3 Consider the following EBNF grammar (extracted from the Pascal ISO 7185 grammar) for VA (VarAccess) VA CV Id CV IV FD AV VA RV VA This grammar is indirectly left recursive a) Show how this grammar may be transformed into one involving a single rule of the form VA Id Selector b) Give the rule for Selector using EBNF c) Describe VA using a single syntax graph d) Write a recursive descent parser (in pseudocode or C) for VA Assume the existence of procedures NextSym and Match 3 Consider the following EBNF grammar (extracted from the Pascal ISO 7185 grammar) for VA (VarAccess) VA CV Id CV IV FD AV VA RV VA This grammar is indirectly left recursive a) Show how this grammar may be transformed into one involving a single rule of the form VA Id Selector b) Give the rule for Selector using EBNF c) Describe VA using a single syntax graph d) Write a recursive descent parser (in pseudocode or C) for VA Assume the existence of procedures NextSym and Match

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3  Consider the following EBNF grammar (extracted from the Pascal ISO 7185 grammar) for VA (VarAccess)  VA   CV   Id CV  IV  FD AV   VA RV  VA This grammar is indirectly left recursive a) Show how this grammar may be transformed into one involving a single rule of the form  VA   Id Selector b) Give the rule for Selector using EBNF c) Describe VA using a single syntax graph  d) Write a recursive descent parser (in pseudocode or C) for VA  Assume the existence of procedures NextSym and Match 3  Consider the following EBNF grammar (extracted from the Pascal ISO 7185 grammar) for VA (VarAccess)  VA   CV   Id CV  IV  FD AV   VA RV  VA This grammar is indirectly left recursive a) Show how this grammar may be transformed into one involving a single rule of the form  VA   Id Selector b) Give the rule for Selector using EBNF c) Describe VA using a single syntax graph  d) Write a recursive descent parser (in pseudocode or C) for VA  Assume the existence of procedures NextSym and Match

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3. Consider the following EBNF grammar (extracted from the Pascal-ISO-7185 grammar) for VA (VarAccess). VA - CV | Id CV -IV| FD AV - VA

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