Type:	Package
Title:	Interface to the 'PubChem' Database for Chemical Data Retrieval
Version:	3.0.0
Author:	Selcuk Korkmaz [aut, cre], Bilge Eren Yamasan [aut], Dincer Goksuluk [aut]
Maintainer:	Selcuk Korkmaz <selcukorkmaz@gmail.com>
Description:	Provides an interface to the 'PubChem' database via the PUG REST https://pubchem.ncbi.nlm.nih.gov/docs/pug-rest and PUG View https://pubchem.ncbi.nlm.nih.gov/docs/pug-view services. This package allows users to automatically access chemical and biological data from 'PubChem', including compounds, substances, assays, and various other data types. Functions are available to retrieve data in different formats, perform searches, and access detailed annotations.
License:	GPL-2 | GPL-3 [expanded from: GPL (≥ 2)]
Encoding:	UTF-8
RoxygenNote:	7.3.3
URL:	https://selcukorkmaz.github.io/pubchemr-tutorial/, https://github.com/selcukorkmaz/PubChemR
BugReports:	https://github.com/selcukorkmaz/PubChemR/issues
Imports:	dplyr, tibble, magrittr, stringr, tidyr, RJSONIO, httr, utils
Suggests:	magick, rsvg, png, testthat (≥ 3.0.0), Matrix, knitr, rmarkdown
Config/testthat/edition:	3
NeedsCompilation:	no
Packaged:	2026-03-07 00:20:27 UTC; selcuk
Repository:	CRAN
Date/Publication:	2026-03-07 00:30:02 UTC

Assay, Compound, and Substance Identifiers

Description

These functions are used to retrieve identification information for assays, substances, and compounds from the PubChem database.

Usage

AIDs(object, ...)

CIDs(object, ...)

SIDs(object, ...)

## S3 method for class 'PubChemInstance_AIDs'
AIDs(object, .to.data.frame = TRUE, ...)

## S3 method for class 'PubChemInstance_CIDs'
CIDs(object, .to.data.frame = TRUE, ...)

## S3 method for class 'PubChemInstance_SIDs'
SIDs(object, .to.data.frame = TRUE, ...)

Arguments

Details

The generic dispatches to class-specific methods and returns either a compact identifier table (.to.data.frame = TRUE) or raw nested payloads.

Value

A tibble (default) or list containing mapped identifier outputs.

Examples

# Retrieve Assay IDs
aids <- get_aids(identifier = c("aspirin", "caffeine"), namespace = "name")
AIDs(aids)



# Compound IDs
cids <- get_cids(identifier = c("aspirin", "caffein"), namespace = "name")
CIDs(cids)



# Substance IDs
sids <- get_sids(identifier = c("aspirin", "caffein"), namespace = "name")
SIDs(sids)

PubChemInstanceList and PubChemInstance Classes

Description

The PubChemInstanceList object is a superclass returned by a request for compound(s) from the PubChem Database, such as the output from get_compounds, get_assays, etc.

The PubChemInstance object is another superclass for a PubChem instance, such as an assay, compound, substance, etc. These instances are nested within the results slot of a PubChemInstanceList object. Similar to PubChemInstanceList, the PubChemInstance also contains the same slots as described below. For more details, see instance.

Slots

results:

A list containing elements of each of the requested compounds, assays, substances, etc.

request_args:

A list containing the input arguments of a PubChem request.

success:

A logical value indicating whether the request was successfully completed (TRUE) or not (FALSE).

error:

A list detailing any errors encountered during the request, if applicable.

Note

There is no constructor function for the PubChemInstanceList or PubChemInstance classes. These objects are constructed within related functions and returned as the output of PubChem requests.

There are several subclasses defined under the PubChemInstanceList and PubChemInstance superclasses. The PubChem API returns request results in a list; however, each request may have a different list structure and/or items within the returned list. Therefore, we have defined subclasses to make generic functions compatible with any PubChem request, such as assays, instances, substances, etc. These subclasses may include PC_Compounds, PC_Substance, PC_Properties, PubChemInstance_AIDs, PubChemInstance_SIDs, PubChemInstance_CIDs, PubChemInstance_Synonyms, and PubChemInstance_Substances.

Most of the defined subclasses have similar slots as described above. However, some classes may have additional slots not described here. Please refer to the contents of the returned object for more details.

Classes for Pug View Request

Description

The Pug View API of PubChem database returns more detailed information about a PubChem request, such as assays, compounds, substances, etc. A super-class PugViewInstance is defined, which is returned from get_pug_view function. This class has slots detailed below.

Slots

results:

A list containing elements of each of the requested compounds, assays, substances, etc.

request_args:

A list containing the input arguments of a PubChem request.

success:

A logical value indicating whether the request was successfully completed (TRUE) or not (FALSE).

error:

A list detailing any errors encountered during the request, if applicable.

Note

Pug View API returns many section about the requested instance, which includes detailed information from PubChem database. There may be many nested sections, where each contains details about different features of the instance requested. These sections can be listed via sectionList function.

Other classes, called PugViewSectionList and PugViewSection, are defined to control the outputs of available sections and sub-sections returned from get_pug_view. See related functions for details.

See Also

section, sectionList

Download Content from PubChem and Save to a File

Description

This function sends a request to PubChem to retrieve content in the specified format for a given identifier. It then writes the content to a specified file path.

Usage

download(
  filename = NULL,
  outformat,
  path,
  identifier,
  namespace = "cid",
  domain = "compound",
  operation = NULL,
  searchtype = NULL,
  overwrite = FALSE,
  options = NULL
)

Arguments

Details

'download()' is a convenience wrapper around get_pubchem() for file-oriented workflows. The returned payload is written as bytes, so both text and binary outputs can be handled.

Value

No return value. The function writes the content to the specified file path and prints a message indicating the save location.

Examples

# Download JSON file for the compound "aspirin" into "Aspirin.JSON"
# A folder named "Compound" will be created under current directory"
download(
  filename = "Aspirin",
  outformat = "json",
  path = "./Compound",
  identifier = "aspirin",
  namespace = "name",
  domain = "compound",
  overwrite = TRUE
)

# Remove downloaded files and folders.
file.remove("./Compound/Aspirin.json")
file.remove("./Compound/")

Retrieve Assay IDs (AIDs) from PubChem

Description

This function queries the PubChem database to retrieve Assay IDs (AIDs) based on a given identifier.

Usage

get_aids(
  identifier,
  namespace = "cid",
  domain = "compound",
  searchtype = NULL,
  options = NULL
)

Arguments

Details

For more detailed information, please refer to the PubChem PUG REST API documentation.

Value

An object of class 'PubChemInstance_AIDs', which is a list containing information retrieved from the PubChem database. Assay IDs can be extracted from the returned object using the getter function AIDs.

Note

To extract assay IDs from returned object, one may use AIDs function. See examples.

