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Commit 1b9734b9 authored by Robert Griesemer's avatar Robert Griesemer
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1) Fix a problem with tabwriter.Flush: any pending text not yet 

   in a cell makes a final cell in that line
   (this showed up as occasionally missing single spaces in
   godoc-formatted declarations that fit on a single line)

2) Cleaned up tabwriter implementation a bit:
   - replaced local unicodeLen() with utf8.RuneCount()
   - instead of having 2 parallel arrays for line widths and sizes,
     have a single array of cells containing a width and size
   - factored code a bit better
   - added more comments
   - added testnames to tabwriter tests
   - added more test cases and fixed a broken test case that
     now works correctly

R=r
DELTA=279  (133 added, 62 deleted, 84 changed)
OCL=30509
CL=30514
parent 5eb5d4d3
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Inline Side-by-side
Showing with 55 additions and 17 deletions
src/pkg/tabwriter/tabwriter.go
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src/pkg/tabwriter/tabwriter_test.go
View file @ 1b9734b9
......@@ -47,31 +47,31 @@ func (b *buffer) String() string {
}
func write(t *testing.T, w *tabwriter.Writer, src string) {
func write(t *testing.T, testname string, w *tabwriter.Writer, src string) {
written, err := io.WriteString(w, src);
if err != nil {
t.Errorf("--- src:\n%s\n--- write error: %v\n", src, err);
t.Errorf("--- test: %s\n--- src:\n%s\n--- write error: %v\n", testname, src, err);
}
if written != len(src) {
t.Errorf("--- src:\n%s\n--- written = %d, len(src) = %d\n", src, written, len(src));
t.Errorf("--- test: %s\n--- src:\n%s\n--- written = %d, len(src) = %d\n", testname, src, written, len(src));
}
}
func verify(t *testing.T, w *tabwriter.Writer, b *buffer, src, expected string) {
func verify(t *testing.T, testname string, w *tabwriter.Writer, b *buffer, src, expected string) {
err := w.Flush();
if err != nil {
t.Errorf("--- src:\n%s\n--- flush error: %v\n", src, err);
t.Errorf("--- test: %s\n--- src:\n%s\n--- flush error: %v\n", testname, src, err);
}
res := b.String();
if res != expected {
t.Errorf("--- src:\n%s\n--- found:\n%s\n--- expected:\n%s\n", src, res, expected)
t.Errorf("--- test: %s\n--- src:\n%s\n--- found:\n%s\n--- expected:\n%s\n", testname, src, res, expected)
}
}
func check(t *testing.T, tabwidth, padding int, padchar byte, flags uint, src, expected string) {
func check(t *testing.T, testname string, tabwidth, padding int, padchar byte, flags uint, src, expected string) {
var b buffer;
b.init(1000);
......@@ -80,30 +80,31 @@ func check(t *testing.T, tabwidth, padding int, padchar byte, flags uint, src, e
// write all at once
b.clear();
write(t, &w, src);
verify(t, &w, &b, src, expected);
write(t, testname, &w, src);
verify(t, testname, &w, &b, src, expected);
// write byte-by-byte
b.clear();
for i := 0; i < len(src); i++ {
write(t, &w, src[i : i+1]);
write(t, testname, &w, src[i : i+1]);
}
verify(t, &w, &b, src, expected);
verify(t, testname, &w, &b, src, expected);
// write using Fibonacci slice sizes
b.clear();
for i, d := 0, 0; i < len(src); {
write(t, &w, src[i : i+d]);
write(t, testname, &w, src[i : i+d]);
i, d = i+d, d+1;
if i+d > len(src) {
d = len(src) - i;
}
}
verify(t, &w, &b, src, expected);
verify(t, testname, &w, &b, src, expected);
}
type entry struct {
