[6] | 1 | module m_xml_parser |
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| 2 | |
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| 3 | ! |
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| 4 | ! Basic module to parse XML in the SAX spirit. |
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| 5 | ! |
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| 6 | |
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| 7 | use m_buffer |
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| 8 | use m_reader |
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| 9 | use m_fsm |
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| 10 | use m_dictionary |
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| 11 | use m_debug |
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| 12 | use m_xml_error |
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| 13 | use m_elstack ! For element nesting checks |
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| 14 | use m_entities |
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| 15 | ! |
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| 16 | private |
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| 17 | |
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| 18 | ! |
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| 19 | ! XML file handle |
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| 20 | ! |
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| 21 | type, public :: xml_t |
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| 22 | private |
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| 23 | type(file_buffer_t) :: fb |
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| 24 | type(fsm_t) :: fx |
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| 25 | character(len=200) :: path_mark |
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| 26 | end type xml_t |
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| 27 | |
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| 28 | ! |
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| 29 | public :: xml_parse |
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| 30 | public :: open_xmlfile, close_xmlfile |
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| 31 | public :: endfile_xmlfile, rewind_xmlfile |
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| 32 | public :: eof_xmlfile, sync_xmlfile |
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| 33 | public :: xml_char_count |
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| 34 | public :: xml_path, xml_mark_path, xml_get_path_mark |
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| 35 | public :: xml_name, xml_attributes |
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| 36 | |
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| 37 | CONTAINS !============================================================= |
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| 38 | |
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| 39 | subroutine open_xmlfile(fname,fxml,iostat,record_size) |
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| 40 | character(len=*), intent(in) :: fname |
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| 41 | integer, intent(out) :: iostat |
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| 42 | type(xml_t), intent(out) :: fxml |
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| 43 | integer, intent(in), optional :: record_size |
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| 44 | |
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| 45 | call open_file(fname,fxml%fb,iostat,record_size) |
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| 46 | call init_fsm(fxml%fx) |
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| 47 | fxml%path_mark = "" |
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| 48 | |
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| 49 | end subroutine open_xmlfile |
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| 50 | !------------------------------------------------------------------------- |
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| 51 | |
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| 52 | subroutine rewind_xmlfile(fxml) |
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| 53 | type(xml_t), intent(inout) :: fxml |
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| 54 | |
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| 55 | call rewind_file(fxml%fb) |
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| 56 | call reset_fsm(fxml%fx) |
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| 57 | fxml%path_mark = "" |
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| 58 | |
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| 59 | end subroutine rewind_xmlfile |
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| 60 | |
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| 61 | !----------------------------------------- |
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| 62 | subroutine endfile_xmlfile(fxml) |
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| 63 | type(xml_t), intent(inout) :: fxml |
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| 64 | |
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| 65 | call mark_eof_file(fxml%fb) |
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| 66 | |
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| 67 | end subroutine endfile_xmlfile |
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| 68 | |
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| 69 | !----------------------------------------- |
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| 70 | subroutine close_xmlfile(fxml) |
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| 71 | type(xml_t), intent(inout) :: fxml |
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| 72 | |
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| 73 | call close_file_buffer(fxml%fb) |
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| 74 | call reset_fsm(fxml%fx) ! just in case |
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| 75 | fxml%path_mark = "" ! "" |
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| 76 | |
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| 77 | end subroutine close_xmlfile |
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| 78 | |
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| 79 | !----------------------------------------- |
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| 80 | subroutine sync_xmlfile(fxml,iostat) |
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| 81 | type(xml_t), intent(inout) :: fxml |
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| 82 | integer, intent(out) :: iostat |
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| 83 | |
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| 84 | call sync_file(fxml%fb,iostat) |
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| 85 | ! Do not reset fx: that's the whole point of synching. |
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| 86 | |
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| 87 | end subroutine sync_xmlfile |
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| 88 | |
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| 89 | !---------------------------------------------------- |
