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Magpie3
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Magpie3
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/**
* A program to carry on conversations with a human user.
* This version:
*<ul><li>
* Uses advanced search for keywords
*</li><li>
* Will transform statements as well as react to keywords
*</li></ul>
* @author *****
* @version *****
*
*/
public class Magpie3
{
/**
* Get a default greeting
* @return a greeting
*/
public String getGreeting()
{
return "Hello, let's talk.";
}
/**
* Gives a response to a user statement
*
* @param statement
* the user statement
* @return a response based on the rules given
*/
public String getResponse(String statement)
{
String response = "";
if (findKeyword(statement, "no") >= 0)
{
response = "Why so negative?";
}
else if (findKeyword(statement, "mother") >= 0
|| findKeyword(statement, "father") >= 0
|| findKeyword(statement, "sister") >= 0
|| findKeyword(statement, "brother") >= 0)
{
response = "Tell me more about your family.";
}
else if (findKeyword(statement, "Dog") >= 0
|| findKeyword(statement, "dog") >= 0
|| findKeyword(statement, "Cat") >= 0
|| findKeyword(statement, "cat") >= 0)
{
response = "tell me more about your pets";
}
else if (findKeyword(statement, "*****") >= 0
|| findKeyword(statement, "*****") >= 0
|| findKeyword(statement, "*****") >= 0
|| findKeyword(statement, "*****") >= 0)
{
response = "what a great name";
}
else if (findKeyword(statement, "School") >= 0
|| findKeyword(statement, "school") >= 0)
{
response = "I hate school what about you?";
}
else if (statement.length() <= 0)
{
response = "you havent said anything...";
}
else if (findKeyword(statement, "morning") >= 0
|| findKeyword(statement, "Morning") >= 0)
{
response = "Good morning!";
}
else if (findKeyword(statement, "Lemons") >= 0
|| findKeyword(statement, "lemons") >= 0)
{
response = "yum... lemons";
}
else if (findKeyword(statement, "I want to") >= 0)
{
response = transformIWantToStatement(statement);
}
else if (findKeyword(statement, "I want") >= 0)
{
response = transformIWantStatement(statement);
}
else if (findKeyword(statement, "I", 0) >= 0 && findKeyword(statement, "you", 0) >= 0)
{
response = tranformIYouStatement(statement);
}
else if (findKeyword(statement, "you", 0) >= 0 && findKeyword(statement, "me", 0) >= 0)
{
response = transformYouMeStatement(statement);
}
// Responses which require transformations
else
{
// Look for a two word (you <something> me)
// pattern
int psn = findKeyword(statement, "you", 0);
if (psn >= 0
&& findKeyword(statement, "me", psn) >= 0)
{
response = transformYouMeStatement(statement);
}
else
{
response = getRandomResponse();
}
}
return response;
}
/**
* Take a statement with "I want to <something>." and transform it into
* "What would it mean to <something>?"
* @param statement the user statement, assumed to contain "I want to"
* @return the transformed statement
*/
private String transformIWantToStatement(String statement)
{
statement = statement.trim();
String lastChar = statement.substring(statement
.length() - 1);
if (lastChar.equals("."))
{
statement = statement.substring(0, statement
.length() - 1);
}
int psn = findKeyword (statement, "I want to", 0);
String restOfStatement = statement.substring(psn + 9).trim();
return "what would it mean to " + restOfStatement + " ?";
}
private String transformIWantStatement(String statement)
{
// Remove the final period, if there is one
statement = statement.trim();
String lastChar = statement.substring(statement
.length() - 1);
if (lastChar.equals("."))
{
statement = statement.substring(0, statement
.length() - 1);
}
int psn = findKeyword (statement, "I want", 0);
//same as IwantTo however we alter to add 6 to psn as "I want" is six characters
String restOfStatement = statement.substring(psn + 6).trim();
//what the response would be if conditions are true
return "Would you really be happy if you had " + restOfStatement + "?";
}
private String tranformIYouStatement(String statement)
{
statement = statement.trim();
String lastChar = statement.substring(statement.length() -1);
if (lastChar.equals("."))
