snowflake-sdk/dist/lib/connection/result/datetime_format_converter.js

Node.js driver for Snowflake

"use strict";
/**
 * The map of symbols for datatime representation in Snowflake and in Moment.js formatting.
 * The order of tags is important Please don't change it
 */
function formatTagsMap() {
    return [
        // proper mappings
        ['YYYY', 'YYYY'],
        ['YY', 'YY'],
        ['MM', 'MM'],
        ['MON', 'MMM'],
        ['DD', 'DD'],
        ['DY', 'ddd'],
        ['HH24', 'HH'],
        ['HH12', 'hh'],
        ['HH', 'HH'],
        ['AM', 'A'],
        ['PM', 'A'],
        ['MI', 'mm'],
        ['SS', 'ss'],
        ['TZH:TZM', 'Z'],
        ['TZHTZM', 'ZZ'],
        // special code needed
        ['TZH', ''],
        ['TZM', ''],
        ['FF', ''],
    ];
}
function convertSnowflakeFormatToMomentFormat(formatSql, scale) {
    const tags = formatTagsMap();
    // get an upper-case version of the input sql format
    const formatSqlUpper = formatSql.toUpperCase();
    // iterate over the format string
    const length = formatSql.length;
    let formatMoment = '';
    for (let pos = 0; pos < length;) {
        let tag = null;
        let out = null;
        // at each position, check if there's a tag at that position; if so, use
        // 'out' as the replacement
        for (let index = 0; index < tags.length; index++) {
            if (formatSqlUpper.substr(pos).indexOf(tags[index][0]) === 0) {
                tag = tags[index][0];
                out = tags[index][1];
                break;
            }
        }
        // if we didn't find a match, just insert the character after escaping it
        // (by wrapping it in square brackets)
        if (out === null) {
            formatMoment += formatSql[pos];
            pos++;
        }
        else {
            // we found one of our special tags
            if (out === '') {
                if (tag === 'TZH') {
                    out = 'Z';
                }
                else if (tag === 'FF') {
                    // if 'FF' is followed by a digit, use the digit as the scale
                    let digit = null;
                    if (pos + tag.length < length) {
                        const matches = formatSql[pos + tag.length].match(/[0-9]/);
                        if (matches) {
                            digit = matches[0];
                        }
                    }
                    if (digit !== null) {
                        pos++; // skip the digit as well
                    }
                    // if we need to include fractional seconds
                    if (scale > 0) {
                        // divide the nanoSeconds to get the requested number of
                        // meaningful digits
                        // pad with the appropriate number of leading zeros
                        out = new Array(9).join('S').substr(-scale);
                    }
                }
            }
            // append the 'out' text to the moment format and update the position
            formatMoment += out;
            pos += tag.length;
        }
    }
    return formatMoment;
}
module.exports.formatTagsMap = formatTagsMap;
module.exports.convertSnowflakeFormatToMomentFormat = convertSnowflakeFormatToMomentFormat;
//# sourceMappingURL=datetime_format_converter.js.map