readsight 1.0.2

Multilingual readability library — 86 languages, 17 formulas, TeX-based syllable counting via the Frank M. Liang algorithm.
Documentation 
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{
    "code": "ru",
    "name": "Russian",
    "nativeName": "Русский",
    "script": "Cyrillic",
    "hyphenMins": {
        "left": 2,
        "right": 2
    },
    "letterPattern": "[А-Яа-яЁёҐ-ӿЀ-ӿ]",
    "wordSplitPattern": "[^\\p{L}'’-]+",
    "sentenceBoundaryPattern": "[.!?…]+",
    "syllableMode": "heuristic",
    "syllableHeuristics": {
        "vowelPattern": "[аеёиоуыэюя]",
        "vowelMode": "individual"
    },
    "formulas": {
        "gunning_fog": {
            "enabled": true
        },
        "smog": {
            "enabled": true
        },
        "coleman_liau": {
            "enabled": true
        },
        "ari": {
            "enabled": true
        },
        "lix": {
            "enabled": true,
            "longWordThreshold": 6
        },
        "flesch_reading_ease": {
            "enabled": true,
            "base": 206.835,
            "aslMult": 1.52,
            "aswMult": 65.14
        },
        "flesch_kincaid_grade_level": {
            "enabled": true
        }
    }
}