1 files changed, 0 insertions, 175 deletions
diff --git a/src/pkg/patch/textdiff.go b/src/pkg/patch/textdiff.go
deleted file mode 100644
index 482bd6781..000000000
--- a/src/pkg/patch/textdiff.go
+++ /dev/null
@@ -1,175 +0,0 @@
-package patch
-
-import (
-	"bytes"
-	"os"
-)
-
-type TextDiff []TextChunk
-
-// A TextChunk specifies an edit to a section of a file:
-// the text beginning at Line, which should be exactly Old,
-// is to be replaced with New.
-type TextChunk struct {
-	Line int
-	Old  []byte
-	New  []byte
-}
-
-func ParseTextDiff(raw []byte) (TextDiff, os.Error) {
-	var chunkHeader []byte
-
-	// Copy raw so it is safe to keep references to slices.
-	_, chunks := sections(raw, "@@ -")
-	delta := 0
-	diff := make(TextDiff, len(chunks))
-	for i, raw := range chunks {
-		c := &diff[i]
-
-		// Parse start line: @@ -oldLine,oldCount +newLine,newCount @@ junk
-		chunk := splitLines(raw)
-		chunkHeader = chunk[0]
-		var ok bool
-		var oldLine, oldCount, newLine, newCount int
-		s := chunkHeader
-		if oldLine, s, ok = atoi(s, "@@ -", 10); !ok {
-			goto ErrChunkHdr
-		}
-		if len(s) == 0 || s[0] != ',' {
-			oldCount = 1
-		} else if oldCount, s, ok = atoi(s, ",", 10); !ok {
-			goto ErrChunkHdr
-		}
-		if newLine, s, ok = atoi(s, " +", 10); !ok {
-			goto ErrChunkHdr
-		}
-		if len(s) == 0 || s[0] != ',' {
-			newCount = 1
-		} else if newCount, s, ok = atoi(s, ",", 10); !ok {
-			goto ErrChunkHdr
-		}
-		if !hasPrefix(s, " @@") {
-			goto ErrChunkHdr
-		}
-
-		// Special case: for created or deleted files, the empty half
-		// is given as starting at line 0.  Translate to line 1.
-		if oldCount == 0 && oldLine == 0 {
-			oldLine = 1
-		}
-		if newCount == 0 && newLine == 0 {
-			newLine = 1
-		}
-
-		// Count lines in text
-		var dropOldNL, dropNewNL bool
-		var nold, nnew int
-		var lastch byte
-		chunk = chunk[1:]
-		for _, l := range chunk {
-			if nold == oldCount && nnew == newCount && (len(l) == 0 || l[0] != '\\') {
-				if len(bytes.TrimSpace(l)) != 0 {
-					return nil, SyntaxError("too many chunk lines")
-				}
-				continue
-			}
-			if len(l) == 0 {
-				return nil, SyntaxError("empty chunk line")
-			}
-			switch l[0] {
-			case '+':
-				nnew++
-			case '-':
-				nold++
-			case ' ':
-				nnew++
-				nold++
-			case '\\':
-				if _, ok := skip(l, "\\ No newline at end of file"); ok {
-					switch lastch {
-					case '-':
-						dropOldNL = true
-					case '+':
-						dropNewNL = true
-					case ' ':
-						dropOldNL = true
-						dropNewNL = true
-					default:
-						return nil, SyntaxError("message `\\ No newline at end of file' out of context")
-					}
-					break
-				}
-				fallthrough
-			default:
-				return nil, SyntaxError("unexpected chunk line: " + string(l))
-			}
-			lastch = l[0]
-		}
-
-		// Does it match the header?
-		if nold != oldCount || nnew != newCount {
-			return nil, SyntaxError("chunk header does not match line count: " + string(chunkHeader))
-		}
-		if oldLine+delta != newLine {
-			return nil, SyntaxError("chunk delta is out of sync with previous chunks")
-		}
-		delta += nnew - nold
-		c.Line = oldLine
-
-		var old, new bytes.Buffer
-		nold = 0
-		nnew = 0
-		for _, l := range chunk {
-			if nold == oldCount && nnew == newCount {
-				break
-			}
-			ch, l := l[0], l[1:]
-			if ch == '\\' {
-				continue
-			}
-			if ch != '+' {
-				old.Write(l)
-				nold++
-			}
-			if ch != '-' {
-				new.Write(l)
-				nnew++
-			}
-		}
-		c.Old = old.Bytes()
-		c.New = new.Bytes()
-		if dropOldNL {
-			c.Old = c.Old[0 : len(c.Old)-1]
-		}
-		if dropNewNL {
-			c.New = c.New[0 : len(c.New)-1]
-		}
-	}
-	return diff, nil
-
-ErrChunkHdr:
-	return nil, SyntaxError("unexpected chunk header line: " + string(chunkHeader))
-}
-
-var ErrPatchFailure = os.NewError("patch did not apply cleanly")
-
-// Apply applies the changes listed in the diff
-// to the data, returning the new version.
-func (d TextDiff) Apply(data []byte) ([]byte, os.Error) {
-	var buf bytes.Buffer
-	line := 1
-	for _, c := range d {
-		var ok bool
-		var prefix []byte
-		prefix, data, ok = getLine(data, c.Line-line)
-		if !ok || !bytes.HasPrefix(data, c.Old) {
-			return nil, ErrPatchFailure
-		}
-		buf.Write(prefix)
-		data = data[len(c.Old):]
-		buf.Write(c.New)
-		line = c.Line + bytes.Count(c.Old, newline)
-	}
-	buf.Write(data)
-	return buf.Bytes(), nil
-}