javacc-7.0.3.examples.Interpreter.SPL.jjt Maven / Gradle / Ivy
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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"] >
}