parsePatch Function Summarysummary Objectfiles (object)additions (array)deletions (array)totalAdditions (number): The total number of added lines in the patch.totalDeletions (number): The total number of deleted lines in the patch.npm run import -- "parse patch file"const fs = require("fs");
function parsePatch(patchFile) {
let patchContent = patchFile
if(fs.existsSync(patchFile)) {
patchContent = fs.readFileSync(patchFile, "utf-8");
}
const lines = patchContent.split("\n");
let summary = {
files: {},
totalAdditions: 0,
totalDeletions: 0
};
let currentFile = null;
lines.forEach(line => {
console.log(line)
if (line.startsWith("+++ b/")) {
currentFile = line.replace("+++ b/", "").trim();
summary.files[currentFile] = { additions: [], deletions: [] };
} else if (line.startsWith("+") && !line.startsWith("+++")) {
const addedLine = line.slice(1).trim(); // Remove leading '+' and trim
summary.files[currentFile].additions.push(addedLine);
summary.totalAdditions++;
} else if (line.startsWith("-") && !line.startsWith("---")) {
const deletedLine = line.slice(1).trim(); // Remove leading '+' and trim
summary.files[currentFile].deletions.push(deletedLine);
summary.totalDeletions++;
} else if (line.startsWith('@')) {
} else if (line.startsWith('diff')) {
} else if (line.startsWith('index')) {
} else if (!line.startsWith("---")) {
const addedLine = line.slice(1).trim(); // Remove leading '+' and trim
summary.files[currentFile].additions.push(addedLine);
}
});
return summary;
}
module.exports = parsePatch
```javascript
const fs = require("fs");
const path = require("path");
/**
* Parsers a patch file and extracts information about added and deleted lines.
*
* @param {string} patchFile Path to the patch file to parse.
* @returns {object} An object containing summary information about the patch.
*/
function parsePatch(patchFile) {
// Check if the patch file exists, and read its contents if it does
const patchContent = fs.existsSync(patchFile)? fs.readFileSync(patchFile, "utf-8") : null;
// If the patch file does not exist, return null
if (!patchContent) {
return null;
}
// Split the patch content into individual lines
const lines = patchContent.split("\n");
// Initialize the summary object
const summary = {
files: {},
totalAdditions: 0,
totalDeletions: 0
};
// Initialize the current file being processed
let currentFile = null;
// Iterate over each line in the patch
lines.forEach(line => {
// Check if the line indicates the start of a new file
if (line.startsWith("+++ b/")) {
// Extract the filename from the line and add it to the summary
currentFile = line.replace("+++ b/", "").trim();
summary.files[currentFile] = { additions: [], deletions: [] };
}
// Check if the line indicates an added line
else if (line.startsWith("+") &&!line.startsWith("+++")) {
// Extract the added line and add it to the summary
summary.files[currentFile].additions.push(line.slice(1).trim());
summary.totalAdditions++;
}
// Check if the line indicates a deleted line
else if (line.startsWith("-") &&!line.startsWith("---")) {
// Extract the deleted line and add it to the summary
summary.files[currentFile].deletions.push(line.slice(1).trim());
summary.totalDeletions++;
}
// Check if the line indicates a header line (TODO: add logic to handle these lines)
else if (line.startsWith("@")) {
// TODO: Handle header lines
}
// Check if the line indicates the start of a diff (TODO: add logic to handle these lines)
else if (line.startsWith("diff")) {
// TODO: Handle diff lines
}
// Check if the line indicates the start of an index (TODO: add logic to handle these lines)
else if (line.startsWith("index")) {
// TODO: Handle index lines
}
// Check if the line is a normal line (TODO: add logic to handle these lines)
else if (!line.startsWith("---")) {
// Extract the line and add it to the summary
summary.files[currentFile].additions.push(line.slice(1).trim());
}
});
// Return the summary object
return summary;
}
module.exports = parsePatch;
```patchFile (string): Path to the patch file to parse.summary (object): An object containing information about the patch, including:
files (object): An object with file names as keys and objects containing addition and deletion information as values.totalAdditions (number): The total number of added lines in the patch.totalDeletions (number): The total number of deleted lines in the patch.The parsePatch function reads a patch file and parses its contents. It iterates over each line in the file, checking for specific patterns to determine what type of information it contains. Specifically, it looks for:
+++ b/: Indicates the start of a new file. It extracts the file name and initializes the addition and deletion arrays for that file.+, +++, and @: Ignore these lines as they are not applicable to the patch content.- and ---: Ignore these lines as they are not applicable to the patch content.diff, index, and patch: Ignore these lines as they are not applicable to the patch content.+++, ---, and other unknown lines: Extract the line content and add it to the additions array for the current file.After parsing all lines in the file, the function returns an object containing the summary information.
The function uses the fs module to interact with the filesystem:
fs.existsSync(patchFile): Checks if the patch file exists.fs.readFileSync(patchFile, "utf-8"): Reads the contents of the patch file.