B27_expressions.tex

\begin{lstlisting}[language=grammar]
expression :
   simple-expression
   | if expression then expression { elseif expression then expression }
   else expression

simple-expression :
   logical-expression [ ":" logical-expression [ ":" logical-expression ] ]

logical-expression :
   logical-term { or logical-term }

logical-term :
   logical-factor { and logical-factor }

logical-factor :
   [ not ] relation

relation :
   arithmetic-expression [ relational-operator arithmetic-expression ]

relational-operator :
   "<" | "<=" | ">" | ">=" | "==" | "<>"

arithmetic-expression :
   [ add-operator ] term { add-operator term }

add-operator :
   "+" | "-" | ".+" | ".-"

term :
   factor { mul-operator factor }

mul-operator :
   "*" | "/" | ".*" | "./"

factor :
   primary [ ("^" | ".^") primary ]

primary :
   UNSIGNED-NUMBER
   | STRING
   | false
   | true
   | ( component-reference | der | initial | pure ) function-call-args
   | component-reference
   | "(" output-expression-list ")"
   | "[" expression-list { ";" expression-list } "]"
   | "{" array-arguments "}"
   | end

type-specifier : ["."] name

name : IDENT { "." IDENT }

component-reference :
   [ "." ] IDENT [ array-subscripts ] { "." IDENT [ array-subscripts ] }

function-call-args :
   "(" [ function-arguments ] ")"

function-arguments :
expression [ "," function-arguments-non-first | for for-indices ]
   | function name "(" [ named-arguments ] ")" [ "," function-arguments-non-first ]
   | named-arguments

function-arguments-non-first :
   function-argument [ "," function-arguments-non-first ]
   | named-arguments

array-arguments :
   expression [ "," array-arguments-non-first | for for-indices ]

array-arguments-non-first :
   expression [ "," array-arguments-non-first ]

named-arguments: named-argument [ "," named-arguments ]

named-argument: IDENT "=" function-argument

function-argument :
   function name "(" [ named-arguments ] ")" | expression

output-expression-list:
   [ expression ] { "," [ expression ] }

expression-list :
   expression { "," expression }

array-subscripts :
   "[" subscript { "," subscript } "]"

subscript :
   ":" | expression

comment :
   string-comment [ annotation-comment ]

string-comment :
[ STRING { "+" STRING } ]

annotation-comment :
   annotation class-modification
\end{lstlisting}