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annotate mercurial/parsers.c @ 6389:0231f763ebc8

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manifest: improve parsing performance by 8x via a new C extension
author Bryan O'Sullivan <bos@serpentine.com>
date Wed, 26 Mar 2008 10:12:10 -0700
parents
children 3f0294536b24
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rev   line source
6389
0231f763ebc8 manifest: improve parsing performance by 8x via a new C extension
Bryan O'Sullivan <bos@serpentine.com>
parents:
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1 /*
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2 parsers.c - efficient content parsing
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3
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4 Copyright 2008 Matt Mackall <mpm@selenic.com> and others
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5
0231f763ebc8 manifest: improve parsing performance by 8x via a new C extension
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6 This software may be used and distributed according to the terms of
0231f763ebc8 manifest: improve parsing performance by 8x via a new C extension
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7 the GNU General Public License, incorporated herein by reference.
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8 */
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9
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10 #include <Python.h>
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11 #include <ctype.h>
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12 #include <string.h>
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13
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14 static int hexdigit(char c)
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15 {
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16 if (c >= '0' && c <= '9')
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17 return c - '0';
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18
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19 if (c >= 'A' && c <= 'F')
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20 return c - 'A' + 10;
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21
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22 if (c >= 'a' && c <= 'f')
0231f763ebc8 manifest: improve parsing performance by 8x via a new C extension
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23 return c - 'a' + 10;
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24
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25 return -1;
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26 }
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27
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28 /*
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29 * Turn a hex-encoded string into binary.
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30 */
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31 static PyObject *unhexlify(const char *str, int len)
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32 {
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33 PyObject *ret = NULL;
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34 char *c, *d;
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35
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36 if (len % 2) {
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37 PyErr_SetString(PyExc_ValueError,
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38 "input is not even in length");
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39 goto bail;
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40 }
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41
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42 ret = PyString_FromStringAndSize(NULL, len / 2);
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43 if (!ret)
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44 goto bail;
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45
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46 d = PyString_AsString(ret);
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47 if (!d)
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48 goto bail;
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49
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50 for (c = str; c < str + len;) {
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51 int hi = hexdigit(*c++);
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52 int lo = hexdigit(*c++);
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53
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54 if (hi == -1 || lo == -1) {
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55 PyErr_SetString(PyExc_ValueError,
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56 "input contains non-hex character");
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57 goto bail;
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58 }
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59
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60 *d++ = (hi << 4) | lo;
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61 }
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62
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63 goto done;
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64
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65 bail:
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66 Py_XDECREF(ret);
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67 ret = NULL;
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68 done:
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69 return ret;
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70 }
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71
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72 /*
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73 * This code assumes that a manifest is stitched together with newline
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74 * ('\n') characters.
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75 */
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76 static PyObject *parse_manifest(PyObject *self, PyObject *args)
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77 {
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78 PyObject *mfdict, *fdict;
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79 char *str, *cur, *start, *zero;
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80 int len;
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81
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82 if (!PyArg_ParseTuple(args, "O!O!s#:parse_manifest",
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83 &PyDict_Type, &mfdict,
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84 &PyDict_Type, &fdict,
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85 &str, &len))
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86 goto quit;
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87
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88 for (start = cur = str, zero = NULL; cur < str + len; cur++) {
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89 PyObject *file = NULL, *node = NULL;
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90 PyObject *flags = NULL;
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91 int nlen;
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92
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93 if (!*cur) {
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94 zero = cur;
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95 continue;
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96 }
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97 else if (*cur != '\n')
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98 continue;
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99
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100 if (!zero) {
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101 PyErr_SetString(PyExc_ValueError,
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102 "manifest entry has no separator");
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103 goto quit;
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104 }
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105
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106 file = PyString_FromStringAndSize(start, zero - start);
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107 if (!file)
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108 goto bail;
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109
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110 nlen = cur - zero - 1;
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111
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112 node = unhexlify(zero + 1, nlen > 40 ? 40 : nlen);
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113 if (!node)
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114 goto bail;
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115
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116 if (nlen > 40) {
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117 PyObject *flags;
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118
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119 flags = PyString_FromStringAndSize(zero + 41,
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120 nlen - 40);
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121 if (!flags)
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122 goto bail;
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123
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124 if (PyDict_SetItem(fdict, file, flags) == -1)
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125 goto bail;
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126 }
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127
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128 if (PyDict_SetItem(mfdict, file, node) == -1)
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129 goto bail;
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130
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131 start = cur + 1;
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132 zero = NULL;
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133
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134 Py_XDECREF(flags);
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135 Py_XDECREF(node);
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136 Py_XDECREF(file);
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137 continue;
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138 bail:
0231f763ebc8 manifest: improve parsing performance by 8x via a new C extension
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139 Py_XDECREF(flags);
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140 Py_XDECREF(node);
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141 Py_XDECREF(file);
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142 goto quit;
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143 }
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144
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145 if (len > 0 && *(cur - 1) != '\n') {
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146 PyErr_SetString(PyExc_ValueError,
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147 "manifest contains trailing garbage");
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148 goto quit;
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149 }
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150
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151 Py_INCREF(Py_None);
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152 return Py_None;
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153
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154 quit:
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155 return NULL;
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156 }
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157
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158 static char parsers_doc[] = "Efficient content parsing.";
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159
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160 static PyMethodDef methods[] = {
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161 {"parse_manifest", parse_manifest, METH_VARARGS, "parse a manifest\n"},
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162 {NULL, NULL}
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163 };
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164
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165 PyMODINIT_FUNC initparsers(void)
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166 {
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167 Py_InitModule3("parsers", methods, parsers_doc);
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168 }