annotate mercurial/diffhelpers.c @ 21392:b1ce47dadbdf

merge: separate worker functions for batch remove and batch get The old code had one function that could do 2 different things. First, is was called a bunch of times to do one thing. Next, it was called a bunch of times to do the other thing. That gave unnecessary complexity and a dispatch overhead. Having separate functions is "obviously" better than having a function that can do two things, depending on its parameters. It also prepares the code for the next refactorings.
author Mads Kiilerich <madski@unity3d.com>
date Fri, 09 May 2014 12:01:56 +0200
parents 0a0933d3d59c
children c8e7fa41bfc5
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 /*
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2 * diffhelpers.c - helper routines for mpatch
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3 *
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4 * Copyright 2007 Chris Mason <chris.mason@oracle.com>
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5 *
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6 * This software may be used and distributed according to the terms
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7 * of the GNU General Public License v2, 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 <stdlib.h>
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12 #include <string.h>
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13
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14 #include "util.h"
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15
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16 static char diffhelpers_doc[] = "Efficient diff parsing";
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17 static PyObject *diffhelpers_Error;
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18
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19
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20 /* fixup the last lines of a and b when the patch has no newline at eof */
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21 static void _fix_newline(PyObject *hunk, PyObject *a, PyObject *b)
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22 {
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23 Py_ssize_t hunksz = PyList_Size(hunk);
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24 PyObject *s = PyList_GET_ITEM(hunk, hunksz-1);
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25 char *l = PyBytes_AsString(s);
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26 Py_ssize_t alen = PyList_Size(a);
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27 Py_ssize_t blen = PyList_Size(b);
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28 char c = l[0];
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29 PyObject *hline;
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30 Py_ssize_t sz = PyBytes_GET_SIZE(s);
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31
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32 if (sz > 1 && l[sz-2] == '\r')
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33 /* tolerate CRLF in last line */
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34 sz -= 1;
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35
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36 hline = PyBytes_FromStringAndSize(l, sz-1);
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37
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38 if (c == ' ' || c == '+') {
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39 PyObject *rline = PyBytes_FromStringAndSize(l + 1, sz - 2);
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40 PyList_SetItem(b, blen-1, rline);
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41 }
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42 if (c == ' ' || c == '-') {
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43 Py_INCREF(hline);
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44 PyList_SetItem(a, alen-1, hline);
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45 }
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46 PyList_SetItem(hunk, hunksz-1, hline);
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47 }
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48
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49 /* python callable form of _fix_newline */
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50 static PyObject *
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51 fix_newline(PyObject *self, PyObject *args)
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52 {
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53 PyObject *hunk, *a, *b;
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54 if (!PyArg_ParseTuple(args, "OOO", &hunk, &a, &b))
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55 return NULL;
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56 _fix_newline(hunk, a, b);
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57 return Py_BuildValue("l", 0);
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58 }
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59
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60 #if (PY_VERSION_HEX < 0x02050000)
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61 static const char *addlines_format = "OOiiOO";
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62 #else
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63 static const char *addlines_format = "OOnnOO";
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64 #endif
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65
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66 /*
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67 * read lines from fp into the hunk. The hunk is parsed into two arrays
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68 * a and b. a gets the old state of the text, b gets the new state
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69 * The control char from the hunk is saved when inserting into a, but not b
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70 * (for performance while deleting files)
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71 */
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72 static PyObject *
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73 addlines(PyObject *self, PyObject *args)
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74 {
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75
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76 PyObject *fp, *hunk, *a, *b, *x;
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77 Py_ssize_t i;
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78 Py_ssize_t lena, lenb;
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79 Py_ssize_t num;
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80 Py_ssize_t todoa, todob;
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81 char *s, c;
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82 PyObject *l;
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83 if (!PyArg_ParseTuple(args, addlines_format,
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84 &fp, &hunk, &lena, &lenb, &a, &b))
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85 return NULL;
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86
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87 while (1) {
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88 todoa = lena - PyList_Size(a);
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89 todob = lenb - PyList_Size(b);
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90 num = todoa > todob ? todoa : todob;
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91 if (num == 0)
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92 break;
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93 for (i = 0; i < num; i++) {
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94 x = PyFile_GetLine(fp, 0);
