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templating redesign
author Richard Jones <richard@users.sourceforge.net>
date Tue, 20 Aug 2002 04:35:19 +0000
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children 846f2a79807d
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1 ==========================
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2 HTML Templating Mechanisms
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3 ==========================
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4
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5 :Version: $Revision: 1.1 $
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6
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7 Current Situation and Issues
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8 ============================
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9
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10 Syntax
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11 ------
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12
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13 Roundup currently uses an element-based HTML-tag-alike templating syntax::
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14
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15 <display call="checklist('status')">
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16
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17 The templates were initially parsed using recursive regular expression
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18 parsing, and since no template tag could be encapsulate itself, the parser
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19 worked just fine. Then we got the ``<require>`` tag, which could have other
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20 ``<require>`` tags inside. This forced us to move towards a more complete
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21 parser, using the standard python sgmllib/htmllib parser. The downside of this
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22 switch is that constructs of the form::
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23
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24 <tr class="row-<display call="plain('status')">">
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25
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26 don't parse as we'd hope. It would be almost impossible to modify the sgmllib
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27 parser to parse the above "correctly", so a wholly new parser would be
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28 required. That is a large undertaking, and doesn't address another couple of
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29 issues that have arisen:
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30
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31 1. the template syntax is neither HTML-editor friendly, not a well-formed
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32 syntax for other tools to work with, and
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33 2. user requirements generally have to be anticipated and accounted for in
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34 templating functions (like ``plain()`` and ``checklist()`` above), and
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35 we are therefore artificially restrictive.
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36
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37 Arguments for switching templating systems:
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38
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39 *Pros*
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40
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41 - we can be editor-friendly
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42 - more flexibility in templating control and content
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43
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44 *Cons*
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45
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46 - installed user base (though they'd have to edit their templates with the
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47 next release anyway)
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48 - current templating system is pretty trivial, and a more flexible system
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49 is likely to be more complex
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50
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51
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52 Templates
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53 ---------
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54
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55 We should also take this opportunity to open up the fexibility of the
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56 templates through:
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57
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58 1. allowing the instance to define a "page" template, which holds the overall
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59 page structure, including header and footer
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60
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61
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62
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63 Possible approaches
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64 ===================
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65
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66 Zope's PageTemplates
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67 --------------------
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68
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69 Using Zope's PageTemplates seems to be the best approach of the lot.
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70 In my opinion, it's the peak of HTML templating technology at present. With
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71 appropriate infrastructure, the above two examples would read:
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72
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73 <span tal:replace="item/status/checklist">status checklist</span>
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74
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75 <tr tal:attributes="class string:row-${item/status/name}">
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76
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77 ... which doesn't look that much more complicated... honest...
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78
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79 Other fun can be had when you start playing with stuff like:
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80
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81 <table>
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82 <tr tal:repeat="message item/msg/list">
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83 <td tal:define="from message/from">
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84 <a href="" tal:attributes="href string:mailto:${from/address}"
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85 tal:content="from/name">mailto link</a>
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86 </td>
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87 <td tal:content="message/title">subject</td>
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88 <td tal:content="message/created">received date</td>
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89 </tr>
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90 </table>
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91
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92
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93 Implementation
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94 ~~~~~~~~~~~~~~
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95
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96 I'm envisaging an infrastructure layer where each template has the following
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97 variables defined:
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98
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99 *class*
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100 the current class of node being displayed
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101 *item*
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102 the current node from the database, if we're viewing a specific node
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103 (*classname*)
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104 the current node is also available under its classname, so a *user* node
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105 would also be available under the name *user*.
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106 *form*
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107 the current CGI form information
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108 *instance*
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109 the current instance
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110 *db*
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111 the current open database
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112 *config*
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113 the current instance config
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114 *util*
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115 utility methods
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116
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117 Then accesses through an *item*::
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118
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119 class HTMLItem:
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120 def __getattr__(self, attr):
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121 ''' return an HTMLItem instance '''
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122 def history(self, ...)
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123 def classhelp(self, ...)
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124 def remove(self, ...)
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125
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126 String, Number, Date, Interval HTMLProperty
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127 a wrapper object which may be stringified for the current plain() behaviour
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128 and has methods emulating all the current display functions, so
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129 ``item/name/plain`` would emulate the current ``call="plain()``". Also,
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130 ``python:item.name.plain(name=value)`` would work just fine::
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131
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132 class HTMLProperty:
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133 def __init__(self, instance, db, ...)
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134 def __str__(self):
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135 return self.plain()
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136
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137 class StringHTMLProperty(HTLProperty):
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138 def plain(self, ...)
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139 def field(self, ...)
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140 def stext(self, ...)
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141 def multiline(self, ...)
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142 def email(self, ...)
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143
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144 class NumberHTMLProperty(HTMLProperty):
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145 def plain(self, ...)
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146 def field(self, ...)
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147
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148 class BooleanHTMLProperty(HTMLProperty):
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149 def plain(self, ...)
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150 def field(self, ...)
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151
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152 class DateHTMLProperty(HTMLProperty):
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153 def plain(self, ...)
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154 def field(self, ...)
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155 def reldate(self, ...)
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156
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157 class IntervalHTMLProperty(HTMLProperty):
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158 def plain(self, ...)
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159 def field(self, ...)
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160
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161 Link HTMLProperty
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162 the wrapper object would include the above as well as being able to access
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163 the class information. Stringifying the object itself would result in the
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164 value from the item being displayed. Accessing attributes of this object
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165 would result in the appropriate entry from the class being queried for the
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166 property accessed (so item/assignedto/name would look up the user entry
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167 identified by the assignedto property on item, and then the name property of
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168 that user)::
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169
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170 class LinkHTMLProperty(HTMLProperty):
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171 ''' Be a HTMLItem too '''
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172 def __getattr__(self, attr):
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173 ''' return a new HTMLProperty '''
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174 def download(self, ...)
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175 def checklist(self, ...)
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176
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177 Multilink HTMLProperty
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178 the wrapper would also be iterable, returning a wrapper object like the Link
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179 case for each entry in the multilink::
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180
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181 class MultilinkHTMLProperty(HTMLProperty):
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182 def __len__(self):
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183 ''' length of the multilink '''
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184 def __getitem(self, num):
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185 ''' return a new HTMLItem '''
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186 def checklist(self, ...)
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187 def list(self, ...)
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188
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189 *util*
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190 the util object will handle::
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191
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192 class Util:
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193 def __init__(self, ...)
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194 def filterspec(self, ...)
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195 def note(self, ...)
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196 def submit(self, ...)
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197
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198 Action
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199 ======
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200
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201 1. Investigate how PageTemplates would be integrated into Roundup:
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202
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203 - we could go for a fully-divorced-from-Zope approach, which would involve
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204 bundling PageTemplates/TAL/ZTUtils in with Roundup, with all the
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205 Zope-specific bits removed.
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206 - we could try to coexist with a Zope installation, but there the problem
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207 would be that Zope includes its own copy of PageTemplates/TAL/ZTUtils and
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208 we'd be installing a version in site-packages, which would be bad.
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209
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210 The latter may allow nicer integration with Zope itself, giving Zope
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211 Roundup users access to acquired information in their templates.
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212
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213 2. Implement the Roundup infrastructure detailed in the `implementation`_ above.
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214
Roundup Issue Tracker: http://roundup-tracker.org/