1 files changed, 106 insertions, 0 deletions
diff --git a/parser/src/error.rs b/parser/src/error.rs
new file mode 100644
index 0000000..ca68442
--- /dev/null
+++ b/parser/src/error.rs
@@ -0,0 +1,106 @@
+use std::{i64, process::exit};
+
+use colored::Colorize;
+use unicode_width::UnicodeWidthStr;
+
+#[derive(Debug)]
+pub enum Exit {
+    Code(i32),
+    IoError(std::io::Error),
+    SyntaxError {
+        content: String,
+        reason: String,
+        line: i64,
+        begin: i64,
+        end: i64,
+    },
+}
+
+impl From<std::io::Error> for Exit {
+    fn from(error: std::io::Error) -> Self {
+        Exit::IoError(error)
+    }
+}
+
+pub fn handle_exit(e: Exit) {
+    match e {
+        Exit::Code(code) => exit(code),
+        Exit::IoError(error) => print_parse_error(error.to_string()),
+        Exit::SyntaxError {
+            content,
+            reason,
+            line,
+            begin,
+            end,
+        } => {
+            print_syntax_error(content, reason, line, begin, end);
+        }
+    }
+}
+
+fn print_parse_error(content: impl AsRef<str>) {
+    eprintln!("Parse Error !");
+    eprintln!("{}", content.as_ref().trim());
+    exit(1);
+}
+
+macro_rules! line {
+    ($line:expr, $N:expr) => {
+        if $line + $N <= 0 {
+            " ".to_string()
+        } else {
+            ($line + $N).to_string()
+        }
+    };
+}
+
+pub fn print_syntax_error(content: String, reason: String, line: i64, begin: i64, end: i64) {
+    let content_len = content.width() as i64;
+    let end = end.clamp(begin, content_len);
+
+    eprintln!("{}", "Parse Failed: Syntax Error".bright_yellow());
+    eprintln!("{}{}", line!(line, -1), "|");
+
+    let before: String = content.chars().take(begin.max(0) as usize).collect();
+    let highlight_len = (end - begin).max(1) as usize;
+    let highlight: String = content
+        .chars()
+        .skip(begin.max(0) as usize)
+        .take(highlight_len)
+        .collect();
+    let after: String = content
+        .chars()
+        .skip((begin.max(0) + highlight_len as i64) as usize)
+        .collect();
+
+    eprintln!(
+        "{}{} {}{}{}",
+        line.to_string().cyan(),
+        "|".cyan(),
+        before.cyan(),
+        highlight.bright_cyan(),
+        after.cyan()
+    );
+
+    let prefix_chars: String = content.chars().take(begin.max(0) as usize).collect();
+    let prefix_width = prefix_chars.width() as usize;
+
+    eprintln!(
+        "{}{} {}",
+        line!(line, 1),
+        "|",
+        format!(
+            "{}{}____ {}",
+            " ".repeat(prefix_width),
+            "^".repeat(((end - begin).max(1)) as usize),
+            reason
+        )
+        .bright_cyan()
+    );
+    eprintln!("{}{}", line!(line, 2), "|");
+    eprintln!(
+        "{}",
+        "Please fix the issue and run the program again".bright_yellow()
+    );
+    exit(1);
+}