TextDiff

MMO.git · 1 symbol · generated 27 Oct 2026

class

TextDiff

The diff of two texts, without git: lines with Myers' algorithm, cut into hunks shaped as DiffController's ({oldStart, oldCount, newStart, newCount, context, lines: [{type, old, new, text}]}), so that what is not in a repository (a page's two revisions...) is drawn like a commit. And the words that changed inside a line.

class MMO.git.TextDiff

Namespace: MMO.git

const hunks = MMO.git.TextDiff.hunks('a\nb\nc\n', 'a\nB\nc\n'); //[{oldStart: 1, oldCount: 3, newStart: 1, newCount: 3, context: '', lines: [{type: ' ', old: 1, new: 1, text: 'a'}, {type: '-', ...}, ...]}]

Index

	Lines(text) static
	Edits(a, b) static	The shortest edit script between two lists (Myers, O((N+M)D)).
	Middle(a, b, x0, x1, y0, y1) static	[internal] Myers' search between a[x0..x1) and b[y0..y1), walked back from its trace
	hunks(oldText, newText, context) static	The hunks of a diff, with $context unchanged lines around each change, a removal before the additions it is replaced by (as git writes them).
	Flush(hunk) static	[internal] move a hunk's pending removals then additions into its lines
	Before(lines, side) static	[internal] @return {number} the line before a hunk that has none on $side
	Words(text) static	The words of a line: runs of letters and digits, of spaces, and each other character alone.
	words(oldText, newText) static	The parts of two lines that differ, as character ranges -- what is darker in a modified line.

Methods8

Lines(text)

staticTextDiff.js:18

static Lines(text)

text	`?string`
returns	`Array<string>`	its lines, without their ends; a final end of line makes no extra empty line

Edits(a, b)

staticTextDiff.js:31

The shortest edit script between two lists (Myers, O((N+M)D)).

static Edits(a, b)

a	`Array<string>`
b	`Array<string>`
returns	`Array<Array>`	`[type, indexInA, indexInB]` in order: ' ' both, '-' a only, '+' b only (the absent index is null)

Middle(a, b, x0, x1, y0, y1)

staticTextDiff.js:48

[internal] Myers' search between a[x0..x1) and b[y0..y1), walked back from its trace

static Middle(a, b, x0, x1, y0, y1)

a
b
x0
x1
y0
y1

hunks(oldText, newText, context)

staticTextDiff.js:93

The hunks of a diff, with $context unchanged lines around each change, a removal before the additions it is replaced by (as git writes them).

static hunks(oldText, newText, context = 3)

oldText	`?string`
newText	`?string`
context = 3	`number`
returns	`Array<Object>`

Flush(hunk)

staticTextDiff.js:134

[internal] move a hunk's pending removals then additions into its lines

static Flush(hunk)

hunk

Before(lines, side)

staticTextDiff.js:141

[internal] @return {number} the line before a hunk that has none on $side

static Before(lines, side)

lines
side

Words(text)

staticTextDiff.js:152

The words of a line: runs of letters and digits, of spaces, and each other character alone.

static Words(text)

text	`string`
returns	`Array<string>`

words(oldText, newText)

staticTextDiff.js:163

The parts of two lines that differ, as character ranges -- what is darker in a modified line.

static words(oldText, newText)

oldText	`string`
newText	`string`
returns	`?{old: Array<Array<number>>, new: Array<Array<number>>`	} `[start, end)` ranges on each side; null when the lines have too little in common for it to mean anything