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module Fun.Grammar where
import Fun.Parser
import Fun.Tree
import Fun.Typer
-- TODO: Multiple programs (= files) in tree
tree :: Parser Tree
tree = program >>> build >>> Tree <?> "tree" where build p = [p]
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"
functionName :: Parser String
functionName =
(special <|> letter)
<+> iter (special <|> alphanum)
>>> build
<?> "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) = (map resolveType a) ++ [resolveType b]
functionType :: Parser String
functionType =
(letter <=> isUpper) <+> oneOrMore alphanum >>> build <?> "function type"
where build (first, rest) = first : rest
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"]
functionFlag :: Parser String
functionFlag = letters <=> (`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
functionBody :: Parser FunctionBody
functionBody =
iter (space <-+> functionBodyElement)
<+-> newline
>>> FunctionBody
<?> "function body"
functionBodyElement :: Parser FunctionBodyElement
functionBodyElement =
statement
<|> (functionName >>> FunctionBodyIdentifier)
<|> (functionParameter >>> FunctionBodyIdentifier)
<|> (string >>> FunctionBodyString)
<|> (number >>> FunctionBodyNumber)
<?> "function body element"
statement :: Parser FunctionBodyElement -- TODO
statement = accept "if" >>> Statement
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