61 lines
2.2 KiB
Rust
61 lines
2.2 KiB
Rust
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use nom::bytes::complete::tag;
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use nom::character::complete::anychar;
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use nom::character::complete::one_of;
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use nom::character::complete::space0;
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use nom::combinator::peek;
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use nom::combinator::recognize;
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use nom::combinator::verify;
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use nom::multi::many_till;
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use super::Context;
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use crate::error::CustomError;
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use crate::error::MyError;
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use crate::error::Res;
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use crate::parser::exiting::ExitClass;
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use crate::parser::parser_context::ContextElement;
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use crate::parser::parser_context::ExitMatcherNode;
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use crate::parser::parser_with_context::parser_with_context;
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use crate::parser::util::exit_matcher_parser;
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use crate::parser::util::get_consumed;
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use crate::parser::util::get_one_before;
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use crate::parser::Target;
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#[tracing::instrument(ret, level = "debug")]
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pub fn target<'r, 's>(context: Context<'r, 's>, input: &'s str) -> Res<&'s str, Target<'s>> {
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let (remaining, _) = tag("<<")(input)?;
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let (remaining, _) = peek(verify(anychar, |c| {
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!c.is_whitespace() && !"<>\n".contains(*c)
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}))(remaining)?;
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let parser_context =
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context.with_additional_node(ContextElement::ExitMatcherNode(ExitMatcherNode {
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class: ExitClass::Beta,
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exit_matcher: &target_end,
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}));
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let (remaining, body) = recognize(many_till(
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anychar,
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parser_with_context!(exit_matcher_parser)(&parser_context),
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))(remaining)?;
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let document_root = context.get_document_root().unwrap();
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let preceding_character = get_one_before(document_root, remaining)
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.map(|slice| slice.chars().next())
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.flatten()
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.expect("We cannot be at the start of the file because we are inside a target.");
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if preceding_character.is_whitespace() {
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return Err(nom::Err::Error(CustomError::MyError(MyError(
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"Targets cannot end with whitespace.",
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))));
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}
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let (remaining, _) = tag(">>")(remaining)?;
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let (remaining, _) = space0(remaining)?;
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let source = get_consumed(input, remaining);
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Ok((remaining, Target { source }))
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}
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#[tracing::instrument(ret, level = "debug")]
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fn target_end<'r, 's>(context: Context<'r, 's>, input: &'s str) -> Res<&'s str, &'s str> {
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recognize(one_of("<>\n"))(input)
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}
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