IMDb Movie Parser started at http://userscripts.org/topics/132241

script.user.js

// ==UserScript==
// @name        IMDb Movie Parser
// @namespace   http://userscripts.org/topics/132241
// @description Creates a textarea at the bottom of the page with formatted text.
// @include     http://www.imdb.com/title/*
// @version     1.0.3
// @grant       none
// ==/UserScript==

(function () {
	'use strict';

	if (window.frameElement) {
		return;
	}

	var param,
		movieData = {},
		movieParams = {
			IMDbLink: function () {
				return location.href;
			},
			Title: function () {
				var e = $qs('h1 span[itemprop="name"], #tn15title h1');
				if (!e) {return;}
				if ($qs('a[href*="year"]'), e) {
					e = e.firstChild;
				}
				return trimFix(e.textContent);
			},
			Year: function () {
				var e = $qs('h1 span[itemprop="name"] + span a, #tn15title a[href*="/year/"]');
				if (!e) {return;}
				return trimFix(e.textContent);
			},
			Description: function () {
				var e = $qs('#overview-top [itemprop="description"]');
				if (!e) {return;}
				return trimFix(e.textContent);
			},
			Storyline: function () {
				var e = $qs('#titleStoryLine [itemprop="description"] p');
				if (!e) {return;}
				return trimFix(e.textContent);
			},
			Poster: function () {
				var e = $qs('#img_primary img, #primary-poster');
				if (!e) {return;}
				return e.src;
			},
			Cast: function () {
				var e = $qsa('.cast_list tr:not(:first-child), .cast tr'),
					cast = [];
				if (!e) {return;}
				e.forEach(function (e) {
					var person = {
						name: trimFix($qs('[itemprop="actor"] a span, .nm', e).textContent),
						photo: $qs('.primary_photo img, .hs img', e).src,
						link: $qs('[itemprop="actor"] a, .nm a', e).href,
						character: trimFix($qs('.character, .char', e).textContent)
					};
					cast.push(person);
				});
				return cast;
			},
			details: function () {
				var e = $qsa('#overview-top h4, #titleDetails h4, #titleStoryLine h4, #tn15content h5'),
					details = {};
				if (!e) {return;}
				e.forEach(function (e) {
					var detail = [],
						name = trimFix(e.textContent.replace(':', ''));
					e = e.nextSibling;
					while (e) {
						if (e.classList && e.classList.contains('info-content')) {
							e = e.firstChild;
							continue;
						}
						if (e.classList && (e.classList.contains('see-more') || e.classList.contains('ghost') || e.classList.contains('tn15more'))) {
							e = e.nextSibling;
							continue;
						}
						var eText = trimFix(e.textContent.replace('»', ''));
						if (name === "Plot") {
							console.log({
								e: e,
								eText: eText
							});
						}
						if (
							eText === '' ||
							eText === ',' ||
							eText === '|'
						) {
							e = e.nextSibling;
							continue;
						}

						if (e.href) {
							detail.push({
								text: eText,
								link: e.href
							});
						}
						else {
							detail.push(eText);
						}
						e = e.nextSibling;
					}
					details[name] = detail;
				});
				return details;
			}
		};

	// Run callbacks on each param and replace it on the main object.
	for (param in movieParams) {
		if (movieParams.hasOwnProperty(param)) {
			movieData[param] = movieParams[param]();
		}
	}
	
	// Merge generic details container and delete it.
	movieData = merge(movieData, movieData.details);
	delete movieData.details;

	console.log(movieData);

	// The format displayed in the text box.
	var format = [
		'[size=6]%Title%[/size]',
		'[img]%Poster%[/img]',
		'%IMDbLink%',
		'',
		'[b]Year:[/b] %Year%',
		'[b]Runtime:[/b] %Runtime%',
		'[b]Genre(s):[/b] %Genres%',
		'[b]Language(s):[/b] %Language%',
		'[b]Country:[/b] %Country%',
		'[b]Plot:[/b] [size=3]%Description%[/size]',
		'',
		'[b]Director(s):[/b]',
		'%Director%',
		'',
		'[b]Writer(s):[/b]',
		'%Writers%',
		'',
		'[b]Cast:[/b]',
		'%Cast%',
		'',
	].join('\n');
	// How certain tokens should be separated.
	var separators = {
		'Cast': '\n',
		'Director': '\n',
		'Writers': '\n',
		'default': ', '
	};
	// Whether links found in tokens should be linkifyed.
	var shouldLink = [
		'Director',
		'Writers'
	];
	// Preprocess movie data for our use.
	movieData.Cast.forEach(function (castMember, idx, arr) {
		arr[idx] = '[url=' + castMember.link + ']' + castMember.name + '[/url] - ' + castMember.character;
	});

	if (movieData.Plot) {
		movieData.Description = movieData.Plot;
	}
	if (movieData.Genre) {
		movieData.Genres = movieData.Genre;
	}
	// Use user-written description if possible.
	if (movieData.Storyline) {
		movieData.Description = movieData.Storyline;
	}

	function preprocessMovieDataParam(e, idx, arr) {
		// Do any preprocessing of array elements.
		// if (this === 'Writers') {
		//     ...	
		// }

		if (typeof e === 'string') {
			return;
		}
		if (e.text && e.link) {
			if (shouldLink.indexOf(this) > -1) {
				arr[idx] = '[url=' + e.link + ']' + e.text + '[/url]';
			}
			else {
				arr[idx] = e.text;
			}
			if (arr[idx + 1] && typeof arr[idx + 1] === 'string') {
				arr[idx] += ' ' + arr[idx + 1];
				delete arr[idx + 1];
			}
		}
	}

	for (param in movieData) {
		if (movieData.hasOwnProperty(param)) {
			if (typeof movieData[param] === 'undefined') {
				continue;
			}

			if (typeof movieData[param] === 'string') {
				// Do any preprocessing of the string-based tokens.
				if (param === 'Poster') {
					movieData[param] = movieData[param].replace(/@@.+?(\.\w+)$/, '@@$1');
				}
				continue;
			}

			movieData[param].forEach(preprocessMovieDataParam, param);
			movieData[param] = cleanArray(movieData[param]);
			movieData[param] = movieData[param].join(separators[param] || separators['default']);
		}
	}

	format = tokenize(format, movieData, '-');

	// Add textarea to display data.
	var textarea = document.createElement('textarea');
	textarea.style.width = '90%';
	textarea.addEventListener('click', function () {
		this.select();
	}, false);
	$qs('#footer').appendChild(textarea);
	textarea.textContent = format;
	
	// Helper functions.
	//------------------
	// querySelector.
	function $qs(selector, context){context=context||document;return context.querySelector(selector);}
	// querySelectorAll with slice.
	function $qsa(selector, context){context=context||document;return [].slice.call(context.querySelectorAll(selector));}
	// Remove weird whitespace on textContent.
	function trimFix(str){return str.trim().replace(/\\n/g,'').replace(/\s+/g,' ');}
	// Merge objects with later arguments overwriting previous.
	function merge(){var a={};[].slice.call(arguments).forEach(function(arg){for(var attr in arg){if(arg.hasOwnProperty(attr)){a[attr]=arg[attr];}}});return a;}
	// Tokenizer.
	function tokenize(str,repl,def){return str.replace(/%(.*?)%/g,function(a,b){if(repl.hasOwnProperty(b)&&typeof repl[b]==='string'){return repl[b];}return def||a;});}
	// Array cleaner.
	function cleanArray(arr){return arr.filter(function(n){return n;});}
})();