See Also

AIDs, get_pug_rest

Examples

# Request for multiple assays
# If assay identifier is unknown or incorrect, an error returns from PubChem Database
aids <- get_aids(
  identifier = c("aspirin", "ibuprofen", "rstudio"),
  namespace = "name"
)

print(aids)

# Return all Assay IDs.
AIDs(aids)

Retrieve All Sources from PubChem

Description

This function retrieves a list of all current depositors of substances or assays from PubChem.

Usage

get_all_sources(domain = "substance")

Arguments

Details

The PubChem PUG REST API provides a way to retrieve all current depositors (sources) for substances or assays. For more detailed information, please refer to the PubChem Data Sources documentation.

Value

A character vector containing the names of all sources for the specified domain.

Examples

get_all_sources(
  domain = 'substance'
)

Retrieve Assays from PubChem

Description

This function sends a request to PubChem to retrieve assay data based on the specified parameters.

Usage

get_assays(identifier, namespace = "aid", operation = NULL, options = NULL)

Arguments

Details

For more detailed information, please refer to the PubChem PUG REST API documentation.

Value

An object of class 'PubChemInstanceList' containing the information retrieved from the PubChem database.

Note

To extract information about a specific assay from the returned list, use the instance function.

Each assay may include information on several properties. Specific information from the assay can be extracted using the retrieve function. See examples.

See Also

retrieve, instance

Examples

# Retrieve a list of assays from the PubChem database
assays <- get_assays(
  identifier = c(1234, 7815),
  namespace = 'aid'
)

# Return assay information for assay ID '1234'
assay1234 <- instance(assays, "1234")
print(assay1234)

# Retrieve specific elements from the assay output
retrieve(assay1234, "aid")

Retrieve "Biological Test Results" Section from PubChem Contents

Description

This helper fetches a PUG View record and extracts section(s) with heading '"Biological Test Results"' (or a custom heading) from the PubChem 'CONTENTS' structure.

Usage

get_biological_test_results(
  identifier,
  domain = "compound",
  heading = "Biological Test Results",
  .match_type = c("match", "contain"),
  .all = FALSE,
  .verbose = FALSE,
  ...
)

Arguments

Details

This is a targeted utility built on top of get_pug_view, retrieve, and sectionList to simplify extraction of deeply nested biological testing sections from PUG View records.

Value

A PugViewSection object (default) or PugViewSectionList when .all = TRUE. If no section is found, a failed PugViewSection object is returned with error details.

Examples

bio <- get_biological_test_results(identifier = "2244", domain = "compound")
bio

# Return all matching sections (if multiple are present)
bio_all <- get_biological_test_results(
  identifier = "2244",
  domain = "compound",
  .all = TRUE
)
bio_all

Retrieve Compound IDs (CIDs) from PubChem

Description

This function sends a request to PubChem to retrieve Compound IDs (CIDs) for given identifier(s).

Usage

get_cids(
  identifier,
  namespace = "name",
  domain = "compound",
  searchtype = NULL,
  options = NULL
)

Arguments

Details

For more detailed information, please refer to the PubChem PUG REST API documentation.

Value

An object of class 'PubChemInstance_CIDs', which is a list containing information retrieved from the PubChem database. Compound IDs can be extracted from the returned object using the CIDs function.

Note

To extract compoud IDs from returned object, one may use CIDs function. See examples.

See Also

CIDs, get_pug_rest

Examples

compound <- get_cids(
  identifier = "aspirin",
  namespace = "name"
)

compound

# Extract compound IDs.
CIDs(compound)

Retrieve Compounds from PubChem

Description

This function sends a request to the PubChem database to retrieve compound data based on specified parameters.

Usage

get_compounds(
  identifier,
  namespace = "cid",
  operation = NULL,
  searchtype = NULL,
  options = NULL
)

Arguments

Details

For more detailed information, please refer to the PubChem PUG REST API documentation.

Value

An object of class 'PubChemInstanceList' and 'PC_Compounds' containing compound information from the PubChem database.

See Also

retrieve, instance

Examples

compound <- get_compounds(
  identifier = c("aspirin", "ibuprofen", "rstudio"),
  namespace = "name"
)

print(compound)

# Return results for selected compound.
instance(compound, "aspirin")
instance(compound, "rstudio")
# instance(compound, "unknown"). # returns error.

# Extract compound properties for the compound "aspirin".
# Use the 'retrieve()' function to extract specific slots from the compound list.
retrieve(instance(compound, "aspirin"), "props")

Retrieve Compound Properties from PubChem

Description

This function sends a request to PubChem to retrieve compound properties based on the specified parameters.

Usage

get_properties(
  properties = NULL,
  identifier,
  namespace = "cid",
  searchtype = NULL,
  options = NULL,
  propertyMatch = list(.ignore.case = FALSE, type = "contain")
)

property_map(
  x,
  type = c("match", "contain", "start", "end", "all"),
  .ignore.case = TRUE,
  ...
)

Arguments

Details

For more detailed information, please refer to the PubChem PUG REST API documentation.

Value

An object of class "PubChemInstanceList" containing all the properties of the requested compounds.

Note

Property Map:

property_map() is not used to request properties directly from the PubChem database. This function is intended to list the available compound properties that can be requested from PubChem. It has flexible options to search properties from the available property list of the PubChem database. The output of property_map is used as the property input in the get_properties function. This function may be practically used to request specific properties across a range of compounds. See examples for usage.

Examples

# Isomeric SMILES of the compounds
props <- get_properties(
  properties = c("MolecularWeight", "MolecularFormula", "InChI"),
  identifier = c("aspirin", "ibuprofen", "caffeine"),
  namespace = "name"
)

# Properties for a selected compound
instance(props, "aspirin")
retrieve(props, .which = "aspirin", .slot = NULL)
retrieve(instance(props, "aspirin"), .slot = NULL)

# Combine properties of all compounds into a single data frame (or list)
retrieve(props, .combine.all = TRUE)

# Return selected properties
retrieve(props, .combine.all = TRUE,
  .slot = c("MolecularWeight", "MolecularFormula"))

# Return properties for the compounds in a range of CIDs
props <- get_properties(
  properties = c("mass", "molecular"),
  identifier = 2244:2255,
  namespace = "cid",
  propertyMatch = list(
    type = "contain"
  )
)

retrieve(props, .combine.all = TRUE, .to.data.frame = TRUE)

# Return all available properties of the requested compounds
props <- get_properties(
  properties = NULL,
  identifier = 2244:2245,
  namespace = "cid",
  propertyMatch = list(
    type = "all"
  )
)

retrieve(props, .combine.all = TRUE)




#### EXAMPLES FOR property_map() ####
# List all available properties:
property_map(type = "all")

# Exact match:
property_map("InChI", type = "match")
property_map("InChi", type = "match",
  .ignore.case = TRUE) # Returns no match. Ignores '.ignore.case'

# Match at the start/end:
property_map("molecular", type = "start", .ignore.case = TRUE)
property_map("mass", type = "end", .ignore.case = TRUE)

# Partial match with multiple search patterns:
property_map(c("molecular", "mass", "inchi"),
  type = "contain", .ignore.case = TRUE)

Retrieve Data from PubChem PUG REST API

Description

This function sends a request to the PubChem PUG REST API to retrieve various types of data for a given identifier. It supports fetching data in different formats and allows saving the output.

