Class: Csvlint::Validator

Inherits:
Object
  • Object
show all
Includes:
ErrorCollector, Types
Defined in:
lib/csvlint/validate.rb

Constant Summary collapse

ERROR_MATCHERS = 
{
  "Missing or stray quote" => :stray_quote,
  "Illegal quoting" => :whitespace,
  "Unclosed quoted field" => :unclosed_quote,
}

Constants included from Types

Types::SIMPLE_FORMATS, Types::TYPE_VALIDATIONS

Instance Attribute Summary collapse

Attributes included from ErrorCollector

#errors, #info_messages, #warnings

Instance Method Summary collapse

Methods included from Types

date_format, included

Methods included from ErrorCollector

#build_errors, #build_info_messages, #build_warnings, #reset, #valid?

Constructor Details

#initialize(source, dialect = nil, schema = nil) ⇒ Validator

Returns a new instance of Validator.



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# File 'lib/csvlint/validate.rb', line 18

def initialize(source, dialect = nil, schema = nil)      
  @source = source
  @formats = []
  @schema = schema
  
  @supplied_dialect = dialect != nil
        
  @dialect = {
    "header" => true,
    "delimiter" => ",",
    "skipInitialSpace" => true,
    "lineTerminator" => :auto,
    "quoteChar" => '"'
  }.merge(dialect || {})
        
  @csv_header = @dialect["header"]
    
  @csv_options = dialect_to_csv_options(@dialect)
  @extension = parse_extension(source)
  reset
  validate
end

Instance Attribute Details

#content_type ⇒ Object (readonly)

Returns the value of attribute content_type.



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# File 'lib/csvlint/validate.rb', line 10

def content_type
  @content_type
end

#csv_header ⇒ Object (readonly)

Returns the value of attribute csv_header.



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# File 'lib/csvlint/validate.rb', line 10

def csv_header
  @csv_header
end

#data ⇒ Object (readonly)

Returns the value of attribute data.



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# File 'lib/csvlint/validate.rb', line 10

def data
  @data
end

#dialect ⇒ Object (readonly)

Returns the value of attribute dialect.



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# File 'lib/csvlint/validate.rb', line 10

def dialect
  @dialect
end

#encoding ⇒ Object (readonly)

Returns the value of attribute encoding.



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# File 'lib/csvlint/validate.rb', line 10

def encoding
  @encoding
end

#extension ⇒ Object (readonly)

Returns the value of attribute extension.



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# File 'lib/csvlint/validate.rb', line 10

def extension
  @extension
end

#headers ⇒ Object (readonly)

Returns the value of attribute headers.



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# File 'lib/csvlint/validate.rb', line 10

def headers
  @headers
end

#line_breaks ⇒ Object (readonly)

Returns the value of attribute line_breaks.



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# File 'lib/csvlint/validate.rb', line 10

def line_breaks
  @line_breaks
end

#schema ⇒ Object (readonly)

Returns the value of attribute schema.



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# File 'lib/csvlint/validate.rb', line 10

def schema
  @schema
end

Instance Method Details

#build_formats(row, line) ⇒ Object 



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# File 'lib/csvlint/validate.rb', line 198

def build_formats(row, line) 
  row.each_with_index do |col, i|
    next if col.blank?
    @formats[i] ||= []
    
    SIMPLE_FORMATS.each do |type, lambda|
      begin
        if lambda.call(col)
          @format = type
        end
      rescue ArgumentError, URI::InvalidURIError
      end
    end
    
    @formats[i] << @format
  end
end

#check_consistency ⇒ Object 



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# File 'lib/csvlint/validate.rb', line 216

def check_consistency
  percentages = []
            
  SIMPLE_FORMATS.keys.each do |type|
    @formats.each_with_index do |format,i|
      percentages[i] ||= {}
      unless format.nil?
        percentages[i][type] = format.count(type) / format.size.to_f
      end
    end
  end
        
  percentages.each_with_index do |col, i|
    next if col.values.blank?
    build_warnings(:inconsistent_values, :schema, nil, i+1) if col.values.max < 0.9
  end
end

#dialect_to_csv_options(dialect) ⇒ Object 



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# File 'lib/csvlint/validate.rb', line 186

def dialect_to_csv_options(dialect) 
    skipinitialspace = dialect["skipInitialSpace"] || true
    delimiter = dialect["delimiter"]
    delimiter = delimiter + " " if !skipinitialspace
    return {
        :col_sep => delimiter,
        :row_sep => dialect["lineTerminator"],
        :quote_char => dialect["quoteChar"],
        :skip_blanks => false
    }
end

#fetch_error(error) ⇒ Object 



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# File 'lib/csvlint/validate.rb', line 180

def fetch_error(error)
  e = error.message.match(/^([a-z ]+) (i|o)n line ([0-9]+)\.?$/i)
  message = e[1] rescue nil
  ERROR_MATCHERS.fetch(message, :unknown_error)
end