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| 90 | function eof_xmlfile(fxml) result (res) |
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| 91 | type(xml_t), intent(in) :: fxml |
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| 92 | logical :: res |
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| 93 | |
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| 94 | res = eof_file(fxml%fb) |
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| 95 | |
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| 96 | end function eof_xmlfile |
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| 97 | ! |
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| 98 | !---------------------------------------------------- |
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| 99 | !---------------------------------------------------- |
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| 100 | function xml_char_count(fxml) result (nc) |
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| 101 | type(xml_t), intent(in) :: fxml |
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| 102 | integer :: nc |
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| 103 | |
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| 104 | nc = nchars_processed(fxml%fb) |
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| 105 | |
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| 106 | end function xml_char_count |
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| 107 | ! |
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| 108 | !---------------------------------------------------- |
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| 109 | ! |
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| 110 | |
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| 111 | subroutine xml_parse(fxml, begin_element_handler, & |
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| 112 | end_element_handler, & |
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| 113 | pcdata_chunk_handler, & |
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| 114 | comment_handler, & |
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| 115 | xml_declaration_handler, & |
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| 116 | cdata_section_handler, & |
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| 117 | sgml_declaration_handler, & |
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| 118 | error_handler, & |
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| 119 | signal_handler, & |
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| 120 | verbose, & |
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| 121 | empty_element_handler) |
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| 122 | |
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| 123 | type(xml_t), intent(inout), target :: fxml |
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| 124 | |
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| 125 | optional :: begin_element_handler |
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| 126 | optional :: end_element_handler |
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| 127 | optional :: pcdata_chunk_handler |
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| 128 | optional :: comment_handler |
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| 129 | optional :: xml_declaration_handler |
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| 130 | optional :: sgml_declaration_handler |
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| 131 | optional :: cdata_section_handler |
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| 132 | optional :: error_handler |
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| 133 | optional :: signal_handler |
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| 134 | logical, intent(in), optional :: verbose |
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| 135 | optional :: empty_element_handler |
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| 136 | |
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| 137 | interface |
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| 138 | subroutine begin_element_handler(name,attributes) |
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| 139 | use m_dictionary |
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| 140 | character(len=*), intent(in) :: name |
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| 141 | type(dictionary_t), intent(in) :: attributes |
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| 142 | end subroutine begin_element_handler |
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| 143 | |
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| 144 | subroutine end_element_handler(name) |
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| 145 | character(len=*), intent(in) :: name |
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| 146 | end subroutine end_element_handler |
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| 147 | |
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| 148 | subroutine pcdata_chunk_handler(chunk) |
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| 149 | character(len=*), intent(in) :: chunk |
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| 150 | end subroutine pcdata_chunk_handler |
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| 151 | |
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| 152 | subroutine comment_handler(comment) |
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| 153 | character(len=*), intent(in) :: comment |
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| 154 | end subroutine comment_handler |
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| 155 | |
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| 156 | subroutine xml_declaration_handler(name,attributes) |
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| 157 | use m_dictionary |
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| 158 | character(len=*), intent(in) :: name |
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| 159 | type(dictionary_t), intent(in) :: attributes |
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| 160 | end subroutine xml_declaration_handler |
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| 161 | |
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| 162 | subroutine sgml_declaration_handler(sgml_declaration) |
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| 163 | character(len=*), intent(in) :: sgml_declaration |
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| 164 | end subroutine sgml_declaration_handler |
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| 165 | |
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| 166 | subroutine cdata_section_handler(cdata) |
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| 167 | character(len=*), intent(in) :: cdata |
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| 168 | end subroutine cdata_section_handler |
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| 169 | |
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| 170 | subroutine error_handler(error_info) |
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| 171 | use m_xml_error |
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| 172 | type(xml_error_t), intent(in) :: error_info |
