Mastering Left Recursion Elimination in Compiler Design for LL(1) Parsing ⚙️

Elimination of Left Recursion|Compiler Design | CFG | LL(1) Parse


Left Recursion(LR):
A Production of form-
𝐴 → 𝐴𝛼 /𝛽 is called as left recursion. Hence eliminate left recursion, by
adding production rules, such that
𝐴 → 𝛽𝐴'
𝐴' → 𝛼𝐴' /∈

General rule: 𝐴 → 𝐴𝛼1 /𝐴𝛼2 /𝐴𝛼3 / …/ 𝛽1 / 𝛽2 /𝛽3 …
Hence eliminate left recursion, by adding production rules, such that
𝐴 → 𝛽1𝐴 ′/ 𝛽2 𝐴 ′/𝛽3𝐴 ′ …
𝐴 ′ → 𝛼1𝐴 ' /𝛼2𝐴 ′ /𝛼3 𝐴 ′ … / €

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