rescale(currentScale * (e.deltaY < 0 ? 1.1 : (1/1.1)),
            toSvg(e.offsetX, e.offsetY));
  }

  function setMode(m) {
    mode = m;
    touchid = null;
    touchid2 = null;
  }

  function panStart(x, y) {
    moved = false;
    panLastX = x;
    panLastY = y;
  }

  function panMove(x, y) {
    let dx = x - panLastX;
    let dy = y - panLastY;

  public void testPadStart_noPadding() {
    assertSame("", Strings.padStart("", 0, '-'));
    assertSame("x", Strings.padStart("x", 0, '-'));
    assertSame("x", Strings.padStart("x", 1, '-'));
    assertSame("xx", Strings.padStart("xx", 0, '-'));
    assertSame("xx", Strings.padStart("xx", 2, '-'));
  }

  public void testPadStart_somePadding() {
    assertEquals("-", Strings.padStart("", 1, '-'));
    assertEquals("--", Strings.padStart("", 2, '-'));

   * with as many copies of {@code padChar} as are necessary to reach that length. For example,
   *
   * <ul>
   *   <li>{@code padStart("7", 3, '0')} returns {@code "007"}
   *   <li>{@code padStart("2010", 3, '0')} returns {@code "2010"}
   * </ul>
   *
   * <p>See {@link java.util.Formatter} for a richer set of formatting capabilities.
   *

   * with as many copies of {@code padChar} as are necessary to reach that length. For example,
   *
   * <ul>
   *   <li>{@code padStart("7", 3, '0')} returns {@code "007"}
   *   <li>{@code padStart("2010", 3, '0')} returns {@code "2010"}
   * </ul>
   *
   * <p>See {@link java.util.Formatter} for a richer set of formatting capabilities.
   *

		// are present in the user specified expression.
		var pinStart, pinEnd bool
		for _, prefix := range []string{"^", "//"} {
			if strings.Contains(regexpStr, prefix) {
				pinStart = true
				break
			}
		}
		for _, suffix := range []string{"$", ":"} {
			if strings.Contains(regexpStr, suffix) {
				pinEnd = true
				break
			}
		}
		if !pinStart || !pinEnd {

                separator = "\n$columnIndent  $indent"
            )
    }

    private
    fun lineNumber(location: CompilerMessageSourceLocation) =
        location.line.toString().padStart(maxLineNumberStringLength, '0')

    private
    fun prependIndent(it: String) = it.prependIndent(indent)

    private
    val errorPlural
        get() = if (errors.size > 1) "errors" else "error"