annotate src/bbcode/Bbcode.luan @ 44:96f0c3d65698

add /bbcode
author Franklin Schmidt <fschmidt@gmail.com>
date Thu, 10 Nov 2022 23:18:58 -0700
parents src/lib/Bbcode.luan@298c71e0c854
children 2d4f00755092
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1 local Luan = require "luan:Luan.luan"
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2 local error = Luan.error
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3 local type = Luan.type or error()
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4 local ipairs = Luan.ipairs or error()
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5 local pairs = Luan.pairs or error()
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6 local stringify = Luan.stringify or error()
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7 local Io = require "luan:Io.luan"
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8 local output_of = Io.output_of or error()
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9 local Parsers = require "luan:Parsers.luan"
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10 local bbcode_parse = Parsers.bbcode_parse or error()
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11 local Html = require "luan:Html.luan"
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12 local html_encode = Html.encode or error()
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13 local html_parse = Html.parse or error()
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14 local Table = require "luan:Table.luan"
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15 local is_list = Table.is_list or error()
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16 local concat = Table.concat or error()
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17 local String = require "luan:String.luan"
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18 local regex = String.regex or error()
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19 local ends_with = String.ends_with or error()
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20 local User = require "site:/lib/User.luan"
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21 local Shared = require "site:/lib/Shared.luan"
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22 local list_to_set = Shared.list_to_set or error()
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23 local to_list = Shared.to_list or error()
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24 local Logging = require "luan:logging/Logging.luan"
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25 local logger = Logging.logger "Bbcode"
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28 local Bbcode = {}
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30 local starting_cr_regex = regex[[^\n]]
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31
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32 local to_html
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33 local html = {}
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35 function html.b(bbcode,options)
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36 %><b><% to_html(bbcode.contents,options) %></b><%
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37 end
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39 function html.i(bbcode,options)
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40 %><i><% to_html(bbcode.contents,options) %></i><%
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41 end
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43 function html.u(bbcode,options)
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44 %><u><% to_html(bbcode.contents,options) %></u><%
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45 end
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47 function html.s(bbcode,options)
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48 %><s><% to_html(bbcode.contents,options) %></s><%
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49 end
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51 function html.sup(bbcode,options)
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52 %><sup><% to_html(bbcode.contents,options) %></sup><%
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53 end
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55 function html.brackets(bbcode,options)
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56 %>[<% to_html(bbcode.contents,options) %>]<%
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57 end
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59 function html.url(bbcode,options)
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60 local url = bbcode.param
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61 if url == nil then
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62 url = html_encode(bbcode.contents)
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63 %><a href="<%=url%>"><%=url%></a><%
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64 else
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65 url = html_encode(url)
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66 %><a href="<%=url%>"><% to_html(bbcode.contents,options) %></a><%
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67 end
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68 end
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69
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70 function html.code(bbcode,options)
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71 local s = starting_cr_regex.gsub(bbcode.contents,"")
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72 %><code><%= html_encode(s) %></code><%
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73 options.strip_newline = true
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74 end
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75
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76 function html.img(bbcode,options)
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77 %><img src="<%= html_encode(bbcode.contents) %>"><%
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78 end
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79
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80 function html.color(bbcode,options)
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81 %><span style="color:<%=bbcode.param%>"><% to_html(bbcode.contents,options) %></span><%
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82 end
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83
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84 function html.size(bbcode,options)
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85 %><span style="font-size:<%=bbcode.param%>"><% to_html(bbcode.contents,options) %></span><%
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86 end
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87
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88 function html.quote(bbcode,options)
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89 %><blockquote><%
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90 local user_name = bbcode.param
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91 if user_name ~= nil then
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92 local user = User.get_by_name(user_name)
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93 if user == nil then
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94 %><%= user_name %> wrote:<%
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95 else
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96 %><a href="/user_something"><%= user_name %></a> wrote:<%
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97 end
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98 else
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99 options.strip_newline = true
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100 end
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101 to_html(bbcode.contents,options)
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102 %></blockquote><%
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103 options.strip_newline = true
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104 end
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105
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106 local function video_iframe(url)
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107 %><iframe width="560" height="315" frameborder="0" allowfullscreen src="<%=url%>"></iframe><%
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108 end
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109
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110 local video_handlers = {}
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111 do
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112 local ptn1 = regex[[^\Qhttps://youtu.be/\E([a-zA-Z0-9_-]+)(?:\?t=([0-9]+))?]]
