--
-- PostgreSQL database dump
--

SET statement_timeout = 0;
SET client_encoding = 'UTF8';
SET standard_conforming_strings = on;
SET check_function_bodies = false;
SET client_min_messages = warning;

--
-- Name: py_functions; Type: SCHEMA; Schema: -; Owner: bien
--

CREATE SCHEMA py_functions;


ALTER SCHEMA py_functions OWNER TO bien;

--
-- Name: SCHEMA py_functions; Type: COMMENT; Schema: -; Owner: bien
--

COMMENT ON SCHEMA py_functions IS 'IMPORTANT: Functions must always return NULL in place of '''' (the empty string). This ensures that empty strings do not find their way into VegBIEN.';


SET search_path = py_functions, pg_catalog;

--
-- Name: _date(timestamp with time zone); Type: FUNCTION; Schema: py_functions; Owner: bien
--

CREATE FUNCTION _date(date timestamp with time zone) RETURNS timestamp with time zone
    LANGUAGE sql IMMUTABLE STRICT
    AS $_$
SELECT $1
$_$;


ALTER FUNCTION py_functions._date(date timestamp with time zone) OWNER TO bien;

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

CREATE FUNCTION _date(year text DEFAULT NULL::text, month text DEFAULT NULL::text, day text DEFAULT NULL::text) RETURNS text
    LANGUAGE plpython3u IMMUTABLE
    AS $$
global date, year, month, day

import datetime

def e_msg(e): return e.args[0].rstrip()

# Year is required
if year == None:
    if month == None and day == None: return None # entire date is empty
    else: raise AssertionError(
        'null value in column "year" violates not-null constraint')

# Convert month name to number
if month != None and not month.isdigit(): # month is name
    month = str(datetime.datetime.strptime(month, '%b').month)

if month == None: month = 1
if day == None: day = 1
year, month, day = map(int, (year, month, day))

for try_num in range(2):
    try:
        date = datetime.date(year, month, day)
        break
    except ValueError as e:
        if try_num > 0: raise # exception still raised after retry
        msg = e_msg(e)
        if msg == 'month must be in 1..12': # try swapping month and day
            month, day = day, month
        else: raise

return str(date)
$$;


ALTER FUNCTION py_functions._date(year text, month text, day text) OWNER TO bien;

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

CREATE FUNCTION "_dateRangeEnd"(value text) RETURNS text
    LANGUAGE sql IMMUTABLE STRICT
    AS $_$
SELECT (py_functions.parse_date_range($1))[2]
$_$;


ALTER FUNCTION py_functions."_dateRangeEnd"(value text) OWNER TO bien;

--
-- Name: _dateRangeEnd(timestamp with time zone); Type: FUNCTION; Schema: py_functions; Owner: bien
--

CREATE FUNCTION "_dateRangeEnd"(value timestamp with time zone) RETURNS timestamp with time zone
    LANGUAGE sql IMMUTABLE STRICT
    AS $_$
SELECT $1
$_$;


ALTER FUNCTION py_functions."_dateRangeEnd"(value timestamp with time zone) OWNER TO bien;

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

CREATE FUNCTION "_dateRangeStart"(value text) RETURNS text
    LANGUAGE sql IMMUTABLE STRICT
    AS $_$
SELECT (py_functions.parse_date_range($1))[1]
$_$;


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

--
-- Name: _dateRangeStart(timestamp with time zone); Type: FUNCTION; Schema: py_functions; Owner: bien
--

CREATE FUNCTION "_dateRangeStart"(value timestamp with time zone) RETURNS timestamp with time zone
    LANGUAGE sql IMMUTABLE STRICT
    AS $_$
SELECT $1
$_$;


ALTER FUNCTION py_functions."_dateRangeStart"(value timestamp with time zone) OWNER TO bien;

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

CREATE FUNCTION "_namePart"(first text DEFAULT NULL::text, middle text DEFAULT NULL::text, last text DEFAULT NULL::text) RETURNS text
    LANGUAGE plpython3u IMMUTABLE
    AS $$
params = dict(first=first, middle=middle, last=last)

def none_if(val, *none_vals):
    for none_val in none_vals:
        if val == none_val: return None
    return val

_name_parts_slices_items = [
    ('first', slice(None, -1)),
    ('middle', slice(1, -1)),
    ('last', slice(-1, None)),
]
name_parts_slices = dict(_name_parts_slices_items)
name_parts = [name for name, slice_ in _name_parts_slices_items]

def _name(items):
    items = dict(items)
    parts = []
    for part in name_parts:
        if part in items: parts.append(items[part])
    return none_if(' '.join(parts), '')

out_items = []
for part, value in params.iteritems():
    if value == None: continue
    
    try: slice_ = name_parts_slices[part]
    except KeyError: pass # a non-value column
    else: out_items.append((part, ' '.join(value.split(' ')[slice_])))

return _name(out_items)
$$;


ALTER FUNCTION py_functions."_namePart"(first text, middle text, last text) 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 plpython3u 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_, str_)
# 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;

--
-- PostgreSQL database dump complete
--