t/450-api/100-inline.t - metacpan.org

#!perl -w
#
# this tests both the Inline interface and the API
use strict;
use Test::More;
use Imager::Test qw(is_color3 is_color4);
eval "require Inline::C;";
plan skip_all => "Inline required for testing API" if $@;

eval "require Parse::RecDescent;";
plan skip_all => "Could not load Parse::RecDescent" if $@;

use Cwd 'getcwd';
plan skip_all => "Inline won't work in directories with spaces"
  if getcwd() =~ / /;

plan skip_all => "perl 5.005_04, 5.005_05 too buggy"
  if $] =~ /^5\.005_0[45]$/;

-d "testout" or mkdir "testout";

print STDERR "Inline version $Inline::VERSION\n";

plan tests => 117;
require Inline;
Inline->import(with => 'Imager');
Inline->import("FORCE"); # force rebuild
#Inline->import(C => Config => OPTIMIZE => "-g");

Inline->bind(C => <<'EOS');
#include <math.h>

int pixel_count(Imager::ImgRaw im) {
  return im->xsize * im->ysize;
}

int count_color(Imager::ImgRaw im, Imager::Color c) {
  int count = 0, x, y, chan;
  i_color read_c;

  for (x = 0; x < im->xsize; ++x) {
    for (y = 0; y < im->ysize; ++y) {
      int match = 1;
      i_gpix(im, x, y, &read_c);
      for (chan = 0; chan < im->channels; ++chan) {
        if (read_c.channel[chan] != c->channel[chan]) {
          match = 0;
          break;
        }
      }
      if (match)
        ++count;
    }
  }

  return count;
}

Imager make_10x10() {
  i_img *im = i_img_8_new(10, 10, 3);
  i_color c;
  c.channel[0] = c.channel[1] = c.channel[2] = 255;
  i_box_filled(im, 0, 0, im->xsize-1, im->ysize-1, &c);

  return im;
}

/* tests that all of the APIs are visible - most of them anyway */
Imager do_lots(Imager src) {
  i_img *im = i_img_8_new(100, 100, 3);
  i_img *fill_im = i_img_8_new(5, 5, 3);
  i_img *testim;
  i_color red, blue, green, black, temp_color;
  i_fcolor redf, bluef;
  i_fill_t *hatch, *fhatch_fill;
  i_fill_t *im_fill;
  i_fill_t *solid_fill, *fsolid_fill;
  i_fill_t *fount_fill;
  void *block;
  double matrix[9] = /* 30 degree rotation */
    {
      0.866025,  -0.5,      0, 
      0.5,       0.866025,  0, 
      0,         0,         1,      
    };
  i_fountain_seg fseg;
  i_img_tags tags;
  int entry;
  double temp_double;

  red.channel[0] = 255; red.channel[1] = 0; red.channel[2] = 0;
  red.channel[3] = 255;
  blue.channel[0] = 0; blue.channel[1] = 0; blue.channel[2] = 255;
  blue.channel[3] = 255;
  green.channel[0] = 0; green.channel[1] = 255; green.channel[2] = 0;
  green.channel[3] = 255;
  black.channel[0] = black.channel[1] = black.channel[2] = 0;
  black.channel[3] = 255;
  hatch = i_new_fill_hatch(&red, &blue, 0, 1, NULL, 0, 0);

  i_box(im, 0, 0, 9, 9, &red);
  i_box_filled(im, 10, 0, 19, 9, &blue);
  i_box_cfill(im, 20, 0, 29, 9, hatch);

  /* make an image fill, and try it */
  i_box_cfill(fill_im, 0, 0, 4, 4, hatch);
  im_fill = i_new_fill_image(fill_im, matrix, 2, 2, 0);

  i_box_cfill(im, 30, 0, 39, 9, im_fill);

  /* make a solid fill and try it */
  solid_fill = i_new_fill_solid(&red, 0);
  i_box_cfill(im, 40, 0, 49, 9, solid_fill);

  /* floating fills */
  redf.channel[0] = 1.0; redf.channel[1] = 0; redf.channel[2] = 0;
  redf.channel[3] = 1.0;
  bluef.channel[0] = 0; bluef.channel[1] = 0; bluef.channel[2] = 1.0;
  bluef.channel[3] = 1.0;

  fsolid_fill = i_new_fill_solidf(&redf, 0);
  i_box_cfill(im, 50, 0, 59, 9, fsolid_fill);
 
  fhatch_fill = i_new_fill_hatchf(&redf, &bluef, 0, 2, NULL, 0, 0);
  i_box_cfill(im, 60, 0, 69, 9, fhatch_fill);

