""" Program for converting Latex files into html files """ def command_name_check(latex_string, command_name): if latex_string[1: (len(command_name) + 1)] != command_name: print(latex_string + "Error! command misspeled!") return "Error!" return def generic_checks(latex_string): if latex_string == "": print(latex_string + "Error! No input given to function") return "Error!" if "}" not in latex_string: print(latex_string + "Error! curly bracket not closed!") return "Error!" return def generic_checks_command(latex_string): if generic_checks(latex_string) == "Error!": return "Error!" if latex_string[0] != "\\": print(latex_string + "Error! has no slash at begining") return "Error!" return def document_class(latex_string): r""" Converts LaTeX documentclass method to html \documentclass{article} """ if generic_checks_command(latex_string) == "Error!": return "Error!" if latex_string[len("\\documentclass{") - 1] != "{": print(latex_string + "Error! curly bracket not opened!") return "Error!" if command_name_check(latex_string, "documentclass") == "Error!": return "Error!" document_type = latex_string[len( "\\documentclass{"): (len(latex_string) - 1)] return "" def begin_document(latex_string): r""" Converts LaTeX begin document method to html \begin{document} """ if generic_checks_command(latex_string) == "Error!": return "Error!" if command_name_check(latex_string, "begin") == "Error!": return "Error!" return "" def begin_tabular(latex_string): r""" Checks if LaTeX begin tabular method is correct """ if generic_checks_command(latex_string) == "Error!": return "Error!" if command_name_check(latex_string, "begin") == "Error!": return "Error!" return "" def tabular_parameters(latex_string): r""" Checks if LaTeX tabular environment has any parameters """ if latex_string == "": return "" if latex_string == "[]": return "" return "Error!" def only_pipes_and_space(latex_string): """Checks if latex string only contains | or " ", if yes returns True, if no returns false""" return all(char == '|' or char == ' ' or char == '{' or char == '}' for char in latex_string) def main_tabular_parameters_loop(latex_string, simple_parameters_dictionary): return_array = [] i = 0 latex_string_length = len(latex_string) while i < latex_string_length: character = latex_string[i] if character in ['l', 'c', 'r', '|']: return_array.append( simple_parameters_dictionary.get(latex_string[i])) i += 1 continue if character in ['p', 'm', 'b']: closing_bracket = latex_string.find('}', i + 1) columns_string = latex_string[i:closing_bracket + 1] result = tabular_columns_parameters(columns_string) if result == "Error!": return result return_array.append(result) i = closing_bracket continue i += 1 return return_array def tabular_required_parameters(latex_string): if generic_checks(latex_string) == "Error!": return "Error!" if latex_string == "{}": print("tabular_required_parameters, required table parameters are empty!:", latex_string) return "Error!" simple_parameters_dictionary = { "l": "align='left'", "c": "align='center'", "r": "align='right'", "|": "style='border-left: 1px solid black'" } if only_pipes_and_space(latex_string): print("tabular_required_parameters, required table parameters are only pipes and spaces!:", latex_string) return "Error!" return main_tabular_parameters_loop(latex_string, simple_parameters_dictionary) def length_conversions(latex_length): length_dictionary = { "pt": [1.3, "px"], "mm": [1, "mm"], "cm": [1, "cm"], "in": [1, "in"], "ex": [1, "ex"], "em": [1, "em"], } return length_dictionary.get(latex_length, "Error!") def tabular_columns_parameters(latex_string): if generic_checks(latex_string) == "Error!": return "Error!" parameter_dictionary = { "p": "vertical-align: top;", "m": "vertical-align: middle;", "b": "vertical-align: bottom;" } vertical_align_type = parameter_dictionary.get(latex_string[0], "Error!") if vertical_align_type == "Error!": print("tabular_columns_parameters, unknown parameter: ", latex_string[0]) return "Error!" if latex_string[1] != '{': print( "tabular_columns_parameters, parameter length does not start with {", latex_string) return "Error!" length_parameter_with_bracket = latex_string.partition("{")[2] length_parameter = length_parameter_with_bracket.partition("}")[0] length_value = "" i = 0 for character in length_parameter: if character.isalpha(): break length_value += character i += 1 length_unit = length_parameter[i:] conversed_unit = length_conversions(length_unit) if conversed_unit == "Error!": print("tabular_columns_parameters, Unit could not be conversed!", latex_string) return "Error!" final_length = round(float(length_value) * conversed_unit[0], 2) return_string = "style='" + vertical_align_type + \ " width: " + str(final_length) + conversed_unit[1] + ";'" return return_string def split_rows(latex_string): double_backslash = "\\" rows = latex_string.split(double_backslash) return rows def split_columns(table_row, column_count): columns = table_row.split("&") if len(columns) != column_count and columns != ['']: return "Error!" return columns def translate_column(latex_column): hline_string_literal = "\hline" replaced_hline = latex_column.replace(hline_string_literal, "

