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<a href="index.html">All files</a> dataClean.ts
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<span class="cline-any cline-neutral"> </span></td><td class="text"><pre class="prettyprint lang-js">import { ParseRuntime } from "./ParseRuntime";
import stripBom from "strip-bom";
/**
* For each data chunk coming to parser:
* 1. append the data to the buffer that is left from last chunk
* 2. check if utf8 chars being split, if does, stripe the bytes and add to left buffer.
* 3. stripBom
*/
export function prepareData(chunk: Buffer, runtime: ParseRuntime): string {
const workChunk = concatLeftChunk(chunk, runtime);
runtime.csvLineBuffer = undefined;
const cleanCSVString = cleanUtf8Split(workChunk, runtime).toString("utf8");
if (runtime.started === false) {
return stripBom(cleanCSVString);
} else {
return cleanCSVString;
}
}<span class="missing-if-branch" title="if path not taken" >I</span>
/**
* append data to buffer that is left form last chunk
*/
function concatLeftChunk(chunk: Buffer, runtime: ParseRuntime): Buffer {
if (runtime.csvLineBuffer && runtime.csvLineBuffer.length > 0) {
return Buffer.concat([runtime.csvLineBuffer, chunk]);
} else {
return chunk;
}
}
/**
* check if utf8 chars being split, if does, stripe the bytes and add to left buffer.
*/
function cleanUtf8Split(chunk: Buffer, runtime: ParseRuntime): Buffer {
let idx = chunk.length - 1;
/**
* From Keyang:
* The code below is to check if a single utf8 char (which could be multiple bytes) being split.
* If the char being split, the buffer from two chunk needs to be concat
* check how utf8 being encoded to understand the code below.
* If anyone has any better way to do this, please let me know.
*/
if ((chunk[idx] & 1 << 7) != 0) {
while ((chunk[idx] & 3 << 6) === 128) {
idx--;
}
idx--;
}
if (idx != chunk.length - 1) {
runtime.csvLineBuffer = chunk.slice(idx + 1);
return chunk.slice(0, idx + 1)
// var _cb=cb;
// var self=this;
// cb=function(){
// if (self._csvLineBuffer){
// self._csvLineBuffer=Buffer.concat([bufFromString(self._csvLineBuffer,"utf8"),left]);
// }else{
// self._csvLineBuffer=left;
// }
// _cb();
// }
} else {
return chunk;
}
}</pre></td></tr>
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