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README.md
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@ -14,7 +14,7 @@
![windows-msys2-gcc](https://github.com/red0124/ssp/workflows/win-msys2-gcc-ci/badge.svg) ![windows-msys2-gcc](https://github.com/red0124/ssp/workflows/win-msys2-gcc-ci/badge.svg)
![windows-msys2-clang](https://github.com/red0124/ssp/workflows/win-msys2-clang-ci/badge.svg) ![windows-msys2-clang](https://github.com/red0124/ssp/workflows/win-msys2-clang-ci/badge.svg)
A header only "csv" parser which is fast and versatile with modern C++ api. Requires compiler with C++17 support. A header only "csv" parser which is fast and versatile with modern C++ api. Requires compiler with C++17 support. Can also be used to convert strings to values.
Conversion for floating point values invoked using [fast-float](https://github.com/fastfloat/fast_float) . Conversion for floating point values invoked using [fast-float](https://github.com/fastfloat/fast_float) .
Function traits taken from [qt-creator](https://code.woboq.org/qt5/qt-creator/src/libs/utils/functiontraits.h.html) . Function traits taken from [qt-creator](https://code.woboq.org/qt5/qt-creator/src/libs/utils/functiontraits.h.html) .
@ -34,7 +34,7 @@ Bill (Heath) Gates,65,3.3
#include <ss/parser.hpp> #include <ss/parser.hpp>
int main() { int main() {
ss::parser p{"students.csv", ","}; ss::parser p{"students.csv"};
if (!p.valid()) { if (!p.valid()) {
exit(EXIT_FAILURE); exit(EXIT_FAILURE);
} }
@ -60,8 +60,10 @@ Bill (Heath) Gates 65 3.3
# Features # Features
* Works on any type * Works on any type
* Easy to use * Easy to use
* Fast
* No exceptions * No exceptions
* Works with quotes, escapes and spacings * Works with quotes, escapes and spacings
* Works with values containing new lines
* Columns and rows can be ignored * Columns and rows can be ignored
* Works with any type of delimiter * Works with any type of delimiter
* Can return whole objects composed of converted values * Can return whole objects composed of converted values
@ -70,7 +72,6 @@ Bill (Heath) Gates 65 3.3
* Works with `std::optional` and `std::variant` * Works with `std::optional` and `std::variant`
* Works with **CRLF** and **LF** * Works with **CRLF** and **LF**
* Conversions can be chained if invalid * Conversions can be chained if invalid
* Fast
# Installation # Installation
@ -135,6 +136,33 @@ auto s = p.get_next<student>();
``` ```
*Note, the order in which the members of the tied method are returned must match the order of the elements in the csv* *Note, the order in which the members of the tied method are returned must match the order of the elements in the csv*
### Setup
By default, many of the features supported by the parser a disabled. They can be enabled within the template parameters of the parser. For example, to enable quoting
and escaping the parser would look like:
```cpp
ss::parser<ss::quote<'"'>, ss::escape<'\\'>> p0{file_name};
```
The order of the defined setup parameters is not important:
```cpp
// equivalent to p0
ss::parser<ss::escape<'\\'>, ss::quote<'"'>> p1{file_name};
```
The setup can also be predefined:
```cpp
using my_setup = ss::setup<ss::escape<'\\'>, ss::quote<'"'>>;
// equivalent to p0 and p1
ss::parser<my_setup> p1{file_name};
```
## Quoting
Not yet documented.
## Escaping
Not yet documented.
## Spacing
Not yet documented.
### Special types ### Special types
Passing **void** makes the parser ignore a column. In the given example **void** could be given as the second template parameter to ignore the second (age) column in the csv, a tuple of only 2 parameters would be retuned: Passing **void** makes the parser ignore a column. In the given example **void** could be given as the second template parameter to ignore the second (age) column in the csv, a tuple of only 2 parameters would be retuned:
@ -234,15 +262,6 @@ inline bool ss::extract(const char* begin, const char* end, shape& dst) {
``` ```
The shape enum will be used in an example below. The **inline** is there just to prevent multiple definition errors. The function returns **true** if the conversion was a success, and **false** otherwise. The function uses **const char*** begin and end for performance reasons. The shape enum will be used in an example below. The **inline** is there just to prevent multiple definition errors. The function returns **true** if the conversion was a success, and **false** otherwise. The function uses **const char*** begin and end for performance reasons.
## Quoting
Not yet documented.
## Escaping
Not yet documented.
## Spacing
Not yet documented.
## Error handling ## Error handling
Detailed error messages can be accessed via the **error_msg** method, and to enable them ss::string_error needs to be included in the setup. Detailed error messages can be accessed via the **error_msg** method, and to enable them ss::string_error needs to be included in the setup.