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from parsimonious import TokenGrammar, ParseError, IncompleteParseError # type: ignore
grammar = TokenGrammar(
r"""
HeaderFile = HeaderFileElement+
HeaderFileElement = IncludeStatement /
TypeDeclaration /
FunctionDeclaration
ImplementationFile = ImplementationFileElement+
ImplementationFileElement = HeaderFileElement /
FunctionDefinition
IncludeStatement = "include" string_literal ";"
TypeDeclaration = StructDeclaration /
EnumDeclaration /
TypedefDeclaration
StructDeclaration = "struct" identifier "{" VariableDeclaration+ "}" ";"
EnumDeclaration = "enum" identifier "{" EnumBody "}" ";"
EnumBody = (identifier ("=" Expression)? "," EnumBody) /
(identifier ("=" Expression)? ","?)
TypedefDeclaration = "typedef" identifier "=" Type ";"
FunctionDeclaration = FunctionSignature ";"
FunctionDefinition = FunctionSignature Block
FunctionSignature = Type identifier "(" SignatureArguments? ")"
SignatureArguments = (Type identifier "," SignatureArguments) /
(Type identifier ","?)
Block = "{" Statement* "}"
Statement = VariableDefinition /
VariableDeclaration /
IfStatement /
SwitchStatement /
WhileStatement /
DoWhileStatement /
ForStatement /
FlowControlStatement /
AssignmentStatement /
ExpressionStatement
VariableDefinition = Type identifier "=" Expression ";"
VariableDeclaration = Type identifier ";"
IfStatement = ("if" Expression Block "else" Block) /
("if" Expression Block)
SwitchStatement = "switch" Expression "{" SwitchCase+ "}"
SwitchCase = (CaseSpecifier Block) /
("default" Block)
CaseSpecifier = ("case" Expression "," CaseSpecifier) /
("case" Expression ","?)
WhileStatement = "while" Expression Block
DoWhileStatement = "do" Block "while" Expression ";"
ForStatement = "for" VariableDefinition? ";" Expression ";" AssignmentStatementBody? Block
FlowControlStatement = ("continue" ";") /
("break" ";") /
("return" Expression? ";")
AssignmentStatement = AssignmentStatementBody ";"
AssignmentStatementBody = (AssignmentTargetExpression "=" Expression) /
(AssignmentTargetExpression "+=" Expression) /
(AssignmentTargetExpression "-=" Expression) /
(AssignmentTargetExpression "*=" Expression) /
(AssignmentTargetExpression "/=" Expression) /
(AssignmentTargetExpression "%=" Expression) /
(AssignmentTargetExpression "&=" Expression) /
(AssignmentTargetExpression "^=" Expression) /
(AssignmentTargetExpression "|=" Expression) /
(AssignmentTargetExpression "++") /
(AssignmentTargetExpression "--")
ExpressionStatement = Expression ";"
Type = ("const" BasicType) /
(BasicType "*") /
(BasicType "[" Expression "]") /
(BasicType "function" "(" (BasicType ",")* ")") /
BasicType
BasicType = "void" /
IntegerType /
("signed" IntegerType) /
("unsigned" IntegerType) /
"float" /
"double" /
"bool" /
("struct" identifier) /
("enum" identifier) /
("typedef" identifier) /
("(" Type ")")
IntegerType = "char" /
"short" /
"int" /
"long"
AssignmentTargetExpression = identifier ATEElementSuffix*
ATEElementSuffix = ("[" Expression "]") /
("." identifier) /
("->" identifier)
AtomicExpression = identifier /
constant /
string_literal /
("(" Expression ")")
ObjectExpression = (AtomicExpression ObjectSuffix*) /
ArrayLiteralExpression /
StructLiteralExpression
ObjectSuffix = ("[" Expression "]") /
("(" CommasExpressionList? ")") /
("." identifier) /
("->" identifier)
CommasExpressionList = (Expression "," CommasExpressionList) /
(Expression ","?)
ArrayLiteralExpression = "{" CommasExpressionList "}"
StructLiteralExpression = "{" StructLiteralBody "}"
StructLiteralBody = (StructLiteralElement "," StructLiteralBody?) /
(StructLiteralElement ","?)
StructLiteralElement = "." identifier "=" Expression
FactorExpression = ("(" Type ")" FactorExpression) /
("&" FactorExpression) /
("*" FactorExpression) /
("+" FactorExpression) /
("-" FactorExpression) /
("~" FactorExpression) /
("!" FactorExpression) /
("sizeof" FactorExpression) /
("sizeof" Type) /
ObjectExpression
TermExpression = FactorExpression TermSuffix*
TermSuffix = ("*" FactorExpression) /
("/" FactorExpression) /
("%" FactorExpression)
ArithmeticExpression = TermExpression ArithmeticSuffix*
ArithmeticSuffix = ("+" TermExpression) /
("-" TermExpression)
BitwiseOpExpression = (ArithmeticExpression "<<" ArithmeticExpression) /
(ArithmeticExpression ">>" ArithmeticExpression) /
(ArithmeticExpression "^" ArithmeticExpression) /
(ArithmeticExpression ("&" ArithmeticExpression)+) /
(ArithmeticExpression ("|" ArithmeticExpression)+) /
ArithmeticExpression
ComparisonExpression = (BitwiseOpExpression "==" BitwiseOpExpression) /
(BitwiseOpExpression "!=" BitwiseOpExpression) /
(BitwiseOpExpression "<=" BitwiseOpExpression) /
(BitwiseOpExpression ">=" BitwiseOpExpression) /
(BitwiseOpExpression "<" BitwiseOpExpression) /
(BitwiseOpExpression ">" BitwiseOpExpression) /
BitwiseOpExpression
Expression = (ComparisonExpression ("&&" ComparisonExpression)+) /
(ComparisonExpression ("||" ComparisonExpression)+) /
ComparisonExpression
identifier = "identifier"
constant = "constant"
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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