Usage

get_pug_rest(
  identifier = NULL,
  namespace = "cid",
  domain = "compound",
  operation = NULL,
  output = "JSON",
  searchtype = NULL,
  property = NULL,
  options = NULL,
  save = FALSE,
  dpi = 300,
  path = NULL,
  file_name = NULL,
  ...
)

Arguments

Details

For more information on the possible values for parameters such as namespace, domain, operation, output, searchtype, and property, please refer to the PUG REST API documentation.

Value

An object of class ''PugRestInstance'' containing:

'success'

Logical value indicating if the request was successful.

'error'

If 'success' is 'FALSE', a list containing error messages.

'result'

The content retrieved from the API; format depends on 'output'.

'request_args'

A list of the arguments used in the request.

'fileDetails'

If 'save' is 'TRUE', details about the saved file.

Examples

  result <- get_pug_rest(identifier = "2244",
                         namespace = "cid",
                         domain = "compound",
                         output = "JSON"
                        )
  pubChemData(result)

Retrieve PUG View Data from PubChem

Description

This function sends a request to the PubChem PUG View API to retrieve various types of data for a given identifier. It supports fetching annotations, QR codes, and more, with options for different output formats including JSON and SVG.

Usage

get_pug_view(
  annotation = "data",
  identifier = NULL,
  domain = "compound",
  output = "JSON",
  heading = NULL,
  headingType = NULL,
  page = NULL,
  qrSize = "short",
  save = FALSE
)

Arguments

Details

The PubChem PUG View API allows users to retrieve detailed information about compounds, substances, and assays. This function constructs the appropriate API call based on the provided parameters. For more detailed information, please refer to the PubChem PUG View API documentation.

Value

Depending on the output format, this function returns different types of content: JSON or JSONP format returns parsed JSON content. SVG format returns an image object. For QR codes, it returns an image object or saves a PNG file.

Examples

result <- get_pug_view(identifier = "2244", annotation = "linkout", domain = "compound")
retrieve(result, .slot = "ObjUrl", .to.data.frame = FALSE)

Retrieve/Save SDF Data from PubChem

Description

This function sends a request to PubChem to retrieve data in SDF format based on the specified parameters. It then saves the retrieved data as an SDF file in the current working directory (or into the system-specific temporary folder).

Usage

get_sdf(
  identifier,
  namespace = "cid",
  domain = "compound",
  operation = NULL,
  searchtype = NULL,
  path = NULL,
  file_name = NULL,
  options = NULL
)

Arguments

Details

The PubChem PUG REST API allows users to retrieve compound data in various formats, including SDF. This function constructs the appropriate API call and saves the SDF data to a file. For more detailed information, please refer to the PubChem PUG REST API documentation.

Value

The function saves the retrieved data as an SDF file in the current working directory and prints a message indicating the file's location.

Examples

get_sdf(
  identifier = "aspirin",
  namespace = "name",
  path = NULL
)

Retrieve Substance IDs (SIDs) from PubChem

Description

This function sends a request to PubChem to retrieve Substance IDs (SIDs) for a given identifier.

Usage

get_sids(
  identifier,
  namespace = "cid",
  domain = "compound",
  searchtype = NULL,
  options = NULL
)

Arguments

Details

#' For more detailed information, please refer to the PubChem PUG REST API documentation.

Value

An object of class 'PubChemInstance_SIDs', which is a list containing information retrieved from the PubChem database. Substance IDs can be extracted from the returned object using the SIDs function.

Examples

result <- get_sids(
  identifier = c("aspirin", "ibuprofen"),
  namespace = "name"
)

# Extract substance IDs of all compounds
SIDs(result)

Retrieve Substances from PubChem

Description

This function sends a request to PubChem to retrieve substance data based on the specified parameters.

Usage

get_substances(identifier, namespace = "sid", operation = NULL, options = NULL)

Arguments

Details

For more detailed information, please refer to the PubChem PUG REST API documentation.

Value

An object of class 'PubChemInstanceList' containing all the substance information of requested compounds.

Examples

subs <- get_substances(
  identifier = c("aspirin", "ibuprofen"),
  namespace = "name"
)

instance(subs, "aspirin")
retrieve(instance(subs, "aspirin"), "source")

Retrieve Synonyms from PubChem

Description

This function sends a request to PubChem to retrieve synonyms for a given identifier. It returns a list of synonyms corresponding to the provided identifier.

Usage

get_synonyms(
  identifier,
  namespace = "cid",
  domain = "compound",
  searchtype = NULL,
  options = NULL
)

Arguments

Details

The PubChem PUG REST API allows for retrieving synonyms related to various domains. The table below summarizes valid combinations for retrieving synonyms: For more detailed information, please refer to the PubChem PUG REST API documentation.

Value

An object of class 'PubChemInstance_Synonyms', which is a list containing information retrieved from the PubChem database. Synonyms data can be extracted from the returned object using the synonyms function.

Examples

syns <- get_synonyms(
  identifier = "aspirin",
  namespace = "name"
)

syns

synonyms(syns)

Check Whether Queries Returned Hits

Description

Returns a named logical vector indicating whether each requested identifier produced hits. This is useful for guarding downstream formatting (for example, 'sprintf') when some identifiers return no results.

Usage

has_hits(object, .which = NULL, ...)

Arguments

Value

A named logical vector. Names correspond to requested identifiers.

Examples

req <- get_cids(c("aspirin", "definitely_not_real"), namespace = "name")
flags <- has_hits(req)
if (any(flags)) {
  CIDs(req)
}

Retrieve Information for Requested Instances

Description

This function extracts the results of a PubChem instance from an object. It is designed to retrieve information about a compound from a comprehensive list where multiple elements (such as assay, compound, etc.) are requested.

Usage

instance(object, ...)

## S3 method for class 'PubChemInstanceList'
instance(object, .which = NULL, ...)

Arguments

Details

'instance()' is a lightweight accessor that selects one requested identifier result from a multi-request container.

Value

A single instance object extracted from object, typically of class PubChemInstance.

Examples

compounds <- get_compounds(
  identifier = c("aspirin", "ibuprofen"),
  namespace = "name"
)

instance(compounds)  # Returns the results for "aspirin"
instance(compounds, "ibuprofen")

Build an Assay Activity Matrix

Description

Converts long-form assay activity data into dense or sparse matrix-ready representations indexed by compound and assay identifiers.

