extend number decoder to support parsing precision point numbers

MarcCoquand · May 25, 2021 · 9392764 · 9392764
1 parent 90e9bae
commit 9392764
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Showing 3 changed files with 11 additions and 2 deletions.
diff --git a/package.json b/package.json
@@ -1,5 +1,5 @@
 {
-  "version": "6.1.0",
+  "version": "6.1.1",
   "license": "MIT",
   "main": "dist/index.js",
   "typings": "dist/index.d.ts",

diff --git a/src/index.ts b/src/index.ts
@@ -5,8 +5,12 @@ const isDate = (d: Date): boolean => !isNaN(d.getDate());
 const isISO = (str: string): boolean =>
   str.match(/(\d{4})-(\d{2})-(\d{2})/) !== null;
 const isInteger = (n: number): boolean => Math.floor(n) === n && n !== Infinity;
+var numberReSnippet =
+  '(?:NaN|-?(?:(?:\\d+|\\d*\\.\\d+)(?:[E|e][+|-]?\\d+)?|Infinity))';
+var matchOnlyNumberRe = new RegExp('^(' + numberReSnippet + ')$');
+
 const isStringNumber = (n: string): boolean =>
-  n.length !== 0 && n.match(/^[+-]?\d+(\.\d+)?$/) !== null;
+  n.length !== 0 && n.match(matchOnlyNumberRe) !== null;
 
 export { DecodeError };
 export class ValidationFailedError extends Error {

diff --git a/test/decoder.test.ts b/test/decoder.test.ts
@@ -13,6 +13,11 @@ describe('Number decoder', () => {
       })
     );
   });
+  it('decodes floating numbers', () => {
+    const res = Decoder.number.run('-4.44089e-16');
+
+    expect(res).toEqual({ type: 'OK', value: -4.44089e-16 });
+  });
   it('does not decode invalid data', () => {
     fc.assert(
       fc.property(fc.anything(), (anything: any) => {