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SnowStarParserExperimental.g4
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parser grammar SnowStarParser;
options {
tokenVocab = SnowStarLexer;
}
/** Entry point/Basic concepts */
compilationUnit
: declarationSeq? EOF
;
/** Expressions */
primaryExpression
: literal
| LPAREN expression RPAREN
| idExpression
;
idExpression
: IDENTIFIER
;
expressionList
: initializerList
;
unaryExpression
: unaryOperator expression
;
unaryOperator
: '|'
| '+'
| '!'
| '~'
| '-'
;
castExpression
: unaryExpression
| LPAREN thetypeid RPAREN castExpression
;
multiplicativeExpression
: castExpression
| multiplicativeExpression STAR castExpression
| multiplicativeExpression SLASH castExpression
;
additiveExpression
: multiplicativeExpression
| additiveExpression PLUS multiplicativeExpression
| additiveExpression MINUS multiplicativeExpression
;
relationalExpression
: additiveExpression
| relationalExpression LOWER additiveExpression
| relationalExpression GREATER additiveExpression
| relationalExpression LOWER_EQ additiveExpression
| relationalExpression GREATER_EQ additiveExpression
;
equalityExpression
: relationalExpression
| equalityExpression EQUALS relationalExpression
| equalityExpression NEQUALS relationalExpression
;
andExpression
: equalityExpression
| andExpression BIN_AND equalityExpression
;
exclusiveOrExpression
: andExpression
| exclusiveOrExpression BIN_XOR andExpression
;
inclusiveOrExpression
: exclusiveOrExpression
| inclusiveOrExpression BIN_OR exclusiveOrExpression
;
logicalAndExpression
: inclusiveOrExpression
| logicalAndExpression LOGIC_AND exclusiveOrExpression
;
logicalOrExpression
: logicalAndExpression
| logicalOrExpression LOGIC_OR logicalAndExpression
;
assignementExpression
: logicalOrExpression
| logicalOrExpression assignementOperator initializerClause
;
assignementOperator
: ASSIGN
;
expression
: assignementExpression
| expression COMMA assignementExpression
;
/** Statements */
statement
: attributeSpecifierSeq? expressionStatement
| attributeSpecifierSeq? compoundStatement
| declarationStatement
;
expressionStatement
: expression? SEMI
;
compoundStatement
: LBRACE statementSeq? RBRACE
;
statementSeq
: statement
| statementSeq statement
;
declarationStatement
: blockDeclaration
;
/** Declarations */
declarationSeq
: declaration
| declarationSeq declaration
;
declaration
: blockDeclaration
| functionDefinition
| namespaceDefinition
| emptyDeclaration
| attributeDeclaration
;
blockDeclaration
: simpleDeclaration
| aliasDeclaration
;
aliasDeclaration
: WITH IDENTIFIER attributeSpecifierSeq? ASSIGN thetypeid SEMI
;
simpleDeclaration
: declSpecifierSeq? initDeclaratorList? SEMI
| attributeSpecifierSeq declSpecifierSeq? initDeclaratorList SEMI
;
emptyDeclaration
: SEMI
;
attributeDeclaration
: attributeSpecifierSeq SEMI
;
declSpecifier
: typeSpecifier
| functionSpecifier
;
declSpecifierSeq
: declSpecifier attributeSpecifierSeq?
| declSpecifier declSpecifierSeq
;
functionSpecifier
: EXTERNAL
;
typeSpecifier
: trailingTypeSpecifier
;
trailingTypeSpecifier
: simpleTypeSpecifier
;
typeSpecifierSeq: typeSpecifier attributeSpecifierSeq?
| typeSpecifier typeSpecifierSeq
;
trailingTypeSpecifierSeq: trailingTypeSpecifier attributeSpecifierSeq?
| trailingTypeSpecifier trailingTypeSpecifierSeq
;
simpleTypeSpecifier
: CHAR
| BOOL
| INT8
| INT16
| INT32
| INT64
| REAL16
| REAL32
| REAL64
| VOID
;
namespaceName
: originalNamespaceName
| namespaceAlias
;
originalNamespaceName
: IDENTIFIER
;
namespaceDefinition
: namedNamespaceDefinition
| unnamedNamespaceDefinition
;
namedNamespaceDefinition
: originalNamespaceDefinition
| extensionNamespaceDefinition
;
originalNamespaceDefinition
: UNIT IDENTIFIER LBRACE namespaceBody RBRACE
;
extensionNamespaceDefinition
:UNIT originalNamespaceName LBRACE namespaceBody RBRACE
;
unnamedNamespaceDefinition
: UNIT LBRACE namespaceBody RBRACE
;
namespaceBody
: declarationSeq?
