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syntax.y
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syntax.y
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// This is an example of a goyacc program.
// To build it:
// goyacc -p "expr" expr.y (produces y.go)
// go build -o expr y.go
// expr
// > <type an expression>
%{
package main
import (
"github.com/timtadh/lexmachine"
)
%}
%union{
token *lexmachine.Token
ast *Node
}
%token BANG
%token INTEGER_LITERAL
%token BOOLEAN_LITERAL
%token IDENTIFIER
%token CLASS
%token PUBLIC
%token STATIC
%token VOID
%token MAIN
%token STRING
%token SYSTEMOUTPRINTLN
%token RETURN
%token INT
%token IF
%token FOR
%token ELSE
%token WHILE
%token THIS
%token NEW
%token BOOLEAN
%token LENGTH
%token EXTENDS
%token LEFTBRACKET
%token RIGHTBRACKET
%token LEFTANGLEBRACKET
%token RIGHTANGLEBRACKET
%token COMMA
%token SEMICOLON
%token COLON
%token LEFTPARENTHESIS
%token RIGHTPARENTHESIS
%token PERIOD
%token PLUS
%token ASTERIX
%token DIVISION
%token MODULO
%token DOUBLEQUAL
%token DIFFERENT
%token LESS
%token LESSOREQUALS
%token GREATER
%token GREATEROREQUALS
%token LOGICALAND
%token LOGICALOR
%token EQUAL
%token MINUS
%% /* The grammar follows */
Program : MainClass { yylex.(*golex).stmts = append(yylex.(*golex).stmts, $1.ast) }
| MainClass ClassDeclaration
{
yylex.(*golex).stmts=append(yylex.(*golex).stmts,$1.ast)
yylex.(*golex).stmts=append(yylex.(*golex).stmts,$2.ast)
} ;
MainClass : CLASS IDENTIFIER LEFTANGLEBRACKET VarDeclaration PUBLIC STATIC VOID MAIN LEFTPARENTHESIS STRING LEFTBRACKET RIGHTBRACKET IDENTIFIER RIGHTPARENTHESIS LEFTANGLEBRACKET Statement RIGHTANGLEBRACKET RIGHTANGLEBRACKET
{
NewAbstractGlobalVariable($4.ast)
$$.ast=NewNode("MAINCLASS: ",nil).
AddKid(NewNode("class",$1.token)).
AddKid(NewNode("",$2.token)).
AddKid(NewNode("{",$3.token)).
AddKid($4.ast).
AddKid(NewNode("",$5.token)).
AddKid(NewNode("",$6.token)).
AddKid(NewNode("",$7.token)).
AddKid(NewNode("",$8.token)).
AddKid(NewNode("(",$9.token)).
AddKid(NewNode("",$10.token)).
AddKid(NewNode("[",$11.token)).
AddKid(NewNode("]",$12.token)).
AddKid(NewNode("",$13.token)).
AddKid(NewNode(")",$14.token)).
AddKid(NewNode("{",$15.token)).
AddKid($16.ast).
AddKid(NewNode("}",$17.token)).
AddKid(NewNode("}",$18.token)).
AddParent(NewNode("Main Program",nil))
$4.ast.AddParent($$.ast)
}
;
ClassDeclaration : CLASS IDENTIFIER Extension LEFTANGLEBRACKET VarDeclaration MethodDeclaration RIGHTANGLEBRACKET
{
$$.ast= NewNode("<NewClassDeclaration>:", nil).
AddKid(NewNode("",$1.token)).
AddKid(NewNode("",$2.token)).
AddKid($3.ast).
AddKid(NewNode("{",$4.token)).
AddKid($5.ast).
AddKid($6.ast).
AddKid(NewNode("}",$7.token))
$3.ast.AddParent($$.ast)
$5.ast.AddParent($$.ast)
$6.ast.AddParent($$.ast)
$$.ast.AddContext($5.ast)
}
| ClassDeclaration ClassDeclaration
{
$$.ast=NewNode("<ExtraClassDeclarations>:", nil).
AddKid($1.ast).
AddKid($2.ast)
}
;
Extension: EXTENDS IDENTIFIER
{
$$.ast=NewNode("<Extension> ",nil).
AddKid(NewNode("",$1.token)).
AddKid(NewNode("",$2.token))
}
| ;
VarDeclaration : Type IDENTIFIER SEMICOLON VarDeclaration
{
$$.ast=NewNode("<Uninitialized variable definition>:",nil).
AddKid($1.ast).
