看看我是否误解了 numberformatter 或者我是否错误地使用它来解析和验证答案

【问题标题】：Looking to see if I misunderstand the numberformatter or whether I am using it incorrectly for parsing and validation看看我是否误解了 numberformatter 或者我是否错误地使用它来解析和验证
【发布时间】：2019-06-21 15:12:03
【问题描述】：

尝试使用 Numberformatter 解析和验证用户输入的整数（格式化程序类型 = DECIMAL）。也许它是学术性的，但我希望能够将分组分隔符更改为与语言环境中设置的约定不同。例如，在美国，分组分隔符（“千位分隔符”）默认为逗号 (',')。更改分组分隔符会产生一些意想不到的结果（请参阅下面的单元测试代码）。我不确定格式化程序是否根本不会做我想做的事或者我做错了（例如，格式化程序类型是否应该 = PATTERN_DECIMAL）。如果格式化程序类型应该是 PATTERN_DECIMAL，那么某处是否有可用的文档？ ICU 文档......嗯......没有它可能的帮助。

$this->frmtr = new \NumberFormatter('en-US', NumberFormatter::DECIMAL)         

function testGroupingSeparator() {

    $expectedResult = 12345;
    $this->assertEquals($expectedResult, $this->frmtr->parse("12,345", NumberFormatter::TYPE_INT64));

    // you can change the grouping separator character
    $newChar = '/';
    $this->frmtr->setTextAttribute(NumberFormatter::GROUPING_SEPARATOR_SYMBOL, $newChar);
    $this->assertEquals($newChar, $this->frmtr->getTextAttribute(NumberFormatter::GROUPING_SEPARATOR_SYMBOL));

    // but it appears to have no effect on parsing....the newly set grouping character is treated as 'trailing debris'
    $expectedResult = 12;
    $this->assertEquals($expectedResult, $this->frmtr->parse("12/345", NumberFormatter::TYPE_INT64));

    // semi-colon appears not to work at all as a grouping separator
    $newChar = ';';
    $this->frmtr->setTextAttribute(NumberFormatter::GROUPING_SEPARATOR_SYMBOL, $newChar);
    $this->assertFalse($this->frmtr->parse("12;345", NumberFormatter::TYPE_INT64));

    // it also impacts formatting but in a really odd and unexpected way
    $expectedResult = '12,345.';
    $this->assertEquals($expectedResult, $this->frmtr->format(12345, NumberFormatter::TYPE_INT64));

    // ok, let's set it back to 'normal'
    $this->frmtr->setTextAttribute(NumberFormatter::GROUPING_SEPARATOR_SYMBOL, ',');

    // you can change whether grouping is used
    $this->frmtr->setAttribute(NumberFormatter::GROUPING_USED, false);

    // now the parser will treat the grouping separator as trailing debris which is OK but unexpected perhaps
    $expectedResult = 12;
    $this->assertEquals($expectedResult, $this->frmtr->parse("12,345", NumberFormatter::TYPE_INT64));

    // and the formatting gets screwed up in a weird way with the grouping separator placed at the end
    $expectedResult = '12345,';
    $this->assertEquals($expectedResult, $this->frmtr->format(12345, NumberFormatter::TYPE_INT64));

}

【问题讨论】：

标签： php parsing grouping separator numberformatter

【解决方案1】：

分隔符是符号，而不是属性。请参阅Predefined constants。

使用setSymbol 而不是setTextAttribute 应该会得到预期的结果，例如：

$frmtr = new \NumberFormatter('en-US', NumberFormatter::DECIMAL);         
$frmtr->setSymbol(NumberFormatter::GROUPING_SEPARATOR_SYMBOL, '/');
print $frmtr->format("12345", NumberFormatter::TYPE_INT64) . "\n";
print $frmtr->parse("12/345", NumberFormatter::TYPE_INT64) . "\n";

输出：

12/345 
12345

【讨论】：