organic/trash/text.rs
2023-03-25 12:25:05 -04:00

69 lines
2.1 KiB
Rust

use nom::branch::alt;
use nom::bytes::complete::tag;
use nom::character::complete::alphanumeric1;
use nom::character::complete::line_ending;
use nom::character::complete::space1;
use nom::combinator::map;
use nom::combinator::not;
use nom::combinator::recognize;
use nom::multi::many_till;
use super::bold::bold;
use super::error::Res;
use super::link::link;
use super::parser_with_context::parser_with_context;
use super::token::BlankLine;
use super::token::LineBreak;
use super::token::Space;
use super::token::Span;
use super::token::Symbol;
use super::token::TextElement;
use super::Context;
pub fn line_break(input: &str) -> Res<&str, LineBreak> {
map(line_ending, |s: &str| LineBreak { source: s })(input)
}
pub fn space(input: &str) -> Res<&str, Space> {
map(space1, |s: &str| Space { source: s })(input)
}
fn span(input: &str) -> Res<&str, Span> {
map(alphanumeric1, |s: &str| Span { source: s })(input)
}
pub fn symbol(symbol_tag: &'static str) -> impl for<'a> Fn(&'a str) -> Res<&'a str, Symbol<'a>> {
move |i: &str| map(tag(symbol_tag), |s: &str| Symbol { source: s })(i)
}
/// A line containing only whitespace and then a line break
///
/// It is up to the caller to ensure this is called at the start of a line.
pub fn blank_line(input: &str) -> Res<&str, BlankLine> {
map(
recognize(many_till(
map(space, TextElement::Space),
map(line_break, TextElement::LineBreak),
)),
|contents| BlankLine { source: contents },
)(input)
}
pub fn text_element<'r, 's>(context: Context<'r, 's>, i: &'s str) -> Res<&'s str, TextElement<'s>> {
not(|i| context.check_exit_matcher(i))(i)?;
let bold_matcher = parser_with_context!(bold)(&context);
let link_matcher = parser_with_context!(link)(&context);
alt((
map(bold_matcher, TextElement::Bold),
map(link_matcher, TextElement::Link),
map(span, TextElement::Span),
map(symbol("*"), TextElement::Symbol),
map(symbol("["), TextElement::Symbol),
map(symbol("]"), TextElement::Symbol),
map(space, TextElement::Space),
map(line_break, TextElement::LineBreak),
))(i)
}