quanteda (version 4.0.1)

search_glob: 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
)

Value

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

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.

Examples

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