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index.js
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index.js
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'use strict';
/* core */
const Promise = require('bluebird');
const Through2 = require('through2');
const ReadFile = require('fs').createReadStream;
const ForEach = [].forEach;
/* addons */
const PDFkit = require('pdfkit');
const WriteFile = require('fs').createWriteStream;
/* module to be exposed */
function Punc(filePath, options){
options = validateOptions(filePath, options);
let punctuationStore = [];
let wordsPerSent = 0;
let spacedOutBody = '';
return new Promise((resolve, reject) => {
ReadFile(filePath, options.encoding)
.pipe(removeAndReplace(/[\r\n]/g, ''))
.pipe(removeAndReplace(/[\s]+/g, ' '))
.pipe(findAndCount(options.mapping, punctuationStore))
.pipe(findWordsPerSentence(count => wordsPerSent = count))
.pipe(removeAndReplace(/[a-zA-Z\d]+/g, ' ', spaced => spacedOutBody = spaced))
.on('data', _ => _)
.on('end', _ => {
return resolve({ body: punctuationStore.join('')
, count: options.mapping
, wordsPerSentence: wordsPerSent
, spaced: spacedOutBody
});
})
.on('error', error => reject(error))
;
});
}
/* module helpers */
function removeAndReplace (regex, replace, dest) {
return Through2.obj(function(chunk, _, callback) {
chunk = chunk.replace(regex, replace);
if (dest) dest(chunk);
callback(null, chunk);
});
}
function findWordsPerSentence (changeCount) {
return Through2.obj(function(chunk, _, callback) {
let periodCount = (chunk.match(/\.|\?|\!/g) || []).length;
let wordCount = chunk.split(' ').length;
changeCount(wordCount / periodCount);
callback(null, chunk);
});
}
function findAndCount (map, dest) {
return Through2.obj(function(chunk, _, callback) {
ForEach.call(chunk, punctuation => {
if ( punctuation in map ) {
map[ punctuation ]++;
dest.push(punctuation);
}
});
callback(null, chunk);
});
}
function createPDF (filePath, options) {
options = validateOptions(filePath, options);
return new Promise((resolve, reject) => {
ReadFile(filePath, options.encoding)
.pipe(removeAndReplace(/[a-zA-Z\d]+/g, ' '))
.on('data', data => {
let pdf = new PDFkit();
let newFileName = `${ filePath }-visual.pdf`;
pdf.pipe(WriteFile(newFileName));
pdf
.font('lib/fonts/Inconsolata-Regular.ttf')
.fontSize(25)
.text(data)
;
pdf.end();
resolve({success: true, pathToFile: newFileName });
})
.on('end', _ => _)
.on('error', error => reject(error))
;
});
}
function validateOptions (filePath, options) {
if (!filePath) throw new Error('Punc.createPDF: file path not given.');
if (!options) {
options = { encoding: 'utf8', mapping: defaultMapping() };
} else if (typeof options === 'string') {
options = { encoding: options };
} else if (typeof options !== 'object') {
throw new TypeError(`Punc.createPDF: expected options to be either
an object or a string, but got ${typeof options} instead`
);
}
return options;
};
function defaultMapping() {
return { ';': 0
, ':': 0
, "'": 0
, '"': 0
, ',': 0
, '!': 0
, '?': 0
, '.': 0
, '(': 0
, ')': 0
, '-': 0
};
}
/* additional module methods */
Punc.createPDF = createPDF;
/* THE TRUTH IS OUT THERE */
module.exports = Punc;