1 | /* |
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2 | * tclListObj.c -- |
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3 | * |
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4 | * This file contains procedures that implement the Tcl list object |
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5 | * type. |
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6 | * |
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7 | * Copyright (c) 1995-1997 Sun Microsystems, Inc. |
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8 | * Copyright (c) 1998 by Scriptics Corporation. |
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9 | * |
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10 | * See the file "license.terms" for information on usage and redistribution |
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11 | * of this file, and for a DISCLAIMER OF ALL WARRANTIES. |
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12 | * |
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13 | * RCS: @(#) $Id: tclListObj.c,v 1.1 2008-06-04 13:58:07 demin Exp $ |
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14 | */ |
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15 | |
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16 | #include "tclInt.h" |
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17 | |
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18 | /* |
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19 | * Prototypes for procedures defined later in this file: |
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20 | */ |
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21 | |
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22 | static void DupListInternalRep _ANSI_ARGS_((Tcl_Obj *srcPtr, |
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23 | Tcl_Obj *copyPtr)); |
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24 | static void FreeListInternalRep _ANSI_ARGS_((Tcl_Obj *listPtr)); |
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25 | static int SetListFromAny _ANSI_ARGS_((Tcl_Interp *interp, |
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26 | Tcl_Obj *objPtr)); |
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27 | static void UpdateStringOfList _ANSI_ARGS_((Tcl_Obj *listPtr)); |
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28 | |
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29 | /* |
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30 | * The structure below defines the list Tcl object type by means of |
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31 | * procedures that can be invoked by generic object code. |
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32 | */ |
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33 | |
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34 | Tcl_ObjType tclListType = { |
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35 | "list", /* name */ |
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36 | FreeListInternalRep, /* freeIntRepProc */ |
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37 | DupListInternalRep, /* dupIntRepProc */ |
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38 | UpdateStringOfList, /* updateStringProc */ |
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39 | SetListFromAny /* setFromAnyProc */ |
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40 | }; |
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41 | |
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42 | /* |
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43 | *---------------------------------------------------------------------- |
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44 | * |
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45 | * Tcl_NewListObj -- |
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46 | * |
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47 | * This procedure is normally called when not debugging: i.e., when |
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48 | * TCL_MEM_DEBUG is not defined. It creates a new list object from an |
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49 | * (objc,objv) array: that is, each of the objc elements of the array |
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50 | * referenced by objv is inserted as an element into a new Tcl object. |
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51 | * |
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52 | * When TCL_MEM_DEBUG is defined, this procedure just returns the |
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53 | * result of calling the debugging version Tcl_DbNewListObj. |
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54 | * |
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55 | * Results: |
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56 | * A new list object is returned that is initialized from the object |
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57 | * pointers in objv. If objc is less than or equal to zero, an empty |
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58 | * object is returned. The new object's string representation |
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59 | * is left NULL. The resulting new list object has ref count 0. |
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60 | * |
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61 | * Side effects: |
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62 | * The ref counts of the elements in objv are incremented since the |
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63 | * resulting list now refers to them. |
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64 | * |
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65 | *---------------------------------------------------------------------- |
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66 | */ |
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67 | |
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68 | #ifdef TCL_MEM_DEBUG |
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69 | #undef Tcl_NewListObj |
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70 | |
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71 | Tcl_Obj * |
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72 | Tcl_NewListObj(objc, objv) |
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73 | int objc; /* Count of objects referenced by objv. */ |
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74 | Tcl_Obj *CONST objv[]; /* An array of pointers to Tcl objects. */ |
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75 | { |
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76 | return Tcl_DbNewListObj(objc, objv, "unknown", 0); |
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77 | } |
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78 | |
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79 | #else /* if not TCL_MEM_DEBUG */ |
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80 | |
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81 | Tcl_Obj * |
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82 | Tcl_NewListObj(objc, objv) |
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83 | int objc; /* Count of objects referenced by objv. */ |
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84 | Tcl_Obj *CONST objv[]; /* An array of pointers to Tcl objects. */ |
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85 | { |
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86 | register Tcl_Obj *listPtr; |
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87 | register Tcl_Obj **elemPtrs; |
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88 | register List *listRepPtr; |
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89 | int i; |
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90 | |
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91 | TclNewObj(listPtr); |
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92 | |
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93 | if (objc > 0) { |
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94 | Tcl_InvalidateStringRep(listPtr); |
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95 | |
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96 | elemPtrs = (Tcl_Obj **) |
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97 | ckalloc((unsigned) (objc * sizeof(Tcl_Obj *))); |
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98 | for (i = 0; i < objc; i++) { |
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99 | elemPtrs[i] = objv[i]; |
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100 | Tcl_IncrRefCount(elemPtrs[i]); |
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101 | } |
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102 | |
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103 | listRepPtr = (List *) ckalloc(sizeof(List)); |
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104 | listRepPtr->maxElemCount = objc; |
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105 | listRepPtr->elemCount = objc; |
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106 | listRepPtr->elements = elemPtrs; |
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107 | |
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108 | listPtr->internalRep.otherValuePtr = (VOID *) listRepPtr; |
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109 | listPtr->typePtr = &tclListType; |
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110 | } |
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111 | return listPtr; |
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112 | } |
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113 | #endif /* if TCL_MEM_DEBUG */ |
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114 | |
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115 | /* |
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116 | *---------------------------------------------------------------------- |
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117 | * |
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118 | * Tcl_DbNewListObj -- |
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119 | * |
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120 | * This procedure is normally called when debugging: i.e., when |
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121 | * TCL_MEM_DEBUG is defined. It creates new list objects. It is the |
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122 | * same as the Tcl_NewListObj procedure above except that it calls |
