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Refactor parsing domain specifiers

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This commit is contained in:
Patrick Lühne 2020-05-12 04:51:31 +02:00
parent 222f8b535e
commit e5d8a8a96b
Signed by: patrick
GPG Key ID: 05F3611E97A70ABF
1 changed files with 39 additions and 28 deletions
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67
src/input/specification.rs
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@ -153,6 +153,39 @@ fn formula_statement_body<'i>(input: &'i str, problem: &crate::Problem)
formula(input, problem)
}
fn domain_specifier<'i>(input: &'i str)
-> Result<(Option<crate::Domain>, &'i str), crate::Error>
{
let original_input = input;
let input = input.trim_start();
if input.starts_with("->")
{
let mut input_characters = input.chars();
input_characters.next();
input_characters.next();
let input = input_characters.as_str().trim_start();
let (identifier, remaining_input) =
foliage::parse::tokens::identifier(input)
.ok_or_else(|| crate::Error::new_expected_identifier())?;
let input = remaining_input;
match identifier
{
"integer" => Ok((Some(crate::Domain::Integer), input)),
"program" => Ok((Some(crate::Domain::Program), input)),
_ => return Err(crate::Error::new_unknown_domain_identifier(identifier.to_string())),
}
}
else
{
Ok((None, original_input))
}
}
fn input_statement_body<'i>(mut input: &'i str, problem: &crate::Problem)
-> Result<&'i str, crate::Error>
{
@ -215,35 +248,13 @@ fn input_statement_body<'i>(mut input: &'i str, problem: &crate::Problem)
Some(_)
| None =>
{
let domain =
if input.starts_with("->")
{
let mut input_characters = input.chars();
input_characters.next();
input_characters.next();
let (domain, remaining_input) = match domain_specifier(input)?
{
(Some(domain), remaining_input) => (domain, remaining_input),
(None, remaining_input) => (crate::Domain::Program, remaining_input),
};
input = input_characters.as_str().trim_start();
let (identifier, remaining_input) =
foliage::parse::tokens::identifier(input)
.ok_or_else(|| crate::Error::new_expected_identifier())?;
input = remaining_input;
match identifier
{
"integer" => crate::Domain::Integer,
"program" => crate::Domain::Program,
_ => return Err(crate::Error::new_unknown_domain_identifier(
identifier.to_string())),
}
}
else
{
crate::Domain::Program
};
log::debug!("domain: {:?}", domain);
input = remaining_input;
let mut input_constant_declarations =
problem.input_constant_declarations.borrow_mut();