From 7a73162607544204032aa66cce755daf21edebda Mon Sep 17 00:00:00 2001
From: Matt Strapp <matt@mattstrapp.net>
Date: Tue, 24 May 2022 11:18:46 -0500
Subject: Graduate

Signed-off-by: Matt Strapp <matt@mattstrapp.net>
---
 csci1913/Java/project3/Words.java | 90 +++++++++++++++++++++++++++++++++++++++
 1 file changed, 90 insertions(+)
 create mode 100644 csci1913/Java/project3/Words.java

(limited to 'csci1913/Java/project3/Words.java')

diff --git a/csci1913/Java/project3/Words.java b/csci1913/Java/project3/Words.java
new file mode 100644
index 0000000..0487267
--- /dev/null
+++ b/csci1913/Java/project3/Words.java
@@ -0,0 +1,90 @@
+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() + "'");
+        }
+    }
+}
-- 
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