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Fixed a code example in README

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yhirose 2020-08-26 21:47:19 -04:00
parent b3b29ce8f3
commit 11ed83e46f
1 changed files with 4 additions and 6 deletions
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README.md
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@ -177,20 +177,18 @@ struct SemanticValues : protected std::vector<any>
The following example uses `<` ... ` >` operator, which is *token boundary* operator.
```cpp
auto syntax = R"(
peg::parser parser(R"(
ROOT <- _ TOKEN (',' _ TOKEN)*
TOKEN <- < [a-z0-9]+ > _
_ <- [ \t\r\n]*
)";
)");
peg pg(syntax);
pg["TOKEN"] = [](const SemanticValues& sv) {
parser["TOKEN"] = [](const SemanticValues& sv) {
// 'token' doesn't include trailing whitespaces
auto token = sv.token();
};
auto ret = pg.parse(" token1, token2 ");
auto ret = parser.parse(" token1, token2 ");
```
We can ignore unnecessary semantic values from the list by using `~` operator.