mirror of
https://github.com/golang/go
synced 2024-11-18 13:04:46 -07:00
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
This commit is contained in:
Robert Griesemer
parent
5eb5d4d3c0
commit
1b9734b995
@ -20,6 +20,16 @@ import (
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// ----------------------------------------------------------------------------
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// Filter implementation
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// A cell represents a segment of text delineated by tabs, form-feed,
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// or newline chars. The text itself is stored in a separate buffer;
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// cell only describes the segment's size in bytes and width in runes.
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//
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type cell struct {
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size int; // cell size in bytes
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width int; // cell width in runes
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}
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// A Writer is a filter that inserts padding around
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// tab-delimited columns in its input to align them
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// in the output.
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@ -37,8 +47,8 @@ import (
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// UTF-8 characters.
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//
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// If a Writer is configured to filter HTML, HTML tags and entities
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// are simply passed through and their widths are assumed to be zero
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// for formatting purposes.
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// are simply passed through. The widths of tags and entities are
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// assumed to be zero (tags) and one (entities) for formatting purposes.
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//
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// The form feed character ('\f') acts like a newline but it also
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// terminates all columns in the current line (effectively calling
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@ -59,22 +69,42 @@ type Writer struct {
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flags uint;
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// current state
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html_char byte; // terminating char of html tag/entity, or 0 ('>', ';', or 0)
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buf io.ByteBuffer; // collected text w/o tabs, newlines, or form feed chars
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size int; // size of incomplete cell in bytes
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width int; // width of incomplete cell in runes up to buf[pos] w/o ignored sections
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pos int; // buffer position up to which width of incomplete cell has been computed
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lines_size vector.Vector; // list of lines; each line is a list of cell sizes in bytes
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lines_width vector.Vector; // list of lines; each line is a list of cell widths in runes
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cell cell; // current incomplete cell; cell.width is up to buf[pos] w/o ignored sections
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html_char byte; // terminating char of html tag/entity, or 0 ('>', ';', or 0)
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lines vector.Vector; // list if lines; each line is a list of cells
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widths vector.IntVector; // list of column widths in runes - re-used during formatting
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}
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func (b *Writer) addLine() {
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b.lines.Push(vector.New(0));
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}
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func (b *Writer) line(i int) *vector.Vector {
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return b.lines.At(i).(*vector.Vector);
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}
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// Reset the current state.
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func (b *Writer) reset() {
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b.buf.Reset();
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b.pos = 0;
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b.cell = cell{};
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b.html_char = 0;
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b.lines.Init(0);
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b.widths.Init(0);
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b.addLine();
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}
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// Internal representation (current state):
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//
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// - all text written is appended to buf; form feed chars, tabs and newlines are stripped away
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// - at any given time there is a (possibly empty) incomplete cell at the end
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// (the cell starts after a tab or newline)
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// (the cell starts after a tab, form feed, or newline)
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// - size is the number of bytes belonging to the cell so far
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// - width is text width in runes of that cell from the start of the cell to
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// position pos; html tags and entities are excluded from this width if html
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@ -94,12 +124,6 @@ type Writer struct {
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// buf start of incomplete cell pos
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func (b *Writer) addLine() {
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b.lines_size.Push(vector.NewIntVector(0));
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b.lines_width.Push(vector.NewIntVector(0));
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}
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// Formatting can be controlled with these flags.
