Package 'nirs4allformats.lite'

Build a wide data frame from a dataset

Description

as.data.frame() method for nirs4allformats_dataset objects. Returns a wide table whose first column is sample_id, followed by any target columns, followed by one spectral column per wavelength. Spectral columns are named x_<wavelength> (the axis value formatted without scientific notation).

Usage

## S3 method for class 'nirs4allformats_dataset'
as.data.frame(x, row.names = NULL, optional = FALSE, ...)

Arguments

x	An nirs4allformats_dataset from nirs4allformats_open_dataset().
row.names	Ignored; present for S3 method signature compatibility.
optional	Ignored; present for S3 method signature compatibility.
...	Ignored; present for S3 method consistency.

Value

A data.frame with columns sample_id, the target columns (if any), and x_<wavelength> spectral columns.

See Also

nirs4allformats_open_dataset(), as.matrix.nirs4allformats_dataset(), nirs4allformats_as_tibble().

Examples

## Not run: 
ds <- nirs4allformats_open_dataset("samples/csv_tsv/synthetic_nirs.csv")
df <- as.data.frame(ds)
names(df)[1:5]

## End(Not run)

---

Extract the spectral matrix from a dataset

Description

as.matrix() method for nirs4allformats_dataset objects. Returns the stored n_samples x n_wavelengths numeric matrix of spectra. Rows correspond to x$sample_ids and columns to x$wavelengths.

Usage

## S3 method for class 'nirs4allformats_dataset'
as.matrix(x, ...)

Arguments

x	An nirs4allformats_dataset from nirs4allformats_open_dataset().
...	Ignored; present for S3 method consistency.

Value

A numeric matrix with one row per sample and one column per wavelength.

See Also

nirs4allformats_open_dataset(), as.data.frame.nirs4allformats_dataset().

Examples

## Not run: 
ds <- nirs4allformats_open_dataset("samples/csv_tsv/synthetic_nirs.csv")
m <- as.matrix(ds)
dim(m)

## End(Not run)

---

Convert a dataset to a tibble

Description

Convenience wrapper that converts an nirs4allformats_dataset to a tibble via as.data.frame.nirs4allformats_dataset(). The optional tibble package must be installed.

Usage

nirs4allformats_as_tibble(dataset)

Arguments

dataset

An nirs4allformats_dataset from nirs4allformats_open_dataset().

Value

A tibble::tibble with the same columns as as.data.frame.nirs4allformats_dataset() (sample_id, target columns, x_<wavelength> spectral columns).

See Also

nirs4allformats_open_dataset(), as.data.frame.nirs4allformats_dataset().

Examples

## Not run: 
ds <- nirs4allformats_open_dataset("samples/csv_tsv/synthetic_nirs.csv")
nirs4allformats_as_tibble(ds)

## End(Not run)

---

Report whether the native Rust backend is loaded

Description

Returns TRUE when the compiled extendr static library is registered in the running R session, i.e. the package was installed with Cargo on PATH and the Rust core is callable directly. When FALSE, filesystem reads fall back to the nirs4all-formats CLI, and the in-memory paths (nirs4allformats_open_bytes(), nirs4allformats_open_with_sidecars()) are unavailable.

Usage

nirs4allformats_native_available()

Value

A length-one logical: TRUE if the native backend is loaded, otherwise FALSE.

See Also

nirs4allformats_open_bytes(), nirs4allformats_open_with_sidecars().

Examples

## Not run: 
if (nirs4allformats_native_available()) {
  message("native extendr backend active")
} else {
  message("using nirs4all-formats CLI fallback")
}

## End(Not run)

---

Decode raw bytes through the native registry

Description

Decodes an in-memory byte buffer through the Rust registry and returns the normalized records as nested R lists, without touching the filesystem. The name drives extension-based sniffing and provenance. This path requires the native extendr static library; it is unavailable through the CLI fallback and raises an error when the native library is absent.

Formats that need companion files (sidecars) are rejected here; use nirs4allformats_open_with_sidecars() for those.

Usage

nirs4allformats_open_bytes(name, bytes)

Arguments

name	Character scalar. Logical file name (with extension) used for format sniffing and recorded in provenance, e.g. "spectrum.dx".
bytes	A raw vector containing the file contents.

Value

A list of records, identical in shape to nirs4allformats_open_records().

See Also

nirs4allformats_open_with_sidecars(), nirs4allformats_open_records(), nirs4allformats_native_available().

