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parseForecastText.js
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parseForecastText.js
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/* eslint-env node */
'use strict';
module.exports = {
parseForecastText,
getForecastObject
};
const objectAssign = require('object-assign');
const utility = require('./utility');
const getIssuedMoment = require('./getIssuedMoment').getIssuedMoment;
const _ = require('lodash');
const moment = require('moment');
function toSentenceCase(text) {
const rg = /(^\w{1}|\.\s*\w{1})/gi;
return text.toLowerCase().replace(rg, (toReplace) => {
return toReplace.toUpperCase();
});
}
function removeDayString(text) {
return text.slice(text.indexOf('...') + 3, text.length);
}
function getAdvisory(originalForecastArray) {
// get index of start of advisory
const advisoryGuessStart = _.findIndex(originalForecastArray, (line) => _.startsWith(line, '...'));
// get index of end of advisory
const advisoryGuessEnd = _.findLastIndex(originalForecastArray, (line) => _.endsWith(line, '...'));
if (advisoryGuessStart !== null) {
// create array with just advisory (if one or more exist)
const advisoryArray = _.slice(originalForecastArray, advisoryGuessStart, advisoryGuessEnd + 1);
// join lines for advisories spanning multiple lines
const grouped = advisoryArray.reduce((result, line, index) => {
if (_.startsWith(line, '...') === true && _.endsWith(line, '...') === true) {
result.advisoryArray.push(line);
return result;
}
if (_.startsWith(line, '...') === true && _.endsWith(line, '...') === false) {
result.start = index;
return result;
}
if (_.startsWith(line, '...') === false && _.endsWith(line, '...') === true) {
result.advisoryArray.push(_.slice(advisoryArray, result.start, index + 1).join(' '));
return result;
}
return result;
}, { advisoryArray: [], start: null });
return grouped.advisoryArray.map((line) => {
return toSentenceCase(_.slice(line, 3, line.length - 3).join(''));
});
}
return false;
}
function getDayByDayArray(originalForecastArray) {
// get array of indexes representing the start of a new day forecast
const indexes = originalForecastArray.map((line, index) => {
if ((line[1] !== '.' && line[0] === '.') || line[0] === '$') {
return index;
}
}).filter((index) => index);
// 1. slice originalForecastArray with the in-between the start of day and start of the next day
// 2. join the new array together with a space in-between each line.
return indexes.map((start, i) => {
return _.slice(originalForecastArray, start, indexes[i + 1]).join(' ');
}).slice(0, -1); // slice the end off (empty);
}
function getForecastObject(dayByDayArray, issuedMoment) {
return dayByDayArray.reduce((days, text, index) => {
const dayString = text.substring(1, text.indexOf('...'));
function checkDay(check) {
return dayString.indexOf(check) > -1;
}
function calculateSetDayTo(weekdayIndex, currentDay, today) {
if (today === true) {
return weekdayIndex;
}
if (weekdayIndex < currentDay) {
return weekdayIndex + 7;
}
return weekdayIndex;
}
try {
let today = false;
let isNightForecast = dayString.indexOf('NIGHT') > -1 ? true : false;
let weekdayIndex = _.findIndex(utility.weekdays, checkDay);
weekdayIndex = weekdayIndex === -1 ? _.findIndex(utility.weekdaysShort, checkDay) : weekdayIndex;
if (weekdayIndex === -1) {
if (utility.todayAliasesIsNightTime[dayString] !== null) {
weekdayIndex = issuedMoment.day(); // sets index as forecast day
isNightForecast = utility.todayAliasesIsNightTime[dayString];
today = true;
} else {
throw new Error('getForecastObject failed. Can\'t find weekdayIndex');
}
}
const weekday = utility.weekdays[weekdayIndex];
const order = index + 1;
const setDayTo = calculateSetDayTo(weekdayIndex, issuedMoment.day(), today);
const forecastMoment = new moment(issuedMoment);
forecastMoment.day(setDayTo);
if (isNightForecast) {
forecastMoment.hour(17);
} else {
forecastMoment.hour(9);
}
const date = forecastMoment.valueOf();
days[order] = {
order, date, dayString, weekday, isNightForecast, forecastMoment,
text: toSentenceCase(removeDayString(text))
};
} catch (exception) {
throw exception;
} finally {
return days;
}
}, {});
}
function parseForecastText(text) {
try {
const originalForecastArray = text.split('\n');
const dayByDayArray = getDayByDayArray(originalForecastArray);
const issuedMoment = getIssuedMoment(originalForecastArray);
const advisory = getAdvisory(originalForecastArray);
const forecasts = getForecastObject(dayByDayArray, issuedMoment);
return objectAssign({}, forecasts, {
advisory,
issuedMoment
});
} catch (exception) {
throw exception;
}
}