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const (
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// Ignore html tags and treat entities (starting with '&'
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@ -144,22 +168,12 @@ func (b *Writer) Init(output io.Writer, cellwidth, padding int, padchar byte, fl
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}
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b.flags = flags;
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b.lines_size.Init(0);
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b.lines_width.Init(0);
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b.widths.Init(0);
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b.addLine(); // the very first line
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b.reset();
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return b;
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}
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func (b *Writer) line(i int) (*vector.IntVector, *vector.IntVector) {
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return
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b.lines_size.At(i).(*vector.IntVector),
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b.lines_width.At(i).(*vector.IntVector);
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}
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// debugging support (keep code around)
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/*
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func (b *Writer) dump() {
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@ -219,19 +233,19 @@ func (b *Writer) writePadding(textw, cellw int) os.Error {
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func (b *Writer) writeLines(pos0 int, line0, line1 int) (int, os.Error) {
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pos := pos0;
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for i := line0; i < line1; i++ {
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line_size, line_width := b.line(i);
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for j := 0; j < line_size.Len(); j++ {
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s, w := line_size.At(j), line_width.At(j);
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line := b.line(i);
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for j := 0; j < line.Len(); j++ {
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c := line.At(j).(cell);
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switch {
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default: // align left
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if err := b.write0(b.buf.Data()[pos : pos + s]); err != nil {
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if err := b.write0(b.buf.Data()[pos : pos + c.size]); err != nil {
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return pos, err;
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}
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pos += s;
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pos += c.size;
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if j < b.widths.Len() {
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if err := b.writePadding(w, b.widths.At(j)); err != nil {
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if err := b.writePadding(c.width, b.widths.At(j)); err != nil {
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return pos, err;
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}
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}
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@ -239,24 +253,24 @@ func (b *Writer) writeLines(pos0 int, line0, line1 int) (int, os.Error) {
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case b.flags & AlignRight != 0: // align right
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if j < b.widths.Len() {
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if err := b.writePadding(w, b.widths.At(j)); err != nil {
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if err := b.writePadding(c.width, b.widths.At(j)); err != nil {
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return pos, err;
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}
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}
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if err := b.write0(b.buf.Data()[pos : pos + s]); err != nil {
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if err := b.write0(b.buf.Data()[pos : pos + c.size]); err != nil {
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return pos, err;
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}
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pos += s;
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pos += c.size;
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}
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}
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if i+1 == b.lines_size.Len() {
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if i+1 == b.lines.Len() {
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// last buffered line - we don't have a newline, so just write
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// any outstanding buffered data
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if err := b.write0(b.buf.Data()[pos : pos + b.size]); err != nil {
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if err := b.write0(b.buf.Data()[pos : pos + b.cell.size]); err != nil {
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return pos, err;
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}
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pos += b.size;
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pos += b.cell.size;
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} else {
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// not the last line - write newline
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if err := b.write0(newline); err != nil {
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@ -273,9 +287,9 @@ func (b *Writer) format(pos0 int, line0, line1 int) (pos int, err os.Error) {
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column := b.widths.Len();
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last := line0;
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for this := line0; this < line1; this++ {
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line_size, line_width := b.line(this);
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line := b.line(this);
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if column < line_size.Len() - 1 {
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if column < line.Len() - 1 {
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// cell exists in this column
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// (note that the last cell per line is ignored)
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@ -289,10 +303,10 @@ func (b *Writer) format(pos0 int, line0, line1 int) (pos int, err os.Error) {
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// column block begin
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width := b.cellwidth; // minimal width
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for ; this < line1; this++ {
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line_size, line_width = b.line(this);
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if column < line_size.Len() - 1 {
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line = b.line(this);
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if column < line.Len() - 1 {
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// cell exists in this column => update width
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w := line_width.At(column) + b.padding;
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w := line.At(column).(cell).width + b.padding;
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if w > width {
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width = w;
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}
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@ -316,73 +330,100 @@ func (b *Writer) format(pos0 int, line0, line1 int) (pos int, err os.Error) {
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}
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// Append text to current cell. Only update the cell width if updateWidth
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// is set (the cell width can only be updated if we know that we cannot be
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// in the middle of a UTF-8 encoded Unicode character).
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//
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func (b *Writer) append(text []byte, updateWidth bool) {
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b.buf.Write(text);
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b.cell.size += len(text);
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if updateWidth {
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b.cell.width += utf8.RuneCount(b.buf.Data()[b.pos : b.buf.Len()]);
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b.pos = b.buf.Len();
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}
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}
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// Start HTML-escape mode.
