diff options
| -rw-r--r-- | lualibs-util-dim.lua | 211 |
1 files changed, 113 insertions, 98 deletions
diff --git a/lualibs-util-dim.lua b/lualibs-util-dim.lua index da5ab14..d77bd49 100644 --- a/lualibs-util-dim.lua +++ b/lualibs-util-dim.lua @@ -16,14 +16,20 @@ table.</p> --ldx]]-- local format, match, gsub, type, setmetatable = string.format, string.match, string.gsub, type, setmetatable -local P, S, R, Cc, lpegmatch = lpeg.P, lpeg.S, lpeg.R, lpeg.Cc, lpeg.match +local P, S, R, Cc, C, lpegmatch = lpeg.P, lpeg.S, lpeg.R, lpeg.Cc, lpeg.C, lpeg.match + +local allocate = utilities.storage.allocate +local setmetatableindex = table.setmetatableindex + +--this might become another namespace number = number or { } +local number = number number.tonumberf = function(n) return match(format("%.20f",n),"(.-0?)0*$") end -- one zero too much but alas number.tonumberg = function(n) return format("%.20g",n) end -local dimenfactors = { +local dimenfactors = allocate { ["pt"] = 1/65536, ["in"] = ( 100/ 7227)/65536, ["cm"] = ( 254/ 7227)/65536, @@ -80,14 +86,17 @@ local dimenfactors = { format (string) is implemented using this table.</p> --ldx]]-- --- was: - -local function todimen(n,unit,fmt) +local function numbertodimen(n,unit,fmt) if type(n) == 'string' then return n else unit = unit or 'pt' - return format(fmt or "%s%s",n*dimenfactors[unit],unit) + if not fmt then + fmt = "%s%s" + elseif fmt == true then + fmt = "%0.5f%s" + end + return format(fmt,n*dimenfactors[unit],unit) -- if fmt then -- return format(fmt,n*dimenfactors[unit],unit) -- else @@ -101,21 +110,21 @@ end --ldx]]-- number.maxdimen = 1073741823 -number.todimen = todimen +number.todimen = numbertodimen number.dimenfactors = dimenfactors -function number.topoints (n) return todimen(n,"pt") end -function number.toinches (n) return todimen(n,"in") end -function number.tocentimeters (n) return todimen(n,"cm") end -function number.tomillimeters (n) return todimen(n,"mm") end -function number.toscaledpoints(n) return todimen(n,"sp") end -function number.toscaledpoints(n) return n .. "sp" end -function number.tobasepoints (n) return todimen(n,"bp") end -function number.topicas (n) return todimen(n "pc") end -function number.todidots (n) return todimen(n,"dd") end -function number.tociceros (n) return todimen(n,"cc") end -function number.tonewdidots (n) return todimen(n,"nd") end -function number.tonewciceros (n) return todimen(n,"nc") end +function number.topoints (n,fmt) return numbertodimen(n,"pt",fmt) end +function number.toinches (n,fmt) return numbertodimen(n,"in",fmt) end +function number.tocentimeters (n,fmt) return numbertodimen(n,"cm",fmt) end +function number.tomillimeters (n,fmt) return numbertodimen(n,"mm",fmt) end +function number.toscaledpoints(n,fmt) return numbertodimen(n,"sp",fmt) end +function number.toscaledpoints(n) return n .. "sp" end +function number.tobasepoints (n,fmt) return numbertodimen(n,"bp",fmt) end +function number.topicas (n,fmt) return numbertodimen(n "pc",fmt) end +function number.todidots (n,fmt) return numbertodimen(n,"dd",fmt) end +function number.tociceros (n,fmt) return numbertodimen(n,"cc",fmt) end +function number.tonewdidots (n,fmt) return numbertodimen(n,"nd",fmt) end +function number.tonewciceros (n,fmt) return numbertodimen(n,"nc",fmt) end --[[ldx-- <p>More interesting it to implement a (sort of) dimen datatype, one @@ -132,27 +141,40 @@ local dimenpair = amount/tonumber * (unit^1/dimenfactors + Cc(1)) -- tonumber is lpeg.patterns.dimenpair = dimenpair +local splitter = amount/tonumber * C(unit^1) + +function number.splitdimen(str) + return lpegmatch(splitter,str) +end + --[[ldx-- <p>We use a metatable to intercept errors. When no key is found in the table with factors, the metatable will be consulted for an alternative index function.