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use std::cell::RefCell;
use winnow::combinator::cut_err;
use winnow::combinator::eof;
use winnow::combinator::opt;
use winnow::combinator::peek;
use winnow::combinator::repeat;
use winnow::token::any;
use winnow::token::one_of;
use winnow::trace::trace;
use crate::document::Document;
use crate::key::Key;
use crate::parser::inline_table::KEYVAL_SEP;
use crate::parser::key::key;
use crate::parser::prelude::*;
use crate::parser::state::ParseState;
use crate::parser::table::table;
use crate::parser::trivia::{comment, line_ending, line_trailing, newline, ws};
use crate::parser::value::value;
use crate::table::TableKeyValue;
use crate::Item;
use crate::RawString;
// ;; TOML
// toml = expression *( newline expression )
// expression = ( ( ws comment ) /
// ( ws keyval ws [ comment ] ) /
// ( ws table ws [ comment ] ) /
// ws )
pub(crate) fn document(input: &mut Input<'_>) -> PResult<Document> {
let state = RefCell::new(ParseState::default());
let state_ref = &state;
let _o = (
// Remove BOM if present
opt(b"\xEF\xBB\xBF"),
parse_ws(state_ref),
repeat(0.., (
dispatch! {peek(any);
crate::parser::trivia::COMMENT_START_SYMBOL => cut_err(parse_comment(state_ref)),
crate::parser::table::STD_TABLE_OPEN => cut_err(table(state_ref)),
crate::parser::trivia::LF |
crate::parser::trivia::CR => parse_newline(state_ref),
_ => cut_err(keyval(state_ref)),
},
parse_ws(state_ref),
))
.map(|()| ()),
eof,
)
.parse_next(input)?;
state.into_inner().into_document().map_err(|err| {
winnow::error::ErrMode::from_external_error(input, winnow::error::ErrorKind::Verify, err)
})
}
pub(crate) fn parse_comment<'s, 'i>(
state: &'s RefCell<ParseState>,
) -> impl Parser<Input<'i>, (), ContextError> + 's {
move |i: &mut Input<'i>| {
(comment, line_ending)
.span()
.map(|span| {
state.borrow_mut().on_comment(span);
})
.parse_next(i)
}
}
pub(crate) fn parse_ws<'s, 'i>(
state: &'s RefCell<ParseState>,
) -> impl Parser<Input<'i>, (), ContextError> + 's {
move |i: &mut Input<'i>| {
ws.span()
.map(|span| state.borrow_mut().on_ws(span))
.parse_next(i)
}
}
pub(crate) fn parse_newline<'s, 'i>(
state: &'s RefCell<ParseState>,
) -> impl Parser<Input<'i>, (), ContextError> + 's {
move |i: &mut Input<'i>| {
newline
.span()
.map(|span| state.borrow_mut().on_ws(span))
.parse_next(i)
}
}
pub(crate) fn keyval<'s, 'i>(
state: &'s RefCell<ParseState>,
) -> impl Parser<Input<'i>, (), ContextError> + 's {
move |i: &mut Input<'i>| {
parse_keyval
.try_map(|(p, kv)| state.borrow_mut().on_keyval(p, kv))
.parse_next(i)
}
}
// keyval = key keyval-sep val
pub(crate) fn parse_keyval(input: &mut Input<'_>) -> PResult<(Vec<Key>, TableKeyValue)> {
trace(
"keyval",
(
key,
cut_err((
one_of(KEYVAL_SEP)
.context(StrContext::Expected(StrContextValue::CharLiteral('.')))
.context(StrContext::Expected(StrContextValue::CharLiteral('='))),
(
ws.span(),
value(RecursionCheck::default()),
line_trailing
.context(StrContext::Expected(StrContextValue::CharLiteral('\n')))
.context(StrContext::Expected(StrContextValue::CharLiteral('#'))),
),
)),
)
.try_map::<_, _, std::str::Utf8Error>(|(key, (_, v))| {
let mut path = key;
let key = path.pop().expect("grammar ensures at least 1");
let (pre, v, suf) = v;
let pre = RawString::with_span(pre);
let suf = RawString::with_span(suf);
let v = v.decorated(pre, suf);
Ok((
path,
TableKeyValue {
key,
value: Item::Value(v),
},
))
}),
)
.parse_next(input)
}
|
