/
relaxExpressions-read3.xbgf
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relaxExpressions-read3.xbgf
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<?xml version="1.0" encoding="utf-8"?>
<xbgf:sequence
xmlns:bgf="http://planet-sl.org/bgf"
xmlns:xbgf="http://planet-sl.org/xbgf">
<!--
Expressions in the syntax appendix look like this:
Expression is defined as:
Expression1 [ AssignmentOperator Expression1 ]
Expression1 is defined as:
Expression2 [ Expression1Rest ]
Expression1Rest is defined as:
[ "?" Expression ":" Expression1 ]
Expression2 is defined as:
Expression3 [ Expression2Rest ]
Expression2Rest is defined as:
{ InfixOp Expression3 }
Expression3 "instanceof" Type
Expression3 is defined as:
PrefixOp Expression3
"(" Expression | Type ")" Expression3
Primary { Selector } { PostfixOp }
While in the text of the spec it is layered like this:
Expression is defined as:
AssignmentExpression
AssignmentExpression is defined as:
ConditionalExpression
Assignment
ConditionalExpression is defined as:
ConditionalOrExpression
ConditionalOrExpression "?" Expression ":" ConditionalExpression
Assignment is defined as:
LeftHandSide AssignmentOperator AssignmentExpression
LeftHandSide is defined as:
ExpressionName
FieldAccess
ArrayAccess
FieldAccess is defined as:
Primary "." Identifier
"super" "." Identifier
ClassName "." "super" "." Identifier
ArrayAccess is defined as:
ExpressionName "[" Expression "]"
PrimaryNoNewArray "[" Expression "]"
ConditionalOrExpression is defined as:
ConditionalAndExpression
ConditionalOrExpression "||" ConditionalAndExpression
ConditionalAndExpression is defined as:
InclusiveOrExpression
ConditionalAndExpression "&&" InclusiveOrExpression
InclusiveOrExpression is defined as:
ExclusiveOrExpression
InclusiveOrExpression "|" ExclusiveOrExpression
ExclusiveOrExpression is defined as:
AndExpression
ExclusiveOrExpression "^" AndExpression
AndExpression is defined as:
EqualityExpression
AndExpression "&" EqualityExpression
EqualityExpression is defined as:
RelationalExpression
EqualityExpression "==" RelationalExpression
EqualityExpression "!=" RelationalExpression
RelationalExpression is defined as:
ShiftExpression
RelationalExpression "<" ShiftExpression
RelationalExpression ">" ShiftExpression
RelationalExpression "<=" ShiftExpression
RelationalExpression ">=" ShiftExpression
RelationalExpression "instanceof" ReferenceType
ShiftExpression is defined as:
AdditiveExpression
ShiftExpression "<<" AdditiveExpression
ShiftExpression ">>" AdditiveExpression
ShiftExpression ">>>" AdditiveExpression
AdditiveExpression is defined as:
MultiplicativeExpression
AdditiveExpression "+" MultiplicativeExpression
AdditiveExpression "-" MultiplicativeExpression
MultiplicativeExpression is defined as:
UnaryExpression
MultiplicativeExpression "*" UnaryExpression
MultiplicativeExpression "/" UnaryExpression
MultiplicativeExpression "%" UnaryExpression
UnaryExpression is defined as:
PreIncrementExpression
PreDecrementExpression
"+" UnaryExpression
"-" UnaryExpression
UnaryExpressionNotPlusMinus
PreIncrementExpression is defined as:
"++" UnaryExpression
PreDecrementExpression is defined as:
"- -" UnaryExpression
UnaryExpressionNotPlusMinus is defined as:
PostfixExpression
"~" UnaryExpression
"!" UnaryExpression
CastExpression
PostfixExpression is defined as:
Primary
ExpressionName
PostIncrementExpression
PostDecrementExpression
PostIncrementExpression is defined as:
