Add color formatting

Cargo.lock

@@ -404,7 +404,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
 name = "snekdown"
-version = "0.11.0"
+version = "0.12.0"
 dependencies = [
  "chrono 0.4.11 (registry+https://github.com/rust-lang/crates.io-index)",
  "colored 1.9.3 (registry+https://github.com/rust-lang/crates.io-index)",

Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "snekdown"
-version = "0.11.0"
+version = "0.12.0"
 authors = ["trivernis <trivernis@protonmail.com>"]
 edition = "2018"
 license-file = "LICENSE"

README.md

@@ -158,6 +158,7 @@ _Underlined_
 ^Superscript^
 `Monospace`
 :Emoji:
+§[#0C0]Colored text§[] §[red] red §[]
 ```
 
 ## Roadmap
@@ -166,11 +167,12 @@ The end goal is to have a markup language with features similar to LaTeX.
 
 - [x] Checkboxes
 - [x] Emojis (\:emoji:)
+- [x] Colors
+- [ ] Watching and rendering on change
 - [ ] Metadata files
 - [ ] Bibliography
 - [ ] Math
 - [ ] Text sizes
-- [ ] Colors
 - [ ] Title pages
 - [ ] Glossary
 - [ ] Cross References

src/format/html.rs

@@ -59,6 +59,7 @@ impl ToHtml for Inline {
             Inline::Superscript(superscript) => superscript.to_html(),
             Inline::Checkbox(checkbox) => checkbox.to_html(),
             Inline::Emoji(emoji) => emoji.to_html(),
+            Inline::Colored(colored) => colored.to_html(),
         }
     }
 }
@@ -498,3 +499,13 @@ impl ToHtml for Emoji {
         )
     }
 }
+
+impl ToHtml for Colored {
+    fn to_html(&self) -> String {
+        format!(
+            "<span class='colored' style='color:{};'>{}</span>",
+            encode_attribute(self.color.as_str()),
+            self.value.to_html()
+        )
+    }
+}

src/parsing/elements.rs

@@ -158,6 +158,7 @@ pub enum Inline {
     Reference(Reference),
     Checkbox(Checkbox),
     Emoji(Emoji),
+    Colored(Colored),
 }
 
 #[derive(Clone, Debug)]
@@ -259,6 +260,12 @@ pub struct Emoji {
     pub(crate) name: String,
 }
 
+#[derive(Clone, Debug)]
+pub struct Colored {
+    pub(crate) value: Box<Inline>,
+    pub(crate) color: String,
+}
+
 // implementations
 
 impl Document {

src/parsing/inline.rs

@@ -17,6 +17,7 @@ pub(crate) trait ParseInline {
     fn parse_underlined(&mut self) -> ParseResult<UnderlinedText>;
     fn parse_superscript(&mut self) -> ParseResult<SuperscriptText>;
     fn parse_emoji(&mut self) -> ParseResult<Emoji>;
+    fn parse_colored(&mut self) -> ParseResult<Colored>;
     fn parse_plain(&mut self) -> ParseResult<PlainText>;
 }
 
@@ -47,6 +48,8 @@ impl ParseInline for Parser {
             Ok(Inline::Checkbox(checkbox))
         } else if let Ok(emoji) = self.parse_emoji() {
             Ok(Inline::Emoji(emoji))
+        } else if let Ok(colored) = self.parse_colored() {
+            Ok(Inline::Colored(colored))
         } else {
             Ok(Inline::Plain(self.parse_plain()?))
         }
@@ -214,7 +217,7 @@ impl ParseInline for Parser {
         let start_index = self.index;
         self.assert_special(&EMOJI, start_index)?;
         self.skip_char();
-        let name = self.get_string_until_or_revert(&[EMOJI], &[], start_index)?;
+        let name = self.get_string_until_or_revert(&[EMOJI], &[SPACE, LB], start_index)?;
         self.skip_char();
         if let Some(emoji) = gh_emoji::get(name.as_str()) {
             let emoji_char = *emoji.chars().collect::<Vec<char>>().first().unwrap();
@@ -226,4 +229,21 @@ impl ParseInline for Parser {
             Err(self.revert_with_error(start_index))
         }
     }
+
+    /// parses colored text
+    fn parse_colored(&mut self) -> ParseResult<Colored> {
+        let start_index = self.index;
+        self.assert_special_sequence(&SQ_COLOR_START, start_index)?;
+        self.skip_char();
+        let color =
+            self.get_string_until_or_revert(&[COLOR_CLOSE], &[SPACE, LB, SEMICOLON], start_index)?;
+        self.skip_char();
+        if color.is_empty() {
+            return Err(ParseError::new(self.index));
+        }
+        Ok(Colored {
+            value: Box::new(self.parse_inline()?),
+            color,
+        })
+    }
 }

src/parsing/tokens.rs

@@ -26,6 +26,8 @@ pub(crate) const SINGLE_QUOTE: char = '\'';
 pub(crate) const DOT: char = '.';
 pub(crate) const UP: char = '^';
 pub(crate) const COLON: char = ':';
+pub(crate) const PARAGRAPH: char = '§';
+pub(crate) const SEMICOLON: char = ';';
 
 // aliases
 
@@ -46,6 +48,9 @@ pub(crate) const PHOLDER_CLOSE: char = L_BRACKET;
 pub(crate) const CHECK_OPEN: char = R_BRACKET;
 pub(crate) const CHECK_CLOSE: char = L_BRACKET;
 pub(crate) const CHECK_CHECKED: char = X;
+pub(crate) const COLOR_START: char = PARAGRAPH;
+pub(crate) const COLOR_OPEN: char = R_BRACKET;
+pub(crate) const COLOR_CLOSE: char = L_BRACKET;
 
 pub(crate) const ITALIC: char = ASTERISK;
 pub(crate) const MONOSPACE: char = BACKTICK;
@@ -71,8 +76,18 @@ pub(crate) const BLOCK_SPECIAL_CHARS: [&[char]; 9] = [
     &SQ_CENTERED_START,
 ];
 
-pub(crate) const INLINE_SPECIAL_CHARS: [char; 10] = [
-    BACKTICK, TILDE, UNDERSCR, ASTERISK, DESC_OPEN, IMG_START, URL_OPEN, LB, SUPER, EMOJI,
+pub(crate) const INLINE_SPECIAL_CHARS: [char; 11] = [
+    BACKTICK,
+    TILDE,
+    UNDERSCR,
+    ASTERISK,
+    DESC_OPEN,
+    IMG_START,
+    URL_OPEN,
+    LB,
+    SUPER,
+    EMOJI,
+    COLOR_START,
 ];
 
 pub(crate) const LIST_SPECIAL_CHARS: [char; 14] = [
@@ -86,6 +101,7 @@ pub(crate) const SQ_RULER: [char; 5] = [MINUS, SPACE, MINUS, SPACE, MINUS];
 pub(crate) const SQ_PHOLDER_START: [char; 2] = [PHOLDER_OPEN, PHOLDER_OPEN];
 pub(crate) const SQ_PHOLDER_STOP: [char; 2] = [PHOLDER_CLOSE, PHOLDER_CLOSE];
 pub(crate) const SQ_CENTERED_START: [char; 2] = [PIPE, PIPE];
+pub(crate) const SQ_COLOR_START: [char; 2] = [COLOR_START, COLOR_OPEN];
 
 // expressions