Expr

From CometPublic

[edit] Overview

Expressions can be used on the right hand of the "<-" operator to assign and incremental value to an incremental variable. Example:

var{int} c(m) <- a + b;

Expressions are first class objects and can be directly manipulated:

expr{int} e = 2 * c - 5;

expr{int} e2 = c * c;

Then re-assigned to an incremental variable:

var{int} f(m) <- e * e2;

[edit] Basic Grammar for Expressions

• "int"
• NUM
• "null"
• "true"
• "false"
• STR
• "IntToString" '(' Exp ')'
• Exp '+' Exp
• Exp '-' Exp
• Exp '*' Exp
• Exp '/' Exp
• Exp '%' Exp
• Exp "&&" Exp
• Exp "||" Exp
• Exp "=>" Exp
• "!" Exp
• '-' Exp
• '+' Exp
• "abs" '(' Exp ')'
• "floor" '(' Exp ')'
• TTROUND '(' Exp ')'
• "ceil" '(' Exp ')'
• "sqrt" '(' Exp ')'
• "ln" '(' Exp ')'
• Exp '^' Exp
• Exp ".." Exp
• Exp '>' Exp
• Exp '<' Exp
• Exp "==" Exp
• Exp ">=" Exp
• Exp "<=" Exp
• Exp "!=" Exp
• Exp '?' Exp ':' Exp
• Exp "union" Exp
• Exp "inter" Exp
• Exp "cross" Exp
• Exp "\" Exp // Set Minus
• "member" '(' Exp ',' Exp ')'
• Lvalue
• '(' Exp ')'
• "setof" '(' ArrayParamDecl ')' Exp
• "all" '(' ListParamDecl ')' Exp
• "prod" '(' ListParamDecl ')' Exp
• "sum" '(' ListParamDecl ')' Exp
• "and" '(' ListParamDecl ')' Exp
• "or" '(' ListParamDecl ')' Exp
• "max" '(' ListParamDecl ')' Exp
• "argMax" '(' ParamDecl ')' Exp
• "min" '(' ListParamDecl ')' Exp
• "min" '(' Exp ',' Exp ')'
• "max" '(' Exp ',' Exp ')'
• "card" '(' Exp ')'
• "argMin" '(' ParamDecl ')' Exp
• '{' Exp '}'
• '{' TwoOrMoreExp '}'
• "lookahead" '(' Exp ',' Exp ')' Statement
• "closure" Statement
• "pclosure" Statement
• "thread" Statement
• "++" Lvalue
• Lvalue "++"
• "--" Lvalue
• Lvalue "--"
• Lvalue "instanceof" ID
• '(' "int" ')' Exp
• '(' "float" ')' Exp
• '(' Exp ')' Lvalue
• Exp "with" ID '(' Lvalue ')' Statement