Text Frequency Analyzer with ASIN Page Support

Extract text from specific spans based on page URL, remove stop words, and do word frequency analysis.
当前为 2024-08-22 提交的版本，查看最新版本。
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// ==UserScript==
// @name         Text Frequency Analyzer with ASIN Page Support
// @namespace    http://tampermonkey.net/
// @version      1.9
// @description  Extract text from specific spans based on page URL, remove stop words, and do word frequency analysis.
// @author       Your Name
// @match        https://www.amazon.com/gp/bestsellers*
// @match        https://www.amazon.com/*/dp/*
// @match        https://www.amazon.com/dp/*
// @match        https://www.amazon.com/s?k=*
// @match        https://www.amazon.com/s?*

// @license MIT
// ==/UserScript==

(function () {
    'use strict';

    const stopWords = new Set([
        'i', 'me', 'my', 'myself', 'we', 'our', 'ours', 'ourselves', 'you', 'your', 'yours', 'yourself', 'yourselves',
        'he', 'him', 'his', 'himself', 'she', 'her', 'hers', 'herself', 'it', 'its', 'itself', 'they', 'them', 'their',
        'theirs', 'themselves', 'what', 'which', 'who', 'whom', 'this', 'that', 'these', 'those', 'am', 'is', 'are', 'was',
        'were', 'be', 'been', 'being', 'have', 'has', 'had', 'having', 'do', 'does', 'did', 'doing', 'a', 'an', 'the', 'and',
        'but', 'if', 'or', 'because', 'as', 'until', 'while', 'of', 'at', 'by', 'for', 'with', 'about', 'against', 'between',
        'into', 'through', 'during', 'before', 'after', 'above', 'below', 'to', 'from', 'up', 'down', 'in', 'out', 'on',
        'off', 'over', 'under', 'again', 'further', 'then', 'once', 'here', 'there', 'when', 'where', 'why', 'how', 'all',
        'any', 'both', 'each', 'few', 'more', 'most', 'other', 'some', 'such', 'no', 'nor', 'not', 'only', 'own', 'same',
        'so', 'than', 'too', 'very', 's', 't', 'can', 'will', 'just', 'don', 'should', 'now'
    ]);

    // Function to extract text from all matching spans based on URL
    function extractText() {
        let spans;
        const url = window.location.href;

        if (url.includes('/gp/bestsellers')) {
            spans = document.querySelectorAll('._cDEzb_p13n-sc-css-line-clamp-3_g3dy1');
        } else if (url.includes('/s?k=')) {
            spans = document.querySelectorAll('.a-size-base-plus.a-color-base.a-text-normal, .a-size-medium.a-color-base.a-text-normal');
        } else if (url.includes('/dp/')) { // ASIN product page
            const titleElement = document.getElementById('productTitle');
            const miniElements = document.querySelectorAll('.a-unordered-list.a-vertical.a-spacing-mini .a-spacing-mini');
            let textContent = titleElement ? titleElement.innerText : '';
            miniElements.forEach(el => {
                textContent += ' ' + el.innerText;
            });
            return textContent.trim();
        } else {
            alert('This script is not configured for this page.');
            return '';
        }

        let textContent = '';
        spans.forEach(span => {
            textContent += span.innerText + ' ';
        });
        return textContent.trim();
    }

    // Function to clean text but keep meaningful symbols
    function cleanText(text) {
        // Retain certain symbols while removing others
        return text.toLowerCase()
            .replace(/[^a-z0-9\s\/"'.-]/g, '')  // Retain letters, digits, spaces, /, ", ', ., -
            .replace(/\s+/g, ' ')  // Replace multiple spaces with a single space
            .trim();
    }

    // Function to clean, remove stop words, and split text into words
    function getWords(text, removeStopWords = true) {
        const words = cleanText(text).split(/\s+/).filter(Boolean);
        if (removeStopWords) {
            return words.filter(word => !stopWords.has(word));
        }
        return words;
    }

    // Function to count word frequencies
    function countFrequencies(words, n) {
        const freqMap = new Map();
        for (let i = 0; i <= words.length - n; i++) {
            const phrase = words.slice(i, i + n).join(' ');
            freqMap.set(phrase, (freqMap.get(phrase) || 0) + 1);
        }
        return Array.from(freqMap.entries()).sort((a, b) => b[1] - a[1]).slice(0, 10);
    }

    // Function to display the frequency analysis results
    function displayResults(results) {
        const resultDiv = document.createElement('div');
        resultDiv.style.position = 'fixed';
        resultDiv.style.top = '10px';
        resultDiv.style.right = '10px';
        resultDiv.style.backgroundColor = 'white';
        resultDiv.style.border = '1px solid black';
        resultDiv.style.padding = '10px';
        resultDiv.style.zIndex = '10000';
        resultDiv.style.maxHeight = '90vh';
        resultDiv.style.overflowY = 'auto';
        resultDiv.innerHTML = '<h2>Word Frequency Analysis</h2>';

        results.forEach(([label, data]) => {
            const title = document.createElement('h3');
            title.textContent = label;
            resultDiv.appendChild(title);
            const list = document.createElement('ul');
            data.forEach(([phrase, count]) => {
                const listItem = document.createElement('li');
                listItem.textContent = `${phrase}: ${count}`;
                list.appendChild(listItem);
            });
            resultDiv.appendChild(list);
        });

        document.body.appendChild(resultDiv);
    }

    // Function to perform the word frequency analysis
    function analyzeText() {
        const text = extractText();
        if (!text) {
            alert('No text found in the specified spans.');
            return;
        }

        const wordsForSingle = getWords(text); // Remove stop words for single word frequency
        const wordsForPhrases = getWords(text, false); // Keep stop words for phrase frequency

        const results = [
            ['Top 10 Single Words', countFrequencies(wordsForSingle, 1)],
            ['Top 10 Two-Word Phrases', countFrequencies(wordsForPhrases, 2)],
            ['Top 10 Three-Word Phrases', countFrequencies(wordsForPhrases, 3)],
            ['Top 10 Four-Word Phrases', countFrequencies(wordsForPhrases, 4)]
        ];

        displayResults(results);
    }

    // Add a button to the page to trigger the analysis
    const analyzeButton = document.createElement('button');
    analyzeButton.textContent = 'Analyze Text Frequency';
    analyzeButton.style.position = 'fixed';
    analyzeButton.style.bottom = '10px';
    analyzeButton.style.right = '10px';
    analyzeButton.style.zIndex = '10000';
    analyzeButton.style.padding = '10px 20px';
    analyzeButton.style.backgroundColor = '#007bff';
    analyzeButton.style.color = 'white';
    analyzeButton.style.border = 'none';
    analyzeButton.style.borderRadius = '5px';
    analyzeButton.style.cursor = 'pointer';

    analyzeButton.addEventListener('click', analyzeText);

    document.body.appendChild(analyzeButton);
})();
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