Refresh function call and dictionary syntax

- No colon between function name and arguments, just whitespace
- "Named" arguments (previously "keyword" arguments) use colon instead of equals sign

27 files changed, 187 insertions, 228 deletions

diff --git a/src/color.rs b/src/color.rs
index b676be7c..da26d2e2 100644
--- a/src/color.rs
+++ b/src/color.rs
@@ -6,7 +6,7 @@ use std::str::FromStr;
 /// A color in a dynamic format.
 #[derive(Copy, Clone, Eq, PartialEq)]
 pub enum Color {
-    /// An 8-bit RGBA color.
+    /// An 8-bit RGBA color: `#423abaff`.
     Rgba(RgbaColor),
 }
 
@@ -18,13 +18,7 @@ impl Debug for Color {
     }
 }
 
-/// An 8-bit RGBA color.
-///
-/// # Example
-/// ```typst
-/// [page: background=#423abaff]
-///                   ^^^^^^^^
-/// ```
+/// An 8-bit RGBA color: `#423abaff`.
 #[derive(Copy, Clone, Eq, PartialEq)]
 pub struct RgbaColor {
     /// Red channel.
diff --git a/src/eval/args.rs b/src/eval/args.rs
index 765ae09c..b379b975 100644
--- a/src/eval/args.rs
+++ b/src/eval/args.rs
@@ -86,7 +86,7 @@ impl Args {
         })
     }
 
-    /// Retrieve and remove all matching keyword arguments.
+    /// Retrieve and remove all matching named arguments.
     pub fn find_all_str<T>(&mut self) -> impl Iterator<Item = (String, T)> + '_
     where
         T: TryFromValue,
diff --git a/src/eval/dict.rs b/src/eval/dict.rs
index 1374c840..efa5cb37 100644
--- a/src/eval/dict.rs
+++ b/src/eval/dict.rs
@@ -160,11 +160,9 @@ impl<V: Debug> Debug for Dict<V> {
                 if self.0 {
                     f.write_str("\"")?;
                 }
-                if f.alternate() {
-                    f.write_str(" = ")?;
-                } else {
-                    f.write_str("=")?;
-                }
+
+                f.write_str(": ")?;
+
                 self.2.fmt(f)
             }
         }
@@ -511,13 +509,13 @@ mod tests {
         dict.insert("sp ace", "quotes");
         assert_eq!(
             format!("{:?}", dict),
-            r#"(10="hello", "sp ace"="quotes", twenty="there")"#,
+            r#"(10: "hello", "sp ace": "quotes", twenty: "there")"#,
         );
         assert_eq!(format!("{:#?}", dict).lines().collect::<Vec<_>>(), [
             "(",
-            r#"    10 = "hello","#,
-            r#"    "sp ace" = "quotes","#,
-            r#"    twenty = "there","#,
+            r#"    10: "hello","#,
+            r#"    "sp ace": "quotes","#,
+            r#"    twenty: "there","#,
             ")",
         ]);
     }
diff --git a/src/eval/value.rs b/src/eval/value.rs
index a27e9aa9..f15ae0c5 100644
--- a/src/eval/value.rs
+++ b/src/eval/value.rs
@@ -36,7 +36,7 @@ pub enum Value {
     Color(Color),
     /// A string: `"string"`.
     Str(String),
-    /// A dictionary value: `(false, 12cm, greeting="hi")`.
+    /// A dictionary value: `(false, 12cm, greeting: "hi")`.
     Dict(ValueDict),
     /// A content value: `{*Hi* there}`.
     Content(SynTree),
@@ -125,7 +125,7 @@ impl Debug for Value {
 ///
 /// # Example
 /// ```typst
-/// (false, 12cm, greeting="hi")
+/// (false, 12cm, greeting: "hi")
 /// ```
 pub type ValueDict = Dict<SpannedEntry<Value>>;
 
diff --git a/src/library/layout.rs b/src/library/layout.rs
index c014cc34..c888ea18 100644
--- a/src/library/layout.rs
+++ b/src/library/layout.rs
@@ -12,7 +12,7 @@ use crate::prelude::*;
 /// - first (optional, `Alignment`): An alignment for any of the two axes.
 /// - second (optional, `Alignment`): An alignment for the other axis.
 ///
-/// # Keyword arguments
+/// # Named arguments
 /// - `horizontal` (`Alignment`): An alignment for the horizontal axis.
 /// - `vertical` (`Alignment`): An alignment for the vertical axis.
 ///
@@ -188,7 +188,7 @@ impl Display for SpecAlign {
 
 /// `box`: Layout content into a box.
 ///
-/// # Keyword arguments
+/// # Named arguments
 /// - `width` (`linear` relative to parent width): The width of the box.
 /// - `height` (`linear` relative to parent height): The height of the box.
 pub fn boxed(mut args: Args, ctx: &mut EvalContext) -> Value {
@@ -268,7 +268,7 @@ fn spacing(mut args: Args, ctx: &mut EvalContext, axis: SpecAxis) -> Value {
 /// # Positional arguments
 /// - Paper name (optional, `Paper`).
 ///
-/// # Keyword arguments
+/// # Named arguments
 /// - `width` (`length`): The width of pages.
 /// - `height` (`length`): The height of pages.
 /// - `margins` (`linear` relative to sides): The margins for all sides.
diff --git a/src/library/style.rs b/src/library/style.rs
index 8b8d9f26..8571dac6 100644
--- a/src/library/style.rs
+++ b/src/library/style.rs
@@ -2,9 +2,9 @@ use std::rc::Rc;
 
 use fontdock::{FontStretch, FontStyle, FontWeight};
 