") replaced_newline = replaced_hline.replace('\newline', "
") return replaced_newline def translate_inside_to_html(latex_table_inside, column_style): return_string = "

" column_amount = 0 line_string = "style='border-left: 1px solid black'" for style in column_style: if style != line_string: column_amount += 1 rows = split_rows(latex_table_inside) for row in rows: return_string += "" columns = split_columns(row, column_amount) column_number = 0 for column in columns: return_string += "" return_string += "" return_string += "

" return_string += translate_column(column) column_number += 1 return_string += "

" return return_string def read_file(tex_filename): tex_file = open(tex_filename, "r") data = tex_file.read().replace('\n', '') tex_file.close() return data def read_document_class(latex_full_string): document_class_index = latex_full_string.find("\documentclass") if document_class_index == -1: print("Main function error! documentclass not found") return "Error!" document_class_close_bracket = latex_full_string.find( "}", document_class_index) document_class_string = latex_full_string[document_class_index:document_class_close_bracket + 1] latex_full_string = latex_full_string[document_class_close_bracket + 1:len( latex_full_string) - 1] return document_class(document_class_string), latex_full_string def read_begin_document(latex_full_string): begin_document_index = latex_full_string.find(r"\begin{document}") if begin_document_index == -1: print("read_begin_document error! begin{document not found") return "Error!", latex_full_string begin_document_close_bracket = latex_full_string.find( "}", begin_document_index) begin_document_string = latex_full_string[begin_document_index:begin_document_close_bracket + 1] latex_full_string = latex_full_string[begin_document_close_bracket + 1:len( latex_full_string) - 1] return_string = begin_document(begin_document_string) return return_string, latex_full_string def read_start(html_string, data): document_class_result, data = read_document_class(data) if document_class_result == "Error!": return "Error!", data html_string += document_class_result begin_document_results, data = read_begin_document(data) if begin_document_results == "Error!": return "Error!", data html_string += begin_document_results return html_string, data def handle_table_whole(html_string, data, table_start, table_end): if table_start == -1 or table_end == -1: return html_string, data tabular_begin_string = r"\begin{tabular}" tabular_end_string = r"\end{tabular}" table_part = data[table_start:table_end+len(tabular_end_string)] parameters_start_index = data.find( "{", table_start + len(tabular_begin_string)) parameters_end_index = data.find("}", parameters_start_index) parameters_string = data[parameters_start_index:parameters_end_index+1] parameters_array = tabular_required_parameters(parameters_string) inside_table = data[parameters_end_index+1:table_end] html_string += translate_inside_to_html(inside_table, parameters_array) return html_string def handle_insides(html_string, data): tabular_index = 0 tabular_end_string = r"\end{tabular}" while tabular_index != -1: tabular_index_start = data.find(r"\begin{tabular}", 0) tabular_index_end = data.find(tabular_end_string, tabular_index_start) if tabular_index_start == -1 or tabular_index_end == -1: return html_string, data html_string += data[0:tabular_index_start] html_string = handle_table_whole(html_string, data, tabular_index_start, tabular_index_end) data = data[tabular_index_end + len(tabular_end_string):len(data)] tabular_index = tabular_index_end return html_string, data def main_function(): tex_filename = "texfile.tex" data = read_file(tex_filename) html_string = "" html_string, data = read_start(html_string, data) if html_string == "Error!": print("main_function error! when reading documentclass or begin document") return "Error" html_string, data = handle_insides(html_string, data) return html_string if __name__ == "__main__": print(main_function())