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yhirose 2020-02-08 19:28:39 -05:00
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@ -21,11 +21,10 @@ The PEG syntax is well described on page 2 in the [document](http://www.brynosau
* `$name<` ... `>` (Named capture operator) * `$name<` ... `>` (Named capture operator)
* `$name` (Backreference operator) * `$name` (Backreference operator)
* `MACRO_NAME(` ... `)` (Parameterized rule or Macro) * `MACRO_NAME(` ... `)` (Parameterized rule or Macro)
* `{ precedence L - + L / * }` (Parsing infix expression)
This library supports the linear-time parsing known as the [*Packrat*](http://pdos.csail.mit.edu/~baford/packrat/thesis/thesis.pdf) parsing. This library supports the linear-time parsing known as the [*Packrat*](http://pdos.csail.mit.edu/~baford/packrat/thesis/thesis.pdf) parsing.
*Parsing infix expression by [Precedence climbing](https://eli.thegreenplace.net/2012/08/02/parsing-expressions-by-precedence-climbing)* algorithm is also supported.
IMPORTANT NOTE for some Linux distributions such as Ubuntu and CentOS: Need `-pthread` option when linking. See [#23](https://github.com/yhirose/cpp-peglib/issues/23#issuecomment-261126127), [#46](https://github.com/yhirose/cpp-peglib/issues/46#issuecomment-417870473) and [#62](https://github.com/yhirose/cpp-peglib/issues/62#issuecomment-492032680). IMPORTANT NOTE for some Linux distributions such as Ubuntu and CentOS: Need `-pthread` option when linking. See [#23](https://github.com/yhirose/cpp-peglib/issues/23#issuecomment-261126127), [#46](https://github.com/yhirose/cpp-peglib/issues/46#issuecomment-417870473) and [#62](https://github.com/yhirose/cpp-peglib/issues/62#issuecomment-492032680).
How to use How to use
@ -346,6 +345,8 @@ T(x) ← < x > _
Parsing infix expression by Precedence climbing Parsing infix expression by Precedence climbing
----------------------------------------------- -----------------------------------------------
Regarding the *precedence climbing algorithm*, please see [this article](https://eli.thegreenplace.net/2012/08/02/parsing-expressions-by-precedence-climbing).
```cpp ```cpp
parser parser(R"( parser parser(R"(
EXPRESSION <- INFIX_EXPRESSION(ATOM, OPERATOR) EXPRESSION <- INFIX_EXPRESSION(ATOM, OPERATOR)
@ -354,6 +355,7 @@ parser parser(R"(
NUMBER <- < '-'? [0-9]+ > NUMBER <- < '-'? [0-9]+ >
%whitespace <- [ \t]* %whitespace <- [ \t]*
# Declare order of precedence
INFIX_EXPRESSION(A, O) <- A (O A)* { INFIX_EXPRESSION(A, O) <- A (O A)* {
precedence precedence
L + - L + -