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util: implement %o as formatting specifier #14558

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2dc1ba6
util: implement %o as formatting specifier
gla5001 Jul 31, 2017
c0826e7
util: implement %o as formatting specifier
gla5001 Aug 1, 2017
0b373b4
util: implement %o as formatting specifier.
gla5001 Aug 1, 2017
436765e
util: implement %o as formatting specifier. doc fix
gla5001 Aug 1, 2017
6bffe78
util: implement %o as formatting specifier
gla5001 Aug 2, 2017
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util: implement %o as formatting specifier. 
Nit fix and changing behavior of %o
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@gla5001
gla5001 committed Aug 1, 2017
commit 0b373b4d0f96cd348af9f1aec929c07eeedb1744
8 changes: 5 additions & 3 deletions doc/api/util.md
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Expand Up @@ -167,9 +167,11 @@ corresponding argument. Supported placeholders are:
* `%f` - Floating point value.
* `%j` - JSON. Replaced with the string `'[Circular]'` if the argument
contains circular references.
* `%o` - Object. A string representation of an object.
Similar to `util.inspect()` without options.
* `%O` - Object. Same as `%o`.
* `%o` - Object. A string representation of an object
with optimally useful formatting.
* `%O` - Object. A string representation of an object
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@vsemozhetbyt vsemozhetbyt Aug 1, 2017

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It seems we should state explicitly that JSON stringification is involved here with its restrictions.

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@gla5001 gla5001 Aug 1, 2017

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@vsemozhetbyt Hows that look?

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@vsemozhetbyt vsemozhetbyt Aug 1, 2017

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It seems explicit enough if we do have a consensus for this behavior.

with generic JavaScript object formatting.
Similar to `util.inspect()` without options.
* `%%` - single percent sign (`'%'`). This does not consume an argument.

If the placeholder does not have a corresponding argument, the placeholder is
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6 changes: 5 additions & 1 deletion lib/util.js
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Expand Up @@ -138,11 +138,15 @@ function format(f) {
str += String(arguments[a++]);
break;
case 79: // 'O'
case 111: // 'o'
if (lastPos < i)
str += f.slice(lastPos, i);
str += inspect(arguments[a++]);
break;
case 111: // 'o'
if (lastPos < i)
str += f.slice(lastPos, i);
str += tryStringify(arguments[a++], null, ' ');
break;
case 37: // '%'
if (lastPos < i)
str += f.slice(lastPos, i);
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11 changes: 5 additions & 6 deletions test/parallel/test-util-format.js
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Expand Up @@ -116,20 +116,19 @@ const nestedObj = {
};
assert.strictEqual(util.format('%o'), '%o');
assert.strictEqual(util.format('%o', 42), '42');
assert.strictEqual(util.format('%o', 'foo'), '\'foo\'');
assert.strictEqual(util.format('%o', 'foo'), '"foo"');
assert.strictEqual(
util.format('%o', obj),
'{ foo: \'bar\', foobar: 1, func: [Function: func] }');
'{"foo":"bar","foobar":1}');
assert.strictEqual(
util.format('%o', nestedObj),
'{ foo: \'bar\', foobar: { foo: \'bar\', func: [Function: func] } }');
'{"foo":"bar","foobar":{"foo":"bar"}}');
assert.strictEqual(
util.format('%o %o', obj, obj),
'{ foo: \'bar\', foobar: 1, func: [Function: func] } ' +
'{ foo: \'bar\', foobar: 1, func: [Function: func] }');
'{"foo":"bar","foobar":1} {"foo":"bar","foobar":1}');
assert.strictEqual(
util.format('%o %o', obj),
'{ foo: \'bar\', foobar: 1, func: [Function: func] } %o');
'{"foo":"bar","foobar":1} %o');

assert.strictEqual(util.format('%O'), '%O');
assert.strictEqual(util.format('%O', 42), '42');
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