org.millscript.millscript.syntax
Class WhileSyntax

java.lang.Object
  org.millscript.millscript.syntax.Syntax
      org.millscript.millscript.syntax.PrefixSyntax
          org.millscript.millscript.syntax.WhileSyntax

All Implemented Interfaces:

PrefixSyntaxInterface

public final class WhileSyntax
extends PrefixSyntax

This class implements the while syntax. This syntax represents a simple loop construct.

while <expr> do <expr> endwhile

The while expression is evaluated on each pass of the loop, it must return a single, boolean, result. If this expression evaluates to true, the body expression will be evaluated, and the loop repeated. If the while expression is false the loop terminates.

See Also:

WhileExpr

Constructor Summary

WhileSyntax()

Method Summary

WhileExpr

prefix(java.lang.String sym, Parser parser) Parse the syntax for the specified symbol, using the specified Parser.

Methods inherited from class java.lang.Object

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

Constructor Detail

WhileSyntax

public WhileSyntax()

Method Detail

prefix

public WhileExpr prefix(java.lang.String sym,
                        Parser parser)

Description copied from interface: PrefixSyntaxInterface

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.

Specified by:

prefix in interface PrefixSyntaxInterface

Specified by:

prefix in class PrefixSyntax

Parameters:

sym - the symbol to parse this syntax for

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

Returns:

an expression for this syntax

See Also:

PrefixSyntaxInterface.prefix(java.lang.String, org.millscript.millscript.syntax.Parser)