Usage

pc_activity_matrix(
  x,
  cid_col = "CID",
  aid_col = "AID",
  outcome_col = "ActivityOutcome",
  value_map = c(Active = 1, Inactive = 0, Inconclusive = NA_real_),
  strict_outcome = FALSE,
  unknown_outcome = NA_real_,
  fill = NA_real_,
  prefix = "AID_",
  aggregate = c("max", "mean", "first"),
  output = c("tibble", "sparse")
)

Arguments

Details

Character outcomes are normalized through 'pc_activity_outcome_map()'. For repeated CID/AID pairs, values are aggregated using the selected strategy.

Value

A wide tibble ('output = "tibble"') or a sparse matrix wrapper object of class 'PubChemSparseActivityMatrix' ('output = "sparse"').

Examples

long_tbl <- tibble::tibble(
  CID = c("1", "1", "2"),
  AID = c("10", "11", "10"),
  ActivityOutcome = c("Active", "Inactive", "Active")
)
pc_activity_matrix(long_tbl)

Harmonize Activity Outcome Labels

Description

Converts textual activity outcomes (for example, 'Active'/'Inactive') into numeric values for matrix and modeling workflows.

Maps textual activity outcomes (for example, 'Active'/'Inactive') to numeric values for modeling workflows.

Usage

pc_activity_outcome_map(values, map = NULL, strict = FALSE, unknown = NA_real_)

Arguments

Details

Matching is case-insensitive after trimming whitespace. Custom maps augment the built-in defaults unless names overlap.

Value

Numeric vector aligned with 'values'.

Examples

pc_activity_outcome_map(c("Active", "Inactive", "Unknown"))

Query Assay Records via the Next-Generation API

Description

Convenience wrapper around 'pc_request()' for assay retrieval workflows.

Usage

pc_assay(
  identifier,
  namespace = "aid",
  operation = "description",
  output = "JSON",
  options = NULL,
  ...
)

Arguments

Details

Defaults are tuned for assay description retrieval while preserving all transport controls via '...'.

Value

A typed 'PubChemRecord' object.

Examples

assay_rec <- pc_assay(367, offline = TRUE)
inherits(assay_rec, "PubChemRecord")

## Not run: 
pc_assay(367)

## End(Not run)

Convert PubChem Assay Summary to Long Activity Table

Description

Builds a normalized long-form table from the PubChem 'compound/*/assaysummary/JSON' payload, suitable for 'pc_activity_matrix()'.

Usage

pc_assay_activity_long(
  identifier = NULL,
  namespace = "cid",
  x = NULL,
  chunk_size = NULL,
  unique_rows = TRUE,
  add_outcome_value = TRUE,
  outcome_map = NULL,
  strict_outcome = FALSE,
  unknown_outcome = NA_real_,
  error_mode = c("stop", "result"),
  ...
)

Arguments

Details

Input can be fetched directly from PubChem or provided as an already parsed payload. Column names are normalized to stable identifiers and optional numeric activity outcomes can be added for modeling workflows.

Value

A tibble with normalized fields including 'CID', 'AID', and 'ActivityOutcome' when available.

Examples

payload <- list(
  Table = list(
    Columns = list(Column = c("CID", "AID", "Activity Outcome")),
    Row = list(
      list(Cell = c("2244", "367", "Active")),
      list(Cell = c("2244", "368", "Inactive"))
    )
  )
)
pc_assay_activity_long(x = payload)

Batch-Orchestrate PubChem Workflows

Description

Splits identifier vectors into chunks, applies a worker function per chunk, and records per-chunk success and error metadata.

Usage

pc_batch(
  ids,
  fn,
  chunk_size = 100,
  parallel = FALSE,
  workers = NULL,
  checkpoint_dir = NULL,
  checkpoint_id = NULL,
  resume = FALSE,
  rerun_failed = TRUE,
  ...
)

Arguments

Details

Checkpoint files can be written to disk and resumed later. Parallel execution is available on supported platforms when checkpointing is disabled.

Value

A typed 'PubChemBatchResult' object.

Examples

batch <- pc_batch(
  ids = 1:6,
  fn = function(chunk_ids, ...) sum(chunk_ids),
  chunk_size = 2
)
length(batch$results)

Benchmark Chunked PubChem Workflows

Description

Evaluates 'pc_batch()' execution under multiple chunk-size and parallel settings and returns runtime and failure metrics.

Usage

pc_benchmark(
  ids,
  fn,
  chunk_sizes = c(25, 50, 100),
  parallel_options = c(FALSE),
  workers = NULL,
  ...
)

Arguments

Details

This benchmark is intended for tuning operational parameters before running large production queries.

Value

A tibble with runtime and success metrics for each benchmark scenario.

Examples

bm <- pc_benchmark(
  ids = 1:20,
  fn = function(chunk_ids, ...) sum(chunk_ids),
  chunk_sizes = c(5, 10),
  parallel_options = FALSE
)
nrow(bm)

Benchmark Harness for Scale Scenarios

Description

Executes benchmark scenarios (defaults: 10, 1000, 100000 identifiers), evaluates threshold gates, and optionally writes a report artifact.

Usage

pc_benchmark_harness(
  fn,
  ids = NULL,
  scenario_sizes = c(10L, 1000L, 100000L),
  id_generator = NULL,
  chunk_sizes = c(25L, 100L, 1000L),
  parallel_options = c(FALSE),
  workers = NULL,
  thresholds = pc_default_benchmark_thresholds(),
  report_path = NULL,
  report_format = c("markdown", "csv", "rds"),
  ...
)

Arguments

Details

Scenario-level summaries include elapsed-time and failed-chunk-ratio gates, making this helper useful for CI performance regression checks.

Value

An object of class 'PubChemBenchmarkReport' containing 'details' and 'summary' tibbles.

Examples

report <- pc_benchmark_harness(
  fn = function(chunk_ids, ...) sum(chunk_ids),
  ids = 1:50,
  scenario_sizes = c(10L, 20L),
  chunk_sizes = c(5L),
  parallel_options = FALSE
)
class(report)

Clear PubChemR Request Cache

Description

Clears request cache entries stored in memory and/or on disk.

Usage

pc_cache_clear(cache_dir = NULL, memory = TRUE, disk = TRUE)

Arguments

Details

Use this helper before reproducible reruns or after changing transport settings when you want to avoid stale cached responses.

Value

Invisibly returns 'TRUE'.

Examples

tmp_dir <- tempdir()
pc_cache_info(cache_dir = tmp_dir)
pc_cache_clear(cache_dir = tmp_dir, memory = TRUE, disk = FALSE)
pc_cache_info(cache_dir = tmp_dir)

Cache Diagnostics for PubChemR

Description

Reports the current number and size of cached items in memory and on disk.

Usage

pc_cache_info(cache_dir = NULL)

Arguments

Details

This is a lightweight diagnostic utility for validating cache behavior in long-running workflows and CI jobs.

Value

A one-row tibble with memory and disk cache diagnostics.

