annotate pspx.html @ 39:ee19984ba31d draft

Merge in the header-includes branch to the trunk.
author David Barts <n5jrn@me.com>
date Tue, 28 May 2019 20:20:19 -0700
parents 336bc2f622e4
children
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1 <!DOCTYPE html>
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2 <html>
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3 <head>
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4 <meta http-equiv="content-type" content="text/html; charset=UTF-8">
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5 <title>.pspx Template Files</title>
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6 <style type="text/css">
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7 var { font-family: monospace; font-style: normal; }
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8 </style>
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9 </head>
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10 <body>
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11 <h1>.pspx Template Files</h1>
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12 <h2>Introduction</h2>
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13 Files ending in a <var>.pspx</var> extension define both routes and
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14 templates. The files have two parts: a header and a body.<br>
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15 <h2>The Header</h2>
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16 <p>The header is optional and consists of lines starting with an octothorpe
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17 (#) character. With the exception of the <code>#rem </code>header, all
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18 header lines may appear only once in a given file.</p>
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19 <dl>
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20 <dt><code>#end</code></dt>
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21 <dd>Marks the last line of the headers. Since the end of the header lines
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22 is implicitly marked by the first line that does not start with <var>#</var>,
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23 this is needed only for templating languages where lines often start
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24 with <var>#</var>, such as Cheetah.</dd>
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25 <dt><code>#errors</code></dt>
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26 <dd>This is an error page which handles the specified HTTP error codes.
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27 See the subsection on error pages below. </dd>
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28 <dt><code>#forward</code></dt>
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29 <dd>Ignore everything else in this template (and any code-behind
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30 associated with it), using the specified route to serve it instead. The
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31 route specified with <code>#forward</code> may itself contain a <code>#forward</code>,
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32 but attempts to create a <code>#forward</code> loop are not allowed and
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33 will cause a <var>TinCanError</var> to be raised. Note that unlike
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34 calls to <code>app.forward()</code>, the <code>#forward</code> header
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35 is resolved at route-creation time; no extra processing will happen at
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36 request time.</dd>
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37 <dt><code>#hidden</code></dt>
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38 <dd>This is a hidden page; do not create a route for it. The page can only
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39 be displayed by a forward.</dd>
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40 <dt><code>#load</code></dt>
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41 <dd>Load the specified Chameleon template file and make the loaded
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42 template available as a template variable. Useful for importing and
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43 invoking macros. See the section on this directive below for more
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44 information.</dd>
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45 <dt><code>#methods</code></dt>
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46 <dd>A list of HTTP request methods, separated by whitespace, follows. The
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47 route will allow all specified methods. Not specifying this line is
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48 equivalent to specifying <code>#methods GET</code>.</dd>
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49 <dt><code>#python</code></dt>
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50 <dd>What follows is the name of the Python file containing the code-behind
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51 for this route. If not specified, the code-behind will be in a file with
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52 the same name but an extension of <var>.py</var>.</dd>
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53 <dt><code>#rem</code></dt>
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54 <dd>The rest of the line is treated as a remark (comment) and is ignored.</dd>
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55 <dt><code>#template</code></dt>
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56 <dd>Ignore the body of this file and instead use the template in the body
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57 of the specified file, which must end in <var>.pspx</var>. Any headers
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58 in the referred template file are ignored.</dd>
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59 </dl>
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60 <p>It is possible to include whitespace and special characters in arguments
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61 to the <code>#forward</code>, <code>#python</code>, and <code>#template</code>
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62 headers by using standard Python string quoting and escaping methods. For
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63 example, <code>#python "space case.py"</code>.</p>
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64 <p>Header directives that don't take arguments as a rule simply ignore them.
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65 For example, <code>#end headers</code> has the same effect as <code>#end</code>.
