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Strip block comments: Difference between revisions

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Strip block comments (view source)

Revision as of 12:07, 10 April 2022

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=={{header|Phix}}==
Note that Phix itself supports nested block comments, which this simple approach will not handle properly - see ptok.e/SkipBlockComment() and/or pwa/src/p2js_tok.e/block_comment(), which both use a slightly more convoluted and recursive but also more precise character-by-character method.
<lang Phix>constant test = """
<!--<lang Phix>(phixonline)-->
/**▼
<span style="color: #008080;">with</span> <span style="color: #008080;">javascript_semantics</span>
* Some comments▼
<span style="color: #008080;">constant</span> <span style="color: #000000;">test</span> <span style="color: #0000FF;">=</span> <span style="color: #008000;">"""
* longer comments here that we can parse.▼
*▼
* Rahoo ▼
*/▼
function subroutine() {▼
a = /* inline comment */ b + c ;▼
}▼
/*/ <-- tricky comments */
 
/**
* AnotherSome comment.comments
▲ * longer comments here that we can parse.
▲ *
▲ * Rahoo
*/
function somethingsubroutine() {
▲ a = /* inline comment */ b + c ;
}
▲ /*/ Some&lt;-- tricky comments */
"""
 
▲ /**
function strip_comments(string text, startc="/*", endc="*/")
while 1* doAnother comment.
▲ */
integer startp = match(startc,text)
▲ function subroutinesomething() {
if startp=0 then exit end if
▲ }
integer endp = match(endc,text,startp+length(startc))
"""</span>
if endp=0 then
puts(1,"error, aborting...")
<span style="color: #008080;">function</span> <span style="color: #000000;">strip_comments</span><span style="color: #0000FF;">(</span><span style="color: #004080;">string</span> <span style="color: #000000;">text</span><span style="color: #0000FF;">,</span> <span style="color: #000000;">startc</span><span style="color: #0000FF;">=</span><span style="color: #008000;">"/*"</span><span style="color: #0000FF;">,</span> <span style="color: #000000;">endc</span><span style="color: #0000FF;">=</span><span style="color: #008000;">"*/"</span><span style="color: #0000FF;">)</span>
abort(0)
<span style="color: #008080;">while</span> <span style="color: #004600;">true</span> <span style="color: #008080;">do</span>
end if
<span style="color: #004080;">integer</span> <span style="color: #000000;">startp</span> <span style="color: #0000FF;">=</span> <span style="color: #7060A8;">match</span><span style="color: #0000FF;">(</span><span style="color: #000000;">startc</span><span style="color: #0000FF;">,</span><span style="color: #000000;">text</span><span style="color: #0000FF;">),</span> <span style="color: #000000;">endp</span>
text[startp..endp+length(endc)-1] = ""
<span style="color: #008080;">if</span> <span style="color: #000000;">startp</span><span style="color: #0000FF;">=</span><span style="color: #000000;">0</span> <span style="color: #008080;">then</span> <span style="color: #008080;">exit</span> <span style="color: #008080;">end</span> <span style="color: #008080;">if</span>
end while
<span style="color: #000000;">endp</span> <span style="color: #0000FF;">=</span> <span style="color: #7060A8;">match</span><span style="color: #0000FF;">(</span><span style="color: #000000;">endc</span><span style="color: #0000FF;">,</span><span style="color: #000000;">text</span><span style="color: #0000FF;">,</span><span style="color: #000000;">startp</span><span style="color: #0000FF;">+</span><span style="color: #7060A8;">length</span><span style="color: #0000FF;">(</span><span style="color: #000000;">startc</span><span style="color: #0000FF;">))</span>
return text
<span style="color: #7060A8;">assert</span><span style="color: #0000FF;">(</span><span style="color: #000000;">endp</span><span style="color: #0000FF;">!=</span><span style="color: #000000;">0</span><span style="color: #0000FF;">,</span><span style="color: #008000;">"error"</span><span style="color: #0000FF;">)</span>
end function
<span style="color: #000000;">text</span><span style="color: #0000FF;">[</span><span style="color: #000000;">startp</span><span style="color: #0000FF;">..</span><span style="color: #000000;">endp</span><span style="color: #0000FF;">+</span><span style="color: #7060A8;">length</span><span style="color: #0000FF;">(</span><span style="color: #000000;">endc</span><span style="color: #0000FF;">)-</span><span style="color: #000000;">1</span><span style="color: #0000FF;">]</span> <span style="color: #0000FF;">=</span> <span style="color: #008000;">""</span>
 
<span style="color: #008080;">end</span> <span style="color: #008080;">while</span>
puts(1,strip_comments(test))</lang>
<span style="color: #008080;">return</span> <span style="color: #000000;">text</span>
<span style="color: #008080;">end</span> <span style="color: #008080;">function</span>
<span style="color: #7060A8;">puts</span><span style="color: #0000FF;">(</span><span style="color: #000000;">1</span><span style="color: #0000FF;">,</span><span style="color: #000000;">strip_comments</span><span style="color: #0000FF;">(</span><span style="color: #000000;">test</span><span style="color: #0000FF;">))</span>
<!--</lang>-->
{{out}}
<pre>
Petelomax
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