+use crate::color::{Color, RgbaColor};
 use crate::eval::StringLike;
 use crate::geom::Linear;
-use crate::color::{Color, RgbaColor};
 use crate::prelude::*;
 
 /// `font`: Configure the font.
@@ -13,7 +13,7 @@ use crate::prelude::*;
 /// - Font size (optional, `linear` relative to current font size).
 /// - Font families ... (optional, variadic, `Family`)
 ///
-/// # Keyword arguments
+/// # Named arguments
 /// - `style` (`Style`): The font style.
 /// - `weight` (`Weight`): The font weight.
 /// - `stretch` (`Stretch`): The font stretch.
@@ -26,17 +26,17 @@ use crate::prelude::*;
 /// # Examples
 /// Set font size and font families.
 /// ```typst
-/// [font: 12pt, "Arial", "Noto Sans", sans-serif]
+/// [font 12pt, "Arial", "Noto Sans", sans-serif]
 /// ```
 ///
 /// Redefine the default sans-serif family to a single font family.
 /// ```typst
-/// [font: sans-serif="Source Sans Pro"]
+/// [font sans-serif: "Source Sans Pro"]
 /// ```
 ///
 /// Redefine the default emoji family with a fallback.
 /// ```typst
-/// [font: emoji=("Segoe UI Emoji", "Noto Emoji")]
+/// [font emoji: ("Segoe UI Emoji", "Noto Emoji")]
 /// ```
 ///
 /// # Enumerations
diff --git a/src/parse/mod.rs b/src/parse/mod.rs
index 04a9de58..3f647b12 100644
--- a/src/parse/mod.rs
+++ b/src/parse/mod.rs
@@ -154,7 +154,7 @@ fn bracket_call(p: &mut Parser) -> ExprCall {
     let mut outer = vec![];
     let mut inner = p.span(|p| bracket_subheader(p));
 
-    while p.eat_if(Token::Chain) {
+    while p.eat_if(Token::Pipe) {
         outer.push(inner);
         inner = p.span(|p| bracket_subheader(p));
     }
@@ -186,28 +186,17 @@ fn bracket_subheader(p: &mut Parser) -> ExprCall {
 
     p.skip_white();
     let name = p.span(|p| ident(p)).transpose().unwrap_or_else(|| {
+        let what = "function name";
         if p.eof() {
-            p.diag_expected_at("function name", start);
+            p.diag_expected_at(what, start);
         } else {
-            p.diag_expected("function name");
+            p.diag_expected(what);
         }
         Ident(String::new()).span_with(start)
     });
 
     p.skip_white();
-    let args = if p.eat_if(Token::Colon) {
-        p.skip_white();
-        p.span(|p| dict_contents(p).0)
-    } else {
-        // Ignore the rest if there's no colon.
-        p.span(|p| {
-            if !p.eof() {
-                p.diag_expected_at("colon", p.pos());
-            }
-            p.eat_while(|_| true);
-            LitDict::new()
-        })
-    };
+    let args = p.span(|p| dict_contents(p).0);
 
     p.end_group();
     ExprCall { name, args }
@@ -285,8 +274,8 @@ fn dict_entry(p: &mut Parser) -> Option<LitDictEntry> {
         p.skip_white();
         match p.peek() {
             // Key-value pair.
-            Some(Token::Equals) => {
-                p.eat_assert(Token::Equals);
+            Some(Token::Colon) => {
+                p.eat_assert(Token::Colon);
                 p.skip_white();
                 if let Some(expr) = expr(p) {
                     Some(LitDictEntry {
@@ -463,7 +452,7 @@ fn content(p: &mut Parser) -> SynTree {
     tree
 }
 
-/// Parse a parenthesized expression: `(a + b)`, `(1, key="value").
+/// Parse a parenthesized expression: `(a + b)`, `(1, name: "value").
 fn parenthesized(p: &mut Parser) -> Expr {
     p.start_group(Group::Paren);
     let (dict, coercible) = dict_contents(p);
diff --git a/src/parse/parser.rs b/src/parse/parser.rs
index a8e5883a..d23aec3f 100644
--- a/src/parse/parser.rs
+++ b/src/parse/parser.rs
@@ -40,24 +40,24 @@ impl<'s> Parser<'s> {
 
     /// Eat the next token and add a diagnostic that it is not the expected
     /// `thing`.
-    pub fn diag_expected(&mut self, thing: &str) {
+    pub fn diag_expected(&mut self, what: &str) {
         let before = self.pos();
         if let Some(found) = self.eat() {
             let after = self.pos();
             self.diag(error!(
                 before .. after,
                 "expected {}, found {}",
-                thing,
+                what,
                 found.name(),
             ));
         } else {
-            self.diag_expected_at(thing, self.pos());
+            self.diag_expected_at(what, self.pos());
         }
     }
 
     /// Add a diagnostic that the `thing` was expected at the given position.
-    pub fn diag_expected_at(&mut self, thing: &str, pos: Pos) {
-        self.diag(error!(pos, "expected {}", thing));
+    pub fn diag_expected_at(&mut self, what: &str, pos: Pos) {
+        self.diag(error!(pos, "expected {}", what));
     }
 
     /// Eat the next token and add a diagnostic that it is unexpected.
@@ -220,7 +220,7 @@ impl<'s> Parser<'s> {
             Token::RightParen => Group::Paren,
             Token::RightBracket => Group::Bracket,
             Token::RightBrace => Group::Brace,
-            Token::Chain => Group::Subheader,
+            Token::Pipe => Group::Subheader,
             _ => return Some(token),
         };
 
diff --git a/src/parse/tests.rs b/src/parse/tests.rs
index 1b6df74b..95d04928 100644
--- a/src/parse/tests.rs
+++ b/src/parse/tests.rs
@@ -164,7 +164,7 @@ macro_rules! test {
 // Test expressions.
 macro_rules! v {
     ($src:expr => $($tts:tt)*) => {
-        t!(concat!("[val: ", $src, "]") => F!("val"; $($tts)*));
+        t!(concat!("[val ", $src, "]") => F!("val"; $($tts)*));
     }
 }
 
