You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: diff.go
    path of file: ./repos/cf-tool/vendor/github.com/sergi/go-diff/diffmatchpatch
    
    the code of the file until where you have to start completion: // Copyright (c) 2012-2016 The go-diff authors. All rights reserved.
// https://github.com/sergi/go-diff
// See the included LICENSE file for license details.
//
// go-diff is a Go implementation of Google's Diff, Match, and Patch library
// Original library is Copyright (c) 2006 Google Inc.
// http://code.google.com/p/google-diff-match-patch/

package diffmatchpatch

import (
	"bytes"
	"errors"
	"fmt"
	"html"
	"math"
	"net/url"
	"regexp"
	"strconv"
	"strings"
	"time"
	"unicode/utf8"
)

// Operation defines the operation of a diff item.
type Operation int8

const (
	// DiffDelete item represents a delete diff.
	DiffDelete Operation = -1
	// DiffInsert item represents an insert diff.
	DiffInsert Operation = 1
	// DiffEqual item represen
    
func (dmp *DiffMatchPatch) diffLineMode(text1, text2 []rune, deadline time.Time) []Diff {
	// Scan the text on a line-by-line basis first.
	text1, text2, linearray := dmp.diffLinesToRunes(text1, text2)

	diffs := dmp.diffMainRunes(text1, text2, false, deadline)

	// Convert the diff back to original text.
	diffs = dmp.DiffCharsToLines(diffs, linearray)
	// Eliminate freak matches (e.g. blank lines)
	diffs = dmp.DiffCleanupSemantic(diffs)

	// Rediff any replacement blocks, this time character-by-character.
	// Add a dummy entry at the end.
	diffs = append(diffs, Diff{DiffEqual, ""})

	pointer := 0
	countDelete := 0
	countInsert := 0

	// NOTE: Rune slices are slower than using strings in this case.
	textDelete := ""
	textInsert := ""

	for pointer < len(diffs) {
		switch diffs[pointer].Type {
		case DiffInsert:
			countInsert++
			textInsert += diffs[pointer].Text
		case DiffDelete:
			countDelete++
			textDelete += diffs[pointer].Text
		case DiffEqual:
			// Upon reaching an equality, check for prior redundancies.
			if countDelete >= 1 && countInsert >= 1 {
				// Delete the offending records and add the merged ones.
				diffs = splice(diffs, pointer-countDelete-countInsert,
					countDelete+countInsert)

				pointer = pointer - countDelete - countInsert
				a := dmp.diffMainRunes([]rune(textDelete), []rune(textInsert), false, deadline)
				for j := len(a) - 1; j >= 0; j-- {
					diffs = splice(diffs, pointer, 0, a[j])
				}
				pointer = pointer + len(a)
			}

			countInsert = 0
			countDelete = 0
			textDelete = ""
			textInsert = ""
		}
		pointer++
	}

	return diffs[:len(diffs)-1] // Remove the dummy entry at the end.
}