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/*-------------------------------------------------------------------------
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); }
}
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