Merge commit 'aa9bc86125' into sync-from-ra

crates/ide-db/src/tests/line_index.rs

@@ -0,0 +1,49 @@
+use line_index::{LineCol, LineIndex, WideEncoding};
+use test_utils::skip_slow_tests;
+
+#[test]
+fn test_every_chars() {
+    if skip_slow_tests() {
+        return;
+    }
+
+    let text: String = {
+        let mut chars: Vec<char> = ((0 as char)..char::MAX).collect(); // Neat!
+        chars.extend("\n".repeat(chars.len() / 16).chars());
+        let mut rng = oorandom::Rand32::new(stdx::rand::seed());
+        stdx::rand::shuffle(&mut chars, |i| rng.rand_range(0..i as u32) as usize);
+        chars.into_iter().collect()
+    };
+    assert!(text.contains('💩')); // Sanity check.
+
+    let line_index = LineIndex::new(&text);
+
+    let mut lin_col = LineCol { line: 0, col: 0 };
+    let mut col_utf16 = 0;
+    let mut col_utf32 = 0;
+    for (offset, c) in text.char_indices() {
+        let got_offset = line_index.offset(lin_col).unwrap();
+        assert_eq!(usize::from(got_offset), offset);
+
+        let got_lin_col = line_index.line_col(got_offset);
+        assert_eq!(got_lin_col, lin_col);
+
+        for (enc, col) in [(WideEncoding::Utf16, col_utf16), (WideEncoding::Utf32, col_utf32)] {
+            let wide_lin_col = line_index.to_wide(enc, lin_col).unwrap();
+            let got_lin_col = line_index.to_utf8(enc, wide_lin_col).unwrap();
+            assert_eq!(got_lin_col, lin_col);
+            assert_eq!(wide_lin_col.col, col)
+        }
+
+        if c == '\n' {
+            lin_col.line += 1;
+            lin_col.col = 0;
+            col_utf16 = 0;
+            col_utf32 = 0;
+        } else {
+            lin_col.col += c.len_utf8() as u32;
+            col_utf16 += c.len_utf16() as u32;
+            col_utf32 += 1;
+        }
+    }
+}