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func (b *Writer) startHTML(ch byte) {
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if ch == '<' {
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b.html_char = '>';
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} else {
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b.html_char = ';';
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}
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}
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// Terminate HTML-escape mode. If the HTML text was an entity, its width
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// is assumed to be one for formatting purposes; otherwise it assumed to
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// be zero.
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//
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func (b *Writer) terminateHTML() {
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if b.html_char == ';' {
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// was entity, count as one rune
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b.cell.width++;
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}
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b.pos = b.buf.Len();
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b.html_char = 0;
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}
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// Terminate the current cell by adding it to the list of cells of the
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// current line. Returns the number of cells in that line.
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//
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func (b *Writer) terminateCell() int {
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line := b.line(b.lines.Len() - 1);
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line.Push(b.cell);
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b.cell = cell{};
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return line.Len();
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}
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// Flush should be called after the last call to Write to ensure
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// that any data buffered in the Writer is written to output.
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// that any data buffered in the Writer is written to output. Any
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// incomplete HTML tag or entity at the end is simply considered
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// complete for formatting purposes.
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//
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func (b *Writer) Flush() os.Error {
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_, err := b.format(0, 0, b.lines_size.Len());
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// reset (even in the presence of errors)
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b.buf.Reset();
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b.size, b.width = 0, 0;
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b.pos = 0;
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b.lines_size.Init(0);
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b.lines_width.Init(0);
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b.addLine();
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// add current cell if not empty
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if b.cell.size > 0 {
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if b.html_char != 0 {
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// inside html tag/entity - terminate it even if incomplete
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b.terminateHTML();
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}
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b.terminateCell();
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}
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// format contents of buffer
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_, err := b.format(0, 0, b.lines.Len());
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// reset, even in the presence of errors
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b.reset();
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return err;
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}
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func unicodeLen(buf []byte) int {
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l := 0;
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for i := 0; i < len(buf); {
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if buf[i] < utf8.RuneSelf {
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i++;
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} else {
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rune, size := utf8.DecodeRune(buf[i : len(buf)]);
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i += size;
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}
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l++;
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}
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return l;
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}
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func (b *Writer) append(buf []byte) {
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b.buf.Write(buf);
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b.size += len(buf);
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}
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// Write writes buf to the writer b.
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// The only errors returned are ones encountered
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// while writing to the underlying output stream.
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//
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func (b *Writer) Write(buf []byte) (written int, err os.Error) {
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i0, n := 0, len(buf);
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// split text into cells
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for i := 0; i < n; i++ {
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ch := buf[i];
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i0 := 0;
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for i, ch := range buf {
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if b.html_char == 0 {
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// outside html tag/entity
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switch ch {
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case '\t', '\n', '\f':
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b.append(buf[i0 : i]);
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// end of cell
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b.append(buf[i0 : i], true);
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i0 = i+1; // exclude ch from (next) cell
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b.width += unicodeLen(b.buf.Data()[b.pos : b.buf.Len()]);
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b.pos = b.buf.Len();
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// terminate cell
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last_size, last_width := b.line(b.lines_size.Len() - 1);
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last_size.Push(b.size);
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last_width.Push(b.width);
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b.size, b.width = 0, 0;
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ncells := b.terminateCell();
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if ch != '\t' {
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// terminate line
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b.addLine();
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if ch == '\f' || last_size.Len() == 1 {
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if ch == '\f' || ncells == 1 {
