38 lines
1.4 KiB
Plaintext
38 lines
1.4 KiB
Plaintext
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program -> declaration* EOF;
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declaration -> proc_decl |
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var_decl |
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statement;
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proc_decl -> "proc" IDENTIFIER block;
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var_decl -> "var" IDENTIFIER ("=" expression)? ";";
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statement -> expression_statement |
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for_statement |
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if_statement |
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block;
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expression_statement -> expression ";";
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for_statement -> "for" "(" (var_decl|expression_statement|";")
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expression? ";" expression? ")" statement;
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if_statement -> "if" "(" expression ")" statement
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("else" statement)?;
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block -> "{" declaration* "}";
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expression -> assignment;
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assignment -> (call ".")? IDENTIFIER "=" assignment |
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logic_or;
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logic_or -> logic_and ("or" logic_and)*;
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logic_and -> equality ("and" equality)*;
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equality -> comparison (("!=" | "==") comparison)*;
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comparison -> term ((">" | ">=" < "<" | "<=") term)*;
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term -> factor (("-" | "+") factor)*;
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factor -> unary (("/" | "*") unary)*;
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unary -> ("!" | "-") unary | call;
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call -> primary "(" arguments? ")";
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primary -> "true" | "false" | NUMBER | STRING |
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IDENTIFIER | "(" expression ")";
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