Removing Left Recursion & Left Factoring from Grammar | Compiler Design | Ambiguity Removal
In this video, we explore Left Recursion and Left Factoring in Grammar and demonstrate step-by-step techniques to eliminate them to make the grammar suitable for parsing. Removing left recursion and left factoring is essential for eliminating ambiguity and making the grammar usable for LL and LR parsers in Compiler Design.
🔹 What You’ll Learn:
✅ Understanding Left Recursion in Grammar
🔸 What is Left Recursion, and why does it cause issues in Top-Down Parsing?
🔸 Types of Left Recursion – Immediate & Indirect Left Recursion.
🔸 How LL Parsers fail due to Left Recursion.
✅ Eliminating Left Recursion (Step-by-Step Process)
🔸 General Formula for removing Left Recursion:
🔸 Example Walkthrough – Removing Left Recursion from:
E → E + T | T ✅ Understanding Left Factoring in Grammar
🔸 What is Left Factoring, and why is it necessary?
🔸 How Removing Left Factoring makes a grammar suitable for Predictive Parsing.
✅ Eliminating Left Factoring (Step-by-Step Process)
🔸 General Formula for Left Factoring:
🔸 Example Walkthrough – Removing Left Factoring from:
S → if E then S else S | if E then S ✅ Final Conclusion:
🔸 Why removing Left Recursion and Left Factoring is crucial for LL(1) and LR Parsers.
🔸 Encouragement to watch upcoming videos on Predictive Parsing & Parsing Table Construction.
📌 This video is perfect for students learning Compiler Design, Parsing Techniques, and Context-Free Grammar.
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