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| 173 | end subroutine error_handler |
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| 174 | |
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| 175 | subroutine signal_handler(code) |
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| 176 | logical, intent(out) :: code |
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| 177 | end subroutine signal_handler |
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| 178 | |
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| 179 | subroutine empty_element_handler(name,attributes) |
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| 180 | use m_dictionary |
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| 181 | character(len=*), intent(in) :: name |
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| 182 | type(dictionary_t), intent(in) :: attributes |
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| 183 | end subroutine empty_element_handler |
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| 184 | |
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| 185 | end interface |
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| 186 | |
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| 187 | character(len=1) :: c |
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| 188 | integer :: iostat, status |
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| 189 | |
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| 190 | character(len=150) :: message |
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| 191 | integer :: signal |
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| 192 | |
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| 193 | type(buffer_t) :: translated_pcdata |
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| 194 | type(buffer_t) :: name, oldname, dummy |
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| 195 | |
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| 196 | logical :: have_begin_handler, have_end_handler, & |
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| 197 | have_pcdata_handler, have_comment_handler, & |
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| 198 | have_xml_declaration_handler, & |
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| 199 | have_sgml_declaration_handler, & |
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| 200 | have_cdata_section_handler, have_empty_handler, & |
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| 201 | have_error_handler, have_signal_handler |
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| 202 | |
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| 203 | logical :: pause_signal |
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| 204 | |
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| 205 | type(xml_error_t) :: error_info |
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| 206 | type(file_buffer_t), pointer :: fb |
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| 207 | type(fsm_t), pointer :: fx |
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| 208 | |
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| 209 | have_begin_handler = present(begin_element_handler) |
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| 210 | have_end_handler = present(end_element_handler) |
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| 211 | have_pcdata_handler = present(pcdata_chunk_handler) |
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| 212 | have_comment_handler = present(comment_handler) |
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| 213 | have_xml_declaration_handler = present(xml_declaration_handler) |
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| 214 | have_sgml_declaration_handler = present(sgml_declaration_handler) |
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| 215 | have_cdata_section_handler = present(cdata_section_handler) |
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| 216 | have_error_handler = present(error_handler) |
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| 217 | have_signal_handler = present(signal_handler) |
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| 218 | have_empty_handler = present(empty_element_handler) |
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| 219 | |
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| 220 | fb => fxml%fb |
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| 221 | fx => fxml%fx |
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| 222 | if (present(verbose)) then |
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| 223 | debug = verbose ! For m_converters |
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| 224 | fx%debug = verbose ! job-specific flag |
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| 225 | endif |
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| 226 | |
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| 227 | if (fx%debug) print *, " Entering xml_parse..." |
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| 228 | |
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| 229 | !--------------------------------------------------------------------- |
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| 230 | do |
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| 231 | call get_character(fb,c,iostat) |
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| 232 | |
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| 233 | if (iostat /= 0) then ! End of file... |
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| 234 | if (.not. is_empty(fx%element_stack)) then |
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| 235 | call build_error_info(error_info, & |
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| 236 | "Early end of file.", & |
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| 237 | line(fb),column(fb),fx%element_stack,SEVERE_ERROR_CODE) |
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| 238 | if (have_error_handler) then |
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| 239 | call error_handler(error_info) |
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| 240 | else |
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| 241 | call default_error_handler(error_info) |
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| 242 | endif |
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| 243 | endif |
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| 244 | call endfile_xmlfile(fxml) ! Mark it as eof |
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| 245 | EXIT |
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| 246 | endif |
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| 247 | |
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| 248 | call evolve_fsm(fx,c,signal) |
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| 249 | |
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| 250 | if (fx%debug) print *, c, " ::: ", trim(fx%action) |
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| 251 | |
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| 252 | if (signal == END_OF_TAG) then |
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| 253 | ! |
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| 254 | ! We decide whether we have ended an opening tag or a closing tag |
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| 255 | ! |
