/*
*
* Diff to HTML (diff2html.js)
* Author: rtfpessoa
* Date: Friday 29 August 2014
* Last Update: Sunday 25 January 2015
*
* Diff command:
* git diff
*/
(function (window) {
var ClassVariable;
ClassVariable = (function () {
var LINE_TYPE = {
INSERTS: "d2h-ins",
DELETES: "d2h-del",
CONTEXT: "d2h-cntx",
INFO: "d2h-info"
};
function Diff2Html() {
}
/*
* Generates pretty html from string diff input
*/
Diff2Html.prototype.getPrettyHtmlFromDiff = function (diffInput) {
var diffJson = generateDiffJson(diffInput);
return generateJsonHtml(diffJson);
};
/*
* Generates json object from string diff input
*/
Diff2Html.prototype.getJsonFromDiff = function (diffInput) {
return generateDiffJson(diffInput);
};
/*
* Generates pretty html from a json object
*/
Diff2Html.prototype.getPrettyHtmlFromJson = function (diffJson) {
return generateJsonHtml(diffJson);
};
/*
* Generates pretty side by side html from string diff input
*/
Diff2Html.prototype.getPrettySideBySideHtmlFromDiff = function (diffInput) {
var diffJson = generateDiffJson(diffInput);
return generateSideBySideJsonHtml(diffJson);
};
/*
* Generates pretty side by side html from a json object
*/
Diff2Html.prototype.getPrettySideBySideHtmlFromJson = function (diffJson) {
return generateSideBySideJsonHtml(diffJson);
};
var generateDiffJson = function (diffInput) {
var files = [],
currentFile = null,
currentBlock = null,
oldLine = null,
newLine = null;
var saveBlock = function () {
/* add previous block(if exists) before start a new file */
if (currentBlock) {
currentFile.blocks.push(currentBlock);
currentBlock = null;
}
};
var saveFile = function () {
/*
* add previous file(if exists) before start a new one
* if it has name (to avoid binary files errors)
*/
if (currentFile && currentFile.newName) {
files.push(currentFile);
currentFile = null;
}
};
var startFile = function () {
saveBlock();
saveFile();
/* create file structure */
currentFile = {};
currentFile.blocks = [];
currentFile.deletedLines = 0;
currentFile.addedLines = 0;
};
var startBlock = function (line) {
saveBlock();
var values = /^@@ -(\d+),\d+ \+(\d+),\d+ @@.*/.exec(line) ||
/^@@@ -(\d+),\d+ -\d+,\d+ \+(\d+),\d+ @@@.*/.exec(line) ||
[0, 0, 0];
oldLine = values[1];
newLine = values[2];
/* create block metadata */
currentBlock = {};
currentBlock.lines = [];
currentBlock.oldStartLine = oldLine;
currentBlock.newStartLine = newLine;
currentBlock.header = line;
};
var createLine = function (line) {
var currentLine = {};
currentLine.content = line;
/* fill the line data */
if (startsWith(line, "+") || startsWith(line, " +")) {
currentFile.addedLines++;
currentLine.type = LINE_TYPE.INSERTS;
currentLine.oldNumber = null;
currentLine.newNumber = newLine++;
currentBlock.lines.push(currentLine);
} else if (startsWith(line, "-") || startsWith(line, " -")) {
currentFile.deletedLines++;
currentLine.type = LINE_TYPE.DELETES;
currentLine.oldNumber = oldLine++;
currentLine.newNumber = null;
currentBlock.lines.push(currentLine);
} else {
currentLine.type = LINE_TYPE.CONTEXT;
currentLine.oldNumber = oldLine++;
currentLine.newNumber = newLine++;
currentBlock.lines.push(currentLine);
}
};
var diffLines = diffInput.split("\n");
diffLines.forEach(function (line) {
// Unmerged paths, and possibly other non-diffable files
// https://github.com/scottgonzalez/pretty-diff/issues/11
// Also, remove some useless lines
if (!line || startsWith(line, "*") ||
startsWith(line, "new") || startsWith(line, "index")) {
return;
}
var values = [];
if (startsWith(line, "diff")) {
startFile();
} else if (currentFile && !currentFile.oldName && (values = /^--- a\/(\S+).*$/.exec(line))) {
currentFile.oldName = values[1];
} else if (currentFile && !currentFile.newName && (values = /^\+\+\+ b\/(\S+).*$/.exec(line))) {
currentFile.newName = values[1];
} else if (currentFile && startsWith(line, "@@")) {
startBlock(line);
} else if (currentBlock) {
createLine(line);
}
});
saveBlock();
saveFile();
return files;
};
/*
* Line By Line HTML
*/
var generateJsonHtml = function (diffFiles) {
return "\n" +
diffFiles.map(function (file) {
return "
\n" +
" \n" +
"
\n" +
"
\n" +
"
\n" +
" \n" +
" " + generateFileHtml(file) +
" \n" +
"
\n" +
"
\n" +
"
\n" +
"
\n";
}).join("\n") +
"
\n" +
" | \n" +
" " +
" " + escape(block.header) + " " +
" | \n" +
"
\n";
for (var i = 0; i < block.lines.length; i++) {
var prevLine = block.lines[i - 1];
var line = block.lines[i];
var newLine = block.lines[i + 1];
var nextNewLine = block.lines[i + 2];