Examples

## Not run: 
bytes <- readBin("spectrum.dx", what = "raw",
                 n = file.info("spectrum.dx")$size)
records <- nirs4allformats_open_bytes("spectrum.dx", bytes)

## End(Not run)

---

Read a spectroscopy file into a flat spectral dataset

Description

Loads a file with nirs4allformats_open_records() and projects one signal per record into a rectangular, R-friendly dataset: a samples-by-wavelengths matrix plus sample IDs, targets and metadata. All records must share the same spectral axis (an error is raised otherwise), so this is intended for a homogeneous set of spectra. For heterogeneous or N-dimensional data, work from nirs4allformats_open_records() directly.

Parsing happens only in Rust; the R layer just selects a signal and reshapes the JSON the core returns.

Usage

nirs4allformats_open_dataset(path, signal = NULL)

Arguments

path	Character scalar. Path to the input file (resolved with normalizePath(), mustWork = TRUE).
signal	Optional character scalar naming the signal channel to project. When NULL (default) the channel is auto-selected (see Signal selection).

Value

An object of class nirs4allformats_dataset: a named list with

x

Numeric matrix of spectra, n_samples x n_wavelengths.

wavelengths

Numeric vector of axis coordinates (length n_wavelengths).

targets

data.frame of reference values, one column per target key (zero columns when none were parsed).

sample_ids

Character vector of per-row identifiers.

metadata

List of per-record metadata lists.

signal_type

Signal type of the selected channel.

axis_unit

Unit string of the spectral axis (e.g. "nm").

formats

Character vector of the source format per row.

Use as.matrix() / as.data.frame() / nirs4allformats_as_tibble() to project it into common R shapes.

Signal selection

When signal is NULL the channel is chosen per record in this order:

1. the first signal whose signal_type equals the record-level signal_type;

2. otherwise the first present of "reflectance", "absorbance", "transmittance", "signal";

3. otherwise the alphabetically first signal name.

Passing an explicit signal name selects that channel and errors if a record lacks it.

Sample IDs

Each row's identifier is taken from metadata$sample_id when present; otherwise it is derived from the source file basename and 0-based row index ("<basename>:<i>"), falling back to "record:<i>" when no source path is known.

Targets and metadata

Reference values found under each record's targets are gathered into a data.frame (missing values become NA). The full per-record metadata lists are preserved verbatim in the metadata field of the returned object.

Transport

The call is served by the native extendr static library when it is present (built by R CMD INSTALL with Cargo on PATH). Otherwise it shells out to the nirs4all-formats CLI: the NIRS4ALL_FORMATS_CLI environment variable may point to a prebuilt binary (it is whitespace-split into command + arguments), a nirs4all-formats binary on PATH is used if found, and in a source checkout it falls back to cargo run -p nirs4all-formats-cli.

See Also

nirs4allformats_open_records() for the lossless record view, as.matrix.nirs4allformats_dataset(), as.data.frame.nirs4allformats_dataset(), nirs4allformats_as_tibble().

Examples

## Not run: 
ds <- nirs4allformats_open_dataset("samples/csv_tsv/synthetic_nirs.csv")
dim(as.matrix(ds))
head(as.data.frame(ds))
ds$wavelengths[1:5]

# Select a specific channel by name
ds_abs <- nirs4allformats_open_dataset("spectrum.dx", signal = "absorbance")

## End(Not run)

---

Read a spectroscopy file into normalized records

Description

Decodes a single file through the Rust nirs4all-formats registry and returns the normalized records exactly as the core emits them, as nested R lists. Format detection is content-based: the file is sniffed and dispatched to the highest-confidence reader. No reshaping, alignment or column-building is done here – this is the faithful, lossless view of the Rust SpectralRecord model. For a flat spectral matrix use nirs4allformats_open_dataset().

Parser logic lives only in Rust; this function never parses bytes itself. It dispatches through the native extendr library when available and otherwise through the nirs4all-formats CLI (see Transport in nirs4allformats_open_dataset()).

Usage

nirs4allformats_open_records(path)

Arguments

path	Character scalar. Path to the input file. It is resolved with normalizePath() (mustWork = TRUE), so the file must exist.

Value

A list of records. Each record is a named list mirroring the Rust SpectralRecord:

signals

Named list of signal channels. Each channel carries values (flat C-order buffer), shape, dims (exactly one is "x"), optional coords, signal_type, unit, role, source and an axis (values, unit, kind, order).

signal_type

Record-level signal type (e.g. "absorbance", "reflectance", "unknown").

targets

Named list of reference values parsed from the file.

metadata

Named list of typed metadata key/value pairs.

provenance

Reader name/version, per-source SHA-256 (sources), format, record_schema_version and warnings.

quality_flags

Character vector of quality annotations.

