101 lines
1.8 KiB
Rust
101 lines
1.8 KiB
Rust
use nom::
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{
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IResult,
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character::complete::multispace0,
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sequence::{delimited, pair, terminated},
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combinator::map,
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branch::alt,
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bytes::complete::tag,
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};
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fn statement_kind(i: &str) -> IResult<&str, crate::project::StatementKind>
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{
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let foo = delimited
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(
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multispace0,
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alt
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((
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map
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(
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tag("axiom:"),
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|_| crate::project::StatementKind::Axiom,
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),
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map
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(
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tag("lemma:"),
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|_| crate::project::StatementKind::Lemma,
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),
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map
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(
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tag("conjecture:"),
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|_| crate::project::StatementKind::Conjecture,
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),
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)),
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multispace0,
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)(i);
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foo
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}
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fn statement(i: &str) -> IResult<&str, (crate::project::StatementKind, foliage::Formula)>
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{
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terminated
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(
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pair
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(
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statement_kind,
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foliage::formula,
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),
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delimited
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(
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multispace0,
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tag("."),
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multispace0,
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),
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)(i)
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}
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pub fn project(i: &str) -> IResult<&str, crate::Project>
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{
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let mut statement_input = i.clone();
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let mut statements = std::collections::HashMap::new();
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loop
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{
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let i_ = statement_input.clone();
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match statement(i_)
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{
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Ok((i, (statement_kind, formula))) =>
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{
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// Iteration must always consume input (to prevent infinite loops)
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if i == statement_input
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{
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return Err(nom::Err::Error(nom::error::ParseError::from_error_kind(statement_input, nom::error::ErrorKind::Many0)));
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}
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let statements = statements.entry(statement_kind).or_insert_with(Vec::new);
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statements.push(formula);
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statement_input = i;
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},
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Err(nom::Err::Error(_)) => break,
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Err(e) => return Err(e),
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}
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}
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let i = statement_input;
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// Verify that the whole file has been parsed
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if i != ""
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{
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return Err(nom::Err::Error(nom::error::ParseError::from_error_kind(statement_input, nom::error::ErrorKind::Many0)));
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}
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let project = crate::Project
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{
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statements,
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};
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Ok((i, project))
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}
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