream, x, printContext); return print(stream, x, printContext, omitParentheses);
} }
}; };
//////////////////////////////////////////////////////////////////////////////////////////////////// ////////////////////////////////////////////////////////////////////////////////////////////////////
inline output::ColorStream &print(output::ColorStream &stream, const Formula &formula, PrintContext &printContext) inline output::ColorStream &print(output::ColorStream &stream, const Formula &formula, PrintContext &printContext, bool omitParentheses)
{ {
return formula.accept(VariantPrintVisitor<Formula>(), stream, printContext); return formula.accept(VariantPrintVisitor<Formula>(), stream, printContext, omitParentheses);
} }
//////////////////////////////////////////////////////////////////////////////////////////////////// ////////////////////////////////////////////////////////////////////////////////////////////////////
inline output::ColorStream &print(output::ColorStream &stream, const Term &term, PrintContext &printContext) inline output::ColorStream &print(output::ColorStream &stream, const Term &term, PrintContext &printContext, bool omitParentheses)
{ {
return term.accept(VariantPrintVisitor<Term>(), stream, printContext); return term.accept(VariantPrintVisitor<Term>(), stream, printContext, omitParentheses);
} }
//////////////////////////////////////////////////////////////////////////////////////////////////// ////////////////////////////////////////////////////////////////////////////////////////////////////

2
tests/TestCompletion.cpp
View File

@ -190,6 +190,6 @@ TEST_CASE("[completion] Rules are completed", "[completion]")
input << "adj(X, Y) :- X = 1..n, Y = 1..n, |X - Y| = 1."; input << "adj(X, Y) :- X = 1..n, Y = 1..n, |X - Y| = 1.";
anthem::translate("input", input, context); anthem::translate("input", input, context);
CHECK(output.str() == "forall V1, V2 (adj(V1, V2) <-> (V1 in 1..n and V2 in 1..n and |(V1 - V2)| = 1))\n"); CHECK(output.str() == "forall V1, V2 (adj(V1, V2) <-> (V1 in 1..n and V2 in 1..n and |V1 - V2| = 1))\n");
} }
} }