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Make variable formatting customizable

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This introduces a Format trait, which can be implemented to customize
the appearance of variable declarations right now. The Format trait will
be extended with further customization options in the future.
This commit is contained in:
Patrick Lühne 2020-04-13 23:18:00 +02:00
parent 9216bbbe31
commit 1e610a77fe
Signed by: patrick
GPG Key ID: 05F3611E97A70ABF
3 changed files with 92 additions and 39 deletions
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19
src/format.rs
View File

@ -1,2 +1,21 @@
mod formulas;
mod terms;
pub trait Format
{
fn display_variable_declaration(&self, formatter: &mut std::fmt::Formatter,
variable_declaration: &std::rc::Rc<crate::VariableDeclaration>)
-> std::fmt::Result;
}
pub struct DefaultFormat;
impl Format for DefaultFormat
{
fn display_variable_declaration(&self, formatter: &mut std::fmt::Formatter,
variable_declaration: &std::rc::Rc<crate::VariableDeclaration>)
-> std::fmt::Result
{
write!(formatter, "{:?}", variable_declaration)
}
}

65
src/format/formulas.rs
View File

@ -35,14 +35,19 @@ enum FormulaPosition
ImpliesAntecedent,
}
struct FormulaDisplay<'formula>
struct FormulaDisplay<'formula, 'format, F>
where
F: super::Format,
{
formula: &'formula crate::Formula,
parent_formula: Option<&'formula crate::Formula>,
position: FormulaPosition,
format: &'format F,
}
impl<'formula> FormulaDisplay<'formula>
impl<'formula, 'format, F> FormulaDisplay<'formula, 'format, F>
where
F: super::Format,
{
fn requires_parentheses(&self) -> bool
{
@ -112,19 +117,24 @@ impl<'formula> FormulaDisplay<'formula>
}
}
fn display_formula<'formula>(formula: &'formula crate::Formula,
parent_formula: Option<&'formula crate::Formula>, position: FormulaPosition)
-> FormulaDisplay<'formula>
fn display_formula<'formula, 'format, F>(formula: &'formula crate::Formula,
parent_formula: Option<&'formula crate::Formula>, position: FormulaPosition, format: &'format F)
-> FormulaDisplay<'formula, 'format, F>
where
F: super::Format,
{
FormulaDisplay
{
formula,
parent_formula,
position,
format,
}
}
impl<'formula> std::fmt::Debug for FormulaDisplay<'formula>
impl<'formula, 'format, F> std::fmt::Debug for FormulaDisplay<'formula, 'format, F>
where
F: super::Format,
{
fn fmt(&self, formatter: &mut std::fmt::Formatter) -> std::fmt::Result
{
@ -142,7 +152,7 @@ impl<'formula> std::fmt::Debug for FormulaDisplay<'formula>
if exists.parameters.is_empty()
{
write!(formatter, "{:?}", display_formula(&exists.argument, self.parent_formula,
self.position))?;
self.position, self.format))?;
}
else
{
@ -152,13 +162,14 @@ impl<'formula> std::fmt::Debug for FormulaDisplay<'formula>
for parameter in exists.parameters.iter()
{
write!(formatter, "{}{:?}", separator, parameter)?;
write!(formatter, "{}", separator)?;
self.format.display_variable_declaration(formatter, &parameter)?;
separator = ", "
}
write!(formatter, " {:?}", display_formula(&exists.argument, Some(self.formula),
FormulaPosition::Any))?;
FormulaPosition::Any, self.format))?;
}
},
crate::Formula::ForAll(for_all) =>
@ -166,7 +177,7 @@ impl<'formula> std::fmt::Debug for FormulaDisplay<'formula>
if for_all.parameters.is_empty()
{
write!(formatter, "{:?}", display_formula(&for_all.argument,
self.parent_formula, self.position))?;
self.parent_formula, self.position, self.format))?;
}
else
{
@ -176,17 +187,18 @@ impl<'formula> std::fmt::Debug for FormulaDisplay<'formula>
for parameter in for_all.parameters.iter()
{
write!(formatter, "{}{:?}", separator, parameter)?;
write!(formatter, "{}", separator)?;