PostfixExpression "++"
PostDecrementExpression is defined as:
PostfixExpression "- -"
CastExpression is defined as:
"(" PrimitiveType [ Dims ] ")" UnaryExpression
"(" ReferenceType ")" UnaryExpressionNotPlusMinus
-->
<!-- ISSUE PERMISSIVENESS
Everything that can be united to make Expression2 -->
<xbgf:atomic>
<!-- RELAXATION -->
<xbgf:unite>
<add>ConditionalAndExpression</add>
<to>Expression2</to>
</xbgf:unite>
<!-- RELAXATION -->
<xbgf:unite>
<add>InclusiveOrExpression</add>
<to>Expression2</to>
</xbgf:unite>
<!-- RELAXATION -->
<xbgf:unite>
<add>ExclusiveOrExpression</add>
<to>Expression2</to>
</xbgf:unite>
<!-- RELAXATION -->
<xbgf:unite>
<add>AndExpression</add>
<to>Expression2</to>
</xbgf:unite>
<!-- RELAXATION -->
<xbgf:unite>
<add>EqualityExpression</add>
<to>Expression2</to>
</xbgf:unite>
<!-- RELAXATION -->
<xbgf:unite>
<add>RelationalExpression</add>
<to>Expression2</to>
</xbgf:unite>
<!-- RELAXATION -->
<xbgf:unite>
<add>ShiftExpression</add>
<to>Expression2</to>
</xbgf:unite>
<!-- RELAXATION -->
<xbgf:unite>
<add>AdditiveExpression</add>
<to>Expression2</to>
</xbgf:unite>
<!-- RELAXATION -->
<xbgf:unite>
<add>MultiplicativeExpression</add>
<to>Expression2</to>
</xbgf:unite>
<xbgf:horizontal>Expression2</xbgf:horizontal>
</xbgf:atomic>
<!-- Introducing another layering scheme: Expression3 -->
<!-- GENERALITY -->
<!-- RELAXATION -->
<xbgf:replace>
<bgf:expression>
<nonterminal>Expression2</nonterminal>
</bgf:expression>
<bgf:expression>
<nonterminal>Expression3</nonterminal>
</bgf:expression>
<in>
<nonterminal>Expression2</nonterminal>
</in>
</xbgf:replace>
<xbgf:horizontal>Expression3</xbgf:horizontal>
<!-- Huge factoring for fishing out infix operators -->
<xbgf:factor>
<bgf:expression>
<choice>
<bgf:expression>
<sequence>
<bgf:expression>
<nonterminal>Expression3</nonterminal>
</bgf:expression>
<bgf:expression>
<terminal>&</terminal>
</bgf:expression>
<bgf:expression>
<nonterminal>Expression3</nonterminal>
</bgf:expression>
</sequence>
</bgf:expression>
<bgf:expression>
<sequence>
<bgf:expression>
<nonterminal>Expression3</nonterminal>
</bgf:expression>
<bgf:expression>
<terminal>&&</terminal>
</bgf:expression>
<bgf:expression>
<nonterminal>Expression3</nonterminal>
</bgf:expression>
</sequence>
</bgf:expression>
<bgf:expression>
<sequence>
<bgf:expression>
<nonterminal>Expression3</nonterminal>
</bgf:expression>
<bgf:expression>
<terminal>||</terminal>
</bgf:expression>
<bgf:expression>
<nonterminal>Expression3</nonterminal>
</bgf:expression>
</sequence>
</bgf:expression>
<bgf:expression>
<sequence>
<bgf:expression>
<nonterminal>Expression3</nonterminal>
</bgf:expression>
<bgf:expression>
<terminal>|</terminal>
</bgf:expression>
<bgf:expression>
<nonterminal>Expression3</nonterminal>
</bgf:expression>
</sequence>
</bgf:expression>
<bgf:expression>
<sequence>
<bgf:expression>
<nonterminal>Expression3</nonterminal>
</bgf:expression>
<bgf:expression>
<terminal>^</terminal>
</bgf:expression>
<bgf:expression>
<nonterminal>Expression3</nonterminal>
</bgf:expression>
</sequence>
</bgf:expression>
<bgf:expression>
<sequence>
<bgf:expression>
<nonterminal>Expression3</nonterminal>
</bgf:expression>
<bgf:expression>
<terminal>==</terminal>
</bgf:expression>
<bgf:expression>
<nonterminal>Expression3</nonterminal>
</bgf:expression>
</sequence>
</bgf:expression>
<bgf:expression>
<sequence>
<bgf:expression>
<nonterminal>Expression3</nonterminal>
</bgf:expression>
