186 lines
6.5 KiB
Text
186 lines
6.5 KiB
Text
import [AnyCv] from "../support/gr"
|
|
import 'toposort' as toposort
|
|
|
|
export : define [CreateEmptyTable] {.languages {.} .features {.} .lookups {.} .lookupDep {}}
|
|
extern Map
|
|
extern Set
|
|
|
|
export : define [pick-language sink tag] : begin
|
|
if sink.languages.(tag) : return sink.languages.(tag)
|
|
define lang {.features {}}
|
|
set sink.languages.(tag) lang
|
|
return lang
|
|
|
|
export : define [copy-language sink tag tagFrom] : begin
|
|
define langFrom : pick-language sink tagFrom
|
|
define langTo : pick-language sink tag
|
|
foreach [feat : items-of langFrom.features] : langTo.features.push feat
|
|
return langTo
|
|
|
|
export : define [add-lang-feature lang fea] : begin
|
|
define index : lang.features.indexOf fea.name
|
|
if (index < 0) : lang.features.push fea.name
|
|
|
|
export : define [add-feature sink tag] : begin
|
|
define lookupArray {}
|
|
local n 0
|
|
while true : begin
|
|
if [not sink.features.(tag + '_' + n)] : begin
|
|
set sink.features.(tag + '_' + n) lookupArray
|
|
return {.name (tag + '_' + n) .lookups lookupArray}
|
|
set n : n + 1
|
|
|
|
export : define [pick-feature sink name] : begin
|
|
if sink.features.(name) : return { .name name .lookups sink.features.(name) }
|
|
define featObj { .name name .lookups {} }
|
|
set sink.features.(name) featObj.lookups
|
|
return featObj
|
|
|
|
export : define [add-feature-lookup fea lookupName] : begin
|
|
define index : fea.lookups.indexOf lookupName
|
|
if (index < 0) : fea.lookups.push lookupName
|
|
|
|
export : define [add-lookup sink data _prefix] : begin
|
|
local prefix : _prefix || '_lut_'
|
|
local n 0
|
|
while true : begin
|
|
if [not sink.lookups.(prefix + n)] : begin
|
|
set sink.lookups.(prefix + n) data
|
|
return (prefix + n)
|
|
set n : n + 1
|
|
|
|
export : define [pick-lookup sink name fallback] : begin
|
|
if sink.lookups.(name) : return sink.lookups.(name)
|
|
set sink.lookups.(name) fallback
|
|
return sink.lookups.(name)
|
|
|
|
export : define [add-common-feature sink fea] : begin
|
|
define dfltDflt : pick-language sink 'DFLT_DFLT'
|
|
define latnDflt : pick-language sink 'latn_DFLT'
|
|
define grekDflt : pick-language sink 'grek_DFLT'
|
|
define cyrlDflt : pick-language sink 'cyrl_DFLT'
|
|
|
|
add-lang-feature dfltDflt fea
|
|
add-lang-feature latnDflt fea
|
|
add-lang-feature grekDflt fea
|
|
add-lang-feature cyrlDflt fea
|
|
|
|
return fea
|
|
|
|
define UtilityLookupPrefix '.utility-single.'
