48 lines
1.3 KiB
Haskell
48 lines
1.3 KiB
Haskell
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-- Simple example to show parsing some SQL then pretty printing the AST
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import System.Environment
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import Text.Show.Pretty
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import System.IO
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import Language.SQL.SimpleSQL.Parse
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(parseStatements
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,ParseError
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,peFormattedError)
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import Language.SQL.SimpleSQL.Syntax (ansi2011, Statement)
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main :: IO ()
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main = do
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args <- getArgs
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case args of
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[] -> do
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-- read from stdin
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c <- getContents
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doIt c
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["-s", sql] -> do
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-- parse arg given
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doIt sql
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[f] ->
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-- read file
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withFile f ReadMode (\h -> do
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x <- hGetContents h
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doIt x)
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_ -> do
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putStrLn "use no arguments to stream sql from stdin, e.g.:\n\
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\ cat some.sql | SimpleSQLParserExample\n\
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\n\
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\use -s to parse sql on command line, e.g.:\n\
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\ SimpleSQLParserExample -s \"select * from t\"\n\
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\use a single arg to parse a file, e.g.\n\
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\ SimpleSQLParserExample some.sql"
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doIt :: String -> IO ()
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doIt src = do
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let parsed :: Either ParseError [Statement]
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parsed = parseStatements ansi2011 "" Nothing src
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either (error . peFormattedError)
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(putStrLn . ppShow)
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parsed
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