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https://gitlab.com/freepascal.org/fpc/source.git
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45 lines
1.6 KiB
ObjectPascal
45 lines
1.6 KiB
ObjectPascal
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type
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ttreetype = (addn,muln,subn,divn,
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modn,assignn,loadn,rangen,
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ltn,lten,gtn,gten,
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equaln,unequaln,inn,orn,
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xorn,shrn,shln,slashn,
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andn,subscriptn,derefn,addrn,
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ordconstn,typeconvn,calln,callparan,
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realconstn,fixconstn,umminusn,asmn,vecn,
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stringconstn,funcretn,selfn,
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notn,inlinen,niln,errorn,
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typen,hnewn,hdisposen,newn,
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simpledisposen,setelen,setconstrn,blockn,
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anwein,loopn,ifn,breakn,
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continuen,repeatn,whilen,forn,
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exitn,withn,casen,labeln,
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goton,simplenewn,tryexceptn,raisen,
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switchesn,tryfinallyn,isn,asn);
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{ gibt an, welche Nachfolger eines Knotens }
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ptree = ^ttree;
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ttree = record
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left,right : ptree;
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treetype : ttreetype;
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end;
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function equal_trees(t1,t2 : ptree) : boolean;
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begin
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case t1^.treetype of
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realconstn,fixconstn,umminusn,asmn,vecn,
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stringconstn,funcretn,selfn,
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equaln,
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unequaln:
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begin
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equal_trees:=(equal_trees(t1^.left,t2^.left) and
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equal_trees(t1^.right,t2^.right)) or
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(equal_trees(t1^.right,t2^.left) and
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equal_trees(t1^.left,t2^.right));
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end;
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end;
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end;
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