org.millscript.millscript.syntax
Class RelationalOperationSyntax

java.lang.Object
  org.millscript.millscript.syntax.Syntax
      org.millscript.millscript.syntax.PostfixSyntax
          org.millscript.millscript.syntax.RelationalOperationSyntax

All Implemented Interfaces:

PostfixSyntaxInterface

public class RelationalOperationSyntax
extends PostfixSyntax

This class represents infix syntax, a variant of postfix syntax. This is used in situations where the syntax sits 'in'-between its arguments and maps to a function call. The syntax follows the form:

<expr> S <expr>

which is very similar to the SimplePostfixSyntax, but it maps to a function call(actually an ApplyExpr). e.g. it's almost the equivalent of writing:

S( <expr>, <expr> )

To implement a new piece of infix syntax simply requires that you create a new function and map it to the relevant symbol in the Parser.

See Also:

ApplyExpr

Constructor Summary

RelationalOperationSyntax()

Method Summary

Expr	postfix(java.lang.String sym, int prec, Expr lhs, Parser parser) Parse the syntax for the specified symbol, using the specified Parser.

Methods inherited from class org.millscript.millscript.syntax.PostfixSyntax

getPrecedence, setPrec

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

RelationalOperationSyntax

public RelationalOperationSyntax()

Method Detail

postfix

public Expr postfix(java.lang.String sym,
                    int prec,
                    Expr lhs,
                    Parser parser)

Description copied from interface: PostfixSyntaxInterface

Parse the syntax for the specified symbol, using the specified Parser. The symbol is specified because different symbols may share the same syntax, but result in slightly different expressions. The Parser is supplied as the source to parse from. As this is postfix syntax, we are also supplied the expression on the left hand side of the symbol along with the current precedence we should parse to.

Specified by:

postfix in interface PostfixSyntaxInterface

Specified by:

postfix in class PostfixSyntax

Parameters:

sym - the symbol to parse this syntax for

prec - the current precedence we should parse to

lhs - the expression on the left hand side of the specified symbol

parser - Parser to parse from, i.e. the source to parse from

Returns:

an expression for this syntax

See Also:

PostfixSyntaxInterface.postfix(java.lang.String, int, org.millscript.millscript.expr.Expr, org.millscript.millscript.syntax.Parser)