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from parsimonious import TokenGrammar, ParseError, IncompleteParseError # type: ignore
grammar = TokenGrammar(
r"""
HeaderFile <- IncludeStatement* HeaderFileElement+
HeaderFileElement <- TypeDefinition / FunctionDeclaration / VariableDefinition / VariableDeclaration
ImplementationFile <- IncludeStatement* ImplementationFileElement+
ImplementationFileElement <- TypeDefinition / VariableDefinition / FunctionDefinition
IncludeStatement <- 'include' string-literal ';'
TypeDefinition <- StructDefinition / EnumDefinition / UnionDefinition
StructDefinition <- NormalStructDefinition / OpaqueStructDefinition
NormalStructDefinition <- 'struct' identifier '{' VariableDeclaration+ '}'
OpaqueStructDefinition <- 'opaque' 'struct' identifier ';'
EnumDefinition <- 'enum' identifier '{' EnumMember (',' EnumMember)* ','? '}'
EnumMember <- identifier ('=' Expression)?
UnionDefinition <- RobustUnionDefinition / FragileUnionDefinition
RobustUnionDefinition <- 'union' identifier '{' VariableDeclaration UnionBody '}'
UnionBody <- 'switch' '(' identifier ')' '{' UnionBodySet+ '}'
UnionBodySet <- CaseSpecifier+ (VariableDeclaration / ';')
FragileUnionDefinition <- 'fragile' 'union' identifier '{' VariableDeclaration+ '}'
FunctionDeclaration <- FunctionSignature ';'
FunctionDefinition <- FunctionSignature Block
FunctionSignature <- Type identifier '(' SignatureArguments? ')'
SignatureArguments <- Type identifier (',' Type identifier)* ','?
Block <- '{' Statement* '}'
Statement <- VariableDefinition / StructureStatement / FlowControlStatement / AssignmentStatement / FragileStatement / ExpressionStatement / EmptyStatement
EmptyStatement <- ';'
FragileStatement <- 'fragile' Statement
ExpressionStatement <- Expression ';'
VariableDeclaration <- Type identifier ';'
VariableDefinition <- Type identifier '=' Expression ';'
StructureStatement <- IfStatement / SwitchStatement / WhileStatement / DoWhileStatement / ForStatement
IfStatement <- 'if' '(' Expression ')' Block ('else' Block)?
SwitchStatement <- 'switch' '(' Expression ')' '{' (CaseSpecifier / Statement)+ '}'
CaseSpecifier <- ('case' Expression ':') / ('default' ':')
WhileStatement <- 'while' '(' Expression ')' Block
DoWhileStatement <- 'do' Block 'while' '(' Expression ')' ';'
ForStatement <- 'for' '(' ForInit? ';' Expression ';' ForUpdate? ')' Block
ForInit <- ForInitializer (',' ForInitializer)* ','?
ForInitializer <- Type identifier '=' Expression
ForUpdate <- AssignmentBody (',' AssignmentBody)* ','?
FlowControlStatement <- ContinueStatement / BreakStatement / ReturnStatement
ContinueStatement <- 'continue' ';'
BreakStatement <- 'break' ';'
ReturnStatement <- 'return' Expression? ';'
AssignmentStatement <- AssignmentBody ';'
AssignmentBody <- DirectAssignmentBody / UpdateAssignmentBody / CrementAssignmentBody
DirectAssignmentBody <- Expression '=' Expression
UpdateAssignmentBody <- Expression ('+=' / '-=' / '*=' / '/=' / '%=' / '&=' / '^=' / '|=') Expression
CrementAssignmentBody <- Expression ('++' / '--')
Type <- ConstType / PointerType / ArrayType / FunctionType / BasicType
ConstType <- 'const' BasicType
PointerType <- BasicType '*'
ArrayType <- BasicType '[' Expression ']'
FunctionType <- BasicType 'function' '(' FunctionTypeArgs? ')'
FunctionTypeArgs <- BasicType (',' BasicType)* ','?
