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JSON to CSV improvements

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This commit is contained in:
n1073645 2020-07-29 15:27:55 +01:00
parent c9d9730726
commit 2781640a2a
2 changed files with 115 additions and 30 deletions
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79
src/core/operations/JSONToCSV.mjs
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@ -6,6 +6,8 @@
import Operation from "../Operation.mjs";
import OperationError from "../errors/OperationError.mjs";
import * as flat from "flat";
const flatten = flat.default ? flat.default.flatten : flat.flatten;
/**
* JSON to CSV operation
@ -38,6 +40,40 @@ class JSONToCSV extends Operation {
];
}
/**
* Converts a JSON to csv equivalent.
*
* @returns {string}
*/
toCsv() {
const self = this;
// If the JSON is an array of arrays, this is easy
if (this.flattened[0] instanceof Array) {
return this.flattened
.map(row => row
.map(self.escapeCellContents.bind(self))
.join(this.cellDelim)
)
.join(this.rowDelim) +
this.rowDelim;
}
// If it's an array of dictionaries...
const header = Object.keys(this.flattened[0]);
return header
.map(self.escapeCellContents.bind(self))
.join(this.cellDelim) +
this.rowDelim +
this.flattened
.map(row => header
.map(h => row[h])
.map(self.escapeCellContents.bind(self))
.join(this.cellDelim)
)
.join(this.rowDelim) +
this.rowDelim;
}
/**
* @param {JSON} input
* @param {Object[]} args
@ -49,40 +85,23 @@ class JSONToCSV extends Operation {
// Record values so they don't have to be passed to other functions explicitly
this.cellDelim = cellDelim;
this.rowDelim = rowDelim;
const self = this;
if (!(input instanceof Array)) {
input = [input];
this.flattened = input;
if (!(this.flattened instanceof Array)) {
this.flattened = [input];
}
try {
// If the JSON is an array of arrays, this is easy
if (input[0] instanceof Array) {
return input
.map(row => row
.map(self.escapeCellContents.bind(self))
.join(cellDelim)
)
.join(rowDelim) +
rowDelim;
}
// If it's an array of dictionaries...
const header = Object.keys(input[0]);
return header
.map(self.escapeCellContents.bind(self))
.join(cellDelim) +
rowDelim +
input
.map(row => header
.map(h => row[h])
.map(self.escapeCellContents.bind(self))
.join(cellDelim)
)
.join(rowDelim) +
rowDelim;
return this.toCsv();
} catch (err) {
throw new OperationError("Unable to parse JSON to CSV: " + err.toString());
try {
this.flattened = flatten(input);
if (!(this.flattened instanceof Array)) {
this.flattened = [this.flattened];
}
return this.toCsv();
} catch (err) {
throw new OperationError("Unable to parse JSON to CSV: " + err.toString());
}
}
}