The way in which the terminals and non-terminal combine to form strings is specified by the productions of a grammar. Terminals are the basic symbols from which strings are formed. A set of tokens, known as terminal symbols (Σ).The set of strings are defined by the non-terminals, which help in defining the grammar language. The syntactic variables that denote the set of strings are Non-terminals. What is Context-Free Grammar (CFG)?Ī context-free grammar has four components: The syntax of the programming languages is described by the CFG. Thus the context-free grammar (CFG), which is recognized by push-down automata, is used by this phase.ĬFG, on the other hand, is a superset of Regular Grammar, as depicted below:Įach Regular Grammar is context-free, but some problems exists that are beyond the scope of Regular Grammar. The balancing tokens cannot be checked by regular expressions. But the syntax of the given statement cannot be checked by the lexical analyzer because of the limitations of the regular expressions. It is observed in the previous chapters that the tokens are identified by the lexical analyser. The second phase of the compiler is known as Syntax analysis. What is Syntax Analysis in Compiler Design?
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