@@ -233,7 +233,7 @@ fn test_parse_groups() {
     e!("[)" => s(1, 2, "expected function name, found closing paren"),
                s(2, 2, "expected closing bracket"));
 
-    e!("[v:{]}" => s(4, 4, "expected closing brace"),
+    e!("[v {]}" => s(4, 4, "expected closing brace"),
                    s(5, 6, "unexpected closing brace"));
 }
 
@@ -250,9 +250,9 @@ fn test_parse_simple_nodes() {
     t!("\n\n\nhello"    => P, T("hello"));
     t!(r"a\ b"          => T("a"), L, S, T("b"));
 
-    e!("\\u{d421c809}"    => s(0, 12, "invalid unicode escape sequence"));
-    e!("\\u{abc"          => s(6, 6, "expected closing brace"));
-    t!("💜\n\n 🌍"       => T("💜"), P, T("🌍"));
+    e!("\\u{d421c809}" => s(0, 12, "invalid unicode escape sequence"));
+    e!("\\u{abc"       => s(6, 6, "expected closing brace"));
+    t!("💜\n\n 🌍"    => T("💜"), P, T("🌍"));
 
     ts!("hi"   => s(0, 2, T("hi")));
     ts!("*Hi*" => s(0, 1, B), s(1, 3, T("Hi")), s(3, 4, B));
@@ -296,10 +296,10 @@ fn test_parse_comments() {
     e!("🌎\n*/n" => s(5, 7, "unexpected end of block comment"));
 
     // In header.
-    t!("[val:/*12pt*/]"          => F!("val"));
-    t!("[val \n /* \n */:]"      => F!("val"));
-    e!("[val \n /* \n */:]"      => );
-    e!("[val : 12, /* \n */ 14]" => );
+    t!("[val /*12pt*/]"        => F!("val"));
+    t!("[val \n /* \n */]"     => F!("val"));
+    e!("[val \n /* \n */]"     => );
+    e!("[val 12, /* \n */ 14]" => );
 }
 
 #[test]
@@ -357,40 +357,23 @@ fn test_parse_function_names() {
 #[test]
 fn test_parse_chaining() {
     // Things the parser has to make sense of
-    t!("[hi: (5.0, 2.1 >> you]" => F!("hi"; Dict![Float(5.0), Float(2.1)], Tree![F!("you")]));
-    t!("[box >> pad: 1pt][Hi]"  => F!("box"; Tree![
+    t!("[hi (5.0, 2.1 | you]" => F!("hi"; Dict![Float(5.0), Float(2.1)], Tree![F!("you")]));
+    t!("[box | pad: 1pt][Hi]"  => F!("box"; Tree![
         F!("pad"; Length(1.0, Pt), Tree!(T("Hi")))
     ]));
-    t!("[bold: 400, >> emph >> sub: 1cm]" => F!("bold"; Int(400), Tree![
+    t!("[bold 400, | emph | sub: 1cm]" => F!("bold"; Int(400), Tree![
         F!("emph"; Tree!(F!("sub"; Length(1.0, Cm))))
     ]));
 
     // Errors for unclosed / empty predecessor groups
-    e!("[hi: (5.0, 2.1 >> you]" => s(15, 15, "expected closing paren"));
-    e!("[>> abc]"               => s(1, 1, "expected function name"));
-    e!("[box >>][Hi]"           => s(7, 7, "expected function name"));
-}
-
-#[test]
-fn test_parse_colon_starting_func_args() {
-    // Just colon without args.
-    e!("[val:]" => );
-
-    // Wrong token.
-    t!("[val=]"     => F!("val"));
-    e!("[val=]"     => s(4, 4, "expected colon"));
-    e!("[val/🌎:$]" => s(4, 4, "expected colon"));
-
-    // String in invalid header without colon still parsed as string
-    // _Note_: No "expected quote" error because not even the string was
-    //       expected.
-    e!("[val/\"]" => s(4, 4, "expected colon"),
-                     s(7, 7, "expected closing bracket"));
+    e!("[hi (5.0, 2.1 | you]" => s(14, 14, "expected closing paren"));
+    e!("[| abc]"              => s(1, 1, "expected function name"));
+    e!("[box |][Hi]"          => s(6, 6, "expected function name"));
 }
 
 #[test]
 fn test_parse_function_bodies() {
-    t!("[val: 1][*Hi*]" => F!("val"; Int(1), Tree![B, T("Hi"), B]));
+    t!("[val 1][*Hi*]" => F!("val"; Int(1), Tree![B, T("Hi"), B]));
     e!(" [val][ */]"    => s(8, 10, "unexpected end of block comment"));
 
     // Raw in body.
@@ -431,24 +414,24 @@ fn test_parse_values() {
 
     // Content.
     v!("{_hi_}"        => Tree![E, T("hi"), E]);
-    e!("[val: {_hi_}]" => );
+    e!("[val {_hi_}]" => );
     v!("[hi]"          => Tree![F!("hi")]);
-    e!("[val: [hi]]"   => );
+    e!("[val [hi]]"   => );
 
