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Updated README

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yhirose 2016-06-02 17:49:09 -04:00
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@ -349,39 +349,6 @@ The following are available operators:
| tok | Token boundary | | tok | Token boundary |
| ign | Ignore semantic value | | ign | Ignore semantic value |
| cap | Capture character | | cap | Capture character |
| usr | User defined parser |
Adjust definitions
------------------
It's possible to add/override definitions.
```cpp
auto syntax = R"(
ROOT <- _ 'Hello' _ NAME '!' _
)";
Rules additional_rules = {
{
"NAME", usr([](const char* s, size_t n, SemanticValues& sv, any& dt) -> size_t {
static vector<string> names = { "PEG", "BNF" };
for (const auto& name: names) {
if (name.size() <= n && !name.compare(0, name.size(), s, name.size())) {
return name.size(); // processed length
}
}
return -1; // parse error
})
},
{
"~_", zom(cls(" \t\r\n"))
}
};
auto g = parser(syntax, additional_rules);
assert(g.parse(" Hello BNF! "));
```
Unicode support Unicode support
--------------- ---------------