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[ruby/csv] Enhanced RDoc for CSV::Row (#171)

cced8d8de9
This commit is contained in:
Burdette Lamar 2020-09-05 17:03:37 -05:00 committed by Sutou Kouhei
parent 31ccc233b1
commit e8954fa13b
Notes: git 2020-11-24 09:34:32 +09:00
2 changed files with 119 additions and 31 deletions

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@ -279,17 +279,34 @@ class CSV
#
# :call-seq:
# <<( field )
# <<( header_and_field_array )
# <<( header_and_field_hash )
# row << [header, value] -> self
# row << hash -> self
# row << value -> self
#
# If a two-element Array is provided, it is assumed to be a header and field
# and the pair is appended. A Hash works the same way with the key being
# the header and the value being the field. Anything else is assumed to be
# a lone field which is appended with a +nil+ header.
# Adds a field to +self+; returns +self+:
#
# This method returns the row for chaining.
# If the argument is a 2-element \Array <tt>[header, value]</tt>,
# a field is added with the given +header+ and +value+:
# source = "Name,Name,Name\nFoo,Bar,Baz\n"
# table = CSV.parse(source, headers: true)
# row = table[0]
# row << ['NAME', 'Bat']
# row # => #<CSV::Row "Name":"Foo" "Name":"Bar" "Name":"Baz" "NAME":"Bat">
#
# If the argument is a \Hash, each <tt>key-value</tt> pair is added
# as a field with header +key+ and value +value+.
# source = "Name,Name,Name\nFoo,Bar,Baz\n"
# table = CSV.parse(source, headers: true)
# row = table[0]
# row << {NAME: 'Bat', name: 'Bam'}
# row # => #<CSV::Row "Name":"Foo" "Name":"Bar" "Name":"Baz" NAME:"Bat" name:"Bam">
#
# Otherwise, the given +value+ is added as a field with no header.
# source = "Name,Name,Name\nFoo,Bar,Baz\n"
# table = CSV.parse(source, headers: true)
# row = table[0]
# row << 'Bag'
# row # => #<CSV::Row "Name":"Foo" "Name":"Bar" "Name":"Baz" nil:"Bag">
def <<(arg)
if arg.is_a?(Array) and arg.size == 2 # appending a header and name
@row << arg
@ -302,13 +319,15 @@ class CSV
self # for chaining
end
# :call-seq:
# row.push(*values) ->self
#
# A shortcut for appending multiple fields. Equivalent to:
#
# args.each { |arg| csv_row << arg }
#
# This method returns the row for chaining.
#
# Appends each of the given +values+ to +self+ as a field; returns +self+:
# source = "Name,Name,Name\nFoo,Bar,Baz\n"
# table = CSV.parse(source, headers: true)
# row = table[0]
# row.push('Bat', 'Bam')
# row # => #<CSV::Row "Name":"Foo" "Name":"Bar" "Name":"Baz" nil:"Bat" nil:"Bam">
def push(*args)