#header? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/csvlint/validate.rb', line 176

def header?
  @csv_header
end

#parse_csv(io) ⇒ Object 



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# File 'lib/csvlint/validate.rb', line 96

def parse_csv(io)
  @expected_columns = 0
  current_line = 0
  reported_invalid_encoding = false
  @col_counts = []
  
  @csv_options[:encoding] = @encoding  
  
  begin
    wrapper = WrappedIO.new( io )
    csv = CSV.new( wrapper, @csv_options )
    @data = []
    @line_breaks = csv.row_sep
    if @line_breaks != "\r\n"
      build_info_messages(:nonrfc_line_breaks, :structure)
    end
    row = nil
    loop do
     current_line = current_line + 1
     begin
       wrapper.reset_line
       row = csv.shift
       @data << row
       if row             
         if current_line == 1 && header?
           row = row.reject {|r| r.blank? }
           validate_header(row)
           @col_counts << row.size
         else               
           build_formats(row, current_line)
           @col_counts << row.reject {|r| r.blank? }.size
           @expected_columns = row.size unless @expected_columns != 0
           
           build_errors(:blank_rows, :structure, current_line, nil, wrapper.line) if row.reject{ |c| c.nil? || c.empty? }.size == 0
           
           if @schema
             @schema.validate_row(row, current_line)
             @errors += @schema.errors
             @warnings += @schema.warnings
           else
             build_errors(:ragged_rows, :structure, current_line, nil, wrapper.line) if !row.empty? && row.size != @expected_columns
           end
           
         end
       else             
         break
       end         
     rescue CSV::MalformedCSVError => e
       type = fetch_error(e)
       if type == :stray_quote && !wrapper.line.match(csv.row_sep)
         build_errors(:line_breaks, :structure)
       else
         build_errors(type, :structure, current_line, nil, wrapper.line)
       end
     end
  end
  rescue ArgumentError => ae
    build_errors(:invalid_encoding, :structure, current_line, wrapper.line) unless reported_invalid_encoding
    reported_invalid_encoding = true
  end
end

#validate ⇒ Object 



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# File 'lib/csvlint/validate.rb', line 41

def validate
  single_col = false   
  io = nil   
  begin
    io = @source.respond_to?(:gets) ? @source : open(@source, :allow_redirections=>:all)
    validate_metadata(io)
    parse_csv(io)
    sum = @col_counts.inject(:+)
    unless sum.nil?
      build_warnings(:title_row, :structure) if @col_counts.first < (sum / @col_counts.size.to_f)
    end
    build_warnings(:check_options, :structure) if @expected_columns == 1        
    check_consistency      
  rescue OpenURI::HTTPError, Errno::ENOENT
    build_errors(:not_found)
  ensure
    io.close if io && io.respond_to?(:close)
  end
end

#validate_header(header) ⇒ Object 



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# File 'lib/csvlint/validate.rb', line 158

def validate_header(header)
  names = Set.new
  header.each_with_index do |name,i|
    build_warnings(:empty_column_name, :schema, nil, i+1) if name == ""
    if names.include?(name)
      build_warnings(:duplicate_column_name, :schema, nil, i+1)
    else
      names << name
    end
  end
  if @schema
    @schema.validate_header(header)
    @errors += @schema.errors
    @warnings += @schema.warnings
  end
  return valid?
end

#validate_metadata(io) ⇒ Object 



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# File 'lib/csvlint/validate.rb', line 61

def validate_metadata(io)
  @encoding = io.charset rescue nil
  @content_type = io.content_type rescue nil
  @headers = io.meta rescue nil    
  assumed_header = undeclared_header = !@supplied_dialect
  if @headers
    if @headers["content-type"] =~ /text\/csv/
      @csv_header = true
      undeclared_header = false
      assumed_header = true
    end
    if @headers["content-type"] =~ /header=(present|absent)/
      @csv_header = true if $1 == "present"
      @csv_header = false if $1 == "absent"
      undeclared_header = false
      assumed_header = false
    end
    if @headers["content-type"] !~ /charset=/
      build_warnings(:no_encoding, :context) 
    else
      build_warnings(:encoding, :context) if @encoding != "utf-8"
    end
    build_warnings(:no_content_type, :context) if @content_type == nil
    build_warnings(:excel, :context) if @content_type == nil && @extension =~ /.xls(x)?/
    build_errors(:wrong_content_type, :context) unless (@content_type && @content_type =~ /text\/csv/)
    
    if undeclared_header
      build_errors(:undeclared_header, :structure)
      assumed_header = false
    end
    
  end
  build_info_messages(:assumed_header, :structure) if assumed_header
end