{-# LANGUAGE OverloadedStrings #-}

module Parser where

import Data.Text (Text)
import Test.Tasty (TestTree)

import qualified Control.Exception
import qualified Data.Text
import qualified Data.Text.Lazy.IO
import qualified Dhall.Parser
import qualified Test.Tasty
import qualified Test.Tasty.HUnit

parserTests :: TestTree
parserTests =
    Test.Tasty.testGroup "parser tests"
        [ Test.Tasty.testGroup "whitespace"
            [ shouldParse
                "prefix/suffix"
                "./tests/parser/whitespace.dhall"
            , shouldParse
                "block comment"
                "./tests/parser/blockComment.dhall"
            , shouldParse
                "nested block comment"
                "./tests/parser/nestedBlockComment.dhall"
            , shouldParse
                "line comment"
                "./tests/parser/lineComment.dhall"
            , shouldParse
                "Unicode comment"
                "./tests/parser/unicodeComment.dhall"
            , shouldParse
                "whitespace buffet"
                "./tests/parser/whitespaceBuffet.dhall"
            , shouldParse
                "label"
                "./tests/parser/label.dhall"
            , shouldParse
                "quoted label"
                "./tests/parser/quotedLabel.dhall"
            , shouldParse
                "double quoted string"
                "./tests/parser/doubleQuotedString.dhall"
            , shouldParse
                "Unicode double quoted string"
                "./tests/parser/unicodeDoubleQuotedString.dhall"
            , shouldParse
                "escaped double quoted string"
                "./tests/parser/escapedDoubleQuotedString.dhall"
            , shouldParse
                "interpolated double quoted string"
                "./tests/parser/interpolatedDoubleQuotedString.dhall"
            , shouldParse
                "single quoted string"
                "./tests/parser/singleQuotedString.dhall"
            , shouldParse
                "escaped single quoted string"
                "./tests/parser/escapedSingleQuotedString.dhall"
            , shouldParse
                "interpolated single quoted string"
                "./tests/parser/interpolatedSingleQuotedString.dhall"
            , shouldParse
                "double"
                "./tests/parser/double.dhall"
            , shouldParse
                "natural"
                "./tests/parser/natural.dhall"
            , shouldParse
                "identifier"
                "./tests/parser/identifier.dhall"
            , shouldParse
                "paths"
                "./tests/parser/paths.dhall"
            , shouldParse
                "path termination"
                "./tests/parser/pathTermination.dhall"
            , shouldParse
                "urls"
                "./tests/parser/urls.dhall"
            , shouldParse
                "environmentVariables"
                "./tests/parser/environmentVariables.dhall"
            , shouldParse
                "lambda"
                "./tests/parser/lambda.dhall"
            , shouldParse
                "if then else"
                "./tests/parser/ifThenElse.dhall"
            , shouldParse
                "let"
                "./tests/parser/let.dhall"
            , shouldParse
                "forall"
                "./tests/parser/forall.dhall"
            , shouldParse
                "function type"
                "./tests/parser/functionType.dhall"
            , shouldParse
                "operators"
                "./tests/parser/operators.dhall"
            , shouldParse
                "annotations"
                "./tests/parser/annotations.dhall"
            , shouldParse
                "merge"
                "./tests/parser/merge.dhall"
            , shouldParse
                "constructors"
                "./tests/parser/constructors.dhall"
            , shouldParse
                "fields"
                "./tests/parser/fields.dhall"
            , shouldParse
                "record"
                "./tests/parser/record.dhall"
            , shouldParse
                "union"
                "./tests/parser/union.dhall"
            , shouldParse
                "list"
                "./tests/parser/list.dhall"
            , shouldParse
                "builtins"
                "./tests/parser/builtins.dhall"
            , shouldParse
                "large expression"
                "./tests/parser/largeExpression.dhall"
            , shouldParse
                "names that begin with reserved identifiers"
                "./tests/parser/reservedPrefix.dhall"
            , shouldParse
                "interpolated expressions with leading whitespace"
                "./tests/parser/template.dhall"
            ]
        ]

shouldParse :: Text -> FilePath -> TestTree
shouldParse name path = Test.Tasty.HUnit.testCase (Data.Text.unpack name) (do
    text <- Data.Text.Lazy.IO.readFile path
    case Dhall.Parser.exprFromText mempty text of
        Left err -> Control.Exception.throwIO err
        Right _  -> return () )