Eloquent-JavaScript/renderer/Highlight.hs at master · aeminem/Eloquent-JavaScript · GitHub

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module Highlight (highlightStatements, highlightExpression) where

import Html

import Text.ParserCombinators.Parsec

import Data.Char

import Data.Map hiding (map, null)

import Data.Set hiding (map, null)

-- Parser

deriving (Show, Eq)

wordTypes :: Map String WordType

wordTypes = Data.Map.fromList([("if", LikeIf), ("switch", LikeIf), ("while", LikeIf), ("with", LikeIf),

("else", LikeDo), ("do", LikeDo), ("try", LikeDo), ("finally", LikeDo),

("return", LikeNew), ("break", LikeNew), ("continue", LikeNew),

("new", LikeNew), ("delete", LikeNew), ("throw", LikeNew),

("in", Operator), ("typeof", Operator), ("instanceof", Operator),

("var", Var), ("for", For), ("case", Case), ("function", Function), ("catch", Catch),

("true", Atom), ("false", Atom), ("undefined", Atom), ("null", Atom),

("NaN", Atom), ("Infinity", Atom)]);

wordType :: String -> WordType

wordType word = findWithDefault Variable word wordTypes

data PState = PS [[String]] [(String, String)]

output :: String -> String -> CharParser PState ()

output text style = updateState write

where write (PS env out) = PS env ((text, style):out)

getOutput :: CharParser PState [(String, String)]

getOutput = do (PS _ ps) <- getState

return ps

pushContext :: CharParser PState ()

pushContext = updateState push

where push (PS env out) = PS (["arguments", "this"]:env) out

popContext :: CharParser PState ()

popContext = updateState pop

where pop (PS (e:es) out) = PS es out

registerVariable :: String -> CharParser PState Bool

registerVariable name = do PS env out <- getState

if (null env)

then return False

else do setState (PS (update env) out)

return True

where update (e:es) = ((name:e):es)

isLocalVariable :: String -> CharParser PState Bool

isLocalVariable name = do PS env _ <- getState

return ((any (elem name)) env)

punctuation :: Char -> CharParser PState ()

punctuation c = do char c

output [c] "punctuation"

commaSep :: CharParser PState a -> CharParser PState [a]

commaSep p = sepBy p (punctuation ',')

zeroOrOne :: CharParser st t -> CharParser st [t]

zeroOrOne p = do one <- p

return [one]

<|> return []

symbolOperator :: CharParser st [Char]

symbolOperator = many1 (oneOf "+-*&%/=<>!|")

wordOperator :: CharParser st [Char]

wordOperator = do name <- word

if (wordType name /= Operator)

then unexpected name

else return name

operator :: CharParser PState ()

operator = do op <- (symbolOperator <|> wordOperator)

output op "operator"

keyword :: String -> CharParser PState ()

keyword name = do string name

output name "keyword"

untilUnescaped :: Char -> CharParser st [Char]

untilUnescaped c = do next <- anyChar

if (next == c)

then return [next]

else if (next == '\\')

then do next' <- anyChar

rest <- untilUnescaped c

return (next:next':rest)

else do rest <- untilUnescaped c

return (next:rest)

regexp, stringValue, numberValue, hexNumberValue, ws :: CharParser PState ()

regexp = do char '/'

content <- untilUnescaped '/'

options <- many (oneOf "ig")

output ('/':(content ++ options)) "string"

stringValue = do delimiter <- (char '"' <|> char '\'')

content <- untilUnescaped delimiter

output (delimiter:content) "string"

numberValue = do digits <- many1 digit

dot <- ((try afterDot) <|> return "")

exp <- (exponent <|> return "")

output (digits ++ dot ++ exp) "atom"

where afterDot = do char '.'

digits <- many1 digit

return ('.':digits)

exponent = do exp <- oneOf "eE"

minus <- zeroOrOne (char '-')

digits <- many digit

return (exp:(minus ++ digits))

hexNumberValue = do x <- try (do char '0'

oneOf "xX")

digits <- many1 (satisfy isHexDigit)

output ('0':x:digits) "atom"

ws = spaces <|> (try lineComment) <|> (try comment) <|> return ()

where spaces = do space <- many1 (satisfy isSpace)

output space "whitespace"

lineComment = do string "//"

content <- many (satisfy (/='\n'))

output ("//" ++ content) "comment"

comment = do string "/*"

content <- manyTill anyChar (try (string "*/"))

output ("/*" ++ content ++ "*/") "comment"

word :: CharParser st [Char]

word = do start <- satisfy varStart

rest <- many (satisfy varLetter)

return (start:rest)

where varStart c = isAlpha c || c == '_' || c == '$'

varLetter c = varStart c || isDigit c

statement :: CharParser PState ()

statement = (punctuation ';') <|> block <|> wordStatement <|> exprStatement

where block = do punctuation '{'

many statement

punctuation '}'

exprStatement = do expression

punctuation ';'

wordStatement, wordExpression :: CharParser PState ()

wordStatement = do start <- word

perform start (action start)

where perform start (Just act) = do output start "keyword"

act

perform start Nothing = (try (label start)) <|> (expr start)

label start = do output start "property"

punctuation ':'

expr start = do wordExpression' start

punctuation ';'

action word =

case (wordType word)

of LikeIf -> Just (do punctuation '('

expression

punctuation ')'

statement)

