|
| 1 | +""" |
| 2 | + pyexcel_pdfr.pdfr |
| 3 | + ~~~~~~~~~~~~~~~~~~~ |
| 4 | + html table reader using messytables |
| 5 | +
|
| 6 | + :copyright: (c) 2015-2017 by Onni Software Ltd & its contributors |
| 7 | + :license: New BSD License |
| 8 | +""" |
| 9 | +import re |
| 10 | +import datetime |
| 11 | + |
| 12 | +from pdftables import get_tables |
| 13 | +from pyexcel_io.book import BookReader |
| 14 | +from pyexcel_io.sheet import SheetReader, NamedContent |
| 15 | +from pyexcel_io._compact import OrderedDict |
| 16 | + |
| 17 | + |
| 18 | +class PdfTable(SheetReader): |
| 19 | + def __init__(self, sheet, auto_detect_int=True, |
| 20 | + auto_detect_float=True, |
| 21 | + auto_detect_datetime=True, |
| 22 | + **keywords): |
| 23 | + SheetReader.__init__(self, sheet, **keywords) |
| 24 | + self.__auto_detect_int = auto_detect_int |
| 25 | + self.__auto_detect_float = auto_detect_float |
| 26 | + self.__auto_detect_datetime = auto_detect_datetime |
| 27 | + self.__table = self._native_sheet.payload |
| 28 | + self.__column_span = {} |
| 29 | + |
| 30 | + @property |
| 31 | + def name(self): |
| 32 | + return self._native_sheet.name |
| 33 | + |
| 34 | + def row_iterator(self): |
| 35 | + if hasattr(self.__table, "cell_data"): |
| 36 | + # New style of cell data. |
| 37 | + for row in self.__table.cell_data: |
| 38 | + yield [pdf_cell for pdf_cell in row] |
| 39 | + else: |
| 40 | + for row in self.__table: |
| 41 | + yield [pdf_cell for pdf_cell in row] |
| 42 | + |
| 43 | + def column_iterator(self, row): |
| 44 | + index = 0 |
| 45 | + for cell in row: |
| 46 | + # generate '' due to previous rowspan |
| 47 | + while index in self.__column_span: |
| 48 | + # and keep generating '' if next index is in the list |
| 49 | + self.__column_span[index] -= 1 |
| 50 | + if self.__column_span[index] == 0: |
| 51 | + del self.__column_span[index] |
| 52 | + yield '' |
| 53 | + index += 1 |
| 54 | + |
| 55 | + if not hasattr(cell, 'topleft'): |
| 56 | + yield cell |
| 57 | + index += 1 |
| 58 | + continue |
| 59 | + |
| 60 | + col_span, row_span = cell.size |
| 61 | + yield self.__convert_cell(cell.content) |
| 62 | + if row_span > 1: |
| 63 | + # generate '' due to colspan |
| 64 | + if col_span > 1: |
| 65 | + for offset in range(row_span): |
| 66 | + if offset > 0: |
| 67 | + # for next cell, give full col span |
| 68 | + self.__column_span[index+offset] = col_span |
| 69 | + else: |
| 70 | + # for current cell, give -1 because it has been |
| 71 | + # yielded |
| 72 | + self.__column_span[index+offset] = col_span - 1 |
| 73 | + else: |
| 74 | + # no col span found, so just repeat in the same row |
| 75 | + for _ in range(row_span-1): |
| 76 | + yield '' |
| 77 | + index += 1 |
| 78 | + else: |
| 79 | + if col_span > 1: |
| 80 | + self.__column_span[index] = col_span - 1 |
| 81 | + # next index |
| 82 | + index += 1 |
| 83 | + |
| 84 | + def __convert_cell(self, cell_text): |
| 85 | + ret = None |
| 86 | + if self.__auto_detect_int: |
| 87 | + ret = _detect_int_value(cell_text) |
| 88 | + if ret is None and self.__auto_detect_float: |
| 89 | + ret = _detect_float_value(cell_text) |
| 90 | + shall_we_ignore_the_conversion = ( |
| 91 | + (ret in [float('inf'), float('-inf')]) and |
| 92 | + self.__ignore_infinity |
| 93 | + ) |
| 94 | + if shall_we_ignore_the_conversion: |
| 95 | + ret = None |
| 96 | + if ret is None and self.__auto_detect_datetime: |
| 97 | + ret = _detect_date_value(cell_text) |
