Split formatting utils into separate files
For clarity, this moves the formatting functionality related to formulas and terms into two separate files.
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GPG Key ID:
05F3611E97A70ABF
492
src/format.rs
492
src/format.rs
@ -1,493 +1,7 @@
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mod formulas;
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mod terms;
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trait Precedence
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{
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fn precedence(&self) -> i32;
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}
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impl Precedence for crate::Term
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{
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fn precedence(&self) -> i32
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{
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match &self
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{
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Self::Boolean(_)
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| Self::Function(_)
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| Self::SpecialInteger(_)
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| Self::Integer(_)
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| Self::String(_)
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| Self::Variable(_)
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| Self::UnaryOperation(
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crate::UnaryOperation{operator: crate::UnaryOperator::AbsoluteValue, ..})
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=> 0,
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Self::UnaryOperation(
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crate::UnaryOperation{operator: crate::UnaryOperator::Negative, ..})
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=> 1,
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Self::BinaryOperation(
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crate::BinaryOperation{operator: crate::BinaryOperator::Exponentiate, ..})
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=> 2,
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Self::BinaryOperation(
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crate::BinaryOperation{operator: crate::BinaryOperator::Multiply, ..})
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| Self::BinaryOperation(
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crate::BinaryOperation{operator: crate::BinaryOperator::Divide, ..})
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| Self::BinaryOperation(
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crate::BinaryOperation{operator: crate::BinaryOperator::Modulo, ..})
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=> 3,
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Self::BinaryOperation(crate::BinaryOperation{operator: crate::BinaryOperator::Add, ..})
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| Self::BinaryOperation(
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crate::BinaryOperation{operator: crate::BinaryOperator::Subtract, ..})
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=> 4,
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}
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}
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}
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impl Precedence for crate::Formula
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{
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fn precedence(&self) -> i32
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{
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match &self
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{
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Self::Predicate(_)
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| Self::Boolean(_)
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| Self::Compare(_)
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=> 0,
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Self::Exists(_)
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| Self::ForAll(_)
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=> 1,
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Self::Not(_)
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=> 2,
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Self::And(_)
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=> 3,
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Self::Or(_)
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=> 4,
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Self::Implies(_)
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=> 5,
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Self::IfAndOnlyIf(_)
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=> 6,
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}
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}
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}
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impl std::fmt::Debug for crate::SpecialInteger
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{
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fn fmt(&self, format: &mut std::fmt::Formatter) -> std::fmt::Result
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{
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match &self
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{
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Self::Infimum => write!(format, "#inf"),
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Self::Supremum => write!(format, "#sup"),
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}
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}
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}
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impl std::fmt::Display for crate::SpecialInteger
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{
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fn fmt(&self, format: &mut std::fmt::Formatter) -> std::fmt::Result
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{
