Fix error reporting caret

Whenever an error is reported along with a source location, a caret (^)
is placed beneath the origin of error. It was misplaced in a lot of
cases, because the lexer was only storing the source line from first
non-whitespace character.

Author: weirdsmiley

src/error.rs

@@ -252,13 +252,14 @@ impl QccErrorLoc {
         let row = self.1.borrow().row().to_string();
         let mut col = self.1.borrow().col();
 
-        let src_fmt = format!("\t{}\t{}", row, src);
+        let src_fmt = format!("        {} | {}", row, src);
 
         eprintln!("{}", self);
         eprint!("{src_fmt}");
 
-        col += 1 + row.len(); // +2 for inserted tabs, -1 for starting index
-                              // with 1, effectively +1
+        // +11 for chars for manual inserted whitespces in src_fmt, +length of
+        // row number, row is always > 0, in parse() it is initialized as (1,1)
+        col += 11 + row.len().ilog10() as usize;
 
         for c in src_fmt.chars() {
             if col > 0 {

src/lexer.rs

@@ -65,7 +65,7 @@ impl fmt::Debug for Location {
 /// `Pointer` is a movable reference into a buffer.
 #[derive(Debug)]
 pub(crate) struct Pointer {
-    /// start of the line, as seen in source, points first non-whitespace char
+    /// start of the line, as seen in source, points first char
     start: usize,
     /// index at previous recognized token
     prev: usize,
@@ -424,10 +424,6 @@ Please report this bug to {}",
 
                 return Some(());
             }
-            // Move Ptr::start to first non-whitespace char.
-            if self.buffer[self.ptr.start].is_ascii_whitespace() {
-                self.ptr.start += 1;
-            }
             self.ptr.end += 1;
         }
         self.ptr.end += 1;