Mercurial > repos > bcclaywell > argo_navis

annotate venv/lib/python2.7/site-packages/markupsafe/_speedups.c @ 0:d67268158946 draft

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planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
author bcclaywell
date Mon, 12 Oct 2015 17:43:33 -0400
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1 /**
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2 * markupsafe._speedups
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3 * ~~~~~~~~~~~~~~~~~~~~
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4 *
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5 * This module implements functions for automatic escaping in C for better
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6 * performance.
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7 *
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8 * :copyright: (c) 2010 by Armin Ronacher.
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9 * :license: BSD.
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10 */
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11
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12 #include <Python.h>
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13
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14 #define ESCAPED_CHARS_TABLE_SIZE 63
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15 #define UNICHR(x) (PyUnicode_AS_UNICODE((PyUnicodeObject*)PyUnicode_DecodeASCII(x, strlen(x), NULL)));
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16
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17 #if PY_VERSION_HEX < 0x02050000 && !defined(PY_SSIZE_T_MIN)
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18 typedef int Py_ssize_t;
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19 #define PY_SSIZE_T_MAX INT_MAX
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20 #define PY_SSIZE_T_MIN INT_MIN
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21 #endif
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22
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23
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24 static PyObject* markup;
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25 static Py_ssize_t escaped_chars_delta_len[ESCAPED_CHARS_TABLE_SIZE];
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26 static Py_UNICODE *escaped_chars_repl[ESCAPED_CHARS_TABLE_SIZE];
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27
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28 static int
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29 init_constants(void)
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30 {
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31 PyObject *module;
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32 /* happing of characters to replace */
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33 escaped_chars_repl['"'] = UNICHR("&#34;");
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34 escaped_chars_repl['\''] = UNICHR("&#39;");
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35 escaped_chars_repl['&'] = UNICHR("&amp;");
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36 escaped_chars_repl['<'] = UNICHR("&lt;");
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37 escaped_chars_repl['>'] = UNICHR("&gt;");
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38
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39 /* lengths of those characters when replaced - 1 */
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40 memset(escaped_chars_delta_len, 0, sizeof (escaped_chars_delta_len));
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41 escaped_chars_delta_len['"'] = escaped_chars_delta_len['\''] = \
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42 escaped_chars_delta_len['&'] = 4;
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43 escaped_chars_delta_len['<'] = escaped_chars_delta_len['>'] = 3;
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44
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45 /* import markup type so that we can mark the return value */
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46 module = PyImport_ImportModule("markupsafe");
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47 if (!module)
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48 return 0;
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49 markup = PyObject_GetAttrString(module, "Markup");
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50 Py_DECREF(module);
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51
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52 return 1;
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53 }
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54
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55 static PyObject*
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56 escape_unicode(PyUnicodeObject *in)
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57 {
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58 PyUnicodeObject *out;
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59 Py_UNICODE *inp = PyUnicode_AS_UNICODE(in);
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60 const Py_UNICODE *inp_end = PyUnicode_AS_UNICODE(in) + PyUnicode_GET_SIZE(in);
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61 Py_UNICODE *next_escp;
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62 Py_UNICODE *outp;
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63 Py_ssize_t delta=0, erepl=0, delta_len=0;
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64
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65 /* First we need to figure out how long the escaped string will be */
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66 while (*(inp) || inp < inp_end) {
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67 if (*inp < ESCAPED_CHARS_TABLE_SIZE) {
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68 delta += escaped_chars_delta_len[*inp];
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69 erepl += !!escaped_chars_delta_len[*inp];
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70 }
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71 ++inp;
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72 }
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73
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74 /* Do we need to escape anything at all? */
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75 if (!erepl) {
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76 Py_INCREF(in);
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77 return (PyObject*)in;
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78 }
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79
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80 out = (PyUnicodeObject*)PyUnicode_FromUnicode(NULL, PyUnicode_GET_SIZE(in) + delta);
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81 if (!out)
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82 return NULL;
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83
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84 outp = PyUnicode_AS_UNICODE(out);
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85 inp = PyUnicode_AS_UNICODE(in);
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86 while (erepl-- > 0) {
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87 /* look for the next substitution */
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88 next_escp = inp;
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89 while (next_escp < inp_end) {
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90 if (*next_escp < ESCAPED_CHARS_TABLE_SIZE &&
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91 (delta_len = escaped_chars_delta_len[*next_escp])) {
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92 ++delta_len;
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93 break;
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94 }
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95 ++next_escp;
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96 }
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97
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98 if (next_escp > inp) {
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99 /* copy unescaped chars between inp and next_escp */
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100 Py_UNICODE_COPY(outp, inp, next_escp-inp);
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101 outp += next_escp - inp;
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102 }
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103
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104 /* escape 'next_escp' */
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105 Py_UNICODE_COPY(outp, escaped_chars_repl[*next_escp], delta_len);
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106 outp += delta_len;
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107
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108 inp = next_escp + 1;
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109 }
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110 if (inp < inp_end)
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111 Py_UNICODE_COPY(outp, inp, PyUnicode_GET_SIZE(in) - (inp - PyUnicode_AS_UNICODE(in)));
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112
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113 return (PyObject*)out;
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114 }
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115
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116