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write!(format, "{:?}", &self)
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}
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}
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impl std::fmt::Debug for crate::FunctionDeclaration
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{
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fn fmt(&self, format: &mut std::fmt::Formatter) -> std::fmt::Result
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{
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write!(format, "{}/{}", &self.name, self.arity)
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}
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}
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impl std::fmt::Display for crate::FunctionDeclaration
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{
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fn fmt(&self, format: &mut std::fmt::Formatter) -> std::fmt::Result
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{
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write!(format, "{:?}", &self)
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}
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}
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impl std::fmt::Debug for crate::PredicateDeclaration
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{
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fn fmt(&self, format: &mut std::fmt::Formatter) -> std::fmt::Result
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{
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write!(format, "{}/{}", &self.name, self.arity)
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}
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}
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impl std::fmt::Display for crate::PredicateDeclaration
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{
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fn fmt(&self, format: &mut std::fmt::Formatter) -> std::fmt::Result
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{
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write!(format, "{:?}", &self)
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}
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}
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impl std::fmt::Debug for crate::VariableDeclaration
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{
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fn fmt(&self, format: &mut std::fmt::Formatter) -> std::fmt::Result
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{
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write!(format, "{}", &self.name)
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}
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}
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impl std::fmt::Display for crate::VariableDeclaration
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{
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fn fmt(&self, format: &mut std::fmt::Formatter) -> std::fmt::Result
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{
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write!(format, "{:?}", &self)
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}
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}
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struct TermDisplay<'term>
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{
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parent_precedence: Option<i32>,
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term: &'term crate::Term,
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}
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fn display_term(term: &crate::Term, parent_precedence: Option<i32>) -> TermDisplay
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{
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TermDisplay
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{
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parent_precedence,
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term,
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}
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}
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impl<'term> std::fmt::Debug for TermDisplay<'term>
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{
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fn fmt(&self, format: &mut std::fmt::Formatter) -> std::fmt::Result
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{
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let precedence = self.term.precedence();
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let requires_parentheses = match self.parent_precedence
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{
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Some(parent_precedence) => precedence > parent_precedence,
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None => false,
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};
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if requires_parentheses
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{
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write!(format, "(")?;
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}
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match &self.term
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{
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crate::Term::Boolean(true) => write!(format, "true"),
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crate::Term::Boolean(false) => write!(format, "false"),
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crate::Term::SpecialInteger(value) => write!(format, "{:?}", value),
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crate::Term::Integer(value) => write!(format, "{}", value),
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crate::Term::String(value) => write!(format, "\"{}\"", value),
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crate::Term::Variable(variable) => write!(format, "{:?}", variable.declaration),
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crate::Term::Function(function) =>
