diffmatchpatch

package
Version: v1.0.0 Latest Latest
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Published: Nov 10, 2017 License: MIT Imports: 11 Imported by: 1

Documentation

Overview

Package diffmatchpatch offers robust algorithms to perform the operations required for synchronizing plain text.

Index

Constants

This section is empty.

Variables

This section is empty.

Functions

This section is empty.

Types

type Diff

type Diff struct {
	Type Operation
	Text string
}

Diff represents one diff operation

type DiffMatchPatch

type DiffMatchPatch struct {
	// Number of seconds to map a diff before giving up (0 for infinity).
	DiffTimeout time.Duration
	// Cost of an empty edit operation in terms of edit characters.
	DiffEditCost int
	// How far to search for a match (0 = exact location, 1000+ = broad match). A match this many characters away from the expected location will add 1.0 to the score (0.0 is a perfect match).
	MatchDistance int
	// When deleting a large block of text (over ~64 characters), how close do the contents have to be to match the expected contents. (0.0 = perfection, 1.0 = very loose).  Note that MatchThreshold controls how closely the end points of a delete need to match.
	PatchDeleteThreshold float64
	// Chunk size for context length.
	PatchMargin int
	// The number of bits in an int.
	MatchMaxBits int
	// At what point is no match declared (0.0 = perfection, 1.0 = very loose).
	MatchThreshold float64
}

DiffMatchPatch holds the configuration for diff-match-patch operations.

func New

func New() *DiffMatchPatch

New creates a new DiffMatchPatch object with default parameters.

func (*DiffMatchPatch) DiffBisect

func (dmp *DiffMatchPatch) DiffBisect(text1, text2 string, deadline time.Time) []Diff

DiffBisect finds the 'middle snake' of a diff, split the problem in two and return the recursively constructed diff. If an invalid UTF-8 sequence is encountered, it will be replaced by the Unicode replacement character. See Myers 1986 paper: An O(ND) Difference Algorithm and Its Variations.

func (*DiffMatchPatch) DiffCharsToLines

func (dmp *DiffMatchPatch) DiffCharsToLines(diffs []Diff, lineArray []string) []Diff

DiffCharsToLines rehydrates the text in a diff from a string of line hashes to real lines of text.

func (*DiffMatchPatch) DiffCleanupEfficiency

func (dmp *DiffMatchPatch) DiffCleanupEfficiency(diffs []Diff) []Diff

DiffCleanupEfficiency reduces the number of edits by eliminating operationally trivial equalities.

func (*DiffMatchPatch) DiffCleanupMerge

func (dmp *DiffMatchPatch) DiffCleanupMerge(diffs []Diff) []Diff

DiffCleanupMerge reorders and merges like edit sections. Merge equalities. Any edit section can move as long as it doesn't cross an equality.

func (*DiffMatchPatch) DiffCleanupSemantic

func (dmp *DiffMatchPatch) DiffCleanupSemantic(diffs []Diff) []Diff

DiffCleanupSemantic reduces the number of edits by eliminating semantically trivial equalities.

func (*DiffMatchPatch) DiffCleanupSemanticLossless

func (dmp *DiffMatchPatch) DiffCleanupSemanticLossless(diffs []Diff) []Diff

DiffCleanupSemanticLossless looks for single edits surrounded on both sides by equalities which can be shifted sideways to align the edit to a word boundary. E.g: The c<ins>at c</ins>ame. -> The <ins>cat </ins>came.

func (*DiffMatchPatch) DiffCommonOverlap

func (dmp *DiffMatchPatch) DiffCommonOverlap(text1 string, text2 string) int

DiffCommonOverlap determines if the suffix of one string is the prefix of another.

func (*DiffMatchPatch) DiffCommonPrefix

func (dmp *DiffMatchPatch) DiffCommonPrefix(text1, text2 string) int

DiffCommonPrefix determines the common prefix length of two strings.

func (*DiffMatchPatch) DiffCommonSuffix

func (dmp *DiffMatchPatch) DiffCommonSuffix(text1, text2 string) int

DiffCommonSuffix determines the common suffix length of two strings.

func (*DiffMatchPatch) DiffFromDelta

func (dmp *DiffMatchPatch) DiffFromDelta(text1 string, delta string) (diffs []Diff, err error)

DiffFromDelta given the original text1, and an encoded string which describes the operations required to transform text1 into text2, comAdde the full diff.

func (*DiffMatchPatch) DiffHalfMatch

func (dmp *DiffMatchPatch) DiffHalfMatch(text1, text2 string) []string

DiffHalfMatch checks whether the two texts share a substring which is at least half the length of the longer text. This speedup can produce non-minimal diffs.

func (*DiffMatchPatch) DiffLevenshtein

func (dmp *DiffMatchPatch) DiffLevenshtein(diffs []Diff) int

DiffLevenshtein computes the Levenshtein distance that is the number of inserted, deleted or substituted characters.

func (*DiffMatchPatch) DiffLinesToChars

func (dmp *DiffMatchPatch) DiffLinesToChars(text1, text2 string) (string, string, []string)

DiffLinesToChars splits two texts into a list of strings, and educes the texts to a string of hashes where each Unicode character represents one line. It's slightly faster to call DiffLinesToRunes first, followed by DiffMainRunes.

func (*DiffMatchPatch) DiffLinesToRunes

func (dmp *DiffMatchPatch) DiffLinesToRunes(text1, text2 string) ([]rune, []rune, []string)

