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Fix parsing of operators

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* Only parse valid operators
 * Don't swallow a symbol if it would produce an invalid operator

Closes #198
This commit is contained in:
Jason Turner
2015-08-01 10:05:38 -06:00
parent 9d17b18f26
commit 0c4951d742
1 changed files with 16 additions and 2 deletions
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18
include/chaiscript/language/chaiscript_parser.hpp
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@@ -1222,6 +1222,16 @@ namespace chaiscript
return false;
}
bool is_operator(const std::string &t_s) const {
return std::any_of(m_operator_matches.begin(), m_operator_matches.end(),
[t_s](const std::vector<std::string> &opers) {
return std::any_of(opers.begin(), opers.end(),
[t_s](const std::string &s) {
return s == t_s;
});
});
}
/// Reads (and potentially captures) a symbol group from input if it matches the parameter
bool Symbol(const char *t_s, const bool t_capture = false, const bool t_disallow_prevention=false) {
SkipWS();
@@ -1230,8 +1240,12 @@ namespace chaiscript
// ignore substring matches
if (retval && m_position.has_more() && (t_disallow_prevention == false) && char_in_alphabet(*m_position,detail::symbol_alphabet)) {
m_position = start;
retval = false;
if (*m_position != '=' && is_operator(Position::str(start, m_position)) && !is_operator(Position::str(start, m_position+1))) {
// don't throw this away, it's a good match and the next is not
} else {
m_position = start;
retval = false;
}
}
if ( t_capture && retval ) {