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{
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write!(format, "{}", function.declaration.name)?;
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assert!(function.declaration.arity == function.arguments.len(),
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"number of function arguments differs from declaration (expected {}, got {})",
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function.declaration.arity, function.arguments.len());
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if !function.arguments.is_empty()
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{
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write!(format, "(")?;
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let mut separator = "";
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for argument in &function.arguments
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{
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write!(format, "{}{:?}", separator, display_term(&argument, None))?;
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separator = ", ";
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}
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write!(format, ")")?;
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}
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Ok(())
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},
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crate::Term::BinaryOperation(binary_operation) =>
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{
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let operator_string = match binary_operation.operator
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{
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crate::BinaryOperator::Add => "+",
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crate::BinaryOperator::Subtract => "-",
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crate::BinaryOperator::Multiply => "*",
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crate::BinaryOperator::Divide => "/",
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crate::BinaryOperator::Modulo => "%",
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crate::BinaryOperator::Exponentiate => "**",
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};
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let left_requires_parentheses = binary_operation.left.precedence() == precedence
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// Exponentiation is right-associative and thus requires parentheses when
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// nested on the left side
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&& binary_operation.operator == crate::BinaryOperator::Exponentiate;
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// The subtraction, division, and modulo operators require parentheses around the
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// right argument even if it has the same precedence
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let operator_requires_right_priority = match binary_operation.operator
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{
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crate::BinaryOperator::Subtract
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| crate::BinaryOperator::Divide
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| crate::BinaryOperator::Modulo
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=> true,
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_ => false,
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};
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// Additionally, modulo operations nested to the right of another multiplicative
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// operation always require parentheses
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let right_requires_priority = match *binary_operation.right
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{
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crate::Term::BinaryOperation(
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crate::BinaryOperation{operator: crate::BinaryOperator::Modulo, ..})
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=> true,
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_ => false,
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};
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let right_requires_parentheses = binary_operation.right.precedence() == precedence
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&& (operator_requires_right_priority || right_requires_priority);
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if left_requires_parentheses
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{
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write!(format, "(")?;
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}
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write!(format, "{:?}", display_term(&binary_operation.left, Some(precedence)))?;
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if left_requires_parentheses
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{
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write!(format, ")")?;
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}
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write!(format, " {} ", operator_string)?;
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if right_requires_parentheses
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{
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write!(format, "(")?;
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}
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write!(format, "{:?}", display_term(&binary_operation.right, Some(precedence)))?;
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if right_requires_parentheses
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{
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write!(format, ")")?;
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}
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Ok(())
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},
