9307175333

Committed 30 May 2024 06:08PM UTC coverage: 70.644% (-3.5%) from 74.124%

Build # 9307175333

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Merge b18390e74 into 70ff5c335

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95.45

/types/length.lua

--- SILE length type.
-- Lengths are composed of 3 `measurement`s: a length, a stretch, and a shrink. Each part internally is just
-- a measurement, but combined describe a flexible length that is allowed to grow up to the amout defined by stretch or
-- compress up to the amount defined by shrink.
-- @types length

local function _error_if_not_number (a)
   if type(a) ~= "number" then
      SU.error("We tried to do impossible arithmetic on a " .. SU.type(a) .. ". (That's a bug)", true)
   end
end

--- @type length
local length = pl.class()
length.type = "length"

length.length = nil
length.stretch = nil
length.shrink = nil

--- Constructor.
-- @tparam measurement spec A measurement or value that can be cast to a measurement.
-- @tparam[opt=0] measurement stretch A measurement describing how much the length is allowed to grow.
-- @tparam[opt=0] measurement shrink A measurement describing how much the length is allowed to grow.
-- @treturn length
-- @usage
-- SILE.types.length("6em", "4pt", "2pt")
-- SILE.types.length("6em plus 4pt minus 2pt")
-- SILE.types.length(30, 4, 2)
function length:_init (spec, stretch, shrink)
   if stretch or shrink then
      self.length = SILE.types.measurement(spec or 0)
      self.stretch = SILE.types.measurement(stretch or 0)
      self.shrink = SILE.types.measurement(shrink or 0)
   elseif type(spec) == "number" then
      self.length = SILE.types.measurement(spec)
   elseif SU.type(spec) == "measurement" then
      self.length = spec
   elseif SU.type(spec) == "glue" then
      self.length = SILE.types.measurement(spec.width.length or 0)
      self.stretch = SILE.types.measurement(spec.width.stretch or 0)
      self.shrink = SILE.types.measurement(spec.width.shrink or 0)
   elseif type(spec) == "table" then
      self.length = SILE.types.measurement(spec.length or 0)
      self.stretch = SILE.types.measurement(spec.stretch or 0)
      self.shrink = SILE.types.measurement(spec.shrink or 0)
   elseif type(spec) == "string" then
      local amount = tonumber(spec)
      if type(amount) == "number" then
         self:_init(amount)
      else
         local parsed = SILE.parserBits.length:match(spec)
         if not parsed then
            SU.error("Could not parse length '" .. spec .. "'")
         end
         self:_init(parsed)
      end
   end
   if not self.length then
      self.length = SILE.types.measurement()
   end
   if not self.stretch then
      self.stretch = SILE.types.measurement()
   end
   if not self.shrink then
      self.shrink = SILE.types.measurement()
   end
end

function length:absolute ()
   return SILE.types.length(self.length:tonumber(), self.stretch:tonumber(), self.shrink:tonumber())
end

function length:negate ()
   return self:__unm()
end

function length:tostring ()
   return self:__tostring()
end

function length:tonumber ()
   return self.length:tonumber()
end

function length:__tostring ()
   local str = tostring(self.length)
   if self.stretch.amount ~= 0 then
      str = str .. " plus " .. tostring(self.stretch)
   end
   if self.shrink.amount ~= 0 then
      str = str .. " minus " .. tostring(self.shrink)
   end
   return str
end

function length:__add (other)
   if type(self) == "number" then
      self, other = other, self
   end
   other = SU.cast("length", other)
   return SILE.types.length(self.length + other.length, self.stretch + other.stretch, self.shrink + other.shrink)
end

-- See usage comments on SILE.types.measurement:___add()
function length:___add (other)
   if SU.type(other) ~= "length" then
      self.length:___add(other)
   else
      self.length:___add(other.length)
      self.stretch:___add(other.stretch)
      self.shrink:___add(other.shrink)
   end
   return nil
end

function length:__sub (other)
   local result = SILE.types.length(self)
   other = SU.cast("length", other)
   result.length = result.length - other.length
   result.stretch = result.stretch - other.stretch
   result.shrink = result.shrink - other.shrink
   return result
end