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// A '\f' always forces a flush. Otherwise, if the previous
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// line has only one cell which does not have an impact on
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// the formatting of the following lines (the last cell per
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@ -395,37 +436,29 @@ func (b *Writer) Write(buf []byte) (written int, err os.Error) {
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}
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case '<', '&':
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// possibly an html tag/entity
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if b.flags & FilterHTML != 0 {
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b.append(buf[i0 : i]);
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// begin of tag/entity
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b.append(buf[i0 : i], true);
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i0 = i;
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b.width += unicodeLen(b.buf.Data()[b.pos : b.buf.Len()]);
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b.pos = -1; // preventative - should not be used (will cause index out of bounds)
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if ch == '<' {
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b.html_char = '>';
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} else {
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b.html_char = ';';
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}
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b.startHTML(ch);
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}
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}
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} else {
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// inside html tag/entity
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if ch == b.html_char {
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// reached the end of tag/entity
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b.append(buf[i0 : i + 1]);
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i0 = i + 1;
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if b.html_char == ';' {
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b.width++; // count as one char
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}
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b.pos = b.buf.Len();
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b.html_char = 0;
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// end of tag/entity
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b.append(buf[i0 : i+1], false);
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i0 = i+1; // exclude ch from (next) cell
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b.terminateHTML();
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}
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}
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}
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// append leftover text
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b.append(buf[i0 : n]);
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return n, nil;
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b.append(buf[i0 : len(buf)], false);
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return len(buf), nil;
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}
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@ -47,31 +47,31 @@ func (b *buffer) String() string {
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}
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func write(t *testing.T, w *tabwriter.Writer, src string) {
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func write(t *testing.T, testname string, w *tabwriter.Writer, src string) {
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written, err := io.WriteString(w, src);
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if err != nil {
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t.Errorf("--- src:\n%s\n--- write error: %v\n", src, err);
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t.Errorf("--- test: %s\n--- src:\n%s\n--- write error: %v\n", testname, src, err);
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}
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if written != len(src) {
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t.Errorf("--- src:\n%s\n--- written = %d, len(src) = %d\n", src, written, len(src));
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t.Errorf("--- test: %s\n--- src:\n%s\n--- written = %d, len(src) = %d\n", testname, src, written, len(src));
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}
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}
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func verify(t *testing.T, w *tabwriter.Writer, b *buffer, src, expected string) {
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func verify(t *testing.T, testname string, w *tabwriter.Writer, b *buffer, src, expected string) {
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err := w.Flush();
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if err != nil {
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t.Errorf("--- src:\n%s\n--- flush error: %v\n", src, err);
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t.Errorf("--- test: %s\n--- src:\n%s\n--- flush error: %v\n", testname, src, err);
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}
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res := b.String();
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if res != expected {
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t.Errorf("--- src:\n%s\n--- found:\n%s\n--- expected:\n%s\n", src, res, expected)
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t.Errorf("--- test: %s\n--- src:\n%s\n--- found:\n%s\n--- expected:\n%s\n", testname, src, res, expected)
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}
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}
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func check(t *testing.T, tabwidth, padding int, padchar byte, flags uint, src, expected string) {
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func check(t *testing.T, testname string, tabwidth, padding int, padchar byte, flags uint, src, expected string) {
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var b buffer;
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b.init(1000);
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@ -80,30 +80,31 @@ func check(t *testing.T, tabwidth, padding int, padchar byte, flags uint, src, e
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// write all at once
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b.clear();
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write(t, &w, src);
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verify(t, &w, &b, src, expected);
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write(t, testname, &w, src);
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verify(t, testname, &w, &b, src, expected);
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|
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// write byte-by-byte
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b.clear();
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for i := 0; i < len(src); i++ {
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write(t, &w, src[i : i+1]);
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write(t, testname, &w, src[i : i+1]);
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}
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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) 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<o\t<b>bar</b>\t\n",
|
||||
"f) f<o..<b>bar</b>.....\n"
|
||||
},
|
||||
|
||||
entry{
|
||||
"7g",
|
||||
8, 1, '.', tabwriter.FilterHTML,
|
||||
"g) f<o\t<b>bar</b>\t non-terminated entity &",
|
||||
"g) f<o..<b>bar</b>..... non-terminated entity &"
|
||||
},
|
||||
|
||||
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);
|
||||
}
|
||||
}
|
||||
|
||||
Loading…
Reference in New Issue
Block a user