  /* fountain fill */
  fseg.start = 0;
  fseg.middle = 0.5;
  fseg.end = 1.0;
  fseg.c[0] = redf;
  fseg.c[1] = bluef;
  fseg.type = i_fst_linear;
  fseg.color = i_fc_hue_down;
  fount_fill = i_new_fill_fount(70, 0, 80, 0, i_ft_linear, i_fr_triangle, 0, i_fts_none, 1, 1, &fseg);

  i_box_cfill(im, 70, 0, 79, 9, fount_fill);

  i_line(im, 0, 10, 10, 15, &blue, 1);
  i_line_aa(im, 0, 19, 10, 15, &red, 1);
  
  i_arc(im, 15, 15, 4, 45, 160, &blue);
  i_arc_aa(im, 25, 15, 4, 75, 280, &red);
  i_arc_cfill(im, 35, 15, 4, 0, 215, hatch);
  i_arc_aa_cfill(im, 45, 15, 4, 30, 210, hatch);
  i_circle_aa(im, 55, 15, 4, &red);
  
  i_box(im, 61, 11, 68, 18, &red);
  i_flood_fill(im, 65, 15, &blue);
  i_box(im, 71, 11, 78, 18, &red);
  i_flood_cfill(im, 75, 15, hatch);

  i_box_filled(im, 1, 21, 9, 24, &red);
  i_box_filled(im, 1, 25, 9, 29, &blue);
  i_flood_fill_border(im, 5, 25, &green, &black);

  i_box_filled(im, 11, 21, 19, 24, &red);
  i_box_filled(im, 11, 25, 19, 29, &blue);
  i_flood_cfill_border(im, 15, 25, hatch, &black);

  i_fill_destroy(fount_fill);
  i_fill_destroy(fhatch_fill);
  i_fill_destroy(solid_fill);
  i_fill_destroy(fsolid_fill);
  i_fill_destroy(hatch);
  i_fill_destroy(im_fill);
  i_img_destroy(fill_im);

  /* make sure we can make each image type */
  testim = i_img_16_new(100, 100, 3);
  i_img_destroy(testim);
  testim = i_img_double_new(100, 100, 3);
  i_img_destroy(testim);
  testim = i_img_pal_new(100, 100, 3, 256);
  i_img_destroy(testim);
  testim = i_sametype(im, 50, 50);
  i_img_destroy(testim);
  testim = i_sametype_chans(im, 50, 50, 4);
  i_img_destroy(testim);

  i_clear_error();
  i_push_error(0, "Hello");
  i_push_errorf(0, "%s", "World");

  /* make sure tags create/destroy work */
  i_tags_new(&tags);
  i_tags_destroy(&tags);  

  block = mymalloc(20);
  block = myrealloc(block, 50);
  myfree(block);

  i_tags_set(&im->tags, "lots_string", "foo", -1);
  i_tags_setn(&im->tags, "lots_number", 101);

  if (!i_tags_find(&im->tags, "lots_number", 0, &entry)) {
    i_push_error(0, "lots_number tag not found");
    i_img_destroy(im);
    return NULL;
  }
  i_tags_delete(&im->tags, entry);

  /* these won't delete anything, but it makes sure the macros and function
     pointers are correct */
  i_tags_delbyname(&im->tags, "unknown");
  i_tags_delbycode(&im->tags, 501);
  i_tags_set_float(&im->tags, "lots_float", 0, 3.14);
  if (!i_tags_get_float(&im->tags, "lots_float", 0, &temp_double)) {
    i_push_error(0, "lots_float not found");
    i_img_destroy(im);
    return NULL;
  }
  if (fabs(temp_double - 3.14) > 0.001) {
    i_push_errorf(0, "lots_float incorrect %g", temp_double);
    i_img_destroy(im);
    return NULL;
  }
  i_tags_set_float2(&im->tags, "lots_float2", 0, 100 * sqrt(2.0), 5);
  if (!i_tags_get_int(&im->tags, "lots_float2", 0, &entry)) {
    i_push_error(0, "lots_float2 not found as int");
    i_img_destroy(im);
    return NULL;
  }
  if (entry != 141) { 
    i_push_errorf(0, "lots_float2 unexpected value %d", entry);
    i_img_destroy(im);
    return NULL;
  }

