From 0a4d3c8f12dc5797a919a00b6bcaf759947687cc Mon Sep 17 00:00:00 2001
From: Joris
Date: Sun, 17 Jun 2018 23:24:47 +0200
Subject: Add ouest france parser

---
 src/parser/haskell/Parser/LeboncoinParser.hs   | 24 +++++++++++++
 src/parser/haskell/Parser/OuestFranceParser.hs | 27 ++++++++++++++
 src/parser/haskell/Parser/Utils.hs             | 49 ++++++++++++++++++++++++++
 3 files changed, 100 insertions(+)
 create mode 100644 src/parser/haskell/Parser/LeboncoinParser.hs
 create mode 100644 src/parser/haskell/Parser/OuestFranceParser.hs
 create mode 100644 src/parser/haskell/Parser/Utils.hs

(limited to 'src/parser/haskell/Parser')

diff --git a/src/parser/haskell/Parser/LeboncoinParser.hs b/src/parser/haskell/Parser/LeboncoinParser.hs
new file mode 100644
index 0000000..48eb80f
--- /dev/null
+++ b/src/parser/haskell/Parser/LeboncoinParser.hs
@@ -0,0 +1,24 @@
+module Parser.LeboncoinParser
+  ( parse
+  ) where
+
+import           Data.Maybe        (catMaybes)
+import           Data.Text         (Text)
+import qualified Data.Text         as T
+import           Text.HTML.TagSoup
+
+import           Model.Ad          (Ad (Ad))
+import           Parser.Utils
+
+parse :: Text -> [Ad]
+parse page =
+  catMaybes . fmap parseAd $ partitions (~== "<a>") tags
+  where tags = getTagsBetween "<li itemtype=http://schema.org/Offer>" "<div class=information-immo_content>" (parseTags page)
+
+parseAd :: [Tag Text] -> Maybe Ad
+parseAd tags = do
+  name <- getTagTextAfter "<h2 class=item_title>" tags
+  location <- getTagAttribute "<meta itemprop=address>" (T.pack "content") tags
+  let price = getTagTextAfter "<h3 class=item_price>" tags
+  url <- getTagAttribute "<a>" (T.pack "href") tags
+  return (Ad name location price (T.concat [T.pack "https:", url]))
diff --git a/src/parser/haskell/Parser/OuestFranceParser.hs b/src/parser/haskell/Parser/OuestFranceParser.hs
new file mode 100644
index 0000000..a7b6360
--- /dev/null
+++ b/src/parser/haskell/Parser/OuestFranceParser.hs
@@ -0,0 +1,27 @@
+module Parser.OuestFranceParser
+  ( parse
+  ) where
+
+import           Data.Maybe        (catMaybes)
+import           Data.Text         (Text)
+import qualified Data.Text         as T
+
+import           Text.HTML.TagSoup
+
+import           Model.Ad          (Ad (Ad))
+
+import           Parser.Utils
+
+parse :: Text -> [Ad]
+parse page =
+  catMaybes . fmap parseAd $ partitions (~== "<a>") tags
+  where tags = getTagsBetween "<div id=listAnnonces>" "<div id=interactions>" (parseTags page)
+
+parseAd :: [Tag Text] -> Maybe Ad
+parseAd tags = do
+  name <- getTagTextAfter "<span class=annTitre>" tags
+  location <- getTagTextAfter "<span class=annVille>" tags
+  let price = getTagTextAfter "<span class=annPrix>" tags
+  let startUrl = T.pack "https://www.ouestfrance-immo.com/"
+  url <- getTagAttribute "<a>" (T.pack "href") tags
+  return (Ad name location price (T.concat [startUrl, url]))
diff --git a/src/parser/haskell/Parser/Utils.hs b/src/parser/haskell/Parser/Utils.hs
new file mode 100644
index 0000000..7c433c6
--- /dev/null
+++ b/src/parser/haskell/Parser/Utils.hs
@@ -0,0 +1,49 @@
+module Parser.Utils
+  ( getTagsBefore
+  , getTagsAfter
+  , getTagsBetween
+  , getTagAttributes
+  , getTagAttribute
+  , getTagTextAfter
+  ) where
+
+import           Data.List         (find, findIndex)
+import           Data.Maybe        (catMaybes, listToMaybe)
+import           Data.Text         (Text)
+import qualified Data.Text         as T
+
+import           Text.HTML.TagSoup
+
+getTagsBefore :: String -> [Tag Text] -> [Tag Text]
+getTagsBefore selector = takeWhile (~/= selector)
+
+getTagsAfter :: String -> [Tag Text] -> [Tag Text]
+getTagsAfter selector = drop 1 . dropWhile (~/= selector)
+
+getTagsBetween :: String -> String -> [Tag Text] -> [Tag Text]
+getTagsBetween begin end = getTagsBefore end . getTagsAfter begin
+
+getTagAttributes :: String -> Text -> [Tag Text] -> [Text]
+getTagAttributes selector attribute =
+  catMaybes
+  . fmap (maybeTagAttribute attribute)
+  . filter (~== selector)
+
+getTagAttribute :: String -> Text -> [Tag Text] -> Maybe Text
+getTagAttribute selector attribute =
+  listToMaybe
+  . getTagAttributes selector attribute
+
+getTagTextAfter :: String -> [Tag Text] -> Maybe Text
+getTagTextAfter selector tags =
+  case findIndex (~== selector) tags of
+    Just index -> fmap T.strip $ safeGetAt (index + 1) tags >>= maybeTagText
+    Nothing    -> Nothing
+
+maybeTagAttribute :: Text -> Tag Text -> Maybe Text
+maybeTagAttribute name (TagOpen _ xs) =
+  fmap snd . find (\(x, _) -> x == name) $ xs
+maybeTagAttribute _ _ = Nothing
+
+safeGetAt :: Int -> [a] -> Maybe a
+safeGetAt index = listToMaybe . drop index
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