var isOppositeTypeTwoLineBlock =
line.type == LINE_TYPE.DELETES &&
newLine && newLine.type == LINE_TYPE.INSERTS &&
(!nextNewLine || nextNewLine && nextNewLine.type != LINE_TYPE.INSERTS) &&
(!prevLine || prevLine && prevLine.type != LINE_TYPE.DELETES);
var escapedLine = escape(line.content);
if (isOppositeTypeTwoLineBlock) {
var nextEscapedLine = escape(newLine.content);
var diff = diffHighlight(escapedLine, nextEscapedLine);
lines += generateLineHtml(line.type, line.oldNumber, line.newNumber, diff.o) +
generateLineHtml(newLine.type, newLine.oldNumber, newLine.newNumber, diff.n);
i++;
} else {
lines += generateLineHtml(line.type, line.oldNumber, line.newNumber, escapedLine);
}
}
return lines;
}).join("\n");
};
var generateLineHtml = function (type, oldNumber, newNumber, content) {
return "\n" +
" | " +
" " + valueOrEmpty(oldNumber) + " " +
" " + valueOrEmpty(newNumber) + " " +
" | \n" +
" " +
" " + content + " " +
" | \n" +
"
\n";
};
/*
* Side By Side HTML (work in progress)
*/
var generateSideBySideJsonHtml = function (diffFiles) {
return "\n" +
diffFiles.map(function (file) {
var diffs = generateSideBySideFileHtml(file);
return "
\n" +
" \n" +
"
\n" +
"
\n" +
"
\n" +
"
\n" +
" \n" +
" " + diffs.left +
" \n" +
"
\n" +
"
\n" +
"
\n" +
"
\n" +
"
\n" +
"
\n" +
" \n" +
" " + diffs.right +
" \n" +
"
\n" +
"
\n" +
"
\n" +
"
\n" +
"
\n";
}).join("\n") +
"
\n" +
" | \n" +
" " +
" " + escape(block.header) + " " +
" | \n" +
"
\n";
fileHtml.right += "\n" +
" | \n" +
" " +
" " +
" | \n" +
"
\n";
for (var i = 0; i < block.lines.length; i++) {
var prevLine = block.lines[i - 1];
var line = block.lines[i];
var newLine = block.lines[i + 1];
var nextNewLine = block.lines[i + 2];
var isOpositeTypeTwoLineBlock = line.type == LINE_TYPE.DELETES && newLine && newLine.type == LINE_TYPE.INSERTS &&
(!nextNewLine || nextNewLine && nextNewLine.type != LINE_TYPE.INSERTS) &&
(!prevLine || prevLine && prevLine.type != LINE_TYPE.DELETES);
var escapedLine = escape(line.content);
if (isOpositeTypeTwoLineBlock) {
var nextEscapedLine = escape(newLine.content);
var diff = diffHighlight(escapedLine, nextEscapedLine);
fileHtml.left += generateSingleLineHtml(line.type, line.oldNumber, diff.o);
fileHtml.right += generateSingleLineHtml(newLine.type, newLine.newNumber, diff.n);
i++;
} else if (line.type == LINE_TYPE.DELETES) {
fileHtml.left += generateSingleLineHtml(line.type, line.oldNumber, escapedLine);
fileHtml.right += generateSingleLineHtml(LINE_TYPE.CONTEXT, "", "", "");
} else if (line.type == LINE_TYPE.INSERTS) {
fileHtml.left += generateSingleLineHtml(LINE_TYPE.CONTEXT, "", "", "");
fileHtml.right += generateSingleLineHtml(line.type, line.newNumber, escapedLine);
} else {
fileHtml.left += generateSingleLineHtml(line.type, line.oldNumber, escapedLine);
fileHtml.right += generateSingleLineHtml(line.type, line.newNumber, escapedLine);
}
}
});
return fileHtml;
};
var generateSingleLineHtml = function (type, number, content) {
return "\n" +
" | " + number + " | \n" +
" " +
" " + content + " " +
" | \n" +
"
\n";
};
/*
* HTML Helpers
*/
var getDiffName = function (oldFilename, newFilename) {
if (oldFilename && newFilename && oldFilename !== newFilename) {
return oldFilename + " -> " + newFilename;
} else if (newFilename) {
return newFilename;
} else if (oldFilename) {
return oldFilename;
} else {
return "Unknown filename";
}
};
var removeIns = function (line) {
return line.replace(/(((.|\n)*?)<\/ins>)/g, "");
};
var removeDel = function (line) {
return line.replace(/(((.|\n)*?)<\/del>)/g, "");
};
/*
* Utils
*/
function escape(str) {
return str.slice(0)
.replace(/&/g, "&")
.replace(//g, ">")
.replace(/\t/g, " ");
}
function startsWith(str, start) {
return str.indexOf(start) === 0;
}
function valueOrEmpty(value) {
return value ? value : "";
}
function diffHighlight(diffLine1, diffLine2) {
/* remove the initial -/+ to avoid always having diff in the first char */
var highlightedLine = diffString(diffLine1.substr(1), diffLine2.substr(1));
return {
o: diffLine1.charAt(0) + removeIns(highlightedLine),
n: diffLine2.charAt(0) + removeDel(highlightedLine)
}
}
/* singleton pattern */
var instance;
return {
getInstance: function () {
if (instance === undefined) {
instance = new Diff2Html();
/* Hide the constructor so the returned objected can't be new'd */
instance.constructor = null;
}
return instance;
}
};
})();
window.Diff2Html = ClassVariable.getInstance();
return window.Diff2Html;
})(window);