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| 256 | if (fx%context == OPENING_TAG) then |
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| 257 | name = fx%element_name |
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| 258 | |
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| 259 | if (fx%debug) print *, "We have found an opening tag" |
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| 260 | if (fx%root_element_seen) then |
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| 261 | if (name .equal. fx%root_element_name) then |
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| 262 | call build_error_info(error_info, & |
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| 263 | "Duplicate root element: " // str(name), & |
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| 264 | line(fb),column(fb),fx%element_stack,SEVERE_ERROR_CODE) |
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| 265 | if (have_error_handler) then |
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| 266 | call error_handler(error_info) |
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| 267 | else |
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| 268 | call default_error_handler(error_info) |
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| 269 | endif |
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| 270 | endif |
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| 271 | if (is_empty(fx%element_stack)) then |
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| 272 | call build_error_info(error_info, & |
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| 273 | "Opening tag beyond root context: " // str(name), & |
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| 274 | line(fb),column(fb),fx%element_stack,SEVERE_ERROR_CODE) |
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| 275 | if (have_error_handler) then |
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| 276 | call error_handler(error_info) |
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| 277 | else |
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| 278 | call default_error_handler(error_info) |
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| 279 | endif |
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| 280 | endif |
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| 281 | else |
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| 282 | fx%root_element_name = name |
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| 283 | fx%root_element_seen = .true. |
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| 284 | endif |
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| 285 | call push_elstack(name,fx%element_stack) |
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| 286 | if (have_begin_handler) & |
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| 287 | call begin_element_handler(str(name),fx%attributes) |
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| 288 | |
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| 289 | else if (fx%context == CLOSING_TAG) then |
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| 290 | name = fx%element_name |
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| 291 | |
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| 292 | if (fx%debug) print *, "We have found a closing tag" |
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| 293 | if (is_empty(fx%element_stack)) then |
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| 294 | call build_error_info(error_info, & |
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| 295 | "Nesting error: End tag: " // str(name) // & |
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| 296 | " does not match -- too many end tags", & |
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| 297 | line(fb),column(fb),fx%element_stack,SEVERE_ERROR_CODE) |
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| 298 | if (have_error_handler) then |
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| 299 | call error_handler(error_info) |
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| 300 | else |
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| 301 | call default_error_handler(error_info) |
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| 302 | endif |
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| 303 | else |
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| 304 | call get_top_elstack(fx%element_stack,oldname) |
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| 305 | if (oldname .equal. name) then |
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| 306 | call pop_elstack(fx%element_stack,oldname) |
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| 307 | if (have_end_handler) call end_element_handler(str(name)) |
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| 308 | !! call pop_elstack(fx%element_stack,oldname) |
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| 309 | else |
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| 310 | call build_error_info(error_info, & |
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| 311 | "Nesting error: End tag: " // str(name) // & |
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| 312 | ". Expecting end of : " // str(oldname), & |
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| 313 | line(fb),column(fb),fx%element_stack,SEVERE_ERROR_CODE) |
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| 314 | if (have_error_handler) then |
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| 315 | call error_handler(error_info) |
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| 316 | else |
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| 317 | call default_error_handler(error_info) |
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| 318 | endif |
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| 319 | endif |
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| 320 | endif |
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| 321 | else if (fx%context == SINGLE_TAG) then |
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| 322 | name = fx%element_name |
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| 323 | |
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| 324 | if (fx%debug) print *, "We have found a single (empty) tag: ", & |
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| 325 | char(name) |
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| 326 | ! |
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| 327 | ! Push name on to stack to reveal true xpath |
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| 328 | ! |
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| 329 | call push_elstack(name,fx%element_stack) |
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| 330 | if (have_empty_handler) then |
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| 331 | if (fx%debug) print *, "--> calling empty_element_handler." |
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| 332 | call empty_element_handler(str(name),fx%attributes) |
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| 333 | call pop_elstack(fx%element_stack,dummy) |
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| 334 | else |
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| 335 | if (have_begin_handler) then |
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| 336 | if (fx%debug) print *, "--> calling begin_element_handler..." |
