work

2024-10-18 16:52:12 -04:00
parent b15a40c4d9
commit 14a4fb1ff9
22 changed files with 1672 additions and 77 deletions
@@ -0,0 +1,146 @@
+use std::fmt::Debug;
+
+use super::CharCursor;
+
+#[derive(PartialEq, Eq, Clone, Copy)]
+pub enum Symbol {
+    Semicolon,
+    Colon,
+    DoubleColon,
+    Equals,
+    DoubleEquals,
+    Arrow,
+    DoubleArrow,
+    Plus,
+    Minus,
+    Asterisk,
+    Slash,
+    DoubleSlash,
+    Dot,
+    OpenParen,
+    CloseParen,
+    OpenCurly,
+    CloseCurly,
+    OpenSquare,
+    CloseSquare,
+    OpenAngle,
+    CloseAngle,
+    SingleQuote,
+    DoubleQuote,
+    Bang,
+    Ampersand,
+    DoubleAmpersand,
+    Pipe,
+    DoublePipe,
+    Comma,
+}
+
+impl Symbol {
+    pub fn parse(cursor: &mut CharCursor) -> Option<Self> {
+        Self::from_char(cursor.peek()?).map(|mut s| {
+            cursor.advance();
+            s.finish(cursor);
+            s
+        })
+    }
+    pub fn from_char(c: char) -> Option<Self> {
+        Some(match c {
+            '(' => Self::OpenParen,
+            ')' => Self::CloseParen,
+            '[' => Self::OpenSquare,
+            ']' => Self::CloseSquare,
+            '{' => Self::OpenCurly,
+            '}' => Self::CloseCurly,
+            '<' => Self::OpenAngle,
+            '>' => Self::CloseAngle,
+            ';' => Self::Semicolon,
+            ':' => Self::Colon,
+            '+' => Self::Plus,
+            '-' => Self::Minus,
+            '*' => Self::Asterisk,
+            '/' => Self::Slash,
+            '=' => Self::Equals,
+            '.' => Self::Dot,
+            '\'' => Self::SingleQuote,
+            '"' => Self::DoubleQuote,
+            '!' => Self::Bang,
+            '&' => Self::Ampersand,
+            '|' => Self::Pipe,
+            ',' => Self::Comma,
+            _ => return None,
+        })
+    }
+    pub fn finish(&mut self, cursor: &mut CharCursor) {
+        let Some(next) = cursor.peek() else {
+            return;
+        };
+        *self = match self {
+            Self::Colon => match next {
+                ':' => Self::DoubleColon,
+                _ => return,
+            },
+            Self::Minus => match next {
+                '>' => Self::Arrow,
+                _ => return,
+            },
+            Self::Equals => match next {
+                '=' => Self::DoubleEquals,
+                '>' => Self::DoubleArrow,
+                _ => return,
+            },
+            Self::Slash => match next {
+                '/' => Self::DoubleSlash,
+                _ => return,
+            },
+            Self::Ampersand => match next {
+                '&' => Self::DoubleAmpersand,
+                _ => return,
+            },
+            Self::Pipe => match next {
+                '&' => Self::DoublePipe,
+                _ => return,
+            },
+            _ => return,
+        };
+        cursor.advance();
+    }
+    pub fn str(&self) -> &str {
+        match self {
+            Self::Semicolon => ";",
+            Self::Colon => ":",
+            Self::DoubleColon => "::",
+            Self::Equals => "=",
+            Self::DoubleEquals => "==",
+            Self::Arrow => "->",
+            Self::DoubleArrow => "=>",
+            Self::Plus => "+",
+            Self::Minus => "-",
+            Self::Asterisk => "*",
+            Self::Slash => "/",
+            Self::DoubleSlash => "//",
+            Self::Dot => ".",
+            Self::OpenParen => "(",
+            Self::CloseParen => ")",
+            Self::OpenCurly => "{",
+            Self::CloseCurly => "}",
+            Self::OpenSquare => "[",
+            Self::CloseSquare => "]",
+            Self::OpenAngle => "<",
+            Self::CloseAngle => ">",
+            Self::SingleQuote => "'",
+            Self::DoubleQuote => "\"",
+            Self::Bang => "!",
+            Self::Comma => ",",
+            Self::Ampersand => "&",
+            Self::DoubleAmpersand => "&&",
+            Self::Pipe => "|",
+            Self::DoublePipe => "||",
+        }
+    }
+}
+
+impl Debug for Symbol {
+    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
+        write!(f, "'{}'", self.str())
+    }
+}