Examples of org.luaj.vm2.LuaClosure

org.luaj.vm2.lib.ThreeArgFunction
Extension of {@link LuaFunction} which executes lua bytecode.
A {@link LuaClosure} is a combination of a {@link Prototype} and a {@link LuaValue} to use as an environment for execution.
There are three main ways {@link LuaClosure} instances are created:
- Construct an instance using {@link #LuaClosure(Prototype,LuaValue)}
- Construct it indirectly by loading a chunk via {@link LuaCompiler#load(java.io.InputStream,String,LuaValue)}
- Execute the lua bytecode {@link Lua#OP_CLOSURE} as part of bytecode processing
To construct it directly, the {@link Prototype} is typically created via a compiler such as {@link LuaC}:
```
  {@code InputStream is = new ByteArrayInputStream("print('hello,world').getBytes()); Prototype p = LuaC.instance.compile(is, "script"); LuaValue _G = JsePlatform.standardGlobals() LuaClosure f = new LuaClosure(p, _G);}
```
To construct it indirectly, the {@link LuaC} compiler may be used, which implements the {@link LuaCompiler} interface:
```
  {@code LuaFunction f = LuaC.instance.load(is, "script", _G);}
```
Typically, a closure that has just been loaded needs to be initialized by executing it, and its return value can be saved if needed:
```
  {@code LuaValue r = f.call(); _G.set( "mypkg", r ) }
```
In the preceding, the loaded value is typed as {@link LuaFunction} to allow for the possibility of other compilers such as {@link LuaJC}producing {@link LuaFunction} directly without creating a {@link Prototype} or {@link LuaClosure}.
Since a {@link LuaClosure} is a {@link LuaFunction} which is a {@link LuaValue}, all the value operations can be used directly such as:
- {@link LuaValue#setfenv(LuaValue)}
- {@link LuaValue#call()}
- {@link LuaValue#call(LuaValue)}
- {@link LuaValue#invoke()}
- {@link LuaValue#invoke(Varargs)}
- {@link LuaValue#method(String)}
- {@link LuaValue#method(String,LuaValue)}
- {@link LuaValue#invokemethod(String)}
- {@link LuaValue#invokemethod(String,Varargs)}
- ...
@see LuaValue @see LuaFunction @see LuaValue#isclosure() @see LuaValue#checkclosure() @see LuaValue#optclosure(LuaClosure) @see LoadState @see LoadState#compiler

            }
        };
    }


    private LuaValue messagePlain() {
        return new OneArgFunction() {
            @Override
            public LuaValue call(LuaValue data) {
                return new Message(data).plain();
            }
        };

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            }
        };
    }


    private LuaValue fileExists() {
        return new OneArgFunction() {
            /**
             * @param page
             * @return Whether the file exists. For File- and Media-namespace titles, this is
             * expensive. It will also be recorded as an image usage for File- and Media-namespace titles.
             */

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            }
        };
    }


    private LuaValue getContent() {
        return new OneArgFunction() {
            /**
             * @param page
             * @return the (unparsed) content of the page, or nil if there is no page.
             * The page will be recorded as a transclusion.
             */

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        table.set("usersInGroup", usersInGroup());
        return table;
    }


    private LuaValue usersInGroup() {
        return new OneArgFunction() {
            @Override public LuaValue call(LuaValue group) {
                return LuaValue.valueOf(0);
            }
        };
    }

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            }
        };
    }


    private LuaValue pagesInNamespace() {
        return new OneArgFunction() {
            @Override public LuaValue call(LuaValue ns) {
                return LuaValue.valueOf(0);
            }
        };
    }

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            }
        };
    }


    private LuaValue getNsIndex() {
        return new OneArgFunction() {
            @Override
            /**
             * Get a namespace key by value, case insensitive.  Canonical namespace
             * names override custom ones defined for the current language.
             *

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        iface.set("canonicalUrl", canonicalUrl());
        return iface;
    }


    private LuaValue anchorEncode() {
        return new OneArgFunction() {
            @Override
            public LuaValue call(LuaValue arg) {
                return null;
            }
        };

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    protected OneArgFunction defaultFunction() {
        return defaultFunction(null);
    }


    protected OneArgFunction defaultFunction(final String argName) {
        return new OneArgFunction() {
            @Override
            public LuaValue call(LuaValue arg) {
                // logger.warn("defaultFunction " + argName + " called");
                return LuaValue.NIL;
            }

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        table.set("isSubsting", isSubsting());
        return table;
    }


    private LuaValue callParserFunction() {
        return new ThreeArgFunction() {
            @Override public LuaValue call(LuaValue frameId, LuaValue function, LuaValue args) {
                return null;
            }
        };
    }

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            }
        };
    }


    private LuaValue expandTemplate() {
        return new ThreeArgFunction() {
            @Override
            public LuaValue call(LuaValue frameId, LuaValue title, LuaValue args) {
                throw new UnsupportedOperationException("no implemented");
            }
        };

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