fix the wrong regex pattern of scientific notation (vesoft-inc#794)

Co-authored-by: jie.wang <[email protected]>
liwenhui-soul · Apr 12, 2022 · 4e12d32 · 4e12d32
1 parent e897ad6
commit 4e12d32
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Showing 2 changed files with 5 additions and 3 deletions.
diff --git 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
@@ -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),