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-= The programming language Elna
-:toc:
-
-== Introduction
-
-Elna is a simple, imperative, low-level programming language.
-
-It is intendet to accompany other languages in the areas, where a high-level
-language doesn't fit well. It is also supposed to be an intermediate
-representation for a such high-level hypothetical programming language.
-
-== Expressions
-
-The expression `@r.field` includes 3 expressions:
-
-1. Variable expression `r`.
-2. Field access `(r).field`.
-3. Address taking `@(r.field)`.
-
-The expression is evaluated in the above order. The postfix expressions
-like field access have higher precedence than prefix operators.
-
-=== Binary expressions
-
-.Operator precedence
-|===
-|Precedence |Operator |Description
-
-|1 |* / % |Multiplication, division and remainder.
-|2 |+ - |Addition and subtraction.
-|3 |<< >> |Left and right shifts.
-|4 |= <> > < <= >=| Relational operators.
-|5 |or xor &| Logical operators.
-|===
-
-=== Unary expressions
-
-Unary expressions are expressions with a prefix operator followed by one
-operand.
-
-`@` (*at sign*) takes the address of its operand. The operand expression should be
-addressable.
-
-`-` (*minus*) negates a numeric value.
-
-`~` (*tilde*) applied on a boolean acts as logical not. Applied on a numeric – as
-bitwise not.
-
-== Conditional statements
-
-== Loop statements
-
-== Type system
-
-```
-type = array-type | pointer-type | record-type | enumeration-type
-    | procedure-type | identifier.
-```
-
-=== Primitive types
-
-* Pointer
-* Word
-* Int
-* Bool
-* String
-* Char
-
-=== Pointer types
-
-```
-pointer-type = "^" type.
-```
-
-Example:
-```
-program;
-var
-  x: Int;
-  y: ^Int;
-begin
-  y := @x;
-  y^ := 0
-end.
-```
-
-=== Static array
-
-```
-array-type = "[" expression "]" type.
-```
-
-Example:
-```
-program;
-var
-  array: [3]Int := [1, 2, 3];
-begin
-  array[1] := array[2]
-end.
-```
-
-=== Procedure types
-
-```
-procedure-heading = "proc" identifier-definition
-    "(" [field {"," field}] ")" return-declaration.
-block = constant-part variable-part statement-part "end".
-procedure-declaration = procedure-heading ";" (block | "extern").
-return-declaration = ["->" "!" | "->" type].
-procedure-type = "proc" "(" [types] ")" return-declaration.
-```
-
-Example:
-```
-program;
-var
-  a: proc(Int) -> Int;
-
-proc f(x: Int) -> Int;
-end;
-
-begin
-  a := f;
-  a(0)
-end.
-```
-
-=== Records
-
-```
-field = identifier ":" type.
-record-type = "record" ["(" identifier ")"] [field {";" field}] "end".
-```
-
-Example:
-```
-program;
-type
-  T = record
-    x: Int
-  end;
-  U = record(T)
-    y: Int;
-    z: Int
-  end;
-
-var
-  u: U;
-begin
-  u := U(0, 1, 2);
-  u.x := 3
-end.
-```
-
-=== Enumerations
-
-```
-enumeration-type = "(" identifier {"," identifier} ")".
-```
-
-Example:
-```
-program;
-type
-  E = (one, two, three);
-var
-  e: E;
-begin
-  e := E.one
-end.
-```
-
-=== Type operations
-
-=== Cast
-
-```
-cast = "cast" "(" expression ":" type ")".
-```
-
-The type of an object can be reinterpreted with a cast expression:
-`cast(object: Type)`.
-
-=== Traits
-
-```
-trait-identifier = "#" identifier.
-trait = trait-identifier "(" [types] ")".
-```
-
-Traits allow to query some information about the types, like their size or
-field offset or alignment. Calling a trait looks like a procedure call but
-traits names start with a `#` and their arguments are type expressions and
-not value expressions.
-
-Supported compiler traits:
-
-- `#size(T)` queries type size.
-- `#align(T)` queries type alignment.
-- `#offset(T, F)` queries the offset of the field `F` in the record `T`.
-
-== Appendix
-
-=== Syntax
-
-```
-letter = "A" | "B" | … | "Z" | "a" | "b" | … | "z" | "_".
