diff options
Diffstat (limited to 'tex/context/base/math-act.lua')
| -rw-r--r-- | tex/context/base/math-act.lua | 142 |
1 files changed, 142 insertions, 0 deletions
diff --git a/tex/context/base/math-act.lua b/tex/context/base/math-act.lua new file mode 100644 index 000000000..03675933e --- /dev/null +++ b/tex/context/base/math-act.lua @@ -0,0 +1,142 @@ +if not modules then modules = { } end modules ['math-act'] = { + version = 1.001, + comment = "companion to math-ini.mkiv", + author = "Hans Hagen, PRAGMA-ADE, Hasselt NL", + copyright = "PRAGMA ADE / ConTeXt Development Team", + license = "see context related readme files" +} + +local trace_defining = false trackers.register("math.defining", function(v) trace_defining = v end) +local report_math = logs.reporter("mathematics","initializing") + +local mathematics = mathematics + +local sequencers = utilities.sequencers +local appendgroup = sequencers.appendgroup +local appendaction = sequencers.appendaction +local mathprocessor = nil + +local mathactions = sequencers.reset { + arguments = "target,original", +} + +function fonts.constructors.assignmathparameters(original,target) + if mathactions.dirty then -- maybe use autocompile + mathprocessor = sequencers.compile(mathactions) + end + mathprocessor(original,target) +end + +appendgroup(mathactions,"before") -- user +appendgroup(mathactions,"system") -- private +appendgroup(mathactions,"after" ) -- user + +function mathematics.initializeparameters(target,original) + local mathparameters = original.mathparameters + if mathparameters and next(mathparameters) then + target.mathparameters = mathematics.dimensions(mathparameters) + end +end + +sequencers.appendaction(mathactions,"system","mathematics.initializeparameters") + +local how = { + -- RadicalKernBeforeDegree = "horizontal", + -- RadicalKernAfterDegree = "horizontal", + RadicalDegreeBottomRaisePercent = "unscaled" +} + +function mathematics.scaleparameters(target,original) + if not target.properties.math_is_scaled then + local mathparameters = target.mathparameters + if mathparameters and next(mathparameters) then + local parameters = target.parameters + local factor = parameters.factor + local hfactor = parameters.hfactor + local vfactor = parameters.vfactor + for name, value in next, mathparameters do + local h = how[name] + if h == "unscaled" then + mathparameters[name] = value + elseif h == "horizontal" then + mathparameters[name] = value * hfactor + elseif h == "vertical"then + mathparameters[name] = value * vfactor + else + mathparameters[name] = value * factor + end + end + end + target.properties.math_is_scaled = true + end +end + +sequencers.appendaction(mathactions,"system","mathematics.scaleparameters") + +function mathematics.checkaccentbaseheight(target,original) + local mathparameters = target.mathparameters + if mathparameters then + mathparameters.AccentBaseHeight = nil -- safeguard + end +end + +sequencers.appendaction(mathactions,"system","mathematics.checkaccentbaseheight") + +function mathematics.checkprivateparameters(target,original) + local mathparameters = target.mathparameters + if mathparameters then + if not mathparameters.FractionDelimiterSize then + mathparameters.FractionDelimiterSize = 0 + end + if not mathparameters.FractionDelimiterDisplayStyleSize then + mathparameters.FractionDelimiterDisplayStyleSize = 0 + end + end +end + +sequencers.appendaction(mathactions,"system","mathematics.checkprivateparameters") + +function mathematics.overloadparameters(target,original) + local mathparameters = target.mathparameters + if mathparameters and next(mathparameters) then + local goodies = target.goodies + if goodies then + for i=1,#goodies do + local goodie = goodies[i] + local mathematics = goodie.mathematics + local parameters = mathematics and mathematics.parameters + if parameters then + if trace_defining then + report_math("overloading math parameters in '%s' @ %s",target.properties.fullname,target.parameters.size) + end + for name, value in next, parameters do + local tvalue = type(value) + if tvalue == "string" then + report_math("comment for math parameter '%s': %s",name,value) + else + local oldvalue = mathparameters[name] + local newvalue = oldvalue + if oldvalue then + if tvalue == "number" then + newvalue = value + elseif tvalue == "function" then + newvalue = value(oldvalue,target,original) + elseif not tvalue then + newvalue = nil + end + if trace_defining and oldvalue ~= newvalue then + report_math("overloading math parameter '%s': %s => %s",name,tostring(oldvalue),tostring(newvalue)) + end + else + report_math("invalid math parameter '%s'",name) + end + mathparameters[name] = newvalue + end + end + end + end + end + end +end + +sequencers.appendaction(mathactions,"system","mathematics.overloadparameters") |