annotate emeraldtree/SimpleXMLWriter.py @ 47:e647f30cc08e

remove backwards compat code for python < 2.4
author Thomas Waldmann <tw AT waldmann-edv DOT de>
date Sun, 03 Aug 2008 20:59:44 +0200
parents 34be1290ac0b
children
rev   line source
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5169fce2d144 Import ElementTree (1.3a3-20070912-preview).
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1 #
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2 # SimpleXMLWriter
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3 # $Id: SimpleXMLWriter.py 3265 2007-09-06 20:42:00Z fredrik $
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4 #
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5 # a simple XML writer
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6 #
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7 # history:
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8 # 2001-12-28 fl created
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9 # 2002-11-25 fl fixed attribute encoding
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10 # 2002-12-02 fl minor fixes for 1.5.2
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11 # 2004-06-17 fl added pythondoc markup
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12 # 2004-07-23 fl added flush method (from Jay Graves)
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13 # 2004-10-03 fl added declaration method
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14 #
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15 # Copyright (c) 2001-2004 by Fredrik Lundh
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16 #
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17 # fredrik@pythonware.com
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18 # http://www.pythonware.com
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19 #
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20 # --------------------------------------------------------------------
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21 # The SimpleXMLWriter module is
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22 #
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23 # Copyright (c) 2001-2004 by Fredrik Lundh
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24 #
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25 # By obtaining, using, and/or copying this software and/or its
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26 # associated documentation, you agree that you have read, understood,
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27 # and will comply with the following terms and conditions:
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28 #
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29 # Permission to use, copy, modify, and distribute this software and
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30 # its associated documentation for any purpose and without fee is
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31 # hereby granted, provided that the above copyright notice appears in
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32 # all copies, and that both that copyright notice and this permission
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33 # notice appear in supporting documentation, and that the name of
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34 # Secret Labs AB or the author not be used in advertising or publicity
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35 # pertaining to distribution of the software without specific, written
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36 # prior permission.
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37 #
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38 # SECRET LABS AB AND THE AUTHOR DISCLAIMS ALL WARRANTIES WITH REGARD
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39 # TO THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANT-
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40 # ABILITY AND FITNESS. IN NO EVENT SHALL SECRET LABS AB OR THE AUTHOR
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41 # BE LIABLE FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY
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42 # DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
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43 # WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
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44 # ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
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45 # OF THIS SOFTWARE.
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46 # --------------------------------------------------------------------
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47
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48 ##
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49 # Tools to write XML files, without having to deal with encoding
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50 # issues, well-formedness, etc.
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51 # <p>
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52 # The current version does not provide built-in support for
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53 # namespaces. To create files using namespaces, you have to provide
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54 # "xmlns" attributes and explicitly add prefixes to tags and
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55 # attributes.
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56 #
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57 # <h3>Patterns</h3>
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58 #
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59 # The following example generates a small XHTML document.
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60 # <pre>
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61 #
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62 # from elementtree.SimpleXMLWriter import XMLWriter
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63 # import sys
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64 #
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65 # w = XMLWriter(sys.stdout)
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66 #
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67 # html = w.start("html")
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68 #
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69 # w.start("head")
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70 # w.element("title", "my document")
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71 # w.element("meta", name="generator", value="my application 1.0")
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72 # w.end()
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73 #
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74 # w.start("body")
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75 # w.element("h1", "this is a heading")
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76 # w.element("p", "this is a paragraph")
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77 #
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78 # w.start("p")
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79 # w.data("this is ")
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80 # w.element("b", "bold")
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81 # w.data(" and ")
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82 # w.element("i", "italic")
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83 # w.data(".")
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84 # w.end("p")
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85 #
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86 # w.close(html)
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87 # </pre>
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88 ##
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89
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90 import re
0
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91
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92 def encode(s, encoding):
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93 return s.encode(encoding)
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94
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95 def encode_entity(text, pattern=re.compile(ur'[&<>"\u0080-\uffff]+')):
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96 # map reserved and non-ascii characters to numerical entities
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97 def escape_entities(m):
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98 out = []
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99 for char in m.group():
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100 out.append("&#%d;" % ord(char))
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101 return "".join(out)
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102 return encode(pattern.sub(escape_entities, text), "ascii")
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103
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104 #
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105 # the following functions assume an ascii-compatible encoding
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106 # (or "utf-16")
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107
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108 def escape_cdata(s, encoding=None):
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109 s = s.replace("&", "&amp;")
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110 s = s.replace("<", "&lt;")
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111 s = s.replace(">", "&gt;")
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112 if encoding:
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113 try:
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114 return encode(s, encoding)
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115 except UnicodeError:
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116 return encode_entity(s)
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117 return s
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118
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119 def escape_attrib(s, encoding=None):
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120 s = s.replace("&", "&amp;")
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121 s = s.replace("'", "&apos;")
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122 s = s.replace('"', "&quot;")
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123 s = s.replace("<", "&lt;")
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124 s = s.replace(">", "&gt;")
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125 if encoding:
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126 try:
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127 return encode(s, encoding)
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128 except UnicodeError:
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129 return encode_entity(s)
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130 return s
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131
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132 ##
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133 # XML writer class.
