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|
module Fun.Grammar where
import Fun.Parser
import Fun.Tree
import Fun.Typer
program :: Parser Program
program = iterFull block >>> Program <?> "program"
block :: Parser Block
block = functionBlock <+-> newline <|> functionBlock <+-> endOfFile <?> "block"
visibility :: Parser Visibility
visibility =
(literal '+' >>> const PublicVisibility)
<|> (literal '-' >>> const PrivateVisibility)
<?> "visibility"
functionBlock :: Parser Block
functionBlock = functionDeclaration <+> iter functionDefinition >>> build
where build (decl, defn) = FunctionBlock decl defn
functionDeclaration :: Parser FunctionDeclaration
functionDeclaration =
functionDeclarationWithoutFlags
<|> functionDeclarationWithFlags
<?> "function declaration"
functionDeclarationWithoutFlags :: Parser FunctionDeclaration
functionDeclarationWithoutFlags =
functionName
<+> functionDeclarationDelimiter
<+> functionTypes
<+-> newline
>>> build
<?> "function declaration without flags"
where build ((name, vis), types) = FunctionDeclaration name vis types []
functionDeclarationWithFlags :: Parser FunctionDeclaration
functionDeclarationWithFlags =
functionName
<+> functionDeclarationDelimiter
<+> functionTypes
<+-> space
<+-> functionFlagDelimiter
<+> functionFlagList
>>> build
<?> "function declaration with flags"
where
build (((name, vis), types), flags) =
FunctionDeclaration name vis types flags
functionDeclarationDelimiter :: Parser Visibility
functionDeclarationDelimiter =
space
<-+> literal ':'
<-+> visibility
<+-> literal ':'
<+-> space
<?> "function declaration delimiter"
internalFunctions :: [String]
internalFunctions = ["_start", "_asm"]
functionName :: Parser String
functionName =
letter
<+> iter (special <|> alphanum)
>>> build
<|> internalWord
<=> (`elem` internalFunctions)
<|> literal '('
<-+> functionInfixName
<+-> literal ')'
<?> "function name"
where build (first, rest) = first : rest
functionInfixName :: Parser String
functionInfixName =
(special <|> letter)
<+> iter (special <|> alphanum)
>>> build
<|> internalWord
<=> (`elem` internalFunctions)
<?> "infix function name"
where build (first, rest) = first : rest
functionTypes :: Parser [Type]
functionTypes =
iter (functionType <+-> space <+-> functionTypeDelimiter <+-> space)
<+> functionType
>>> build
<?> "function types"
where build (a, b) = a ++ [b]
internalTypes :: [String]
internalTypes = ["_void"]
functionType :: Parser Type
functionType =
(letter <=> isUpper)
<+> oneOrMore alphanum
>>> build
<|> internalWord
<=> (`elem` internalTypes)
>>> buildInternal
<|> literal '['
<-+> functionType
<+-> literal ']'
>>> buildList
<?> "function type"
where
build (first, rest) = resolveType $ first : rest
buildInternal t = resolveType t
buildList t = ListType t
functionTypeDelimiter :: Parser Char
functionTypeDelimiter = literal ':' <?> "function type delimiter"
functionFlagList :: Parser [FunctionFlag]
functionFlagList =
(iter (space <-+> functionFlag)) <+-> newline >>> build <?> "function flags"
where build list = map read list
functionFlagDelimiter :: Parser Char
functionFlagDelimiter = literal '%' <?> "function flag delimiter"
functionFlags :: [String]
functionFlags = ["inline", "deprecated", "danger-void", "danger-asm"]
functionFlag :: Parser String
functionFlag = specialWord <=> (`elem` functionFlags) <?> "function flag"
functionDefinition :: Parser FunctionDefinition
functionDefinition =
(functionPattern <+-> literal ':')
<+> functionBody
>>> build
<?> "function definition"
where build (pattern, body) = FunctionDefinition pattern body
functionPattern :: Parser FunctionPattern
functionPattern =
iter (functionPatternElement <+-> space)
>>> FunctionPattern
<?> "function pattern"
functionPatternElement :: Parser FunctionPatternElement
functionPatternElement =
(functionParameter >>> FunctionPatternParameter)
<|> (literal '_' >>> const FunctionPatternWildcard)
<|> (number >>> FunctionPatternNumber)
<|> (string >>> FunctionPatternString)
<?> "function pattern element"
functionParameter :: Parser String
functionParameter =
letters <|> (letter <+> oneOrMore alphanum) >>> build <?> "function parameter"
where build (a, b) = a : b
functionArgument :: Parser FunctionArgument
functionArgument =
(functionName >>> FunctionName)
<|> (functionParameter >>> FunctionParameter)
<|> (string >>> FunctionString)
<|> (number >>> FunctionNumber)
<?> "function argument"
functionBodyExpression :: Parser FunctionBody
functionBodyExpression =
(functionName <+> iter (space <-+> functionArgument) >>> buildCall)
<|> ( functionArgument -- TODO: Fixity precedence in parser? Hmmm
<+-> space
<+> functionInfixName
<+-> space
<+> functionArgument
>>> buildInfixCall
)
<|> (literal '(' <-+> functionBody <+-> literal ')' >>> FunctionBodySub)
where
buildCall (name, args) = FunctionBodyCall name args
buildInfixCall ((arg1, name), arg2) = FunctionBodyInfixCall name [arg1, arg2]
functionBody :: Parser FunctionBody
functionBody =
space
<-+> (functionBodyExpression <|> functionArgument >>> FunctionBodyValue)
<+-> newline
|
