Dab tsi yog cov txheej txheem tsis rov ua dua kev kwv yees parsing?
Dab tsi yog cov txheej txheem tsis rov ua dua kev kwv yees parsing?

Video: Dab tsi yog cov txheej txheem tsis rov ua dua kev kwv yees parsing?

Video: Dab tsi yog cov txheej txheem tsis rov ua dua kev kwv yees parsing?
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Cov Kev kwv yees kwv yees yog ib daim ntawv tshwj xeeb ntawm recursive qhovntsej thiaj tsis mob kev txheeb xyuas , qhov twg tsis muaj backtracking yog xav tau, yog li qhov no tuaj yeem kwv yees qhov kev tsim khoom siv los hloov cov hlua nkag. Tsis yog - recursive kwv yees parsing ortable-driven tseem hu ua LL(1) parser . Qhov no parser ua raws li tus lej derivation (LMD).

Tsis tas li ntawd, dab tsi yog qhov tsis yog recursive kwv yees parsing?

Non recursive Predictive Parsing A nonrecursive twv ua ntej parser tuaj yeem ua tau los ntawm kev tswj hwm ib qho stackexplicitly, tsis yog implicitly ntawm recursive hu. Cov parser mimics ib qho kev derivation sab laug.

Ib yam li ntawd, parsing yog dab tsi thiab hom parsing? Parser yog ib tug compiler uas yog siv los rhuav cov ntaub ntawv mus rau hauv me me los ntawm lexical tsom xam theem. A parser siv tswv yim nyob rau hauv daim ntawv ntawm ib theem zuj zus ntawm tokens thiab tsim tawm nyob rau hauv daim ntawv ntawm parse tsob ntoo. Parsing isof ob hom : saum toj kev txheeb xyuas thiab hauv qab kev txheeb xyuas.

Ua raws li qhov kev pom no, qhov sib txawv ntawm sab saum toj thiab hauv qab ntawm kev txheeb xyuas yog dab tsi?

Tus yuam sij qhov sib txawv ntawm sab saum toj thiab hauv qab upparsing yog tus sab saum toj parsing ua cov kev txheeb xyuas los ntawm lub cim staring mus rau txoj hlua input whilethe hauv qab parsing ua cov kev txheeb xyuas los ntawm txoj hlua input mus rau lub cim pib.

Qhov kev kwv yees parsing table yog dab tsi?

Predictive parser yog ib tug recursive qhovntsej thiaj tsis mob parser , uas muaj peev xwm los twv seb qhov kev tsim khoom twg yuav siv los hloov cov hlua nkag. Cov kwv yeesparser tsis raug kev txom nyem los ntawm kev rov qab los. Txhawm rau ua kom tiav nws cov haujlwm, lub kwv yees parser siv tus taw tes saib ua ntej, uas taw qhia rau cov cim nkag tom ntej.

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