AddKid(NewNode("",$2.token)).
AddKid(NewNode("",$3.token)).
AddKid($4.ast)
}
| Type IDENTIFIER SEMICOLON
{
$$.ast=NewNode("<Uninitialized variable definition>:",nil).
AddKid($1.ast).
AddKid(NewNode("",$2.token)).
AddKid(NewNode("",$3.token))
}
| Type IDENTIFIER EQUAL Expression SEMICOLON
{
$$.ast=NewNode("<Initialized variable definition>:",nil).
AddKid($1.ast).
AddKid(NewNode("",$2.token)).
AddKid(NewNode("",$3.token)).
AddKid($4.ast).
AddKid(NewNode("",$5.token))
$4.ast.AddParent($$.ast)
}
Statement : LEFTANGLEBRACKET Statement RIGHTANGLEBRACKET
{
$$.ast=NewNode("bracketed statement",nil).
AddKid(NewNode("{",$1.token)).
AddKid($2.ast).
AddKid(NewNode("}",$3.token))
}
| IF LEFTPARENTHESIS Expression RIGHTPARENTHESIS Statement ELSE Statement
{
$$.ast=NewNode("<If block>",nil).
AddKid(NewNode("",$1.token)).
AddKid(NewNode("(",$2.token)).
AddKid($3.ast).
AddKid(NewNode(")",$4.token)).
AddKid($5.ast).
AddKid(NewNode("",$6.token)).
AddKid($7.ast)
$3.ast.AddParent($$.ast)
}
| WHILE LEFTPARENTHESIS Expression RIGHTPARENTHESIS Statement
{
$$.ast=NewNode("<While block>",nil).
AddKid(NewNode("",$1.token)).
AddKid(NewNode("",$2.token)).
AddKid($3.ast).
AddKid(NewNode(")",$4.token)).
AddKid($4.ast)
$3.ast.AddParent($$.ast)
}
| SYSTEMOUTPRINTLN LEFTPARENTHESIS Expression RIGHTPARENTHESIS SEMICOLON
{
$$.ast=NewNode("<Print Statement>",nil).
AddKid(NewNode("",$1.token)).
AddKid(NewNode("",$2.token)).
AddKid($3.ast).
AddKid(NewNode(")",$4.token)).
AddKid(NewNode("",$5.token))
$3.ast.AddParent($$.ast)
QueueElementForChecking($3.ast)
}
| IDENTIFIER EQUAL Expression SEMICOLON
{
$$.ast=NewNode("<Affectation>",nil).
AddKid(NewNode("",$1.token)).
AddKid(NewNode("=",$2.token)).
AddKid($3.ast).
AddKid(NewNode("",$4.token))
$3.ast.AddParent($$.ast)
}
| IDENTIFIER LEFTBRACKET Expression RIGHTBRACKET EQUAL Expression SEMICOLON
{
$$.ast=NewNode("<Array Affectation>",nil).
AddKid(NewNode("",$1.token)).
AddKid(NewNode("[",$2.token)).
AddKid($3.ast).
AddKid(NewNode("]",$4.token)).
AddKid(NewNode("=",$5.token)).
AddKid($6.ast).
AddKid(NewNode("",$7.token))
$3.ast.AddParent($$.ast)
$6.ast.AddParent($$.ast)
}
| Statement Statement
{
$$.ast=NewNode("<BlockOfStatements>:",nil).
AddKid($1.ast).
AddKid($2.ast)
}
| VarDeclaration
{
$$.ast=$1.ast
}
| {$$.ast=NewNode("empty statement content",nil) } ;
Type: INT LEFTBRACKET RIGHTBRACKET { $$.ast=NewNode("int[]",$1.token)}
| BOOLEAN {$$.ast=NewNode("",$1.token)}
| INT {$$.ast=NewNode("",$1.token)}
| IDENTIFIER {$$.ast=NewNode("",$1.token)} ;
MethodTypeDeclaration:
| Type IDENTIFIER
{
$$.ast=NewNode("",nil).
AddKid($1.ast).
AddKid(NewNode("",$2.token))
}
| Type IDENTIFIER COMMA MethodTypeDeclaration
{
$$.ast = NewNode("<Method input type>:",nil).
AddKid($1.ast).
AddKid(NewNode("",$2.token)).
AddKid(NewNode("",$3.token)).
