StructuredQueries TableColumn contains

TableColumn+contains.swift

import StructuredQueries

extension TableColumn where Value == String {
  
  public func contains(collate collation: Collation? = nil, all searchTerms: String...) -> any QueryExpression<Bool> {
    contains(collate: collation, all: searchTerms)
  }
  
  public func contains(collate collation: Collation? = nil, all searchTerms: some Collection<String>) -> any QueryExpression<Bool> {
    func makeExpression(for term: String, collation: Collation?) -> any QueryExpression<Bool> {
      collation.map { self.collate($0).contains(term) } ?? self.contains(term)
    }
    guard let firstExpression = searchTerms.first.map({ makeExpression(for: $0, collation: collation) })
    else { return SQLQueryExpression(false) }
    return searchTerms
      .dropFirst()
      .reduce(firstExpression) { expression, term in
        expression.and(makeExpression(for: term, collation: collation))
      }
  }
  
  public func contains(collate collation: Collation? = nil, any searchTerms: String...) -> any QueryExpression<Bool> {
    contains(collate: collation, any: searchTerms)
  }
  
  public func contains(collate collation: Collation? = nil, any searchTerms: some Collection<String>) -> any QueryExpression<Bool> {
    func makeExpression(for term: String, collation: Collation?) -> any QueryExpression<Bool> {
      collation.map { self.collate($0).contains(term) } ?? self.contains(term)
    }
    guard let firstExpression = searchTerms.first.map({ makeExpression(for: $0, collation: collation) })
    else { return SQLQueryExpression(false) }
    return searchTerms
      .dropFirst()
      .reduce(firstExpression) { expression, term in
        expression.or(makeExpression(for: term, collation: collation))
      }
  }
  
}