BasicType <- 'void' / 'bool' / 'float32' / 'float64' /
'int8' / 'int16' / 'int32' / 'int64' / 'intaddr' / 'intmax' / 'intsize' /
'uint8' / 'uint16' / 'uint32' / 'uint64' / 'uintaddr' / 'uintmax' / 'uintsize' /
('struct' identifier) / ('enum' identifier) / ('union' identifier) / ('(' Type ')')
AtomicExpression <- identifier / constant / 'true' / 'false' / string-literal / ('(' Expression ')')
ObjectExpression <- (AtomicExpression ObjectSuffix*) / ArrayLiteral / StructLiteral
ObjectSuffix <- ArrayIndexSuffix / FunctionCallSuffix / StructElementSuffix / StructPointerElementSuffix
ArrayIndexSuffix <- '[' Expression ']'
FunctionCallSuffix <- '(' CommasExpressionList? ')'
CommasExpressionList <- Expression (',' Expression)* ','?
StructElementSuffix <- '.' identifier
StructPointerElementSuffix <- '->' identifier
ArrayLiteral <- '{' CommasExpressionList '}'
StructLiteral <- '{' StructLiteralElement (',' StructLiteralElement)* ','? '}'
StructLiteralElement <- '.' identifier '=' Expression
FactorExpression <- CastExpression / AddressOfExpression / DerefExpression / PositiveExpression / NegativeExpression / BitwiseNotExpression / LogicalNotExpression / SizeofExpression / ObjectExpression
CastExpression <- '(' Type ')' ObjectExpression
AddressOfExpression <- '&' ObjectExpression
DerefExpression <- '*' ObjectExpression
PositiveExpression <- '+' ObjectExpression
NegativeExpression <- '-' ObjectExpression
BitwiseNotExpression <- '~' ObjectExpression
LogicalNotExpression <- '!' ObjectExpression
SizeofExpression <- ('sizeof' ObjectExpression) / ('sizeof' Type)
TermExpression <- FactorExpression TermSuffix?
TermSuffix <- ('*' FactorExpression)+ / ('/' FactorExpression)+ / ('%' FactorExpression)+
ArithmeticExpression <- TermExpression ArithmeticSuffix?
ArithmeticSuffix <- ('+' TermExpression)+ / ('-' TermExpression)+
BitwiseOpExpression <- ShiftExpression / XorExpression / BitwiseAndExpression / BitwiseOrExpression / ArithmeticExpression
ShiftExpression <- (ArithmeticExpression '<<' ArithmeticExpression) / (ArithmeticExpression '>>' ArithmeticExpression)
XorExpression <- ArithmeticExpression '^' ArithmeticExpression
BitwiseAndExpression <- ArithmeticExpression ('&' ArithmeticExpression)+
BitwiseOrExpression <- ArithmeticExpression ('|' ArithmeticExpression)+
ComparisonExpression <- EqualExpression / NotEqualExpression / LessEqExpression / GreaterEqExpression / LessThanExpression / GreaterThanExpression / BitwiseOpExpression
EqualExpression <- BitwiseOpExpression '==' BitwiseOpExpression
NotEqualExpression <- BitwiseOpExpression '!=' BitwiseOpExpression
LessEqExpression <- BitwiseOpExpression '<=' BitwiseOpExpression
GreaterEqExpression <- BitwiseOpExpression '>=' BitwiseOpExpression
LessThanExpression <- BitwiseOpExpression '<' BitwiseOpExpression
GreaterThanExpression <- BitwiseOpExpression '>' BitwiseOpExpression
LogicalOpExpression <- LogicalAndExpression / LogicalOrExpression / ComparisonExpression
LogicalAndExpression <- ComparisonExpression ('&&' ComparisonExpression)+
LogicalOrExpression <- ComparisonExpression ('||' ComparisonExpression)+
Expression <- LogicalOpExpression
identifier = "identifier"
constant = "constant"
string_literal = "string_literal"
""".replace(' <- ', ' = ').replace('string-literal', 'string_literal'))
class LegibleParseError(ParseError):
def line(self):
return "🤷"
def column(self):
return "🤷"
class LegibleIncompleteParseError(IncompleteParseError):
def line(self):
return "🤷"
def column(self):
return "🤷"
def parse_from_rule(rule, tokens):
try:
return rule.parse(tokens)
except IncompleteParseError as error:
raise LegibleIncompleteParseError(error.text, error.pos, error.expr)
except ParseError as error:
raise LegibleParseError(error.text, error.pos, error.expr)
def parse_header(tokens):
return parse_from_rule(grammar['HeaderFile'], tokens)
def parse_implementation(tokens):
return parse_from_rule(grammar['ImplementationFile'], tokens)
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