     // Healed colors.
     v!("#12345"            => Color(RgbaColor::new(0, 0, 0, 0xff)));
-    e!("[val: #12345]"     => s(6, 12, "invalid color"));
-    e!("[val: #a5]"        => s(6, 9,  "invalid color"));
-    e!("[val: #14b2ah]"    => s(6, 13, "invalid color"));
-    e!("[val: #f075ff011]" => s(6, 16, "invalid color"));
+    e!("[val #12345]"     => s(5, 11, "invalid color"));
+    e!("[val #a5]"        => s(5, 8,  "invalid color"));
+    e!("[val #14b2ah]"    => s(5, 12, "invalid color"));
+    e!("[val #f075ff011]" => s(5, 15, "invalid color"));
 
     // Unclosed string.
     v!("\"hello"        => Str("hello]"));
-    e!("[val: \"hello]" => s(13, 13, "expected quote"),
-                           s(13, 13, "expected closing bracket"));
+    e!("[val \"hello]" => s(12, 12, "expected quote"),
+                          s(12, 12, "expected closing bracket"));
 
     // Spanned.
-    ts!("[val: 1.4]" => s(0, 10, F!(s(1, 4, "val"), 6 .. 9; s(6, 9, Float(1.4)))));
+    ts!("[val 1.4]" => s(0, 9, F!(s(1, 4, "val"), 5 .. 8; s(5, 8, Float(1.4)))));
 }
 
 #[test]
@@ -485,24 +468,24 @@ fn test_parse_expressions() {
     v!("3/4*5" => Binary(Mul, Binary(Div, Int(3), Int(4)), Int(5)));
 
     // Spanned.
-    ts!("[val: 1 + 3]" => s(0, 12, F!(
-        s(1, 4, "val"), 6 .. 11; s(6, 11, Binary(
-            s(8, 9, Add),
-            s(6, 7, Int(1)),
-            s(10, 11, Int(3))
+    ts!("[val 1 + 3]" => s(0, 11, F!(
+        s(1, 4, "val"), 5 .. 10; s(5, 10, Binary(
+            s(7, 8, Add),
+            s(5, 6, Int(1)),
+            s(9, 10, Int(3))
         ))
     )));
 
     // Span of parenthesized expression contains parens.
-    ts!("[val: (1)]" => s(0, 10, F!(s(1, 4, "val"), 6 .. 9; s(6, 9, Int(1)))));
+    ts!("[val (1)]" => s(0, 9, F!(s(1, 4, "val"), 5 .. 8; s(5, 8, Int(1)))));
 
     // Invalid expressions.
-    v!("4pt--"        => Length(4.0, Pt));
-    e!("[val: 4pt--]" => s(10, 11, "missing factor"),
-                         s(6, 10, "missing right summand"));
+    v!("4pt--"       => Length(4.0, Pt));
+    e!("[val 4pt--]" => s(9, 10, "missing factor"),
+                        s(5, 9, "missing right summand"));
 
-    v!("3mm+4pt*"        => Binary(Add, Length(3.0, Mm), Length(4.0, Pt)));
-    e!("[val: 3mm+4pt*]" => s(10, 14, "missing right factor"));
+    v!("3mm+4pt*"       => Binary(Add, Length(3.0, Mm), Length(4.0, Pt)));
+    e!("[val 3mm+4pt*]" => s(9, 13, "missing right factor"));
 }
 
 #[test]
@@ -511,25 +494,25 @@ fn test_parse_dicts() {
     v!("()"                 => Dict![]);
     v!("(false)"            => Bool(false));
     v!("(true,)"            => Dict![Bool(true)]);
-    v!("(key=val)"          => Dict!["key" => Id("val")]);
+    v!("(key: val)"          => Dict!["key" => Id("val")]);
     v!("(1, 2)"             => Dict![Int(1), Int(2)]);
-    v!("(1, key=\"value\")" => Dict![Int(1), "key" => Str("value")]);
+    v!("(1, key: \"value\")" => Dict![Int(1), "key" => Str("value")]);
 
     // Decorations.
-    d!("[val: key=hi]"    => s(6, 9, DictKey));
-    d!("[val: (key=hi)]"  => s(7, 10, DictKey));
-    d!("[val: f(key=hi)]" => s(8, 11, DictKey));
+    d!("[val key: hi]"    => s(5, 8, DictKey));
+    d!("[val (key: hi)]"  => s(6, 9, DictKey));
+    d!("[val f(key: hi)]" => s(7, 10, DictKey));
 
-    // Spanned with spacing around keyword arguments.
-    ts!("[val: \n hi \n = /* //\n */ \"s\n\"]" => s(0, 30, F!(
+    // Spanned with spacing around named arguments.
+    ts!("[val  \n hi \n : /* //\n */ \"s\n\"]" => s(0, 30, F!(
         s(1, 4, "val"),
         8 .. 29; s(8, 10, "hi") => s(25, 29, Str("s\n"))
     )));
-    e!("[val: \n hi \n = /* //\n */ \"s\n\"]" => );
+    e!("[val  \n hi \n : /* //\n */ \"s\n\"]" => );
 }
 
 #[test]
-fn test_parse_dicts_compute_func_calls() {
+fn test_parse_dicts_paren_func_calls() {
     v!("empty()"                  => Call!("empty"));
     v!("add ( 1 , 2 )"            => Call!("add"; Int(1), Int(2)));
     v!("items(\"fire\", #f93a6d)" => Call!("items";
@@ -537,25 +520,25 @@ fn test_parse_dicts_compute_func_calls() {
     ));
 
     // More complex.
-    v!("css(1pt, rgb(90, 102, 254), \"solid\")" => Call!(
+    v!(r#"css(1pt, color: rgb(90, 102, 254), stroke: "solid")"# => Call!(
         "css";
         Length(1.0, Pt),
-        Call!("rgb"; Int(90), Int(102), Int(254)),
-        Str("solid"),
+        "color" => Call!("rgb"; Int(90), Int(102), Int(254)),
+        "stroke" => Str("solid"),
     ));
 