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crate::Term::UnaryOperation(
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crate::UnaryOperation{operator: crate::UnaryOperator::Negative, argument})
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=> write!(format, "-{:?}", display_term(argument, Some(precedence))),
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crate::Term::UnaryOperation(
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crate::UnaryOperation{operator: crate::UnaryOperator::AbsoluteValue, argument})
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=> write!(format, "|{:?}|", display_term(argument, None)),
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}?;
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if requires_parentheses
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{
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write!(format, ")")?;
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}
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Ok(())
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}
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}
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impl<'term> std::fmt::Display for TermDisplay<'term>
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{
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fn fmt(&self, format: &mut std::fmt::Formatter) -> std::fmt::Result
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{
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write!(format, "{:?}", self)
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}
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}
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struct FormulaDisplay<'formula>
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{
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parent_precedence: Option<i32>,
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formula: &'formula crate::Formula,
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}
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fn display_formula(formula: &crate::Formula, parent_precedence: Option<i32>) -> FormulaDisplay
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{
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FormulaDisplay
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{
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parent_precedence,
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formula,
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}
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}
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impl<'formula> std::fmt::Debug for FormulaDisplay<'formula>
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{
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fn fmt(&self, format: &mut std::fmt::Formatter) -> std::fmt::Result
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{
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let precedence = self.formula.precedence();
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let requires_parentheses = match self.parent_precedence
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{
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Some(parent_precedence) => precedence > parent_precedence,
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None => false,
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};
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let precedence = Some(precedence);
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if requires_parentheses
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{
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write!(format, "(")?;
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}
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match &self.formula
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{
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crate::Formula::Exists(exists) =>
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{
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assert!(!exists.parameters.is_empty());
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write!(format, "exists")?;
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let mut separator = " ";
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for parameter in exists.parameters.iter()
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{
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write!(format, "{}{:?}", separator, parameter)?;
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separator = ", "
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}
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write!(format, " {:?}", display_formula(&exists.argument, precedence))?;
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},
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crate::Formula::ForAll(for_all) =>
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{
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assert!(!for_all.parameters.is_empty());
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write!(format, "forall")?;
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let mut separator = " ";
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for parameter in for_all.parameters.iter()
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{
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write!(format, "{}{:?}", separator, parameter)?;
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separator = ", "
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}
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write!(format, " {:?}", display_formula(&for_all.argument, precedence))?;
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},
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crate::Formula::Not(argument) => write!(format, "not {:?}",
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display_formula(argument, precedence))?,
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crate::Formula::And(arguments) =>
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{
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let mut separator = "";
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assert!(!arguments.is_empty());
