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annotate PageTemplates/PageTemplate.py @ 1029:c3e391d9c4e9

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author Richard Jones <richard@users.sourceforge.net>
date Tue, 03 Sep 2002 07:42:38 +0000
parents a3a8ac7b8c40
children
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1 ##############################################################################
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2 #
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3 # Copyright (c) 2001 Zope Corporation and Contributors. All Rights Reserved.
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4 #
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5 # This software is subject to the provisions of the Zope Public License,
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6 # Version 2.0 (ZPL). A copy of the ZPL should accompany this distribution.
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7 # THIS SOFTWARE IS PROVIDED "AS IS" AND ANY AND ALL EXPRESS OR IMPLIED
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8 # WARRANTIES ARE DISCLAIMED, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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9 # WARRANTIES OF TITLE, MERCHANTABILITY, AGAINST INFRINGEMENT, AND FITNESS
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10 # FOR A PARTICULAR PURPOSE
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11 #
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12 ##############################################################################
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13 """Page Template module
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14
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15 HTML- and XML-based template objects using TAL, TALES, and METAL.
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16 """
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17
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18 __version__='$Revision: 1.1 $'[11:-2]
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19
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20 import sys
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21
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22 from TAL.TALParser import TALParser
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23 from TAL.HTMLTALParser import HTMLTALParser
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24 from TAL.TALGenerator import TALGenerator
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25 from TAL.TALInterpreter import TALInterpreter
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26 from Expressions import getEngine
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27 from string import join, strip, rstrip, split, replace, lower, find
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28 from cStringIO import StringIO
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29 from ExtensionClass import Base
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30 from ComputedAttribute import ComputedAttribute
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31
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32
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33 class PageTemplate(Base):
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34 "Page Templates using TAL, TALES, and METAL"
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35
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36 content_type = 'text/html'
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37 expand = 0
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38 _v_errors = ()
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39 _v_warnings = ()
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40 _v_program = None
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41 _v_macros = None
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42 _v_cooked = 0
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43 id = '(unknown)'
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44 _text = ''
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45 _error_start = '<!-- Page Template Diagnostics'
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46
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47 def macros(self):
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48 return self.pt_macros()
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49 macros = ComputedAttribute(macros, 1)
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50
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51 def pt_edit(self, text, content_type):
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52 if content_type:
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53 self.content_type = str(content_type)
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54 if hasattr(text, 'read'):
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55 text = text.read()
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56 self.write(text)
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57
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58 def pt_getContext(self):
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59 c = {'template': self,
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60 'options': {},
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61 'nothing': None,
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62 'request': None,
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63 'modules': ModuleImporter,
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64 }
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65 parent = getattr(self, 'aq_parent', None)
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66 if parent is not None:
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67 c['here'] = parent
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68 c['container'] = self.aq_inner.aq_parent
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69 while parent is not None:
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70 self = parent
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71 parent = getattr(self, 'aq_parent', None)
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72 c['root'] = self
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73 return c
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74
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75 def pt_render(self, source=0, extra_context={}):
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76 """Render this Page Template"""
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77 if not self._v_cooked:
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78 self._cook()
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79
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80 __traceback_supplement__ = (PageTemplateTracebackSupplement, self)
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81
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82 if self._v_errors:
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83 raise PTRuntimeError, 'Page Template %s has errors.' % self.id
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84 output = StringIO()
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85 c = self.pt_getContext()
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86 c.update(extra_context)
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87
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88 TALInterpreter(self._v_program, self._v_macros,
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89 getEngine().getContext(c),
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90 output,
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91 tal=not source, strictinsert=0)()
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92 return output.getvalue()
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93
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94 def __call__(self, *args, **kwargs):
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95 if not kwargs.has_key('args'):
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96 kwargs['args'] = args
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97 return self.pt_render(extra_context={'options': kwargs})
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98
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99 def pt_errors(self):
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100 if not self._v_cooked:
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101 self._cook()
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102 err = self._v_errors
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103 if err:
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104 return err
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105 if not self.expand: return
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106 try:
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107 self.pt_render(source=1)
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108 except:
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109 return ('Macro expansion failed', '%s: %s' % sys.exc_info()[:2])
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110
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111 def pt_warnings(self):
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112 if not self._v_cooked:
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113 self._cook()
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114 return self._v_warnings
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115
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116 def pt_macros(self):
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117 if not self._v_cooked:
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118 self._cook()
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119 if self._v_errors:
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120 __traceback_supplement__ = (PageTemplateTracebackSupplement, self)
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121 raise PTRuntimeError, 'Page Template %s has errors.' % self.id
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122 return self._v_macros
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123
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124 def pt_source_file(self):
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125 return None # Unknown.
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126
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127 def write(self, text):
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128 assert type(text) is type('')
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129 if text[:len(self._error_start)] == self._error_start:
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130 errend = find(text, '-->')
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131 if errend >= 0:
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132 text = text[errend + 4:]
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133 if self._text != text:
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134 self._text = text
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135 self._cook()
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136
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137 def read(self):
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138 if not self._v_cooked:
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139 self._cook()
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140 if not self._v_errors:
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141 if not self.expand:
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142 return self._text
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143 try:
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144 return self.pt_render(source=1)
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145 except:
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146 return ('%s\n Macro expansion failed\n %s\n-->\n%s' %
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147 (self._error_start, "%s: %s" % sys.exc_info()[:2],
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148 self._text) )
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149
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150 return ('%s\n %s\n-->\n%s' % (self._error_start,
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151 join(self._v_errors, '\n '),
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152 self._text))
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153
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154 def _cook(self):
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155 """Compile the TAL and METAL statments.
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156
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157 Cooking must not fail due to compilation errors in templates.
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158 """
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159 source_file = self.pt_source_file()
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160 if self.html():
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161 gen = TALGenerator(getEngine(), xml=0, source_file=source_file)
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162 parser = HTMLTALParser(gen)
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163 else:
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164 gen = TALGenerator(getEngine(), source_file=source_file)
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165 parser = TALParser(gen)
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166
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167 self._v_errors = ()
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168 try:
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169 parser.parseString(self._text)
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170 self._v_program, self._v_macros = parser.getCode()
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171 except:
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172 self._v_errors = ["Compilation failed",
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173 "%s: %s" % sys.exc_info()[:2]]
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174 self._v_warnings = parser.getWarnings()
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175 self._v_cooked = 1
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176
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177 def html(self):
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178 if not hasattr(getattr(self, 'aq_base', self), 'is_html'):
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179 return self.content_type == 'text/html'
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180 return self.is_html
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181
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182 class _ModuleImporter:
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183 def __getitem__(self, module):
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184 mod = __import__(module)
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185 path = split(module, '.')
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186 for name in path[1:]:
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187 mod = getattr(mod, name)
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188 return mod
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189
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190 ModuleImporter = _ModuleImporter()
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191
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192 class PTRuntimeError(RuntimeError):
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193 '''The Page Template has template errors that prevent it from rendering.'''
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194 pass
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195
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196
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197 class PageTemplateTracebackSupplement:
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198 #__implements__ = ITracebackSupplement
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199
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200 def __init__(self, pt):
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201 self.object = pt
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202 w = pt.pt_warnings()
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203 e = pt.pt_errors()
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204 if e:
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205 w = list(w) + list(e)
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206 self.warnings = w
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207
Roundup Issue Tracker: http://roundup-tracker.org/