     // Unclosed.
-    v!("lang(中文]"       => Call!("lang"; Id("中文")));
-    e!("[val: lang(中文]" => s(17, 17, "expected closing paren"));
+    v!("lang(中文]"      => Call!("lang"; Id("中文")));
+    e!("[val lang(中文]" => s(16, 16, "expected closing paren"));
 
     // Invalid name.
-    v!("👠(\"abc\", 13e-5)"        => Dict!(Str("abc"), Float(13.0e-5)));
-    e!("[val: 👠(\"abc\", 13e-5)]" => s(6, 10, "invalid token"));
+    v!("👠(\"abc\", 13e-5)"       => Dict!(Str("abc"), Float(13.0e-5)));
+    e!("[val 👠(\"abc\", 13e-5)]" => s(5, 9, "invalid token"));
 }
 
 #[test]
 fn test_parse_dicts_nested() {
-    v!("(1, ( ab=(), d = (3, 14pt) )), false" =>
+    v!("(1, ( ab:(), d : (3, 14pt) )), false" =>
         Dict![
             Int(1),
             Dict!(
@@ -570,28 +553,28 @@ fn test_parse_dicts_nested() {
 #[test]
 fn test_parse_dicts_errors() {
     // Expected value.
-    e!("[val: (=)]"         => s(7, 8, "unexpected equals sign"));
-    e!("[val: (,)]"         => s(7, 8, "unexpected comma"));
-    v!("(\x07 abc,)"        => Dict![Id("abc")]);
-    e!("[val: (\x07 abc,)]" => s(7, 8, "invalid token"));
-    e!("[val: (key=,)]"     => s(11, 12, "expected value, found comma"));
-    e!("[val: hi,)]"        => s(9, 10, "unexpected closing paren"));
+    e!("[val (:)]"         => s(6, 7, "unexpected colon"));
+    e!("[val (,)]"         => s(6, 7, "unexpected comma"));
+    v!("(\x07 abc,)"       => Dict![Id("abc")]);
+    e!("[val (\x07 abc,)]" => s(6, 7, "invalid token"));
+    e!("[val (key:,)]"     => s(10, 11, "expected value, found comma"));
+    e!("[val hi,)]"        => s(8, 9, "unexpected closing paren"));
 
     // Expected comma.
-    v!("(true false)"        => Dict![Bool(true), Bool(false)]);
-    e!("[val: (true false)]" => s(11, 11, "expected comma"));
+    v!("(true false)"       => Dict![Bool(true), Bool(false)]);
+    e!("[val (true false)]" => s(10, 10, "expected comma"));
 
     // Expected closing paren.
-    e!("[val: (#000]" => s(11, 11, "expected closing paren"));
-    e!("[val: (key]"  => s(10, 10, "expected closing paren"));
-    e!("[val: (key=]" => s(11, 11, "expected value"),
-                         s(11, 11, "expected closing paren"));
+    e!("[val (#000]" => s(10, 10, "expected closing paren"));
+    e!("[val (key]"  => s(9, 9, "expected closing paren"));
+    e!("[val (key:]" => s(10, 10, "expected value"),
+                        s(10, 10, "expected closing paren"));
 
     // Bad key.
-    v!("true=you"        => Bool(true), Id("you"));
-    e!("[val: true=you]" => s(10, 11, "unexpected equals sign"));
+    v!("true:you"       => Bool(true), Id("you"));
+    e!("[val true:you]" => s(9, 10, "unexpected colon"));
 
-    // Unexpected equals sign.
-    v!("z=y=4"        => "z" => Id("y"), Int(4));
-    e!("[val: z=y=4]" => s(9, 10, "unexpected equals sign"));
+    // Unexpected colon.
+    v!("z:y:4"       => "z" => Id("y"), Int(4));
+    e!("[val z:y:4]" => s(8, 9, "unexpected colon"));
 }
diff --git a/src/parse/tokens.rs b/src/parse/tokens.rs
index 3dcc6460..c9e159f1 100644
--- a/src/parse/tokens.rs
+++ b/src/parse/tokens.rs
@@ -109,8 +109,7 @@ impl<'s> Iterator for Tokens<'s> {
                 ')' => Token::RightParen,
                 ':' => Token::Colon,
                 ',' => Token::Comma,
-                '=' => Token::Equals,
-                '>' if self.s.eat_if('>') => Token::Chain,
+                '|' => Token::Pipe,
                 '+' => Token::Plus,
                 '-' => Token::Hyphen,
                 '*' => Token::Star,
@@ -567,7 +566,7 @@ mod tests {
         t!(Body[" "]: r"\"  => Backslash);
 
         // Test header symbols.
-        t!(Body[" /"]: ":,=>>/+-" => T(":,=>>/+-"));
+        t!(Body[" /"]: ":,=|/+-" => T(":,=|/+-"));
     }
 
     #[test]
@@ -652,8 +651,7 @@ mod tests {
         // Test structural tokens.
         t!(Header: ":"        => Colon);
         t!(Header: ","        => Comma);
-        t!(Header: "="        => Equals);
-        t!(Header: ">>"       => Chain);
+        t!(Header: "|"        => Pipe);
         t!(Header: "+"        => Plus);
         t!(Header: "-"        => Hyphen);
         t!(Header[" a1"]: "*" => Star);
diff --git a/src/syntax/expr.rs b/src/syntax/expr.rs
index 09729f52..91f4053c 100644
--- a/src/syntax/expr.rs
+++ b/src/syntax/expr.rs
@@ -7,7 +7,7 @@ use super::*;
 pub enum Expr {
     /// A literal: `true`, `1cm`, `"hi"`, `{_Hey!_}`.
     Lit(Lit),
-    /// An invocation of a function: `[foo: ...]`, `foo(...)`.
+    /// An invocation of a function: `[foo ...]`, `foo(...)`.
     Call(ExprCall),
     /// A unary operation: `-x`.
     Unary(ExprUnary),
@@ -15,7 +15,7 @@ pub enum Expr {
     Binary(ExprBinary),
 }
 
