support negative numbers

Author: JanTvrdik

doc/grammars/const-expr.peg

@@ -9,15 +9,15 @@ ConstantExpr
   / ConstantFetch
 
 ConstantFloat
-  = [0-9]+ '.' [0-9]* ConstantFloatExp?
-  / [0-9]* '.' [0-9]+ ConstantFloatExp?
-  / [0-9]+ ConstantFloatExp
+  = '-'? [0-9]+ '.' [0-9]* ConstantFloatExp?
+  / '-'? [0-9]* '.' [0-9]+ ConstantFloatExp?
+  / '-'? [0-9]+ ConstantFloatExp
 
 ConstantFloatExp
-  = [eE] [0-9]+
+  = [eE] '-'? [0-9]+
 
 ConstantInt
-  = [0-9]+
+  = '-'? [0-9]+
 
 ConstantTrue
   = [tT][rR][uU][eE]

src/Lexer/Lexer.php

@@ -131,8 +131,8 @@ private function initialize(): void
 			self::TOKEN_CLOSE_PHPDOC => '\\*/',
 			self::TOKEN_PHPDOC_TAG => '@[a-z-]++',
 
-			self::TOKEN_FLOAT => '(?:[0-9]++\\.[0-9]*+(?:e[0-9]++)?)|(?:[0-9]*+\\.[0-9]++(?:e[0-9]++)?)|(?:[0-9]++e[0-9]++)',
-			self::TOKEN_INTEGER => '[0-9]++',
+			self::TOKEN_FLOAT => '(?:-?[0-9]++\\.[0-9]*+(?:e-?[0-9]++)?)|(?:-?[0-9]*+\\.[0-9]++(?:e-?[0-9]++)?)|(?:-?[0-9]++e-?[0-9]++)',
+			self::TOKEN_INTEGER => '-?[0-9]++',
 			self::TOKEN_SINGLE_QUOTED_STRING => '\'(?:\\\\.|[^\'])*+\'',
 			self::TOKEN_DOUBLE_QUOTED_STRING => '"(?:\\\\.|[^"])*+"',