feat: expose the lexer to be used by users

pkg/lexer/lexer.go

@@ -0,0 +1,28 @@
+package lexer
+
+import (
+	"errors"
+
+	"github.com/laytan/php-parser/internal/php7"
+	"github.com/laytan/php-parser/internal/php8"
+	"github.com/laytan/php-parser/pkg/conf"
+	"github.com/laytan/php-parser/pkg/token"
+)
+
+var ErrVersionOutOfRange = errors.New("the version is out of supported range")
+
+type Lexer interface {
+	Lex() *token.Token
+}
+
+func New(src []byte, config conf.Config) (Lexer, error) {
+	if config.Version.InPhp7Range() {
+		return php7.NewLexer(src, config), nil
+	}
+
+	if config.Version.InPhp8Range() {
+		return php8.NewLexer(src, config), nil
+	}
+
+	return nil, ErrVersionOutOfRange
+}

pkg/parser/parser.go

@@ -10,16 +10,8 @@ import (
 	"github.com/laytan/php-parser/pkg/version"
 )
 
-var (
 // ErrVersionOutOfRange is returned if the version is not supported
-	ErrVersionOutOfRange = errors.New("the version is out of supported range")
-
-	php7RangeStart = &version.Version{Major: 7}
-	php7RangeEnd   = &version.Version{Major: 7, Minor: 4}
-
-	php8RangeStart = &version.Version{Major: 8}
-	php8RangeEnd   = &version.Version{Major: 8, Minor: 2}
-)
+var ErrVersionOutOfRange = errors.New("the version is out of supported range")
 
 // Parser interface
 type Parser interface {
@@ -31,17 +23,17 @@ func Parse(src []byte, config conf.Config) (ast.Vertex, error) {
 	var parser Parser
 
 	if config.Version == nil {
-		config.Version = php7RangeEnd
+		config.Version = &version.Version{Major: 7, Minor: 4}
 	}
 
-	if config.Version.InRange(php7RangeStart, php7RangeEnd) {
+	if config.Version.InPhp7Range() {
 		lexer := php7.NewLexer(src, config)
 		parser = php7.NewParser(lexer, config)
 		parser.Parse()
 		return parser.GetRootNode(), nil
 	}
 
-	if config.Version.InRange(php8RangeStart, php8RangeEnd) {
+	if config.Version.InPhp8Range() {
 		lexer := php8.NewLexer(src, config)
 		parser = php8.NewParser(lexer, config)
 		parser.Parse()

pkg/version/version.go

@@ -81,6 +81,14 @@ func (v *Version) InRange(s, e *Version) bool {
 	return v.Compare(s) >= 0 && v.Compare(e) <= 0
 }
 
+func (v *Version) InPhp7Range() bool {
+    return v.InRange(php7RangeStart, php7RangeEnd)
+}
+
+func (v *Version) InPhp8Range() bool {
+    return v.InRange(php8RangeStart, php8RangeEnd)
+}
+
 // Compare compares this version to another one. It returns -1, 0, or 1 if
 // the version smaller, equal, or larger than the other version.
 func (v *Version) Compare(o *Version) int {