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| 337 | call begin_element_handler(str(name),fx%attributes) |
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| 338 | endif |
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| 339 | call pop_elstack(fx%element_stack,dummy) |
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| 340 | if (have_end_handler) then |
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| 341 | if (fx%debug) print *, "--> ... and end_element_handler." |
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| 342 | call end_element_handler(str(name)) |
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| 343 | endif |
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| 344 | endif |
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| 345 | !! call pop_elstack(fx%element_stack,dummy) |
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| 346 | |
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| 347 | else if (fx%context == CDATA_SECTION_TAG) then |
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| 348 | |
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| 349 | if (fx%debug) print *, "We found a CDATA section" |
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| 350 | if (is_empty(fx%element_stack)) then |
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| 351 | if (fx%debug) print *, & |
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| 352 | "... Warning: CDATA section outside element context" |
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| 353 | else |
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| 354 | if (have_cdata_section_handler) then |
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| 355 | call cdata_section_handler(str(fx%pcdata)) |
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| 356 | else |
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| 357 | if (have_pcdata_handler) & |
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| 358 | call pcdata_chunk_handler(str(fx%pcdata)) |
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| 359 | endif |
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| 360 | endif |
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| 361 | |
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| 362 | else if (fx%context == COMMENT_TAG) then |
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| 363 | |
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| 364 | if (fx%debug) print *, "We found a comment tag" |
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| 365 | if (have_comment_handler) & |
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| 366 | call comment_handler(str(fx%pcdata)) |
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| 367 | |
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| 368 | else if (fx%context == SGML_DECLARATION_TAG) then |
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| 369 | |
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| 370 | if (fx%debug) print *, "We found an sgml declaration" |
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| 371 | if (have_sgml_declaration_handler) & |
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| 372 | call sgml_declaration_handler(str(fx%pcdata)) |
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| 373 | |
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| 374 | else if (fx%context == XML_DECLARATION_TAG) then |
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| 375 | |
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| 376 | if (fx%debug) print *, "We found an XML declaration" |
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| 377 | name = fx%element_name |
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| 378 | if (have_xml_declaration_handler) & |
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| 379 | call xml_declaration_handler(str(name),fx%attributes) |
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| 380 | |
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| 381 | else |
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| 382 | |
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| 383 | ! do nothing |
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| 384 | |
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| 385 | endif |
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| 386 | |
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| 387 | else if (signal == CHUNK_OF_PCDATA) then |
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| 388 | |
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| 389 | if (fx%debug) print *, "We found a chunk of PCDATA" |
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| 390 | if (is_empty(fx%element_stack)) then |
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| 391 | if (fx%debug) print *, "... Warning: PCDATA outside element context" |
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| 392 | ! Just a warning |
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| 393 | call build_error_info(error_info, & |
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| 394 | "PCDATA outside of element context", & |
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| 395 | line(fb),column(fb),fx%element_stack,WARNING_CODE) |
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| 396 | if (have_error_handler) then |
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| 397 | call error_handler(error_info) |
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| 398 | else |
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| 399 | call default_error_handler(error_info) |
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| 400 | endif |
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| 401 | else |
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| 402 | ! |
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| 403 | ! Replace entities by their value |
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| 404 | ! |
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| 405 | call entity_filter(fx%pcdata,translated_pcdata,status,message) |
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| 406 | if (status < 0) then |
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| 407 | call build_error_info(error_info, message, & |
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| 408 | line(fb),-status,fx%element_stack,SEVERE_ERROR_CODE) |
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| 409 | if (have_error_handler) then |
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| 410 | call error_handler(error_info) |
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| 411 | else |
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| 412 | call default_error_handler(error_info) |
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| 413 | endif |
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| 414 | else if (status > 0) then |
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| 415 | ! Just a warning |
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| 416 | call build_error_info(error_info, message, & |
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| 417 | line(fb),status,fx%element_stack,WARNING_CODE) |
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| 418 | if (have_error_handler) then |
