tupelo.csv — tupelo 23.03.17

Utils for reading CSV (comma-separated-value) formatted files.

attrs->entities clj

(attrs->entities attrs)

Inputs: [attrs :- tsk/Map] Returns: [tsk/Map]

Converts a map of attribute-vectors into a vector of entity-maps. Not lazy.

csv->attrs clj

(csv->attrs csv-input)

(csv->attrs csv-input opts)

Inputs: ([csv-input :- CsvInput] [csv-input :- CsvInput opts :- tsk/KeyMap]) Returns: tsk/KeyMap

[csv-input & {:as opts} ] Returns a map of attributes constructed from the columns of csv-input. The first line is assumed to be column label strings, which are (safely) converted into keywords. The returned map has one entry for each column label keyword. The corresponding value for each keyword is a vector of string data taken from each subsequent line in the file. See tupelo.csv/parse->entities for options. Not lazy.

csv->entities clj

(csv->entities csv-input)

(csv->entities csv-input opts)

Inputs: ([csv-input :- CsvInput] [csv-input :- CsvInput opts :- tsk/KeyMap]) Returns: [tsk/Map]

[csv-input] [csv-input opts-map]

Load csv-input (Reader or String), returning a vector of maps. The first line is assumed to be column label strings, which are (safely) converted into keywords. String data from each subsequent line is paired with the corresponding column keyword to construct a map for that line. Default delimiter is the comma character (i.e. ,) but may be changed using the syntax such as:

 (parse-csv->row-maps <csv-data-src> {:delimiter \}|)

to select the pipe character (i.e. |) as the delimiter.

<csv-data-source> is either a multi-line-string, or a java.io.Reader. Default options map:

  {:key-fn           str/trim
   :val-fn           str/trim
   :headers?         true       ; is header row present?
   :headers-to-use   nil        ; vec of string/keyword to use as headers
   :keywordize-keys? true
   :separator        \,
   :quote            \"
  }

csv->table clj

(csv->table csv-input)

(csv->table csv-input opts)

Inputs: ([csv-input :- CsvInput] [csv-input :- CsvInput opts :- tsk/KeyMap]) Returns: [[s/Str]]

Load csv-input (Reader or String) into a string table (vector of vectors). Default options:

 {:separator \,
  :quote     \"}

entities->attrs clj

(entities->attrs entities)

Inputs: [entities :- [tsk/Map]] Returns: tsk/Map

Converts a sequence of entity-maps into a map of column-vectors. Not lazy.

entities->csv clj

(entities->csv entities)

(entities->csv entities opts)

Inputs: ([entities :- [tsk/Map]] [entities :- [tsk/Map] opts :- tsk/KeyMap]) Returns: s/Str

Writes a sequence of EDN maps to a multi-line CSV string. Keys are output in sorted order. Optionally accepts a map-key conversion function. Default options:

  {:separator     \,
   :quote         \"
   :key-fn        kw->str
   :val-fn        ->str
   :newline       :lf     ; or :cr+lf
   :force-quote?   false
  }