Search Multiple Strings for Words from a Database?

in Programming Questions • 1 year ago

I am working on a program that will search through news stories of an XML feed, and display a red overlay on stories that have negative-connotation words, blue on positive-connotation, purple on both, and grey if a string contains neither positive or negative words.

I was wondering the best way to implement searching through strings, I was a assuming an "if" statement would work best but I have gotten stuck in my programming. I'm somewhat of a newbie to processing, but I love to learn more!

I would appreciate any input, thanks!

///load
float r;
float g;
float b;
// Array to store titles
String[] titles;
PFont font;
void setup() {
size(700, 700);
background(0);
noStroke();
// Setup font
font = loadFont("MarketDeco-14.vlw");
textFont(font, 14);
// Load RSS feed
String url = "http://feeds.bbci.co.uk/news/rss.xml";
XMLElement rss = new XMLElement(this, url);
// Get title of each element
XMLElement[] titleXMLElements = rss.getChildren("channel/item/title");
titles = new String[titleXMLElements.length];
for (int i = 0; i < titleXMLElements.length; i++) {
String title = titleXMLElements[i].getContent();
// Store title in array for later use
titles[i] = title;
println(titles[i]);
//change fill color
if(titles[i].contains("deaths")){
r = 255;
g = 0;
b = 0;
}
else{
r = 255;
g = 0;
b = 0;
}
}
}
void draw() {
background(255);
// Draw all titles with bars and colors depending on its length
for (int i = 0; i < titles.length; i++) {
float y = (i+1) * 16;
//square icon
fill(r, g, b);
rect(8, y - 11, 14, 14);
//overlay over text
fill(r, g, b, 90);
rect(23, y - 11, titles[i].length() * 8.4, 14);
//text
fill(0, 220);
text(titles[i], 26, y);
}
}

Replies(6)

Chrisir

Re: Search Multiple Strings for Words from a Database?

1 year ago

In theory

have

String[] badWords={"war", "hate", "weapon"};

and a niceWords array

Now in your for loop in draw() have two other for loops to go thru good&bad words

A for Loop with numBadWords as its var.

Then have

if (titles[i].contains(badWords[numBadWords])) {

foundBadWords=true;

break; // ?

}

Same for niceWords

Then eval foundBadWords and foundNiceWords and Set colors.

kylecesmat

Re: Search Multiple Strings for Words from a Database?

1 year ago

When you say to go through good&bad words what do you mean by that?

Also, why would I need to find the number of bad words?

wouldn't a simple function like this work? Where badWords is an array, so that if titles.[i} contains any of the items from the array it would evaluate to true?

if(titles[i].contains(badWords)) {

setBadWords=true;

break;

r=255;

g=0;

b=0;

}

else(titles[i].contains(goodWords)) [

setGoodWords=true;

break;

r=0;

g=0;

b=0;

}

I'm just trying to simplify it assuming titles[i] already contains all the titles in an array.

PhiLho

Re: Search Multiple Strings for Words from a Database?

1 year ago

There is no contains() for arrays, but there is one for array lists...

Chrisir

Re: Search Multiple Strings for Words from a Database?

1 year ago

Try it

Since badWords is an Array it won't work

Go thru - I meant for loop thru it elements

You have to check every title against all badWords, both One by One

teddybot

Re: Search Multiple Strings for Words from a Database?

1 year ago

Stringtokenizer may help.
You may have a text file of words.
It reads the words file and puts the words into an array.

When the news is read in you tokenize that into an array and check each word against it.

If your bad word list will have thousands of variations you may want to check into harder methods such as Grammars if peformance becomes an issue. The good part about some techniques is you don't have to iterate through all data to compare strings due to it being stored in a hierarchy.
http://www.youtube.com/watch?v=sk0dSQ6snnw
http://www.youtube.com/watch?v=uvXygqPudsw

All of the bad words could possibly be stored in the grammar.
The web content is fed in. Something such as only the nodes that became active in the grammar will respond to the

Chrisir

Re: Search Multiple Strings for Words from a Database?

1 year ago

I am really Not an expert on this

Is it necessary to go Real Time?

Can'tyou pre-calculate and store data?

You could also use Multi-Thread to have 3 collect data and one to display it (depending on your machine)

I agree that a double for Loop I suggested is very slow

Instead you could join the test data e.g. with # and then use if (test.contains("#"+badWords[i]+"#") or so.

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