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LibJS: Add JSON.parse

This commit is contained in:
Matthew Olsson 2020-06-10 23:30:36 -07:00 committed by Andreas Kling
parent e8e728454c
commit b155e64b67
6 changed files with 218 additions and 5 deletions

View file

@ -0,0 +1,15 @@
load("test-common.js");
try {
let string = `{"var1":10,"var2":"hello","var3":{"nested":5}}`;
let object = JSON.parse(string, (key, value) => typeof value === "number" ? value * 2 : value);
assertDeepEquals(object, { var1: 20, var2: "hello", var3: { nested: 10 } });
object = JSON.parse(string, (key, value) => typeof value === "number" ? undefined : value);
assertDeepEquals(object, { var2: "hello", var3: {} });
console.log("PASS");
} catch (e) {
console.log("FAIL: " + e);
}

View file

@ -0,0 +1,43 @@
load("test-common.js");
try {
assert(JSON.parse.length === 2);
const properties = [
["5", 5],
["null", null],
["true", true],
["false", false],
['"test"', "test"],
['[1,2,"foo"]', [1, 2, "foo"]],
['{"foo":1,"bar":"baz"}', { foo: 1, bar: "baz" }],
];
properties.forEach(testCase => {
assertDeepEquals(JSON.parse(testCase[0]), testCase[1]);
});
let syntaxErrors = [
undefined,
NaN,
-NaN,
Infinity,
-Infinity,
'{ "foo" }',
'{ foo: "bar" }',
"[1,2,3,]",
"[1,2,3, ]",
'{ "foo": "bar",}',
'{ "foo": "bar", }',
];
syntaxErrors.forEach(error => assertThrowsError(() => {
JSON.parse(error);
}, {
error: SyntaxError,
}));
console.log("PASS");
} catch (e) {
console.log("FAIL: " + e);
}

View file

@ -92,3 +92,40 @@ const assertVisitsAll = (testFunction, expectedOutput) => {
function isClose(a, b) {
return Math.abs(a - b) < 0.000001;
}
/**
* Quick and dirty deep equals method.
* @param {*} a First value
* @param {*} b Second value
*/
function assertDeepEquals(a, b) {
assert(deepEquals(a, b));
}
function deepEquals(a, b) {
if (Array.isArray(a))
return Array.isArray(b) && deepArrayEquals(a, b);
if (typeof a === "object")
return typeof b === "object" && deepObjectEquals(a, b);
return a === b;
}
function deepArrayEquals(a, b) {
if (a.length !== b.length)
return false;
for (let i = 0; i < a.length; ++i) {
if (!deepEquals(a[i], b[i]))
return false;
}
return true;
}
function deepObjectEquals(a, b) {
if (a === null)
return b === null;
for (let key of Reflect.ownKeys(a)) {
if (!deepEquals(a[key], b[key]))
return false;
}
return true;
}