  i_tags_set_color(&im->tags, "lots_color", 0, &red);
  if (!i_tags_get_color(&im->tags, "lots_color", 0, &temp_color)) {
    i_push_error(0, "lots_color not found as color");
    i_img_destroy(im);
    return NULL;
  }
    
  return im;
}

void
io_fd(int fd) {
  Imager::IO io = io_new_fd(fd);
  i_io_write(io, "test", 4);
  i_io_close(io);
  io_glue_destroy(io);
}

int
io_bufchain_test() {
  Imager::IO io = io_new_bufchain();
  unsigned char *result;
  size_t size;
  if (i_io_write(io, "test2", 5) != 5) {
    fprintf(stderr, "write failed\n");
    return 0;
  }
  if (!i_io_flush(io)) {
    fprintf(stderr, "flush failed\n");
    return 0;
  }
  if (i_io_close(io) != 0) {
    fprintf(stderr, "close failed\n");
    return 0;
  }
  size = io_slurp(io, &result);
  if (size != 5) {
    fprintf(stderr, "wrong size\n");
    return 0;
  }
  if (memcmp(result, "test2", 5)) {
    fprintf(stderr, "data mismatch\n");
    return 0;
  }
  if (i_io_seek(io, 0, 0) != 0) {
    fprintf(stderr, "seek failure\n");
    return 0;
  }
  myfree(result);
  io_glue_destroy(io);

  return 1;
}

const char *
io_buffer_test(SV *in) {
  STRLEN len;
  const char *in_str = SvPV(in, len);
  static char buf[100];
  Imager::IO io = io_new_buffer(in_str, len, NULL, NULL);
  ssize_t read_size;

  read_size = i_io_read(io, buf, sizeof(buf)-1);
  io_glue_destroy(io);
  if (read_size < 0 || read_size >= sizeof(buf)) {
    return "";
  }

  buf[read_size] = '\0';

  return buf;
}

const char *
io_peekn_test(SV *in) {
  STRLEN len;
  const char *in_str = SvPV(in, len);
  static char buf[100];
  Imager::IO io = io_new_buffer(in_str, len, NULL, NULL);
  ssize_t read_size;

  read_size = i_io_peekn(io, buf, sizeof(buf)-1);
  io_glue_destroy(io);
  if (read_size < 0 || read_size >= sizeof(buf)) {
    return "";
  }

  buf[read_size] = '\0';

  return buf;
}

const char *
io_gets_test(SV *in) {
  STRLEN len;
  const char *in_str = SvPV(in, len);
  static char buf[100];
  Imager::IO io = io_new_buffer(in_str, len, NULL, NULL);
  ssize_t read_size;

  read_size = i_io_gets(io, buf, sizeof(buf), 's');
  io_glue_destroy(io);
  if (read_size < 0 || read_size >= sizeof(buf)) {
    return "";
  }

  return buf;
}

int
io_getc_test(SV *in) {
  STRLEN len;
  const char *in_str = SvPV(in, len);
  static char buf[100];
  Imager::IO io = io_new_buffer(in_str, len, NULL, NULL);
  int result;

  result = i_io_getc(io);
  io_glue_destroy(io);

  return result;
}

int
io_peekc_test(SV *in) {
  STRLEN len;
  const char *in_str = SvPV(in, len);
  static char buf[100];
  Imager::IO io = io_new_buffer(in_str, len, NULL, NULL);
  int result;

  i_io_set_buffered(io, 0);

  result = i_io_peekc(io);
  io_glue_destroy(io);

  return result;
}



int
test_render_color(Imager work_8) {
  i_render *r8;
  i_color c;
  unsigned char render_coverage[3];

  render_coverage[0] = 0;
  render_coverage[1] = 128;
  render_coverage[2] = 255;

  r8 = i_render_new(work_8, 10);
  c.channel[0] = 128;
  c.channel[1] = 255;
  c.channel[2] = 0;
  c.channel[3] = 255;
  i_render_color(r8, 0, 0, sizeof(render_coverage), render_coverage, &c);