-/// An invocation of a function: `[foo: ...]`, `foo(...)`.
+/// An invocation of a function: `[foo ...]`, `foo(...)`.
 #[derive(Debug, Clone, PartialEq)]
 pub struct ExprCall {
     /// The name of the function.
diff --git a/src/syntax/lit.rs b/src/syntax/lit.rs
index e8647965..84d5c6f4 100644
--- a/src/syntax/lit.rs
+++ b/src/syntax/lit.rs
@@ -27,17 +27,17 @@ pub enum Lit {
     Color(RgbaColor),
     /// A string literal: `"hello!"`.
     Str(String),
-    /// A dictionary literal: `(false, 12cm, greeting = "hi")`.
+    /// A dictionary literal: `(false, 12cm, greeting: "hi")`.
     Dict(LitDict),
     /// A content literal: `{*Hello* there!}`.
     Content(SynTree),
 }
 
-/// A dictionary literal: `(false, 12cm, greeting = "hi")`.
+/// A dictionary literal: `(false, 12cm, greeting: "hi")`.
 #[derive(Debug, Default, Clone, PartialEq)]
 pub struct LitDict(pub Vec<LitDictEntry>);
 
-/// An entry in a dictionary literal: `false` or `greeting = "hi"`.
+/// An entry in a dictionary literal: `false` or `greeting: "hi"`.
 #[derive(Debug, Clone, PartialEq)]
 pub struct LitDictEntry {
     /// The key of the entry if there was one: `greeting`.
diff --git a/src/syntax/token.rs b/src/syntax/token.rs
index e105ad2f..12f4d10d 100644
--- a/src/syntax/token.rs
+++ b/src/syntax/token.rs
@@ -54,10 +54,8 @@ pub enum Token<'s> {
     Colon,
     /// A comma: `,`.
     Comma,
-    /// An equals sign: `=`.
-    Equals,
-    /// A double forward chevron: `>>`.
-    Chain,
+    /// A pipe: `|`.
+    Pipe,
     /// A plus: `+`.
     Plus,
     /// A hyphen: `-`.
@@ -150,8 +148,7 @@ impl<'s> Token<'s> {
 
             Self::Colon => "colon",
             Self::Comma => "comma",
-            Self::Equals => "equals sign",
-            Self::Chain => "function chaining operator",
+            Self::Pipe => "pipe",
             Self::Plus => "plus sign",
             Self::Hyphen => "minus sign",
             Self::Slash => "slash",
diff --git a/tests/typ/example-coma.typ b/tests/typ/example-coma.typ
index d41032c1..d559a6fb 100644
--- a/tests/typ/example-coma.typ
+++ b/tests/typ/example-coma.typ
@@ -1,6 +1,6 @@
 // Test integration of syntax, page setup, box layout and alignment.
 
-[page: width=450pt, height=300pt, margins=1cm]
+[page width: 450pt, height: 300pt, margins: 1cm]
 
 [box][
     *Technische Universität Berlin* \
@@ -9,17 +9,17 @@
     Dr. Max Mustermann \
     Ola Nordmann, John Doe
 ]
-[align: right >> box][*WiSe 2019/2020* \ Woche 3]
+[align right | box][*WiSe 2019/2020* \ Woche 3]
 
-[v: 6mm]
+[v 6mm]
 
-[align: center][
-    #### 3. Übungsblatt Computerorientierte Mathematik II [v: 2mm]
-    *Abgabe: 03.05.2019* (bis 10:10 Uhr in MA 001) [v: 2mm]
+[align center][
+    #### 3. Übungsblatt Computerorientierte Mathematik II [v 2mm]
+    *Abgabe: 03.05.2019* (bis 10:10 Uhr in MA 001) [v 2mm]
     *Alle Antworten sind zu beweisen.*
 ]
 
-*1. Aufgabe* [align: right][(1 + 1 + 2 Punkte)]
+*1. Aufgabe* [align right][(1 + 1 + 2 Punkte)]
 
 Ein _Binärbaum_ ist ein Wurzelbaum, in dem jeder Knoten ≤ 2 Kinder hat.
 Die Tiefe eines Knotens _v_ ist die Länge des eindeutigen Weges von der Wurzel
diff --git a/tests/typ/func-font-error.typ b/tests/typ/func-font-error.typ
index 8de754ae..492ef9df 100644
--- a/tests/typ/func-font-error.typ
+++ b/tests/typ/func-font-error.typ
@@ -1,17 +1,17 @@
 // Test error cases of the `font` function.
 
