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use std::fmt::Display;
use crate::{
first_pass,
misc::{Pos, Span},
};
#[derive(Debug, PartialEq, Eq)]
pub struct Block
{
pub kind: Vec<char>,
pub content: Text,
}
#[derive(Debug, PartialEq, Eq)]
pub enum TextPiece
{
Text(Vec<char>),
Literal(Vec<char>),
Block(Block),
CommandHeader(Vec<char>),
Braces(Text),
Comment,
}
#[derive(Debug, PartialEq, Eq)]
pub struct Text
{
pub pieces: Vec<(TextPiece, Span)>,
}
// Fixing this would make it less clear, not more.
#[allow(clippy::too_many_lines)]
pub fn parse(unparsed: &[(first_pass::TextPiece, Span)]) -> Text
{
let mut pieces = vec![];
let mut i = 0;
while unparsed[i].0 != first_pass::TextPiece::End
{
match &unparsed[i].0
{
first_pass::TextPiece::Literal(literal) =>
{
pieces.push((TextPiece::Literal(literal.clone()), unparsed[i].1));
}
first_pass::TextPiece::Text(c) =>
{
let mut text = vec![*c];
let start = unparsed[i].1;
i += 1;
while let first_pass::TextPiece::Text(c) = unparsed[i].0
{
text.push(c);
i += 1;
}
i -= 1;
pieces.push((
TextPiece::Text(text),
Span {
start: start.start,
end: unparsed[i].1.end,
},
));
}
command if command.is_begin() =>
{
i += 1;
if let first_pass::TextPiece::Braces(kind) = &unparsed[i].0
{
let mut counter = 1;
let mut inner = vec![];
i += 1;
while counter > 0
{
inner.push(unparsed[i].clone());
if unparsed[i].0.is_begin()
{
counter += 1;
}
else if unparsed[i].0.is_end()
{
counter -= 1;
}
i += 1;
}
inner.pop();
inner.extend(vec![
(
first_pass::TextPiece::End,
Span {
start: Pos::default(),
end: Pos::default()
}
);
10
]);
assert!(
unparsed[i].0.does_kind_match(kind),
"Wrong \\end at from {}, {} to {}, {}.",
unparsed[i].1.start.line,
unparsed[i].1.start.column,
unparsed[i].1.end.line,
unparsed[i].1.end.column,
);
let span = Span {
start: inner[0].1.start,
end: inner[inner.len() - 11].1.end,
};
pieces.push((
TextPiece::Block(Block {
kind: kind.to_owned(),
content: parse(&inner),
}),
span,
));
}
else
{
panic!(
"\\begin needs {{…}} afterwards at from {}, {} to {}, {}.",
unparsed[i].1.start.line,
unparsed[i].1.start.column,
unparsed[i].1.end.line,
unparsed[i].1.end.column,
);
}
}
first_pass::TextPiece::CommandHeader(command) =>
{
pieces.push((TextPiece::CommandHeader(command.clone()), unparsed[i].1));
}
first_pass::TextPiece::Braces(braces) =>
{
let first_pass::Text { pieces: first } = first_pass::parse(braces);
pieces.push((TextPiece::Braces(parse(&first)), unparsed[i].1));
}
first_pass::TextPiece::Comment => pieces.push((TextPiece::Comment, unparsed[i].1)),
first_pass::TextPiece::End => break,
}
i += 1;
}
Text { pieces }
}
impl Display for Text
{
fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result
{
for piece in &self.pieces
{
match &piece.0
{
TextPiece::Text(s) | TextPiece::Literal(s) => write!(f, "{}", s.iter().collect::<String>())?,
TextPiece::Block(Block { kind, content }) => write!(
f,
"\\begin{{{}}}{}\\end{{{}}}",
kind.iter().collect::<String>(),
content,
kind.iter().collect::<String>()
)?,
TextPiece::CommandHeader(s) => write!(f, "\\{}", s.iter().collect::<String>())?,
TextPiece::Braces(s) => write!(f, "{{{s}}}")?,
TextPiece::Comment => writeln!(f, "%")?,
}
}
Ok(())
}
}
#[cfg(test)]
mod tests
{
use crate::{
first_pass::TextPiece as FirstTextPiece,
misc::{Pos, Span},
second_pass::{parse, Block, Text, TextPiece},
};
// Test just often are long, it wouldn't be better to split this
// into multiple functions. Also pedantic lint.