self.format.display_variable_declaration(formatter, &parameter)?;
separator = ", "
}
write!(formatter, " {:?}", display_formula(&for_all.argument,
Some(self.formula), FormulaPosition::Any))?;
Some(self.formula), FormulaPosition::Any, self.format))?;
}
},
crate::Formula::Not(argument) => write!(formatter, "not {:?}",
display_formula(argument, Some(self.formula), FormulaPosition::Any))?,
display_formula(argument, Some(self.formula), FormulaPosition::Any, self.format))?,
crate::Formula::And(arguments) =>
{
if arguments.is_empty()
@ -206,7 +218,7 @@ impl<'formula> std::fmt::Debug for FormulaDisplay<'formula>
for argument in arguments
{
write!(formatter, "{}{:?}", separator,
display_formula(argument, parent_formula, position))?;
display_formula(argument, parent_formula, position, self.format))?;
separator = " and "
}
@ -231,7 +243,7 @@ impl<'formula> std::fmt::Debug for FormulaDisplay<'formula>
for argument in arguments
{
write!(formatter, "{}{:?}", separator,
display_formula(argument, parent_formula, position))?;
display_formula(argument, parent_formula, position, self.format))?;
separator = " or "
}
@ -243,13 +255,14 @@ impl<'formula> std::fmt::Debug for FormulaDisplay<'formula>
{
write!(formatter, "{:?}",
display_formula(antecedent, Some(self.formula),
FormulaPosition::ImpliesAntecedent))
FormulaPosition::ImpliesAntecedent, self.format))
};
let format_implication = |formatter: &mut std::fmt::Formatter| -> Result<_, _>
{
write!(formatter, "{:?}",
display_formula(implication, Some(self.formula), FormulaPosition::Any))
display_formula(implication, Some(self.formula), FormulaPosition::Any,
self.format))
};
match direction
@ -287,7 +300,7 @@ impl<'formula> std::fmt::Debug for FormulaDisplay<'formula>
for argument in arguments
{
write!(formatter, "{}{:?}", separator,
display_formula(argument, parent_formula, position))?;
display_formula(argument, parent_formula, position, self.format))?;
separator = " <-> "
}
@ -306,9 +319,9 @@ impl<'formula> std::fmt::Debug for FormulaDisplay<'formula>
};
write!(formatter, "{:?} {} {:?}",
display_term(&compare.left, None, TermPosition::Any),
display_term(&compare.left, None, TermPosition::Any, self.format),
operator_string,
display_term(&compare.right, None, TermPosition::Any))?;
display_term(&compare.right, None, TermPosition::Any, self.format))?;
},
crate::Formula::Boolean(true) => write!(formatter, "true")?,
crate::Formula::Boolean(false) => write!(formatter, "false")?,
@ -325,7 +338,7 @@ impl<'formula> std::fmt::Debug for FormulaDisplay<'formula>
for argument in &predicate.arguments
{
write!(formatter, "{}{:?}", separator, display_term(argument, None,
TermPosition::Any))?;
TermPosition::Any, self.format))?;
separator = ", "
}
@ -344,7 +357,9 @@ impl<'formula> std::fmt::Debug for FormulaDisplay<'formula>
}
}
impl<'formula> std::fmt::Display for FormulaDisplay<'formula>
impl<'formula, 'format, F> std::fmt::Display for FormulaDisplay<'formula, 'format, F>
where
F: super::Format,
{
fn fmt(&self, formatter: &mut std::fmt::Formatter) -> std::fmt::Result
{
@ -356,7 +371,8 @@ impl std::fmt::Debug for crate::Formula
{
fn fmt(&self, formatter: &mut std::fmt::Formatter) -> std::fmt::Result
{
write!(formatter, "{:?}", display_formula(&self, None, FormulaPosition::Any))
write!(formatter, "{:?}", display_formula(&self, None, FormulaPosition::Any,
&super::DefaultFormat))
}
}
@ -364,7 +380,8 @@ impl std::fmt::Display for crate::Formula
{
fn fmt(&self, formatter: &mut std::fmt::Formatter) -> std::fmt::Result
{
write!(formatter, "{}", display_formula(&self, None, FormulaPosition::Any))
write!(formatter, "{}", display_formula(&self, None, FormulaPosition::Any,
&super::DefaultFormat))
}
}

