conlang: Move all cl-libs into the compiler directory

compiler/cl-ast/src/format.rs

@@ -0,0 +1,78 @@
+
+use delimiters::Delimiters;
+use std::fmt::Write;
+
+impl<W: Write + ?Sized> FmtAdapter for W {}
+pub trait FmtAdapter: Write {
+    fn indent(&mut self) -> Indent<Self> {
+        Indent { f: self }
+    }
+    fn delimit(&mut self, delim: Delimiters) -> Delimit<Self> {
+        Delimit::new(self, delim)
+    }
+}
+
+/// Pads text with leading indentation after every newline
+pub struct Indent<'f, F: Write + ?Sized> {
+    f: &'f mut F,
+}
+
+impl<'f, F: Write + ?Sized> Write for Indent<'f, F> {
+    fn write_str(&mut self, s: &str) -> std::fmt::Result {
+        for s in s.split_inclusive('\n') {
+            self.f.write_str(s)?;
+            if s.ends_with('\n') {
+                self.f.write_str("    ")?;
+            }
+        }
+        Ok(())
+    }
+}
+
+/// Prints [Delimiters] around anything formatted with this. Implies [Indent]
+pub struct Delimit<'f, F: Write + ?Sized> {
+    f: Indent<'f, F>,
+    delim: Delimiters,
+}
+impl<'f, F: Write + ?Sized> Delimit<'f, F> {
+    pub fn new(f: &'f mut F, delim: Delimiters) -> Self {
+        let mut f = f.indent();
+        let _ = f.write_str(delim.open);
+        Self { f, delim }
+    }
+}
+impl<'f, F: Write + ?Sized> Drop for Delimit<'f, F> {
+    fn drop(&mut self) {
+        let Self { f: Indent { f, .. }, delim } = self;
+        let _ = f.write_str(delim.close);
+    }
+}
+
+impl<'f, F: Write + ?Sized> Write for Delimit<'f, F> {
+    fn write_str(&mut self, s: &str) -> std::fmt::Result {
+        self.f.write_str(s)
+    }
+}
+
+pub mod delimiters {
+    #![allow(dead_code)]
+    #[derive(Clone, Copy, Debug)]
+    pub struct Delimiters {
+        pub open: &'static str,
+        pub close: &'static str,
+    }
+    /// Delimits with braces decorated with spaces  `" {\n"`, ..., `"\n}"`
+    pub const SPACED_BRACES: Delimiters = Delimiters { open: " {\n", close: "\n}" };
+    /// Delimits with braces on separate lines `{\n`, ..., `\n}`
+    pub const BRACES: Delimiters = Delimiters { open: "{\n", close: "\n}" };
+    /// Delimits with parentheses on separate lines `{\n`, ..., `\n}`
+    pub const PARENS: Delimiters = Delimiters { open: "(\n", close: "\n)" };
+    /// Delimits with square brackets on separate lines `{\n`, ..., `\n}`
+    pub const SQUARE: Delimiters = Delimiters { open: "[\n", close: "\n]" };
+    /// Delimits with braces on the same line `{ `, ..., ` }`
+    pub const INLINE_BRACES: Delimiters = Delimiters { open: "{ ", close: " }" };
+    /// Delimits with parentheses on the same line `( `, ..., ` )`
+    pub const INLINE_PARENS: Delimiters = Delimiters { open: "(", close: ")" };
+    /// Delimits with square brackets on the same line `[ `, ..., ` ]`
+    pub const INLINE_SQUARE: Delimiters = Delimiters { open: "[", close: "]" };
+}