feat: make Lipgloss Style thread-safe

get.go

@@ -397,12 +397,12 @@ func (s Style) GetFrameSize() (x, y int) {
 
 // Returns whether or not the given property is set.
 func (s Style) isSet(k propKey) bool {
-	_, exists := s.rules[k]
+	_, exists := s.rules.Load(k)
 	return exists
 }
 
 func (s Style) getAsBool(k propKey, defaultVal bool) bool {
-	v, ok := s.rules[k]
+	v, ok := s.rules.Load(k)
 	if !ok {
 		return defaultVal
 	}
@@ -413,7 +413,7 @@ func (s Style) getAsBool(k propKey, defaultVal bool) bool {
 }
 
 func (s Style) getAsColor(k propKey) TerminalColor {
-	v, ok := s.rules[k]
+	v, ok := s.rules.Load(k)
 	if !ok {
 		return noColor
 	}
@@ -424,7 +424,7 @@ func (s Style) getAsColor(k propKey) TerminalColor {
 }
 
 func (s Style) getAsInt(k propKey) int {
-	v, ok := s.rules[k]
+	v, ok := s.rules.Load(k)
 	if !ok {
 		return 0
 	}
@@ -435,7 +435,7 @@ func (s Style) getAsInt(k propKey) int {
 }
 
 func (s Style) getAsPosition(k propKey) Position {
-	v, ok := s.rules[k]
+	v, ok := s.rules.Load(k)
 	if !ok {
 		return Position(0)
 	}
@@ -446,7 +446,7 @@ func (s Style) getAsPosition(k propKey) Position {
 }
 
 func (s Style) getBorderStyle() Border {
-	v, ok := s.rules[borderStyleKey]
+	v, ok := s.rules.Load(borderStyleKey)
 	if !ok {
 		return noBorder
 	}

set.go

@@ -1,26 +1,16 @@
 package lipgloss
 
-// This could (should) probably just be moved into NewStyle(). We've broken it
-// out, so we can call it in a lazy way.
-func (s *Style) init() {
-	if s.rules == nil {
-		s.rules = make(rules)
-	}
-}
-
 // Set a value on the underlying rules map.
 func (s *Style) set(key propKey, value interface{}) {
-	s.init()
-
 	switch v := value.(type) {
 	case int:
 		// We don't allow negative integers on any of our values, so just keep
 		// them at zero or above. We could use uints instead, but the
 		// conversions are a little tedious, so we're sticking with ints for
 		// sake of usability.
-		s.rules[key] = max(0, v)
+		s.rules.Store(key, max(0, v))
 	default:
-		s.rules[key] = v
+		s.rules.Store(key, v)
 	}
 }
 

style.go

@@ -2,6 +2,7 @@ package lipgloss
 
 import (
 	"strings"
+	"sync"
 	"unicode"
 
 	"github.com/muesli/reflow/truncate"
@@ -72,9 +73,6 @@ const (
 	strikethroughSpacesKey
 )
 
-// A set of properties.
-type rules map[propKey]interface{}
-
 // StyleOption is a function that applies a style option to a Style.
 type StyleOption func(*Style)
 
@@ -98,7 +96,10 @@ func NewStyle(opts ...StyleOption) Style {
 // in case the underlying implementation changes. It takes an optional string
 // value to be set as the underlying string value for this style.
 func (r *Renderer) NewStyle(opts ...StyleOption) Style {
-	s := Style{r: r}
+	s := Style{
+		r:     r,
+		rules: &sync.Map{},
+	}
 	for _, opt := range opts {
 		opt(&s)
 	}
@@ -108,7 +109,7 @@ func (r *Renderer) NewStyle(opts ...StyleOption) Style {
 // Style contains a set of rules that comprise a style as a whole.
 type Style struct {
 	r     *Renderer
-	rules map[propKey]interface{}
+	rules *sync.Map
 	value string
 }
 
@@ -143,11 +144,12 @@ func (s Style) String() string {
 // Copy returns a copy of this style, including any underlying string values.
 func (s Style) Copy() Style {
 	o := NewStyle()
-	o.init()
-	for k, v := range s.rules {
-		o.rules[k] = v
-	}
+	s.rules.Range(func(k, v interface{}) bool {
+		o.rules.Store(k, v)
+		return true
+	})
 	o.r = s.r
+
 	o.value = s.value
 	return o
 }
@@ -158,28 +160,29 @@ func (s Style) Copy() Style {
 //
 // Margins, padding, and underlying string values are not inherited.
 func (s Style) Inherit(i Style) Style {
-	s.init()
-
-	for k, v := range i.rules {
+	i.rules.Range(func(k, v interface{}) bool {
 		switch k {
 		case marginTopKey, marginRightKey, marginBottomKey, marginLeftKey:
 			// Margins are not inherited
-			continue
+			return true
 		case paddingTopKey, paddingRightKey, paddingBottomKey, paddingLeftKey:
 			// Padding is not inherited
-			continue
+			return true
 		case backgroundKey:
 			// The margins also inherit the background color
 			if !s.isSet(marginBackgroundKey) && !i.isSet(marginBackgroundKey) {
-				s.rules[marginBackgroundKey] = v
+				s.rules.Store(marginBackgroundKey, v)
 			}
 		}
 
-		if _, exists := s.rules[k]; exists {
-			continue
+		if _, exists := s.rules.Load(k); exists {
+			return true
 		}
-		s.rules[k] = v
-	}
+
+		s.rules.Store(k, v)
+		return true
+	})
+
 	return s
 }
 
@@ -236,7 +239,12 @@ func (s Style) Render(strs ...string) string {
 		useSpaceStyler = underlineSpaces || strikethroughSpaces
 	)
 
-	if len(s.rules) == 0 {
+	var l int
+	s.rules.Range(func(k, v interface{}) bool {
+		l++
+		return false
+	})
+	if l == 0 {
 		return str
 	}