#[allow(clippy::too_many_lines)]
#[test]
fn second_pass_test()
{
// This is a default span used in tests where spans aren't
// actually the thing I want to test and so would just take up
// space.
let span = Span {
start: Pos { line: 564, column: 124 },
end: Pos { line: 234, column: 876 },
};
let tests = vec![
(
vec![(
FirstTextPiece::End,
Span {
start: Pos { line: 0, column: 0 },
end: Pos { line: 0, column: 0 },
},
)],
Text { pieces: vec![] },
),
(
vec![
(
FirstTextPiece::Literal(vec![]),
Span {
start: Pos { line: 0, column: 0 },
end: Pos { line: 0, column: 0 },
},
),
(
FirstTextPiece::End,
Span {
start: Pos { line: 0, column: 0 },
end: Pos { line: 0, column: 0 },
},
),
],
Text {
pieces: vec![(
TextPiece::Literal(vec![]),
Span {
start: Pos { line: 0, column: 0 },
end: Pos { line: 0, column: 0 },
},
)],
},
),
(
vec![
(
FirstTextPiece::Literal(vec!['a', 'b', 'c', 'ä']),
Span {
start: Pos { line: 0, column: 0 },
end: Pos { line: 0, column: 4 },
},
),
(
FirstTextPiece::End,
Span {
start: Pos { line: 0, column: 4 },
end: Pos { line: 0, column: 4 },
},
),
],
Text {
pieces: vec![(
TextPiece::Literal(vec!['a', 'b', 'c', 'ä']),
Span {
start: Pos { line: 0, column: 0 },
end: Pos { line: 0, column: 4 },
},
)],
},
),
(
vec![
(FirstTextPiece::CommandHeader(vec!['b', 'e', 'g', 'i', 'n']), span),
(FirstTextPiece::Braces(vec!['a', 'l', 'i', 'g', 'n']), span),
(FirstTextPiece::Literal(vec!['a', 'b', 'c', 'ä']), span),
(FirstTextPiece::CommandHeader(vec!['e', 'n', 'd']), span),
(FirstTextPiece::Braces(vec!['a', 'l', 'i', 'g', 'n']), span),
(FirstTextPiece::End, span),
],
Text {
pieces: vec![(
TextPiece::Block(Block {
kind: vec!['a', 'l', 'i', 'g', 'n'],
content: Text {
pieces: vec![(TextPiece::Literal(vec!['a', 'b', 'c', 'ä']), span)],
},
}),
span,
)],
},
),
(
vec![
(FirstTextPiece::Literal(vec!['Ä', 'Ö', 'Ü']), span),
(FirstTextPiece::CommandHeader(vec!['b', 'e', 'g', 'i', 'n']), span),
(FirstTextPiece::Braces(vec!['a', 'l', 'i', 'g', 'n']), span),
(FirstTextPiece::Literal(vec!['a', 'b', 'c', 'ä']), span),
(FirstTextPiece::CommandHeader(vec!['e', 'n', 'd']), span),
(FirstTextPiece::Braces(vec!['a', 'l', 'i', 'g', 'n']), span),
(FirstTextPiece::End, span),
],
Text {
pieces: vec![
(TextPiece::Literal(vec!['Ä', 'Ö', 'Ü']), span),
(
TextPiece::Block(Block {
kind: vec!['a', 'l', 'i', 'g', 'n'],
content: Text {
pieces: vec![(TextPiece::Literal(vec!['a', 'b', 'c', 'ä']), span)],
},
}),
span,
),
],
},
),
(
vec![
(FirstTextPiece::Literal(vec!['Ä', 'Ö', 'Ü']), span),
(FirstTextPiece::CommandHeader(vec!['b', 'e', 'g', 'i', 'n']), span),
(FirstTextPiece::Braces(vec!['a', 'l', 'i', 'g', 'n']), span),
(FirstTextPiece::CommandHeader(vec!['n', 'w', 's']), span),
(FirstTextPiece::Literal(vec!['a', 'b', 'c', 'ä']), span),
(FirstTextPiece::CommandHeader(vec!['e', 'n', 'd']), span),
(FirstTextPiece::Braces(vec!['a', 'l', 'i', 'g', 'n']), span),
(FirstTextPiece::End, span),
],
Text {
pieces: vec![
(TextPiece::Literal(vec!['Ä', 'Ö', 'Ü']), span),
(
TextPiece::Block(Block {
kind: vec!['a', 'l', 'i', 'g', 'n'],
content: Text {
pieces: vec![
(TextPiece::CommandHeader(vec!['n', 'w', 's']), span),
(TextPiece::Literal(vec!['a', 'b', 'c', 'ä']), span),
],
},
}),
span,
),
],
},
),
];
for (input, output) in tests
{
assert_eq!(parse(&input), output);
}
}
}