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plurals

PO
primarykey
Id
3538793
data
AcceptedAnswerId
0
AnswerCount
0
ClosedDate
CommentCount
0
CommunityOwnedDate
2010-08-21T20:16:32.320
CreationDate
2010-08-21T20:16:32.320
FavoriteCount
0
LastActivityDate
2010-08-21T20:58:30.297
LastEditDate
2010-08-21T20:58:30.297
LastEditorUserId
371793
OwnerUserId
371793
ParentId
3523323
PostTypeId
2
Score
7
ViewCount
0
LastEditorDisplayName
text
Body
<h2>C (parsing+matching) <strike>727</strike> 670 chars</h2> <p>This is not fully golfed to the bare minimum yet, but I wanted to try and see if parsing the regexp first would make a difference to interpreting it live. It does, because it costs more, although both parsing and matching are easier to write/understand.</p> <pre><code>#define Q struct q #define C char #define R return Q{Q*u,*n,*a;C c,m};Q*P(C*p,C*e){Q*r=calloc(99,1);C*n=p+1,c=1,w;if(p==e)R r;if(*p==40){for(;c;)c+=(*n==40)-(*n++==41);r->u=P(p+1,n-1);}else if(*p=='|'){r->a=P(p+1,e);R r;}else r->c=*p;if(n<e){if(*n==43)*n=42,r->n=P(p,e);else w=*n==42|*n==63,r->n=P(n+w,e),r->m=w?*n:0;r->a=r->n->a;}R r;}M(Q*r,C*s,C*o,C*z){C*p, e;e=r?r->m==63|r->m==42&&M(r->n,s,o,z)?:*s&&r->c==*s?M(r->m==42?r:r->n,s+1,o,z):2:s ==z;if(e-2)R e;for(p=s,e=0;!r->c&p<=z;p++)e|=M(r->u,s,s,p)&(r->m!=42|p>s)&&M(r->m== 42?r:r->n,p,p,z);R e||r->a&&M(r->a,o,o,z);}main(C c,C**v){for(;--c>1;)puts(M(P(v[1],index(v[1],0)),v[c],v[c],index(v[c],0))?"true":"false");} </code></pre> <p>it parses a regexp into a struct, where each struct has:</p> <ul> <li>the character to be matched <em>or</em> a pointer to a struct of a subpattern to be matched</li> <li>a pointer to the next symbol struct (if any)</li> <li>a pointer to the next alternative pattern (if any)</li> <li>a multiplier which is \0, <code>*</code> or <code>?</code> -- <code>(pat)+</code> is parsed into <code>(pat)(pat)*</code> right away which makes matching far easier</li> </ul>
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1. POCode Golf: Regex parser
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1. USmvds
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1. USmvds
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2. VO
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