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|
%Options gp=java,act,tab,an=expract.java,hn=exprhdr.java,tab=space,fp=expr,prefix=TK_,
%Options nogoto-default,output-size=125,name=max,error-maps
%Define
-- This software is subject to the terms of the IBM Jikes Parser
-- Generator License Agreement available at the following URL:
-- http://www.ibm.com/research/jikes.
-- Copyright (C) 1983, 1999, International Business Machines Corporation
-- and others. All Rights Reserved.
-- You must accept the terms of that agreement to use this software.
-- This grammar has been augmented with productions that captures
-- most errors that a user is likely to make. This saves the need
-- to have an error recovery system.
--
-- This macro is used to initialize the rule_action array
-- to the null_action function.
--
%null_action
/.
new NullAction(),
./
--
-- This macro is used to initialize the rule_action array
-- to the no_action function.
--
%no_action
/.
new NoAction(),
./
%Terminals
PLUS MINUS STAR SLASH NUMBER LPAREN RPAREN
EOF ERROR
%Alias
'+' ::= PLUS
'-' ::= MINUS
'*' ::= STAR
'/' ::= SLASH
'(' ::= LPAREN
')' ::= RPAREN
%EOF ::= EOF
%ERROR ::= ERROR
%Rules
/:
class exprhdr extends expract
{
Action rule_action[] = {
null, // no element 0
:/
/.
class expract
{
Parser parser;
expract(Parser parser)
{
this.parser = parser;
}
interface Action
{
public void action();
}
final class NoAction implements Action
{
public void action() {}
}
final class NullAction implements Action
{
public void action() { parser.setSYM1(null); }
}
./
Goal ::= %empty
/:%null_action:/
Goal ::= Expression
/:%no_action:/
Expression ::= Expression '+' Term
/: new act%rule_number(),:/
/.
//
// Rule %rule_number: %rule_text
//
final class act%rule_number implements Action
{
public void action()
{
AstPlus node = new AstPlus();
node.left = parser.SYM(1);
node.op = parser.TOKEN(2);
node.right = parser.SYM(3);
parser.setSYM1(node);
return;
}
}
./
Expression ::= Expression '-' Term
/: new act%rule_number(),:/
/.
//
// Rule %rule_number: %rule_text
//
final class act%rule_number implements Action
{
public void action()
{
AstMinus node = new AstMinus();
node.left = parser.SYM(1);
node.op = parser.TOKEN(2);
node.right = parser.SYM(3);
parser.setSYM1(node);
}
}
./
Expression ::= Term
/:%no_action:/
Term ::= Term '*' Factor
/: new act%rule_number(),:/
/.
//
// Rule %rule_number: %rule_text
//
final class act%rule_number implements Action
{
public void action()
{
AstStar node = new AstStar();
node.left = parser.SYM(1);
node.op = parser.TOKEN(2);
node.right = parser.SYM(3);
parser.setSYM1(node);
}
}
./
Term ::= Term '/' Factor
/: new act%rule_number(),:/
/.
//
// Rule %rule_number: %rule_text
//
final class act%rule_number implements Action
{
public void action()
{
AstSlash node = new AstSlash();
node.left = parser.SYM(1);
node.op = parser.TOKEN(2);
node.right = parser.SYM(3);
parser.setSYM1(node);
}
}
./
Term ::= Factor
/:%no_action:/
Factor ::= NUMBER
/: new act%rule_number(),:/
/.
//
// Rule %rule_number: %rule_text
//
final class act%rule_number implements Action
{
public void action()
{
AstNumber node = new AstNumber();
node.token = parser.TOKEN(1);
node.value = Integer.parseInt(parser.lex_stream.Name(node.token));
parser.setSYM1(node);
}
}
./
Factor ::= '-' NUMBER
/: new act%rule_number(),:/
/.
//
// Rule %rule_number: %rule_text
//
final class act%rule_number implements Action
{
public void action()
{
AstNegativeNumber node = new AstNegativeNumber();
node.op = parser.TOKEN(1);
node.token = parser.TOKEN(2);
node.value = - Integer.parseInt(parser.lex_stream.Name(node.token));
parser.setSYM1(node);
}
}
./
Factor ::= '(' Expression ')'
/: new act%rule_number(),:/
/.
//
// Rule %rule_number: %rule_text
//
final class act%rule_number implements Action
{
public void action()
{
AstParen node = new AstParen();
node.expression = parser.SYM(2);
parser.setSYM1(node);
}
}
./
/:
};
exprhdr(Parser parser)
{
super(parser);
}
}
:/
/.
}
./
%End
|
