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Contents
# Licensed to the Apache Software Foundation (ASF) under one
# or more contributor license agreements. See the NOTICE file
# distributed with this work for additional information
# regarding copyright ownership. The ASF licenses this file
# to you under the Apache License, Version 2.0 (the
# "License"); you may not use this file except in compliance
# with the License. You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing,
# software distributed under the License is distributed on an
# "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
# KIND, either express or implied. See the License for the
# specific language governing permissions and limitations
# under the License.
module Arrow
# TODO: Almost codes should be implemented in Apache Arrow C++.
class TableFormatter
def initialize(table, options={})
@table = table
@options = options
end
def format
text = ""
columns = @table.columns
format_header(text, columns)
n_rows = @table.n_rows
return text if n_rows.zero?
border = @options[:border] || 10
n_digits = (Math.log10(n_rows) + 1).truncate
head_limit = [border, n_rows].min
head_column_values = columns.collect do |column|
column.each.take(head_limit)
end
format_rows(text,
columns,
head_column_values.transpose,
n_digits,
0)
return text if n_rows <= border
tail_start = [border, n_rows - border].max
tail_limit = n_rows - tail_start
tail_column_values = columns.collect do |column|
column.reverse_each.take(tail_limit).reverse
end
if head_limit != tail_start
format_ellipsis(text)
end
format_rows(text,
columns,
tail_column_values.transpose,
n_digits,
tail_start)
text
end
end
end
Version data entries
18 entries across 18 versions & 1 rubygems