-- See usage comments on SILE.types.measurement:___add()
function length:___sub (other)
   self.length:___sub(other.length)
   self.stretch:___sub(other.stretch)
   self.shrink:___sub(other.shrink)
   return nil
end

function length:__mul (other)
   if type(self) == "number" then
      self, other = other, self
   end
   _error_if_not_number(other)
   local result = SILE.types.length(self)
   result.length = result.length * other
   result.stretch = result.stretch * other
   result.shrink = result.shrink * other
   return result
end

function length:__div (other)
   local result = SILE.types.length(self)
   _error_if_not_number(other)
   result.length = result.length / other
   result.stretch = result.stretch / other
   result.shrink = result.shrink / other
   return result
end

function length:__unm ()
   local result = SILE.types.length(self)
   result.length = result.length:__unm()
   return result
end

function length:__lt (other)
   local a = SU.cast("number", self)
   local b = SU.cast("number", other)
   return a - b < 0
end

function length:__le (other)
   local a = SU.cast("number", self)
   local b = SU.cast("number", other)
   return a - b <= 0
end

function length:__eq (other)
   local a = SU.cast("length", self)
   local b = SU.cast("length", other)
   return a.length == b.length and a.stretch == b.stretch and a.shrink == b.shrink
end

return length

1	--- SILE length type.
2	-- Lengths are composed of 3 `measurement`s: a length, a stretch, and a shrink. Each part internally is just
3	-- a measurement, but combined describe a flexible length that is allowed to grow up to the amout defined by stretch or
4	-- compress up to the amount defined by shrink.
5	-- @types length
6
7	local function _error_if_not_number (a)
8	if type(a) ~= "number" then	1,596✔
NEW 9	SU.error("We tried to do impossible arithmetic on a " .. SU.type(a) .. ". (That's a bug)", true)	×
10	end
11	end
12
13	--- @type length
14	local length = pl.class()	209✔
15	length.type = "length"	209✔
16
17	length.length = nil	209✔
18	length.stretch = nil	209✔
19	length.shrink = nil	209✔
20
21	--- Constructor.
22	-- @tparam measurement spec A measurement or value that can be cast to a measurement.
23	-- @tparam[opt=0] measurement stretch A measurement describing how much the length is allowed to grow.
24	-- @tparam[opt=0] measurement shrink A measurement describing how much the length is allowed to grow.
25	-- @treturn length
26	-- @usage
27	-- SILE.types.length("6em", "4pt", "2pt")
28	-- SILE.types.length("6em plus 4pt minus 2pt")
29	-- SILE.types.length(30, 4, 2)
30	function length:_init (spec, stretch, shrink)	209✔
31	if stretch or shrink then	283,507✔
32	self.length = SILE.types.measurement(spec or 0)	113,510✔
33	self.stretch = SILE.types.measurement(stretch or 0)	113,510✔
34	self.shrink = SILE.types.measurement(shrink or 0)	113,510✔
35	elseif type(spec) == "number" then	226,752✔
36	self.length = SILE.types.measurement(spec)	174,432✔
37	elseif SU.type(spec) == "measurement" then	279,072✔
38	self.length = spec	3,257✔
39	elseif SU.type(spec) == "glue" then	272,558✔
40	self.length = SILE.types.measurement(spec.width.length or 0)	58✔
41	self.stretch = SILE.types.measurement(spec.width.stretch or 0)	58✔
42	self.shrink = SILE.types.measurement(spec.width.shrink or 0)	58✔
43	elseif type(spec) == "table" then	136,250✔
44	self.length = SILE.types.measurement(spec.length or 0)	79,958✔
45	self.stretch = SILE.types.measurement(spec.stretch or 0)	79,958✔
46	self.shrink = SILE.types.measurement(spec.shrink or 0)	79,958✔
47	elseif type(spec) == "string" then	96,271✔
48	local amount = tonumber(spec)	2,343✔
49	if type(amount) == "number" then	2,343✔
50	self:_init(amount)	6✔
51	else
52	local parsed = SILE.parserBits.length:match(spec)	2,340✔
53	if not parsed then	2,340✔
NEW 54	SU.error("Could not parse length '" .. spec .. "'")	×
