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January 11, 2016 10:44
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Learn more about bidirectional Unicode charactersOriginal file line number Diff line number Diff line change @@ -0,0 +1,157 @@ /** * Special thanks to http://webcheatsheet.com/php/reading_the_clean_text_from_rtf.php */ <?php // Function that checks whether the data are the on-screen text. // It works in the following way: // an array arrfailAt stores the control words for the current state of the stack, which show that // input data are something else than plain text. // For example, there may be a description of font or color palette etc. function rtf_isPlainText($s) { $arrfailAt = array("*", "fonttbl", "colortbl", "datastore", "themedata"); for ($i = 0; $i < count($arrfailAt); $i++) if (!empty($s[$arrfailAt[$i]])) return false; return true; } function rtf2text($filename) { // Read the data from the input file. $text = file_get_contents($filename); if (!strlen($text)) return ""; // Create empty stack array. $document = ""; $stack = array(); $j = -1; // Read the data character-by- character… for ($i = 0, $len = strlen($text); $i < $len; $i++) { $c = $text[$i]; // Depending on current character select the further actions. switch ($c) { // the most important key word backslash case "\\": // read next character $nc = $text[$i + 1]; // If it is another backslash or nonbreaking space or hyphen, // then the character is plain text and add it to the output stream. if ($nc == '\\' && rtf_isPlainText($stack[$j])) $document .= '\\'; elseif ($nc == '~' && rtf_isPlainText($stack[$j])) $document .= ' '; elseif ($nc == '_' && rtf_isPlainText($stack[$j])) $document .= '-'; // If it is an asterisk mark, add it to the stack. elseif ($nc == '*') $stack[$j]["*"] = true; // If it is a single quote, read next two characters that are the hexadecimal notation // of a character we should add to the output stream. elseif ($nc == "'") { $hex = substr($text, $i + 2, 2); if (rtf_isPlainText($stack[$j])) $document .= html_entity_decode("&#".hexdec($hex).";"); //Shift the pointer. $i += 2; // Since, we’ve found the alphabetic character, the next characters are control word // and, possibly, some digit parameter. } elseif ($nc >= 'a' && $nc <= 'z' || $nc >= 'A' && $nc <= 'Z') { $word = ""; $param = null; // Start reading characters after the backslash. for ($k = $i + 1, $m = 0; $k < strlen($text); $k++, $m++) { $nc = $text[$k]; // If the current character is a letter and there were no digits before it, // then we’re still reading the control word. If there were digits, we should stop // since we reach the end of the control word. if ($nc >= 'a' && $nc <= 'z' || $nc >= 'A' && $nc <= 'Z') { if (empty($param)) $word .= $nc; else break; // If it is a digit, store the parameter. } elseif ($nc >= '0' && $nc <= '9') $param .= $nc; // Since minus sign may occur only before a digit parameter, check whether // $param is empty. Otherwise, we reach the end of the control word. elseif ($nc == '-') { if (empty($param)) $param .= $nc; else break; } else break; } // Shift the pointer on the number of read characters. $i += $m - 1; // Start analyzing what we’ve read. We are interested mostly in control words. $toText = ""; switch (strtolower($word)) { // If the control word is "u", then its parameter is the decimal notation of the // Unicode character that should be added to the output stream. // We need to check whether the stack contains \ucN control word. If it does, // we should remove the N characters from the output stream. case "u": $toText .= html_entity_decode("&#x".dechex($param).";"); $ucDelta = @$stack[$j]["uc"]; if ($ucDelta > 0) $i += $ucDelta; break; // Select line feeds, spaces and tabs. case "par": case "page": case "column": case "line": case "lbr": $toText .= "\n"; break; case "emspace": case "enspace": case "qmspace": $toText .= " "; break; case "tab": $toText .= "\t"; break; // Add current date and time instead of corresponding labels. case "chdate": $toText .= date("m.d.Y"); break; case "chdpl": $toText .= date("l, j F Y"); break; case "chdpa": $toText .= date("D, j M Y"); break; case "chtime": $toText .= date("H:i:s"); break; // Replace some reserved characters to their html analogs. case "emdash": $toText .= html_entity_decode("—"); break; case "endash": $toText .= html_entity_decode("–"); break; case "bullet": $toText .= html_entity_decode("•"); break; case "lquote": $toText .= html_entity_decode("‘"); break; case "rquote": $toText .= html_entity_decode("’"); break; case "ldblquote": $toText .= html_entity_decode("«"); break; case "rdblquote": $toText .= html_entity_decode("»"); break; // Add all other to the control words stack. If a control word // does not include parameters, set ¶m to true. default: $stack[$j][strtolower($word)] = empty($param) ? true : $param; break; } // Add data to the output stream if required. if (rtf_isPlainText($stack[$j])) $document .= $toText; } $i++; break; // If we read the opening brace {, then new subgroup starts and we add // new array stack element and write the data from previous stack element to it. case "{": array_push($stack, $stack[$j++]); break; // If we read the closing brace }, then we reach the end of subgroup and should remove // the last stack element. case "}": array_pop($stack); $j--; break; // Skip “trash”. case '\0': case '\r': case '\f': case '\n': break; // Add other data to the output stream if required. default: if (rtf_isPlainText($stack[$j])) $document .= $c; break; } } // Return result. return $document; } ?>