search_glob: Select types without performing slow regex search

In quanteda: Quantitative Analysis of Textual Data

Select types without performing slow regex search

Description

This is an internal function for pattern2id that select types using keys in index when available.

index_types is an internal function for pattern2id that constructs an index of "glob" or "fixed" patterns to avoid expensive sequential search.

Usage

search_glob(pattern, types_search, case_insensitive, index = NULL)

search_glob_multi(patterns, types_search, case_insensitive, index)

search_regex(pattern, types_search, case_insensitive)

search_regex_multi(patterns, types_search, case_insensitive)

search_fixed(pattern, types_search, index = NULL)

search_fixed_multi(patterns, types_search, index)

index_types(
  pattern,
  types,
  valuetype = c("glob", "fixed", "regex"),
  case_insensitive = TRUE
)

Arguments

pattern	a "glob", "fixed" or "regex" pattern
types_search	lowercased types when case_insensitive=TRUE, but not used in glob and fixed matching as types are in the index.
case_insensitive	logical; if TRUE, ignore case when matching a pattern or dictionary values
index	index object created by index_types
patterns	a list of "glob", "fixed" or "regex" patterns
valuetype	the type of pattern matching: "glob" for "glob"-style wildcard expressions; "regex" for regular expressions; or "fixed" for exact matching. See valuetype for details.

Value

index_types returns a list of integer vectors containing type IDs with index keys as an attribute

Examples

index <- quanteda:::index_types("yy*", c("xxx", "yyyy", "ZZZ"), "glob", FALSE)
quanteda:::search_glob("yy*", attr(index, "types_search"), index)

quanteda documentation built on Sept. 11, 2024, 6:08 p.m.