Add "+" sign support for float exponent

Author: mvorisek

doc/grammars/type.abnf

@@ -90,7 +90,7 @@ ConstantFloat
 	/ ["-"] "." 1*ByteDecDigit *("_" 1*ByteDecDigit) [ConstantFloatExp]
 
 ConstantFloatExp
-	= "e" ["-"] 1*ByteDecDigit *("_" 1*ByteDecDigit)
+	= "e" ["+" / "-"] 1*ByteDecDigit *("_" 1*ByteDecDigit)
 
 ConstantInt
 	= ["-"] "0b" 1*ByteBinDigit *("_" 1*ByteBinDigit)
@@ -229,14 +229,14 @@ ByteHexDigit
 
 ByteIdentifierFirst
 	= %x41-5A ; A-Z
-	/ %x5F    ; _
+	/ "_"
 	/ %x61-7A ; a-z
 	/ %x80-FF
 
 ByteIdentifierSecond
 	= %x30-39 ; 0-9
 	/ %x41-5A ; A-Z
-	/ %x5F    ; _
+	/ "_"
 	/ %x61-7A ; a-z
 	/ %x80-FF
 

src/Lexer/Lexer.php

@@ -160,7 +160,7 @@ private function generateRegexp(): string
 			self::TOKEN_PHPDOC_TAG => '@(?:[a-z][a-z0-9-\\\\]+:)?[a-z][a-z0-9-\\\\]*+',
 			self::TOKEN_PHPDOC_EOL => '\\r?+\\n[\\x09\\x20]*+(?:\\*(?!/)\\x20?+)?',
 
-			self::TOKEN_FLOAT => '(?:-?[0-9]++(_[0-9]++)*\\.[0-9]*(_[0-9]++)*+(?:e-?[0-9]++(_[0-9]++)*)?)|(?:-?[0-9]*+(_[0-9]++)*\\.[0-9]++(_[0-9]++)*(?:e-?[0-9]++(_[0-9]++)*)?)|(?:-?[0-9]++(_[0-9]++)*e-?[0-9]++(_[0-9]++)*)',
+			self::TOKEN_FLOAT => '(?:-?[0-9]++(_[0-9]++)*\\.[0-9]*+(_[0-9]++)*(?:e[+-]?[0-9]++(_[0-9]++)*)?)|(?:-?[0-9]*+(_[0-9]++)*\\.[0-9]++(_[0-9]++)*(?:e[+-]?[0-9]++(_[0-9]++)*)?)|(?:-?[0-9]++(_[0-9]++)*e[+-]?[0-9]++(_[0-9]++)*)',
 			self::TOKEN_INTEGER => '-?(?:(?:0b[0-1]++(_[0-1]++)*)|(?:0o[0-7]++(_[0-7]++)*)|(?:0x[0-9a-f]++(_[0-9a-f]++)*)|(?:[0-9]++(_[0-9]++)*))',
 			self::TOKEN_SINGLE_QUOTED_STRING => '\'(?:\\\\[^\\r\\n]|[^\'\\r\\n\\\\])*+\'',
 			self::TOKEN_DOUBLE_QUOTED_STRING => '"(?:\\\\[^\\r\\n]|[^"\\r\\n\\\\])*+"',

tests/PHPStan/Parser/ConstExprParserTest.php

@@ -152,6 +152,11 @@ public function provideIntegerNodeParseData(): Iterator
 			new ConstExprIntegerNode('123'),
 		];
 
+		yield [
+			'-123',
+			new ConstExprIntegerNode('-123'),
+		];
+
 		yield [
 			'0b0110101',
 			new ConstExprIntegerNode('0b0110101'),
@@ -191,6 +196,11 @@ public function provideIntegerNodeParseData(): Iterator
 			'-0X7_Fb_4',
 			new ConstExprIntegerNode('-0X7Fb4'),
 		];
+
+		yield [
+			'18_446_744_073_709_551_616', // 64-bit unsigned long + 1, larger than PHP_INT_MAX
+			new ConstExprIntegerNode('18446744073709551616'),
+		];
 	}
 
 
@@ -227,8 +237,8 @@ public function provideFloatNodeParseData(): Iterator
 		];
 
 		yield [
-			'-123',
-			new ConstExprIntegerNode('-123'),
+			'-123.',
+			new ConstExprFloatNode('-123.'),
 		];
 
 		yield [
@@ -260,6 +270,31 @@ public function provideFloatNodeParseData(): Iterator
 			'-1_2.3_4e5_6',
 			new ConstExprFloatNode('-12.34e56'),
 		];
+
+		yield [
+			'123.4e+8',
+			new ConstExprFloatNode('123.4e+8'),
+		];
+
+		yield [
+			'.4e+8',
+			new ConstExprFloatNode('.4e+8'),
+		];
+
+		yield [
+			'123E+80',
+			new ConstExprFloatNode('123E+80'),
+		];
+
+		yield [
+			'8.2023437675747321', // greater precision than 64-bit double
+			new ConstExprFloatNode('8.2023437675747321'),
+		];
+
+		yield [
+			'-0.0',
+			new ConstExprFloatNode('-0.0'),
+		];
 	}
 
 

tests/PHPStan/Parser/TypeParserTest.php

@@ -1095,6 +1095,13 @@ public function provideParseData(): array
 				'123_456.789_012',
 				new ConstTypeNode(new ConstExprFloatNode('123456.789012')),
 			],
+			[
+				'18_446_744_073_709_551_616|8.2023437675747321e-18_446_744_073_709_551_617',
+				new UnionTypeNode([
+					new ConstTypeNode(new ConstExprIntegerNode('18446744073709551616')),
+					new ConstTypeNode(new ConstExprFloatNode('8.2023437675747321e-18446744073709551617')),
+				]),
+			],
 			[
 				'"bar"',
 				new ConstTypeNode(new QuoteAwareConstExprStringNode('bar', QuoteAwareConstExprStringNode::DOUBLE_QUOTED)),