1 //

     2 // Copyright (c) 2018, Oracle and/or its affiliates. All rights reserved.

     3 // DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

     4 //

     5 // This code is free software; you can redistribute it and/or modify it

     6 // under the terms of the GNU General Public License version 2 only, as

     7 // published by the Free Software Foundation.

     8 //

     9 // This code is distributed in the hope that it will be useful, but WITHOUT

    10 // ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

    11 // FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

    12 // version 2 for more details (a copy is included in the LICENSE file that

    13 // accompanied this code).

    14 //

    15 // You should have received a copy of the GNU General Public License version

    16 // 2 along with this work; if not, write to the Free Software Foundation,

    17 // Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

    18 //

    19 // Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

    20 // or visit www.oracle.com if you need additional information or have any

    21 // questions.

    22 //

    23 

    24 //

    25 // Traverse a tree of pandoc format objects, calling callback on each

    26 // element, and replacing it if callback returns a new object.

    27 //

    28 // Inspired by the walk method in

    29 // https://github.com/jgm/pandocfilters/blob/master/pandocfilters.py

    30 //

    31 function traverse(obj, callback) {

    32     if (Array.isArray(obj)) {

    33         var processed_array = [];

    34         obj.forEach(function(elem) {

    35             if (elem === Object(elem) && elem.t) {

    36                 var replacement = callback(elem.t, elem.c || []);

    37                 if (!replacement) {

    38                     // no replacement object returned, use original

    39                     processed_array.push(traverse(elem, callback));

    40                 } else if (Array.isArray(replacement)) {

    41                     // array of objects returned, splice all elements into array

    42                     replacement.forEach(function(repl_elem) {

    43                         processed_array.push(traverse(repl_elem, callback));

    44                     })

    45                 } else {

    46                     // replacement object given, traverse it

    47                     processed_array.push(traverse(replacement, callback));

    48                 }

    49             } else {

    50                 processed_array.push(traverse(elem, callback));

    51             }

    52         })

    53         return processed_array;

    54     } else if (obj === Object(obj)) {

    55         var processed_obj = {};

    56         Object.keys(obj).forEach(function(key) {

    57             processed_obj[key] = traverse(obj[key], callback);

    58         })

    59         return processed_obj;

    60     } else {

    61         return obj;

    62     }

    63 }

    64 

    65 //

    66 // Helper constructors to create pandoc format objects

    67 //

    68 function Space() {

    69     return { 't': 'Space', 'c': [] };

    70 }

    71 

    72 function Str(value) {

    73     return { 't': 'Str', 'c': value };

    74 }

    75 

    76 function Strong(value) {

    77     return { 't': 'Strong', 'c': value };

    78 }

    79 

    80 function Header(value) {

    81     return { 't': 'Header', 'c': value };

    82 }

    83 

    84 //

    85 // Callback to change all Str texts to upper case

    86 //

    87 function uppercase(type, value) {

    88     if (type === 'Str') {

    89         return Str(value.toUpperCase());

    90     }

    91 }

    92 

    93 //

    94 // Main callback function that performs our man page AST rewrites

    95 //

    96 function manpage_filter(type, value) {

    97     // If it is a header, decrease the heading level by one, and

    98     // if it is a level 1 header, convert it to upper case.

    99     if (type === 'Header') {

   100         value[0] = Math.max(1, value[0] - 1);

   101         if (value[0] == 1) {

   102             return Header(traverse(value, uppercase));

   103         }

   104     }

   105 

   106     // Man pages does not have superscript. We use it for footnotes, so

   107     // enclose in [...] for best representation.

   108     if (type === 'Superscript') {

   109         return [ Str('['), value[0], Str(']') ];

   110     }

   111 

   112     // If it is a link, put the link name in bold. If it is an external

   113     // link, put it in brackets. Otherwise, it is either an internal link

   114     // (like "#next-heading"), or a relative link to another man page

   115     // (like "java.html"), so remove it for man pages.

   116     if (type === 'Link') {

   117         var target = value[2][0];

   118         if (target.match(/^http[s]?:/)) {

   119             return [ Strong(value[1]), Space(), Str('[' + target + ']') ];

   120         } else {

   121             return Strong(value[1]);

   122         }

   123     }

   124 }

   125 

   126 //

   127 // Main function

   128 //

   129 function main() {

   130     var input = "";

   131     while (line = readLine()) {

   132         input = input.concat(line);

   133     }

   134     var json = JSON.parse(input);

   135 

   136     var transformed_json = traverse(json, manpage_filter);

   137 

   138     print(JSON.stringify(transformed_json));

   139 }

   140 

   141 // ... and execute it

   142 main();