Expand formatter

dust-lang/src/chunk.rs

@@ -3,7 +3,7 @@ use std::fmt::{self, Debug, Display};
 use colored::Colorize;
 use serde::{Deserialize, Serialize};
 
-use crate::{AnnotatedError, Formatter, Identifier, Instruction, Operation, Span, Type, Value};
+use crate::{AnnotatedError, Identifier, Instruction, Operation, Span, Type, Value};
 
 #[derive(Clone, PartialOrd, Ord, Serialize, Deserialize)]
 pub struct Chunk {
@@ -514,6 +514,7 @@ impl<'a> ChunkDisassembler<'a> {
         };
         let push_function_disassembly = |function_disassembly: &str, disassembly: &mut String| {
             disassembly.push_str(function_disassembly);
+            disassembly.push('\n');
         };
         let mut disassembly = String::new();
         let top_border = "┌".to_string() + &"─".repeat(self.width - 2) + "┐";
@@ -656,6 +657,7 @@ impl<'a> ChunkDisassembler<'a> {
             );
         }
 
+        disassembly.pop(); // Remove the last newline character
         disassembly
     }
 

dust-lang/src/formatter.rs

@@ -1,91 +1,198 @@
-use annotate_snippets::{renderer::Style, Level, Renderer, Snippet};
+use colored::{ColoredString, Colorize, CustomColor};
-use colored::{Colorize, CustomColor};
 
 use crate::{lex, Token};
 
-#[derive(Debug, Copy, Clone)]
+#[derive(Debug)]
 pub struct Formatter<'src> {
     source: &'src str,
-    origin: Option<&'src str>,
+    lines: Vec<(String, LineKind, usize)>,
-    footer: Option<&'src str>,
+    next_line: String,
+    indent: usize,
 }
 
 impl<'src> Formatter<'src> {
     pub fn new(source: &'src str) -> Self {
         Self {
             source,
-            origin: None,
+            lines: Vec::new(),
-            footer: None,
+            next_line: String::new(),
+            indent: 0,
         }
     }
 
-    pub fn origin(&mut self, origin: &'src str) -> &mut Self {
-        self.origin = Some(origin);
-
-        self
-    }
-
     pub fn footer(&mut self, footer: &'src str) -> &mut Self {
         self.source = footer;
 
         self
     }
 
-    pub fn format(&self) -> String {
+    pub fn format(&mut self) -> String {
         let tokens = match lex(self.source) {
             Ok(tokens) => tokens,
             Err(error) => return format!("{}", error),
         };
-        let mut block_depth = 0;
+        let mut line_kind = LineKind::Empty;
-        let mut formatted = String::new();
-        let line_break = |formatted: &mut String, block_depth: i32| {
-            formatted.push('\n');
-
-            for _ in 0..block_depth {
-                formatted.push_str("    ");
-            }
-        };
 
         for (token, _) in tokens {
+            use Token::*;
+
             match token {
-                Token::Boolean(boolean) => formatted.push_str(&boolean.red()),
+                Boolean(boolean) => {
-                Token::Byte(byte) => formatted.push_str(&byte.green()),
+                    self.push_colored(boolean.red());
-                Token::Character(character) => formatted.push_str(
+
-                    &character
+                    if line_kind != LineKind::Assignment {
+                        line_kind = LineKind::Expression;
+                    }
+                }
+                Byte(byte) => {
+                    self.push_colored(byte.green());
+
+                    if line_kind != LineKind::Assignment {
+                        line_kind = LineKind::Expression;
+                    }
+                }
+                Character(character) => {
+                    self.push_colored(
+                        character
                             .to_string()
                             .custom_color(CustomColor::new(225, 150, 150)),
-                ),
+                    );
-                Token::Float(float) => formatted.push_str(&float.yellow()),
-                Token::Identifier(identifier) => {
-                    formatted.push_str(&identifier.blue());
-                    formatted.push(' ');
-                }
-                Token::Integer(integer) => formatted.push_str(&integer.cyan()),
-                Token::String(string) => formatted.push_str(&string.magenta()),
-                Token::LeftCurlyBrace => {
-                    block_depth += 1;
 
-                    formatted.push_str(token.as_str());
+                    if line_kind != LineKind::Assignment {
-                    line_break(&mut formatted, block_depth)
+                        line_kind = LineKind::Expression;
                     }
-                Token::RightCurlyBrace => {
+                }
-                    block_depth -= 1;
+                Float(float) => {
+                    self.push_colored(float.yellow());
 
