chore(deps): upgrade dependencies

Upgrade all dependencies to newest versions.

vendor/github.com/dlclark/regexp2/fastclock.go

@@ -0,0 +1,129 @@
+package regexp2
+
+import (
+	"sync"
+	"sync/atomic"
+	"time"
+)
+
+// fasttime holds a time value (ticks since clock initialization)
+type fasttime int64
+
+// fastclock provides a fast clock implementation.
+//
+// A background goroutine periodically stores the current time
+// into an atomic variable.
+//
+// A deadline can be quickly checked for expiration by comparing
+// its value to the clock stored in the atomic variable.
+//
+// The goroutine automatically stops once clockEnd is reached.
+// (clockEnd covers the largest deadline seen so far + some
+// extra time). This ensures that if regexp2 with timeouts
+// stops being used we will stop background work.
+type fastclock struct {
+	// instances of atomicTime must be at the start of the struct (or at least 64-bit aligned)
+	// otherwise 32-bit architectures will panic
+
+	current  atomicTime // Current time (approximate)
+	clockEnd atomicTime // When clock updater is supposed to stop (>= any existing deadline)
+
+	// current and clockEnd can be read via atomic loads.
+	// Reads and writes of other fields require mu to be held.
+	mu      sync.Mutex
+	start   time.Time // Time corresponding to fasttime(0)
+	running bool      // Is a clock updater running?
+}
+
+var fast fastclock
+
+// reached returns true if current time is at or past t.
+func (t fasttime) reached() bool {
+	return fast.current.read() >= t
+}
+
+// makeDeadline returns a time that is approximately time.Now().Add(d)
+func makeDeadline(d time.Duration) fasttime {
+	// Increase the deadline since the clock we are reading may be
+	// just about to tick forwards.
+	end := fast.current.read() + durationToTicks(d+clockPeriod)
+
+	// Start or extend clock if necessary.
+	if end > fast.clockEnd.read() {
+		extendClock(end)
+	}
+	return end
+}
+
+// extendClock ensures that clock is live and will run until at least end.
+func extendClock(end fasttime) {
+	fast.mu.Lock()
+	defer fast.mu.Unlock()
+
+	if fast.start.IsZero() {
+		fast.start = time.Now()
+	}
+
+	// Extend the running time to cover end as well as a bit of slop.
+	if shutdown := end + durationToTicks(time.Second); shutdown > fast.clockEnd.read() {
+		fast.clockEnd.write(shutdown)
+	}
+
+	// Start clock if necessary
+	if !fast.running {
+		fast.running = true
+		go runClock()
+	}
+}
+
+// stop the timeout clock in the background
+// should only used for unit tests to abandon the background goroutine
+func stopClock() {
+	fast.mu.Lock()
+	if fast.running {
+		fast.clockEnd.write(fasttime(0))
+	}
+	fast.mu.Unlock()
+
+	// pause until not running
+	// get and release the lock
+	isRunning := true
+	for isRunning {
+		time.Sleep(clockPeriod / 2)
+		fast.mu.Lock()
+		isRunning = fast.running
+		fast.mu.Unlock()
+	}
+}
+
+func durationToTicks(d time.Duration) fasttime {
+	// Downscale nanoseconds to approximately a millisecond so that we can avoid
+	// overflow even if the caller passes in math.MaxInt64.
+	return fasttime(d) >> 20
+}
+
+const DefaultClockPeriod = 100 * time.Millisecond
+
+// clockPeriod is the approximate interval between updates of approximateClock.
+var clockPeriod = DefaultClockPeriod
+
+func runClock() {
+	fast.mu.Lock()
+	defer fast.mu.Unlock()
+
+	for fast.current.read() <= fast.clockEnd.read() {
+		// Unlock while sleeping.
+		fast.mu.Unlock()
+		time.Sleep(clockPeriod)
+		fast.mu.Lock()
+
+		newTime := durationToTicks(time.Since(fast.start))
+		fast.current.write(newTime)
+	}
+	fast.running = false
+}
+
+type atomicTime struct{ v int64 } // Should change to atomic.Int64 when we can use go 1.19
+
+func (t *atomicTime) read() fasttime   { return fasttime(atomic.LoadInt64(&t.v)) }
+func (t *atomicTime) write(v fasttime) { atomic.StoreInt64(&t.v, int64(v)) }