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authorRossTheRoss <mstrapp@protonmail.com>2020-01-30 16:55:04 -0600
committerRossTheRoss <mstrapp@protonmail.com>2020-01-30 16:55:04 -0600
commit175721a63b426355274fa9e8063f762020ab8362 (patch)
treecf2c1b33233d660c9f50de5e659b9343bb264984 /csci1913/Java/project3/Words.java
parentMake Python thing in Python (diff)
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-package project3;
-//
-// WORDS. An iterator that reads lower case words from a text file.
-//
-// James Moen
-// 19 Apr 17
-//
-
-import java.io.FileReader; // Read Unicode chars from a file.
-import java.io.IOException; // In case there's IO trouble.
-
-// WORDS. Iterator. Read words, represented as STRINGs, from a text file. Each
-// word is the longest possible contiguous series of alphabetic ASCII CHARs.
-
-class Words {
- private int ch; // Last CHAR from READER, as an INT.
- private FileReader reader; // Read CHARs from here.
- private StringBuilder word; // Last word read from READER.
-
- // Constructor. Initialize an instance of WORDS, so it reads words from a file
- // whose pathname is PATH. Throw an exception if we can't open PATH.
-
- public Words(String path) {
- try {
- reader = new FileReader(path);
- ch = reader.read();
- } catch (IOException ignore) {
- throw new IllegalArgumentException("Cannot open '" + path + "'.");
- }
- }
-
- // HAS NEXT. Try to read a WORD from READER, converting it to lower case as we
- // go. Test if we were successful.
-
- public boolean hasNext() {
- word = new StringBuilder();
- while (ch > 0 && !isAlphabetic((char) ch)) {
- read();
- }
- while (ch > 0 && isAlphabetic((char) ch)) {
- word.append(toLower((char) ch));
- read();
- }
- return word.length() > 0;
- }
-
- // IS ALPHABETIC. Test if CH is an ASCII letter.
-
- private boolean isAlphabetic(char ch) {
- return 'a' <= ch && ch <= 'z' || 'A' <= ch && ch <= 'Z';
- }
-
- // NEXT. If HAS NEXT is true, then return a WORD read from READER as a STRING.
- // Otherwise, return an undefined STRING.
-
- public String next() {
- return word.toString();
- }
-
- // READ. Read the next CHAR from READER. Set CH to the CHAR, represented as an
- // INT. If there are no more CHARs to be read from READER, then set CH to -1.
-
- private void read() {
- try {
- ch = reader.read();
- } catch (IOException ignore) {
- ch = -1;
- }
- }
-
- // TO LOWER. Return the lower case ASCII letter which corresponds to the ASCII
- // letter CH.
-
- private char toLower(char ch) {
- if ('a' <= ch && ch <= 'z') {
- return ch;
- } else {
- return (char) (ch - 'A' + 'a');
- }
- }
- // MAIN. For testing. Open a text file whose pathname is the 0th argument from
- // the command line. Read words from the file, and print them one per line.
-
- public static void main(String[] args) {
- Words words = new Words(args[0]);
- while (words.hasNext()) {
- System.out.println("'" + words.next() + "'");
- }
- }
-}