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Lexer: Added comments

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This commit is contained in:
Paul Beckingham 2015-03-20 17:16:00 -04:00
parent 11dab68fce
commit 289780c8cc
2 changed files with 5 additions and 5 deletions
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6
src/Lexer.cpp
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@ -608,6 +608,7 @@ bool Lexer::isNumber (std::string& token, Lexer::Type& type)
}
}
// Lookahread: !<isWhitespace> | !<isSingleCharOperator>
// If there is an immediately consecutive character, that is not an operator, fail.
if (_eos > marker &&
! isWhitespace (_text[marker]) &&
@ -753,9 +754,7 @@ bool Lexer::isTag (std::string& token, Lexer::Type& type)
{
std::size_t marker = _cursor;
// This test requires a tag to have a preceding space or start a string.
// bad: 'a+b' --> identifier tag
// good: 'a+b' --> identifier op identifier
// Lookbehind: ^ | <isWhiteSpace>
if (marker > 0 &&
! isWhitespace (_text[marker - 1]))
return false;
@ -844,6 +843,7 @@ bool Lexer::isSubstitution (std::string& token, Lexer::Type& type)
if (_text[_cursor] == 'g')
++_cursor;
// Lookahread: <isWhitespace>
if (isWhitespace (_text[_cursor]))
{
token = _text.substr (marker, _cursor - marker);