From 4e12d320eb240fe245faaba164e40d0d430e36b7 Mon Sep 17 00:00:00 2001
From: nebula-bots <88429921+nebula-bots@users.noreply.github.com>
Date: Tue, 12 Apr 2022 18:10:51 +0800
Subject: [PATCH] fix the wrong regex pattern of scientific notation (#794)

Co-authored-by: jie.wang <38901892+jievince@users.noreply.github.com>
---
 src/parser/scanner.lex          | 5 ++---
 src/parser/test/ScannerTest.cpp | 3 +++
 2 files changed, 5 insertions(+), 3 deletions(-)

diff --git a/src/parser/scanner.lex b/src/parser/scanner.lex
index b451467e0b4..4ebf867ce4e 100644
--- a/src/parser/scanner.lex
+++ b/src/parser/scanner.lex
@@ -409,9 +409,8 @@ LABEL_FULL_WIDTH            {CN_EN_FULL_WIDTH}{CN_EN_NUM_FULL_WIDTH}*
                                 return parseDecimal();
                             }
 
-{DEC}*\.{DEC}+              |
-{DEC}+\.{DEC}*              |
-{DEC}*\.{DEC}*{EXP}         |
+{DEC}*\.{DEC}+{EXP}?        |
+{DEC}+\.{DEC}*{EXP}?        |
 {DEC}+{EXP}                 {
                                 return parseDouble();
                             }
diff --git a/src/parser/test/ScannerTest.cpp b/src/parser/test/ScannerTest.cpp
index a841ca5fbd1..68e822ec40d 100644
--- a/src/parser/test/ScannerTest.cpp
+++ b/src/parser/test/ScannerTest.cpp
@@ -546,6 +546,9 @@ TEST(Scanner, Basic) {
       CHECK_SEMANTIC_VALUE("123.", TokenType::DOUBLE, 123.),
       CHECK_SEMANTIC_VALUE(".123", TokenType::DOUBLE, 0.123),
       CHECK_SEMANTIC_VALUE("123.456", TokenType::DOUBLE, 123.456),
+      CHECK_SEMANTIC_VALUE("1.2e1", TokenType::DOUBLE, 12.0),
+      CHECK_SEMANTIC_VALUE("1.e2", TokenType::DOUBLE, 100.0),
+      CHECK_SEMANTIC_VALUE(".2e3", TokenType::DOUBLE, 200.0),
 
       CHECK_SEMANTIC_VALUE("0x7FFFFFFFFFFFFFFF", TokenType::INTEGER, 0x7FFFFFFFFFFFFFFFL),
       CHECK_SEMANTIC_VALUE("0x007FFFFFFFFFFFFFFF", TokenType::INTEGER, 0x007FFFFFFFFFFFFFFFL),