fix the wrong regex pattern of scientific notation (#4136)

vesoft-inc · Apr 12, 2022 · 84d34ad · 84d34ad
1 parent 39fbb94
commit 84d34ad
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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
@@ -402,9 +402,8 @@ 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
@@ -540,6 +540,9 @@ 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),