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117 static PyObject*
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118 escape(PyObject *self, PyObject *text)
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119 {
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120 PyObject *s = NULL, *rv = NULL, *html;
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121
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122 /* we don't have to escape integers, bools or floats */
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123 if (PyLong_CheckExact(text) ||
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124 #if PY_MAJOR_VERSION < 3
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125 PyInt_CheckExact(text) ||
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126 #endif
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127 PyFloat_CheckExact(text) || PyBool_Check(text) ||
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128 text == Py_None)
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129 return PyObject_CallFunctionObjArgs(markup, text, NULL);
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130
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131 /* if the object has an __html__ method that performs the escaping */
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132 html = PyObject_GetAttrString(text, "__html__");
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133 if (html) {
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134 rv = PyObject_CallObject(html, NULL);
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135 Py_DECREF(html);
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136 return rv;
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137 }
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138
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139 /* otherwise make the object unicode if it isn't, then escape */
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140 PyErr_Clear();
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141 if (!PyUnicode_Check(text)) {
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142 #if PY_MAJOR_VERSION < 3
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143 PyObject *unicode = PyObject_Unicode(text);
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144 #else
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145 PyObject *unicode = PyObject_Str(text);
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146 #endif
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147 if (!unicode)
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148 return NULL;
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149 s = escape_unicode((PyUnicodeObject*)unicode);
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150 Py_DECREF(unicode);
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151 }
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152 else
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153 s = escape_unicode((PyUnicodeObject*)text);
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154
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155 /* convert the unicode string into a markup object. */
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156 rv = PyObject_CallFunctionObjArgs(markup, (PyObject*)s, NULL);
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157 Py_DECREF(s);
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158 return rv;
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159 }
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160
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161
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162 static PyObject*
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163 escape_silent(PyObject *self, PyObject *text)
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164 {
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165 if (text != Py_None)
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166 return escape(self, text);
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167 return PyObject_CallFunctionObjArgs(markup, NULL);
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168 }
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169
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170
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171 static PyObject*
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172 soft_unicode(PyObject *self, PyObject *s)
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173 {
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174 if (!PyUnicode_Check(s))
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175 #if PY_MAJOR_VERSION < 3
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176 return PyObject_Unicode(s);
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177 #else
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178 return PyObject_Str(s);
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179 #endif
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180 Py_INCREF(s);
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181 return s;
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182 }
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183
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184
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185 static PyMethodDef module_methods[] = {
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186 {"escape", (PyCFunction)escape, METH_O,
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187 "escape(s) -> markup\n\n"
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188 "Convert the characters &, <, >, ', and \" in string s to HTML-safe\n"
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189 "sequences. Use this if you need to display text that might contain\n"
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190 "such characters in HTML. Marks return value as markup string."},
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191 {"escape_silent", (PyCFunction)escape_silent, METH_O,
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192 "escape_silent(s) -> markup\n\n"
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193 "Like escape but converts None to an empty string."},
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194 {"soft_unicode", (PyCFunction)soft_unicode, METH_O,
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195 "soft_unicode(object) -> string\n\n"
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196 "Make a string unicode if it isn't already. That way a markup\n"
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197 "string is not converted back to unicode."},
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198 {NULL, NULL, 0, NULL} /* Sentinel */
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199 };
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200
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201
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202 #if PY_MAJOR_VERSION < 3
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203
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204 #ifndef PyMODINIT_FUNC /* declarations for DLL import/export */
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205 #define PyMODINIT_FUNC void
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206 #endif
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207 PyMODINIT_FUNC
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208 init_speedups(void)
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209 {
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210 if (!init_constants())
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211 return;
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212
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213 Py_InitModule3("markupsafe._speedups", module_methods, "");
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214 }
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215
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216 #else /* Python 3.x module initialization */
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217
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218 static struct PyModuleDef module_definition = {
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219 PyModuleDef_HEAD_INIT,
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220 "markupsafe._speedups",
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221 NULL,
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222 -1,
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223 module_methods,
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224 NULL,
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225 NULL,
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226 NULL,
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227 NULL
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228 };
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229
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230 PyMODINIT_FUNC
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231 PyInit__speedups(void)
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232 {
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233 if (!init_constants())
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234 return NULL;
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235
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236 return PyModule_Create(&module_definition);
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237 }
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238
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239 #endif