LikeDo -> Just statement

Function -> Just functionDef

Var -> Just (do commaSep variableDef

punctuation ';')

Catch -> Just (do pushContext

punctuation '('

newVariable

punctuation ')'

statement

popContext)

For -> Just (do punctuation '('

(try forIn) <|> normalFor

punctuation ')'

statement)

Case -> Just (do expression

punctuation ':'

statement)

otherwise -> Nothing

forIn = do optional (keyword "var")

newVariable

keyword "in"

expression

normalFor = do statement

optional expression

punctuation ';'

optional expression

wordExpression = do start <- word

wordExpression' start

wordExpression' :: String -> CharParser PState ()

wordExpression' start =

case (wordType start)

of LikeNew -> do name "keyword"

optional expression

Operator -> do name "operator"

expression

Function -> do name "keyword"

functionDef

Atom -> do name "atom"

maybeOperator

Variable -> do local <- isLocalVariable start

name (case local of {True -> "localvariable"; False -> "variable"})

maybeOperator

where name n = do output start n

newVariable, variableDef, functionDef, propertyName, objectLiteral, arrayLiteral,

expression, postFixOperator, maybeOperator :: CharParser PState ()

newVariable = do name <- word

local <- registerVariable name

output name (case local of {True -> "variabledef"; False -> "variable"})

variableDef = do newVariable

optional assignment

where assignment = do punctuation '='

expression

functionDef = do optional newVariable

pushContext

punctuation '('

commaSep newVariable

punctuation ')'

statement

popContext

propertyName = do name <- word

output name "property"

objectLiteral = do punctuation '{'

commaSep property

punctuation '}'

where property = do (stringValue <|> numberValue <|> hexNumberValue <|> propertyName)

punctuation ':'

expression

arrayLiteral = do punctuation '['

commaSep expression

punctuation ']'

objectLiteral <|> arrayLiteral <|> wordExpression)

maybeOperator

<|> do operator

expression

where parenthesed = do punctuation '('

expression

punctuation ')'

postFixOperator = do op <- (string "++") <|> (string "--")

output op "operator"

maybeOperator = funCall <|> propValue <|> propSubscript <|> (try postFixOperator) <|> choiceOperator

<|> operator' <|> return ()

where operator' = do operator

expression

choiceOperator = do punctuation '?'

expression

punctuation ':'

expression

funCall = do punctuation '('

commaSep expression

punctuation ')'

maybeOperator

propValue = do punctuation '.'

propertyName

maybeOperator

propSubscript = do punctuation '['

expression

punctuation ']'

maybeOperator

-- Html generation

significantStyles :: Set String

significantStyles = Data.Set.fromList ["keyword", "atom", "variable", "string", "variabledef",

"localvariable", "property", "comment"];

simplifyOutput :: [(String, String)] -> [(String, String)]

simplifyOutput output = simplify (map removeStyle output)

where removeStyle (value, style) | Data.Set.member style significantStyles = (value, style)

| otherwise = (value, "")

simplify [] = []

simplify [o] = [o]

simplify ((v1, s1):rest) = let a@((v2, s2):rest') = simplify rest

in if (s2 == s1)

then ((v1 ++ v2, s1):rest')

else ((v1, s1):a)

toHtml :: (String, String) -> HTML

toHtml (value, "") = Tx value

toHtml (value, style) = Tg "span" [("class", style)] [Tx value]

highlightOutput :: [(String, String)] -> [HTML]

highlightOutput = (map toHtml) . simplifyOutput . reverse

highlightStatements, highlightExpression :: String -> [HTML]

highlightStatements = highlight (do {ws; many statement; eof; getOutput})

highlightExpression = highlight (do {ws; expression; eof; getOutput})

highlight :: CharParser PState [(String, String)] -> String -> [HTML]

highlight parser code = case runParser parser (PS [] []) "" code

of Right ps -> highlightOutput ps

Left err -> error ("In code:\n\n" ++ code ++ "\n\nParse error at " ++ (show err))

Eloquent-JavaScript/renderer/Highlight.hs at master · aeminem/Eloquent-JavaScript · GitHub

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