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Merge pull request #4172 from ethereum/trailing_dot

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[BREAKING] Disallow trailing dot not followed by number
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chriseth 2018-05-30 18:51:52 +02:00 committed by GitHub
commit 0a1a8bfb09
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6 changed files with 46 additions and 1 deletions
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1
Changelog.md
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@ -9,6 +9,7 @@ Breaking Changes:
* General: New keywords: ``calldata``
* General: ``continue`` in a ``do...while`` loop jumps to the condition (it used to jump to the loop body). Warning: this may silently change the semantics of existing code.
* Type Checker: Disallow arithmetic operations for Boolean variables.
* Disallow trailing dots that are not followed by a number.
Language Features:
* General: Allow appending ``calldata`` keyword to types, to explicitly specify data location for arguments of external functions.

8
libsolidity/parsing/Scanner.cpp
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@ -768,8 +768,14 @@ Token::Value Scanner::scanNumber(char _charSeen)
scanDecimalDigits(); // optional
if (m_char == '.')
{
// A '.' has to be followed by a number.
if (m_source.isPastEndOfInput() || !isDecimalDigit(m_source.get(1)))
{
literal.complete();
return Token::Number;
}
addLiteralCharAndAdvance();
scanDecimalDigits(); // optional
scanDecimalDigits();
}
}
}

20
test/libsolidity/SolidityScanner.cpp
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@ -127,6 +127,26 @@ BOOST_AUTO_TEST_CASE(scientific_notation)
BOOST_CHECK_EQUAL(scanner.next(), Token::EOS);
}
BOOST_AUTO_TEST_CASE(trailing_dot)
{
Scanner scanner(CharStream("2.5"));
BOOST_CHECK_EQUAL(scanner.currentToken(), Token::Number);
BOOST_CHECK_EQUAL(scanner.next(), Token::EOS);
scanner.reset(CharStream("2.5e10"), "");
BOOST_CHECK_EQUAL(scanner.currentToken(), Token::Number);
BOOST_CHECK_EQUAL(scanner.next(), Token::EOS);
scanner.reset(CharStream(".5"), "");
BOOST_CHECK_EQUAL(scanner.currentToken(), Token::Number);
BOOST_CHECK_EQUAL(scanner.next(), Token::EOS);
scanner.reset(CharStream(".5e10"), "");
BOOST_CHECK_EQUAL(scanner.currentToken(), Token::Number);
BOOST_CHECK_EQUAL(scanner.next(), Token::EOS);
scanner.reset(CharStream("2."), "");
BOOST_CHECK_EQUAL(scanner.currentToken(), Token::Number);
BOOST_CHECK_EQUAL(scanner.next(), Token::Period);
BOOST_CHECK_EQUAL(scanner.next(), Token::EOS);
}
BOOST_AUTO_TEST_CASE(negative_numbers)
{
Scanner scanner(CharStream("var x = -.2 + -0x78 + -7.3 + 8.9 + 2e-2;"));

7
test/libsolidity/syntaxTests/parsing/trailing_dot1.sol Normal file
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@ -0,0 +1,7 @@
contract test {
uint256 a = 2.2e10;
uint256 b = .5E10;
uint256 c = 4.e-2;
}
// ----
// TypeError: (70-73): Member "e" not found or not visible after argument-dependent lookup in int_const 4

7
test/libsolidity/syntaxTests/parsing/trailing_dot2.sol Normal file
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@ -0,0 +1,7 @@
contract test {
uint256 a = 2.2e10;
uint256 b = .5E10;
uint256 c = 2 + 2.;
}
// ----
// ParserError: (76-77): Expected identifier but got ';'

4
test/libsolidity/syntaxTests/parsing/trailing_dot3.sol Normal file
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@ -0,0 +1,4 @@
contract test {
uint a = 2.
// ----
// ParserError: (29-29): Expected identifier but got end of source