希德尔提取物 number/float

Question

我想使用 Xidel 从这段代码中提取 number/float 值：

<p class="price">
    <span class="woocommerce-Price-amount amount">
        <bdi>
            304.00
            <span class="woocommerce-Price-currencySymbol">
                €
            </span>
        </bdi>
    </span>
</p>

我正在尝试以下命令：

xidel -s '<p class="price"><span class="woocommerce-Price-amount amount"><bdi>304.00 <span class="woocommerce-Price-currencySymbol">€</span></bdi></span></p>' -e "//p[@class='price']/translate(normalize-space(substring-before(., '€')),' ','')"

翻译命令应该替换 space，但它不起作用，在输出中我仍然看到数字“304.00_”后有一个 space。

Answer 1

尝试将 xpath 表达式更改为

-e  "substring-before(//p[@class='price']//bdi/normalize-space(.),' ')"

或

 -e "substring-before(//p[@class='price']//bdi/.,' ')"

或使用tokenize()

 -e "tokenize(//p[@class='price']//bdi/.,' ')[1]"

输出应该是

'304.00'

Answer 2

您将不得不使用以下查询之一单独处理 no-break space：

-e "//p[@class='price']/span/bdi/substring-before(text(),'&#160;')"
-e "//p[@class='price']/span/bdi/translate(text(),x:cps(160),'')"
-e "//p[@class='price']/span/bdi/replace(text(),'&#xA0;','')"

您不能使用 normalize-space()，因为...

https://www.w3.org/TR/xpath-functions-31/#func-normalize-space:

The definition of whitespace is unchanged in [Extensible Markup Language (XML) 1.1 Recommendation]. It is repeated here for convenience:
S ::= (#x20 | #x9 | #xD | #xA)+

...它处理空格、制表符、回车 returns 和换行，但不处理不间断空格：

xidel -s "<x>   test   </x>" -e "x'[{x}]'"
[   test   ]

xidel -s "<x>   test   </x>" -e "x'[{normalize-space(x)}]'"
[test]

xidel -s "<x>&nbsp;&nbsp;&nbsp;test&nbsp;&nbsp;&nbsp;</x>" -e "x'[{x}]'"
[   test   ]

xidel -s "<x>&nbsp;&nbsp;&nbsp;test&nbsp;&nbsp;&nbsp;</x>" -e "x'[{normalize-space(x)}]'"
[   test   ]

xidel -s "<x>&nbsp;&nbsp;&nbsp;test&nbsp;&nbsp;&nbsp;</x>" -e "x'[{translate(x,'&#160;','')}]'"
xidel -s "<x>&nbsp;&nbsp;&nbsp;test&nbsp;&nbsp;&nbsp;</x>" -e "x'[{replace(x,x:cps(160),'')}]'"
xidel -s "<x>&nbsp;&nbsp;&nbsp;test&nbsp;&nbsp;&nbsp;</x>" -e "x'[{replace(x,'&#xA0;','')}]'"
[test]

顺便说一句，在该网站上获取价格的替代方法：

xidel -s "https://kenzel.sk/produkt/bicykle/zivotny-styl/signora/" -e ^"^
  parse-json(^
    //body/script[@type='application/ld+json']^
  )//priceSpecification/price^
"
304.00

希德尔提取物 number/float

Xidel extract number/float

xpath

xidel