108 lines
2.9 KiB
Lua
108 lines
2.9 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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local pound_to_kilograms = 0.45359237
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local miles_to_kilometers = 1.609
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-- Parse speed value as kilometers by hours.
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function Measure.parse_value_speed(source)
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local n = tonumber(source:match("%d*"))
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if n then
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if string.match(source, "mph") or string.match(source, "mp/h") then
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n = n * miles_to_kilometers
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end
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return n
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end
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end
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--- Parse string as a height in meters.
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--- according to http://wiki.openstreetmap.org/wiki/Key:maxheight
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function Measure.parse_value_meters(value)
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local n = tonumber(value:gsub(",", "."):match("%d+%.?%d*"))
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if n then
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inches = value:match("'.*")
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if inches then -- Imperial unit to metric
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-- try to parse feets/inch
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n = n * feet_to_inches
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local m = tonumber(inches:match("%d+"))
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if m then
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n = n + m
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end
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n = n * inch_to_meters
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end
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return n
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end
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end
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--- Parse weight value in kilograms.
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--- according to https://wiki.openstreetmap.org/wiki/Key:maxweight
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function Measure.parse_value_kilograms(value)
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local n = tonumber(value:gsub(",", "."):match("%d+%.?%d*"))
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if n then
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if string.match(value, "lbs") then
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n = n * pound_to_kilograms
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elseif string.match(value, "kg") then
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-- n = n
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else -- Default, metric tons
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n = n * 1000
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end
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return n
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end
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end
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--- Get maxspeed of specified way in kilometers by hours.
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function Measure.get_max_speed(raw_value)
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if raw_value then
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return Measure.parse_value_speed(raw_value)
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end
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end
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-- default maxheight value defined in https://wiki.openstreetmap.org/wiki/Key:maxheight#Non-numerical_values
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local default_maxheight = 4.5
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-- Available Non numerical values equal to 4.5; below_default and no_indications are not considered
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local height_non_numerical_values = Set { "default", "none", "no-sign", "unsigned" }
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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(raw_value, element)
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if raw_value then
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if height_non_numerical_values[raw_value] then
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if element then
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return element:get_location_tag('maxheight') or default_maxheight
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else
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return default_maxheight
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end
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else
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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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end
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--- Get maxwidth of specified way in meters.
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function Measure.get_max_width(raw_value)
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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 maxlength of specified way in meters.
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function Measure.get_max_length(raw_value)
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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(raw_value)
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if raw_value then
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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;
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