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//! To do.
use crate::constant::{LIST_ITEM_VALUE_SIZE_MAX, TAB_SIZE};
use crate::construct::partial_space_or_tab::space_or_tab_min_max;
use crate::token::Token;
use crate::tokenizer::{Code, State, StateFnResult, Tokenizer};
/// Type of title.
#[derive(Debug, PartialEq)]
enum Kind {
/// In a dot (`.`) list.
///
/// ## Example
///
/// ```markdown
/// 1. a
/// ```
Dot,
/// In a paren (`)`) list.
///
/// ## Example
///
/// ```markdown
/// 1) a
/// ```
Paren,
/// In an asterisk (`*`) list.
///
/// ## Example
///
/// ```markdown
/// * a
/// ```
Asterisk,
/// In a plus (`+`) list.
///
/// ## Example
///
/// ```markdown
/// + a
/// ```
Plus,
/// In a dash (`-`) list.
///
/// ## Example
///
/// ```markdown
/// - a
/// ```
Dash,
}
impl Kind {
/// Turn the kind into a [char].
fn as_char(&self) -> char {
match self {
Kind::Dot => '.',
Kind::Paren => ')',
Kind::Asterisk => '*',
Kind::Plus => '+',
Kind::Dash => '-',
}
}
/// Turn a [char] into a kind.
///
/// ## Panics
///
/// Panics if `char` is not `.`, `)`, `*`, `+`, or `-`.
fn from_char(char: char) -> Kind {
match char {
'.' => Kind::Dot,
')' => Kind::Paren,
'*' => Kind::Asterisk,
'+' => Kind::Plus,
'-' => Kind::Dash,
_ => unreachable!("invalid char"),
}
}
/// Turn [Code] into a kind.
///
/// ## Panics
///
/// Panics if `code` is not `Code::Char('.' | ')' | '*' | '+' | '-')`.
fn from_code(code: Code) -> Kind {
match code {
Code::Char(char) => Kind::from_char(char),
_ => unreachable!("invalid code"),
}
}
}
/// To do.
pub fn start(tokenizer: &mut Tokenizer, code: Code) -> StateFnResult {
// To do: allow arbitrary when code (indented) is turned off.
tokenizer.go(space_or_tab_min_max(0, TAB_SIZE - 1), before)(tokenizer, code)
}
/// To do.
fn before(tokenizer: &mut Tokenizer, code: Code) -> StateFnResult {
match code {
// Unordered.
Code::Char('*' | '+' | '-') => {
// To do: check if this is a thematic break?
tokenizer.enter(Token::List);
tokenizer.enter(Token::ListItemPrefix);
marker(tokenizer, code)
}
// Ordered.
Code::Char(char) if char.is_ascii_digit() => {
tokenizer.enter(Token::List);
tokenizer.enter(Token::ListItemPrefix);
tokenizer.enter(Token::ListItemValue);
// To do: `interrupt || !1`?
inside(tokenizer, code, 0)
}
_ => (State::Nok, None),
}
}
/// To do.
fn inside(tokenizer: &mut Tokenizer, code: Code, mut size: usize) -> StateFnResult {
match code {
Code::Char(char) if char.is_ascii_digit() && size < LIST_ITEM_VALUE_SIZE_MAX => {
tokenizer.consume(code);
size += 1;
(State::Fn(Box::new(move |t, c| inside(t, c, size))), None)
}
// To do: `(!self.interrupt || size < 2)`
Code::Char('.' | ')') => {
tokenizer.exit(Token::ListItemValue);
marker(tokenizer, code)
}
_ => (State::Nok, None),
}
}
/// To do.
fn marker(tokenizer: &mut Tokenizer, code: Code) -> StateFnResult {
let kind = Kind::from_code(code);
println!("list item kind: {:?}", kind);
tokenizer.enter(Token::ListItemMarker);
tokenizer.consume(code);
tokenizer.exit(Token::ListItemMarker);
// To do: check blank line, if true `State::Nok` else `on_blank`.
(State::Fn(Box::new(marker_after)), None)
}
/// To do.
fn marker_after(tokenizer: &mut Tokenizer, code: Code) -> StateFnResult {
tokenizer.attempt(list_item_prefix_whitespace, |ok| {
let func = if ok { prefix_end } else { prefix_other };
Box::new(func)
})(tokenizer, code)
}
// To do: `on_blank`.
/// To do.
fn prefix_other(tokenizer: &mut Tokenizer, code: Code) -> StateFnResult {
match code {
Code::VirtualSpace | Code::Char('\t' | ' ') => {
tokenizer.enter(Token::SpaceOrTab);
tokenizer.consume(code);
tokenizer.exit(Token::SpaceOrTab);
(State::Fn(Box::new(prefix_end)), None)
}
_ => (State::Nok, None),
}
}
/// To do.
fn prefix_end(tokenizer: &mut Tokenizer, code: Code) -> StateFnResult {
// To do: calculate size.
tokenizer.exit(Token::ListItemPrefix);
(State::Ok, Some(vec![code]))
}
/// To do.
fn list_item_prefix_whitespace(tokenizer: &mut Tokenizer, code: Code) -> StateFnResult {
// To do: check how big this should be?
tokenizer.go(
space_or_tab_min_max(1, TAB_SIZE - 1),
list_item_prefix_whitespace_after,
)(tokenizer, code)
}
fn list_item_prefix_whitespace_after(_tokenizer: &mut Tokenizer, code: Code) -> StateFnResult {
// To do: check some stuff?
(State::Ok, Some(vec![code]))
}
/// End of a block quote.
pub fn end() -> Vec<Token> {
vec![Token::List]
}
|