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for argument in arguments
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{
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write!(format, "{}{:?}", separator, display_formula(argument, precedence))?;
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separator = " and "
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}
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},
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crate::Formula::Or(arguments) =>
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{
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let mut separator = "";
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assert!(!arguments.is_empty());
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for argument in arguments
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{
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write!(format, "{}{:?}", separator, display_formula(argument, precedence))?;
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separator = " or "
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}
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},
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crate::Formula::Implies(crate::Implies{antecedent, implication})
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=> write!(format, "{:?} -> {:?}", display_formula(antecedent, precedence),
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display_formula(implication, precedence))?,
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crate::Formula::IfAndOnlyIf(crate::IfAndOnlyIf{left, right})
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=> write!(format, "{:?} <-> {:?}", display_formula(left, precedence),
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display_formula(right, precedence))?,
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crate::Formula::Compare(
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crate::Compare{operator: crate::ComparisonOperator::Less, left, right})
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=> write!(format, "{:?} < {:?}", display_term(left, None),
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display_term(right, None))?,
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crate::Formula::Compare(
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crate::Compare{operator: crate::ComparisonOperator::LessOrEqual, left, right})
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=> write!(format, "{:?} <= {:?}", display_term(left, None),
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display_term(right, None))?,
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crate::Formula::Compare(
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crate::Compare{operator: crate::ComparisonOperator::Greater, left, right})
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=> write!(format, "{:?} > {:?}", display_term(left, None),
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display_term(right, None))?,
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crate::Formula::Compare(
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crate::Compare{operator: crate::ComparisonOperator::GreaterOrEqual, left, right})
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=> write!(format, "{:?} >= {:?}", display_term(left, None),
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display_term(right, None))?,
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crate::Formula::Compare(
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crate::Compare{operator: crate::ComparisonOperator::Equal, left, right})
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=> write!(format, "{:?} = {:?}", display_term(left, None),
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display_term(right, None))?,
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crate::Formula::Compare(
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crate::Compare{operator: crate::ComparisonOperator::NotEqual, left, right})
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=> write!(format, "{:?} != {:?}", display_term(left, None),
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display_term(right, None))?,
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crate::Formula::Boolean(true) => write!(format, "true")?,
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crate::Formula::Boolean(false) => write!(format, "false")?,
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crate::Formula::Predicate(predicate) =>
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{
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write!(format, "{}", predicate.declaration.name)?;
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if !predicate.arguments.is_empty()
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{
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write!(format, "(")?;
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let mut separator = "";
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for argument in &predicate.arguments
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{
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write!(format, "{}{:?}", separator, display_term(argument, None))?;
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separator = ", "
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}
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write!(format, ")")?;
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}
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},
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}
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if requires_parentheses
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{
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write!(format, ")")?;
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}
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Ok(())
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}
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}
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impl<'formula> std::fmt::Display for FormulaDisplay<'formula>
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{
