plagarism detector.py

from flask import Flask, request, render_template
import re
import math

app = Flask("__name__")

q = ""

@app.route("/")
def loadPage():
	return render_template('initial.html', query="")

@app.route("/", methods=['POST'])
def cosineSimilarity():
	
	universalSetOfUniqueWords = []
	matchPercentage = 0






	inputQuery = request.form['query']
	lowercaseQuery = inputQuery.lower()

	queryWordList = re.sub("[^\w]", " ",lowercaseQuery).split()			#Replace punctuation by space and split
	# queryWordList = map(str, queryWordList)					#This was causing divide by zero error

	for word in queryWordList:
		if word not in universalSetOfUniqueWords:
			universalSetOfUniqueWords.append(word)








	fd = open("database1.txt", "r")
	database1 = fd.read().lower()

	databaseWordList = re.sub("[^\w]", " ",database1).split()	#Replace punctuation by space and split
	# databaseWordList = map(str, databaseWordList)			#And this also leads to divide by zero error

	for word in databaseWordList:
		if word not in universalSetOfUniqueWords:
			universalSetOfUniqueWords.append(word)

	

	queryTF = []
	databaseTF = []

	for word in universalSetOfUniqueWords:
		queryTfCounter = 0
		databaseTfCounter = 0

		for word2 in queryWordList:
			if word == word2:
				queryTfCounter += 1
		queryTF.append(queryTfCounter)

		for word2 in databaseWordList:
			if word == word2:
				databaseTfCounter += 1
		databaseTF.append(databaseTfCounter)

	dotProduct = 0
	for i in range (len(queryTF)):
		dotProduct += queryTF[i]*databaseTF[i]

	queryVectorMagnitude = 0
	for i in range (len(queryTF)):
		queryVectorMagnitude += queryTF[i]**2
	queryVectorMagnitude = math.sqrt(queryVectorMagnitude)

	databaseVectorMagnitude = 0
	for i in range (len(databaseTF)):
		databaseVectorMagnitude += databaseTF[i]**2
	databaseVectorMagnitude = math.sqrt(databaseVectorMagnitude)

	matchPercentage = (float)(dotProduct / (queryVectorMagnitude * databaseVectorMagnitude))*100

	'''
	print queryWordList
	print
	print databaseWordList
	print queryTF
	print
	print databaseTF
	'''

	output = "Input query text matches %0.02f%% with database."%matchPercentage

	return render_template('index.html', query=inputQuery, output=output)

app.run()