 // Not one of the valid things for positional arguments.
-[font: false]
+[font false]
 
 // Wrong types.
-[font: style=bold, weight="thin", emoji=0]
+[font style: bold, weight: "thin", serif: 0]
 
 // Non-existing argument.
-[font: something="invalid"]
+[font something: "invalid"]
 
 // compare-ref: false
-// error: 4:8-4:13 unexpected argument
+// error: 4:7-4:12 unexpected argument
 // error: 7:14-7:18 invalid font style
-// error: 7:27-7:33 expected font weight, found string
-// error: 7:41-7:42 expected family or list of families, found integer
-// error: 10:8-10:27 unexpected argument
+// error: 7:28-7:34 expected font weight, found string
+// error: 7:43-7:44 expected family or list of families, found integer
+// error: 10:7-10:27 unexpected argument
diff --git a/tests/typ/func-font-fallback.typ b/tests/typ/func-font-fallback.typ
index b6509e62..9b60d46c 100644
--- a/tests/typ/func-font-fallback.typ
+++ b/tests/typ/func-font-fallback.typ
@@ -4,15 +4,15 @@
 Emoji: 🏀
 
 // CMU Serif + Noto Emoji.
-[font: "CMU Serif", "Noto Emoji"][Emoji: 🏀]
+[font "CMU Serif", "Noto Emoji"][Emoji: 🏀]
 
 // Class definitions.
-[font: math=("CMU Serif", "Latin Modern Math", "Noto Emoji")]
-[font: math][Math: ∫ α + β ➗ 3]
+[font math: ("CMU Serif", "Latin Modern Math", "Noto Emoji")]
+[font math][Math: ∫ α + β ➗ 3]
 
 // Class redefinition.
-[font: sans-serif="Noto Emoji"]
-[font: sans-serif=("Archivo", sans-serif)]
+[font sans-serif: "Noto Emoji"]
+[font sans-serif: ("Archivo", sans-serif)]
 New sans-serif. 🚀
 
 // TODO: Add tests for other scripts.
diff --git a/tests/typ/func-font-properties.typ b/tests/typ/func-font-properties.typ
index 78093e98..af8b8891 100644
--- a/tests/typ/func-font-properties.typ
+++ b/tests/typ/func-font-properties.typ
@@ -1,20 +1,20 @@
 // Test configuring font properties.
 
-[font: "PT Sans", 10pt]
+[font "PT Sans", 10pt]
 
 // Set same font size in three different ways.
-[font: 20pt][A]
-[font: 200%][A]
-[font: 15pt + 50%][A]
+[font 20pt][A]
+[font 200%][A]
+[font 15pt + 50%][A]
 
 // Do nothing.
 [font][Normal]
 
 // Set style (is available).
-[font: style=italic][Italic]
+[font style: italic][Italic]
 
 // Set weight (is available).
-[font: weight=bold][Bold]
+[font weight: bold][Bold]
 
 // Set stretch (not available, matching closest).
-[font: stretch=ultra-condensed][Condensed]
+[font stretch: ultra-condensed][Condensed]
diff --git a/tests/typ/func-h-and-v.typ b/tests/typ/func-h-and-v.typ
index 9c6d5730..0587b3ed 100644
--- a/tests/typ/func-h-and-v.typ
+++ b/tests/typ/func-h-and-v.typ
@@ -1,25 +1,25 @@
 // Test the `h` and `v` functions.
 
 // Ends paragraphs.
-Tightly [v: -5pt] packed
+Tightly [v -5pt] packed
 
 // Eating up soft spacing.
-Inv [h: 0pt] isible
+Inv [h 0pt] isible
 
 // Multiple spacings in a row.
-Add [h: 10pt] [h: 10pt] up
+Add [h 10pt] [h 10pt] up
 
 // Relative to font size.
-Relative [h: 100%] spacing
+Relative [h 100%] spacing
 
 // Missing spacing.
 Totally [h] ignored
 
 // Swapped axes.
-[page: main-dir=rtl, cross-dir=ttb][
-    1 [h: 1cm] 2
+[page main-dir: rtl, cross-dir: ttb][
+    1 [h 1cm] 2
 
-    3 [v: 1cm] 4 [v: -1cm] 5
+    3 [v 1cm] 4 [v -1cm] 5
 ]
 
 // error: 16:11-16:11 missing argument: spacing
diff --git a/tests/typ/func-image-error.typ b/tests/typ/func-image-error.typ
index e6a989ca..15553420 100644
--- a/tests/typ/func-image-error.typ
+++ b/tests/typ/func-image-error.typ
@@ -1,11 +1,11 @@
 // Test error cases of the `image` function.
 
 // File does not exist.
-[image: "path/does/not/exist"]
+[image "path/does/not/exist"]
 
 // File exists, but is no image.
-[image: "typ/image-error.typ"]
+[image "typ/image-error.typ"]
 
 // compare-ref: false
-// error: 4:9-4:30 failed to load image
-// error: 7:9-7:30 failed to load image
+// error: 4:8-4:29 failed to load image
+// error: 7:8-7:29 failed to load image
diff --git a/tests/typ/func-image-fit.typ b/tests/typ/func-image-fit.typ
index eca7c1e4..a9855aa4 100644
--- a/tests/typ/func-image-fit.typ
+++ b/tests/typ/func-image-fit.typ
@@ -1,23 +1,23 @@
 // Test configuring the size and fitting behaviour of images.
 
 // Fit to width of page.
-[image: "res/rhino.png"]
+[image "res/rhino.png"]
 
 // Fit to height of page.
-[page: width=270pt][
-    [image: "res/rhino.png"]
+[page width: 270pt][
+    [image "res/rhino.png"]
 ]
 
 // Set width explicitly.
-[image: "res/rhino.png", width=50pt]
+[image "res/rhino.png", width: 50pt]
 
 // Set height explicitly.
-[image: "res/rhino.png", height=50pt]
+[image "res/rhino.png", height: 50pt]
 
 // Set width and height explicitly and force stretching.
-[image: "res/rhino.png", width=25pt, height=50pt]
+[image "res/rhino.png", width: 25pt, height: 50pt]
 
 // Make sure the bounding-box of the image is correct.
-[align: bottom, right][
-    [image: "res/tiger.jpg"]
+[align bottom, right][
+    [image "res/tiger.jpg"]
 ]
diff --git a/tests/typ/func-image-formats.typ b/tests/typ/func-image-formats.typ
index 36b991d0..c12e3639 100644
--- a/tests/typ/func-image-formats.typ
+++ b/tests/typ/func-image-formats.typ
@@ -1,8 +1,8 @@
 // Test loading different image formats.
 
