Discussion
LR parsers read their input from ............. to ............. and produce a .............. derivation.
Answer: A
LR parsers read their input from Left, Right, Rightmost: left to right, producing a rightmost derivation.
In LR, the L means the input is scanned from left to right and the R means a rightmost derivation is constructed, in reverse. The parser works bottom-up, shifting tokens and reducing handles, and the sequence of reductions is a rightmost derivation traced backwards.
A leftmost derivation from a left-to-right scan describes LL (top-down) parsers. No standard parser reads its input from right to left.
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