javacc-7.0.1.examples.Interpreter.SPL.jjt Maven / Gradle / Ivy
Go to download
Show more of this group Show more artifacts with this name
Show all versions of javacc Show documentation
Show all versions of javacc Show documentation
JavaCC is a parser/scanner generator for Java.
/* Copyright (c) 2006, Sun Microsystems, Inc.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* * Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* * Neither the name of the Sun Microsystems, Inc. nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
* THE POSSIBILITY OF SUCH DAMAGE.
*/
options {
MULTI=true;
NODE_EXTENDS="MyNode";
TRACK_TOKENS=true;
}
PARSER_BEGIN(SPLParser)
/** Stupid Programming Language parser. */
public class SPLParser {
/**
* Returns the root node of the AST.
* It only makes sense to call this after a successful parse.
* @return the root node
*/
public Node rootNode() {
return jjtree.rootNode();
}
}
PARSER_END(SPLParser)
SKIP : /* WHITE SPACE */
{
" "
| "\t"
| "\n"
| "\r"
| "\f"
}
TOKEN : /* Types */
{
< INT: "int" >
|
< BOOL: "boolean" >
}
TOKEN : /* LITERALS */
{
< INTEGER_LITERAL: ()+ >
}
/*
* Program structuring syntax follows.
*/
/** Compilation unit. */
void CompilationUnit() :
{
String name;
}
{
(
VarDeclaration() ";"
|
Statement()
)*
}
/** Variable declaration. */
void VarDeclaration() :
{ Token t; }
{
(
"boolean" { jjtThis.type = BOOL; }
|
"int" { jjtThis.type = INT; }
)
t =
{ jjtThis.name = t.image; }
}
/*
* Expression syntax follows.
*/
/** Expression. */
void Expression() #void:
{}
{
LOOKAHEAD( PrimaryExpression() "=" )
Assignment()
|
ConditionalOrExpression()
}
/** Assignment. */
void Assignment() #Assignment(2) :
{}
{
PrimaryExpression() "=" Expression()
}
/** Conditional or expression. */
void ConditionalOrExpression() #void :
{}
{
ConditionalAndExpression()
( "||" ConditionalAndExpression() #OrNode(2) )*
}
/** Conditional and expression. */
void ConditionalAndExpression() #void :
{}
{
InclusiveOrExpression()
( "&&" InclusiveOrExpression() #AndNode(2) )*
}
/** Inclusive or expression. */
void InclusiveOrExpression() #void :
{}
{
ExclusiveOrExpression()
( "|" ExclusiveOrExpression() #BitwiseOrNode(2) )*
}
/** Exclusive or expression. */
void ExclusiveOrExpression() #void :
{}
{
AndExpression()
( "^" AndExpression() #BitwiseXorNode(2) )*
}
/** And expression. */
void AndExpression() #void :
{}
{
EqualityExpression()
( "&" EqualityExpression() #BitwiseAndNode(2) )*
}
/** Equality expression. */
void EqualityExpression() #void :
{}
{
RelationalExpression()
(
"==" RelationalExpression() #EQNode(2)
|
"!=" RelationalExpression() #NENode(2)
)*
}
/** Relational expression. */
void RelationalExpression() #void :
{}
{
AdditiveExpression()
(
"<" AdditiveExpression() #LTNode(2)
|
">" AdditiveExpression() #GTNode(2)
|
"<=" AdditiveExpression() #LENode(2)
|
">=" AdditiveExpression() #GENode(2)
)*
}
/** Additive expression. */
void AdditiveExpression() #void :
{}
{
MultiplicativeExpression()
(
"+" MultiplicativeExpression() #AddNode(2)
|
"-" MultiplicativeExpression() #SubtractNode(2)
)*
}
/** Multiplicative expression. */
void MultiplicativeExpression() #void :
{}
{
UnaryExpression()
(
"*" UnaryExpression() #MulNode(2)
|
"/" UnaryExpression() #DivNode(2)
|
"%" UnaryExpression() #ModNode(2)
)*
}
/** Unary expression. */
void UnaryExpression() #void :
{}
{
"~" UnaryExpression() #BitwiseComplNode(1)
|
"!" UnaryExpression() #NotNode(1)
|
PrimaryExpression()
}
/** Primary expression. */
void PrimaryExpression() #void :
{
String name;
}
{
Literal()
|
Id()
|
"(" Expression() ")"
}
/** An Id. */
void Id() :
{
Token t;
}
{
t = { jjtThis.name = t.image; }
}
/** A literal. */
void Literal() #void :
{
Token t;
}
{
(
t=
{
jjtThis.val = Integer.parseInt(t.image);
}
)#IntConstNode
|
BooleanLiteral()
}
/** A boolean literal. */
void BooleanLiteral() #void :
{}
{
"true" #TrueNode
|
"false" #FalseNode
}
/*
* Statement syntax follows.
*/
/** A statement. */
void Statement() #void :
{}
{
";"
|
LOOKAHEAD(2)
LabeledStatement()
|
Block()
|
StatementExpression()
|
IfStatement()
|
WhileStatement()
|
IOStatement()
}
/** A labeled statement. */
void LabeledStatement() #void :
{}
{
":" Statement()
}
/** A block. */
void Block() :
{}
{
"{" ( Statement() )* "}"
}
/** A statement expression. */
void StatementExpression() :
/*
* The last expansion of this production accepts more than the legal
* SPL expansions for StatementExpression.
*/
{}
{
Assignment() ";"
}
/** An if statement. */
void IfStatement() :
/*
* The disambiguating algorithm of JavaCC automatically binds dangling
* else's to the innermost if statement. The LOOKAHEAD specification
* is to tell JavaCC that we know what we are doing.
*/
{}
{
"if" "(" Expression() ")" Statement() [ LOOKAHEAD(1) "else" Statement() ]
}
/** A while statement. */
void WhileStatement() :
{}
{
"while" "(" Expression() ")" Statement()
}
/** An IO statement. */
void IOStatement() #void :
{ String name; }
{
ReadStatement()
|
WriteStatement()
}
/** A read statement. */
void ReadStatement() :
{ Token t; }
{
"read" t =
{ jjtThis.name = t.image; }
}
/** A write statement. */
void WriteStatement() :
{ Token t; }
{
"write" t =
{ jjtThis.name = t.image; }
}
TOKEN : /* IDENTIFIERS */
{
< IDENTIFIER: (|)* >
|
< #LETTER: [ "a"-"z", "A"-"Z" ] >
|
< #DIGIT: [ "0"-"9"] >
}