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package bjc.utils.parserutils;
import java.io.LineNumberReader;
import java.io.Reader;
import java.util.NoSuchElementException;
import java.util.Scanner;
import java.util.function.Consumer;
import java.util.regex.Pattern;
/**
* Implements reading numbered blocks from a source.
*
* A block is a series of characters, seperated by some regular expression.
*
* 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 BlockReader implements AutoCloseable {
/**
* Represents a block of text read in from a source.
*
* @author EVE
*
*/
public static class Block {
/**
* The contents of this block.
*/
public final String contents;
/**
* The line of the source this block started on.
*/
public final int startLine;
/**
* The line of the source this block ended on.
*/
public final int endLine;
/**
* The number of this block.
*/
public final int blockNo;
/**
* Create a new block.
*
* @param blockNo
* The number of this block.
* @param contents
* The contents of this block.
* @param startLine
* The line this block started on.
* @param endLine
* The line this block ended.
*/
public Block(int blockNo, String contents, int startLine, int endLine) {
this.contents = contents;
this.startLine = startLine;
this.endLine = endLine;
this.blockNo = blockNo;
}
@Override
public int hashCode() {
final int prime = 31;
int result = 1;
result = prime * result + blockNo;
result = prime * result + ((contents == null) ? 0 : contents.hashCode());
result = prime * result + endLine;
result = prime * result + startLine;
return result;
}
@Override
public boolean equals(Object obj) {
if(this == obj) return true;
if(obj == null) return false;
if(!(obj instanceof Block)) return false;
Block other = (Block) obj;
if(blockNo != other.blockNo) return false;
if(contents == null) {
if(other.contents != null) return false;
} else if(!contents.equals(other.contents)) return false;
if(endLine != other.endLine) return false;
if(startLine != other.startLine) return false;
return true;
}
@Override
public String toString() {
return String.format("Block #%d (from lines %d to %d) length: %d characters", blockNo, endLine,
startLine, contents.length());
}
}
/*
* I/O source for blocks.
*/
private LineNumberReader lnReader;
private Scanner blockReader;
/*
* The current block.
*/
private Block currBlock;
private int blockNo;
/**
* 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 BlockReader(String blockDelim, Reader source) {
lnReader = new LineNumberReader(source);
blockReader = new Scanner(lnReader);
String pattern = String.format("(?:%s)|\\Z", blockDelim);
Pattern pt = Pattern.compile(pattern, Pattern.MULTILINE);
blockReader.useDelimiter(pt);
}
/**
* Check if this reader has an available block.
*
* @return Whether or not another block is available.
*/
public boolean hasNextBlock() {
return blockReader.hasNext();
}
/**
* Get the current block.
*
* @return The current block, or null if there is no current block.
*/
public Block getBlock() {
return currBlock;
}
/**
* Move to the next block.
*
* @return Whether or not the next block was succesfully read.
*/
public boolean nextBlock() {
try {
int blockStartLine = lnReader.getLineNumber();
String blockContents = blockReader.next();
int blockEndLine = lnReader.getLineNumber();
blockNo += 1;
currBlock = new Block(blockNo, blockContents, blockStartLine, blockEndLine);
return true;
} catch(NoSuchElementException nseex) {
return false;
}
}
/**
* Execute an action for each remaining block.
*
* @param action
* The action to execute for each block
*/
public void forEachBlock(Consumer<Block> action) {
while(hasNextBlock()) {
nextBlock();
action.accept(currBlock);
}
}
/**
* Retrieve the number of blocks that have been read so far.
*
* @return The number of blocks read so far.
*/
public int getBlockCount() {
return blockNo;
}
@Override
public void close() throws Exception {
blockReader.close();
lnReader.close();
}
}
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