;
namespaceAlias
: IDENTIFIER
;
namespaceAliasDefinition
: UNIT IDENTIFIER ASSIGN qualifiedNamespaceSpecifier SEMI
;
qualifiedNamespaceSpecifier
: namespaceName
;
attributeSpecifierSeq
: attributeSpecifier
| attributeSpecifierSeq attributeSpecifier
;
attributeSpecifier
: LBRACK LBRACK attributeList RBRACK RBRACK
| alignmentSpecifier
;
alignmentSpecifier
: ALIGN_AS LPAREN thetypeid RPAREN
;
attributeList
: attribute?
| attributeList COMMA attribute?
;
attribute
: attributeToken attributeArgumentClause?
;
attributeToken
: IDENTIFIER
;
attributeArgumentClause
: LPAREN balancedTokenSeq RPAREN
;
balancedTokenSeq
: balancedToken?
| balancedTokenSeq balancedToken
;
balancedToken
: LPAREN balancedTokenSeq RPAREN
| LBRACK balancedTokenSeq RBRACK
| LBRACE balancedTokenSeq RBRACE
;
/** Declarators */
initDeclaratorList
: initDeclarator
| initDeclaratorList COMMA initDeclarator
;
initDeclarator
: declarator initializer?
;
declarator
: norefDeclarator parametersAndQualifiers trailingReturnType
;
norefDeclarator
: declaratorId attributeSpecifierSeq?
| norefDeclarator parametersAndQualifiers
| norefDeclarator LBRACK RBRACK attributeSpecifierSeq?
;
parametersAndQualifiers
: LPAREN parameterDeclarationClause RPAREN refQualifier? attributeSpecifierSeq?
;
trailingReturnType
: COLONCOLON trailingTypeSpecifierSeq
;
refQualifier
: BIN_AND
;
declaratorId
: idExpression
;
thetypeid
: typeSpecifierSeq
;
parameterDeclarationClause
: parameterDeclaration
| parameterDeclarationList
;
parameterDeclarationList
: parameterDeclaration
| parameterDeclarationList COMMA parameterDeclaration
;
parameterDeclaration
: attributeSpecifierSeq? declSpecifierSeq declarator
| attributeSpecifierSeq? declSpecifierSeq declarator ASSIGN initializerClause
;
functionDefinition
: attributeSpecifierSeq? declSpecifierSeq? declarator functionBody
;
functionBody
: ctorInitializer? compoundStatement
;
initializer
: braceOrEqualInitializer
| LPAREN expressionList RPAREN
;
braceOrEqualInitializer
: ASSIGN initializerClause
| bracedInitList
;
initializerClause
: assignementExpression
| bracedInitList
;
initializerList
: initializerClause
| initializerList COMMA initializerClause
;
bracedInitList
: LBRACE initializerList COMMA? RBRACE
| LBRACE RBRACE
;
/** Types */
className
: IDENTIFIER
;
classSpecifier
: classHead LBRACE memberSpecification? RBRACE
;
classHead
: classKey attributeSpecifierSeq? classHeadName
| classKey attributeSpecifierSeq?
;
classHeadName
: className
;
classKey
: DTYPE
;
memberSpecification
: memberDeclaration memberSpecification?
;
memberDeclaration
: attributeSpecifierSeq? declSpecifierSeq? memberDeclaratorList? SEMI
| aliasDeclaration
| emptyDeclaration
;
memberDeclaratorList
: memberDeclarator
| memberDeclaratorList COMMA memberDeclarator
;
memberDeclarator
: declarator braceOrEqualInitializer?
;
/** Special member functions */
ctorInitializer
: COLON memInitializerList
;
memInitializerList
: memInitializer
| memInitializer COMMA memInitializerList
;
memInitializer
: memInitializerId LPAREN expressionList? RPAREN
| memInitializerId bracedInitList
;
memInitializerId
: IDENTIFIER
;
/** Special parser rules */
literal
: BOOL_LITERAL
| CHAR_LITERAL
| DECIMAL_LITERAL
| BIN_LITERAL
| HEX_LITERAL
| FLOAT_LITERAL;
/*
// types:
type
: simpleType
| aliasType
;
simpleType
: BOOLEAN
| CHAR
| INTEGER8
| INTEGER16
| INTEGER32
| INTEGER64
| REAL16
| REAL32
| REAL64
| VOID
;
function
: type IDENTIFIER '(' ')' block
| error
;
block
: '{' statement* '}'
;
topLevelStatement
: alias eol=';'?
;
statement
: (define eol=';'? | declare eol=';'?)
| alias eol=';'?
| ret eol=';'?
| eol=';'
| error
;
// variables
expression
: (IDENTIFIER | literal | lparen='(' expression ')')
| uop=('+' | '-' | '!' | '~') expression
| expression bop=('*' | '/') expression
| expression bop=('+' | '-') expression
| expression bop=('<=' | '>=' | '<' | '>' | '==' | '!=') expression
| expression bop=( '&' | '^' | '|' | '&&' |'||') expression
;
assign
: IDENTIFIER eop='=' expression
;
define
: declare eop='=' expression
;
declare
: type IDENTIFIER
;
alias
: WITH IDENTIFIER eop='=' type
;
ret
: RET expression;
// primitives
error
: err=~WS; */