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fn fmt(&self, format: &mut std::fmt::Formatter) -> std::fmt::Result
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{
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write!(format, "{:?}", self)
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}
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}
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impl std::fmt::Debug for crate::Formula
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{
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fn fmt(&self, format: &mut std::fmt::Formatter) -> std::fmt::Result
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{
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write!(format, "{:?}", display_formula(&self, None))
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}
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}
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impl std::fmt::Display for crate::Formula
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{
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fn fmt(&self, format: &mut std::fmt::Formatter) -> std::fmt::Result
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{
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write!(format, "{}", display_formula(&self, None))
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}
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}
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impl std::fmt::Debug for crate::Term
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{
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fn fmt(&self, format: &mut std::fmt::Formatter) -> std::fmt::Result
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{
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write!(format, "{:?}", display_term(&self, None))
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}
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}
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impl std::fmt::Display for crate::Term
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{
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fn fmt(&self, format: &mut std::fmt::Formatter) -> std::fmt::Result
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{
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write!(format, "{}", display_term(&self, None))
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}
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}
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228
src/format/formulas.rs
Normal file
228
src/format/formulas.rs
Normal file
@ -0,0 +1,228 @@
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use super::Precedence;
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use super::terms::*;
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impl Precedence for crate::Formula
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{
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fn precedence(&self) -> i32
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{
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match &self
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{
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Self::Predicate(_)
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| Self::Boolean(_)
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| Self::Compare(_)
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=> 0,
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Self::Exists(_)
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| Self::ForAll(_)
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=> 1,
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Self::Not(_)
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=> 2,
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Self::And(_)
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=> 3,
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Self::Or(_)
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=> 4,
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Self::Implies(_)
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=> 5,
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Self::IfAndOnlyIf(_)
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=> 6,
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}
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}
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}
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impl std::fmt::Debug for crate::PredicateDeclaration
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{
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fn fmt(&self, format: &mut std::fmt::Formatter) -> std::fmt::Result
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{
|
||||
write!(format, "{}/{}", &self.name, self.arity)
|
||||
}
|
||||
}
|
||||
|
||||
impl std::fmt::Display for crate::PredicateDeclaration
|
||||
{
|
||||
fn fmt(&self, format: &mut std::fmt::Formatter) -> std::fmt::Result
|
||||
{
|
||||
write!(format, "{:?}", &self)
|
||||
}
|
||||
}
|
||||
|
||||
struct FormulaDisplay<'formula>
|
||||
{
|
||||
parent_precedence: Option<i32>,
|
||||
formula: &'formula crate::Formula,
|
||||
}
|
||||
|
||||
fn display_formula(formula: &crate::Formula, parent_precedence: Option<i32>) -> FormulaDisplay
|
||||
{
|
||||
FormulaDisplay
|
||||
{
|
||||
parent_precedence,
|
||||
formula,
|
||||
}
|
||||
}
|
||||
|
||||
impl<'formula> std::fmt::Debug for FormulaDisplay<'formula>
|
||||
{
|
||||
fn fmt(&self, format: &mut std::fmt::Formatter) -> std::fmt::Result
|
||||
{
|
||||
let precedence = self.formula.precedence();
|
||||
let requires_parentheses = match self.parent_precedence
|
||||
{
|
||||
Some(parent_precedence) => precedence > parent_precedence,
|
||||
None => false,
|
||||
};
|
||||
let precedence = Some(precedence);
|
||||
|
||||
if requires_parentheses
|
||||
{
|
||||
write!(format, "(")?;
|
||||
}
|
||||
|
||||
match &self.formula
|
||||
{
|
||||
crate::Formula::Exists(exists) =>
|
||||
{
|
||||
assert!(!exists.parameters.is_empty());
|
||||
|
||||
write!(format, "exists")?;
|
||||
|
||||
let mut separator = " ";
|
||||
|
||||
for parameter in exists.parameters.iter()
|
||||
{
|
||||
write!(format, "{}{:?}", separator, parameter)?;
|
||||
|
||||
separator = ", "
|
||||
}
|
||||
|
||||
