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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 Laurie White
- * @version April 2012
- *
- */
- public class Magpie4
- {
- /**
- * 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 (statement.length() == 0)
- {
- response = "Say something, please.";
- }
- else 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.";
- }
- // Responses which require transformations
- else if (findKeyword(statement, "I want to", 0) >= 0)
- {
- response = transformIWantToStatement(statement);
- }
- else if (findKeyword(statement, "I want", 0) >= 0)
- {
- response = transformIWantStatement(statement);
- }
- else
- {
- // Look for a two word (you <something> me)
- // pattern
- int psn = findKeyword(statement, "you", 0);
- int psnI = findKeyword(statement, "I", 0);
- if (psn >= 0
- && findKeyword(statement, "me", psn) >= 0)
- {
- response = transformYouMeStatement(statement);
- }else if(psnI>=0&&findKeyword(statement, "you", psnI+1)>=0){
- response=transformIYouStatement(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)
- {
- // 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 to", 0);
- int startSubstring=psn + 9;
- String restOfStatement = statement.substring(psn + startSubstring).trim();
- return "What would it mean to " + restOfStatement + "?";
- }
- /**
- * 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 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);
- int startSubstring=psn + 6;
- String restOfStatement = statement.substring(psn + startSubstring).trim();
- return "Why would you want" + restOfStatement + "?";
- }
- /**
- * Take a statement with "you <something> me" and transform it into
- * "What makes you think that I <something> you?"
- * @param statement the user statement, assumed to contain "you" followed by "me"
- * @return the transformed statement
- */
- 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?";
- }
- /**
- * Take a statement with "you <something> me" and transform it into
- * "What makes you think that I <something> you?"
- * @param statement the user statement, assumed to contain "you" followed by "me"
- * @return the transformed statement
- */
- private String transformIYouStatement(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 psnOfI = findKeyword (statement, "I", 0);
- int psnOfYou = findKeyword (statement, "you", psnOfI + 1);
- String restOfStatement = statement.substring(psnOfI + 3, psnOfYou).trim();
- return "Why do you want to " + restOfStatement + " me?";
- }
- /**
- * 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 = 4;
- 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.";
- }
- return response;
- }
- }
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