AddKid($4.ast)
}
;
MethodDeclaration : PUBLIC Type IDENTIFIER LEFTPARENTHESIS MethodTypeDeclaration RIGHTPARENTHESIS LEFTANGLEBRACKET VarDeclaration Statement RETURN Expression SEMICOLON RIGHTANGLEBRACKET
{
$$.ast=NewNode("<MethodDeclaration>:",nil).
AddKid(NewNode("",$1.token)).
AddKid($2.ast).
AddKid(NewNode("",$3.token)).
AddKid(NewNode("(",$4.token)).
AddKid($5.ast).
AddKid(NewNode(")",$6.token)).
AddKid(NewNode("{",$7.token)).
AddKid($8.ast).
AddKid($9.ast).
AddKid(NewNode("",$10.token)).
AddKid($11.ast).
AddKid(NewNode(";",$12.token)).
AddKid(NewNode("}",$13.token))
$$.ast.AddContext($8.ast)
$11.ast.AddParent($$.ast)
QueueElementForChecking($$.ast)
}
| MethodDeclaration MethodDeclaration
{
$$.ast=NewNode("<MethodDeclarations>:",nil).
AddKid($1.ast).
AddKid($2.ast)
}
;
Expression : IDENTIFIER
{
$$.ast=NewNode("",$1.token)
}
| Expression LOGICALAND Expression
{
$$.ast=NewNode("&&",$2.token).
AddKid($1.ast).
AddKid($3.ast)
}
| Expression LESS Expression
{
$$.ast=NewNode("<",$2.token).
AddKid($1.ast).
AddKid($3.ast)
}
| Expression PLUS Expression
{
$$.ast=NewNode("+",$2.token).
AddKid($1.ast).
AddKid($3.ast)
}
| Expression MINUS Expression
{
$$.ast=NewNode("+",$2.token).
AddKid($1.ast).
AddKid($3.ast)
}
| Expression ASTERIX Expression
{
$$.ast=NewNode("*",$2.token).
AddKid($1.ast).
AddKid($3.ast)
}
| INTEGER_LITERAL
{
$$.ast=NewNode("",$1.token)
}
| BOOLEAN_LITERAL
{
$$.ast=NewNode("",$1.token)
}
| Expression LEFTBRACKET Expression RIGHTBRACKET
{
$$.ast=NewNode("",nil).
AddKid($1.ast).
AddKid(NewNode("[",$2.token)).
AddKid($3.ast).
AddKid(NewNode("]",$4.token))
}
| Expression PERIOD LENGTH
{
$$.ast=NewNode("<PeriodAccess>:",nil).
AddKid($1.ast).
AddKid(NewNode(".",$2.token)).
AddKid(NewNode("",$3.token))
}
| Expression PERIOD IDENTIFIER LEFTPARENTHESIS MethodExpressionSignature RIGHTPARENTHESIS
{
$$.ast=NewNode("<AccessedFunction>", nil).
AddKid($1.ast).
AddKid(NewNode(".",$2.token)).
AddKid(NewNode("",$3.token)).
AddKid(NewNode("(",$4.token)).
AddKid($5.ast).
AddKid(NewNode(")",$6.token))
}
| THIS
{
$$.ast=NewNode("",$1.token)
}
| NEW INT LEFTBRACKET Expression RIGHTBRACKET
{
$$.ast=NewNode("",nil).
AddKid(NewNode("",$1.token)).
AddKid(NewNode("",$2.token)).
AddKid(NewNode("[",$3.token)).
AddKid($4.ast).
AddKid(NewNode("]",$5.token))
}
| NEW IDENTIFIER LEFTPARENTHESIS RIGHTPARENTHESIS
{
$$.ast=NewNode("<Instantiation>:",nil).
AddKid(NewNode("",$1.token)).
AddKid(NewNode("",$2.token)).
AddKid(NewNode("(",$3.token)).
AddKid(NewNode(")",$4.token))
}
| BANG Expression
{
$$.ast=NewNode("<NOT!>:",nil).
AddKid(NewNode("!",$1.token)).
AddKid($2.ast)
}
| LEFTPARENTHESIS Expression RIGHTPARENTHESIS
{
$$.ast=NewNode("<ParenthesisedExpression>",nil).
AddKid(NewNode("(",$1.token)).
AddKid($2.ast).
AddKid(NewNode(")",$3.token))
}
;
MethodExpressionSignature : Expression
{
$$.ast=$1.ast
}
| MethodExpressionSignature COMMA Expression
{
$$.ast=NewNode("<MultiParametersMethodSignature>",nil).
AddKid($1.ast).
AddKid(NewNode(".",$2.token)).
AddKid($3.ast)
}
;
%%