gtfs-via-postgres/lib/calendar.js

Process GTFS using PostgreSQL.

'use strict'

// https://gtfs.org/schedule/reference/#calendartxt
const beforeAll = (opt) => `\
CREATE TYPE "${opt.schema}".availability AS ENUM (
	'not_available' -- 0 – Service is not available for Mondays in the date range.
	, 'available' -- 1 – Service is available for all Mondays in the date range.
);
CREATE CAST ("${opt.schema}".availability AS text) WITH INOUT AS IMPLICIT;

CREATE TABLE "${opt.schema}".calendar (
	service_id TEXT PRIMARY KEY,
	monday "${opt.schema}".availability NOT NULL,
	tuesday "${opt.schema}".availability NOT NULL,
	wednesday "${opt.schema}".availability NOT NULL,
	thursday "${opt.schema}".availability NOT NULL,
	friday "${opt.schema}".availability NOT NULL,
	saturday "${opt.schema}".availability NOT NULL,
	sunday "${opt.schema}".availability NOT NULL,
	start_date DATE NOT NULL,
	end_date DATE NOT NULL
);

COPY "${opt.schema}".calendar (
	service_id,
	monday,
	tuesday,
	wednesday,
	thursday,
	friday,
	saturday,
	sunday,
	start_date,
	end_date
) FROM STDIN csv;
`

const availability = (val) => {
	if (val === '0') return 'not_available'
	if (val === '1') return 'available'
	throw new Error('invalid availability: ' + val)
}

const formatCalendarRow = (c) => {
	return [
		c.service_id || null,
		c.monday ? availability(c.monday) : null,
		c.tuesday ? availability(c.tuesday) : null,
		c.wednesday ? availability(c.wednesday) : null,
		c.thursday ? availability(c.thursday) : null,
		c.friday ? availability(c.friday) : null,
		c.saturday ? availability(c.saturday) : null,
		c.sunday ? availability(c.sunday) : null,
		c.start_date,
		c.end_date,
	]
}

const afterAll = `\
\\.
`

module.exports = {
	beforeAll,
	formatRow: formatCalendarRow,
	afterAll,
}