write!(format, " {:?}", display_formula(&exists.argument, precedence))?;
|
||||
},
|
||||
crate::Formula::ForAll(for_all) =>
|
||||
{
|
||||
assert!(!for_all.parameters.is_empty());
|
||||
|
||||
write!(format, "forall")?;
|
||||
|
||||
let mut separator = " ";
|
||||
|
||||
for parameter in for_all.parameters.iter()
|
||||
{
|
||||
write!(format, "{}{:?}", separator, parameter)?;
|
||||
|
||||
separator = ", "
|
||||
}
|
||||
|
||||
write!(format, " {:?}", display_formula(&for_all.argument, precedence))?;
|
||||
},
|
||||
crate::Formula::Not(argument) => write!(format, "not {:?}",
|
||||
display_formula(argument, precedence))?,
|
||||
crate::Formula::And(arguments) =>
|
||||
{
|
||||
let mut separator = "";
|
||||
|
||||
assert!(!arguments.is_empty());
|
||||
|
||||
for argument in arguments
|
||||
{
|
||||
write!(format, "{}{:?}", separator, display_formula(argument, precedence))?;
|
||||
|
||||
separator = " and "
|
||||
}
|
||||
},
|
||||
crate::Formula::Or(arguments) =>
|
||||
{
|
||||
let mut separator = "";
|
||||
|
||||
assert!(!arguments.is_empty());
|
||||
|
||||
for argument in arguments
|
||||
{
|
||||
write!(format, "{}{:?}", separator, display_formula(argument, precedence))?;
|
||||
|
||||
separator = " or "
|
||||
}
|
||||
},
|
||||
crate::Formula::Implies(crate::Implies{antecedent, implication})
|
||||
=> write!(format, "{:?} -> {:?}", display_formula(antecedent, precedence),
|
||||
display_formula(implication, precedence))?,
|
||||
crate::Formula::IfAndOnlyIf(crate::IfAndOnlyIf{left, right})
|
||||
=> write!(format, "{:?} <-> {:?}", display_formula(left, precedence),
|
||||
display_formula(right, precedence))?,
|
||||
crate::Formula::Compare(
|
||||
crate::Compare{operator: crate::ComparisonOperator::Less, left, right})
|
||||
=> write!(format, "{:?} < {:?}", display_term(left, None),
|
||||
display_term(right, None))?,
|
||||
crate::Formula::Compare(
|
||||
crate::Compare{operator: crate::ComparisonOperator::LessOrEqual, left, right})
|
||||
=> write!(format, "{:?} <= {:?}", display_term(left, None),
|
||||
display_term(right, None))?,
|
||||
crate::Formula::Compare(
|
||||
crate::Compare{operator: crate::ComparisonOperator::Greater, left, right})
|
||||
=> write!(format, "{:?} > {:?}", display_term(left, None),
|
||||
display_term(right, None))?,
|
||||
crate::Formula::Compare(
|
||||
crate::Compare{operator: crate::ComparisonOperator::GreaterOrEqual, left, right})
|
||||
=> write!(format, "{:?} >= {:?}", display_term(left, None),
|
||||
display_term(right, None))?,
|
||||
crate::Formula::Compare(
|
||||
crate::Compare{operator: crate::ComparisonOperator::Equal, left, right})
|
||||
=> write!(format, "{:?} = {:?}", display_term(left, None),
|
||||
display_term(right, None))?,
|
||||
crate::Formula::Compare(
|
||||
crate::Compare{operator: crate::ComparisonOperator::NotEqual, left, right})
|
||||
=> write!(format, "{:?} != {:?}", display_term(left, None),
|
||||
display_term(right, None))?,
|
||||
crate::Formula::Boolean(true) => write!(format, "true")?,
|
||||
crate::Formula::Boolean(false) => write!(format, "false")?,
|
||||
crate::Formula::Predicate(predicate) =>
|
||||
{
|
||||
write!(format, "{}", predicate.declaration.name)?;
|
||||
|
||||
if !predicate.arguments.is_empty()
|
||||
{
|
||||
write!(format, "(")?;
|
||||
|
||||
let mut separator = "";
|
||||
|
||||
for argument in &predicate.arguments
|
||||
{
|
||||
write!(format, "{}{:?}", separator, display_term(argument, None))?;
|
||||
|
||||
separator = ", "
|
||||
}
|
||||
|
||||
write!(format, ")")?;
|
||||
}
|
||||
},
|
||||
}
|
||||
|
||||
if requires_parentheses
|
||||
{
|
||||
write!(format, ")")?;
|
||||
}
|
||||
|
||||
Ok(())
|
||||
}
|
||||
}
|
||||
|
||||
impl<'formula> std::fmt::Display for FormulaDisplay<'formula>
|
||||
{
|
||||
fn fmt(&self, format: &mut std::fmt::Formatter) -> std::fmt::Result
|
||||
{
|
||||
write!(format, "{:?}", self)
|
||||
}
|
||||
}
|
||||
|
||||
impl std::fmt::Debug for crate::Formula
|
||||
{
|
||||
fn fmt(&self, format: &mut std::fmt::Formatter) -> std::fmt::Result
|
||||
{
|
||||
write!(format, "{:?}", display_formula(&self, None))
|
||||
}
|
||||
}
|
||||
|
||||
impl std::fmt::Display for crate::Formula
|
||||
{
|
||||
fn fmt(&self, format: &mut std::fmt::Formatter) -> std::fmt::Result
|
||||
{
|
||||
write!(format, "{}", display_formula(&self, None))
|
||||
}
|
||||
}
|
||||
264
src/format/terms.rs
Normal file
264
src/format/terms.rs
Normal file
@ -0,0 +1,264 @@
|
||||
use super::Precedence;
|
||||
|
||||
impl Precedence for crate::Term
|
||||
{
|
||||
fn precedence(&self) -> i32
|
||||
{
|
||||
match &self
|
||||
{
|
||||
Self::Boolean(_)
|
||||
| Self::Function(_)
|
||||
| Self::SpecialInteger(_)
|
||||
| Self::Integer(_)
|
||||
| Self::String(_)
|
||||
| Self::Variable(_)
|
||||
| Self::UnaryOperation(
|
||||
crate::UnaryOperation{operator: crate::UnaryOperator::AbsoluteValue, ..})
|
||||
=> 0,
|
||||
Self::UnaryOperation(
|
||||
crate::UnaryOperation{operator: crate::UnaryOperator::Negative, ..})
|
||||
=> 1,
|
||||
Self::BinaryOperation(
|
||||
crate::BinaryOperation{operator: crate::BinaryOperator::Exponentiate, ..})
|
||||
=> 2,
|
||||
Self::BinaryOperation(
|
||||
crate::BinaryOperation{operator: crate::BinaryOperator::Multiply, ..})
|
||||
| Self::BinaryOperation(
|
||||
crate::BinaryOperation{operator: crate::BinaryOperator::Divide, ..})
|
||||
| Self::BinaryOperation(
|
||||
crate::BinaryOperation{operator: crate::BinaryOperator::Modulo, ..})
|
||||
=> 3,
|
||||
Self::BinaryOperation(crate::BinaryOperation{operator: crate::BinaryOperator::Add, ..})
|
||||
| Self::BinaryOperation(
|
||||
crate::BinaryOperation{operator: crate::BinaryOperator::Subtract, ..})
|
||||
=> 4,
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
impl std::fmt::Debug for crate::SpecialInteger
|
||||
{
|
||||
fn fmt(&self, format: &mut std::fmt::Formatter) -> std::fmt::Result
|
||||
{
|
||||
match &self
|
||||
{
|
||||
Self::Infimum => write!(format, "#inf"),
|
||||
Self::Supremum => write!(format, "#sup"),
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
impl std::fmt::Display for crate::SpecialInteger
|
||||
{
|
||||
fn fmt(&self, format: &mut std::fmt::Formatter) -> std::fmt::Result
|
||||
{
|
||||
write!(format, "{:?}", &self)
|
||||
}
|
||||
}
|
||||
|
||||
impl std::fmt::Debug for crate::FunctionDeclaration
