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/*
* parsing/rule/impls/raw.rs
*
* ftml - Library to parse Wikidot text
* Copyright (C) 2019-2026 Wikijump Team
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
use super::prelude::*;
macro_rules! raw {
($value:expr) => {
Element::Raw(cow!($value))
};
}
pub const RULE_RAW: Rule = Rule {
name: "raw",
position: LineRequirement::Any,
try_consume_fn,
};
fn try_consume_fn<'r, 't>(
parser: &mut Parser<'r, 't>,
) -> ParseResult<'r, 't, Elements<'t>> {
debug!("Consuming tokens until end of raw");
// Are we in a @@..@@ type raw, or a @<..>@ type?
let ending_token = match parser.current().token {
Token::Raw => Token::Raw,
Token::LeftRaw => Token::RightRaw,
_ => panic!("Current token is not a starting raw"),
};
// Check for four special cases:
// * Raw Raw "@" -> Element::Raw("@")
// * Raw Raw !Raw -> Element::Raw("")
// * Raw Raw Raw -> Element::Raw("@@")
// * Raw ?? Raw -> Element::Raw(slice)
if ending_token == Token::Raw {
trace!("First token is '@@', checking for special cases");
// Get next two tokens. If they don't exist, exit early
let next_1 = parser.look_ahead_err(0)?;
let next_2 = parser.look_ahead_err(1)?;
// Determine which case they fall under
match (next_1.token, next_2.token) {
// "@@@@@@" -> Element::Raw("@@")
(Token::Raw, Token::Raw) => {
trace!("Found meta-raw (\"@@@@@@\"), returning");
parser.step_n(3)?;
return ok!(raw!("@@"));
}
// "@@@@@" -> Element::Raw("@")
// This case is strange since the lexer returns Raw Raw Other (@@ @@ @)
// So we capture this and return the intended output
(Token::Raw, Token::Other) => {
if next_2.slice == "@" {
trace!("Found single-raw (\"@@@@@\"), returning");
parser.step_n(3)?;
return ok!(raw!("@"));
} else {
trace!("Found empty raw (\"@@@@\"), followed by other text");
parser.step_n(2)?;
return ok!(raw!(""));
}
}
// "@@@@" -> Element::Raw("")
// Only consumes two tokens.
(Token::Raw, _) => {
trace!("Found empty raw (\"@@@@\"), returning");
parser.step_n(2)?;
return ok!(raw!(""));
}
// "@@ \n @@" -> Abort
(Token::LineBreak, Token::Raw) | (Token::ParagraphBreak, Token::Raw) => {
trace!("Found interrupted raw, aborting");
return Err(parser.make_err(ParseErrorKind::RuleFailed));
}
// "@@ [something] @@" -> Element::Raw(token)
(_, Token::Raw) => {
trace!("Found single-element raw, returning");
parser.step_n(3)?;
return ok!(raw!(next_1.slice));
}
// Other, proceed with rule logic
(_, _) => (),
}
}
// Handle the other cases, which are:
// * "@@ [tokens] @@"
// * "@< [tokens] >@"
//
// Collect the first and last token to build a slice of its contents.
// The last will be updated with each step in the iterator.
let (start, mut end) = {
let current = parser.step()?;
(current, current)
};
loop {
let ExtractedToken {
token,
slice: _slice,
span: _span,
} = parser.current();
trace!("Received token '{}' inside raw", token.name());
// Check token
match token {
// Possibly hit end of raw. If not, continue.
Token::RightRaw | Token::Raw => {
// If block is inside match rule for clarity
if *token == ending_token {
trace!("Reached end of raw, returning");
let slice = parser.full_text().slice_partial(start, end);
parser.step()?;
let element = Element::Raw(cow!(slice));
return ok!(element);
}
trace!("Wasn't end of raw, continuing");
}
// Hit a newline, abort
Token::LineBreak | Token::ParagraphBreak => {
trace!("Reached newline, aborting");
return Err(parser.make_err(ParseErrorKind::RuleFailed));
}
// Hit the end of the input, abort
Token::InputEnd => {
trace!("Reached end of input, aborting");
return Err(parser.make_err(ParseErrorKind::EndOfInput));
}
// No special handling, append to slices like normal
_ => (),
}
trace!("Appending present token to raw");
// Update last token and step.
end = parser.step()?;
}
}