<bgf:expression>
<terminal>!=</terminal>
</bgf:expression>
<bgf:expression>
<nonterminal>Expression3</nonterminal>
</bgf:expression>
</sequence>
</bgf:expression>
<bgf:expression>
<sequence>
<bgf:expression>
<nonterminal>Expression3</nonterminal>
</bgf:expression>
<bgf:expression>
<terminal><</terminal>
</bgf:expression>
<bgf:expression>
<nonterminal>Expression3</nonterminal>
</bgf:expression>
</sequence>
</bgf:expression>
<bgf:expression>
<sequence>
<bgf:expression>
<nonterminal>Expression3</nonterminal>
</bgf:expression>
<bgf:expression>
<terminal>></terminal>
</bgf:expression>
<bgf:expression>
<nonterminal>Expression3</nonterminal>
</bgf:expression>
</sequence>
</bgf:expression>
<bgf:expression>
<sequence>
<bgf:expression>
<nonterminal>Expression3</nonterminal>
</bgf:expression>
<bgf:expression>
<terminal><=</terminal>
</bgf:expression>
<bgf:expression>
<nonterminal>Expression3</nonterminal>
</bgf:expression>
</sequence>
</bgf:expression>
<bgf:expression>
<sequence>
<bgf:expression>
<nonterminal>Expression3</nonterminal>
</bgf:expression>
<bgf:expression>
<terminal>>=</terminal>
</bgf:expression>
<bgf:expression>
<nonterminal>Expression3</nonterminal>
</bgf:expression>
</sequence>
</bgf:expression>
<bgf:expression>
<sequence>
<bgf:expression>
<nonterminal>Expression3</nonterminal>
</bgf:expression>
<bgf:expression>
<terminal><<</terminal>
</bgf:expression>
<bgf:expression>
<nonterminal>Expression3</nonterminal>
</bgf:expression>
</sequence>
</bgf:expression>
<bgf:expression>
<sequence>
<bgf:expression>
<nonterminal>Expression3</nonterminal>
</bgf:expression>
<bgf:expression>
<terminal>>></terminal>
</bgf:expression>
<bgf:expression>
<nonterminal>Expression3</nonterminal>
</bgf:expression>
</sequence>
</bgf:expression>
<bgf:expression>
<sequence>
<bgf:expression>
<nonterminal>Expression3</nonterminal>
</bgf:expression>
<bgf:expression>
<terminal>>>></terminal>
</bgf:expression>
<bgf:expression>
<nonterminal>Expression3</nonterminal>
</bgf:expression>
</sequence>
</bgf:expression>
<bgf:expression>
<sequence>
<bgf:expression>
<nonterminal>Expression3</nonterminal>
</bgf:expression>
<bgf:expression>
<terminal>+</terminal>
</bgf:expression>
<bgf:expression>
<nonterminal>Expression3</nonterminal>
</bgf:expression>
</sequence>
</bgf:expression>
<bgf:expression>
<sequence>
<bgf:expression>
<nonterminal>Expression3</nonterminal>
</bgf:expression>
<bgf:expression>
<terminal>-</terminal>
</bgf:expression>
<bgf:expression>
<nonterminal>Expression3</nonterminal>
</bgf:expression>
</sequence>
</bgf:expression>
<bgf:expression>
<sequence>
<bgf:expression>
<nonterminal>Expression3</nonterminal>
</bgf:expression>
<bgf:expression>
<terminal>*</terminal>
</bgf:expression>
<bgf:expression>
<nonterminal>Expression3</nonterminal>
</bgf:expression>
</sequence>
</bgf:expression>
<bgf:expression>
<sequence>
<bgf:expression>
<nonterminal>Expression3</nonterminal>
</bgf:expression>
<bgf:expression>
<terminal>/</terminal>
</bgf:expression>
<bgf:expression>
<nonterminal>Expression3</nonterminal>
</bgf:expression>
</sequence>
</bgf:expression>
<bgf:expression>
<sequence>
<bgf:expression>
<nonterminal>Expression3</nonterminal>
</bgf:expression>
<bgf:expression>
<terminal>%</terminal>
</bgf:expression>
<bgf:expression>
<nonterminal>Expression3</nonterminal>
</bgf:expression>
</sequence>
</bgf:expression>
</choice>
</bgf:expression>
<bgf:expression>
<sequence>
<bgf:expression>
