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Add Multi-Invokation 👨‍👩‍👧‍👧

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This commit is contained in:
Martin Haug 2020-08-27 17:50:57 +02:00
parent 141d69cb60
commit 3de20f8d38
2 changed files with 87 additions and 20 deletions
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93
src/syntax/parsing.rs
View File

@ -67,7 +67,7 @@ impl Parser<'_> {
}
Token::LeftBracket => {
self.parse_bracket_call().map(|c| SyntaxNode::Call(c))
self.parse_bracket_call(false).map(|c| SyntaxNode::Call(c))
}
Token::Star => self.with_span(SyntaxNode::ToggleBolder),
@ -111,11 +111,15 @@ impl Parser<'_> {
// Function calls.
impl Parser<'_> {
fn parse_bracket_call(&mut self) -> Spanned<CallExpr> {
self.start_group(Delimiter::Bracket);
self.tokens.push_mode(TokenMode::Header);
fn parse_bracket_call(&mut self, chained: bool) -> Spanned<CallExpr> {
let before_bracket = self.pos();
if !chained {
self.start_group(Delimiter::Bracket);
self.tokens.push_mode(TokenMode::Header);
}
let after_bracket = self.pos();
self.start_group(Delimiter::Subheader);
self.skip_white();
let name = self.parse_ident().unwrap_or_else(|| {
self.expected_found_or_at("function name", after_bracket);
@ -123,8 +127,12 @@ impl Parser<'_> {
});
self.skip_white();
let mut last_was_chain = false;
let mut args = match self.eatv() {
Some(Token::Colon) => self.parse_table_contents().0,
Some(Token::Colon) => {
self.parse_table_contents().0
},
Some(_) => {
self.expected_at("colon", name.span.end);
while self.eat().is_some() {}
@ -133,10 +141,30 @@ impl Parser<'_> {
None => TableExpr::new(),
};
self.tokens.pop_mode();
let mut span = self.end_group();
self.end_group();
self.skip_white();
if self.peek().is_some() {
last_was_chain = true;
let item = self.parse_bracket_call(true);
let span = item.span;
let t = vec![item.map(|f| SyntaxNode::Call(f))];
args.push(SpannedEntry::val(Spanned::new(Expr::Tree(t), span)));
}
if self.check(Token::LeftBracket) {
let end = if !last_was_chain {
self.tokens.pop_mode();
self.end_group().end
} else {
args.last()
.expect("last_was_chain set, call expected")
.1.val.span.end
};
let start = if chained { after_bracket } else { before_bracket };
let mut span = Span::new(start, end);
if self.check(Token::LeftBracket) && !last_was_chain {
self.start_group(Delimiter::Bracket);
self.tokens.push_mode(TokenMode::Body);
@ -358,7 +386,7 @@ impl Parser<'_> {
// This is a bracketed function call.
Token::LeftBracket => {
let call = self.parse_bracket_call();
let call = self.parse_bracket_call(false);
let tree = vec![call.map(|c| SyntaxNode::Call(c))];
Spanned::new(Expr::Tree(tree), span)
}
@ -415,12 +443,18 @@ impl Parser<'_> {
impl<'s> Parser<'s> {
fn start_group(&mut self, delimiter: Delimiter) {
let start = self.pos();
self.assert(delimiter.start());
if let Some(start_token) = delimiter.start() {
self.assert(start_token);
}
self.delimiters.push((start, delimiter.end()));
}
fn end_group(&mut self) -> Span {
assert_eq!(self.peek(), None, "unfinished group");
if self.delimiters.last()
.expect("group was not started").1 != Token::FunctionLink {
assert_eq!(self.peek(), None, "unfinished group");
}
let (start, end_token) = self.delimiters.pop()
.expect("group was not started");
@ -431,10 +465,12 @@ impl<'s> Parser<'s> {
}
_ => {
let end = self.pos();
error!(
@self.feedback, Span::at(end),
"expected {}", end_token.name(),
);
if end_token != Token::FunctionLink {
error!(
@self.feedback, Span::at(end),
"expected {}", end_token.name(),
);
}
Span::new(start, end)
}
}
@ -471,6 +507,7 @@ impl<'s> Parser<'s> {
}
}
/// Checks if the next token is of some kind
fn check(&mut self, token: Token<'_>) -> bool {
self.peekv() == Some(token)
}
@ -517,21 +554,24 @@ enum Delimiter {
Paren,
Bracket,
Brace,
Subheader,
}
impl Delimiter {
fn is_delimiter(token: Token<'_>) -> bool {
matches!(
token,
Token::RightParen | Token::RightBracket | Token::RightBrace
Token::RightParen | Token::RightBracket
| Token::RightBrace | Token::FunctionLink
)
}
fn start(self) -> Token<'static> {
fn start(self) -> Option<Token<'static>> {
match self {
Self::Paren => Token::LeftParen,
Self::Bracket => Token::LeftBracket,
Self::Brace => Token::LeftBrace,
Self::Paren => Some(Token::LeftParen),
Self::Bracket => Some(Token::LeftBracket),
Self::Brace => Some(Token::LeftBrace),
Self::Subheader => None,
}
}
@ -540,6 +580,7 @@ impl Delimiter {
Self::Paren => Token::RightParen,
Self::Bracket => Token::RightBracket,
Self::Brace => Token::RightBrace,
Self::Subheader => Token::FunctionLink,
}
}
}
@ -837,6 +878,18 @@ mod tests {
e!("[ 🌎]" => s(0,3, 0,4, "expected function name, found invalid token"));
}
#[test]
fn test_parse_subgroups() {
// Things the parser has to make sense of
t!("[hi: (5.0, 2.1 >> you]" => P![F!("hi"; Table![Num(5.0), Num(2.1)], Tree![F!("you")])]);
t!("[bold: 400, >> emph >> sub: 1cm]" => P![F!("bold"; Num(400.0), Tree![F!("emph"; Tree!(F!("sub"; Len(Length::cm(1.0)))))])]);
t!("[box >> pad: 1pt][Hi]" => P![F!("box"; Tree![F!("pad"; Len(Length::pt(1.0)), Tree!(P![T("Hi")]))])]);
// Errors for unclosed / empty predecessor groups
e!("[hi: (5.0, 2.1 >> you]" => s(0, 15, 0, 15, "expected closing paren"));
e!("[>> abc]" => s(0, 1, 0, 1, "expected function name"));
}
#[test]
fn test_parse_colon_starting_func_args() {
// Just colon without args.

