function isLegitCrossing()

in modules/validations/crossing_ways.js [80:120]
27 lines of code
43 McCabe index (conditional complexity)

    function isLegitCrossing(tags1, featureType1, tags2, featureType2) {

        // assume 0 by default
        var level1 = tags1.level || '0';
        var level2 = tags2.level || '0';

        if (taggedAsIndoor(tags1) && taggedAsIndoor(tags2) && level1 !== level2) {
            // assume features don't interact if they're indoor on different levels
            return true;
        }

        // assume 0 by default; don't use way.layer() since we account for structures here
        var layer1 = tags1.layer || '0';
        var layer2 = tags2.layer || '0';

        if (allowsBridge(featureType1) && allowsBridge(featureType2)) {
            if (hasTag(tags1, 'bridge') && !hasTag(tags2, 'bridge')) return true;
            if (!hasTag(tags1, 'bridge') && hasTag(tags2, 'bridge')) return true;
            // crossing bridges must use different layers
            if (hasTag(tags1, 'bridge') && hasTag(tags2, 'bridge') && layer1 !== layer2) return true;
        } else if (allowsBridge(featureType1) && hasTag(tags1, 'bridge')) return true;
        else if (allowsBridge(featureType2) && hasTag(tags2, 'bridge')) return true;

        if (allowsTunnel(featureType1) && allowsTunnel(featureType2)) {
            if (hasTag(tags1, 'tunnel') && !hasTag(tags2, 'tunnel')) return true;
            if (!hasTag(tags1, 'tunnel') && hasTag(tags2, 'tunnel')) return true;
            // crossing tunnels must use different layers
            if (hasTag(tags1, 'tunnel') && hasTag(tags2, 'tunnel') && layer1 !== layer2) return true;
        } else if (allowsTunnel(featureType1) && hasTag(tags1, 'tunnel')) return true;
        else if (allowsTunnel(featureType2) && hasTag(tags2, 'tunnel')) return true;

        // don't flag crossing waterways and pier/highways
        if (featureType1 === 'waterway' && featureType2 === 'highway' && tags2.man_made === 'pier') return true;
        if (featureType2 === 'waterway' && featureType1 === 'highway' && tags1.man_made === 'pier') return true;

        if (featureType1 === 'building' || featureType2 === 'building') {
            // for building crossings, different layers are enough
            if (layer1 !== layer2) return true;
        }
        return false;
    }