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| 419 | call error_handler(error_info) |
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| 420 | else |
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| 421 | call default_error_handler(error_info) |
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| 422 | endif |
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| 423 | else |
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| 424 | if (have_pcdata_handler) & |
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| 425 | call pcdata_chunk_handler(str(translated_pcdata)) |
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| 426 | endif |
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| 427 | endif |
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| 428 | |
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| 429 | else if (signal == EXCEPTION) then |
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| 430 | call build_error_info(error_info, fx%action, & |
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| 431 | line(fb),column(fb),fx%element_stack,SEVERE_ERROR_CODE) |
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| 432 | if (have_error_handler) then |
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| 433 | call error_handler(error_info) |
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| 434 | else |
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| 435 | call default_error_handler(error_info) |
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| 436 | endif |
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| 437 | else |
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| 438 | ! QUIET, do nothing |
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| 439 | endif |
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| 440 | if (signal /= QUIET) then |
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| 441 | if (have_signal_handler) then |
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| 442 | call signal_handler(pause_signal) |
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| 443 | if (pause_signal) exit |
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| 444 | endif |
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| 445 | endif |
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| 446 | |
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| 447 | enddo |
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| 448 | |
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| 449 | end subroutine xml_parse |
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| 450 | |
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| 451 | !----------------------------------------- |
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| 452 | subroutine xml_path(fxml,path) |
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| 453 | type(xml_t), intent(in) :: fxml |
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| 454 | character(len=*), intent(out) :: path |
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| 455 | |
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| 456 | call get_elstack_signature(fxml%fx%element_stack,path) |
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| 457 | |
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| 458 | end subroutine xml_path |
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| 459 | |
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| 460 | !----------------------------------------- |
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| 461 | subroutine xml_mark_path(fxml,path) |
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| 462 | ! |
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| 463 | ! Marks the current path |
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| 464 | ! |
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| 465 | type(xml_t), intent(inout) :: fxml |
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| 466 | character(len=*), intent(out) :: path |
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| 467 | |
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| 468 | call get_elstack_signature(fxml%fx%element_stack,fxml%path_mark) |
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| 469 | path = fxml%path_mark |
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| 470 | |
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| 471 | end subroutine xml_mark_path |
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| 472 | |
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| 473 | !----------------------------------------- |
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| 474 | subroutine xml_get_path_mark(fxml,path) |
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| 475 | ! |
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| 476 | ! Returns the currently markd path (or an empty string if there are no marks) |
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| 477 | ! |
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| 478 | type(xml_t), intent(in) :: fxml |
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| 479 | character(len=*), intent(out) :: path |
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| 480 | |
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| 481 | path = fxml%path_mark |
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| 482 | |
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| 483 | end subroutine xml_get_path_mark |
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| 484 | |
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| 485 | !----------------------------------------- |
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| 486 | subroutine xml_name(fxml,name) |
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| 487 | type(xml_t), intent(in) :: fxml |
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| 488 | character(len=*), intent(out) :: name |
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| 489 | |
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| 490 | name = char(fxml%fx%element_name) |
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| 491 | |
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| 492 | end subroutine xml_name |
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| 493 | !----------------------------------------- |
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| 494 | subroutine xml_attributes(fxml,attributes) |
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| 495 | type(xml_t), intent(in) :: fxml |
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| 496 | type(dictionary_t), intent(out) :: attributes |
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| 497 | |
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| 498 | attributes = fxml%fx%attributes |
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| 499 | |
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| 500 | end subroutine xml_attributes |
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| 501 | |
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| 502 | end module m_xml_parser |
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| 503 | |
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| 504 | |
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| 505 | |
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| 506 | |
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