def METHOD_NAME(self):
    DepexExpressionList = []
    if not self._FileSectionDataList:
        return DepexExpressionList
    for SectionDataDict in self._FileSectionDataList:
        for key in SectionDataDict:
            if key.lower() == "[depex]" or key.lower().startswith("[depex."):
                SectionLine = key.lstrip(TAB_SECTION_START).rstrip(TAB_SECTION_END)
                SubSectionList = [SectionLine]
                if str(SectionLine).find(TAB_COMMA_SPLIT) > -1:
                    SubSectionList = str(SectionLine).split(TAB_COMMA_SPLIT)
                for SubSection in SubSectionList:
                    SectionList = SubSection.split(TAB_SPLIT)
                    SubKey = ()
                    if len(SectionList) == 1:
                        SubKey = (TAB_ARCH_COMMON, TAB_ARCH_COMMON)
                    elif len(SectionList) == 2:
                        SubKey = (SectionList[1], TAB_ARCH_COMMON)
                    elif len(SectionList) == 3:
                        SubKey = (SectionList[1], SectionList[2])
                    else:
                        EdkLogger.error("build", AUTOGEN_ERROR, 'Section %s is invalid.' % key)
                    DepexExpressionList.append({SubKey: SectionDataDict[key]})
    return DepexExpressionList