|
||||
{
|
||||
fn fmt(&self, format: &mut std::fmt::Formatter) -> std::fmt::Result
|
||||
{
|
||||
write!(format, "{}/{}", &self.name, self.arity)
|
||||
}
|
||||
}
|
||||
|
||||
impl std::fmt::Display for crate::FunctionDeclaration
|
||||
{
|
||||
fn fmt(&self, format: &mut std::fmt::Formatter) -> std::fmt::Result
|
||||
{
|
||||
write!(format, "{:?}", &self)
|
||||
}
|
||||
}
|
||||
|
||||
impl std::fmt::Debug for crate::VariableDeclaration
|
||||
{
|
||||
fn fmt(&self, format: &mut std::fmt::Formatter) -> std::fmt::Result
|
||||
{
|
||||
write!(format, "{}", &self.name)
|
||||
}
|
||||
}
|
||||
|
||||
impl std::fmt::Display for crate::VariableDeclaration
|
||||
{
|
||||
fn fmt(&self, format: &mut std::fmt::Formatter) -> std::fmt::Result
|
||||
{
|
||||
write!(format, "{:?}", &self)
|
||||
}
|
||||
}
|
||||
|
||||
pub(crate) struct TermDisplay<'term>
|
||||
{
|
||||
parent_precedence: Option<i32>,
|
||||
term: &'term crate::Term,
|
||||
}
|
||||
|
||||
pub(crate) fn display_term(term: &crate::Term, parent_precedence: Option<i32>) -> TermDisplay
|
||||
{
|
||||
TermDisplay
|
||||
{
|
||||
parent_precedence,
|
||||
term,
|
||||
}
|
||||
}
|
||||
|
||||
impl<'term> std::fmt::Debug for TermDisplay<'term>
|
||||
{
|
||||
fn fmt(&self, format: &mut std::fmt::Formatter) -> std::fmt::Result
|
||||
{
|
||||
let precedence = self.term.precedence();
|
||||
let requires_parentheses = match self.parent_precedence
|
||||
{
|
||||
Some(parent_precedence) => precedence > parent_precedence,
|
||||
None => false,
|
||||
};
|
||||
|
||||
if requires_parentheses
|
||||
{
|
||||
write!(format, "(")?;
|
||||
}
|
||||
|
||||
match &self.term
|
||||
{
|
||||
crate::Term::Boolean(true) => write!(format, "true"),
|
||||
crate::Term::Boolean(false) => write!(format, "false"),
|
||||
crate::Term::SpecialInteger(value) => write!(format, "{:?}", value),
|
||||
crate::Term::Integer(value) => write!(format, "{}", value),
|
||||
crate::Term::String(value) => write!(format, "\"{}\"", value),
|
||||
crate::Term::Variable(variable) => write!(format, "{:?}", variable.declaration),
|
||||
crate::Term::Function(function) =>
|
||||
{
|
||||
write!(format, "{}", function.declaration.name)?;
|
||||
|
||||
assert!(function.declaration.arity == function.arguments.len(),
|
||||
"number of function arguments differs from declaration (expected {}, got {})",
|
||||
function.declaration.arity, function.arguments.len());
|
||||
|
||||
if !function.arguments.is_empty()
|
||||
{
|
||||
write!(format, "(")?;
|
||||
|
||||
let mut separator = "";
|
||||
|
||||
for argument in &function.arguments
|
||||
{
|
||||
write!(format, "{}{:?}", separator, display_term(&argument, None))?;
|
||||
|
||||
separator = ", ";
|
||||
}
|
||||
|
||||
write!(format, ")")?;
|
||||
}
|
||||
|
||||
Ok(())
|
||||
},
|
||||
crate::Term::BinaryOperation(binary_operation) =>
|
||||
{
|
||||
let operator_string = match binary_operation.operator
|
||||
{
|
||||
crate::BinaryOperator::Add => "+",
|
||||
crate::BinaryOperator::Subtract => "-",
|
||||
crate::BinaryOperator::Multiply => "*",
|
||||
crate::BinaryOperator::Divide => "/",
|
||||
crate::BinaryOperator::Modulo => "%",
|
||||
crate::BinaryOperator::Exponentiate => "**",
|
||||
};
|
||||
|
||||
let left_requires_parentheses = binary_operation.left.precedence() == precedence
|
||||
// Exponentiation is right-associative and thus requires parentheses when
|
||||
// nested on the left side
|
||||
&& binary_operation.operator == crate::BinaryOperator::Exponentiate;
|
||||
|
||||
// The subtraction, division, and modulo operators require parentheses around the
|
||||
// right argument even if it has the same precedence
|
||||
let operator_requires_right_priority = match binary_operation.operator
|
||||
{
|
||||
crate::BinaryOperator::Subtract
|
||||
| crate::BinaryOperator::Divide
|
||||
| crate::BinaryOperator::Modulo
|
||||
=> true,
|
||||
_ => false,
|
||||
};
|
||||
|
||||
// Additionally, modulo operations nested to the right of another multiplicative
|
||||
// operation always require parentheses
|
||||
let right_requires_priority = match *binary_operation.right
|
||||
{
|
||||
crate::Term::BinaryOperation(
|
||||
crate::BinaryOperation{operator: crate::BinaryOperator::Modulo, ..})
|
||||
=> true,
|
||||
_ => false,
|
||||
};
|
||||
|
||||
let right_requires_parentheses = binary_operation.right.precedence() == precedence
|
||||
&& (operator_requires_right_priority || right_requires_priority);
|
||||
|
||||
if left_requires_parentheses
|
||||
{
|
||||
write!(format, "(")?;
|
||||
}
|
||||
|
||||
write!(format, "{:?}", display_term(&binary_operation.left, Some(precedence)))?;
|
||||
|
||||
if left_requires_parentheses
|
||||
{
|
||||
write!(format, ")")?;
|
||||
}
|
||||
|
||||
write!(format, " {} ", operator_string)?;
|
||||
|
||||
if right_requires_parentheses
|
||||
{
|
||||
write!(format, "(")?;
|
||||
}
|
||||
|
||||
write!(format, "{:?}", display_term(&binary_operation.right, Some(precedence)))?;
|
||||
|
||||
if right_requires_parentheses
|
||||
{
|
||||
write!(format, ")")?;
|
||||
}
|
||||
|
||||
Ok(())
|
||||
},
|
||||
crate::Term::UnaryOperation(
|
||||
crate::UnaryOperation{operator: crate::UnaryOperator::Negative, argument})
|
||||
=> write!(format, "-{:?}", display_term(argument, Some(precedence))),
|
||||
crate::Term::UnaryOperation(
|
||||
crate::UnaryOperation{operator: crate::UnaryOperator::AbsoluteValue, argument})
|
||||
=> write!(format, "|{:?}|", display_term(argument, None)),
|
||||
}?;
|
||||
|
||||
if requires_parentheses
|
||||
{
|
||||
write!(format, ")")?;
|
||||
}
|
||||
|
||||
Ok(())
|
||||
}
|
||||
}
|
||||
|
||||
impl<'term> std::fmt::Display for TermDisplay<'term>
|
||||
{
|
||||
fn fmt(&self, format: &mut std::fmt::Formatter) -> std::fmt::Result
|
||||
{
|
||||
write!(format, "{:?}", self)
|
||||
}
|
||||
}
|
||||
|
||||
impl std::fmt::Debug for crate::Term
|
||||
{
|
||||
fn fmt(&self, format: &mut std::fmt::Formatter) -> std::fmt::Result
|
||||
{
|
||||
write!(format, "{:?}", display_term(&self, None))
|
||||
}
|
||||
}
|
||||
|
||||
impl std::fmt::Display for crate::Term
|
||||
{
|
||||
fn fmt(&self, format: &mut std::fmt::Formatter) -> std::fmt::Result
|
||||
{
|
||||
write!(format, "{}", display_term(&self, None))
|
||||
}
|
||||
}
|
||||
Loading…
Reference in New Issue
Block a user