testname string;
tabwidth, padding int;
padchar byte;
flags uint;
......@@ -113,108 +114,133 @@ type entry struct {
var tests = []entry {
entry{
"1",
8, 1, '.', 0,
"",
""
},
entry{
"2",
8, 1, '.', 0,
"\n\n\n",
"\n\n\n"
},
entry{
"3",
8, 1, '.', 0,
"a\nb\nc",
"a\nb\nc"
},
entry{
"4a",
8, 1, '.', 0,
"\t", // '\t' terminates an empty cell on last line - nothing to print
""
},
entry{
"4b",
8, 1, '.', tabwriter.AlignRight,
"\t", // '\t' terminates an empty cell on last line - nothing to print
""
},
entry{
"5",
8, 1, '.', 0,
"*\t*",
"**"
"*.......*"
},
entry{
"5b",
8, 1, '.', 0,
"*\t*\n",
"*.......*\n"
},
entry{
"5c",
8, 1, '.', 0,
"*\t*\t",
"*.......*"
},
entry{
"5d",
8, 1, '.', tabwriter.AlignRight,
"*\t*\t",
".......**"
},
entry{
"6",
8, 1, '.', 0,
"\t\n",
"........\n"
},
entry{
"7a",
8, 1, '.', 0,
"a) foo",
"a) foo"
},
entry{
"7b",
8, 1, ' ', 0,
"b) foo\tbar", // "bar" is not in any cell - not formatted, just flushed
"b) foobar"
"b) foo\tbar",
"b) foo bar"
},
entry{
"7c",
8, 1, '.', 0,
"c) foo\tbar\t",
"c) foo..bar"
},
entry{
"7d",
8, 1, '.', 0,
"d) foo\tbar\n",
"d) foo..bar\n"
},
entry{
"7e",
8, 1, '.', 0,
"e) foo\tbar\t\n",
"e) foo..bar.....\n"
},
entry{
"7f",
8, 1, '.', tabwriter.FilterHTML,
"f) f&lt;o\t<b>bar</b>\t\n",
"f) f&lt;o..<b>bar</b>.....\n"
},
entry{
"7g",
8, 1, '.', tabwriter.FilterHTML,
"g) f&lt;o\t<b>bar</b>\t non-terminated entity &amp",
"g) f&lt;o..<b>bar</b>..... non-terminated entity &amp"
},
entry{
"8",
8, 1, '*', 0,
"Hello, world!\n",
"Hello, world!\n"
},
entry{
"9a",
0, 0, '.', 0,
"1\t2\t3\t4\n"
"11\t222\t3333\t44444\n",
......@@ -224,6 +250,7 @@ var tests = []entry {
},
entry{
"9b",
0, 0, '.', tabwriter.FilterHTML,
"1\t2<!---\f--->\t3\t4\n" // \f inside HTML is ignored
"11\t222\t3333\t44444\n",
......@@ -233,6 +260,7 @@ var tests = []entry {
},
entry{
"9c",
0, 0, '.', 0,
"1\t2\t3\t4\f" // \f causes a newline and flush
"11\t222\t3333\t44444\n",
......@@ -242,18 +270,21 @@ var tests = []entry {
},
entry{
"10a",
5, 0, '.', 0,
"1\t2\t3\t4\n",
"1....2....3....4\n"
},
entry{
"10b",
5, 0, '.', 0,
"1\t2\t3\t4\t\n",
"1....2....3....4....\n"
},
entry{
"11",
8, 1, '.', 0,
"本\tb\tc\n"
"aa\t\u672c\u672c\u672c\tcccc\tddddd\n"
......@@ -265,6 +296,7 @@ var tests = []entry {
},
entry{
"12a",
8, 1, ' ', tabwriter.AlignRight,
"a\tè\tc\t\n"
"aa\tèèè\tcccc\tddddd\t\n"
......@@ -276,6 +308,7 @@ var tests = []entry {
},
entry{
"12b",
2, 0, ' ', 0,
"a\tb\tc\n"
"aa\tbbb\tcccc\n"
......@@ -287,6 +320,7 @@ var tests = []entry {
},
entry{
"12c",
8, 1, '_', 0,
"a\tb\tc\n"
"aa\tbbb\tcccc\n"
......@@ -298,6 +332,7 @@ var tests = []entry {
},
entry{
"13a",
4, 1, '-', 0,
"4444\t日本語\t22\t1\t333\n"
"999999999\t22\n"
......@@ -317,6 +352,7 @@ var tests = []entry {
},
entry{
"13b",
4, 3, '.', 0,
"4444\t333\t22\t1\t333\n"
"999999999\t22\n"
......@@ -336,6 +372,7 @@ var tests = []entry {
},
entry{
"13c",
8, 1, '\t', tabwriter.FilterHTML,
"4444\t333\t22\t1\t333\n"
"999999999\t22\n"
......@@ -355,6 +392,7 @@ var tests = []entry {
},
entry{
"14",
0, 2, ' ', tabwriter.AlignRight,
".0\t.3\t2.4\t-5.1\t\n"
"23.0\t12345678.9\t2.4\t-989.4\t\n"
......@@ -375,6 +413,6 @@ var tests = []entry {
func Test(t *testing.T) {
for _, e := range tests {
check(t, e.tabwidth, e.padding, e.padchar, e.flags, e.src, e.expected);
check(t, e.testname, e.tabwidth, e.padding, e.padchar, e.flags, e.src, e.expected);
}
}
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