-                    line_break(&mut formatted, block_depth);
+                    if line_kind != LineKind::Assignment {
-                    formatted.push_str(token.as_str());
+                        line_kind = LineKind::Expression;
                     }
-                Token::Semicolon => {
-                    formatted.push_str(token.as_str());
-                    line_break(&mut formatted, block_depth);
                 }
-                Token::Eof => continue,
+                Identifier(identifier) => {
+                    self.push_colored(identifier.blue());
+                    self.next_line.push(' ');
+
+                    if line_kind != LineKind::Assignment {
+                        line_kind = LineKind::Expression;
+                    }
+                }
+                Integer(integer) => {
+                    self.push_colored(integer.cyan());
+
+                    if line_kind != LineKind::Assignment {
+                        line_kind = LineKind::Expression;
+                    }
+                }
+                String(string) => {
+                    self.push_colored(string.magenta());
+
+                    if line_kind != LineKind::Assignment {
+                        line_kind = LineKind::Expression;
+                    }
+                }
+                LeftCurlyBrace => {
+                    self.next_line.push_str(token.as_str());
+                    self.commit_line(LineKind::OpenBlock);
+
+                    self.indent += 1;
+                }
+                RightCurlyBrace => {
+                    self.commit_line(LineKind::CloseBlock);
+                    self.next_line.push_str(token.as_str());
+
+                    self.indent -= 1;
+                }
+                Semicolon => {
+                    if line_kind != LineKind::Assignment {
+                        line_kind = LineKind::Statement;
+                    }
+
+                    self.next_line.push_str(token.as_str());
+                    self.commit_line(line_kind);
+                }
+                Let => {
+                    line_kind = LineKind::Assignment;
+
+                    self.push_colored(token.as_str().bold());
+                    self.next_line.push(' ');
+                }
+                Break | Loop | Return | While => {
+                    line_kind = LineKind::Statement;
+
+                    self.push_colored(token.as_str().bold());
+                    self.next_line.push(' ');
+                }
+                Eof => continue,
                 token => {
-                    formatted.push_str(token.as_str());
+                    self.next_line.push_str(token.as_str());
-                    formatted.push(' ');
+                    self.next_line.push(' ');
                 }
             }
         }
 
-        formatted
+        let mut previous_index = 0;
+        let mut current_index = 1;
+
+        while current_index < self.lines.len() {
+            let (_, previous, _) = &self.lines[previous_index];
+            let (_, current, _) = &self.lines[current_index];
+
+            println!("{:?} {:?}", previous, current);
+
+            match (previous, current) {
+                (LineKind::Empty, _)
+                | (_, LineKind::Empty)
+                | (LineKind::OpenBlock, _)
+                | (_, LineKind::CloseBlock) => {}
+                (left, right) if left == right => {}
+                _ => {
+                    self.lines
+                        .insert(current_index, ("".to_string(), LineKind::Empty, 0));
                 }
             }
+
+            previous_index += 1;
+            current_index += 1;
+        }
+
+        let formatted = String::with_capacity(
+            self.lines
+                .iter()
+                .fold(0, |total, (line, _, _)| total + line.len()),
+        );
+
+        self.lines
+            .iter()
+            .enumerate()
+            .fold(formatted, |acc, (index, (line, _, indent))| {
+                let left_pad = "    ".repeat(*indent);
+
+                if index == 0 {
+                    return format!("{:<3}| {}{}", index + 1, left_pad, line);
+                }
+                format!("{}\n{:<3}| {}{}", acc, index + 1, left_pad, line)
+            })
+    }
+
+    fn push_colored(&mut self, colored: ColoredString) {
+        self.next_line.push_str(&format!("{}", colored));
+    }
+
+    fn commit_line(&mut self, line_kind: LineKind) {
+        self.lines
+            .push((self.next_line.clone(), line_kind, self.indent));
+        self.next_line.clear();
+    }
+}
+
+#[derive(Debug, Clone, Copy, PartialEq)]
+pub enum LineKind {
+    Assignment,
+    FunctionCall,
+    Statement,
+    Expression,
+    Empty,
+    OpenBlock,
+    CloseBlock,
+}