+def revert_language(document, lyxname, babelname, polyglossianame):
+ " Revert native language support "
+
+ # Are we using polyglossia?
+ use_polyglossia = False
+ if get_bool_value(document.header, "\\use_non_tex_fonts"):
+ i = find_token(document.header, "\\language_package")
+ if i == -1:
+ document.warning("Malformed document! Missing \\language_package")
+ else:
+ pack = get_value(document.header, "\\language_package", i)
+ if pack == "default" or pack == "auto":
+ use_polyglossia = True
+
+ # Do we use this language with polyglossia?
+ with_polyglossia = use_polyglossia and polyglossianame != ""
+ # Do we use this language with babel?
+ with_babel = with_polyglossia == False and babelname != ""
+
+ # Are we dealing with a primary or secondary language?
+ primary = False
+ secondary = False
+
+ orig_doc_language = document.language
+ # Main language first
+ if document.language == lyxname:
+ primary = True
+ document.language = "english"
+ i = find_token(document.header, "\\language %s" % lyxname, 0)
+ if i != -1:
+ document.header[i] = "\\language english"
+ j = find_token(document.header, "\\language_package default", 0)
+ if j != -1:
+ document.header[j] = "\\language_package default"
+ if with_polyglossia:
+ add_to_preamble(document, ["\\AtBeginDocument{\setotherlanguage{%s}}" % polyglossianame])
+ document.body[2 : 2] = ["\\begin_layout Standard",
+ "\\begin_inset ERT", "status open", "",
+ "\\begin_layout Plain Layout", "", "",
+ "\\backslash",
+ "resetdefaultlanguage{%s}" % polyglossianame,
+ "\\end_layout", "", "\\end_inset", "", "",
+ "\\end_layout", ""]
+
+ # Now secondary languages
+ i = 0
+ while True:
+ i = find_token(document.body, '\\lang', i)
+ if i == -1:
+ break
+ if document.body[i].startswith('\\lang %s' % lyxname):
+ secondary = True
+ endlang = get_containing_layout(document.body, i)[2]
+ langswitch = find_token(document.body, '\\lang', i + 1, endlang)
+ startlayout = "\\begin_layout Standard"
+ endlayout = "\\end_layout"
+ if langswitch != -1:
+ endlang = langswitch
+ startlayout = ""
+ endlayout = ""
+ if with_polyglossia:
+ add_to_preamble(document, ["\\AtBeginDocument{\setotherlanguage{%s}}" % polyglossianame])
+ document.body[endlang : endlang] = [startlayout,
+ "\\begin_inset ERT", "status open", "",
+ "\\begin_layout Plain Layout", "", "",
+ "\\backslash",
+ "end{%s}" % polyglossianame,
+ "\\end_layout", "", "\\end_inset", "", "",
+ endlayout, ""]
+ elif with_babel:
+ document.body[endlang : endlang] = [startlayout,
+ "\\begin_inset ERT", "status open", "",
+ "\\begin_layout Plain Layout", "", "",
+ "\\backslash",
+ "end{otherlanguage}",
+ "\\end_layout", "", "\\end_inset", "", "",
+ endlayout, ""]
+ del document.body[i]
+ if with_polyglossia:
+ document.body[i : i] = ["\\begin_inset ERT", "status open", "",
+ "\\begin_layout Plain Layout", "", "",
+ "\\backslash",
+ "begin{%s}" % polyglossianame,
+ "\\end_layout", "", "\\end_inset", "", "",
+ ""]
+ elif with_babel:
+ document.body[i : i] = ["\\begin_inset ERT", "status open", "",
+ "\\begin_layout Plain Layout", "", "",
+ "\\backslash",
+ "begin{otherlanguage}{%s}" % babelname,
+ "\\end_layout", "", "\\end_inset", "", "",
+ ""]
+ elif primary and document.body[i].startswith('\\lang english'):
+ # Since we switched the main language manually, English parts need to be marked
+ endlang = get_containing_layout(document.body, i)[2]
+ langswitch = find_token(document.body, '\\lang', i + 1, endlang)
+ startlayout = "\\begin_layout Standard"
+ endlayout = "\\end_layout"
+ if langswitch != -1:
+ endlang = langswitch
+ startlayout = ""
+ endlayout = ""
+ if with_polyglossia:
+ parent = get_containing_layout(document.body, i)
+ document.body[endlang : endlang] = [startlayout,
+ "\\begin_inset ERT", "status open", "",
+ "\\begin_layout Plain Layout", "", "",
+ "\\backslash",
+ "end{english}",
+ "\\end_layout", "", "\\end_inset", "", "",
+ endlayout, ""]
+ elif with_babel:
+ parent = get_containing_layout(document.body, i)
+ document.body[endlang : endlang] = [startlayout,
+ "\\begin_inset ERT", "status open", "",
+ "\\begin_layout Plain Layout", "", "",
+ "\\backslash",
+ "end{otherlanguage}",
+ "\\end_layout", "", "\\end_inset", "", "",
+ endlayout, ""]
+ del document.body[i]
+ if with_polyglossia:
+ document.body[i : i] = ["\\begin_inset ERT", "status open", "",
+ "\\begin_layout Plain Layout", "", "",
+ "\\backslash",
+ "begin{english}",
+ "\\end_layout", "", "\\end_inset", "", "",
+ ""]
+ elif with_babel:
+ document.body[i : i] = ["\\begin_inset ERT", "status open", "",
+ "\\begin_layout Plain Layout", "", "",
+ "\\backslash",
+ "begin{otherlanguage}{english}",
+ "\\end_layout", "", "\\end_inset", "", "",
+ ""]
+ else:
+ i += 1
+
+ # With babel, we need to add the language options
+ if with_babel and (primary or secondary):
+ insert_document_option(document, babelname)
+ if secondary and document.body[10] != "selectlanguage{%s}" % orig_doc_language:
+ # Since the user options are always placed after the babel options,
+ # we need to reset the main language
+ document.body[2 : 2] = ["\\begin_layout Standard",
+ "\\begin_inset ERT", "status open", "",
+ "\\begin_layout Plain Layout", "", "",
+ "\\backslash",
+ "selectlanguage{%s}" % orig_doc_language,
+ "\\end_layout", "", "\\end_inset", "", "",
+ "\\end_layout", ""]
+