Implement parsing of 4/ group (snowdepth)

akrherz · akrherz · commit 84fe8253742f · 2017-07-18T10:45:47.000-05:00
diff --git a/metar/Metar.py b/metar/Metar.py
@@ -175,6 +175,7 @@ class ParserError(Exception):
                                            [NSEW][EW]? (-[NSEW][EW]?)* )+))?
                                           ( \s+MOV\s+(?P<dir>[NSEW][EW]?) )?\s+""",
                            re.VERBOSE)
+SNOWDEPTH_RE = re.compile(r"""^4/(?P<snowdepth>\d\d\d)\s+""")
 
 ## translation of weather location codes
 
@@ -342,6 +343,7 @@ def __init__( self, metarcode, month=None, year=None, utcdelta=None):
       self.precip_3hr = None             # precipitation over the last 3 hours
       self.precip_6hr = None             # precipitation over the last 6 hours
       self.precip_24hr = None            # precipitation over the last 24 hours
+      self.snowdepth = None              # snow depth (distance)
       self._trend = False                # trend groups present (bool)
       self._trend_groups = []            # trend forecast groups
       self._remarks = []                 # remarks (list of strings)
@@ -879,6 +881,13 @@ def _handleAutoRemark( self, d ):
           self._remarks.append("Automated station")
       elif d['type'] == "2":
           self._remarks.append("Automated station (type 2)")
+
+  def _handleSnowDepthRemark(self, d):
+      """
+      Parse the 4/ group snowdepth report
+      """
+      self.snowdepth = distance(float(d['snowdepth']), 'IN')
+      self._remarks.append(" snowdepth %s" % (self.snowdepth, ))
       
   def _unparsedRemark( self, d ):
       """
@@ -928,6 +937,7 @@ def _unparsedRemark( self, d ):
                       (PRESS_3HR_RE,    _handlePress3hrRemark),
                       (TEMP_6HR_RE,     _handleTemp6hrRemark),
                       (TEMP_24HR_RE,    _handleTemp24hrRemark),
+                      (SNOWDEPTH_RE,    _handleSnowDepthRemark),
                       (UNPARSED_RE,     _unparsedRemark) ]
   
   ## functions that return text representations of conditions for output
diff --git a/test/test_metar.py b/test/test_metar.py
@@ -412,6 +412,15 @@ def report(trend_group, remarks=""):
     self.assertEqual( report('TEMPO 0306 RMK 402500072').trend(), 'TEMPO 0306' )
     self.assertEqual( report('TEMPO 0306 RMK 402500072').max_temp_24hr.value(), 25.0 )
 
+  def test_snowdepth(self):
+    """Check parsing of 4/ group snowdepth"""
+    sample_metar = ("KDOV 040558Z 23004KT 1 1/2SM R01/2800FT -SN BR "
+                    "OVC006 M01/M01 A3015 RMK AO2A SLP213 P0000 4/001 "
+                    "60010 T10071007 10017 "
+                    "21009 55016 VISNO RWY19 CHINO RWY19 $")
+    m = Metar.Metar(sample_metar)
+    self.assertEquals(m.snowdepth.value(), 1)
+
   def test_310_parse_sky_conditions(self):
     """Check parsing of sky conditions"""
 