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134 #
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135 # @param file A file or file-like object. This object must implement
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136 # a <b>write</b> method that takes an 8-bit string.
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137 # @param encoding Optional encoding.
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138
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139 class XMLWriter:
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140
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141 def __init__(self, file, encoding="us-ascii"):
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142 if not hasattr(file, "write"):
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143 file = open(file, "w")
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144 self.__write = file.write
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145 if hasattr(file, "flush"):
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146 self.flush = file.flush
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147 self.__open = 0 # true if start tag is open
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148 self.__tags = []
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149 self.__data = []
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150 self.__encoding = encoding
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151
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152 def __flush(self):
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153 # flush internal buffers
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154 if self.__open:
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155 self.__write(">")
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156 self.__open = 0
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157 if self.__data:
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158 data = "".join(self.__data)
0
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159 self.__write(escape_cdata(data, self.__encoding))
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160 self.__data = []
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161
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162 ##
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163 # Writes an XML declaration.
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164
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165 def declaration(self):
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166 encoding = self.__encoding
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167 if encoding == "us-ascii" or encoding == "utf-8":
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168 self.__write("<?xml version='1.0'?>\n")
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169 else:
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170 self.__write("<?xml version='1.0' encoding='%s'?>\n" % encoding)
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171
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172 ##
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173 # Opens a new element. Attributes can be given as keyword
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174 # arguments, or as a string/string dictionary. You can pass in
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175 # 8-bit strings or Unicode strings; the former are assumed to use
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176 # the encoding passed to the constructor. The method returns an
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177 # opaque identifier that can be passed to the <b>close</b> method,
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178 # to close all open elements up to and including this one.
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179 #
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180 # @param tag Element tag.
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181 # @param attrib Attribute dictionary. Alternatively, attributes
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182 # can be given as keyword arguments.
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183 # @return An element identifier.
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184
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185 def start(self, tag, attrib={}, **extra):
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186 self.__flush()
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187 tag = escape_cdata(tag, self.__encoding)
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188 self.__data = []
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189 self.__tags.append(tag)
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190 self.__write("<%s" % tag)
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191 if attrib or extra:
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192 attrib = attrib.copy()
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193 attrib.update(extra)
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194 attrib = attrib.items()
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195 attrib.sort()
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196 for k, v in attrib:
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197 k = escape_cdata(k, self.__encoding)
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198 v = escape_attrib(v, self.__encoding)
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199 self.__write(" %s=\"%s\"" % (k, v))
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200 self.__open = 1
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201 return len(self.__tags)-1
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202
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203 ##
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204 # Adds a comment to the output stream.
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205 #
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206 # @param comment Comment text, as an 8-bit string or Unicode string.
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207
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208 def comment(self, comment):
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209 self.__flush()
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210 self.__write("<!-- %s -->\n" % escape_cdata(comment, self.__encoding))
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211
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212 ##
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213 # Adds character data to the output stream.
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214 #
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215 # @param text Character data, as an 8-bit string or Unicode string.
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216
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217 def data(self, text):
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218 self.__data.append(text)
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219
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220 ##
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221 # Closes the current element (opened by the most recent call to
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222 # <b>start</b>).
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223 #
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224 # @param tag Element tag. If given, the tag must match the start
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225 # tag. If omitted, the current element is closed.
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226
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227 def end(self, tag=None):
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228 if tag:
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229 assert self.__tags, "unbalanced end(%s)" % tag
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230 assert escape_cdata(tag, self.__encoding) == self.__tags[-1],\
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231 "expected end(%s), got %s" % (self.__tags[-1], tag)
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232 else:
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233 assert self.__tags, "unbalanced end()"
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234 tag = self.__tags.pop()
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235 if self.__data:
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236 self.__flush()
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237 elif self.__open:
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238 self.__open = 0
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239 self.__write(" />")
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240 return
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241 self.__write("</%s>" % tag)
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242
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243 ##
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244 # Closes open elements, up to (and including) the element identified
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245 # by the given identifier.
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246 #
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247 # @param id Element identifier, as returned by the <b>start</b> method.
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248
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249 def close(self, id):
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250 while len(self.__tags) > id:
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251 self.end()
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252
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253 ##
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254 # Adds an entire element. This is the same as calling <b>start</b>,
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255 # <b>data</b>, and <b>end</b> in sequence. The <b>text</b> argument
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256 # can be omitted.
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257
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258 def element(self, tag, text=None, attrib={}, **extra):
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259 apply(self.start, (tag, attrib), extra)
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260 if text:
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261 self.data(text)
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262 self.end()
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263
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264 ##
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265 # Flushes the output stream.
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266
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267 def flush(self):
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268 pass # replaced by the constructor