time-to-botec

README.md (6523B)

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 # Add-on Arguments
 
 > C API for validating, extracting, and transforming (to native C types) function arguments provided to a strided array Node-API add-on interface.
 
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 ## Usage
 
 ```javascript
 var headerDir = require( '@stdlib/strided/napi/addon-arguments' );
 ```
 
 #### headerDir
 
 Absolute file path for the directory containing header files for C APIs.
 
 ```javascript
 var dir = headerDir;
 // returns <string>
 ```
 
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 ## Examples
 
 ```javascript
 var headerDir = require( '@stdlib/strided/napi/addon-arguments' );
 
 console.log( headerDir );
 // => <string>
 ```
 
 </section>
 
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 * * *
 
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 ## C APIs
 
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 ### Usage
 
 ```c
 #include "stdlib/strided/napi/addon_arguments.h"
 ```
 
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 #### stdlib_strided_napi_addon_arguments( env, argv, nargs, nin, \*arrays[], \*shape, \*strides, \*types, \*err )
 
 Validates, extracts, and transforms (to native C types) function arguments provided to a strided array Node-API add-on interface.
 
 ```c
 #include <node_api.h>
 #include <stdint.h>
 #include <assert.h>
 
 // ...
 
 /**
 * Receives JavaScript callback invocation data.
 *
 * @param env    environment under which the function is invoked
 * @param info   callback data
 * @return       Node-API value
 */
 napi_value addon( napi_env env, napi_callback_info info ) {
     napi_status status;
 
     // ...
 
     int64_t nargs = 7;
     int64_t nin = 2;
 
     // Get callback arguments:
     size_t argc = 7;
     napi_value argv[ 7 ];
     status = napi_get_cb_info( env, info, &argc, argv, NULL, NULL );
     assert( status == napi_ok );
 
     // ...
 
     // Initialize destination arrays:
     uint8_t *arrays[ 3 ];
     int64_t strides[ 3 ];
     int64_t shape[ 1 ];
     int32_t types[ 3 ];
 
     // Process the provided arguments:
     napi_value err;
     status = stdlib_strided_napi_addon_arguments( env, argv, nargs, nin, arrays, shape, strides, types, &err );
     assert( status == napi_ok );
 
     // ...
 
 }
 
 // ...
 ```
 
 The function accepts the following arguments:
 
 -   **env**: `[in] napi_env` environment under which the function is invoked.
 -   **argv**: `[in] napi_value*` strided function arguments.
 -   **nargs**: `[in] int64_t` total number of expected arguments.
 -   **nin**: `[in] int64_t` number of input strided array arguments.
 -   **arrays**: `[out] uint8_t**` destination array for storing pointers to both input and output strided byte arrays.
 -   **shape**: `[out] int64_t*` destination array for storing the array shape (dimensions).
 -   **strides**: `[out] int64_t*` destination array for storing array strides (in bytes) for each strided array.
 -   **types**: `[out] int32_t*` destination array for storing strided array argument data types.
 -   **err**: `[out] napi_value*` pointer for storing a JavaScript error.
 
 ```c
 napi_status stdlib_strided_napi_addon_arguments( const napi_env env, const napi_value *argv, const int64_t nargs, const int64_t nin, uint8_t *arrays[], int64_t *shape, int64_t *strides, int32_t *types, napi_value *err );
 ```
 
 The function returns a `napi_status` status code indicating success or failure (returns `napi_ok` if success).
 
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 ### Notes
 
 -   The function assumes the following argument order:
 
     ```text
     [ N, ia1, is1, ia2, is2, ..., oa1, os1, oa2, os2, ... ]
     ```
 
     where
 
     -   `N` is the number of elements over which to iterate.
     -   `ia#` is an input strided array.
     -   `is#` is a corresponding input strided array stride (in units of elements).
     -   `oa#` is an output strided array.
     -   `os#` is a corresponding output strided array stride (in units of elements).
 
 -   The function may return one of the following JavaScript errors:
 
     -   `TypeError`: first argument must be an integer.
     -   `TypeError`: input array stride argument must be an integer.
     -   `TypeError`: output array stride argument must be an integer.
     -   `TypeError`: input array argument must be a typed array.
     -   `TypeError`: output array argument must be a typed array.
     -   `RangeError`: input array argument must have sufficient elements based on the associated stride and the number of indexed elements.
     -   `RangeError`: output array argument must have sufficient elements based on the associated stride and the number of indexed elements.
 
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