DiffLinesToRunes splits two texts into a list of runes. Each rune represents one line.

func (*DiffMatchPatch) DiffMain

func (dmp *DiffMatchPatch) DiffMain(text1, text2 string, checklines bool) []Diff

DiffMain finds the differences between two texts. If an invalid UTF-8 sequence is encountered, it will be replaced by the Unicode replacement character.

func (*DiffMatchPatch) DiffMainRunes

func (dmp *DiffMatchPatch) DiffMainRunes(text1, text2 []rune, checklines bool) []Diff

DiffMainRunes finds the differences between two rune sequences. If an invalid UTF-8 sequence is encountered, it will be replaced by the Unicode replacement character.

func (*DiffMatchPatch) DiffPrettyHtml

func (dmp *DiffMatchPatch) DiffPrettyHtml(diffs []Diff) string

DiffPrettyHtml converts a []Diff into a pretty HTML report. It is intended as an example from which to write one's own display functions.

func (*DiffMatchPatch) DiffPrettyText

func (dmp *DiffMatchPatch) DiffPrettyText(diffs []Diff) string

DiffPrettyText converts a []Diff into a colored text report.

func (*DiffMatchPatch) DiffText1

func (dmp *DiffMatchPatch) DiffText1(diffs []Diff) string

DiffText1 computes and returns the source text (all equalities and deletions).

func (*DiffMatchPatch) DiffText2

func (dmp *DiffMatchPatch) DiffText2(diffs []Diff) string

DiffText2 computes and returns the destination text (all equalities and insertions).

func (*DiffMatchPatch) DiffToDelta

func (dmp *DiffMatchPatch) DiffToDelta(diffs []Diff) string

DiffToDelta crushes the diff into an encoded string which describes the operations required to transform text1 into text2. E.g. =3\t-2\t+ing -> Keep 3 chars, delete 2 chars, insert 'ing'. Operations are tab-separated. Inserted text is escaped using %xx notation.

func (*DiffMatchPatch) DiffXIndex

func (dmp *DiffMatchPatch) DiffXIndex(diffs []Diff, loc int) int

DiffXIndex returns the equivalent location in s2.

func (*DiffMatchPatch) MatchAlphabet

func (dmp *DiffMatchPatch) MatchAlphabet(pattern string) map[byte]int

MatchAlphabet initialises the alphabet for the Bitap algorithm.

func (*DiffMatchPatch) MatchBitap

func (dmp *DiffMatchPatch) MatchBitap(text, pattern string, loc int) int

MatchBitap locates the best instance of 'pattern' in 'text' near 'loc' using the Bitap algorithm. Returns -1 if no match was found.

func (*DiffMatchPatch) MatchMain

func (dmp *DiffMatchPatch) MatchMain(text, pattern string, loc int) int

MatchMain locates the best instance of 'pattern' in 'text' near 'loc'. Returns -1 if no match found.

func (*DiffMatchPatch) PatchAddContext

func (dmp *DiffMatchPatch) PatchAddContext(patch Patch, text string) Patch

PatchAddContext increases the context until it is unique, but doesn't let the pattern expand beyond MatchMaxBits.

func (*DiffMatchPatch) PatchAddPadding

func (dmp *DiffMatchPatch) PatchAddPadding(patches []Patch) string

PatchAddPadding adds some padding on text start and end so that edges can match something. Intended to be called only from within patchApply.

func (*DiffMatchPatch) PatchApply

func (dmp *DiffMatchPatch) PatchApply(patches []Patch, text string) (string, []bool)

PatchApply merges a set of patches onto the text. Returns a patched text, as well as an array of true/false values indicating which patches were applied.

func (*DiffMatchPatch) PatchDeepCopy

func (dmp *DiffMatchPatch) PatchDeepCopy(patches []Patch) []Patch

PatchDeepCopy returns an array that is identical to a given an array of patches.

func (*DiffMatchPatch) PatchFromText

func (dmp *DiffMatchPatch) PatchFromText(textline string) ([]Patch, error)

PatchFromText parses a textual representation of patches and returns a List of Patch objects.

func (*DiffMatchPatch) PatchMake

func (dmp *DiffMatchPatch) PatchMake(opt ...interface{}) []Patch

PatchMake computes a list of patches.

func (*DiffMatchPatch) PatchSplitMax

func (dmp *DiffMatchPatch) PatchSplitMax(patches []Patch) []Patch

PatchSplitMax looks through the patches and breaks up any which are longer than the maximum limit of the match algorithm. Intended to be called only from within patchApply.

func (*DiffMatchPatch) PatchToText

func (dmp *DiffMatchPatch) PatchToText(patches []Patch) string

PatchToText takes a list of patches and returns a textual representation.

type Operation

type Operation int8

Operation defines the operation of a diff item.

const (
	// DiffDelete item represents a delete diff.
	DiffDelete Operation = -1
	// DiffInsert item represents an insert diff.
	DiffInsert Operation = 1
	// DiffEqual item represents an equal diff.
	DiffEqual Operation = 0
)

type Patch

type Patch struct {
	Start1  int
	Start2  int
	Length1 int
	Length2 int
	// contains filtered or unexported fields
}

Patch represents one patch operation.

func (*Patch) String

func (p *Patch) String() string

String emulates GNU diff's format. Header: @@ -382,8 +481,9 @@ Indices are printed as 1-based, not 0-based.

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