File: syntax.bnf

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use core.io;

// This file contains pseduo-rules that are usable in some of the pre-generated parsers.
// All rules here will get a first-set of "." to give the parser logic a reasonable chance
// of detecting issues with grammars using these.

// Match a certain number of bytes. Usable in binary recursive descent parsers.
Buffer Bytes(Nat count);

// Match a certain number of codepoints. Usable in string recursive descent parsers.
Str Chars(Nat count);

// Match whitespace and return the length of the match. Assumes tab = 4 spaces unless specified.
Nat Indent();
Nat IndentTab(Nat tabWidth);

// Match whitespace of at least the specified width. Returns the new depth.
Nat MinIndent(Nat width);
Nat MinIndentTab(Nat tabWidth, Nat width);

// Match exactly the specified amount of whitespace.
void ExactIndent(Nat width);
void ExactIndentTab(Nat tabWidth, Nat width);

// For convenience: match various integer types. Usable for binary parsers.
Byte Nat8();

Nat Nat16LE();
Nat Nat16BE();
Nat Nat32LE();
Nat Nat32BE();

Int Int16LE();
Int Int16BE();
Int Int32LE();
Int Int32BE();