121 lines
2.6 KiB
Lua
121 lines
2.6 KiB
Lua
local Sequence = require('lib/sequence')
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Measure = {}
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-- measurements conversion constants
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local inch_to_meters = 0.0254
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local feet_to_inches = 12
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--- according to http://wiki.openstreetmap.org/wiki/Key:maxheight
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local meters_parse_patterns = Sequence {
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"%d+",
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"%d+.%d+",
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"%d+.%d+ m",
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"%d+,%d+ m", -- wrong
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"%d+.%d+m", -- wrong
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"%d+,%d+m", -- wrong
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}
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local feet_parse_patterns = Sequence {
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"%d+\'%d+\'",
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}
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--- according to http://wiki.openstreetmap.org/wiki/Map_Features/Units#Explicit_specifications
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local tonns_parse_patterns = Sequence {
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"%d+",
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"%d+.%d+",
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"%d+.%d+ t"
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}
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local kg_parse_patterns = Sequence {
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"%d+ kg"
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}
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function Measure.convert_feet_to_inches(feet)
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return feet * feet_to_inches
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end
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function Measure.convert_inches_to_meters(inches)
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return inches * inch_to_meters
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end
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--- Parse string as a height in meters.
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function Measure.parse_value_meters(value)
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-- try to parse meters
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for i, templ in ipairs(meters_parse_patterns) do
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m = string.match(value, templ)
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if m then
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return tonumber(m)
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end
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end
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-- try to parse feets/inch
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for i, templ in ipairs(feet_parse_patterns) do
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m = string.match(value, templ)
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if m then
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feet, inch = m
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feet = tonumber(feet)
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inch = tonumber(inch)
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inch = inch + feet * feet_to_inches
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return Measure.convert_inches_to_meters(inch)
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end
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end
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print("Can't parse value: ", value)
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return
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end
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--- Parse weight value in kilograms
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function Measure.parse_value_kilograms(value)
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-- try to parse kilograms
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for i, templ in ipairs(kg_parse_patterns) do
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m = string.match(value, templ)
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if m then
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return tonumber(m)
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end
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end
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-- try to parse tonns
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for i, templ in ipairs(tonns_parse_patterns) do
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m = string.match(value, templ)
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if m then
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return tonumber(m) * 1000
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end
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end
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--
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print("Can't parse value: ", value)
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return
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end
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--- Get maxheight of specified way in meters. If there are no
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--- max height, then return nil
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function Measure.get_max_height(way)
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raw_value = way:get_value_by_key('maxheight')
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if raw_value then
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return Measure.parse_value_meters(raw_value)
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end
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-- TODO: parse another tags
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end
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--- Get maxwidth of specified way in meters.
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function Measure.get_max_width(way)
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raw_value = way:get_value_by_key('maxwidth')
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if raw_value then
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return Measure.parse_value_meters(raw_value)
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end
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end
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--- Get maxweight of specified way in kilogramms
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function Measure.get_max_weight(way)
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raw_value = way:get_value_by_key('maxweight')
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if raw_value then
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-- print(way:id(), raw_value)
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return Measure.parse_value_kilograms(raw_value)
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end
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end
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return Measure; |