55	end
56	self:_init(parsed)	2,340✔
57	end
58	end
59	if not self.length then	283,507✔
60	self.length = SILE.types.measurement()	187,856✔
61	end
62	if not self.stretch then	283,507✔
63	self.stretch = SILE.types.measurement()	368,802✔
64	end
65	if not self.shrink then	283,507✔
66	self.shrink = SILE.types.measurement()	368,802✔
67	end
68	end
69
70	function length:absolute ()	209✔
71	return SILE.types.length(self.length:tonumber(), self.stretch:tonumber(), self.shrink:tonumber())	110,620✔
72	end
73
74	function length:negate ()	209✔
NEW 75	return self:__unm()	×
76	end
77
78	function length:tostring ()	209✔
NEW 79	return self:__tostring()	×
80	end
81
82	function length:tonumber ()	209✔
83	return self.length:tonumber()	210,866✔
84	end
85
86	function length:__tostring ()	209✔
87	local str = tostring(self.length)	32✔
88	if self.stretch.amount ~= 0 then	32✔
89	str = str .. " plus " .. tostring(self.stretch)	44✔
90	end
91	if self.shrink.amount ~= 0 then	32✔
NEW 92	str = str .. " minus " .. tostring(self.shrink)	×
93	end
94	return str	32✔
95	end
96
97	function length:__add (other)	209✔
98	if type(self) == "number" then	23,681✔
99	self, other = other, self	11,197✔
100	end
101	other = SU.cast("length", other)	47,362✔
102	return SILE.types.length(self.length + other.length, self.stretch + other.stretch, self.shrink + other.shrink)	94,724✔
103	end
104
105	-- See usage comments on SILE.types.measurement:___add()
106	function length:___add (other)	209✔
107	if SU.type(other) ~= "length" then	164,636✔
108	self.length:___add(other)	9,738✔
109	else
110	self.length:___add(other.length)	77,449✔
111	self.stretch:___add(other.stretch)	77,449✔
112	self.shrink:___add(other.shrink)	77,449✔
113	end
114	return nil	82,318✔
115	end
116
117	function length:__sub (other)	209✔
118	local result = SILE.types.length(self)	22,013✔
119	other = SU.cast("length", other)	44,026✔
120	result.length = result.length - other.length	44,026✔
121	result.stretch = result.stretch - other.stretch	44,026✔
122	result.shrink = result.shrink - other.shrink	44,026✔
123	return result	22,013✔
124	end
125
126	-- See usage comments on SILE.types.measurement:___add()
127	function length:___sub (other)	209✔
128	self.length:___sub(other.length)	5,128✔
129	self.stretch:___sub(other.stretch)	5,128✔
130	self.shrink:___sub(other.shrink)	5,128✔
131	return nil	5,128✔
132	end
133
134	function length:__mul (other)	209✔
135	if type(self) == "number" then	1,397✔
136	self, other = other, self	6✔
137	end
138	_error_if_not_number(other)	1,397✔
139	local result = SILE.types.length(self)	1,397✔
140	result.length = result.length * other	2,794✔
141	result.stretch = result.stretch * other	2,794✔
142	result.shrink = result.shrink * other	2,794✔
143	return result	1,397✔
144	end
145
146	function length:__div (other)	209✔
147	local result = SILE.types.length(self)	199✔
148	_error_if_not_number(other)	199✔
149	result.length = result.length / other	398✔
150	result.stretch = result.stretch / other	398✔
151	result.shrink = result.shrink / other	398✔
152	return result	199✔
153	end
154
155	function length:__unm ()	209✔
156	local result = SILE.types.length(self)	64✔
157	result.length = result.length:__unm()	128✔
158	return result	64✔
159	end
160
161	function length:__lt (other)	209✔
162	local a = SU.cast("number", self)	63,804✔
163	local b = SU.cast("number", other)	63,804✔
164	return a - b < 0	63,804✔
165	end
166
167	function length:__le (other)	209✔
168	local a = SU.cast("number", self)	26✔
169	local b = SU.cast("number", other)	26✔
170	return a - b <= 0	26✔
171	end
172
173	function length:__eq (other)	209✔
174	local a = SU.cast("length", self)	6✔
175	local b = SU.cast("length", other)	6✔
176	return a.length == b.length and a.stretch == b.stretch and a.shrink == b.shrink	24✔
177	end
178
179	return length	209✔

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