-digit = "0" | "1" | "2" | "3" | "4" | "5" | "6" | "7" | "8" | "9".
-character = ? a printable character ?.
-hex-digit = digit | "A" | "B" | … | "F" | "a" | "b" | … | "f".
-binary-digit = "0" | "1".
-
-identifier = letter {letter | digit}.
-identifier-definition = identifier ["*"].
-trait-identifier = "#" identifier.
-
-integer-literal = digit {digit}.
-word-literal = integer-literal "u"
-    | "0" ("X" | "x") hex-digit {hex-digit}
-    | "0" ("B" | "b") binary-digit {binary-digit}.
-real-literal = digit {digit} "." digit {digit}.
-string-literal = """ {character} """.
-character-literal = "'" {character} "'".
-
-literal = integer-literal | word-literal | real-literal
-    | string-literal | character-literal
-    | "true" | "false" | "nil".
-
-trait = trait-identifier "(" [types] ")".
-cast = "cast" "(" expression ":" type ")".
-procedure-call = designator "(" [expressions] ")".
-
-relation-operator = "=" | "<>" | "<" | ">" | "<=" | ">=".
-multiplication-operator = "*" | "/" | "%".
-addition-operator = "+" | "-".
-shift-operator = "<<" | ">>".
-unary-operator = "@" | "~" | "-".
-
-selector = "[" expression "]" | "." identifier | "^".
-case = expressions ":" optional-statements.
-
-designator = reference selector | identifier.
-reference = literal | designator | trait | cast | procedure-call
-    | "(" expression ")".
-factor = unary-operator factor | reference.
-term = factor {multiplication-operator factor}.
-simple-expression = term {addition-operator term}.
-comparand = simple-expression {shift-operator simple-expression}.
-relation = comparand {relation-operator comparand}.
-operand = relation {"&" relation}.
-expression = operand {("or" | "xor") operand}.
-
-expressions = expression {"," expression}.
-identifier-definitions = identifier-definition {"," identifier-definition}.
-types = type {"," type}.
-required-statements = statement {";" statement}.
-optional-statements = [required-statements].
-
-return-declaration = ["->" "!" | "->" type].
-
-field = identifier ":" type.
-array-type = "[" expression "]" type.
-pointer-type = "^" type.
-record-type = "record" ["(" identifier ")"] [field {";" field}] "end".
-enumeration-type = "(" identifier {"," identifier} ")".
-procedure-type = "proc" "(" [types] ")" return-declaration.
-type = array-type | pointer-type | record-type | enumeration-type
-    | procedure-type | identifier.
-
-assignment = designator ":=" expression.
-if-statement = "if" expression "then" optional-statements
-    {"elsif" expression "then" optional-statements}
-    ["else" optional-statements] "end".
-while-statement = "while" expression "do" optional-statements
-    {"elsif" expression "do" optional-statements} "end".
-defer-statement = "defer" optional-statements "end".
-case-statement = "case" expression "of" case {"|" case}
-    ["else" optional-statements] "end".
-label-declaration = "." identifier.
-goto-statement = "goto" identifier.
-statement = assignment | procedure-call | defer-statement
-    | label-declaration | goto-statement |
-    | while-statement | if-statement | case-statement.
-statement-part = ["begin" required-statements | "return" expression
-    | "begin" required-statements ";" "return" expression].
-
-constant-declaration = identifier-definition ":=" expression.
-constant-part = ["const" {constant-declaration ";"}].
-variable-declaration = identifier-definitions ":" type
-    [":=" (expression | "extern")].
-variable-part = ["var" {variable-declaration ";"}].
-type_declaration = identifier-definition "=" type.
-type-part ["type" {type-declaration ";"}].
-import-declaration = identifier {"." identifier}.
-import-part = ["import" {import_declarations ";"}].
-
-procedure-heading = "proc" identifier-definition
-    "(" [field {"," field}] ")" return-declaration.
-block = constant-part variable-part statement-part "end".
-procedure-declaration = procedure-heading ";" (block | "extern").
-
-declaration-sequence = import-part
-    constant-part type-part variable-part {procedure-declaration ";"}.
-program = "program" ";" declaration-sequence statement-part "end" "."
-    | "module" ";" declaration-sequence "end" "."
-```