1 | /* GLIB - Library of useful routines for C programming |
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2 | * Copyright (C) 1995-1997 Peter Mattis, Spencer Kimball and Josh MacDonald |
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3 | * |
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4 | * This library is free software; you can redistribute it and/or |
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5 | * modify it under the terms of the GNU Library General Public |
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6 | * License as published by the Free Software Foundation; either |
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7 | * version 2 of the License, or (at your option) any later version. |
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8 | * |
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9 | * This library is distributed in the hope that it will be useful, |
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10 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
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11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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12 | * Library General Public License for more details. |
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13 | * |
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14 | * You should have received a copy of the GNU Library General Public |
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15 | * License along with this library; if not, write to the |
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16 | * Free Software Foundation, Inc., 59 Temple Place - Suite 330, |
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17 | * Boston, MA 02111-1307, USA. |
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18 | */ |
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19 | |
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20 | /* |
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21 | * Modified by the GLib Team and others 1997-1999. See the AUTHORS |
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22 | * file for a list of people on the GLib Team. See the ChangeLog |
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23 | * files for a list of changes. These files are distributed with |
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24 | * GLib at ftp://ftp.gtk.org/pub/gtk/. |
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25 | */ |
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26 | |
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27 | /* |
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28 | * MT safe |
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29 | */ |
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30 | |
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31 | #include "glib.h" |
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32 | #include <string.h> |
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33 | |
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34 | static void completion_check_cache (GCompletion* cmp, |
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35 | gchar** new_prefix); |
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36 | |
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37 | GCompletion* |
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38 | g_completion_new (GCompletionFunc func) |
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39 | { |
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40 | GCompletion* gcomp; |
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41 | |
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42 | gcomp = g_new (GCompletion, 1); |
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43 | gcomp->items = NULL; |
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44 | gcomp->cache = NULL; |
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45 | gcomp->prefix = NULL; |
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46 | gcomp->func = func; |
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47 | |
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48 | return gcomp; |
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49 | } |
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50 | |
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51 | void |
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52 | g_completion_add_items (GCompletion* cmp, |
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53 | GList* items) |
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54 | { |
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55 | GList* it; |
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56 | |
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57 | g_return_if_fail (cmp != NULL); |
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58 | g_return_if_fail (items != NULL); |
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59 | |
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60 | /* optimize adding to cache? */ |
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61 | if (cmp->cache) |
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62 | { |
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63 | g_list_free (cmp->cache); |
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64 | cmp->cache = NULL; |
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65 | } |
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66 | |
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67 | if (cmp->prefix) |
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68 | { |
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69 | g_free (cmp->prefix); |
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70 | cmp->prefix = NULL; |
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71 | } |
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72 | |
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73 | it = items; |
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74 | while (it) |
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75 | { |
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76 | cmp->items = g_list_prepend (cmp->items, it->data); |
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77 | it = it->next; |
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78 | } |
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79 | } |
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80 | |
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81 | void |
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82 | g_completion_remove_items (GCompletion* cmp, |
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83 | GList* items) |
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84 | { |
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85 | GList* it; |
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86 | |
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87 | g_return_if_fail (cmp != NULL); |
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88 | g_return_if_fail (items != NULL); |
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89 | |
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90 | it = items; |
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91 | while (cmp->items && it) |
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92 | { |
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93 | cmp->items = g_list_remove (cmp->items, it->data); |
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94 | it = it->next; |
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95 | } |
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96 | |
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97 | it = items; |
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98 | while (cmp->cache && it) |
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99 | { |
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100 | cmp->cache = g_list_remove(cmp->cache, it->data); |
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101 | it = it->next; |
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102 | } |
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103 | } |
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104 | |
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105 | void |
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106 | g_completion_clear_items (GCompletion* cmp) |
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107 | { |
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108 | g_return_if_fail (cmp != NULL); |
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109 | |
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110 | g_list_free (cmp->items); |
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111 | cmp->items = NULL; |
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112 | g_list_free (cmp->cache); |
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113 | cmp->cache = NULL; |
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114 | g_free (cmp->prefix); |
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115 | cmp->prefix = NULL; |
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116 | } |
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117 | |
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118 | static void |
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119 | completion_check_cache (GCompletion* cmp, |
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120 | gchar** new_prefix) |
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121 | { |
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122 | register GList* list; |
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123 | register gint len; |
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124 | register gint i; |
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125 | register gint plen; |
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126 | gchar* postfix; |
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127 | gchar* s; |
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128 | |
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129 | if (!new_prefix) |
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130 | return; |
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131 | if (!cmp->cache) |
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132 | { |
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133 | *new_prefix = NULL; |
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134 | return; |
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135 | } |
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136 | |
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137 | len = strlen(cmp->prefix); |
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138 | list = cmp->cache; |
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139 | s = cmp->func ? cmp->func (list->data) : (gchar*) list->data; |
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140 | postfix = s + len; |
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141 | plen = strlen (postfix); |
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142 | list = list->next; |
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143 | |
