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Added more information about the ignore operator.

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yhirose 2015-06-13 01:27:49 -04:00
parent 38ba5e1a5e
commit 36e58a6c7b
1 changed files with 13 additions and 3 deletions
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README.md
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@ -144,9 +144,9 @@ We can ignore unnecessary semantic values from the list by using `~` operator.
```c++ ```c++
peglib::peg parser( peglib::peg parser(
" ROOT <- _ ITEM (',' _ ITEM _)* " " ROOT <- _ ITEM (',' _ ITEM _)* "
" ITEM <- ([a-z])+ " " ITEM <- ([a-z])+ "
" ~_ <- [ \t]* " " ~_ <- [ \t]* "
); );
parser["ROOT"] = [&](const SemanticValues& sv) { parser["ROOT"] = [&](const SemanticValues& sv) {
@ -156,6 +156,16 @@ parser["ROOT"] = [&](const SemanticValues& sv) {
auto ret = parser.parse(" item1, item2 "); auto ret = parser.parse(" item1, item2 ");
``` ```
The following grammar is same as the above.
```c++
peglib::peg parser(
" ROOT <- ~_ ITEM (',' ~_ ITEM ~_)* "
" ITEM <- ([a-z])+ "
" _ <- [ \t]* "
);
```
Simple interface Simple interface
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