{
statement = statement.substring(0, statement
.length() - 1);
}
//get an index of the first statement of I
int psnI = findKeyword(statement, "i", 0);
//get an index of the first statement of "You"
int psnYou = findKeyword(statement, "you", psnI + 1);
//find the substring in beween I and You using our indexes we established, "middle of statement " is the characters between the two instances
String middleOfStatement = statement.substring(psnI + 1, psnYou).trim();
//what response should me under right conditions
return "why do you " + middleOfStatement + " me?";
}
private String transformYouMeStatement(String statement)
{
// Remove the final period, if there is one
statement = statement.trim();
String lastChar = statement.substring(statement
.length() - 1);
if (lastChar.equals("."))
{
statement = statement.substring(0, statement
.length() - 1);
}
int psnOfYou = findKeyword (statement, "you", 0);
int psnOfMe = findKeyword (statement, "me", psnOfYou + 3);
String restOfStatement = statement.substring(psnOfYou + 3, psnOfMe).trim();
return "What makes you think that I " + restOfStatement + " you?";
}
/** ADD THIS
* Take a statement with "I <something> you" and transform it into
* "Why do you <something> me?"
* @param statement the user statement, assumed to contain "I" followed by something "you"
* @return the transformed statement
*/
private String transformIYouStatement(String statement)
{
// ADD CODE HERE
return "Why do you...";
}
/**
* Search for one word in phrase. The search is not case sensitive.
* This method will check that the given goal is not a substring of a longer string
* (so, for example, "I know" does not contain "no").
* @param statement the string to search
* @param goal the string to search for
* @param startPos the character of the string to begin the search at
* @return the index of the first occurrence of goal in statement or -1 if it's not found
*/
private int findKeyword(String statement, String goal, int startPos)
{
String phrase = statement.trim();
// The only change to incorporate the startPos is in the line below
int psn = phrase.toLowerCase().indexOf(goal.toLowerCase(), startPos);
// Refinement--make sure the goal isn't part of a word
while (psn >= 0)
{
// Find the string of length 1 before and after the word
String before = " ", after = " ";
if (psn > 0)
{
before = phrase.substring (psn - 1, psn).toLowerCase();
}
if (psn + goal.length() < phrase.length())
{
after = phrase.substring(psn + goal.length(), psn + goal.length() + 1).toLowerCase();
}
// If before and after aren't letters, we've found the word
if (((before.compareTo ("a") < 0 ) || (before.compareTo("z") > 0)) // before is not a letter
&& ((after.compareTo ("a") < 0 ) || (after.compareTo("z") > 0)))
{
return psn;
}
// The last position didn't work, so let's find the next, if there is one.
psn = phrase.indexOf(goal.toLowerCase(), psn + 1);
}
return -1;
}
/**
* Search for one word in phrase. The search is not case sensitive.
* This method will check that the given goal is not a substring of a longer string
* (so, for example, "I know" does not contain "no"). The search begins at the beginning of the string.
* @param statement the string to search
* @param goal the string to search for
* @return the index of the first occurrence of goal in statement or -1 if it's not found
*/
private int findKeyword(String statement, String goal)
{
return findKeyword (statement, goal, 0);
}
/**
* Pick a default response to use if nothing else fits.
* @return a non-committal string
*/
private String getRandomResponse()
{
final int NUMBER_OF_RESPONSES = 6;
double r = Math.random();
int whichResponse = (int)(r * NUMBER_OF_RESPONSES);
String response = "";
if (whichResponse == 0)
{
response = "Interesting, tell me more.";
}
else if (whichResponse == 1)
{
response = "Hmmm.";
}
else if (whichResponse == 2)
{
response = "Do you really think so?";
}
else if (whichResponse == 3)
{
response = "You don't say.";
}
else if (whichResponse == 4)
{
response = "really?";
}
else if (whichResponse == 5)
{
response = "NO way";
}
return response;
}
}