Video: Dab tsi yog parsing hauv C ++?
2024 Tus sau: Lynn Donovan | [email protected]. Kawg hloov kho: 2023-12-15 23:47
Nyob rau hauv nruab nrab ntawm lexical tsom xam thiab syntax tsom xam muaj lwm theem uas yog hu ua kev txheeb xyuas . Parsing . Yog li ntawd, kev txheeb xyuas yog tus txheej txheem ntawm kev tshuaj xyuas cov ntawv nyeem uas contianssequence ntawm tokens los txiav txim cov qauv grammatical w.r.tgiven grammar. Lub hom phiaj tseem ceeb ntawm parser yog: Performconetext dawb syntax tsom xam
Cov lus nug tseem yog, dab tsi yog parsing hauv C ++?
Parse . Lo lus " parse " txhais tau hais tias los txheeb xyuas cov khoom tshwj xeeb. Nws yog feem ntau siv hauv computer science torefer rau kev nyeem cov lej program. Piv txwv li, tom qab qhov program raug sau, txawm tias nws yog hauv C ++, Java, lossis lwm yam lus, tus lej yuav tsum yog pared los ntawm lub compiler nyob rau hauv thiaj li yuav becompiled.
Ib tug kuj yuav nug, dab tsi yog parsing hauv software? A parser yog ib qho compiler lossis tus neeg txhais lus cov ntsiab lus uas rhuav cov ntaub ntawv rau hauv cov ntsiab lus me me kom yooj yim txhais ua lwm yam lus. A parser siv cov tswv yim nyob rau hauv daim ntawv ntawm asequence ntawm tokens los yog cov lus qhia kev pab cuam thiab feem ntau tsim adata qauv nyob rau hauv daim ntawv ntawm ib tug parse tsob ntoo los yog tsob ntoo abstractsyntax.
Tsuas yog li ntawd, parsing code txhais li cas?
Parsing , syntax analysis, los yog syntactic analysis yog cov txheej txheem ntawm kev tshuaj xyuas ib txoj hlua ntawm cov cim, xws li nyob rau hauv natural language, computer languages los yog cov ntaub ntawv qauv, ua raws li cov cai ntawm cov qauv sau ntawv. Lub sij hawm kev txheeb xyuas los ntawm Latinpars (orationis), lub ntsiab lus ib feem (ntawm kev hais lus).
Dab tsi yog parsing thiab nws hom?
Compiler Tsim - Hom ntawm Parsing . Kev tshaj tawm. Syntax analyzers ua raws li cov cai ntau lawm uas txhais los ntawm cov ntsiab lus tsis muaj cov qauv sau ntawv. Txoj kev cov cai ntau lawm yog siv (derivation) faib kev txheeb xyuas ua ob hom : saum-down kev txheeb xyuas thiab hauv qab kev txheeb xyuas.