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htmlParser.java
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htmlParser.java
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/*
* Venkata Harish Kajur 8982
* Jonathan Lysiak 4477
* CS-345
* Homework 6
*/
import java.io.*;
import java.util.*;
/*
* htmlParser will parse through files, create tokens, and build the lexicon
*/
class htmlParser {
private File file;
private BufferedReader br;
private PrintWriter writer;
private List<FileInfo> fileinfoList;
private int attr;
private ParseTokenType ttype;
public List<String> wordList;
public Hashtable<String, Integer> hs;
public int wordID = 1;
/*
* Takes a tokentype as an argument and decides which parser to call
*/
public htmlParser(ParseTokenType ttype){
try {
this.ttype = ttype;
fileinfoList = new ArrayList<FileInfo>();
if(ttype == ParseTokenType.TOKEN)
writer = new PrintWriter("fdsee_token.txt", "UTF8");
else
writer = new PrintWriter("fdsee_tokendebug.txt", "UTF8");
wordList = new ArrayList<String>();
hs = new Hashtable<String, Integer>();
getFileInformation();
for(FileInfo fInfo : fileinfoList){
String fname = fInfo.getFilename();
FileType filetype = fInfo.getFileType();
switch(filetype){
case HTML:
attr = 0;
parseHtmlFile(fname, fInfo.getDocID());
break;
case TEXT:
attr = 0;
parseTextFile(fname, fInfo.getDocID());
break;
default:
break;
}
}
} catch(FileNotFoundException filenotfound){
System.err.println("Error: " + filenotfound);
} catch(Exception ex){
System.err.println("Error: " + ex);
}
}
/*
*
*/
public String getWordByWordID(int index){
String str = (String) (wordList.get(index - 1));
return str;
}
/*
* Converts token status into a numerical for printing of dumpfiles
*/
public int getValueOfTokenStatus(TokenStatus ts){
int n = 0;
switch(ts){
case REGULAR:
n = 0;
break;
case INSIDE_TITLE:
n = 1;
break;
case INSIDE_A:
n = 2;
break;
case INSIDE_H1_3:
n = 3;
break;
case INSIDE_H4_6:
n = 4;
break;
default:
break;
}
return n;
}
/*
* Identifies if a token is a title, anchor, or header tag.
*/
public String getTokenStatus(TokenStatus ts){
String str = "";
int n = 0;
switch(ts){
case REGULAR:
str = "0";
break;
case INSIDE_TITLE:
str = "<TITLE>";
break;
case INSIDE_A:
str = "<A>";
break;
case INSIDE_H1_3:
str = "<H1>";
break;
case INSIDE_H4_6:
str = "<H4>";
break;
default:
break;
}
return str;
}
/*
* Formats output to be written to a text file
*/
public void print(String fname, int docID, StringBuffer str, TokenStatus ts, int n){
int temp = -1;
if(!hs.containsKey(str)){
hs.put(str.toString(), wordID);
}
else{
temp = wordID;
wordID = hs.get(str);
}
switch(ttype){
case TOKEN:
writer.println("(" + docID + ","
+ wordID + "," + n + ","
+ getValueOfTokenStatus(ts) + ")");
break;
case TOKENDEBUG:
writer.println("(" + fname + ","
+ str.toString().toLowerCase() + ","
+ n + "," + getTokenStatus(ts) + ")");
break;
default:
break;
}
if(temp == -1){
wordID++;
} else {
wordID = temp;
}
}
/*
* Parses html files and identifies any special cases
*/
public void parseHtmlFile(String fname, int docID){
try {
File file = new File(fname);