</p> --ldx]]-- -local mt = { } setmetatable(dimenfactors,mt) - -mt.__index = function(t,s) +setmetatableindex(dimenfactors, function(t,s) -- error("wrong dimension: " .. (s or "?")) -- better a message return false -end +end) -function string:todimen() - if type(self) == "number" then - return self - else - local value, unit = lpegmatch(dimenpair,self) - return value/unit - end -end +--[[ldx-- +<p>We redefine the following function later on, so we comment it +here (which saves us bytecodes.</p> +--ldx]]-- + +-- function string.todimen(str) +-- if type(str) == "number" then +-- return str +-- else +-- local value, unit = lpegmatch(dimenpair,str) +-- return value/unit +-- end +-- end +-- +-- local stringtodimen = string.todimen + +local stringtodimen -- assigned later (commenting saves bytecode) local amount = S("+-")^0 * R("09")^0 * S(".,")^0 * R("09")^0 local unit = P("pt") + P("cm") + P("mm") + P("sp") + P("bp") + P("in") + @@ -160,7 +182,7 @@ local unit = P("pt") + P("cm") + P("mm") + P("sp") + P("bp") + P("in") + local validdimen = amount * unit -lpeg.patterns.validdimen = pattern +lpeg.patterns.validdimen = validdimen --[[ldx-- <p>This converter accepts calls like:</p> @@ -174,12 +196,6 @@ string.todimen("10pt") string.todimen("10.0pt") </typing> -<p>And of course the often more efficient:</p> - -<typing> -somestring:todimen("12.3cm") -</typing> - <p>With this in place, we can now implement a proper datatype for dimensions, one that permits us to do this:</p> @@ -197,28 +213,28 @@ local dimensions = { } <p>The main (and globally) visible representation of a dimen is defined next: it is a one-element table. The unit that is returned from the match is normally a number (one of the previously defined factors) but we also accept functions. Later we will -see why.</p> +see why. This function is redefined later.</p> --ldx]]-- -function dimen(a) - if a then - local ta= type(a) - if ta == "string" then - local value, unit = lpegmatch(pattern,a) - if type(unit) == "function" then - k = value/unit() - else - k = value/unit - end - a = k - elseif ta == "table" then - a = a[1] - end - return setmetatable({ a }, dimensions) - else - return setmetatable({ 0 }, dimensions) - end -end +-- function dimen(a) +-- if a then +-- local ta= type(a) +-- if ta == "string" then +-- local value, unit = lpegmatch(pattern,a) +-- if type(unit) == "function" then +-- k = value/unit() +-- else +-- k = value/unit +-- end +-- a = k +-- elseif ta == "table" then +-- a = a[1] +-- end +-- return setmetatable({ a }, dimensions) +-- else +-- return setmetatable({ 0 }, dimensions) +-- end +-- end --[[ldx-- <p>This function return a small hash with a metatable attached. It is @@ -228,35 +244,35 @@ shared some of the code but for reasons of speed we don't.</p> function dimensions.__add(a, b) local ta, tb = type(a), type(b) - if ta == "string" then a = a:todimen() elseif ta == "table" then a = a[1] end - if tb == "string" then b = b:todimen() elseif tb == "table" then b = b[1] end + if ta == "string" then a = stringtodimen(a) elseif ta == "table" then a = a[1] end + if tb == "string" then b = stringtodimen(b) elseif tb == "table" then b = b[1] end return setmetatable({ a + b }, dimensions) end function dimensions.__sub(a, b) local ta, tb = type(a), type(b) - if ta == "string" then a = a:todimen() elseif ta == "table" then a = a[1] end - if tb == "string" then b = b:todimen() elseif tb == "table" then b = b[1] end + if ta == "string" then a = stringtodimen(a) elseif ta == "table" then a = a[1] end + if tb == "string" then b = stringtodimen(b) elseif tb == "table" then b = b[1] end return setmetatable({ a - b }, dimensions) end function dimensions.