args.each { |arg| self << arg }
@ -317,14 +336,39 @@ class CSV
#
# :call-seq:
# delete( header )
# delete( header, offset )
# delete( index )
# delete(index) -> [header, value] or nil
# delete(header) -> [header, value] or empty_array
# delete(header, offset) -> [header, value] or empty_array
#
# Removes a pair from the row by +header+ or +index+. The pair is
# located as described in CSV::Row.field(). The deleted pair is returned,
# or +nil+ if a pair could not be found.
# Removes a specified field from +self+; returns the 2-element \Array
# <tt>[header, value]</tt> if the field exists.
#
# If an \Integer argument +index+ is given,
# removes and returns the field at offset +index+,
# or returns +nil+ if the field does not exist:
# source = "Name,Name,Name\nFoo,Bar,Baz\n"
# table = CSV.parse(source, headers: true)
# row = table[0]
# row.delete(1) # => ["Name", "Bar"]
# row.delete(50) # => nil
#
# Otherwise, if the single argument +header+ is given,
# removes and returns the first-found field with the given header,
# of returns a new empty \Array if the field does not exist:
# source = "Name,Name,Name\nFoo,Bar,Baz\n"
# table = CSV.parse(source, headers: true)
# row = table[0]
# row.delete('Name') # => ["Name", "Foo"]
# row.delete('NAME') # => []
#
# If argument +header+ and \Integer argument +offset+ are given,
# removes and returns the first-found field with the given header
# whose +index+ is at least as large as +offset+:
# source = "Name,Name,Name\nFoo,Bar,Baz\n"
# table = CSV.parse(source, headers: true)
# row = table[0]
# row.delete('Name', 1) # => ["Name", "Bar"]
# row.delete('NAME', 1) # => []
def delete(header_or_index, minimum_index = 0)
if header_or_index.is_a? Integer # by index
@row.delete_at(header_or_index)
@ -335,15 +379,21 @@ class CSV
end
end
# :call-seq:
# row.delete_if {|header, value| ... } -> self
#
# The provided +block+ is passed a header and field for each pair in the row
# and expected to return +true+ or +false+, depending on whether the pair
# should be deleted.
# Removes fields from +self+ as selected by the block; returns +self+.
#
# This method returns the row for chaining.
#
# If no block is given, an Enumerator is returned.
# Removes each field for which the block returns a truthy value:
# source = "Name,Name,Name\nFoo,Bar,Baz\n"
# table = CSV.parse(source, headers: true)
# row = table[0]
# row.delete_if {|header, value| value.start_with?('B') } # => true
# row # => #<CSV::Row "Name":"Foo">
# row.delete_if {|header, value| header.start_with?('B') } # => false
#
# If no block is given, returns a new Enumerator:
# row.delete_if # => #<Enumerator: #<CSV::Row "Name":"Foo">:delete_if>
def delete_if(&block)
return enum_for(__method__) { size } unless block_given?
@ -352,14 +402,52 @@ class CSV
self # for chaining
end
# :call-seq:
# self.fields(*specifiers)
#
# This method accepts any number of arguments which can be headers, indices,
# Ranges of either, or two-element Arrays containing a header and offset.
# Each argument will be replaced with a field lookup as described in
# CSV::Row.field().
# Returns field values per the given +specifiers+, which may be any mixture of:
# - \Integer index.
# - \Range of \Integer indexes.
# - 2-element \Array containing a header and offset.
# - Header.
# - \Range of headers.
#
# If called with no arguments, all fields are returned.
# For +specifier+ in one of the first four cases above,
# returns the result of <tt>self.field(specifier)</tt>; see #field.
#
# Although there may be any number of +specifiers+,
# the examples here will illustrate one at a time.
#
# When the specifier is an \Integer +index+,
# returns <tt>self.field(index)</tt>L
# source = "Name,Name,Name\nFoo,Bar,Baz\n"
# table = CSV.parse(source, headers: true)
# row = table[0]
# row.fields(1) # => ["Bar"]
#
# When the specifier is a \Range of \Integers +range+,
# returns <tt>self.field(range)</tt>:
# row.fields(1..2) # => ["Bar", "Baz"]
#
# When the specifier is a 2-element \Array +array+,
# returns <tt>self.field(array)</tt>L
# row.fields('Name', 1) # => ["Foo", "Bar"]
#
# When the specifier is a header +header+,
# returns <tt>self.field(header)</tt>L
# row.fields('Name') # => ["Foo"]
#
# When the specifier is a \Range of headers +range+,
# forms a new \Range +new_range+ from the indexes of
# <tt>range.start</tt> and <tt>range.end</tt>,
# and returns <tt>self.field(new_range)</tt>:
# source = "Name,NAME,name\nFoo,Bar,Baz\n"
# table = CSV.parse(source, headers: true)
# row = table[0]
# row.fields('Name'..'NAME') # => ["Foo", "Bar"]
#
# Returns all fields if no argument given:
# row.fields # => ["Foo", "Bar", "Baz"]
def fields(*headers_and_or_indices)
if headers_and_or_indices.empty? # return all fields--no arguments
@row.map(&:last)