|
|
|
|
export : define [BeginLookupBlock sink] : begin
|
|
return : object
|
|
existingLookupNames : new Set : Object.keys sink.lookups
|
|
|
|
define [IsUtilityLookupId name] : [name.slice 0 UtilityLookupPrefix.length] === UtilityLookupPrefix
|
|
|
|
export : define [EndLookupBlock rec sink] : begin
|
|
local currentLookupNames : new Set : Object.keys sink.lookups
|
|
foreach existing rec.existingLookupNames : foreach current currentLookupNames
|
|
if (![IsUtilityLookupId existing] && ![IsUtilityLookupId current] && ![rec.existingLookupNames.has current])
|
|
sink.lookupDep.push { existing current }
|
|
|
|
set EndLookupBlock.Front : lambda [rec sink] : begin
|
|
local currentLookupNames : new Set : Object.keys sink.lookups
|
|
foreach existing rec.existingLookupNames : foreach current currentLookupNames
|
|
if (![IsUtilityLookupId existing] && ![IsUtilityLookupId current] && ![rec.existingLookupNames.has current])
|
|
sink.lookupDep.push { current existing }
|
|
|
|
export : define [MoveBackUtilityLookups sink] : begin
|
|
local lns : new Set : Object.keys sink.lookups
|
|
foreach [front lns] : foreach [rear lns]
|
|
if (![IsUtilityLookupId front] && [IsUtilityLookupId rear])
|
|
sink.lookupDep.push { front rear }
|
|
|
|
export : define [ChainRuleBuilder sink] : begin
|
|
define [createNewLookup f t] : begin
|
|
local subst {.}
|
|
foreach [j : range 0 f.length] : set subst.(f.(j)) t.(j)
|
|
return : add-lookup sink {.type 'gsub_single' .substitutions subst} UtilityLookupPrefix
|
|
|
|
define [getSubLookup left right] : piecewise
|
|
[not right] null
|
|
([typeof right] === "string") right
|
|
(right <@ Function) : getSubLookup left [right left]
|
|
true : begin
|
|
local found null
|
|
local maxMatch 0
|
|
local lookupKeys : [Object.keys sink.lookups].reverse
|
|
foreach [name : items-of lookupKeys] : begin
|
|
local st sink.lookups.(name).substitutions
|
|
if [IsUtilityLookupId name] : begin
|
|
local compatible true
|
|
local matchCount 0
|
|
foreach [j : range 0 left.length] : begin
|
|
if (st.(left.(j)) && st.(left.(j)) !== right.(j)) : set compatible false
|
|
if (st.(left.(j)) === right.(j)) : inc matchCount
|
|
if (compatible && (!found || matchCount > maxMatch)) : begin
|
|
set found name
|
|
set maxMatch matchCount
|
|
|
|
if found : begin
|
|
local st sink.lookups.(found).substitutions
|
|
foreach [j : range 0 left.length] : set st.(left.(j)) right.(j)
|
|
return found
|
|
|
|
return : createNewLookup left right
|
|
|
|
define [chain-rule] : begin
|
|
local terms : [{}.slice.call arguments 0].map (x -> [if x.left x {.left x .right null}])
|
|
local rule {.match {} .apply {} .inputBegins 0 .inputEnds 0}
|
|
local foundi false
|
|
local founde false
|
|
foreach [j : range 0 terms.length] : if (!foundi && terms.(j).right) : begin
|
|
set rule.inputBegins j
|
|
set foundi true
|
|
foreach [j : range (terms.length - 1) downtill 0] : if (!founde && terms.(j).right) : begin
|
|
set rule.inputEnds (j + 1)
|
|
set founde true
|
|
foreach [j : range 0 terms.length] : begin
|
|
local term terms.(j)
|
|
rule.match.push : Array.from : new Set term.left
|
|
local lutn : getSubLookup term.left term.right
|
|
if lutn : rule.apply.push {.at j .lookup lutn}
|
|
return rule
|
|
|
|
define [reverse-rule] : begin
|
|
local terms : [{}.slice.call arguments 0].map (x -> [if x.left x {.left x .right null}])
|
|
local rule {.match {} .to {} .inputIndex 0}
|
|
local foundi false
|
|
|
|
foreach [j : range 0 terms.length] : begin
|
|
local term terms.(j)
|
|
local subst : new Map
|
|
foreach [g : items-of term.left] : subst.set g g
|
|
|
|
if term.right : begin
|
|
if foundi : throw : new Error "Duplicate substitutions in one reverse rule"
|
|
set foundi true
|
|
set rule.inputIndex j
|
|
local toGlyphs : piecewise
|
|
(term.right <@ Function) [term.right term.left]
|
|
true term.right
|
|
foreach [k : range 0 term.left.length]
|
|
subst.set term.left.(k) (toGlyphs.(k) || term.left.(k))
|
|
|
|
set rule.to : Array.from [subst.values]
|
|
|
|
set rule.match.(j) : Array.from [subst.keys]
|
|
|
|
return rule
|
|
|
|
return {chain-rule reverse-rule}
|
|
|
|
export : define [query-related-glyphs glyphs para entries] : begin
|
|
define sink {}
|
|
foreach [gid : items-of entries] : if glyphs.(gid) : begin
|
|
sink.push gid
|
|
if para.enableCvSs : foreach [gr : items-of : AnyCv.query glyphs.(gid)] : begin
|
|
sink.push : gr.get glyphs.(gid)
|
|
return sink
|
|
|
|
export : define [finalizeTable table] : begin
|
|
set table.lookupOrder : toposort table.lookupDep
|
|
foreach [{key lang} : pairs-of table.languages] : begin
|
|
if lang.features : lang.features.sort
|