openatx/uiautomator2

lxml.etree._tagValidOrRaise() 提示 Invalid tag name 导致无法获取界面内容

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#670 opened on Apr 8, 2021

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 (0 comments) (0 reactions) (0 assignees)Python (5,632 stars) (1,353 forks)batch import
help wanted

Description

版本信息

Name: uiautomator2 Version: 2.14.1

问题描述

d.xpath("//*[re:match(@text, '^.*')]").all()提取支付宝首页文本时, 出现异常报错

---------------------------------------------------------------------------
ValueError                                Traceback (most recent call last)
<ipython-input-18-bbe349559290> in <module>
----> 1 d.xpath("//*[re:match(@text, '^.*')]").all()

c:\users\w\anaconda3\lib\site-packages\uiautomator2\xpath.py in all(self, source)
    473 
    474         for node in root.xpath("//node"):
--> 475             node.tag = safe_xmlstr(node.attrib.pop("class", "")) or "node"
    476 
    477         match_sets = []

src/lxml/etree.pyx in lxml.etree._Element.tag.__set__()

src/lxml/apihelpers.pxi in lxml.etree._tagValidOrRaise()

ValueError: Invalid tag name '  '

通过d.dump_hierarchy()获取xml, 发现确实有个class为" "的node项

<node index="0" text="" resource-id="" class="  " package="com.eg.android.AlipayGphone" content-desc="财富生活" checkable="false" checked="false" clickable="false" enabled="true" focusable="true" focused="false" scrollable="false" long-clickable="false" password="false" selected="false" visible-to-user="true" bounds="[36,1556][1044,1676]">

用ATX WEditor找到对应项 image

Contributor guide

Tech stack
pythonandroid
Domain
mobiletesting
Issue type
bug
DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.
2
Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.
under 1 hour
Activity statusHow available the issue appears right now: fresh, active, stale, blocked, or waiting on maintainer input.
stale
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
clear
Prerequisites
Pythonlxml basics
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
85
Research direction
The bug occurs in uiautomator2/xpath.py at line 475 where the class attribute is used as the XML tag without sanitization. When the class attribute consists only of whitespace, it causes an Invalid tag name error. The fix should either strip whitespace from the class value before setting as tag or fallback to 'node' when the resulting tag is invalid. Consider modifying the safe xmlstr function or the assignment logic.