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//===----------------------------------------------------------------------===//
//
// This source file is part of the Swift.org open source project
//
// Copyright (c) 2021-2022 Apple Inc. and the Swift project authors
// Licensed under Apache License v2.0 with Runtime Library Exception
//
// See https://swift.org/LICENSE.txt for license information
//
//===----------------------------------------------------------------------===//
internal import _RegexParser
struct SentinelValue: Hashable, CustomStringConvertible {
var description: String { "<value sentinel>" }
}
extension Processor {
/// Our register file
struct Registers {
// MARK: static / read-only, non-resettable
// Verbatim elements to compare against
var elements: [Element]
// Verbatim bytes to compare against
var utf8Contents: [[UInt8]]
var bitsets: [DSLTree.CustomCharacterClass.AsciiBitset]
var consumeFunctions: [MEProgram.ConsumeFunction]
// Captured-value constructors
var transformFunctions: [MEProgram.TransformFunction]
// Value-constructing matchers
var matcherFunctions: [MEProgram.MatcherFunction]
// MARK: writeable, resettable
var isDirty = false
// currently, useful for range-based quantification
var ints: [Int]
var values: [Any]
var positions: [Input.Index]
init(
elements: [Element],
utf8Contents: [[UInt8]],
bitsets: [DSLTree.CustomCharacterClass.AsciiBitset],
consumeFunctions: [MEProgram.ConsumeFunction],
transformFunctions: [MEProgram.TransformFunction],
matcherFunctions: [MEProgram.MatcherFunction],
isDirty: Bool = false,
numInts: Int,
numValues: Int,
numPositions: Int
) {
self.elements = elements
self.utf8Contents = utf8Contents
self.bitsets = bitsets
self.consumeFunctions = consumeFunctions
self.transformFunctions = transformFunctions
self.matcherFunctions = matcherFunctions
self.isDirty = isDirty
self.ints = Array(repeating: 0, count: numInts)
self.values = Array(repeating: SentinelValue(), count: numValues)
self.positions = Array(
repeating: Self.sentinelIndex, count: numPositions)
}
}
}
extension Processor.Registers {
typealias Input = String
subscript(_ i: IntRegister) -> Int {
get { ints[i.rawValue] }
set {
isDirty = true
ints[i.rawValue] = newValue
}
}
subscript(_ i: ValueRegister) -> Any {
get { values[i.rawValue] }
set {
isDirty = true
values[i.rawValue] = newValue
}
}
subscript(_ i: PositionRegister) -> Input.Index {
get { positions[i.rawValue] }
set {
isDirty = true
positions[i.rawValue] = newValue
}
}
subscript(_ i: ElementRegister) -> Input.Element {
elements[i.rawValue]
}
subscript(_ i: UTF8Register) -> [UInt8] {
utf8Contents[i.rawValue]
}
subscript(
_ i: AsciiBitsetRegister
) -> DSLTree.CustomCharacterClass.AsciiBitset {
bitsets[i.rawValue]
}
subscript(_ i: ConsumeFunctionRegister) -> MEProgram.ConsumeFunction {
consumeFunctions[i.rawValue]
}
subscript(_ i: TransformRegister) -> MEProgram.TransformFunction {
transformFunctions[i.rawValue]
}
subscript(_ i: MatcherRegister) -> MEProgram.MatcherFunction {
matcherFunctions[i.rawValue]
}
}
extension Processor.Registers {
static var sentinelIndex: String.Index {
"".startIndex
}
mutating func reset() {
guard isDirty else {
return
}
self.ints._setAll(to: 0)
self.values._setAll(to: SentinelValue())
self.positions._setAll(to: Processor.Registers.sentinelIndex)
}
}
// TODO: Productize into general algorithm
extension MutableCollection {
mutating func _setAll(to e: Element) {
for idx in self.indices {
self[idx] = e
}
}
}
extension Processor.Registers: CustomStringConvertible {
var description: String {
func formatRegisters<T>(
_ name: String, _ regs: [T]
) -> String {
// TODO: multi-line if long
if regs.isEmpty { return "" }
return "\(name): \(regs)\n"
}
return """
\(formatRegisters("elements", elements))\
\(formatRegisters("ints", ints))\
"""
}
}
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