<nonterminal>Expression3</nonterminal>
</bgf:expression>
<bgf:expression>
<choice>
<bgf:expression>
<terminal>&</terminal>
</bgf:expression>
<bgf:expression>
<terminal>&&</terminal>
</bgf:expression>
<bgf:expression>
<terminal>||</terminal>
</bgf:expression>
<bgf:expression>
<terminal>|</terminal>
</bgf:expression>
<bgf:expression>
<terminal>^</terminal>
</bgf:expression>
<bgf:expression>
<terminal>==</terminal>
</bgf:expression>
<bgf:expression>
<terminal>!=</terminal>
</bgf:expression>
<bgf:expression>
<terminal><</terminal>
</bgf:expression>
<bgf:expression>
<terminal>></terminal>
</bgf:expression>
<bgf:expression>
<terminal><=</terminal>
</bgf:expression>
<bgf:expression>
<terminal>>=</terminal>
</bgf:expression>
<bgf:expression>
<terminal><<</terminal>
</bgf:expression>
<bgf:expression>
<terminal>>></terminal>
</bgf:expression>
<bgf:expression>
<terminal>>>></terminal>
</bgf:expression>
<bgf:expression>
<terminal>+</terminal>
</bgf:expression>
<bgf:expression>
<terminal>-</terminal>
</bgf:expression>
<bgf:expression>
<terminal>*</terminal>
</bgf:expression>
<bgf:expression>
<terminal>/</terminal>
</bgf:expression>
<bgf:expression>
<terminal>%</terminal>
</bgf:expression>
</choice>
</bgf:expression>
<bgf:expression>
<nonterminal>Expression3</nonterminal>
</bgf:expression>
</sequence>
</bgf:expression>
</xbgf:factor>
<xbgf:atomic>
<xbgf:extract>
<bgf:production>
<nonterminal>InfixOp</nonterminal>
<bgf:expression>
<choice>
<bgf:expression>
<terminal>&</terminal>
</bgf:expression>
<bgf:expression>
<terminal>&&</terminal>
</bgf:expression>
<bgf:expression>
<terminal>||</terminal>
</bgf:expression>
<bgf:expression>
<terminal>|</terminal>
</bgf:expression>
<bgf:expression>
<terminal>^</terminal>
</bgf:expression>
<bgf:expression>
<terminal>==</terminal>
</bgf:expression>
<bgf:expression>
<terminal>!=</terminal>
</bgf:expression>
<bgf:expression>
<terminal><</terminal>
</bgf:expression>
<bgf:expression>
<terminal>></terminal>
</bgf:expression>
<bgf:expression>
<terminal><=</terminal>
</bgf:expression>
<bgf:expression>
<terminal>>=</terminal>
</bgf:expression>
<bgf:expression>
<terminal><<</terminal>
</bgf:expression>
<bgf:expression>
<terminal>>></terminal>
</bgf:expression>
<bgf:expression>
<terminal>>>></terminal>
</bgf:expression>
<bgf:expression>
<terminal>+</terminal>
</bgf:expression>
<bgf:expression>
<terminal>-</terminal>
</bgf:expression>
<bgf:expression>
<terminal>*</terminal>
</bgf:expression>
<bgf:expression>
<terminal>/</terminal>
</bgf:expression>
<bgf:expression>
<terminal>%</terminal>
</bgf:expression>
</choice>
</bgf:expression>
</bgf:production>
</xbgf:extract>
<xbgf:vertical>
<nonterminal>InfixOp</nonterminal>
</xbgf:vertical>
</xbgf:atomic>
<!-- revert of l-assoc-->
<!-- RELAXATION -->
<xbgf:widen>
<bgf:expression>
<sequence>
<bgf:expression>
<nonterminal>InfixOp</nonterminal>
</bgf:expression>
<bgf:expression>
<nonterminal>Expression3</nonterminal>
</bgf:expression>
</sequence>
</bgf:expression>
<bgf:expression>
<star>
<bgf:expression>
<sequence>
<bgf:expression>
<nonterminal>InfixOp</nonterminal>
</bgf:expression>
<bgf:expression>
<nonterminal>Expression3</nonterminal>
</bgf:expression>
</sequence>
</bgf:expression>
</star>
</bgf:expression>
<in>
<nonterminal>Expression2</nonterminal>
</in>
</xbgf:widen>
<!-- extracting Expression2Rest -->
<xbgf:factor>
<bgf:expression>
<choice>
<bgf:expression>
<sequence>
<bgf:expression>
<nonterminal>Expression3</nonterminal>