 // Load an RGBA PNG image.
-[image: "res/rhino.png"]
+[image "res/rhino.png"]
 [pagebreak]
 
 // Load an RGB JPEG image.
-[image: "res/tiger.jpg"]
+[image "res/tiger.jpg"]
diff --git a/tests/typ/func-page-body.typ b/tests/typ/func-page-body.typ
index 78e72d12..bfa9775d 100644
--- a/tests/typ/func-page-body.typ
+++ b/tests/typ/func-page-body.typ
@@ -1,6 +1,6 @@
 // Test a combination of pages with bodies and normal content.
 
-[page: height=50pt]
+[page height: 50pt]
 
 [page][First]
 [page][Second]
diff --git a/tests/typ/func-page-dirs.typ b/tests/typ/func-page-dirs.typ
index 09ba4e9e..47e8ae15 100644
--- a/tests/typ/func-page-dirs.typ
+++ b/tests/typ/func-page-dirs.typ
@@ -1,5 +1,5 @@
 // Test changing the layouting directions of pages.
 
-[page: main-dir=btt, cross-dir=rtl]
+[page main-dir: btt, cross-dir: rtl]
 
 Right to left!
diff --git a/tests/typ/func-page-error.typ b/tests/typ/func-page-error.typ
index e259a04e..1b2db60d 100644
--- a/tests/typ/func-page-error.typ
+++ b/tests/typ/func-page-error.typ
@@ -1,11 +1,11 @@
 // Test error cases of the `page` function.
 
 // Invalid paper.
-[page: nonexistant]
+[page nonexistant]
 
 // Aligned axes.
-[page: main-dir=ltr]
+[page main-dir: ltr]
 
 // compare-ref: false
-// error: 4:8-4:19 invalid paper
+// error: 4:7-4:18 invalid paper
 // error: 7:17-7:20 aligned axis
diff --git a/tests/typ/func-page-metrics.typ b/tests/typ/func-page-metrics.typ
index 6c7bd461..7e0bc2f8 100644
--- a/tests/typ/func-page-metrics.typ
+++ b/tests/typ/func-page-metrics.typ
@@ -1,25 +1,25 @@
 // Test configuring page sizes and margins.
 
 // Set width.
-[page: width=50pt][High]
+[page width: 50pt][High]
 
 // Set height.
-[page: height=50pt][Wide]
+[page height: 50pt][Wide]
 
 // Set all margins at once.
-[page: margins=40pt][
-    [align: top, left][TL]
-    [align: bottom, right][BR]
+[page margins: 40pt][
+    [align top, left][TL]
+    [align bottom, right][BR]
 ]
 
 // Set individual margins.
-[page: left=0pt >> align: left][Left]
-[page: right=0pt >> align: right][Right]
-[page: top=0pt >> align: top][Top]
-[page: bottom=0pt >> align: bottom][Bottom]
+[page left: 0pt   | align left][Left]
+[page right: 0pt  | align right][Right]
+[page top: 0pt    | align top][Top]
+[page bottom: 0pt | align bottom][Bottom]
 
 // Ensure that specific margins override general margins.
-[page: margins=0pt, left=40pt][Overriden]
+[page margins: 0pt, left: 40pt][Overriden]
 
 // Flip the page.
-[page: a10, flip=true][Flipped]
+[page a10, flip: true][Flipped]
diff --git a/tests/typ/func-pagebreak.typ b/tests/typ/func-pagebreak.typ
index 7fd9aae2..603e11d4 100644
--- a/tests/typ/func-pagebreak.typ
+++ b/tests/typ/func-pagebreak.typ
@@ -2,4 +2,4 @@
 
 First of two
 [pagebreak]
-[page: height=40pt]
+[page height: 40pt]
diff --git a/tests/typ/func-rgb.typ b/tests/typ/func-rgb.typ
index 44d87819..b47039a2 100644
--- a/tests/typ/func-rgb.typ
+++ b/tests/typ/func-rgb.typ
@@ -1,24 +1,24 @@
 // Test the `rgb` function.
 
 // Check the output.
-[rgb: 0.0, 0.3, 0.7] [val: #004db3]
+[rgb 0.0, 0.3, 0.7] [val #004db3]
 
 // Alpha channel.
-[rgb: 1.0, 0.0, 0.0, 0.5]
+[rgb 1.0, 0.0, 0.0, 0.5]
 
 // Value smaller than 0.0 and larger than 1.0
-[rgb: -30, 15.5, 0.5]
+[rgb -30, 15.5, 0.5]
 
 // Missing blue component.
-[rgb: 0, 1]
+[rgb 0, 1]
 
 // Missing all components.
 [rgb]
 
-// error: 4:23-4:26 unknown function
-// error: 10:7-10:10 should be between 0.0 and 1.0
-// error: 10:12-10:16 should be between 0.0 and 1.0
-// error: 13:7-13:11 missing argument: blue component
+// error: 4:22-4:25 unknown function
+// error: 10:6-10:9 should be between 0.0 and 1.0
+// error: 10:11-10:15 should be between 0.0 and 1.0
+// error: 13:6-13:10 missing argument: blue component
 // error: 16:5-16:5 missing argument: red component
 // error: 16:5-16:5 missing argument: green component
 // error: 16:5-16:5 missing argument: blue component