See Also

nirs4allformats_open_dataset() for a flat matrix view, nirs4allformats_probe_path() to inspect candidate readers, nirs4allformats_walk_path() to scan a directory.

Examples

## Not run: 
records <- nirs4allformats_open_records("samples/csv_tsv/synthetic_nirs.csv")
length(records)
records[[1]]$provenance$format
names(records[[1]]$signals)

## End(Not run)

---

Decode raw bytes with companion sidecar files

Description

Decodes an in-memory primary buffer together with a named map of companion files (sidecars) through the Rust registry, returning normalized records as nested R lists. This serves formats that split a measurement across multiple files, such as ENVI Standard cubes (.img + .hdr) or ERDAS LAN. Sidecar names are interpreted as paths relative to the primary file.

This path requires the native extendr static library and raises an error when it is absent; it has no CLI fallback.

Usage

nirs4allformats_open_with_sidecars(name, bytes, sidecars = list())

Arguments

name	Character scalar. Logical file name of the primary file (with extension), used for sniffing and provenance, e.g. "cube.img".
bytes	A raw vector with the primary file contents.
sidecars	A named list of raw vectors. Each name is a companion file path relative to the primary file (e.g. "cube.hdr"); each value is that file's bytes. Defaults to an empty list.

Value

A list of records, identical in shape to nirs4allformats_open_records().

See Also

nirs4allformats_open_bytes(), nirs4allformats_open_records(), nirs4allformats_native_available().

Examples

## Not run: 
read_raw <- function(p) readBin(p, "raw", n = file.info(p)$size)
records <- nirs4allformats_open_with_sidecars(
  "cube.img",
  read_raw("cube.img"),
  list("cube.hdr" = read_raw("cube.hdr"))
)

## End(Not run)

---

List candidate readers for a file

Description

Sniffs a file (reading only its head, not a full parse) and returns the ordered list of readers that recognize it, highest confidence first. Useful for diagnosing format detection without decoding the whole file.

Sniffing is performed entirely in Rust. The native extendr library is used when present; otherwise the nirs4all-formats probe CLI command is invoked (see Transport in nirs4allformats_open_dataset()).

Usage

nirs4allformats_probe_path(path)

Arguments

path	Character scalar. Path to the file to probe (resolved with normalizePath(), mustWork = TRUE).

Value

A list of candidate descriptors. Each entry includes at least a format name and a confidence indication, ordered from most to least confident. The list is empty when no reader recognizes the file.

See Also

nirs4allformats_open_records(), nirs4allformats_walk_path().

Examples

## Not run: 
probes <- nirs4allformats_probe_path("samples/csv_tsv/synthetic_nirs.csv")
probes[[1]]$format

## End(Not run)

---

Report the nirs4allformats binding version

Description

Returns the version of the nirs4allformats R binding as a character scalar. This is the binding's own version and is independent of the underlying Rust nirs4all-formats core version.

Usage

nirs4allformats_version()

Value

A length-one character vector with the binding version.

See Also

nirs4allformats_native_available().

Examples

nirs4allformats_version()

---

Walk a directory and report per-file outcomes

Description

Recursively visits a directory (or a single file) and reports the detection outcome for each visited file: whether it parsed, errored, or is unsupported, together with its detected format. Only sniffing and walking happen here; no file is fully decoded.

The walk runs in Rust. The native extendr library is used when present; otherwise the nirs4all-formats scan --json CLI command is invoked and its entries are returned (see Transport in nirs4allformats_open_dataset()).

Usage

nirs4allformats_walk_path(
  path,
  max_depth = NULL,
  include_hidden = FALSE,
  follow_symlinks = FALSE,
  include_unsupported = FALSE
)

Arguments

path	Character scalar. Directory or file to scan (resolved with normalizePath(), mustWork = TRUE).
max_depth	Optional integer. Maximum recursion depth; NULL (default) means unlimited.
include_hidden	Logical. Include hidden files/directories. Defaults to FALSE.
follow_symlinks	Logical. Follow symbolic links during the walk. Defaults to FALSE.
include_unsupported	Logical. Include entries for files no reader recognizes. Defaults to FALSE.

Value

A list of per-file outcome entries. Each entry includes at least a status (e.g. "parsed", "error", "unsupported") and, when detected, a format.

See Also

nirs4allformats_probe_path(), nirs4allformats_open_records().

Examples

## Not run: 
entries <- nirs4allformats_walk_path("samples/asd")
length(entries)
entries[[1]]$status
entries[[1]]$format

# Limit recursion depth and include unsupported files
nirs4allformats_walk_path("samples", max_depth = 1, include_unsupported = TRUE)

## End(Not run)

---