br = new BufferedReader(new FileReader(file));
String line = null;
int wpos = 1;
int chVal;
TokenType tt = TokenType.START_STATE;
TokenStatus ts = TokenStatus.REGULAR;
StringBuffer sbTagName = new StringBuffer();
StringBuffer sbWord = new StringBuffer();
char ch;
int wordOffset = 1;
while((chVal = br.read()) != -1){
ch = (char)chVal;
switch(tt){
case START_STATE:
if(ch == '<'){
tt = TokenType.OPEN_GREAT;
} else if(Character.isLetterOrDigit(ch)){
sbWord.append(ch);
tt = TokenType.WORD;
} else if(Character.isWhitespace(ch)){
tt = TokenType.START_STATE;
} else {
tt = TokenType.USELESS_CHAR;
}
break;
case OPEN_GREAT:
if(Character.isWhitespace(ch)){
tt = TokenType.OPEN_GREAT;
} else if(Character.isLetter(ch)){
tt = TokenType.TAG_NAME;
sbTagName.append(ch);
} else if(ch == '/'){
tt = TokenType.SLASH;
} else if(ch == '!'){
tt = TokenType.BANG;
}
break;
case BANG:
if(ch == '>')
tt = TokenType.CLOSE_GREAT;
break;
case WORD:
if(Character.isLetterOrDigit(ch)){
sbWord.append(ch);
} else if(Character.isWhitespace(ch)){
print(fname, docID, sbWord, ts, wordOffset);
wordOffset++;
sbWord = new StringBuffer();
tt = TokenType.WORD_SPACE;
} else if(ch == '<'){
print(fname, docID, sbWord, ts, wordOffset);
wordOffset++;
sbWord = new StringBuffer();
tt = TokenType.OPEN_GREAT;
}
else {
print(fname, docID, sbWord, ts, wordOffset);
wordOffset++;
sbWord = new StringBuffer();
tt = TokenType.USELESS_CHAR;
}
break;
case WORD_SPACE:
if(Character.isWhitespace(ch)){
tt = TokenType.WORD_SPACE;
} else if(Character.isLetterOrDigit(ch)){
sbWord.append(ch);
tt = TokenType.WORD;
} else if(ch == '<'){
tt = TokenType.OPEN_GREAT;
} else {
tt = TokenType.USELESS_CHAR;
}
break;
case USELESS_CHAR:
if(Character.isLetterOrDigit(ch)){
sbWord.append(ch);
tt = TokenType.WORD;
} else if(ch == '<'){
tt = TokenType.OPEN_GREAT;
}
break;
case SLASH:
if(Character.isLetter(ch)){
sbTagName.append(ch);
tt = TokenType.SLASH_TAG_NAME;
} else
tt = TokenType.BAD_TAG_NAME;
break;
case SLASH_TAG_NAME:
if(Character.isLetterOrDigit(ch)){
sbTagName.append(ch);
tt = TokenType.SLASH_TAG_NAME;
} else if(ch == '>'){
String str = sbTagName.toString().toLowerCase();
if(str.matches("a"))
ts = TokenStatus.REGULAR;
else if(str.equals("title"))
ts = TokenStatus.REGULAR;
else if(str.matches("h[1-3]"))
ts = TokenStatus.REGULAR;
else if(str.matches("h[4-6]"))
ts = TokenStatus.REGULAR;
sbTagName = new StringBuffer();
tt = TokenType.CLOSE_GREAT;
} else
tt = TokenType.BAD_TAG_NAME;
break;
case TAG_NAME:
if(Character.isLetterOrDigit(ch)){
sbTagName.append(ch);
tt = TokenType.TAG_NAME;
} else if(Character.isWhitespace(ch)){
String str = sbTagName.toString().toLowerCase();
if(str.matches("a"))
ts = TokenStatus.INSIDE_A;
else if(str.equals("title"))
ts = TokenStatus.INSIDE_TITLE;
else if(str.matches("h[1-3]"))
ts = TokenStatus.INSIDE_H1_3;
else if(str.matches("h[4-6]"))
ts = TokenStatus.INSIDE_H4_6;
sbTagName = new StringBuffer();
tt = TokenType.OPEN_GREAT_SPACE;
} else if(ch == '>'){
String str = sbTagName.toString().toLowerCase();
if(str.matches("a"))
ts = TokenStatus.INSIDE_A;
