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grader.js
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executable file
·60 lines (49 loc) · 1.56 KB
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#!/usr/bin/env node
/*
Automatically grade files for the presence of specified HTML tags/attributes.
Uses commander.js and cheerio. Teaches command line application development
and basic DOM parsing.
*/
var fs = require('fs');
var program = require('commander');
var cheerio = require('cheerio');
var HTMLFILE_DEFAULT = "index.html";
var CHECKSFILE_DEFAULT = "checks.json";
var assertFileExists = function(infile){
var instr = infile.toString();
if(!fs.existsSync(instr)) {
console.log("%s does not exist. Exiting.",instr);
process.exit(1);
}
return instr;
}
var cheerioHtmlFile = function(htmlfile){
return cheerio.load(fs.readFileSync(htmlfile));
}
var loadChecks = function(checksfile){
return JSON.parse(fs.readFileSync(checksfile));
}
var checkHtmlFile = function(htmlfile, checksfile){
$ = cheerioHtmlFile(htmlfile);
var checks = loadChecks(checksfile).sort();
var out = {};
for ( var ii in checks){
var present = $(checks[ii]).length > 0;
out[checks[ii]]= present;
}
return out;
}
var clone = function(fn) {
return fn.bind({});
}
if (require.main == module){
program
.option('-c, --checks <check_file>', 'Path to checks.json',clone(assertFileExists), CHECKSFILE_DEFAULT)
.option('-f, --file <html_file>', 'Path to index.html',clone(assertFileExists), HTMLFILE_DEFAULT)
var checkJson = checkHtmlFile(program.file, program.checks);
var outJson = JSON.stringify(checkJson, null,4);
console.log(outJson);
}
else{
exports.checkHtmlFile = checkHtmlFile;
}