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66 </p>
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67 <h3>Error Pages</h3>
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68 <p>Error pages supersede the standard Bottle error handling, and are created
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69 by using the <code>#errors</code> page header. The <code>#hidden</code>
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70 and <code>#method</code> header directives are ignored in error pages
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71 (error pages are effectively hidden anyhow, by virtue of never having
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72 normal routes created for them).</p>
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73 <p>The <code>#errors</code> directive takes a list of numeric error codes
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74 (values from 400 to 599 are allowed); the page is created to handle the
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75 specified errors. If no error codes are specified, the page will handle
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76 all errors. The behavior of specifying multiple error pages for the same
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77 error code is undefined; doing so is best avoided.</p>
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78 <h3>Templates with No Code-Behind</h3>
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79 <p>Code-behind is optional for both normal and error page templates. If
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80 code-behind is not provided, TinCan will use the <var>Page</var> or <var>ErrorPage</var>
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81 class as appropriate. </p>
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82 <h3>Loading Templates</h3>
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83 <p>The <code>#load</code> directive may be used to load additional
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84 templates, e.g. ones containing macro definitions. Note that the loaded
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85 files are standard Chameleon templates and <em>not</em> TinCan <code>.pspx</code>
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86 files (i.e. they cannot contain any header directives); as such, loaded
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87 files must have the standard <var>.pt</var> extension for Chameleon
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88 template files.</p>
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89 <p>In the normal case, typing <code>#load foo.pt</code> will load a file
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90 relative to the same directory as the page containing the <code>#load</code>
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91 directive itself. The loaded template object will be made available as a
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92 template variable matching the file name sans extension (in this case, <samp>foo</samp>).
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93 One can change the name of the variable created by prefixing the file
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94 specification with a variable name followed by an equals sign,
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95 e.g. <code>#load t=foo.pt</code>. If one places the specification inside
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96 angle brackets (e.g. <code>#load &lt;t=foo.pt&gt;</code>), loaded files
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97 are searched for in <code>WEB-INF/tlib</code> instead.</p>
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98 <p>Finally, as is allowed for all arguments to header directives, one may
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99 enclose the argument to #load inside single or double quotes and use the
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100 normal Python backslash escaping.</p>
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101 <h3>Using Loaded Macros</h3>
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102 <p>Once a template has been loaded, it will be available as a sub-attribute
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103 of the <var>macros</var> attribute of the associated template object.
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104 E.g.:</p>
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105 <pre>#load foo.pt<br>&lt;!DOCTYPE html&gt;<br>&lt;html&gt;<br> &lt;head&gt;<br> &lt;title&gt;Macro Example&lt;/title&gt;<br> &lt;/head&gt;&lt;body&gt;<br> &lt;p metal:use-macro="foo.macros.bar"&gt;&lt;/p&gt;<br> &lt;/body&gt;<br>&lt;/html&gt;</pre>
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106 <h2>The Body</h2>
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107 <p>The body begins with the first line that <em>does not</em> start with <code>#</code>
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108 (or the first line after the <code>#end</code> directive, whichever comes
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109 first) and has the exact same syntax that the templates are in for this
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110 webapp. By default, Chameleon templates are used. Cheetah, Jinja2, Mako,
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111 and Bottle SimpleTemplate templates are also supported, provided the
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112 webapp was launched to use them. (Only one template style per webapp is
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113 supported.)</p>
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114 <p>In order to make line numbers match file line numbers for reported
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115 errors, the template engine will be passed a blank line for each header
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116 line encountered. TinCan will strip out all leading blank lines when
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117 rendering its responses.</p>
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118 <h3>Default Template Variables</h3>
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119 <p>By default, regular pages will have a single template variable available:
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120 <var>page</var>, which refers to the <var>Page</var> class that contains
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121 the code-behind logic for this page. The pertinent <var>bottle.Request</var>
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122 and <var>bottle.Response</var> objects are available to normal, non-error
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123 pages as <var>page.request</var> and <var>page.response</var>,
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124 respectively.</p>
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125 <p>Error pages have their code-behind logic in an <var>ErrorPage</var>
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126 class. In addition to the standard <var>page</var> variable, error pages
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127 also have <var>request</var> and <var>error</var> variables available by
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128 default, which contain copies of the pertinent <var>bottle.Request</var>
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129 and <var>bottle.HTTPError</var> objects respectively.</p>
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130 <p>The default behavior of the <var>export</var> method (which exports
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131 instance variables to template variables) in both the <var>Page</var> and
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132 <var>ErrorPage</var> classes is to export, in addition to the default
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133 variables, every user-created instance attribute that is not callable and
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134 whose name does not start with an underscore. This behavior can be changed
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135 if desired by overriding that method.</p>
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136 <p>Note that if for some reason you create an instance variable named <var>page</var>,
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137 it will overwrite the standard template variable by the same name.</p>
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138 <p></p>
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ca6f8ca38cf2 Another backup commit.
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139 </body>
ca6f8ca38cf2 Another backup commit.
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140 </html>