75 lines
2.4 KiB
Java
75 lines
2.4 KiB
Java
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/**
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* Sample luaj program that uses the LuaParser class for parsing, and intercepts the
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* generated ParseExceptions and fills in the file, line and column information where
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* the exception occurred.
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*/
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import java.io.*;
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import org.luaj.vm2.*;
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import org.luaj.vm2.ast.*;
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import org.luaj.vm2.parser.*;
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public class SampleParser {
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static LuaValue NIL = LuaValue.NIL; // Workaround needed to ensure classes load in right order.
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// Sample ParseException subclass that stores the file, line, and column info.
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static public class FileLineColumnParseException extends ParseException {
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private static final long serialVersionUID = 1L;
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public final String file;
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public final int line;
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public final int column;
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public FileLineColumnParseException(String file, int line, int column, String message) {
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super(message);
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this.file = file;
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this.line = line;
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this.column = column;
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}
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}
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static public void main(String[] args) {
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if (args.length == 0) {
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System.out.println("usage: SampleParser luafile");
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return;
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}
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try {
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final String file = args[0];
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// Create a custom LuaParser subclass that intercepts parse exceptions and
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// extracts the line and column number information from the parse token.
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LuaParser parser = new LuaParser(new FileInputStream(file)) {
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/** Generate ParseException. */
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public ParseException generateParseException() {
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Token errortok = token.next;
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int line = errortok.beginLine;
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int column = errortok.beginColumn;
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String mess = (errortok.kind == 0) ? tokenImage[0] : errortok.image;
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return new FileLineColumnParseException(file, line, column, mess);
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}
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};
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// Perform the parsing.
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Chunk chunk = parser.Chunk();
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// Optionally recurse over the parse tree with a custom Visitor instance.
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chunk.accept( new Visitor() {
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// TODO: override Visitor methods here to perform actions on the parse tree.
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} );
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} catch ( FileLineColumnParseException e ) {
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System.out.println( "Parse failed at identified line, column: "+e );
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System.out.println( "File: "+e.file );
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System.out.println( "Line: "+e.line );
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System.out.println( "Column: "+e.column );
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System.out.println( "Message: "+e.getMessage() );
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} catch ( ParseException e ) {
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System.out.println( "Parse failed at unknown location: "+e );
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e.printStackTrace();
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} catch ( IOException e ) {
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System.out.println( "IOException occurred: "+e );
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e.printStackTrace();
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}
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}
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}
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