(Lec-26) CLR(1) Parsing | কম্পাইলার ডিজাইন বাংলা টিউটোরিয়াল

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CLR (1) Parsing
CLR refers to canonical lookahead. CLR parsing use the canonical collection of LR (1) items to build the CLR (1) parsing table. CLR (1) parsing table produces the more number of states as compare to the SLR (1) parsing.

In the CLR (1), we place the reduce node only in the lookahead symbols.

Various steps involved in the CLR (1) Parsing:

For the given input string write a context free grammar
Check the ambiguity of the grammar
Add Augment production in the given grammar
Create Canonical collection of LR (0) items
Draw a data flow diagram (DFA)
Construct a CLR (1) parsing table

LR (1) item

LR (1) item is a collection of LR (0) items and a look ahead symbol.

LR (1) item = LR (0) item + look ahead

The look ahead is used to determine that where we place the final item.

The look ahead always add $ symbol for the argument production