pk-template/src/selectors.js

p template engine for kubernetes

const selectors = {
    makePredicate: src => {
        const nv = src.split('=');

        if (nv.length > 1) {
            const lname = nv[0];
            const value = nv[1];
            if (lname[0] === '!') {
                const aname = lname.substring(1)
                return object =>
                    object.metadata &&
                    object.metadata.annotations &&
                    (
                        value === '*'
                            ? aname in object.metadata.annotations
                            : object.metadata.annotations[aname] === value
                    );
            }
            return object =>
                object.metadata &&
                object.metadata.labels &&
                (
                    value === '*'
                        ? lname in object.metadata.labels
                        : object.metadata.labels[lname] === value
                );
        } else if (src[0] === '.') {
            const name = src.substr(1);
            return object =>
                object.metadata &&
                object.metadata.name == name;
        } else {
            return object => object.kind === src;
        }
    },
    compileOne: src => {
        const predicates = src.split(/\s+/)
            .map(selectors.makePredicate);
        return object => predicates.every(pred => pred(object));
    },
    compile: src => {
        if (typeof src === 'string')
            src = [ src ];
        const predicates = src.map(selectors.compileOne);
        return object => predicates.some(pred => pred(object));
    }
};

module.exports = selectors;