module Lentil.Parse.SourceSpec where

import Test.Hspec
import Text.Parsec (runParser)
import Text.Parsec.Char
import Text.Parsec.Combinator
import Control.Applicative

import Lentil.Parse.Source

-- Parsing tests

-- simple parser
sp :: ParSource a -> String -> Maybe a
sp p cs = either (const Nothing) Just
                 (runParser p () fp cs)
    where fp = "<f>"


main :: IO ()
main = hspec spec


spec :: Spec
spec = do

  describe "manyTill1" $ do
    it "behaves like manyTill on non-empty string" $
      sp (manyTill1 anyChar newline) "foo\n" `shouldBe`
      sp (manyTill anyChar newline) "foo\n"
    it "doesn't runtime crash on a empty string (instead returns [])" $
      sp (manyTill1 anyChar newline) "" `shouldBe` Just []

  describe "lineComment" $ do
    it "parses a line comment" $
      sp (lineComment "//") "// Test\n" `shouldBe` Just " Test\n"
    it "fails without trailing \\n" $
      sp (lineComment "//") "// Test"   `shouldBe` Nothing

  describe "blockComment" $ do
    it "parses a block comment" $
      sp (blockComment ("/*","*/")) "/* Test\n2 */" `shouldBe`
         Just " Test\n2 "

  describe "litString" $ do
    it "parses code string" $
      sp (litString '"') "\"palla\"" `shouldBe` Just "palla"
    it "parses code string with escaped \" inside" $
      sp (litString '"') "\"pal\\\"la\"" `shouldBe` Just "pal\"la"
    it "parses code string with comments symbols inside" $
      sp (litString '"') "\"pal#la\"" `shouldBe` Just "pal#la"

  describe "litChar" $ do
    it "parses a string literal character inside" $
      sp (litChar '\'') "'a'" `shouldBe`  Just 'a'
    it "parses escaped characters too" $
      sp (litChar '\'') "'\"'" `shouldBe` Just '\"'

  let hss = ParSyntax ["--"] [("{-", "-}")] ['"']  ['\'']
  describe "program" $ do
    it "parses program instructions till eof" $
      sp (program hss) "prova " `shouldBe`  Just "prova "
    it "stops at single-line comment" $
      sp (program hss) "prova -- " `shouldBe`  Just "prova "
    it "stops at blockcomment" $
      sp (program hss) "prova {- " `shouldBe`  Just "prova "
    it "stops at literal string" $
      sp (program hss) "prova \"babby " `shouldBe`  Just "prova "
    it "stops at literal char" $
      sp (program hss) "prova ' '" `shouldBe`  Just "prova "
    it "stops at ' which is not a literal char" $
      sp (program hss) "prova' " `shouldBe`  Just "prova' "

  let rbs = ParSyntax ["#"] [] ['"', '\'']  []
  describe "source" $ do
    it "parses one piece of source (line-comment)" $
      sp (source hss) "-- hey\n my " `shouldBe`  Just " hey\n"
    it "parses one piece of source (block-comment)" $
      sp (source hss) "{-hey-}\n my " `shouldBe`  Just "hey"
    it "parses one piece of source (string-literal)" $
      sp (source hss) "\"hey\"" `shouldBe`  Just ""
    it "parses a string for language with ' and \" available" $
      sp (source rbs) "\"he#y\"" `shouldBe`  Just ""
    it "parses one piece of source (char-literal)" $
      sp (source hss) "\'h\'" `shouldBe`  Just ""
    it "parses one piece of source (program instructions)" $
      sp (source hss) "prime'" `shouldBe`  Just ""

  describe "commentParser" $ do
    beforeAll (readFile "test/test-files/lang-comm/out.blocks") $ do
      it "parses a haskell source" (\a ->
        commentParser "test/test-files/lang-comm/haskell.hs" >>= \s ->
        s `shouldBe` Just a)
      it "parses a C source" (\a ->
        commentParser "test/test-files/lang-comm/clang.c" >>= \s ->
        s `shouldBe` Just a)
      it "parses a Pascal source" (\a ->
        commentParser "test/test-files/lang-comm/pascal.pas" >>= \s ->
        s `shouldBe` Just a)
      it "parses a plain text source" (\a ->
        commentParser "test/test-files/lang-comm/text.txt" >>= \s ->
        s `shouldBe` Just a)
      it "parses a javascript source" (\a ->
        commentParser "test/test-files/lang-comm/javascript.js" >>= \s ->
        s `shouldBe` Just a)
      it "parses a python source" (\a ->
        commentParser "test/test-files/lang-comm/python.py" >>= \s ->
        s `shouldBe` Just a)
      it "parses a ruby source" (\a ->
        commentParser "test/test-files/lang-comm/ruby.rb" >>= \s ->
        s `shouldBe` Just a)