Examples

pc_cache_info(cache_dir = tempdir())

Inspect Next-Generation Workflow Capabilities

Description

Reports runtime capabilities relevant to next-generation workflows, including offline policy, cache readiness, and optional dependency availability.

Usage

pc_capabilities(cache_dir = NULL, check_network = FALSE, network_timeout = 2)

Arguments

Details

Network checks are disabled by default to keep behavior deterministic and CRAN-friendly. Use 'check_network = TRUE' only in interactive contexts.

Value

A one-row tibble with capability flags and runtime settings.

Examples

pc_capabilities()

Collect Results From an Async PubChem Query

Description

Resolves a 'PubChemAsyncQuery' object to a final 'PubChemResult' by polling when a listkey is present, or returning the initial response otherwise.

Usage

pc_collect(x, ...)

Arguments

Details

This helper simplifies asynchronous flow control by encapsulating the listkey/no-listkey branching logic in one call.

Value

A 'PubChemResult' object.

Examples

q <- structure(
  list(
    initial = pc_request(identifier = 2244, offline = TRUE),
    listkey = NULL,
    domain = "compound",
    operation = NULL,
    output = "JSON",
    options = NULL
  ),
  class = "PubChemAsyncQuery"
)
out <- pc_collect(q)
inherits(out, "PubChemResult")

Query Compound Records via the Next-Generation API

Description

Convenience wrapper around 'pc_request()' for 'compound' domain record retrieval.

Usage

pc_compound(
  identifier,
  namespace = "cid",
  operation = NULL,
  searchtype = NULL,
  output = "JSON",
  options = NULL,
  ...
)

Arguments

Details

Returns a typed 'PubChemRecord' object and preserves transport metadata such as 'success', 'status', and cache flags.

Value

A typed 'PubChemRecord' object.

Examples

cmp <- pc_compound(2244, offline = TRUE)
inherits(cmp, "PubChemRecord")

## Not run: 
pc_compound(2244)

## End(Not run)

Configure PubChemR Next-Gen API Defaults

Description

Reads or updates global defaults used by the next-generation PubChemR transport helpers (timeouts, retries, cache settings, and rate limits).

Usage

pc_config(...)

Arguments

Details

Call with no arguments to inspect the active configuration. Named arguments update only the provided keys and keep all other values unchanged.

Value

A named list of active configuration values.

Examples

cfg <- pc_config()
names(cfg)
pc_config(rate_limit = cfg$rate_limit)$rate_limit

Join Compound, Substance, Assay, and Target Tables

Description

Joins cross-domain PubChem tables into a single analysis-ready tibble using configurable key mappings and join type.

Usage

pc_cross_domain_join(
  compounds,
  substances = NULL,
  assays = NULL,
  targets = NULL,
  by = list(compound_substance = "CID", compound_assay = "CID", assay_target = "AID"),
  join = c("left", "inner", "full")
)

Arguments

Details

Join steps are applied in order: compounds-substances, compounds-assays, then assays-targets when corresponding tables are supplied.

Value

A joined tibble suitable for downstream analysis workflows.

Examples

compounds <- tibble::tibble(CID = c("1", "2"), MW = c(100, 200))
assays <- tibble::tibble(CID = c("1", "2"), AID = c("10", "11"))
pc_cross_domain_join(compounds, assays = assays)

Example Assay Summary Payload for Next-Generation Workflows

Description

Returns a small deterministic payload shaped like 'compound/*/assaysummary/JSON', suitable for local examples and tests.

Usage

pc_example_assaysummary_payload()

Value

A named list containing 'Table/Columns/Row' assay summary data.

Examples

payload <- pc_example_assaysummary_payload()
tbl <- pc_assay_activity_long(x = payload)
nrow(tbl)

Example Feature Table for Next-Generation Modeling Workflows

Description

Returns a compact feature table with common compound descriptors for deterministic, offline-friendly workflow examples.

Usage

pc_example_feature_table()

Value

A tibble containing CID-level descriptor columns.

Examples

pc_example_feature_table()

Export Model-Ready Data

Description

Writes model-ready data to disk from either a 'PubChemModelMatrix' object or a tabular object.

Usage

pc_export_model_data(
  x,
  path,
  format = c("csv", "rds"),
  include_ids = TRUE,
  include_outcome = TRUE
)

Arguments

Details

Output format is selected by 'format'; 'csv' is written with 'utils::write.csv()' and 'rds' with 'saveRDS()'.

Value

Invisibly returns a list with 'path', 'format', and output dimensions.

Examples

out_file <- tempfile(fileext = ".csv")
x <- tibble::tibble(CID = c("1", "2"), x1 = c(0.1, 0.2))
meta <- pc_export_model_data(x, path = out_file, format = "csv")
file.exists(meta$path)

Build a Modeling-Ready Feature Table

Description

Retrieves compound property fields and returns them in a flat table intended for feature engineering and modeling workflows.

Usage

pc_feature_table(
  identifier,
  properties = c("MolecularWeight", "XLogP", "TPSA", "HBondDonorCount",
    "HBondAcceptorCount"),
  namespace = "cid",
  numeric_only = TRUE,
  error_mode = c("stop", "result"),
  ...
)

Arguments

Details

Transport metadata columns are removed from the returned table. With 'numeric_only = TRUE', feature columns are opportunistically converted to numeric where conversion yields at least one finite value.

Value

A tibble of compound features suitable for downstream modeling workflows.

Examples

names(formals(pc_feature_table))

## Not run: 
pc_feature_table(2244, properties = c("MolecularWeight", "XLogP"))

## End(Not run)

Map Identifiers via the Next-Generation API

Description

Converts one identifier type to another ('CID', 'SID', 'AID') using PubChem identifier mapping endpoints.

Usage

pc_identifier_map(
  identifier,
  namespace = "name",
  to = c("cids", "sids", "aids"),
  domain = "compound",
  searchtype = NULL,
  options = NULL,
  ...
)

Arguments

Details

This is commonly used to bridge domains, for example mapping names to CIDs before downstream property or assay workflows.

Value

A typed 'PubChemIdMap' object.

Examples

id_map <- pc_identifier_map("aspirin", namespace = "name", to = "cids", offline = TRUE)
inherits(id_map, "PubChemIdMap")

## Not run: 
pc_identifier_map("aspirin", namespace = "name", to = "cids")

## End(Not run)

Versioning and Deprecation Policy

Description

Returns the compatibility policy table used for PubChemR legacy and next-generation APIs.

Usage

pc_lifecycle_policy()

Details

The table summarizes expected support windows and deprecation notice guarantees by API stream.

Value

A tibble describing PubChemR compatibility and deprecation guarantees.

Examples

pc_lifecycle_policy()

Convert Feature Tables to Model Matrix Form

Description

Converts tabular PubChem features into a numeric model-matrix bundle with optional outcome and identifier metadata.

