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jshint-mode.js
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jshint-mode.js
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/* HTTP interface to JSHint.
curl --form source="<path/to/my.js" --form=filename="my.js" --form mode=jshint --form showCode=1 http://127.0.0.1:3003/check
POST parameters:
source the contents of the file (the < is a curl construct which
inlines the contents of the file in the param).
filename is the name of that file
mode The linter to use. 'jshint' or 'jslint' (default jshint).
showCode Whether to include source code evidence with the
errors. '0' or '1' (default '0'). Not including error
content speeds up flymake parsing and operation.
CLI Usage:
jshint-mode.js --host HOST --port PORT --lastport LASTPORT
Start listening at address HOST. The first port between PORT
and LASTPORT is used for listening (default 3003-3003). The
chosen port is printed on stdout on the first line output.
Dynamic ports are needed when the server is started by emacs
flymake. Multiple emacs processes can use the same server
endpoint, but the server is shut down when one window is
closed. By allowing each flymake process to start its own
server on a different port, cleanup of one window does not
interfere with another's.
Example output indicating address and port:
'Started JSHint server at http://127.0.0.1:3003'
TODO:
parse incoming source files for embedded jshint options
support file uploads?
speed up
*/
var http = require('http'),
formidable = require('formidable'),
fs = require('fs'),
C = require('constants'),
JSLINT = require('./jslint'),
JSHINT = require('./jshint.2.9.2'),
JSHINT_OLD = require('./jshint.old');
if (!fs.existsSync) {
fs.existsSync = require('path').existsSync;
}
var hinters = {
jshint: JSHINT.JSHINT,
jslint: JSLINT.JSLINT,
jshint_old: JSHINT_OLD.JSHINT
};
function getOpt(key) {
var index = process.argv.indexOf(key);
return index !== -1 ? process.argv[index + 1] : false;
}
function outputErrors(errors, showCode) {
var e, i, output = [];
function out(s) {
output.push(s + '\n');
}
for (i = 0; i < errors.length; i += 1) {
e = errors[i];
if (e) {
out('Lint at line ' + e.line + ' character ' + e.character + ': ' + e.reason);
if (showCode) {
out((e.evidence || '').replace(/^\s*(\S*(\s+\S+)*)\s*$/, "$1"));
out('');
}
}
}
return output.join('');
}
function lintify(mode, sourcedata, filename, showCode, config) {
var passed = hinters[mode](sourcedata, config);
return passed ? "js: No problems found in " + filename + "\n"
: outputErrors(hinters[mode].errors, showCode);
}
// This is copied from jshint mode, that's how they load the config file
function _removeJsComments(str) {
str = str || '';
// replace everything between "/* */" in a non-greedy way
// The English version of the regex is:
// match '/*'
// then match 0 or more instances of any character (including newlines)
// except for instances of '*/'
// then match '*/'
str = str.replace(/\/\*(?:(?!\*\/)[\s\S])*\*\//g, '');
str = str.replace(/\/\/[^\n\r]*/g, ''); //everything after "//"
return str;
}
function _getConfig(filePath) {
// detect file changes without accessing content.
function _statChanged(s, other) {
if (!other) {
return true;
}
// Most changes detected:
// - overwrite file with a newer file (mv or cp)
// - overwrite file with an older file (mv or cp)
// - file size changed (regardless of mtime)
// - file edited in place and mtime updated
return (s.dev !== other.dev ||
s.ino !== other.ino ||
s.size !== other.size ||
s.mtime.getTime() !== other.mtime.getTime());
}
/**
Try reading the hinter configuration file (e.g. .jshintrc).
Return config object and its fs.Stats.
*/
function _refreshConfig(filePath) {
if (!filePath) {
return {cfg: {}, stat: null};
}
var prev = _cache[filePath] || {cfg: {}, stat: null};
var fd = -1;
try {
fd = fs.openSync(filePath, C.O_RDONLY);
var statbuf = fs.fstatSync(fd);
if (_statChanged(statbuf, prev.stat)) {
var rc = JSON.parse(_removeJsComments(fs.readFileSync(fd, "utf-8")));
console.log("Loading jshintrc: " + filePath);
return {cfg: rc, stat: statbuf};
}
prev.stat = statbuf;
return prev;
} catch (err) {
var stack = err.stack.replace(/^[^\(]+?[\n$]/gm, '')
.replace(/^\s+at\s+/gm, '')
.replace(/^Object.<anonymous>\s*\(/gm, '{anonymous}()@')
.split('\n');
console.log(stack);
console.error("Could not load jshintrc:" + err);
return prev;
} finally {
if (fd > -1) {
try { fs.closeSync(fd); }
catch (err) {}
}
}
}
_cache[filePath] = _refreshConfig(filePath);
return _cache[filePath].cfg;
}
var port = parseInt(getOpt("--port"), 10) || 3003,
lastPort = parseInt(getOpt("--lastport"),10) || 3003,
host = getOpt("--host") || "127.0.0.1",
_cache = {};
var server = http.createServer(function(req, res) {
if (req.url === '/check' && req.method.toUpperCase() === 'POST') {
var form = new formidable.IncomingForm();
form.parse(req, function(err, fields, files) {
var mode = (fields.mode && fields.mode == "jslint") ? "jslint" : "jshint";
var showCode = (fields.showCode && fields.showCode === "1") ? true : false;
var now = new Date().getTime();
console.log('Applying \'' + mode + '\' to: ' + (fields.filename || 'anonymous'));
var config = _getConfig(fields.jshintrc);
var results = lintify(mode, fields.source, fields.filename, showCode, config);
console.log('Took ' + (new Date().getTime() - now) + 'ms to lint ' + (fields.filename || 'anonymous'));
res.writeHead(200, {'Content-Type': 'text/plain'});
res.end(results);
});
return;
}
res.writeHead(200, {'Content-Type': 'text/plain'});
res.end("hello from jshint-mode");
});
server.on('listening', function () {
console.log('Started JSHint server at http://' + host + ':' + port + '.');
});
server.on('error', function (err) {
if (err.errno === "EADDRINUSE") {
if (port >= lastPort) {
console.error("Error occurred during '" + err.syscall + "':", err.code);
process.exit(2);
} else {
// find the next available port
port += 1;
server.listen(port, host);
}
}
});
server.listen(port, host);