| 98 | + if ret is None: |
| 99 | + ret = cell_text |
| 100 | + return ret |
| 101 | + |
| 102 | + |
| 103 | +class PdfFile(BookReader): |
| 104 | + def __init__(self): |
| 105 | + BookReader.__init__(self) |
| 106 | + self._file_handle = None |
| 107 | + |
| 108 | + def open(self, file_name, **keywords): |
| 109 | + BookReader.open(self, file_name, **keywords) |
| 110 | + self._load_from_file() |
| 111 | + |
| 112 | + def open_stream(self, file_stream, **keywords): |
| 113 | + BookReader.open_stream(self, file_stream, **keywords) |
| 114 | + self._load_from_memory() |
| 115 | + |
| 116 | + def read_all(self): |
| 117 | + result = OrderedDict() |
| 118 | + for sheet in self._native_book: |
| 119 | + result.update(self.read_sheet(sheet)) |
| 120 | + return result |
| 121 | + |
| 122 | + def read_sheet(self, native_sheet): |
| 123 | + sheet = PdfTable(native_sheet, **self._keywords) |
| 124 | + return {sheet.name: sheet.to_array()} |
| 125 | + |
| 126 | + def _load_from_file(self): |
| 127 | + self._file_handle = open(self._file_name, 'rb') |
| 128 | + self._native_book = self._parse_pdf(self._file_handle) |
| 129 | + |
| 130 | + def _load_from_memory(self): |
| 131 | + self._native_book = self._parse_pdf(self._file_stream) |
| 132 | + |
| 133 | + def _parse_pdf(self, file_handle): |
| 134 | + for table in get_tables(file_handle): |
| 135 | + name = "Table {0} of {1} on page {2} of {3}".format( |
| 136 | + table.table_number_on_page, |
| 137 | + table.total_tables_on_page, |
| 138 | + table.page_number, |
| 139 | + table.total_pages) |
| 140 | + yield NamedContent(name, table) |
| 141 | + |
| 142 | + def close(self): |
| 143 | + if self._file_handle: |
| 144 | + self._file_handle.close() |
| 145 | + |
| 146 | + |
| 147 | +def _detect_date_value(csv_cell_text): |
| 148 | + """ |
| 149 | + Read the date formats that were written by csv.writer |
| 150 | + """ |
| 151 | + ret = None |
| 152 | + try: |
| 153 | + if len(csv_cell_text) == 10: |
| 154 | + ret = datetime.datetime.strptime( |
| 155 | + csv_cell_text, |
| 156 | + "%Y-%m-%d") |
| 157 | + ret = ret.date() |
| 158 | + elif len(csv_cell_text) == 19: |
| 159 | + ret = datetime.datetime.strptime( |
| 160 | + csv_cell_text, |
| 161 | + "%Y-%m-%d %H:%M:%S") |
| 162 | + elif len(csv_cell_text) > 19: |
| 163 | + ret = datetime.datetime.strptime( |
| 164 | + csv_cell_text[0:26], |
| 165 | + "%Y-%m-%d %H:%M:%S.%f") |
| 166 | + except ValueError: |
| 167 | + pass |
| 168 | + return ret |
| 169 | + |
| 170 | + |
| 171 | +def _detect_float_value(csv_cell_text): |
| 172 | + try: |
| 173 | + should_we_skip_it = (csv_cell_text.startswith('0') and |
| 174 | + csv_cell_text.startswith('0.') is False) |
| 175 | + if should_we_skip_it: |
| 176 | + # do not convert if a number starts with 0 |
| 177 | + # e.g. 014325 |
| 178 | + return None |
| 179 | + else: |
| 180 | + return float(csv_cell_text) |
| 181 | + except ValueError: |
| 182 | + return None |
| 183 | + |
| 184 | + |
| 185 | +def _detect_int_value(csv_cell_text): |
| 186 | + if csv_cell_text.startswith('0') and len(csv_cell_text) > 1: |
| 187 | + return None |
| 188 | + try: |
| 189 | + return int(csv_cell_text) |
| 190 | + except ValueError: |
| 191 | + pattern = '([0-9]+,)*[0-9]+$' |
| 192 | + if re.match(pattern, csv_cell_text): |
| 193 | + integer_string = csv_cell_text.replace(',', '') |
| 194 | + return int(integer_string) |
| 195 | + else: |
| 196 | + return None |
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