Parser.frame

/*-------------------------------------------------------------------------
Compiler Generator Coco/R,
Copyright (c) 1990, 2004 Hanspeter Moessenboeck, University of Linz
extended by M. Loeberbauer & A. Woess, Univ. of Linz
ported from C# to Java by Wolfgang Ahorner
with improvements by Pat Terry, Rhodes University

This program is free software; you can redistribute it and/or modify it 
under the terms of the GNU General Public License as published by the 
Free Software Foundation; either version 2, or (at your option) any 
later version.

This program is distributed in the hope that it will be useful, but 
WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY 
or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License 
for more details.

You should have received a copy of the GNU General Public License along 
with this program; if not, write to the Free Software Foundation, Inc., 
59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.

As an exception, it is allowed to write an extension of Coco/R that is
used as a plugin in non-free software.

If not otherwise stated, any source code generated by Coco/R (other than 
Coco/R itself) does not fall under the GNU General Public License.
------------------------------------------------------------------------*/
-->begin

public class Parser {
-->constants
	static final boolean T = true;
	static final boolean x = false;
	static final int minErrDist = 2;

	public Token t;    // last recognized token
	public Token la;   // lookahead token
	int errDist = minErrDist;
	
	public Scanner scanner;
	public Errors errors;

	-->declarations

	public Parser(Scanner scanner) {
		this.scanner = scanner;
		errors = new Errors();
	}

	void SynErr (int n) {
		if (errDist >= minErrDist) errors.SynErr(la.line, la.col, n);
		errDist = 0;
	}

	public void SemErr (String msg) {
		if (errDist >= minErrDist) errors.SemErr(t.line, t.col, msg);
		errDist = 0;
	}
	
	void Get () {
		for (;;) {
			t = la;
			la = scanner.Scan();
			if (la.kind <= maxT) {
				++errDist;
				break;
			}
-->pragmas
			la = t;
		}
	}
	
	void Expect (int n) {
		if (la.kind==n) Get(); else { SynErr(n); }
	}
	
	boolean StartOf (int s) {
		return set[s][la.kind];
	}
	
	void ExpectWeak (int n, int follow) {
		if (la.kind == n) Get();
		else {
			SynErr(n);
			while (!StartOf(follow)) Get();
		}
	}
	
	boolean WeakSeparator (int n, int syFol, int repFol) {
		int kind = la.kind;
		if (kind == n) { Get(); return true; }
		else if (StartOf(repFol)) return false;
		else {
			SynErr(n);
			while (!(set[syFol][kind] || set[repFol][kind] || set[0][kind])) {
				Get();
				kind = la.kind;
			}
			return StartOf(syFol);
		}
	}
	
-->productions

	public void Parse() {
		la = new Token();
		la.val = "";		
		Get();
-->parseRoot
	}

	private static final boolean[][] set = {
-->initialization
	};
} // end Parser


class Errors {
	public int count = 0;                                    // number of errors detected
	public java.io.PrintStream errorStream = System.out;     // error messages go to this stream
	public String errMsgFormat = "-- line {0} col {1}: {2}"; // 0=line, 1=column, 2=text
	
	protected void printMsg(int line, int column, String msg) {
		StringBuffer b = new StringBuffer(errMsgFormat);
		int pos = b.indexOf("{0}");
		if (pos >= 0) { b.delete(pos, pos+3); b.insert(pos, line); }
		pos = b.indexOf("{1}");
		if (pos >= 0) { b.delete(pos, pos+3); b.insert(pos, column); }
		pos = b.indexOf("{2}");
		if (pos >= 0) b.replace(pos, pos+3, msg);
		errorStream.println(b.toString());
	}
	
	public void SynErr (int line, int col, int n) {
		String s;
		switch (n) {-->errors
			default: s = "error " + n; break;
		}
		printMsg(line, col, s);
		count++;
	}

	public void SemErr (int line, int col, String s) {	
		printMsg(line, col, s);
		count++;
	}
	
	public void SemErr (String s) {
		errorStream.println(s);
		count++;
	}
	
	public void Warning (int line, int col, String s) {	
		printMsg(line, col, s);
	}
	
	public void Warning (String s) {
		errorStream.println(s);
	}
} // Errors


class FatalError extends RuntimeException {
	public static final long serialVersionUID = 1L;
	public FatalError(String s) { super(s); }
}