Added micro parser

This commit is contained in:
2020-12-23 22:43:44 +11:00
commit 0a007862e7
3 changed files with 77 additions and 0 deletions

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The MIT License (MIT)
Copyright (c) 2020 Dominic Masters.
Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in
all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
THE SOFTWARE.

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# Micro CSV
Micro CSV Parser for JavaScript and Google Script. Designed to be small,
efficient and no dependencies.
## Usage
Only one method is provided;
```js
const csv = 'Name,Age,Location\nDom,26,Sydney\nSteve,30,New York';
parseCSV(csv, function(line) {
console.log(line.name);//Dom then Steve
})
```
To stay efficient we ask for a callback that is fired for every line parsed.

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function parseCSV(csv, onLine) {
const lines = csv.split(/\r?\n/);
let headers = null;
for(let i = 0; i < lines.length; i++) {
let line = lines[i].trim();
if(!line.length) continue;
let lineArray = [];
let currentValue = '';
let encapsulated = false;
for(let j = 0; j < line.length; j++) {
let c = line[j];
if(!encapsulated && c == ',') {
//Comma, make new cell
lineArray.push(currentValue);
currentValue = '';
continue;
} else if(c == '"') {
//Quote, begin string encapsulation
encapsulated = !encapsulated;
continue;
}
currentValue += `${c}`;
}
lineArray.push(currentValue);
//Is this the headers?
if(!headers) {
headers = lineArray;
continue;
}
//This is a line
let x = {};
for(let j = 0; j < headers.length; j++) {
x[headers[j]] = lineArray[j] || '';
}
onLine(x);
}
}