14
src/syntax/tokens.rs
View File

@ -34,6 +34,8 @@ pub enum Token<'s> {
LeftBrace,
/// A right brace in a function header: `}`.
RightBrace,
/// A double forward chevron in a function header: `>>`.
FunctionLink,
/// A colon in a function header: `:`.
Colon,
@ -108,6 +110,7 @@ impl<'s> Token<'s> {
RightParen => "closing paren",
LeftBrace => "opening brace",
RightBrace => "closing brace",
FunctionLink => "function chain operator",
Colon => "colon",
Comma => "comma",
Equals => "equals sign",
@ -218,6 +221,8 @@ impl<'s> Iterator for Tokens<'s> {
':' if self.mode == Header => Colon,
',' if self.mode == Header => Comma,
'=' if self.mode == Header => Equals,
'>' if self.mode == Header && self.peek() == Some('>') =>
self.read_function_chain(),
// Expression operators.
'+' if self.mode == Header => Plus,
@ -308,6 +313,12 @@ impl<'s> Tokens<'s> {
}, true, 0, -2).0)
}
fn read_function_chain(&mut self) -> Token<'s> {
let second = self.eat();
debug_assert!(second == Some('>'));
FunctionLink
}
fn read_whitespace(&mut self, start: Pos) -> Token<'s> {
self.read_string_until(|n| !n.is_whitespace(), false, 0, 0);
let end = self.pos();
@ -490,6 +501,7 @@ mod tests {
LeftBracket as L, RightBracket as R,
LeftParen as LP, RightParen as RP,
LeftBrace as LB, RightBrace as RB,
FunctionLink,
Ident as Id,
Bool,
Number as Num,
@ -576,8 +588,10 @@ mod tests {
t!(Header, "120%" => Num(1.2));
t!(Header, "12e4%" => Num(1200.0));
t!(Header, "__main__" => Id("__main__"));
t!(Header, ">main" => Invalid(">main"));
t!(Header, ".func.box" => Id(".func.box"));
t!(Header, "arg, _b, _1" => Id("arg"), Comma, S(0), Id("_b"), Comma, S(0), Id("_1"));
t!(Header, "f: arg >> g" => Id("f"), Colon, S(0), Id("arg"), S(0), FunctionLink, S(0), Id("g"));
t!(Header, "12_pt, 12pt" => Invalid("12_pt"), Comma, S(0), Len(Length::pt(12.0)));
t!(Header, "1e5in" => Len(Length::inches(100000.0)));
t!(Header, "2.3cm" => Len(Length::cm(2.3)));