sourav-das/stem-separator

1const util = require('./util')2 3module.exports = function stringify (value, replacer, space) {4    const stack = []5    let indent = ''6    let propertyList7    let replacerFunc8    let gap = ''9    let quote10 11    if (12        replacer != null &&13        typeof replacer === 'object' &&14        !Array.isArray(replacer)15    ) {16        space = replacer.space17        quote = replacer.quote18        replacer = replacer.replacer19    }20 21    if (typeof replacer === 'function') {22        replacerFunc = replacer23    } else if (Array.isArray(replacer)) {24        propertyList = []25        for (const v of replacer) {26            let item27 28            if (typeof v === 'string') {29                item = v30            } else if (31                typeof v === 'number' ||32                v instanceof String ||33                v instanceof Number34            ) {35                item = String(v)36            }37 38            if (item !== undefined && propertyList.indexOf(item) < 0) {39                propertyList.push(item)40            }41        }42    }43 44    if (space instanceof Number) {45        space = Number(space)46    } else if (space instanceof String) {47        space = String(space)48    }49 50    if (typeof space === 'number') {51        if (space > 0) {52            space = Math.min(10, Math.floor(space))53            gap = '          '.substr(0, space)54        }55    } else if (typeof space === 'string') {56        gap = space.substr(0, 10)57    }58 59    return serializeProperty('', {'': value})60 61    function serializeProperty (key, holder) {62        let value = holder[key]63        if (value != null) {64            if (typeof value.toJSON5 === 'function') {65                value = value.toJSON5(key)66            } else if (typeof value.toJSON === 'function') {67                value = value.toJSON(key)68            }69        }70 71        if (replacerFunc) {72            value = replacerFunc.call(holder, key, value)73        }74 75        if (value instanceof Number) {76            value = Number(value)77        } else if (value instanceof String) {78            value = String(value)79        } else if (value instanceof Boolean) {80            value = value.valueOf()81        }82 83        switch (value) {84        case null: return 'null'85        case true: return 'true'86        case false: return 'false'87        }88 89        if (typeof value === 'string') {90            return quoteString(value, false)91        }92 93        if (typeof value === 'number') {94            return String(value)95        }96 97        if (typeof value === 'object') {98            return Array.isArray(value) ? serializeArray(value) : serializeObject(value)99        }100 101        return undefined102    }103 104    function quoteString (value) {105        const quotes = {106            "'": 0.1,107            '"': 0.2,108        }109 110        const replacements = {111            "'": "\\'",112            '"': '\\"',113            '\\': '\\\\',114            '\b': '\\b',115            '\f': '\\f',116            '\n': '\\n',117            '\r': '\\r',118            '\t': '\\t',119            '\v': '\\v',120            '\0': '\\0',121            '\u2028': '\\u2028',122            '\u2029': '\\u2029',123        }124 125        let product = ''126 127        for (let i = 0; i < value.length; i++) {128            const c = value[i]129            switch (c) {130            case "'":131            case '"':132                quotes[c]++133                product += c134                continue135 136            case '\0':137                if (util.isDigit(value[i + 1])) {138                    product += '\\x00'139                    continue140                }141            }142 143            if (replacements[c]) {144                product += replacements[c]145                continue146            }147 148            if (c < ' ') {149                let hexString = c.charCodeAt(0).toString(16)150                product += '\\x' + ('00' + hexString).substring(hexString.length)151                continue152            }153 154            product += c155        }156 157        const quoteChar = quote || Object.keys(quotes).reduce((a, b) => (quotes[a] < quotes[b]) ? a : b)158 159        product = product.replace(new RegExp(quoteChar, 'g'), replacements[quoteChar])160 161        return quoteChar + product + quoteChar162    }163 164    function serializeObject (value) {165        if (stack.indexOf(value) >= 0) {166            throw TypeError('Converting circular structure to JSON5')167        }168 169        stack.push(value)170 171        let stepback = indent172        indent = indent + gap173 174        let keys = propertyList || Object.keys(value)175        let partial = []176        for (const key of keys) {177            const propertyString = serializeProperty(key, value)178            if (propertyString !== undefined) {179                let member = serializeKey(key) + ':'180                if (gap !== '') {181                    member += ' '182                }183                member += propertyString184                partial.push(member)185            }186        }187 188        let final189        if (partial.length === 0) {190            final = '{}'191        } else {192            let properties193            if (gap === '') {194                properties = partial.join(',')195                final = '{' + properties + '}'196            } else {197                let separator = ',\n' + indent198                properties = partial.join(separator)199                final = '{\n' + indent + properties + ',\n' + stepback + '}'200            }201        }202 203        stack.pop()204        indent = stepback205        return final206    }207 208    function serializeKey (key) {209        if (key.length === 0) {210            return quoteString(key, true)211        }212 213        const firstChar = String.fromCodePoint(key.codePointAt(0))214        if (!util.isIdStartChar(firstChar)) {215            return quoteString(key, true)216        }217 218        for (let i = firstChar.length; i < key.length; i++) {219            if (!util.isIdContinueChar(String.fromCodePoint(key.codePointAt(i)))) {220                return quoteString(key, true)221            }222        }223 224        return key225    }226 227    function serializeArray (value) {228        if (stack.indexOf(value) >= 0) {229            throw TypeError('Converting circular structure to JSON5')230        }231 232        stack.push(value)233 234        let stepback = indent235        indent = indent + gap236 237        let partial = []238        for (let i = 0; i < value.length; i++) {239            const propertyString = serializeProperty(String(i), value)240            partial.push((propertyString !== undefined) ? propertyString : 'null')241        }242 243        let final244        if (partial.length === 0) {245            final = '[]'246        } else {247            if (gap === '') {248                let properties = partial.join(',')249                final = '[' + properties + ']'250            } else {251                let separator = ',\n' + indent252                let properties = partial.join(separator)253                final = '[\n' + indent + properties + ',\n' + stepback + ']'254            }255        }256 257        stack.pop()258        indent = stepback259        return final260    }261}262