I know HTML is experimental in Semgrep, but I expect it to work on very simple matches (Bash is experimental too, and it works well enough already).
How can I match any two elements with the same ID?
<!-- this should match since both have same IDs -->
<div id="a"></div>
<div id="a"></div>
<!-- this should match since both have same IDs, even though spacing is different (valid HTML) -->
<div id="b"></div>
<div id = "b"></div>
<!-- this should match since both have same IDs, even though different tags -->
<div id="c"></div>
<div>Something in between should still work</div>
<span id="c"></div>
<!-- self-closing tags should match too -->
<link id="d" rel="stylesheet" href="styles.css">
<span id="d"></span>
Attempt
rules:
- id: dupe_id
message: duplicate IDs not allowed
languages:
- html
severity: ERROR
patterns:
- pattern-either:
# Both not self-closing
- pattern: <$TAGA id="$X"></$TAGA><$TAGB id="$X"></$TAGB>
# First self-closing
- pattern: <$TAGA id="$X"><$TAGB id="$X"></$TAGB>
# Second self-closing
- pattern: <$TAGB id="$X"></$TAGB><$TAGA id="$X">
Error
Attempt gives only one match, but expected 4. Why does this happen?
Other patterns
- Just
<$TAGA id="$X"></$TAGA>matches any tag with ID as expected <$TAGA id="$X"></$TAGA><$TAGB id="$X"></$TAGB>matches nothing (unexpected, should match anything with two consecutive same IDs)- Even if
...is used between
- Even if