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113 local ptn2 = regex[[^\Qhttps://www.youtube.com/watch?v=\E([a-zA-Z0-9_-]+)(?:&t=([0-9]+)s)?]]
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114 function video_handlers.youtube(url)
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115 local id, start = ptn1.match(url)
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116 if id == nil then
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117 id, start = ptn2.match(url)
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118 end
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119 if id == nil then
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120 return false
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121 end
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122 url = "https://www.youtube.com/embed/"..id
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123 if start ~= nil then
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124 url = url.."?start="..start
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125 end
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126 video_iframe(url)
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127 return true
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128 end
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129 end
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130 do
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131 local ptn = regex[[^\Qhttps://rumble.com/embed/\E[a-z0-9]+/\?pub=[a-z0-9]+]]
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132 function video_handlers.rumble(url)
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133 if not ptn.matches(url) then
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134 return false
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135 end
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136 video_iframe(url)
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137 return true
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138 end
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139 end
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140 do
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141 local ptn = regex[[^\Qhttps://www.bitchute.com/video/\E([a-zA-Z0-9]+)/]]
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142 function video_handlers.bitchute(url)
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143 local id = ptn.match(url)
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144 if id == nil then
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145 return false
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146 end
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147 url = "https://www.bitchute.com/embed/"..id.."/"
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148 video_iframe(url)
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149 return true
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150 end
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151 end
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152 do
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153 local ptn = regex[[^\Qhttps://vimeo.com/\E([0-9]+)]]
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154 function video_handlers.vimeo(url)
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155 local id = ptn.match(url)
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156 if id == nil then
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157 return false
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158 end
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159 url = "https://player.vimeo.com/video/"..id
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160 video_iframe(url)
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161 return true
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162 end
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163 end
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164 do
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165 local ptn = regex[[^\Qhttps://dai.ly/\E([a-z0-9]+)]]
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166 function video_handlers.dailymotion(url)
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167 local id = ptn.match(url)
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168 if id == nil then
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169 return false
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170 end
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171 url = "https://www.dailymotion.com/embed/video/"..id
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172 video_iframe(url)
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173 return true
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174 end
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175 end
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176 do
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177 local ptn = regex[[^\Qhttps://www.tiktok.com/\E[^/]+/video/([0-9]+)]]
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178 function video_handlers.tiktok(url)
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179 local id = ptn.match(url)
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180 if id == nil then
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181 return false
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182 end
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183 %><blockquote class="tiktok-embed" data-video-id="<%=id%>" style="max-width: 560px; margin-left: 0;"><section></section></blockquote><%
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184 %><script async src="https://www.tiktok.com/embed.js"></script><%
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185 return true
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186 end
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187 end
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188 do
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189 local ptn = regex[[\.[a-zA-Z0-9]+$]]
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190 function video_handlers.file(url)
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191 if not ptn.matches(url) then
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192 return false
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193 end
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194 %><video controls width="560"><source src="<%=html_encode(url)%>"></video><%
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195 return true
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196 end
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197 end
23
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198
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199 function html.video(bbcode,options)
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200 local url = bbcode.contents
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201 for _, handle in pairs(video_handlers) do
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202 if handle(url) then return end
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6871eec2cf4c add rumble
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203 end
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204 url = html_encode(url)
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205 %><a href="<%=url%>"><%=url%></a><%
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206 end
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207
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208 local function list_to_html(bbcode,options)
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209 local list = to_list(bbcode.contents)
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210 for _, item in ipairs(list) do
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211 if type(item) == "table" and item.name == "li" then
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212 %><li><% to_html(item.contents,options) %></li><%
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213 end
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214 end
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215 options.strip_newline = true
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216 end
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217
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218 function html.ul(bbcode,options)
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219 %><ul><%
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220 list_to_html(bbcode,options)
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221 %></ul><%
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222 end