</bgf:expression>
<bgf:expression>
<terminal>instanceof</terminal>
</bgf:expression>
<bgf:expression>
<nonterminal>Type</nonterminal>
</bgf:expression>
</sequence>
</bgf:expression>
<bgf:expression>
<sequence>
<bgf:expression>
<nonterminal>Expression3</nonterminal>
</bgf:expression>
<bgf:expression>
<star>
<bgf:expression>
<sequence>
<bgf:expression>
<nonterminal>InfixOp</nonterminal>
</bgf:expression>
<bgf:expression>
<nonterminal>Expression3</nonterminal>
</bgf:expression>
</sequence>
</bgf:expression>
</star>
</bgf:expression>
</sequence>
</bgf:expression>
</choice>
</bgf:expression>
<bgf:expression>
<sequence>
<bgf:expression>
<nonterminal>Expression3</nonterminal>
</bgf:expression>
<bgf:expression>
<choice>
<bgf:expression>
<sequence>
<bgf:expression>
<terminal>instanceof</terminal>
</bgf:expression>
<bgf:expression>
<nonterminal>Type</nonterminal>
</bgf:expression>
</sequence>
</bgf:expression>
<bgf:expression>
<star>
<bgf:expression>
<sequence>
<bgf:expression>
<nonterminal>InfixOp</nonterminal>
</bgf:expression>
<bgf:expression>
<nonterminal>Expression3</nonterminal>
</bgf:expression>
</sequence>
</bgf:expression>
</star>
</bgf:expression>
</choice>
</bgf:expression>
</sequence>
</bgf:expression>
</xbgf:factor>
<xbgf:atomic>
<xbgf:extract>
<bgf:production>
<nonterminal>Expression2Rest</nonterminal>
<bgf:expression>
<choice>
<bgf:expression>
<sequence>
<bgf:expression>
<terminal>instanceof</terminal>
</bgf:expression>
<bgf:expression>
<nonterminal>Type</nonterminal>
</bgf:expression>
</sequence>
</bgf:expression>
<bgf:expression>
<star>
<bgf:expression>
<sequence>
<bgf:expression>
<nonterminal>InfixOp</nonterminal>
</bgf:expression>
<bgf:expression>
<nonterminal>Expression3</nonterminal>
</bgf:expression>
</sequence>
</bgf:expression>
</star>
</bgf:expression>
</choice>
</bgf:expression>
</bgf:production>
</xbgf:extract>
<xbgf:vertical>
<nonterminal>Expression2Rest</nonterminal>
</xbgf:vertical>
</xbgf:atomic>
<xbgf:factor>
<bgf:expression>
<choice>
<bgf:expression>
<nonterminal>Expression3</nonterminal>
</bgf:expression>
<bgf:expression>
<sequence>
<bgf:expression>
<nonterminal>Expression3</nonterminal>
</bgf:expression>
<bgf:expression>
<nonterminal>Expression2Rest</nonterminal>
</bgf:expression>
</sequence>
</bgf:expression>
</choice>
</bgf:expression>
<bgf:expression>
<sequence>
<bgf:expression>
<nonterminal>Expression3</nonterminal>
</bgf:expression>
<bgf:expression>
<choice>
<bgf:expression>
<epsilon/>
</bgf:expression>
<bgf:expression>
<nonterminal>Expression2Rest</nonterminal>
</bgf:expression>
</choice>
</bgf:expression>
</sequence>
</bgf:expression>
</xbgf:factor>
<xbgf:massage>
<bgf:expression>
<choice>
<bgf:expression>
<epsilon/>
</bgf:expression>
<bgf:expression>
<nonterminal>Expression2Rest</nonterminal>
</bgf:expression>
</choice>
</bgf:expression>
<bgf:expression>
<optional>
<bgf:expression>
<nonterminal>Expression2Rest</nonterminal>
</bgf:expression>
</optional>
</bgf:expression>
</xbgf:massage>
<!--
- Fail: Expression.
- [], n(AssignmentExpression)
vs.
- [], ,([n(Expression1), ?(,([n(AssignmentOperator), n(Expression1)]))])
-->
<xbgf:horizontal>AssignmentExpression</xbgf:horizontal>
<xbgf:unfold>
<nonterminal>AssignmentExpression</nonterminal>
<in>
<nonterminal>Expression</nonterminal>
</in>
</xbgf:unfold>
<!--
- Fail: Expression1.
- [], ;([n(Expression2), ,([n(Expression2), t(?), n(Expression), t(:), n(Expression1)])])
vs.
