#CONTEXT FREE GRAMMAR PANIC MODE HOW TO#
#CONTEXT FREE GRAMMAR PANIC MODE MANUAL#
#CONTEXT FREE GRAMMAR PANIC MODE CODE#

#CONTEXT FREE GRAMMAR PANIC MODE CODE#

Then, before executing the code or compiling it into the executable, it transforms the AST through semantic analysis. The compiler parses Nim source code into an internal data structure called the abstract syntax tree ( AST). We use the term runtime to cover both compile-time execution and code execution in the executable. Most of the Nim language is supported at compile-time, but there are some restrictions - see Restrictions on Compile-Time Execution for details. This can include constant expressions, macro definitions, and Nim procedures used by macro definitions. However, some of the code may be executed at compile-time. In a typical Nim program, most of the code is compiled into the executable. The nature of this executable depends on the compiler implementation it may, for example, be a native binary or JavaScript source code. It is processed by a Nim compiler into an executable. An l-value can denote either a location or the value the location contains, depending on the context.Ī Nim program consists of one or more text source files containing Nim code. Expressions that produce locations are called l-values. The meaning of an identifier is determined by the smallest enclosing scope in which the identifier is declared unless overloading resolution rules suggest otherwise.Īn expression specifies a computation that produces a value or location. The region of the program over which a declaration applies is called the scope of the declaration. If the static type is not the same as the dynamic type, it is a super-type or subtype of the dynamic type.Īn identifier is a symbol declared as a name for a variable, type, procedure, etc. The variable's type is called static type, the location's type is called dynamic type.

Each variable and location is of a certain type. A variable is basically a name for a location. Nim code specifies a computation that acts on a memory consisting of components called locations. Other parts of Nim, like scoping rules or runtime semantics, are described informally.

The binary ^* operator is used as a shorthand for 0 or more occurrences separated by its second argument likewise ^+ means 1 or more occurrences: a ^+ b is short for a ( b a ) * and a ^* b is short for ( a ( b a ) * ) ?. An example: ifStmt = 'if' expr ':' stmts ('elif' expr ':' stmts)* ('else' stmts)? Verbatim terminal symbols (including keywords) are quoted with '. Non-terminals start with a lowercase letter, abstract terminal symbols are in UPPERCASE. is often used to ensure the grammar is not ambiguous. is the ordered choice that requires the parser to try the alternatives in the given order. The |, / symbols are used to mark alternatives and have the lowest precedence. It will be consumed in the following rule. & is the lookahead operator & a means that an a is expected but not consumed. Parentheses may be used to group elements. The language constructs are explained using an extended BNF, in which ( a ) * means 0 or more a's, a + means 1 or more a's, and ( a ) ? means an optional a.

#CONTEXT FREE GRAMMAR PANIC MODE HOW TO#

To learn how to compile Nim programs and generate documentation see the Compiler User Guide and the DocGen Tools Guide. This document describes the lexis, the syntax, and the semantics of the Nim language. Note: Assignments, moves, and destruction are specified in the destructors document. Note: The experimental features of Nim are covered here.

#CONTEXT FREE GRAMMAR PANIC MODE MANUAL#

This manual is constantly evolving into a proper specification. Note: This document is a draft! Several of Nim's features may need more precise wording. 'Complexity' seems to be a lot like 'energy': you can transfer it from the end-user to one/some of the other players, but the total amount seems to remain pretty much constant for a given task.

Inhibit dynamic method resolution via procCall.

Context free grammar panic mode