DefaultSourceParserFunc parse input and assign value.

DefaultValidFunc default valic func when custom valid func is nil.

NewCommandIterator 创建辛的迭代器.

DebugCommandDef debug command define.

ResetCommandDef reset command define.

ShowCommandDef show information.

UndoCommandDef undo operation.

UndoIdentity undo identity.

CommandIterator command iterator.

CommandList 命令参数.

CommandWord 命令参数.

CommandWordDef define command keyword.

CommandWordDefElem 命令元组.

CommandWordGroup 元组.

SourceParserFunc func.

ValidFunc func.