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Updated specification with new syntax

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nocturn9x 2021-08-20 18:13:49 +02:00
parent 66b6f4521a
commit efde97ead2
1 changed files with 7 additions and 7 deletions
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docs/grammar.md
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@ -72,11 +72,11 @@ Below you can find the EBNF specification of NimVM's grammar.
program → declaration* EOF; // An entire program (Note: an empty program is a valid program)
// Declarations (rules that bind a name to an object in the current scope and produce side effects)
declaration → structDecl | funDecl | varDecl | statement; // A program is composed by a list of declarations
structDecl → "struct" IDENTIFIER "{" (varDecl)* "}"; // Declares a structure type similar to C's
declaration → classDecl | funDecl | varDecl | statement; // A program is composed by a list of declarations
classDecl → "class" IDENTIFIER ( "<" IDENTIFIER )? "{" function* "}" ; // Declares a class
funDecl → "fun" function; // Function declarations
// Constants and immutables still count as "variable" declarations in the grammar
varDecl → "var" | "let" | "const" IDENTIFIER ( "=" expression )? ";";
varDecl → ( "var" | "let" | "const" ) IDENTIFIER ( "=" expression )? ";";
// Statements (rules that produce side effects but without binding a name)
statement → exprStmt | forStmt | ifStmt | returnStmt| whileStmt| blockStmt; // The set of all statements
@ -99,7 +99,7 @@ term → factor ( ( "-" | "+" ) factor )*; // Precedence for + and -
factor → unary ( ( "/" | "*" | "**" | "^" | "&") unary )*; // All other operators have the same precedence
unary → ( "!" | "-" | "~" ) unary | call;
call → primary ( "(" arguments? ")" | "." IDENTIFIER )*;
primary → "true" | "false" | "nil" | NUMBER | STRING | IDENTIFIER | "(" expression ")" "." IDENTIFIER;
primary → "nan" | "true" | "false" | "nil" | NUMBER | STRING | IDENTIFIER | "(" expression ")" "." IDENTIFIER;
// Utility rules to avoid repetition
function → IDENTIFIER "(" parameters? ")" blockStmt;
@ -107,8 +107,7 @@ parameters → IDENTIFIER ( "," IDENTIFIER )*;
arguments → expression ( "," expression )*;
// Lexical grammar that defines terminals in a non-recursive (regular) fashion
QUOTE → "'";
DOUBLEQUOTE → "\"";
COMMENT → "#" UNICODE* LF;
SINGLESTRING → QUOTE UNICODE* QUOTE;
DOUBLESTRING → DOUBLEQUOTE UNICODE* DOUBLEQUOTE;
SINGLEMULTI → QUOTE{3} UNICODE* QUOTE{3}; // Single quoted multi-line strings
@ -116,8 +115,9 @@ DOUBLEMULTI → DOUBLEQUOTE{3} UNICODE* DOUBLEQUOTE{3}; // Single quoted mul
NUMBER → DIGIT+ ( "." | "e" | "E" )? DIGIT+; // Numbers encompass integers and floats (even stuff like 1e5)
STRING → ("r"|"b") SINGLESTRING|DOUBLESTRING|SINGLEMULTI|DOUBLEMULTI; // Encompasses all strings
IDENTIFIER → ALPHA ( ALPHA | DIGIT )*; // Valid identifiers are only alphanumeric!
QUOTE → "'";
DOUBLEQUOTE → "\"";
ALPHA → "a" ... "z" | "A" ... "Z" | "_"; // Alphanumeric characters
UNICODE → 0x00 ... 0x10FFFD; // This covers the whole unicode range
DIGIT → "0" ... "9"; // Arabic digits
COMMENT → "#" UNICODE* LF;
```