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223
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224 function html.ol(bbcode,options)
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225 %><ol><%
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226 list_to_html(bbcode,options)
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227 %></ol><%
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228 end
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229
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230 function to_html(bbcode,options)
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231 if options.strip_newline then
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232 if type(bbcode) == "string" then
29
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233 bbcode = starting_cr_regex.gsub(bbcode,"")
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234 end
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235 options.strip_newline = false
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236 end
12
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237 if type(bbcode) == "string" then
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238 %><%= html_encode(bbcode) %><%
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239 else
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240 type(bbcode) == "table" or error()
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241 if is_list(bbcode) then
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242 for _, v in ipairs(bbcode) do
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243 to_html(v,options)
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244 end
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245 else
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246 local fn = html[bbcode.name] or error(bbcode.name.." not handled")
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247 fn(bbcode,options)
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248 end
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249 end
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250 end
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251
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252 function Bbcode.to_html(bbcode)
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253 bbcode = bbcode_parse(bbcode)
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254 %><div message><%
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255 to_html(bbcode,{strip_newline=false})
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256 %></div><%
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257 end
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258
13
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259
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260 local doesnt_nest = list_to_set{
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261 "url"
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262 "code"
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263 "img"
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264 "video"
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265 }
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266
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267 local url_regex = regex[[(^|\s)(https?://\S+)]]
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268
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269 local function preprocess(bbcode)
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270 if type(bbcode) == "string" then
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271 bbcode = url_regex.gsub( bbcode, "$1[url]$2[/url]" )
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272 %><%= bbcode %><%
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273 else
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274 type(bbcode) == "table" or error()
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275 if is_list(bbcode) then
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276 for _, v in ipairs(bbcode) do
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277 preprocess(v)
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278 end
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279 else
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280 local name = bbcode.name
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281 local param = bbcode.param
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282 %>[<%=name%><%
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283 if param ~= nil then
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284 %>=<%=param%><%
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285 end
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286 %>]<%
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287 if doesnt_nest[name] then
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288 %><%=bbcode.contents%><%
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289 else
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290 preprocess(bbcode.contents)
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291 end
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diff changeset
292 if name == "code" and param ~= nil then
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293 %>[/<%=name%>=<%=param%>]<%
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294 else
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295 %>[/<%=name%>]<%
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296 end
13
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297 end
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298 end
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299 end
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300
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diff changeset
301 -- url handling
13
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diff changeset
302 function Bbcode.preprocess(bbcode)
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303 bbcode = bbcode_parse(bbcode)
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304 return output_of(function()
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305 preprocess(bbcode)
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306 end)
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307 end
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diff changeset
308
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diff changeset
309 function Bbcode.remove_html(text)
29
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diff changeset
310 local ends_with_newline = ends_with(text,"\n")
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diff changeset
311 local t = {}
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312 local html = html_parse(text)
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313 local is_first = true
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314 for _, v in ipairs(html) do
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315 if type(v) == "string" then
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316 t[#t+1] = v
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317 else
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318 local name = v.name
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319 if name == "div" then
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320 if not is_first then
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321 t[#t+1] = "\n"
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322 end
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323 elseif name == "/div" or name == "br" then
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324 -- ignore
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325 else
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diff changeset
326 error("unexpected tag: "..name)
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327 end
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328 end
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329 is_first = false
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330 end
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331 if not ends_with_newline then
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diff changeset
332 t[#t+1] = "\n"
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333 end
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diff changeset
334 return concat(t)
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diff changeset
335 end
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diff changeset
336
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diff changeset
337
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338 return Bbcode