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Diffstat (limited to 'doc')
| -rw-r--r-- | doc/csv/recipes/parsing.rdoc | 34 |
1 files changed, 34 insertions, 0 deletions
diff --git a/doc/csv/recipes/parsing.rdoc b/doc/csv/recipes/parsing.rdoc index f7967c2d47..cdb58e4612 100644 --- a/doc/csv/recipes/parsing.rdoc +++ b/doc/csv/recipes/parsing.rdoc @@ -58,6 +58,9 @@ All code snippets on this page assume that the following has been executed: - {Using Multiple Header Converters}[#label-Using+Multiple+Header+Converters] - {Recipe: Specify Multiple Header Converters in Option :header_converters}[#label-Recipe-3A+Specify+Multiple+Header+Converters+in+Option+-3Aheader_converters] - {Recipe: Specify Multiple Header Converters in a Custom Header Converter List}[#label-Recipe-3A+Specify+Multiple+Header+Converters+in+a+Custom+Header+Converter+List] +- {Diagnostics}[#label-Diagnostics] + - {Recipe: Capture Unconverted Fields}[#label-Recipe-3A+Capture+Unconverted+Fields] + - {Recipe: Capture Field Info}[#label-Recipe-3A+Capture+Field+Info] === Source Formats @@ -507,3 +510,34 @@ Apply multiple header converters by defining and registering a custom header con source = "NAME,VALUE\nfoo,0\nbar,1.0\nbaz,2.0\n" parsed = CSV.parse(source, headers: true, header_converters: :my_header_converters) parsed.headers # => [:name, :value] + +=== Diagnostics + +==== Recipe: Capture Unconverted Fields + +To capture unconverted field values, use option +:unconverted_fields+: + source = "Name,Value\nfoo,0\nbar,1\nbaz,2\n" + parsed = CSV.parse(source, converters: :integer, unconverted_fields: true) + parsed # => [["foo", "0"], ["bar", "1"], ["baz", "2"]] + parsed.each {|row| p row.unconverted_fields } +Output: + ["Name", "Value"] + ["foo", "0"] + ["bar", "1"] + ["baz", "2"] + +==== Recipe: Capture Field Info + +To capture field info in a custom converter, accept two block arguments. +The first is the field value; the second is a +CSV::FieldInfo+ object: + strip_converter = proc {|field, field_info| p field_info; field.strip } + source = " foo , 0 \n bar , 1 \n baz , 2 \n" + parsed = CSV.parse(source, converters: strip_converter) + parsed # => [["foo", "0"], ["bar", "1"], ["baz", "2"]] +Output: + #<struct CSV::FieldInfo index=0, line=1, header=nil> + #<struct CSV::FieldInfo index=1, line=1, header=nil> + #<struct CSV::FieldInfo index=0, line=2, header=nil> + #<struct CSV::FieldInfo index=1, line=2, header=nil> + #<struct CSV::FieldInfo index=0, line=3, header=nil> + #<struct CSV::FieldInfo index=1, line=3, header=nil>
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