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83 lines
3.1 KiB
Rust
83 lines
3.1 KiB
Rust
use nom::combinator::not;
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use nom::combinator::recognize;
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use super::object::PlainText;
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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::object_parser::any_object_except_plain_text;
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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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#[tracing::instrument(ret, level = "debug")]
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pub fn plain_text<'r, 's>(context: Context<'r, 's>, input: &'s str) -> Res<&'s str, PlainText<'s>> {
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if input.len() == 0 {
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return Err(nom::Err::Error(CustomError::MyError(MyError(
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"Zero input length to plain_text.",
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))));
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}
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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: &plain_text_end,
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}));
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let mut current_input = input.char_indices();
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loop {
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match current_input.next() {
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Some((offset, _char)) => {
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let remaining = &input[offset..];
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let exit_matcher_status = not(|i| parser_context.check_exit_matcher(i))(remaining);
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if exit_matcher_status.is_err() {
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if offset == 0 {
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// If we're at the start of the input, then nothing is plain text, so fire an error for zero-length match.
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exit_matcher_status?;
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} else {
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return Ok((
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&input[offset..],
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PlainText {
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source: &input[..offset],
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},
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));
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}
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}
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}
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None => {
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// We hit the end of the file, so all input must be plain text
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return Ok((&input[input.len()..], PlainText { source: input }));
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}
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};
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}
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}
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#[tracing::instrument(ret, level = "debug")]
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fn plain_text_end<'r, 's>(context: Context<'r, 's>, input: &'s str) -> Res<&'s str, &'s str> {
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recognize(parser_with_context!(any_object_except_plain_text)(context))(input)
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}
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#[cfg(test)]
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mod tests {
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use nom::combinator::map;
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use super::*;
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use crate::parser::object::Object;
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use crate::parser::parser_context::ContextElement;
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use crate::parser::parser_context::ContextTree;
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use crate::parser::parser_with_context::parser_with_context;
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use crate::parser::source::Source;
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#[test]
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fn plain_text_simple() {
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let input = "foobarbaz";
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let initial_context: ContextTree<'_, '_> = ContextTree::new();
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let document_context =
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initial_context.with_additional_node(ContextElement::DocumentRoot(input));
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let plain_text_matcher = parser_with_context!(plain_text)(&document_context);
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let (remaining, result) = map(plain_text_matcher, Object::PlainText)(input).unwrap();
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assert_eq!(remaining, "");
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assert_eq!(result.get_source(), input);
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}
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}
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