88 lines
1.9 KiB
Lua
88 lines
1.9 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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--- 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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print("Can't parse value: ", value)
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end
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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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--- 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(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 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 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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