Add maxheight/maxwidth support into profiles

profiles/lib/measure.lua

@@ -0,0 +1,78 @@
+local Sequence = require('lib/sequence')
+
+Measure = {}
+
+-- measurements conversion constants
+local inch_to_meters = 0.0254
+local feet_to_inches = 12
+
+--- according to http://wiki.openstreetmap.org/wiki/Key:maxheight
+local meters_parse_patterns = Sequence {
+  "%d+",
+  "%d+.%d+",
+  "%d+.%d+ m",
+  "%d+,%d+ m", -- wrong
+  "%d+.%d+m",  -- wrong
+  "%d+,%d+m",  -- wrong
+}
+
+local feet_parse_patterns = Sequence {
+  "%d+\'%d+\'",
+}
+
+function Measure.convert_feet_to_inches(feet)
+  return feet * feet_to_inches
+end
+
+function Measure.convert_inches_to_meters(inches)
+  return inches * inch_to_meters
+end
+
+--- Parse string as a height in meters.
+function Measure.parse_value_meters(value)
+  -- try to parse meters
+  for i, templ in ipairs(meters_parse_patterns) do
+    m = string.match(value, templ)
+    if m then
+      return tonumber(m)
+    end
+  end
+
+  -- try to parse feets/inch
+  for i, templ in ipairs(feet_parse_patterns) do
+    m = string.match(value, templ)
+    if m then
+      feet, inch = m
+      feet = tonumber(feet)
+      inch = tonumber(inch)
+
+      inch = inch + feet * feet_to_inches
+      return Measure.convert_inches_to_meters(inch)
+    end
+  end
+
+  return
+end
+
+--- Get maxheight of specified way in meters. If there are no
+--- max height, then return nil
+function Measure.get_max_height(way)
+  raw_value = way:get_value_by_key('maxheight')
+  if raw_value then
+    return Measure.parse_value_meters(raw_value)
+  end
+
+  -- TODO: parse another tags
+end
+
+--- Get maxwidth of specified way in meters.
+function Measure.get_max_width(way)
+  raw_value = way:get_value_by_key('maxwidth')
+  if raw_value then
+    print(way:id(), raw_value)
+    return Measure.parse_value_meters(raw_value)
+  end
+end
+
+
+return Measure;