  c.channel[3] = 128;
  i_render_color(r8, 0, 1, sizeof(render_coverage), render_coverage, &c);

  c.channel[3] = 0;
  i_render_color(r8, 0, 2, sizeof(render_coverage), render_coverage, &c);

  i_render_delete(r8);

  return 1;
}

int
raw_psamp(Imager im, int chan_count) {
  static i_sample_t samps[] = { 0, 127, 255 };

  i_clear_error();
  return i_psamp(im, 0, 1, 0, samps, NULL, chan_count);
}

int
raw_psampf(Imager im, int chan_count) {
  static i_fsample_t samps[] = { 0, 0.5, 1.0 };

  i_clear_error();
  return i_psampf(im, 0, 1, 0, samps, NULL, chan_count);
}

int
test_mutex() {
  i_mutex_t m;

  m = i_mutex_new();
  i_mutex_lock(m);
  i_mutex_unlock(m);
  i_mutex_destroy(m);

  return 1;
}

int
test_slots() {
  im_slot_t slot = im_context_slot_new(NULL);

  if (im_context_slot_get(aIMCTX, slot)) {
    fprintf(stderr, "slots should default to NULL\n");
    return 0;
  }
  if (!im_context_slot_set(aIMCTX, slot, &slot)) {
    fprintf(stderr, "set slot failed\n");
    return 0;
  }

  if (im_context_slot_get(aIMCTX, slot) != &slot) {
    fprintf(stderr, "get slot didn't match\n");
    return 0;
  }

  return 1;
}

EOS

my $im = Imager->new(xsize=>50, ysize=>50);
is(pixel_count($im), 2500, "pixel_count");

my $black = Imager::Color->new(0,0,0);
is(count_color($im, $black), 2500, "count_color black on black image");

my $im2 = make_10x10();
my $white = Imager::Color->new(255, 255, 255);
is(count_color($im2, $white), 100, "check new image white count");
ok($im2->box(filled=>1, xmin=>1, ymin=>1, xmax => 8, ymax=>8, color=>$black),
   "try new image");
is(count_color($im2, $black), 64, "check modified black count");
is(count_color($im2, $white), 36, "check modified white count");

my $im3 = do_lots($im2);
ok($im3, "do_lots()")
  or print "# ", Imager->_error_as_msg, "\n";
ok($im3->write(file=>'testout/t82lots.ppm'), "write t82lots.ppm");

{ # RT #24992
  # the T_IMAGER_FULL_IMAGE typemap entry was returning a blessed
  # hash with an extra ref, causing memory leaks

  my $im = make_10x10();
  my $im2 = Imager->new(xsize => 10, ysize => 10);
  require B;
  my $imb = B::svref_2object($im);
  my $im2b = B::svref_2object($im2);
  is ($imb->REFCNT, $im2b->REFCNT, 
      "check refcnt of imager object hash between normal and typemap generated");
}

SKIP:
{
  use IO::File;
  my $fd_filename = "testout/t82fd.txt";
  {
    my $fh = IO::File->new($fd_filename, "w")
      or skip("Can't create file: $!", 1);
    io_fd(fileno($fh));
    $fh->close;
  }
  {
    my $fh = IO::File->new($fd_filename, "r")
      or skip("Can't open file: $!", 1);
    my $data = <$fh>;
    is($data, "test", "make sure data written to fd");
  }
  unlink $fd_filename;
}

ok(io_bufchain_test(), "check bufchain functions");

is(io_buffer_test("test3"), "test3", "check io_new_buffer() and i_io_read");

is(io_peekn_test("test5"), "test5", "check i_io_peekn");

is(io_gets_test("test"), "tes", "check i_io_gets()");

is(io_getc_test("ABC"), ord "A", "check i_io_getc(_imp)?");

is(io_getc_test("XYZ"), ord "X", "check i_io_peekc(_imp)?");

for my $bits (8, 16) {
  print "# bits: $bits\n";

