SET search_path = py_functions, pg_catalog;

-- Name: _dateRangeStart(); Type: FUNCTION; Schema: py_functions; Owner: bien

--

CREATE FUNCTION "_dateRangeStart"() RETURNS trigger

    LANGUAGE plpgsql IMMUTABLE

    AS $$

BEGIN

    new.result := (SELECT py_functions.parse_date_range(new.value));

    RETURN new;

END;

$$;

ALTER FUNCTION py_functions."_dateRangeStart"() OWNER TO bien;

--

-- Name: parse_date_range(text); Type: FUNCTION; Schema: py_functions; Owner: bien

--

CREATE FUNCTION parse_date_range(str_ text) RETURNS text[]

    LANGUAGE plpythonu IMMUTABLE STRICT

    AS $$

import re

def single_space(str_): return re.sub(r' {2,}', r' ', str_.strip())

def could_be_year(str_): return str_.isdigit() and len(str_) == 4

def could_be_day(str_): return str_.isdigit() and len(str_) <= 2

range_sep='-'

part_sep=' '

default = (str_, None)

# range_sep might be used as date part separator instead

if str_.find(part_sep) < 0: return default

start, sep, end = str_.partition(range_sep)

if sep == '': return default # not a range

start, end = (single_space(d).split(part_sep) for d in (start, end))

# Has form M D1-D2 or M D1-D2 Y (not M1 Y1-M2 Y2 or M1 D1-M2 D2)

if len(start) == 2 and (len(end) == 1 or (

        len(end) == 2 and could_be_day(start[-1]) and could_be_day(end[0])

        and could_be_year(end[-1])

    )):

    end.insert(0, start[0]) # make end fully specified

ct_diff = len(end) - len(start)

# Has form D1-D2 M Y, M1 D1-M2 D2 Y, M1-M2 Y, etc.

if ct_diff > 0: start += end[-ct_diff:] # make start fully specified

# Other forms are invalid and will be left as-is

return [part_sep.join(d) for d in (start, end)]

$$;

ALTER FUNCTION py_functions.parse_date_range(str_ text) OWNER TO bien;

SET default_tablespace = '';

SET default_with_oids = false;

--

-- Name: _dateRangeStart; Type: TABLE; Schema: py_functions; Owner: bien; Tablespace: 

--

CREATE TABLE "_dateRangeStart" (

    result text,

    not_null_col boolean DEFAULT true NOT NULL,

    value text

);

ALTER TABLE py_functions."_dateRangeStart" OWNER TO bien;

--

-- Name: _dateRangeStart_unique; Type: INDEX; Schema: py_functions; Owner: bien; Tablespace: 

--

CREATE UNIQUE INDEX "_dateRangeStart_unique" ON "_dateRangeStart" USING btree (functions.ensure_not_null(value));

--

-- Name: _dateRangeStart; Type: TRIGGER; Schema: py_functions; Owner: bien

--

CREATE TRIGGER "_dateRangeStart" BEFORE INSERT OR UPDATE ON "_dateRangeStart" FOR EACH ROW EXECUTE PROCEDURE "_dateRangeStart"();

--