The grammar corresponds to the latest stable version of the Kotlin compiler excluding lexer and parser rules for experimental features that are disabled by default. new line tokens are excluded (new lines are not allowed in some places, see source grammar files for details).lexer rules consisting of one string literal element are inlined to the use site,.helper attribute denotes a lexer fragment rule (used only inside other terminal symbols).Īlso for better readability some simplifications are made:.start attribute denotes a symbol that represents the whole source file (see kotlinFile and script),.Symbol definitions may be documented with attributes: Non-terminal symbol names start with a lowercase letter, e.g. Terminal symbol names start with an uppercase letter, e.g. The grammar on this page corresponds to the grammar files above. UnicodeClasses.g4 describes the characters that can be used in identifiers (these rules are omitted on this page for better readability).KotlinLexer.g4 describes lexical structure.Kotlin grammar source files (in ANTLR format) are located in the Kotlin specification repository: operator ? denotes option (zero or one),.Currently, tail recursion is supported by Kotlin for the JVM and Kotlin/Native. You cannot use tail recursion when there is more code after the recursive call, within try/catch/finally blocks, or on open functions. operator + denotes iteration (one or more), To be eligible for the tailrec modifier, a function must call itself as the last operation it performs.operator * denotes iteration (zero or more),.omitted lexer rule actions and commands,.The notation used on this page corresponds to the ANTLR 4 notation with a few exceptions for better readability:
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