  # the floating point processing is a little more accurate
  my $bump = $bits == 16 ? 1 : 0;
  {
    my $im = Imager->new(xsize => 10, ysize => 10, channels => 3, bits => $bits);
    ok($im->box(filled => 1, color => '#808080'), "fill work image with gray");
    ok(test_render_color($im),
       "call render_color on 3 channel image");
    is_color3($im->getpixel(x => 0, y => 0), 128, 128, 128,
	      "check zero coverage, alpha 255 color, bits $bits");
    is_color3($im->getpixel(x => 1, y => 0), 128, 191+$bump, 63+$bump,
	      "check 128 coverage, alpha 255 color, bits $bits");
    is_color3($im->getpixel(x => 2, y => 0), 128, 255, 0,
	      "check 255 coverage, alpha 255 color, bits $bits");

    is_color3($im->getpixel(x => 0, y => 1), 128, 128, 128,
	      "check zero coverage, alpha 128 color, bits $bits");
    is_color3($im->getpixel(x => 1, y => 1), 128, 159+$bump, 95+$bump,
	      "check 128 coverage, alpha 128 color, bits $bits");
    is_color3($im->getpixel(x => 2, y => 1), 128, 191+$bump, 63+$bump,
	      "check 255 coverage, alpha 128 color, bits $bits");

    is_color3($im->getpixel(x => 0, y => 2), 128, 128, 128,
	      "check zero coverage, alpha 0 color, bits $bits");
    is_color3($im->getpixel(x => 1, y => 2), 128, 128, 128,
	      "check 128 coverage, alpha 0 color, bits $bits");
    is_color3($im->getpixel(x => 2, y => 2), 128, 128, 128,
	      "check 255 coverage, alpha 0 color, bits $bits");
  }
  {
    my $im = Imager->new(xsize => 10, ysize => 10, channels => 4, bits => $bits);
    ok($im->box(filled => 1, color => '#808080'), "fill work image with opaque gray");
    ok(test_render_color($im),
       "call render_color on 4 channel image");
    is_color4($im->getpixel(x => 0, y => 0), 128, 128, 128, 255,
	      "check zero coverage, alpha 255 color, bits $bits");
    is_color4($im->getpixel(x => 1, y => 0), 128, 191+$bump, 63+$bump, 255,
	      "check 128 coverage, alpha 255 color, bits $bits");
    is_color4($im->getpixel(x => 2, y => 0), 128, 255, 0, 255,
	      "check 255 coverage, alpha 255 color, bits $bits");

    is_color4($im->getpixel(x => 0, y => 1), 128, 128, 128, 255,
	      "check zero coverage, alpha 128 color, bits $bits");
    is_color4($im->getpixel(x => 1, y => 1), 128, 159+$bump, 95+$bump, 255,
	      "check 128 coverage, alpha 128 color, bits $bits");
    is_color4($im->getpixel(x => 2, y => 1), 128, 191+$bump, 63+$bump, 255,
	      "check 255 coverage, alpha 128 color, bits $bits");

    is_color4($im->getpixel(x => 0, y => 2), 128, 128, 128, 255,
	      "check zero coverage, alpha 0 color, bits $bits");
    is_color4($im->getpixel(x => 1, y => 2), 128, 128, 128, 255,
	      "check 128 coverage, alpha 0 color, bits $bits");
    is_color4($im->getpixel(x => 2, y => 2), 128, 128, 128, 255,
	      "check 255 coverage, alpha 0 color, bits $bits");
  }

  {
    my $im = Imager->new(xsize => 10, ysize => 10, channels => 4, bits => $bits);
    ok($im->box(filled => 1, color => Imager::Color->new(128, 128, 128, 64)), "fill work image with translucent gray");
    ok(test_render_color($im),
       "call render_color on 4 channel image");
    is_color4($im->getpixel(x => 0, y => 0), 128, 128, 128, 64,
	      "check zero coverage, alpha 255 color, bits $bits");
    is_color4($im->getpixel(x => 1, y => 0), 128, 230, 25+$bump, 159+$bump,
	      "check 128 coverage, alpha 255 color, bits $bits");
    is_color4($im->getpixel(x => 2, y => 0), 128, 255, 0, 255,
	      "check 255 coverage, alpha 255 color, bits $bits");

    is_color4($im->getpixel(x => 0, y => 1), 128, 128, 128, 64,
	      "check zero coverage, alpha 128 color, bits $bits");
    is_color4($im->getpixel(x => 1, y => 1), 129-$bump, 202-$bump, 55, 111+$bump,
	      "check 128 coverage, alpha 128 color, bits $bits");
    is_color4($im->getpixel(x => 2, y => 1), 128, 230, 25+$bump, 159+$bump,
	      "check 255 coverage, alpha 128 color, bits $bits");

    is_color4($im->getpixel(x => 0, y => 2), 128, 128, 128, 64,
	      "check zero coverage, alpha 0 color, bits $bits");
    is_color4($im->getpixel(x => 1, y => 2), 128, 128, 128, 64,
	      "check 128 coverage, alpha 0 color, bits $bits");
    is_color4($im->getpixel(x => 2, y => 2), 128, 128, 128, 64,
	      "check 255 coverage, alpha 0 color, bits $bits");
  }
}