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95 s = PyBytes_AsString(x);
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96 c = *s;
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97 if (strcmp(s, "\\ No newline at end of file\n") == 0) {
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98 _fix_newline(hunk, a, b);
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99 continue;
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100 }
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101 if (c == '\n') {
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102 /* Some patches may be missing the control char
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103 * on empty lines. Supply a leading space. */
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104 Py_DECREF(x);
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105 x = PyBytes_FromString(" \n");
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106 }
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107 PyList_Append(hunk, x);
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108 if (c == '+') {
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109 l = PyBytes_FromString(s + 1);
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110 PyList_Append(b, l);
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111 Py_DECREF(l);
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112 } else if (c == '-') {
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113 PyList_Append(a, x);
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114 } else {
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115 l = PyBytes_FromString(s + 1);
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116 PyList_Append(b, l);
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117 Py_DECREF(l);
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118 PyList_Append(a, x);
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119 }
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120 Py_DECREF(x);
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121 }
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122 }
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123 return Py_BuildValue("l", 0);
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124 }
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125
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126 /*
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127 * compare the lines in a with the lines in b. a is assumed to have
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128 * a control char at the start of each line, this char is ignored in the
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129 * compare
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130 */
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131 static PyObject *
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132 testhunk(PyObject *self, PyObject *args)
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133 {
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134
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135 PyObject *a, *b;
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136 long bstart;
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137 Py_ssize_t alen, blen;
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138 Py_ssize_t i;
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139 char *sa, *sb;
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140
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141 if (!PyArg_ParseTuple(args, "OOl", &a, &b, &bstart))
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142 return NULL;
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143 alen = PyList_Size(a);
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144 blen = PyList_Size(b);
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145 if (alen > blen - bstart || bstart < 0) {
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146 return Py_BuildValue("l", -1);
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147 }
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148 for (i = 0; i < alen; i++) {
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149 sa = PyBytes_AsString(PyList_GET_ITEM(a, i));
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150 sb = PyBytes_AsString(PyList_GET_ITEM(b, i + bstart));
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151 if (strcmp(sa + 1, sb) != 0)
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152 return Py_BuildValue("l", -1);
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153 }
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154 return Py_BuildValue("l", 0);
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155 }
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156
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157 static PyMethodDef methods[] = {
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158 {"addlines", addlines, METH_VARARGS, "add lines to a hunk\n"},
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159 {"fix_newline", fix_newline, METH_VARARGS, "fixup newline counters\n"},
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160 {"testhunk", testhunk, METH_VARARGS, "test lines in a hunk\n"},
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161 {NULL, NULL}
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162 };
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163
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164 #ifdef IS_PY3K
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165 static struct PyModuleDef diffhelpers_module = {
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166 PyModuleDef_HEAD_INIT,
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167 "diffhelpers",
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168 diffhelpers_doc,
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169 -1,
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170 methods
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171 };
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172
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173 PyMODINIT_FUNC PyInit_diffhelpers(void)
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174 {
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175 PyObject *m;
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176
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177 m = PyModule_Create(&diffhelpers_module);
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178 if (m == NULL)
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179 return NULL;
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180
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181 diffhelpers_Error = PyErr_NewException("diffhelpers.diffhelpersError",
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182 NULL, NULL);
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183 Py_INCREF(diffhelpers_Error);
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184 PyModule_AddObject(m, "diffhelpersError", diffhelpers_Error);
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185
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186 return m;
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187 }
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188 #else
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189 PyMODINIT_FUNC
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190 initdiffhelpers(void)
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191 {
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192 Py_InitModule3("diffhelpers", methods, diffhelpers_doc);
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193 diffhelpers_Error = PyErr_NewException("diffhelpers.diffhelpersError",
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194 NULL, NULL);
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195 }
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196 #endif
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197