From c82e3b3b2de0633317ec8fc85925e91422820597 Mon Sep 17 00:00:00 2001
From: "Benjamin J. Culkin" <bjculkin@mix.wvu.edu>
Date: Sun, 8 Oct 2017 22:39:59 -0300
Subject: Start splitting into maven modules

---
 .../utils/ioutils/blocks/SimpleBlockReader.java    | 115 +++++++++++++++++++++
 1 file changed, 115 insertions(+)
 create mode 100644 base/src/main/java/bjc/utils/ioutils/blocks/SimpleBlockReader.java

(limited to 'base/src/main/java/bjc/utils/ioutils/blocks/SimpleBlockReader.java')

diff --git a/base/src/main/java/bjc/utils/ioutils/blocks/SimpleBlockReader.java b/base/src/main/java/bjc/utils/ioutils/blocks/SimpleBlockReader.java
new file mode 100644
index 0000000..734bde8
--- /dev/null
+++ b/base/src/main/java/bjc/utils/ioutils/blocks/SimpleBlockReader.java
@@ -0,0 +1,115 @@
+package bjc.utils.ioutils.blocks;
+
+import java.io.IOException;
+import java.io.LineNumberReader;
+import java.io.Reader;
+import java.util.NoSuchElementException;
+import java.util.Scanner;
+import java.util.regex.Pattern;
+
+import bjc.utils.funcutils.StringUtils;
+/**
+ * Simple implementation of {@link BlockReader}
+ *
+ * NOTE: The EOF marker is always treated as a delimiter. You are expected to
+ * handle blocks that may be shorter than you expect.
+ *
+ * @author EVE
+ *
+ */
+public class SimpleBlockReader implements BlockReader {
+	/*
+	 * I/O source for blocks.
+	 */
+	private final Scanner blockReader;
+
+	/*
+	 * The current block.
+	 */
+	private Block currBlock;
+
+	/*
+	 * Info about the current block.
+	 */
+	private int blockNo;
+	private int lineNo;
+
+	/**
+	 * Create a new block reader.
+	 *
+	 * @param blockDelim
+	 *                The pattern that separates blocks. Note that the end
+	 *                of file is always considered to end a block.
+	 *
+	 * @param source
+	 *                The source to read blocks from.
+	 */
+	public SimpleBlockReader(final String blockDelim, final Reader source) {
+		blockReader = new Scanner(source);
+
+		final String pattern = String.format("(?:%s)|\\Z", blockDelim);
+		final Pattern pt = Pattern.compile(pattern, Pattern.MULTILINE);
+
+		blockReader.useDelimiter(pt);
+
+		lineNo = 1;
+	}
+
+	@Override
+	public boolean hasNextBlock() {
+		return blockReader.hasNext();
+	}
+
+	@Override
+	public Block getBlock() {
+		return currBlock;
+	}
+
+	@Override
+	public boolean nextBlock() {
+		try {
+			/*
+			 * Read in a new block, and keep the line numbers sane.
+			 */
+			final int blockStartLine = lineNo;
+			final String blockContents = blockReader.next();
+			final int blockEndLine = lineNo + StringUtils.countMatches(blockContents, "\\R");
+
+			lineNo = blockEndLine;
+			blockNo += 1;
+
+			currBlock = new Block(blockNo, blockContents, blockStartLine, blockEndLine);
+
+			return true;
+		} catch (final NoSuchElementException nseex) {
+			currBlock = null;
+
+			return false;
+		}
+	}
+
+	@Override
+	public int getBlockCount() {
+		return blockNo;
+	}
+
+	@Override
+	public void close() throws IOException {
+		blockReader.close();
+	}
+
+	/**
+	 * Set the delimiter used to separate blocks.
+	 *
+	 * @param delim
+	 *                The delimiter used to separate blocks.
+	 */
+	public void setDelimiter(final String delim) {
+		blockReader.useDelimiter(delim);
+	}
+
+	@Override
+	public String toString() {
+		return String.format("SimpleBlockReader [currBlock=%s, blockNo=%s]", currBlock, blockNo);
+	}
+}
-- 
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