266 lines
6.8 KiB
Rust
266 lines
6.8 KiB
Rust
use super::*;
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impl super::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::SpecialInteger(_)
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| Self::Integer(_)
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| Self::String(_)
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| Self::Variable(_)
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| Self::Function(_)
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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 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::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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pub(crate) 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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pub(crate) 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, "\"{}\"",
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value.replace("\\", "\\\\").replace("\n", "\\n").replace("\t", "\\t")),
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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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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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