Class: CSVMapper

Inherits:
Object
  • Object
show all
Includes:
Enumerable
Defined in:
lib/csvmapper.rb,
lib/csvmapper/version.rb

Constant Summary collapse

VERSION = 
"0.0.4"
@@schema = 
[]
@@ignore_header_line = 
false
@@on_error_go_to_next_line = 
false
@@has_header = 
nil
@@delimiter = 
','
@@before_filters = 
[]

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(records = []) ⇒ CSVMapper

Returns a new instance of CSVMapper.



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# File 'lib/csvmapper.rb', line 157

def initialize(records=[])
  @records = records.map{ |hash|
    Hashie::Mash.new(hash)
  }
end

Class Method Details

.before_filter(&block) ⇒ Object 



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# File 'lib/csvmapper.rb', line 153

def self.before_filter(&block)
  @@before_filters << block
end

.column(field, *args, &block) ⇒ Object 



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# File 'lib/csvmapper.rb', line 19

def self.column(field, *args, &block)
  value = args.shift
  record = {
    field => value,
    :options => args,
    :filter => block
  }
  @@schema << record
end

.columns(*fields) ⇒ Object 



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# File 'lib/csvmapper.rb', line 29

def self.columns(*fields)
  fields.each_with_index{ |field, index|
    self.column(field, index, :string)
  }
end

.delimiter(val) ⇒ Object 



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# File 'lib/csvmapper.rb', line 149

def self.delimiter(val)
  @@delimiter = val
end

.has_header(at = 0) ⇒ Object 



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# File 'lib/csvmapper.rb', line 35

def self.has_header(at=0)
  @@has_header = at
end

.ignore_header_line(line_count = 1) ⇒ Object 



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# File 'lib/csvmapper.rb', line 140

def self.ignore_header_line(line_count=1)
  @@ignore_header_line = true
  @@ignore_header_line_count = line_count
end

.load(data) ⇒ Object 



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# File 'lib/csvmapper.rb', line 45

def self.load(data)
  buf = CSV.parse(data, :col_sep => @@delimiter)
  if @@ignore_header_line
    @@ignore_header_line_count.times{
      buf.shift()
    }
  end

  records = []
  buf.each_with_index{ |line, index|
    if line.empty?
      next
    end

    if @@has_header == index
      line.each_with_index{ |name, i|
        self.column(name.gsub(" ", "_").downcase, i, :string)
      }
      next
    end

    line = line.map{ |item|
      @@before_filters.each{ |filter|
        item = filter.call(item)
      }
      item
    }

    hash = {}
    @@schema.each{ |opt|
      key = opt.keys.first
      options = opt[:options]

      if options.empty?
        index = opt[key]
        hash[key] = line[index]
      else
        klass = options.first
        index = opt[key]

        if line[index].nil?
          hash[key] = nil
          next
        end

        begin
          case klass
          when :string
            hash[key] = line[index].to_s
          when :numeric
            hash[key] = line[index].to_i
          when :pathname
            hash[key] = Pathname.new(line[index])
          when :time
            hash[key] = Time.parse(line[index])
          when :unixtime
            hash[key] = Time.at(line[index].to_i)
          when :date
            hash[key] = Date.parse(line[index])
          when :boolean
            hash[key] = line[index].to_s == "true" ? true : false
          when :ipaddr
            hash[key] = IPAddr.new(line[index])
          when :uri
            hash[key] = URI.parse(line[index])
          when :regexp
            hash[key] = Regexp.compile(line[index])
          else
            raise "not implemented yet"
          end
        rescue => ex
          puts ex
          puts ex.backtrace.join($/)

          if @@on_error_go_to_next_line
            puts "========"
            puts "Ignore error!!"
            puts "========"
            next
          else
            raise ex
          end
        end

        ## filterは最後に適用
        if opt[:filter]
          hash[key] = opt[:filter].call(hash[key])
        end
      end
    }
    records << hash
  }
  self.new(records)
end

.load_file(path, encoding = nil) ⇒ Object 



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# File 'lib/csvmapper.rb', line 39

def self.load_file(path, encoding = nil)
  data = open(path).read
  data.force_encoding(encoding) if encoding
  self.load(data)
end

.on_error_go_to_next_line ⇒ Object 



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# File 'lib/csvmapper.rb', line 145

def self.on_error_go_to_next_line
  @@on_error_go_to_next_line = true
end

Instance Method Details

#[](index) ⇒ Object 



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# File 'lib/csvmapper.rb', line 180

def [](index)
  row(index)
end

#cols ⇒ Object 



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# File 'lib/csvmapper.rb', line 172

def cols
  if @records.nil? or @records.empty?
    return 0
  else
    return @records.first.size
  end
end

#each(&block) ⇒ Object 



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# File 'lib/csvmapper.rb', line 185

def each(&block)
  matched = []
  if @where
    @records.each{ |record|
      @where.each{ |key, value|
        if record.send(key) == value
          matched << record
        end
      }
    }
  else
    matched = @records
  end

  matched.each{ |e|
    block.call(e)
  }
end

#grouped_by(field) ⇒ Object 



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# File 'lib/csvmapper.rb', line 227

def grouped_by(field)
  hash = {}
  each{|e|
    k = e[field]
    hash[k] ||= []
    hash[k] << e
  }
  hash
end

#order(options = {}) ⇒ Object 



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# File 'lib/csvmapper.rb', line 211

def order(options={})
  @order = Hashie::Clash.new(options) if @order.nil?
  @order.merge! options
  self
end

#row(index) ⇒ Object 



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# File 'lib/csvmapper.rb', line 163

def row(index)
  @records[index]
end

#rows ⇒ Object

size



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# File 'lib/csvmapper.rb', line 168

def rows
  @records.size
end

#to_hash ⇒ Object 



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# File 'lib/csvmapper.rb', line 217

def to_hash
  @records.map{ |record|
    record.to_hash
  }
end

#to_json ⇒ Object 



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# File 'lib/csvmapper.rb', line 223

def to_json
  @records.to_json
end

#where(options = {}) ⇒ Object

arel style finder



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# File 'lib/csvmapper.rb', line 205

def where(options={})
  @where = Hashie::Clash.new(options) if @where.nil?
  @where.merge! options
  self
end