Usage

pc_model_matrix(
  x,
  outcome = NULL,
  id_cols = c("CID", "SID", "AID", "Identifier"),
  na_fill = NULL,
  scale = FALSE
)

Arguments

Details

Non-numeric predictors are coerced when feasible, then filtered to numeric columns only. The returned object stores predictors, optional response, and identifier columns.

Value

An object of class 'PubChemModelMatrix' with 'x', 'y', and metadata fields.

Examples

tbl <- tibble::tibble(CID = c("1", "2"), x1 = c("1.0", "2.0"), y = c(0, 1))
mm <- pc_model_matrix(tbl, outcome = "y")
class(mm)

Poll an Asynchronous PubChem ListKey

Description

Polls PubChem listkey endpoints until results are ready or the attempt limit is reached.

Usage

pc_poll(
  x,
  domain = "compound",
  operation = NULL,
  output = "JSON",
  options = NULL,
  interval = 1.5,
  max_attempts = 20,
  ...
)

Arguments

Details

Polling stops early once 'pending = FALSE'. On timeout, a structured 'PubChemResult' failure with code 'PollingTimeout' is returned.

Value

A 'PubChemResult' object.

Examples

polled <- pc_poll("example-listkey", max_attempts = 1, offline = TRUE)
polled$success

Apply a Predefined Execution Profile

Description

Applies a named transport profile and optional overrides to 'pc_config()'.

Usage

pc_profile(profile = c("default", "cloud", "high_throughput"), ...)

Arguments

Details

Profiles provide baseline settings for rate limits, retries, and cache TTL. Any named overrides supplied in '...' replace the selected profile values.

Value

A named list with active transport configuration.

Examples

cfg <- pc_profile("default")
cfg$rate_limit

Query Compound Properties via the Next-Generation API

Description

Retrieves selected PubChem compound properties for one or more identifiers.

Usage

pc_property(
  identifier,
  properties,
  namespace = "cid",
  searchtype = NULL,
  options = NULL,
  ...
)

Arguments

Details

'properties' is encoded into the PUG REST operation path. At least one property name is required.

Value

A typed 'PubChemRecord' object.

Examples

prop_rec <- pc_property(2244, properties = c("MolecularWeight"), offline = TRUE)
inherits(prop_rec, "PubChemRecord")

## Not run: 
pc_property(2244, properties = c("MolecularWeight", "XLogP"))

## End(Not run)

Unified Transport Layer for PubChem Requests

Description

Executes PubChem API calls with unified handling for URL construction, retries, throttling, and optional cache replay.

Usage

pc_request(
  domain = "compound",
  namespace = "cid",
  identifier = NULL,
  operation = NULL,
  searchtype = NULL,
  output = "JSON",
  options = NULL,
  method = c("GET", "POST"),
  body = NULL,
  rate_limit = TRUE,
  timeout = NULL,
  retries = NULL,
  pause_base = NULL,
  pause_cap = NULL,
  user_agent = NULL,
  cache = FALSE,
  cache_dir = NULL,
  cache_ttl = NULL,
  force_refresh = FALSE,
  offline = NULL,
  ...
)

Arguments

Details

'pc_request()' is the low-level engine behind higher-level 'pc_*' helpers. When 'offline = TRUE', requests are served from cache only and return a structured failure object on cache misses.

Value

An object of class 'PubChemResult'.

Examples

# Fast, network-free call: returns cache hit or structured cache-miss result.
res <- pc_request(identifier = 2244, offline = TRUE)
res$success

## Not run: 
pc_request(identifier = 2244)

## End(Not run)

Normalize an HTTP Response Into a Typed PubChem Result

Description

Parses PubChem response payloads and standardizes them into a typed 'PubChemResult' object with success, error, and metadata fields.

Usage

pc_response(response, request = list())

Arguments

Details

JSON and plain-text payloads are supported. Fault payloads and non-2xx HTTP statuses are normalized into structured error entries rather than raising immediate transport exceptions.

Value

An object of class 'PubChemResult'.

Examples

ok <- pc_response('{"IdentifierList":{"CID":[2244]}}', request = list(domain = "compound"))
ok$success

fail <- pc_response('{"Fault":{"Code":"PUGREST.NotFound","Message":"Not found"}}')
fail$success

Resume a Checkpointed Batch Workflow

Description

Reloads a previously checkpointed 'pc_batch()' run and executes pending or failed chunks.

Usage

pc_resume_batch(
  fn,
  checkpoint_dir,
  checkpoint_id,
  parallel = FALSE,
  workers = NULL,
  rerun_failed = TRUE,
  ...
)

Arguments

Details

This helper reads the batch manifest created by 'pc_batch()' and preserves the original chunking strategy.

Value

A typed 'PubChemBatchResult' object.

Examples

cp_dir <- tempdir()
cp_id <- "pc-doc-example"

pc_batch(
  ids = 1:4,
  fn = function(chunk_ids, ...) sum(chunk_ids),
  chunk_size = 2,
  checkpoint_dir = cp_dir,
  checkpoint_id = cp_id
)

resumed <- pc_resume_batch(
  fn = function(chunk_ids, ...) sum(chunk_ids),
  checkpoint_dir = cp_dir,
  checkpoint_id = cp_id
)
resumed$checkpoint$resumed

Retrieve Full Biological Test Results from PubChem SDQ

Description

Queries the PubChem SDQ (Structured Data Query) agent to retrieve the full biological test results table for a compound. Uses the download query mode to return all available columns for each record. The number and names of columns vary by compound depending on available data (e.g. baid, aid, sid, cid, activityid, aidtypeid, aidname, targetname, cmpdname, acvalue, geneid, etc.).

Usage

pc_sdq_bioactivity(
  identifier = NULL,
  namespace = "cid",
  collection = "bioactivity",
  limit = 10000000L,
  order = "activity,asc",
  rate_limit = TRUE,
  cache = FALSE,
  cache_dir = NULL,
  cache_ttl = NULL,
  force_refresh = FALSE,
  timeout = NULL,
  retries = NULL,
  pause_base = NULL,
  pause_cap = NULL,
  user_agent = NULL,
  offline = NULL,
  error_mode = c("stop", "result")
)

Arguments

Details

When namespace != "cid", the identifier is first resolved to CID via pc_request before querying SDQ. Returned columns depend on source availability for the requested compound.

Value

A tibble of class PubChemTable containing the full bioactivity results.

Examples

names(formals(pc_sdq_bioactivity))

## Not run: 
  # Retrieve bioactivity data for aspirin (CID 2244)
  bio <- pc_sdq_bioactivity(2244)
  head(bio)

## End(Not run)

Similarity-Driven Identifier Search

Description

Performs similarity search requests and returns mapped identifiers in a typed result object.