__mul(a, b) local ta, tb = type(a), type(b) - if ta == "string" then a = a:todimen() elseif ta == "table" then a = a[1] end - if tb == "string" then b = b:todimen() elseif tb == "table" then b = b[1] end + if ta == "string" then a = stringtodimen(a) elseif ta == "table" then a = a[1] end + if tb == "string" then b = stringtodimen(b) elseif tb == "table" then b = b[1] end return setmetatable({ a * b }, dimensions) end function dimensions.__div(a, b) local ta, tb = type(a), type(b) - if ta == "string" then a = a:todimen() elseif ta == "table" then a = a[1] end - if tb == "string" then b = b:todimen() elseif tb == "table" then b = b[1] end + if ta == "string" then a = stringtodimen(a) elseif ta == "table" then a = a[1] end + if tb == "string" then b = stringtodimen(b) elseif tb == "table" then b = b[1] end return setmetatable({ a / b }, dimensions) end function dimensions.__unm(a) local ta = type(a) - if ta == "string" then a = a:todimen() elseif ta == "table" then a = a[1] end + if ta == "string" then a = stringtodimen(a) elseif ta == "table" then a = a[1] end return setmetatable({ - a }, dimensions) end @@ -321,23 +337,9 @@ is loaded, the relevant tables that hold the functions needed may not yet be available.</p> --ldx]]-- -function dimensions.texify() -- todo: % - local fti, fc = fonts and fonts.ids and fonts.ids, font and font.current - if fti and fc then - dimenfactors["ex"] = function() return fti[fc()].ex_height end - dimenfactors["em"] = function() return fti[fc()].quad end - else - dimenfactors["ex"] = 1/65536* 4 -- 4pt - dimenfactors["em"] = 1/65536*10 -- 10pt - end -end - ---[[ldx-- -<p>In order to set the defaults we call this function now. At some point -the macro package needs to make sure the function is called again.</p> ---ldx]]-- - -dimensions.texify() + dimenfactors["ex"] = 4 * 1/65536 -- 4pt + dimenfactors["em"] = 10 * 1/65536 -- 10pt +-- dimenfactors["%"] = 4 * 1/65536 -- 400pt/100 --[[ldx-- <p>The previous code is rather efficient (also thanks to <l n='lpeg'/>) but we @@ -389,27 +391,40 @@ function dimen(a) end end -function string:todimen() - if type(self) == "number" then - return self +function string.todimen(str) -- maybe use tex.sp when available + if type(str) == "number" then + return str else - local k = known[self] + local k = known[str] if not k then - local value, unit = lpegmatch(dimenpair,self) + local value, unit = lpegmatch(dimenpair,str) if value and unit then - k = value/unit + k = value/unit -- to be considered: round else k = 0 end - -- print(self,value,unit) - known[self] = k + -- print(str,value,unit) + known[str] = k end return k end end +--~ local known = { } + +--~ function string.todimen(str) -- maybe use tex.sp +--~ local k = known[str] +--~ if not k then +--~ k = tex.sp(str) +--~ known[str] = k +--~ end +--~ return k +--~ end + +stringtodimen = string.todimen -- local variable defined earlier + function number.toscaled(d) - return format("0.5f",d/2^16) + return format("%0.5f",d/2^16) end --[[ldx-- @@ -421,12 +436,12 @@ probably use a hash instead of a one-element table.</p> <p>Goodie:s</p> --ldx]]-- -function number.percent(n) -- will be cleaned up once luatex 0.30 is out - local hsize = tex.hsize - if type(hsize) == "string" then - hsize = hsize:todimen() +function number.percent(n,d) -- will be cleaned up once luatex 0.30 is out + d = d or tex.hsize + if type(d) == "string" then + d = stringtodimen(d) end - return (n/100) * hsize + return (n/100) * d end number["%"] = number.percent |