{
  my $im = Imager->new(xsize => 10, ysize => 10);
  is(raw_psamp($im, 4), -1, "bad channel list (4) for psamp should fail");
  is(_get_error(), "chan_count 4 out of range, must be >0, <= channels",
     "check message");
  is(raw_psamp($im, 0), -1, "bad channel list (0) for psamp should fail");
  is(_get_error(), "chan_count 0 out of range, must be >0, <= channels",
     "check message");
  is(raw_psampf($im, 4), -1, "bad channel list (4) for psampf should fail");
  is(_get_error(), "chan_count 4 out of range, must be >0, <= channels",
     "check message");
  is(raw_psampf($im, 0), -1, "bad channel list (0) for psampf should fail");
  is(_get_error(), "chan_count 0 out of range, must be >0, <= channels",
     "check message");
}

{
  my $im = Imager->new(xsize => 10, ysize => 10, bits => 16);
  is(raw_psamp($im, 4), -1, "bad channel list (4) for psamp should fail (16-bit)");
  is(_get_error(), "chan_count 4 out of range, must be >0, <= channels",
     "check message");
  is(raw_psamp($im, 0), -1, "bad channel list (0) for psamp should fail (16-bit)");
  is(_get_error(), "chan_count 0 out of range, must be >0, <= channels",
     "check message");
  is(raw_psampf($im, 4), -1, "bad channel list (4) for psampf should fail (16-bit)");
  is(_get_error(), "chan_count 4 out of range, must be >0, <= channels",
     "check message");
  is(raw_psampf($im, 0), -1, "bad channel list (0) for psampf should fail (16-bit)");
  is(_get_error(), "chan_count 0 out of range, must be >0, <= channels",
     "check message");
}

{
  my $im = Imager->new(xsize => 10, ysize => 10, bits => 'double');
  is(raw_psamp($im, 4), -1, "bad channel list (4) for psamp should fail (double)");
  is(_get_error(), "chan_count 4 out of range, must be >0, <= channels",
     "check message");
  is(raw_psamp($im, 0), -1,, "bad channel list (0) for psamp should fail (double)");
  is(_get_error(), "chan_count 0 out of range, must be >0, <= channels",
     "check message");
  is(raw_psampf($im, 4), -1, "bad channel list (4) for psampf should fail (double)");
  is(_get_error(), "chan_count 4 out of range, must be >0, <= channels",
     "check message");
  is(raw_psampf($im, 0), -1, "bad channel list (0) for psampf should fail (double)");
  is(_get_error(), "chan_count 0 out of range, must be >0, <= channels",
     "check message");
}

{
  my $im = Imager->new(xsize => 10, ysize => 10, type => "paletted");
  is(raw_psamp($im, 4), -1, "bad channel list (4) for psamp should fail (paletted)");
  is(_get_error(), "chan_count 4 out of range, must be >0, <= channels",
     "check message");
  is(raw_psamp($im, 0), -1, "bad channel list (0) for psamp should fail (paletted)");
  is(_get_error(), "chan_count 0 out of range, must be >0, <= channels",
     "check message");
  is(raw_psampf($im, 4), -1, "bad channel list (4) for psampf should fail (paletted)");
  is(_get_error(), "chan_count 4 out of range, must be >0, <= channels",
     "check message");
  is(raw_psampf($im, 0), -1, "bad channel list (0) for psampf should fail (paletted)");
  is(_get_error(), "chan_count 0 out of range, must be >0, <= channels",
     "check message");
  is($im->type, "paletted", "make sure we kept the image type");
}

ok(test_mutex(), "call mutex APIs");

ok(test_slots(), "call slot APIs");

sub _get_error {
  my @errors = Imager::i_errors();
  return join(": ", map $_->[0], @errors);
}
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