Usage

pc_similarity_search(
  identifier,
  namespace = c("smiles", "cid", "inchi", "sdf"),
  domain = "compound",
  to = c("cids", "sids", "aids"),
  searchtype = c("similarity", "fastsimilarity_2d", "fastsimilarity_3d"),
  threshold = 95,
  max_records = NULL,
  options = NULL,
  ...
)

Arguments

Details

Similarity mode is controlled by 'searchtype' and 'threshold'. Optional 'max_records' is translated to 'list_return' and appended to query options.

Value

A typed object inheriting from 'PubChemIdMap'.

Examples

sim <- pc_similarity_search("CC(=O)OC1=CC=CC=C1C(=O)O", namespace = "smiles", offline = TRUE)
inherits(sim, "PubChemIdMap")

## Not run: 
pc_similarity_search("CC(=O)OC1=CC=CC=C1C(=O)O", namespace = "smiles")

## End(Not run)

Submit an Asynchronous PubChem Query

Description

Submits a potentially asynchronous PubChem request and returns a query object containing the initial response and listkey metadata.

Usage

pc_submit(
  domain = "compound",
  namespace = "cid",
  identifier = NULL,
  operation = NULL,
  searchtype = NULL,
  output = "JSON",
  options = NULL,
  ...
)

Arguments

Details

If PubChem responds with a waiting payload, 'listkey' is captured and can be polled later using 'pc_poll()' or 'pc_collect()'.

Value

An object of class 'PubChemAsyncQuery'.

Examples

q <- pc_submit(identifier = 2244, offline = TRUE)
inherits(q, "PubChemAsyncQuery")

## Not run: 
pc_submit(identifier = 2244)

## End(Not run)

Query Substance Records via the Next-Generation API

Description

Convenience wrapper around 'pc_request()' for 'substance' domain retrieval.

Usage

pc_substance(
  identifier,
  namespace = "sid",
  operation = "record",
  output = "JSON",
  options = NULL,
  ...
)

Arguments

Details

The function returns a typed record object without altering payload shape, making it suitable for downstream custom parsers.

Value

A typed 'PubChemRecord' object.

Examples

sub_rec <- pc_substance(5360534, offline = TRUE)
inherits(sub_rec, "PubChemRecord")

## Not run: 
pc_substance(5360534)

## End(Not run)

Convert PubChem Tables to ChemmineR SDF Objects

Description

Converts SMILES strings from a PubChem table to a 'ChemmineR' SDF object.

Usage

pc_to_chemminer(x, smiles_col = "CanonicalSMILES")

Arguments

Details

Requires the optional 'ChemmineR' package with an available 'smiles2sdf()' function.

Value

A 'ChemmineR' SDF object.

Examples

names(formals(pc_to_chemminer))

## Not run: 
ex_tbl <- tibble::tibble(CanonicalSMILES = "CCO")
sdf <- pc_to_chemminer(ex_tbl)
class(sdf)

## End(Not run)

Convert PubChem Tables to rcdk Molecules

Description

Converts SMILES strings from a PubChem table into 'rcdk' molecule objects.

Usage

pc_to_rcdk(x, smiles_col = "CanonicalSMILES", id_col = "CID")

Arguments

Details

Requires the optional 'rcdk' package. Empty or missing SMILES values are dropped before conversion.

Value

A list of 'rcdk' molecule objects.

Examples

names(formals(pc_to_rcdk))

## Not run: 
ex_tbl <- tibble::tibble(CID = "1", CanonicalSMILES = "CCO")
mols <- pc_to_rcdk(ex_tbl)
length(mols)

## End(Not run)

Retrieve Raw Data from PUG REST Object

Description

Generic accessor returning raw payload data from a PugRestInstance.

Usage

pubChemData(object, ...)

## S3 method for class 'PugRestInstance'
pubChemData(object, ...)

Arguments

Details

This helper bypasses higher-level format-specific extractors and returns the underlying parsed result object as stored on the request instance.

Value

a vector, list, or data.frame containing the raw data retrieved from Pub Chem database through PUG REST API.

See Also

get_pug_rest

Examples

result <- get_pug_rest(identifier = "2244", namespace = "cid", domain = "compound", output = "JSON")
pubChemData(result)

Retrieve Function Inputs

Description

This function retrieves the input arguments from a specified PubChem database request object.

Usage

request_args(object, .which = NULL, ...)

Arguments

Details

This accessor is useful for auditing request provenance when downstream objects are passed through multiple transformation steps.

Value

A list or string vector containing the options used in the function call.

Examples

request <- get_cids("aspirin", namespace = "name")

request_args(request, "identifier")
request_args(request)

Retrieve Information from PubChem Instances

Description

This generic function extracts a specific slot from a PubChem instance.

Usage

retrieve(object, ...)

## S3 method for class 'PubChemResult'
retrieve(object, .slot = "data", .to.data.frame = TRUE, .verbose = FALSE, ...)

## S3 method for class 'PubChemInstance'
retrieve(object, .slot = NULL, .to.data.frame = TRUE, .verbose = FALSE, ...)

## S3 method for class 'PubChemInstanceList'
retrieve(
  object,
  .which = NULL,
  .slot = NULL,
  .to.data.frame = TRUE,
  .combine.all = FALSE,
  ...
)

## S3 method for class 'PC_Substance'
retrieve(
  object,
  .slot = NULL,
  .idx = 1,
  .to.data.frame = TRUE,
  .verbose = FALSE,
  ...
)

## S3 method for class 'PugViewInstance'
retrieve(object, .slot = NULL, .to.data.frame = TRUE, ...)

## S3 method for class 'PugViewSection'
retrieve(object, .slot = NULL, .to.data.frame = FALSE, ...)

Arguments

Details

'retrieve()' is a generic extractor that targets result slots across several PubChemR object classes and can optionally coerce outputs to tabular form.

Value

Retrieved slot contents as a vector, list, or tabular object, depending on method and arguments.

Details on 'PugViewInstance' and 'PugViewSection'

The PugView API returns a detailed list related to PubChem requests. The 'Section' slot in this list is structured into a sub-class called 'PugViewSection'. This object contains information organized through several sections (or sub-sections), which can be retrieved using section-specific functions such as section and sectionList.

The function argument .to.data.frame is ignored if the "Section" slot is being extracted from the complete list. For other slots, .to.data.frame is considered as usual. See examples for usage.

Note

If the object is from the 'PC_Properties' class, the .slot can be defined as NULL. If .slot = NULL, retrieve() will return all available properties. If 'object' is of class other than 'PC_Properties', .slot should be length of 1.

Extracting multiple slots.

