Class: Rust::CSV

Inherits:
Object show all
Defined in:
lib/rust-csv.rb

Class Method Summary collapse

Class Method Details

.read(filename, **options) ⇒ Object 



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# File 'lib/rust-csv.rb', line 13

def self.read(filename, **options)
    hash = {}
    labels = nil
    
    infer_numbers       = options.has_key?(:infer_numbers) ? options.delete(:infer_numbers) : true
    infer_integers      = options.delete(:infer_integers)
    
    ::CSV.foreach(filename, **options) do |row|
        # TODO fix this ugly patch
        unless options[:headers]
            options[:headers] = (1..row.size).to_a.map { |e| "X#{e}" }
            
            return CSV.read(filename, **options)
        end
        
        unless labels
            labels = row.headers
            labels.each do |label|
                hash[label] = []
            end
        end
        
        labels.each do |label|
            hash[label] << row[label]
        end
    end
    
    result = Rust::DataFrame.new(hash)
    if infer_numbers
        result = self.auto_infer_types(result, infer_integers)
    end
    
    return result
end

.read_all(pattern, **options) ⇒ Object 



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# File 'lib/rust-csv.rb', line 5

def self.read_all(pattern, **options)
    result = {}
    Dir.glob(pattern).each do |filename|
        result[filename] = CSV.read(filename, **options)
    end
    return result
end

.write(filename, dataframe, **options) ⇒ Object

Raises:

  • (TypeError) 


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# File 'lib/rust-csv.rb', line 48

def self.write(filename, dataframe, **options)
    raise TypeError, "Expected Rust::DataFrame" unless dataframe.is_a?(Rust::DataFrame)
    
    write_headers = options[:headers] != false
    options[:headers] = dataframe.column_names if options[:headers] == nil
    
    hash = {}
    labels = nil
    ::CSV.open(filename, 'w', write_headers: write_headers, **options) do |csv|
        dataframe.each do |row|
            csv << row
        end
    end
    
    return true
end