The left corner of a production rule in a context-free grammar is the left-most symbol on the right side of the rule.
For example, in the rule A→Xα, X is the left corner.
The left corner table associates a symbol with all possible left corners for that symbol, and the left corners of those symbols, etc.
Given the grammar
- S→VP
- S→NP VP
- VP→V NP
- NP→DET N
| Symbol | Left corner(s) |
|---|---|
| S | VP, NP, V, DET |
| NP | Det |
| VP | V |
Left corners are used to add bottom-up filtering of a top-down parser.
You can use the left corners to do top-down filtering of a bottom-up parser.
Famous quotes containing the words left and/or corner:
“He is to the great poet, what an excellent mimic is to a great actor. There is no determinate impression left on the mind by reading his poetry.... A great mind is one that moulds the minds of others.”
—William Hazlitt (1778–1830)
“I feel all dead inside. I’m backed up in a dark corner and I don’t know who’s hitting me!”
—Jay Dratler, U.S. screenwriter, Bernard Schoenfeld, and Henry Hathaway. Bradford Galt (Mark Stevens)