mirror of
https://github.com/red-data-tools/YouPlot.git
synced 2025-05-05 22:31:11 +08:00
88 lines
2.2 KiB
Ruby
88 lines
2.2 KiB
Ruby
# frozen_string_literal: true
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require 'csv'
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module YouPlot
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# Module to handle DSV (Delimiter-separated values) format.
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# Extract header and series.
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module DSV
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module_function
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def parse(input, delimiter, headers, transpose)
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# Parse as CSV
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arr = CSV.parse(input, col_sep: delimiter)
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# Remove blank lines
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arr.delete_if do |i|
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i == [] or i.all?(&:nil?)
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end
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# get header
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headers = get_headers(arr, headers, transpose)
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# get series
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series = get_series(arr, headers, transpose)
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# Return if No header
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return Data.new(headers, series) if headers.nil?
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# Warn if header contains nil
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warn "\e[35mHeaders contains nil in it.\e[0m" if headers.include?(nil)
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# Warn if header contains ''
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warn "\e[35mHeaders contains \"\" in it.\e[0m" if headers.include? ''
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# Make sure the number of elements in the header matches the number of series.
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h_size = headers.size
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s_size = series.size
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if h_size > s_size
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warn "\e[35mThe number of headers is greater than the number of series.\e[0m"
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exit 1 if YouPlot.run_as_executable?
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elsif h_size < s_size
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warn "\e[35mThe number of headers is less than the number of series.\e[0m"
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exit 1 if YouPlot.run_as_executable?
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end
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Data.new(headers, series) if h_size == s_size
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end
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# Transpose different sized ruby arrays
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# https://stackoverflow.com/q/26016632
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def transpose2(arr)
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Array.new(arr.map(&:length).max) { |i| arr.map { |e| e[i] } }
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end
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def get_headers(arr, headers, transpose)
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# header(-)
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return nil unless headers
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# header(+) trenspose(+)
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return arr.map(&:first) if transpose
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# header(+) transpose(-)
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arr[0]
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end
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def get_series(arr, headers, transpose)
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# header(-)
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unless headers
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return arr if transpose
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return transpose2(arr)
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end
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# header(+) but no element in the series.
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# TODO: should raise error?
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return Array.new(arr[0].size, []) if arr.size == 1
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# header(+) transpose(+)
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return arr.map { |row| row[1..-1] } if transpose
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# header(+) transpose(-)
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transpose2(arr[1..-1])
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end
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end
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end
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