Member Avatar for Genuis Man

i need simple example to make bnf for c# language?

  • 3 Contributors
  • 3 Replies
  • 79 Views
  • 1 Day Discussion Span
  • Latest Post Latest Post by Genuis Man

Dani AI

Generated

— building a C# -> ISA compiler is a good project, but start small. Pick a clear subset that covers declarations, assignments, conditionals and loops, and method calls. Note: C# has no built-in input/output statements; I/O is done with API calls (for example, Console.ReadLine/WriteLine), so treat method-invocation syntax as part of your statement/expression grammar rather than as separate language constructs.

A practical workflow: write a lexer that emits tokens for your subset; express the subset in EBNF and convert it to BNF for table construction; choose a parsing strategy (LL(1) if you restrict the grammar, or LR-family / parser generator for more features); compute FIRST/FOLLOW sets and build the parse table (or let a generator produce LR tables). After parsing, build an AST, implement a symbol table and type-checker, then lower AST nodes to your target ISA. If you plan to handle full C# later, use an existing parser rather than hand-rolling everything.

Watch out for common pitfalls: declaration-vs-expression ambiguity (type name vs identifier), var type inference, generics and angle-bracket tokenization, and contextual keywords — these require semantic context, not just CFG rules. For authoritative grammar and tooling see the official C# Language Specification, the Roslyn parser source (dotnet/roslyn), or the ANTLR C# grammar as a starting point (grammars-v4/csharp). is correct that the full BNF is large; that is why a focused subset or existing parser is the pragmatic first step.

Recommended Answers

All 3 Replies

Member Avatar for JerryShaw

What is bnf ?

Member Avatar for barrydallenbach

Backus–Naur form, used to define the syntax of the language(my def).

I would not find it usefull for C#, but often helps with SQL and XML formats.

Why do you need the BNF of c#, just wondering?

Member Avatar for Genuis Man

i will make isa compiler for c#
i need to know bnf of input and output statement and assignment and declartion of variable and looping and branching to make parse table for it .......

Be a part of the DaniWeb community

We're a friendly, industry-focused community of developers, IT pros, digital marketers, and technology enthusiasts meeting, networking, learning, and sharing knowledge.