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144 | while (list && plen) |
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145 | { |
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146 | s = cmp->func ? cmp->func (list->data) : (gchar*) list->data; |
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147 | s += len; |
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148 | for (i = 0; i < plen; ++i) |
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149 | { |
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150 | if (postfix[i] != s[i]) |
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151 | break; |
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152 | } |
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153 | plen = i; |
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154 | list = list->next; |
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155 | } |
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156 | |
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157 | *new_prefix = g_new0 (gchar, len + plen + 1); |
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158 | strncpy (*new_prefix, cmp->prefix, len); |
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159 | strncpy (*new_prefix + len, postfix, plen); |
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160 | } |
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161 | |
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162 | GList* |
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163 | g_completion_complete (GCompletion* cmp, |
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164 | gchar* prefix, |
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165 | gchar** new_prefix) |
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166 | { |
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167 | gint plen, len; |
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168 | gint done = 0; |
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169 | GList* list; |
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170 | |
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171 | g_return_val_if_fail (cmp != NULL, NULL); |
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172 | g_return_val_if_fail (prefix != NULL, NULL); |
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173 | |
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174 | len = strlen (prefix); |
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175 | if (cmp->prefix && cmp->cache) |
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176 | { |
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177 | plen = strlen (cmp->prefix); |
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178 | if (plen <= len && !strncmp (prefix, cmp->prefix, plen)) |
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179 | { |
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180 | /* use the cache */ |
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181 | list = cmp->cache; |
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182 | while (list) |
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183 | { |
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184 | if (strncmp (prefix, |
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185 | cmp->func ? cmp->func (list->data) : (gchar*) list->data, |
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186 | len)) |
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187 | { |
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188 | list = g_list_remove_link (cmp->cache, list); |
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189 | if (list != cmp->cache) |
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190 | cmp->cache = list; |
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191 | } |
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192 | else |
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193 | list = list->next; |
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194 | } |
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195 | done = 1; |
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196 | } |
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197 | } |
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198 | |
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199 | if (!done) |
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200 | { |
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201 | /* normal code */ |
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202 | g_list_free (cmp->cache); |
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203 | cmp->cache = NULL; |
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204 | list = cmp->items; |
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205 | while (*prefix && list) |
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206 | { |
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207 | if (!strncmp (prefix, |
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208 | cmp->func ? cmp->func (list->data) : (gchar*) list->data, |
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209 | len)) |
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210 | cmp->cache = g_list_prepend (cmp->cache, list->data); |
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211 | list = list->next; |
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212 | } |
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213 | } |
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214 | if (cmp->prefix) |
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215 | { |
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216 | g_free (cmp->prefix); |
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217 | cmp->prefix = NULL; |
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218 | } |
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219 | if (cmp->cache) |
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220 | cmp->prefix = g_strdup (prefix); |
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221 | completion_check_cache (cmp, new_prefix); |
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222 | |
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223 | return *prefix ? cmp->cache : cmp->items; |
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224 | } |
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225 | |
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226 | void |
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227 | g_completion_free (GCompletion* cmp) |
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228 | { |
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229 | g_return_if_fail (cmp != NULL); |
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230 | |
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231 | g_completion_clear_items (cmp); |
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232 | g_free (cmp); |
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233 | } |
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234 | |
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235 | #ifdef TEST_COMPLETION |
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236 | #include <stdio.h> |
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237 | int |
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238 | main (int argc, |
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239 | char* argv[]) |
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240 | { |
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241 | FILE *file; |
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242 | gchar buf[1024]; |
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243 | GList *list; |
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244 | GList *result; |
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245 | GList *tmp; |
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246 | GCompletion *cmp; |
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247 | gint i; |
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248 | gchar *longp = NULL; |
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249 | |
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250 | if (argc < 3) |
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251 | { |
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252 | g_warning ("Usage: %s filename prefix1 [prefix2 ...]\n", argv[0]); |
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253 | return 1; |
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254 | } |
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255 | |
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256 | file = fopen (argv[1], "r"); |
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257 | if (!file) |
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258 | { |
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259 | g_warning ("Cannot open %s\n", argv[1]); |
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260 | return 1; |
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261 | } |
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262 | |
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263 | cmp = g_completion_new (NULL); |
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264 | list = g_list_alloc (); |
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265 | while (fgets (buf, 1024, file)) |
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266 | { |
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267 | list->data = g_strdup (buf); |
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268 | g_completion_add_items (cmp, list); |
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269 | } |
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270 | fclose (file); |
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271 | |
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272 | for (i = 2; i < argc; ++i) |
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273 | { |
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274 | printf ("COMPLETING: %s\n", argv[i]); |
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275 | result = g_completion_complete (cmp, argv[i], &longp); |
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276 | g_list_foreach (result, (GFunc) printf, NULL); |
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277 | printf ("LONG MATCH: %s\n", longp); |
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278 | g_free (longp); |
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279 | longp = NULL; |
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280 | } |
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281 | |
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282 | g_list_foreach (cmp->items, (GFunc) g_free, NULL); |
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283 | g_completion_free (cmp); |
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284 | g_list_free (list); |
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285 | |
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286 | return 0; |
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287 | } |
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288 | #endif |
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