64 lines
2.4 KiB
Java
64 lines
2.4 KiB
Java
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// Stuart Reges
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// 3/10/04
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//
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// GrammarMain contains a main program that prompts a user for the name of a
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// grammar file and then gives the user the opportunity to generate random
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// versions of various elements of the grammar.
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import java.io.*;
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import java.util.*;
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public class GrammarMain {
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public static void main(String[] args) throws FileNotFoundException {
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Scanner console = new Scanner(System.in);
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System.out.println("Welcome to the cs145 random sentence generator.");
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System.out.println();
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// open grammar file
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System.out.print("What is the name of the grammar file? ");
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String fileName = console.nextLine();
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Scanner input = new Scanner(new File(fileName));
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// read the grammar file and construct the grammar solver
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List<String> grammar = new ArrayList<String>();
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while (input.hasNextLine())
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grammar.add(input.nextLine());
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GrammarSolver solver =
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new GrammarSolver(Collections.unmodifiableList(grammar));
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showResults(console, solver);
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}
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// pre : console open for console reading, solver initialized
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// post: allows the user to repeatedly pick a grammar element to generate
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public static void showResults(Scanner console, GrammarSolver solver) {
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for(;;) {
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System.out.println();
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System.out.println("Available symbols to generate are:");
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System.out.println(solver.getSymbols());
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System.out.print("What do you want generated (return to quit)? ");
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String target = console.nextLine();
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if (target.length() == 0)
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break;
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if (!solver.grammarContains(target))
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System.out.println("Illegal symbol");
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else {
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System.out.print("How many do you want me to generate? ");
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if (!console.hasNextInt())
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System.out.println("that's not an integer");
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else {
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int number = console.nextInt();
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if (number < 0)
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System.out.println("no negatives allowed");
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else {
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String[] answers = solver.generate(target, number);
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for (int i = 0; i < number; i++)
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System.out.println(answers[i]);
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}
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}
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console.nextLine(); // to position to next line
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}
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}
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}
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}
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