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extension WmapParser {
/// Looks for -- or ->. If found, returns where this arrow starts.
@inline(__always)
static func hasDependency<T: Collection>(_ bytes: T, _ start: Int, _ end: Int) -> Int?
where T.Element == UInt8, T.Index == Int {
var index = start
while index < end {
if bytes[index] == kOpenParenthesis { return nil }
if bytes[index] == kDash && index + 1 < end {
let next = bytes[index + 1]
if next == kGreaterThan || next == kDash { return index }
}
index += 1
}
return nil
}
/// Finds a dependency and whether it's directed. It assumes we previously
/// checked for the location of our separator to speed things up.
static func parseDependency<T: Collection>(
_ bytes: T, _ start: Int, _ end: Int, _ separatorIndex: Int
)
-> Dependency?
where T.Element == UInt8, T.Index == Int {
let isDirected = extractIsDirected(bytes, separatorIndex, end)
guard let fromComponent = extractTrimmedString(bytes, start, separatorIndex) else {
return nil
}
guard let toComponent = extractTrimmedString(bytes, separatorIndex + 2, end) else {
return nil
}
return Dependency(
fromComponent: fromComponent, toComponent: toComponent, isDirected: isDirected)
}
/// Checks the second character of the separator to see if it's directed.
/// It assumes we already checked for -- or ->, so it only checks for
/// Whether it's greaterThan or not.
@inline(__always)
private static func extractIsDirected<T: Collection>(
_ bytes: T, _ separatorIndex: Int, _ end: Int
)
-> Bool
where T.Element == UInt8, T.Index == Int {
let followingCharacter = separatorIndex + 1
guard followingCharacter < end else { return false }
if bytes[followingCharacter] == kGreaterThan {
return true
}
return false
}
}
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