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add syriac, hindi, add default language and direction maps based on script.

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This commit is contained in:
fiatjaf
2023-12-25 23:42:14 -03:00
parent fff2b84090
commit b8600ba205
2 changed files with 45 additions and 13 deletions
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fonts/NotoSansSyriac.ttf Normal file
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58
image_utils.go
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@@ -19,7 +19,7 @@ import (
"github.com/pemistahl/lingua-go"
)
const nSupportedScripts = 12
const nSupportedScripts = 13
var (
supportedScripts = [nSupportedScripts]language.Script{
@@ -35,12 +35,45 @@ var (
language.Javanese,
language.Han,
language.Hangul,
language.Syriac,
}
detector lingua.LanguageDetector
scriptRanges []ScriptRange
fontMap [nSupportedScripts]font.Face
emojiFont font.Face
defaultLanguageMap = [nSupportedScripts]language.Language{
"en-us",
"en-us",
"ja",
"ja",
"he",
"th",
"ar",
"hi",
"bn",
"jv",
"zh",
"ko",
"syr",
}
directionMap = [nSupportedScripts]di.Direction{
di.DirectionLTR,
di.DirectionLTR,
di.DirectionLTR,
di.DirectionLTR,
di.DirectionRTL,
di.DirectionLTR,
di.DirectionRTL,
di.DirectionLTR,
di.DirectionLTR,
di.DirectionLTR,
di.DirectionLTR,
di.DirectionLTR,
di.DirectionRTL,
}
)
type ScriptRange struct {
@@ -60,6 +93,7 @@ func initializeImageDrawingStuff() error {
lingua.Hebrew,
lingua.Arabic,
lingua.Bengali,
lingua.Hindi,
lingua.Korean,
).WithLowAccuracyMode().Build()
@@ -168,28 +202,26 @@ func getLanguageAndScriptAndDirectionAndFont(paragraph []rune) (
var face font.Face
var idx int
for l := 0; l < nLetters; l++ {
idx := lookupScript(paragraph[l])
ranking[idx]++
if idx > 0 && l > threshold && ranking[idx] > threshold {
script = supportedScripts[idx]
face = fontMap[idx]
goto gotScript
rnidx := lookupScript(paragraph[l])
ranking[rnidx]++
if idx > 0 && l > threshold && ranking[rnidx] > threshold {
idx = rnidx
goto gotScriptIndex
}
}
idx = maxIndex(ranking[:])
gotScriptIndex:
script = supportedScripts[idx]
face = fontMap[idx]
gotScript:
direction := di.DirectionLTR
if script == language.Arabic {
direction = di.DirectionRTL
}
direction := directionMap[idx]
lng := language.Language("en-us")
lang, ok := detector.DetectLanguageOf(string(paragraph))
if ok {
lng = language.Language(lang.IsoCode639_1().String())
} else {
lng = defaultLanguageMap[idx]
}
return lng, script, direction, face