else if(str.equals("title"))
ts = TokenStatus.INSIDE_TITLE;
else if(str.matches("h[1-3]"))
ts = TokenStatus.INSIDE_H1_3;
else if(str.matches("h[4-6]"))
ts = TokenStatus.INSIDE_H4_6;
sbTagName = new StringBuffer();
tt = TokenType.CLOSE_GREAT;
} else
tt = TokenType.BAD_TAG_NAME;
break;
case BAD_TAG_NAME:
if(ch == '>')
tt = TokenType.CLOSE_GREAT;
break;
case OPEN_GREAT_SPACE:
if(ch == '>')
tt = TokenType.CLOSE_GREAT;
break;
case CLOSE_GREAT:
if(Character.isLetterOrDigit(ch)){
sbWord.append(ch);
tt = TokenType.WORD;
}else if(Character.isWhitespace(ch)){
tt = TokenType.CLOSE_GREAT;
} else if(ch == '<'){
tt = TokenType.OPEN_GREAT;
}else
tt = TokenType.USELESS_CHAR;
break;
}
}
} catch(Exception ex){
ex.printStackTrace();
}
}
/*
* Parses text files and identifies any special cases
*/
public void parseTextFile(String fname, int docID){
try {
File file = new File(fname);
br = new BufferedReader(new FileReader(file));
String line = null;
int wpos = 1;
while((line = br.readLine()) != null){
line = line.replaceAll("[^A-Za-z0-9]", " ").toLowerCase();
line = line.replaceAll("[ ][ ]*", " ");
line = line.replaceAll("^[ ]*", "");
String[] strArray = line.split(" ");
for(String str : strArray){
if(!str.isEmpty() && str.trim().length() > 0){
wordList.add(str);
int temp = -1;
if(!hs.containsKey(str)){
hs.put(str, wordID);
}
else{
temp = wordID;
wordID = hs.get(str);
}
switch(ttype){
case TOKEN:
writer.println("(" + docID + ","
+ wordID + "," + wpos
+ "," + attr + ")");
break;
case TOKENDEBUG:
writer.println("(" + fname + ","
+ str + "," + wpos
+ "," + attr + ")");
break;
default:
break;
}
if(temp == -1){
wordID++;
} else {
wordID = temp;
}
wpos++;
}
}
}
} catch(Exception ex){
ex.printStackTrace();
}
}
/*
* Takes a string argument and compares to check for filetype
*/
public FileType getFileType(String str){
FileType filetype = null;
switch(str){
case "TEXT":
filetype = FileType.TEXT;
break;
case "HTML":
filetype = FileType.HTML;
break;
default:
filetype = FileType.NSTF;
break;
}
return filetype;
}
/*
* Parses the doclist file and stores the information into a list
*/
public void getFileInformation() throws IOException{
String inputFile = "fdsee_doclist.txt";
FileReader fr = new FileReader(inputFile);
BufferedReader bRead = new BufferedReader(fr);
String line = null;
String[] array = null;
while((line = bRead.readLine()) != null){
array = line.split("\t");
if(array.length == 4){
int docID = Integer.parseInt(array[0]);
String filename = array[1];
String filetypeStr = array[3];
FileType filetype = getFileType(filetypeStr);
fileinfoList.add(new FileInfo(filename, filetype, docID));
}
}
}
/*
* Prints file information to screen
*/
public void print(){
for(FileInfo f: fileinfoList){
System.out.println(f);
}
}
/*
* Reads each line and converts characters to lowercase
*/
public String parse(){
String line = null;
try {
while((line = br.readLine()) != null){
line = line.toLowerCase();
}
} catch(IOException ex){
System.err.println("Error: " + ex);
}
return line;
}
/*
* Closes printwriter instance
*/
public void closeWriter(){
writer.close();
}
}