47
src/format/terms.rs
View File

@ -58,14 +58,19 @@ pub(crate) enum TermPosition
Right,
}
pub(crate) struct TermDisplay<'term>
pub(crate) struct TermDisplay<'term, 'format, F>
where
F: super::Format,
{
term: &'term crate::Term,
parent_term: Option<&'term crate::Term>,
position: TermPosition,
format: &'format F,
}
impl<'term> TermDisplay<'term>
impl<'term, 'format, F> TermDisplay<'term, 'format, F>
where
F: super::Format,
{
fn requires_parentheses(&self) -> bool
{
@ -149,19 +154,24 @@ impl<'term> TermDisplay<'term>
}
}
pub(crate) fn display_term<'term>(term: &'term crate::Term, parent_term: Option<&'term crate::Term>,
position: TermPosition)
-> TermDisplay<'term>
pub(crate) fn display_term<'term, 'format, F>(term: &'term crate::Term,
parent_term: Option<&'term crate::Term>, position: TermPosition, format: &'format F)
-> TermDisplay<'term, 'format, F>
where
F: super::Format,
{
TermDisplay
{
term,
parent_term,
position,
format,
}
}
impl<'term> std::fmt::Debug for TermDisplay<'term>
impl<'term, 'format, F> std::fmt::Debug for TermDisplay<'term, 'format, F>
where
F: super::Format,
{
fn fmt(&self, formatter: &mut std::fmt::Formatter) -> std::fmt::Result
{
@ -180,7 +190,8 @@ impl<'term> std::fmt::Debug for TermDisplay<'term>
crate::Term::Integer(value) => write!(formatter, "{}", value)?,
crate::Term::String(value) => write!(formatter, "\"{}\"",
value.replace("\\", "\\\\").replace("\n", "\\n").replace("\t", "\\t"))?,
crate::Term::Variable(variable) => write!(formatter, "{:?}", variable.declaration)?,
crate::Term::Variable(variable) =>
self.format.display_variable_declaration(formatter, &variable.declaration)?,
crate::Term::Function(function) =>
{
write!(formatter, "{}", function.declaration.name)?;
@ -198,7 +209,8 @@ impl<'term> std::fmt::Debug for TermDisplay<'term>
for argument in &function.arguments
{
write!(formatter, "{}{:?}", separator,
display_term(&argument, Some(self.term), TermPosition::Any))?;
display_term(&argument, Some(self.term), TermPosition::Any,
self.format))?;
separator = ", ";
}
@ -219,18 +231,20 @@ impl<'term> std::fmt::Debug for TermDisplay<'term>
};
write!(formatter, "{:?} {} {:?}",
display_term(&binary_operation.left, Some(self.term), TermPosition::Left),
display_term(&binary_operation.left, Some(self.term), TermPosition::Left,
self.format),
operator_string,
display_term(&binary_operation.right, Some(self.term), TermPosition::Right))?;
display_term(&binary_operation.right, Some(self.term), TermPosition::Right,
self.format))?;
},
crate::Term::UnaryOperation(
crate::UnaryOperation{operator: crate::UnaryOperator::Negative, argument})
=> write!(formatter, "-{:?}",
display_term(argument, Some(self.term), TermPosition::Any))?,
display_term(argument, Some(self.term), TermPosition::Any, self.format))?,
crate::Term::UnaryOperation(
crate::UnaryOperation{operator: crate::UnaryOperator::AbsoluteValue, argument})
=> write!(formatter, "|{:?}|",
display_term(argument, Some(self.term), TermPosition::Any))?,
display_term(argument, Some(self.term), TermPosition::Any, self.format))?,
}
if requires_parentheses
@ -242,7 +256,9 @@ impl<'term> std::fmt::Debug for TermDisplay<'term>
}
}
impl<'term> std::fmt::Display for TermDisplay<'term>
impl<'term, 'format, F> std::fmt::Display for TermDisplay<'term, 'format, F>
where
F: super::Format,
{
fn fmt(&self, formatter: &mut std::fmt::Formatter) -> std::fmt::Result
{
@ -254,7 +270,8 @@ impl std::fmt::Debug for crate::Term
{
fn fmt(&self, formatter: &mut std::fmt::Formatter) -> std::fmt::Result
{
write!(formatter, "{:?}", display_term(&self, None, TermPosition::Any))
write!(formatter, "{:?}", display_term(&self, None, TermPosition::Any,
&super::DefaultFormat))
}
}
@ -262,7 +279,7 @@ impl std::fmt::Display for crate::Term
{
fn fmt(&self, formatter: &mut std::fmt::Formatter) -> std::fmt::Result
{
write!(formatter, "{}", display_term(&self, None, TermPosition::Any))
write!(formatter, "{}", display_term(&self, None, TermPosition::Any, &super::DefaultFormat))
}
}