In some cases, it may be practical to extract multiple slots from 'object'. For example, one may wish to extract properties from the output of get_properties by running the functions in a loop. See codes below for a practical example:

  library(dplyr)

  props <- get_properties(
    properties = c("MolecularWeight", "MolecularFormula", "HBondDonorCount",
                   "HBondAcceptorCount", "InChIKey", "InChI"),
    identifier = 2244,
    namespace = "cid",
    propertyMatch = list(
      .ignore.case = TRUE,
      type = "contain"
    )
  )

  bind_columns <- function(x, ...){
    part1 <- x[[1]][ ,"Identifier"]
    part2 <- lapply(x, "[", 2) 
      bind_cols()

    bind_cols(part1, part2)
  }

  propsToExtract <- c("MolecularWeight", "MolecularFormula", "HBondDonorCount")
  tmp <- lapply(propsToExtract, retrieve, object = props, .which = "2244")
  bind_columns(tmp)

Use of the '.verbose' argument

retrieve returns output silently (invisibly) when .verbose = TRUE. However, the function behaves differently under the following scenarios:

• .verbose is ignored if .combine.all = TRUE. The output is returned silently.

• .verbose is ignored if the requested slot is not printable to the R console because it is too complicated to print.

Examples

res <- pc_response(
  '{"IdentifierList":{"CID":[2244,3672]}}',
  request = list(domain = "compound", namespace = "name", identifier = "aspirin")
)

retrieve(res)
retrieve(res, .slot = "IdentifierList/CID", .to.data.frame = FALSE)


compounds <- get_compounds(
  identifier = c("aspirin", "ibuprofen", "rstudio"),
  namespace = "name"
 )

# Extract information for "aspirin"
aspirin <- instance(compounds, "aspirin")
# print(aspirin)

# Extract a specific slot from the "aspirin" compound.
retrieve(aspirin, "props", .to.data.frame = TRUE)


# Examples (PubChemInstanceList)
retrieve(compounds, "aspirin", "props", .to.data.frame = TRUE)

# Verbose Assay References to R Console
assays <- get_assays(identifier = c(1234, 7815), namespace = "aid")

instance(assays, "7815")
retrieve(assays, "7815", "xref", .verbose = TRUE)

# Print assay protocol to R console (if available)
# Note that it may be too long to print for some assays.
# retrieve(assays, "1234", "protocol", .verbose = TRUE)

# No protocol is available for assay "1234".
# retrieve(assays, "7815", "protocol", .verbose = TRUE)

# Ignores ".verbose" and ".which" if ".combine.all = TRUE".
retrieve(assays, .slot = "xref", .verbose = TRUE, .combine.all = TRUE)


### PUG VIEW EXAMPLES ###
pview <- get_pug_view(identifier = "2244", annotation = "data", domain = "compound")

# PugViewSectionList object.
# This object contains all the section information related to the PubChem request.
sect <- retrieve(pview, .slot = "Section")
print(sect)

retrieve(pview, .slot = "RecordType", .to.data.frame = TRUE)

Extract Sections from Pug View Request

Description

section returns section details from a Pug View request.

Usage

section(object, ...)

## S3 method for class 'PugViewInstance'
section(object, .id = "S1", .verbose = FALSE, ...)

## S3 method for class 'PugViewSectionList'
section(object, .id = "S1", .verbose = FALSE, ...)

## S3 method for class 'PugViewSection'
section(object, .id = "S1", .verbose = FALSE, ...)

Arguments

Details

'section()' traverses nested PUG View section structures and supports recursive drill-down by section IDs.

Value

A PugViewSection object for a selected section, or NULL when section content is unavailable.

Note

Sections in a Pug View Request

A Pug View Request returns a detailed list from the PubChem database. This list may include data under many nested sections, each corresponding to a different property structured within further nested sections. The complicated structure of the returned object makes it impossible to print all information to the R console at once. Therefore, it is recommended to print sections selectively. Furthermore, one may navigate through the nested sections using the section function. See Examples.

Use the sectionList function to list available sections (or subsections of a section) of a Pug View request and related section IDs.

Use of '.verbose' to Print Section Details

It is possible to print section details to the R console. If .verbose = TRUE, the resulting object is returned invisibly and a summary of section details is printed to the R console. This might be useful to navigate through nested sections and sequentially print multiple sections to the R console. For example, consider following command:

> section(section(request, "S1", .verbose = TRUE), "S3", .verbose = TRUE)

This command will print section "S1" and the subsection "S3" located under "S1" to the R console. One may navigate through sections under other sections, similar to exploring dreams within dreams as depicted in the exceptional movie Inception. (SPOILER WARNING!!) However, be careful not to get lost or stuck in the dreams!! Also, note that this strategy works only if .verbose = TRUE for all sections and/or subsections.

See Also

sectionList

Examples

# Pug View request for the compound "aspirin (CID = 2244)".
pview <- get_pug_view(identifier = "2244", annotation = "data", domain = "compound")

section(pview, "S1")
section(pview, "S1", .verbose = TRUE)

# List all available sections
sectionList(pview)

# Subsections under the section "S1"
sectionList(section(pview, "S1"))

# Print multiple sections
# section(section(pview, "S1", .verbose = TRUE), "S3", .verbose = TRUE)

List Available Section/Subsections

Description

This function may be used to list available sections (or subsections) of a PubChem request returned from get_pug_view. It is useful when one wants to extract a specific section (or subsection) from PubChem request. It supports patteern-specific searches within sections. See Detail/Note below for more information.

Usage

sectionList(object, ...)

## S3 method for class 'PugViewInstance'
sectionList(object, ...)

## S3 method for class 'PugViewSectionList'
sectionList(
  object,
  .pattern = NULL,
  .match_type = c("contain", "match", "start", "end"),
  ...
)

## S3 method for class 'PugViewSection'
sectionList(
  object,
  .pattern = NULL,
  .match_type = c("contain", "match", "start", "end"),
  ...
)

Arguments

Details

Pattern matching is used to filter sections that match user-defined patterns. It is useful when there are more sections than allowed to print R console. In such situations, it may be reasonable to print a subset of all section list to R console that meets search criteria. There are several pattern matching methods as described below

• Partial Matching ("contain", "start", "end"): Returns the section names that contains or starts/ends by given text patterns.

• Exact Matching ("match"): Returns the section names that exactly matches given text patterns.

Value

A tibble with section IDs/headings, or NULL when no section data are available.

See Also

section

Examples

pview <- get_pug_view(identifier = "2244", annotation = "data", domain = "compound")

# List all section names
sectionList(pview)

# Pattern-matched section names
sectionList(pview, .pattern = c("safety", "chemical"), .match_type = "contain")
sectionList(pview, .pattern = "safety", .match_type = "match")
sectionList(pview, .pattern = "properties", .match_type = "end")

# Use section IDs to extract section data from Pug View request
section(pview, "S12") # Safety and Hazards

Getter function for 'Synonyms'

Description

Extracts synonym data from a PubChem request using the function get_synonyms.

Usage

synonyms(object, ...)

## S3 method for class 'PubChemInstance_Synonyms'
synonyms(object, .to.data.frame = TRUE, ...)

Arguments

Details

The method can return either a combined tibble or raw synonym payloads, depending on .to.data.frame.

Value

A data.frame (or list) object containing the synonym data.

Examples

syns <- get_synonyms(identifier = c("aspirin", "caffeine"), namespace = "name")
synonyms(syns)