function parsePinName()

in patcher/patcher.js [868:912]
37 lines of code
12 McCabe index (conditional complexity)

function parsePinName(v, portSize) {
    let thePort = -1
    let pin = -1

    v = v.trim()

    const env = enums["."][v]
    if (env !== undefined)
        return env

    let m = /(.*)([\|+])(.*)/.exec(v)
    if (m) {
        let v0 = parsePinName(m[1], portSize)
        let v1 = parsePinName(m[3], portSize)
        if (v0 === undefined || v1 === undefined)
            return undefined
        v0 = parseInt(v0)
        v1 = parseInt(v1)
        return "" + (m[2] == "|" ? v0 | v1 : v0 + v1)
    }

    m = /^P([A-Z])_?(\d+)$/.exec(v)
    if (m) {
        pin = parseInt(m[2])
        thePort = m[1].charCodeAt(0) - 65
    }

    m = /^P(\d+)_(\d+)$/.exec(v)
    if (m) {
        pin = parseInt(m[2])
        thePort = parseInt(m[1])
    }

    if (thePort >= 0) {
        if (!portSize) err("PINS_PORT_SIZE not specified, while trying to parse PIN " + v)
        if (pin >= portSize) err("Pin name invalid: " + v)
        return (thePort * portSize + pin) + ""
    }

    m = /^P_?(\d+)$/.exec(v)
    if (m)
        return m[1]

    return undefined
}