- [], ,([n(Expression2), ?(n(Expression1Rest))])
-->
<xbgf:horizontal>Expression1</xbgf:horizontal>
<xbgf:factor>
<bgf:expression>
<choice>
<bgf:expression>
<nonterminal>Expression2</nonterminal>
</bgf:expression>
<bgf:expression>
<sequence>
<bgf:expression>
<nonterminal>Expression2</nonterminal>
</bgf:expression>
<bgf:expression>
<terminal>?</terminal>
</bgf:expression>
<bgf:expression>
<nonterminal>Expression</nonterminal>
</bgf:expression>
<bgf:expression>
<terminal>:</terminal>
</bgf:expression>
<bgf:expression>
<nonterminal>Expression1</nonterminal>
</bgf:expression>
</sequence>
</bgf:expression>
</choice>
</bgf:expression>
<bgf:expression>
<sequence>
<bgf:expression>
<nonterminal>Expression2</nonterminal>
</bgf:expression>
<bgf:expression>
<choice>
<bgf:expression>
<epsilon/>
</bgf:expression>
<bgf:expression>
<sequence>
<bgf:expression>
<terminal>?</terminal>
</bgf:expression>
<bgf:expression>
<nonterminal>Expression</nonterminal>
</bgf:expression>
<bgf:expression>
<terminal>:</terminal>
</bgf:expression>
<bgf:expression>
<nonterminal>Expression1</nonterminal>
</bgf:expression>
</sequence>
</bgf:expression>
</choice>
</bgf:expression>
</sequence>
</bgf:expression>
</xbgf:factor>
<xbgf:massage>
<bgf:expression>
<choice>
<bgf:expression>
<epsilon/>
</bgf:expression>
<bgf:expression>
<sequence>
<bgf:expression>
<terminal>?</terminal>
</bgf:expression>
<bgf:expression>
<nonterminal>Expression</nonterminal>
</bgf:expression>
<bgf:expression>
<terminal>:</terminal>
</bgf:expression>
<bgf:expression>
<nonterminal>Expression1</nonterminal>
</bgf:expression>
</sequence>
</bgf:expression>
</choice>
</bgf:expression>
<bgf:expression>
<optional>
<bgf:expression>
<sequence>
<bgf:expression>
<terminal>?</terminal>
</bgf:expression>
<bgf:expression>
<nonterminal>Expression</nonterminal>
</bgf:expression>
<bgf:expression>
<terminal>:</terminal>
</bgf:expression>
<bgf:expression>
<nonterminal>Expression1</nonterminal>
</bgf:expression>
</sequence>
</bgf:expression>
</optional>
</bgf:expression>
</xbgf:massage>
<xbgf:extract>
<bgf:production>
<nonterminal>Expression1Rest</nonterminal>
<bgf:expression>
<sequence>
<bgf:expression>
<terminal>?</terminal>
</bgf:expression>
<bgf:expression>
<nonterminal>Expression</nonterminal>
</bgf:expression>
<bgf:expression>
<terminal>:</terminal>
</bgf:expression>
<bgf:expression>
<nonterminal>Expression1</nonterminal>
</bgf:expression>
</sequence>
</bgf:expression>
</bgf:production>
</xbgf:extract>
<!-- Prefixes -->
<xbgf:inline>PreIncrementExpression</xbgf:inline>
<xbgf:inline>PreDecrementExpression</xbgf:inline>
<xbgf:horizontal>UnaryExpressionNotPlusMinus</xbgf:horizontal>
<xbgf:inline>UnaryExpressionNotPlusMinus</xbgf:inline>
<!--
<xbgf:distribute>
<nonterminal>Expression3</nonterminal>
</xbgf:distribute>
-->
<xbgf:factor>
<bgf:expression>
<choice>
<bgf:expression>
<sequence>
<bgf:expression>
<terminal>++</terminal>
</bgf:expression>
<bgf:expression>
<nonterminal>Expression3</nonterminal>
</bgf:expression>
</sequence>
</bgf:expression>
<bgf:expression>
<sequence>
<bgf:expression>
<terminal>--</terminal>
</bgf:expression>
<bgf:expression>
<nonterminal>Expression3</nonterminal>
</bgf:expression>
</sequence>
</bgf:expression>
<bgf:expression>
<sequence>
<bgf:expression>
<terminal>+</terminal>
</bgf:expression>
<bgf:expression>
<nonterminal>Expression3</nonterminal>
</bgf:expression>
</sequence>
</bgf:expression>
<bgf:expression>
<sequence>
<bgf:expression>
<terminal>-</terminal>
</bgf:expression>
<bgf:expression>
<nonterminal>Expression3</nonterminal>
</bgf:expression>
</sequence>
</bgf:expression>
<bgf:expression>
<sequence>
<bgf:expression>
<terminal>~</terminal>
</bgf:expression>
<bgf:expression>
<nonterminal>Expression3</nonterminal>
</bgf:expression>
</sequence>
</bgf:expression>
<bgf:expression>
<sequence>
<bgf:expression>
<terminal>!</terminal>
</bgf:expression>
<bgf:expression>
<nonterminal>Expression3</nonterminal>
</bgf:expression>