biner/lib/types/when.js

Declarative binary data encoder / decoder.

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
const util_1 = require("../util");
const symbols = require("../internal/symbols");
const decode_1 = require("../decode");
const encode_1 = require("../encode");
const encoding_length_1 = require("../encoding-length");
const meta_1 = require("../internal/meta");
function when(condition, type) {
    if (!util_1.isType(type) && !util_1.isUserType(type)) {
        throw new TypeError('Argument #2 should be a valid type.');
    }
    const result = {
        encode,
        decode,
        encodingLength,
        [symbols.skip]: false,
    };
    return result;
    function encode(value, wstream) {
        const context = meta_1.Metadata.clone(this);
        let bytes = 0;
        const status = util_1.isFunction(condition)
            ? Boolean(condition(context))
            : Boolean(condition);
        result[symbols.skip] = !status;
        if (!status) {
            meta_1.Metadata.clean(context);
            return bytes;
        }
        encode_1.encodeCommon(value, wstream, type, context);
        bytes = context.bytes;
        meta_1.Metadata.clean(context);
        return bytes;
    }
    function decode(rstream) {
        const context = meta_1.Metadata.clone(this);
        let bytes = 0;
        const status = util_1.isFunction(condition)
            ? Boolean(condition(context))
            : Boolean(condition);
        result[symbols.skip] = !status;
        if (!status) {
            meta_1.Metadata.clean(context);
            return [undefined, bytes];
        }
        const value = decode_1.decodeCommon(rstream, type, context);
        bytes = context.bytes;
        meta_1.Metadata.clean(context);
        return [value, bytes];
    }
    function encodingLength(value) {
        const context = meta_1.Metadata.clone(this);
        const status = util_1.isFunction(condition)
            ? Boolean(condition(context))
            : Boolean(condition);
        if (status) {
            encoding_length_1.encodingLengthCommon(value, type, context);
        }
        meta_1.Metadata.clean(context);
        return context.bytes;
    }
}
exports.when = when;
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