react-diff-view/esm/utils/parse.js

A git diff component to consume the git unified diff output.

import parser from 'gitdiff-parser';
export function isInsert(change) {
    return change.type === 'insert';
}
export function isDelete(change) {
    return change.type === 'delete';
}
export function isNormal(change) {
    return change.type === 'normal';
}
function zipChanges(changes) {
    const [result] = changes.reduce(([result, last, lastDeletionIndex], current, i) => {
        if (!last) {
            result.push(current);
            return [result, current, isDelete(current) ? i : -1];
        }
        if (isInsert(current) && lastDeletionIndex >= 0) {
            result.splice(lastDeletionIndex + 1, 0, current);
            // The new `lastDeletionIndex` may be out of range, but `splice` will fix it
            return [result, current, lastDeletionIndex + 2];
        }
        result.push(current);
        // Keep the `lastDeletionIndex` if there are lines of deletions,
        // otherwise update it to the new deletion line
        const newLastDeletionIndex = isDelete(current) ? (isDelete(last) ? lastDeletionIndex : i) : i;
        return [result, current, newLastDeletionIndex];
    }, [[], null, -1]);
    return result;
}
function mapHunk(hunk, options) {
    const changes = options.nearbySequences === 'zip' ? zipChanges(hunk.changes) : hunk.changes;
    return {
        ...hunk,
        isPlain: false,
        changes: changes,
    };
}
function mapFile(file, options) {
    const hunks = file.hunks.map(hunk => mapHunk(hunk, options));
    return { ...file, hunks };
}
function normalizeDiffText(text) {
    // Git diff header:
    //
    // diff --git a/test/fixture/test/ci.go b/test/fixture/test/ci.go
    // index 6829b8a2..4c565f1b 100644
    // --- a/test/fixture/test/ci.go
    // +++ b/test/fixture/test/ci.go
    if (text.startsWith('diff --git')) {
        return text;
    }
    // Unidiff header:
    //
    // --- /test/fixture/test/ci.go 2002-02-21 23:30:39.942229878 -0800
    // +++ /test/fixture/test/ci.go 2002-02-21 23:30:50.442260588 -0800
    const indexOfFirstLineBreak = text.indexOf('\n');
    const indexOfSecondLineBreak = text.indexOf('\n', indexOfFirstLineBreak + 1);
    const firstLine = text.slice(0, indexOfFirstLineBreak);
    const secondLine = text.slice(indexOfFirstLineBreak + 1, indexOfSecondLineBreak);
    const oldPath = firstLine.split(' ').slice(1, -3).join(' ');
    const newPath = secondLine.split(' ').slice(1, -3).join(' ');
    const segments = [
        `diff --git a/${oldPath} b/${newPath}`,
        'index 1111111..2222222 100644',
        `--- a/${oldPath}`,
        `+++ b/${newPath}`,
        text.slice(indexOfSecondLineBreak + 1),
    ];
    return segments.join('\n');
}
export function parseDiff(text, options = {}) {
    const diffText = normalizeDiffText(text.trimStart());
    const files = parser.parse(diffText);
    return files.map(file => mapFile(file, options));
}
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