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123 | * Tcl_DbCkalloc directly with the file name and line number from its |
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124 | * caller. This simplifies debugging since then the checkmem command |
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125 | * will report the correct file name and line number when reporting |
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126 | * objects that haven't been freed. |
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127 | * |
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128 | * When TCL_MEM_DEBUG is not defined, this procedure just returns the |
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129 | * result of calling Tcl_NewListObj. |
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130 | * |
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131 | * Results: |
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132 | * A new list object is returned that is initialized from the object |
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133 | * pointers in objv. If objc is less than or equal to zero, an empty |
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134 | * object is returned. The new object's string representation |
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135 | * is left NULL. The new list object has ref count 0. |
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136 | * |
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137 | * Side effects: |
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138 | * The ref counts of the elements in objv are incremented since the |
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139 | * resulting list now refers to them. |
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140 | * |
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141 | *---------------------------------------------------------------------- |
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142 | */ |
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143 | |
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144 | #ifdef TCL_MEM_DEBUG |
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145 | |
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146 | Tcl_Obj * |
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147 | Tcl_DbNewListObj(objc, objv, file, line) |
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148 | int objc; /* Count of objects referenced by objv. */ |
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149 | Tcl_Obj *CONST objv[]; /* An array of pointers to Tcl objects. */ |
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150 | char *file; /* The name of the source file calling this |
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151 | * procedure; used for debugging. */ |
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152 | int line; /* Line number in the source file; used |
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153 | * for debugging. */ |
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154 | { |
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155 | register Tcl_Obj *listPtr; |
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156 | register Tcl_Obj **elemPtrs; |
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157 | register List *listRepPtr; |
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158 | int i; |
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159 | |
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160 | TclDbNewObj(listPtr, file, line); |
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161 | |
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162 | if (objc > 0) { |
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163 | Tcl_InvalidateStringRep(listPtr); |
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164 | |
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165 | elemPtrs = (Tcl_Obj **) |
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166 | ckalloc((unsigned) (objc * sizeof(Tcl_Obj *))); |
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167 | for (i = 0; i < objc; i++) { |
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168 | elemPtrs[i] = objv[i]; |
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169 | Tcl_IncrRefCount(elemPtrs[i]); |
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170 | } |
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171 | |
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172 | listRepPtr = (List *) ckalloc(sizeof(List)); |
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173 | listRepPtr->maxElemCount = objc; |
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174 | listRepPtr->elemCount = objc; |
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175 | listRepPtr->elements = elemPtrs; |
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176 | |
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177 | listPtr->internalRep.otherValuePtr = (VOID *) listRepPtr; |
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178 | listPtr->typePtr = &tclListType; |
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179 | } |
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180 | return listPtr; |
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181 | } |
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182 | |
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183 | #else /* if not TCL_MEM_DEBUG */ |
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184 | |
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185 | Tcl_Obj * |
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186 | Tcl_DbNewListObj(objc, objv, file, line) |
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187 | int objc; /* Count of objects referenced by objv. */ |
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188 | Tcl_Obj *CONST objv[]; /* An array of pointers to Tcl objects. */ |
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189 | char *file; /* The name of the source file calling this |
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190 | * procedure; used for debugging. */ |
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191 | int line; /* Line number in the source file; used |
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192 | * for debugging. */ |
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193 | { |
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194 | return Tcl_NewListObj(objc, objv); |
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195 | } |
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196 | #endif /* TCL_MEM_DEBUG */ |
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197 | |
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198 | /* |
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199 | *---------------------------------------------------------------------- |
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200 | * |
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201 | * Tcl_SetListObj -- |
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202 | * |
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203 | * Modify an object to be a list containing each of the objc elements |
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204 | * of the object array referenced by objv. |
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205 | * |
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206 | * Results: |
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207 | * None. |
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208 | * |
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209 | * Side effects: |
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210 | * The object is made a list object and is initialized from the object |
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211 | * pointers in objv. If objc is less than or equal to zero, an empty |
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212 | * object is returned. The new object's string representation |
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213 | * is left NULL. The ref counts of the elements in objv are incremented |
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214 | * since the list now refers to them. The object's old string and |
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215 | * internal representations are freed and its type is set NULL. |
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216 | * |
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217 | *---------------------------------------------------------------------- |
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218 | */ |
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219 | |
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220 | void |
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221 | Tcl_SetListObj(objPtr, objc, objv) |
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222 | Tcl_Obj *objPtr; /* Object whose internal rep to init. */ |
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223 | int objc; /* Count of objects referenced by objv. */ |
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224 | Tcl_Obj *CONST objv[]; /* An array of pointers to Tcl objects. */ |
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225 | { |
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226 | register Tcl_Obj **elemPtrs; |
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227 | register List *listRepPtr; |
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228 | Tcl_ObjType *oldTypePtr = objPtr->typePtr; |
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229 | int i; |
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230 | |
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231 | if (Tcl_IsShared(objPtr)) { |
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232 | panic("Tcl_SetListObj called with shared object"); |
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233 | } |
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234 | |
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235 | /* |
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236 | * Free any old string rep and any internal rep for the old type. |
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237 | */ |
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238 | |
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239 | Tcl_InvalidateStringRep(objPtr); |
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240 | if ((oldTypePtr != NULL) && (oldTypePtr->freeIntRepProc != NULL)) { |
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241 | oldTypePtr->freeIntRepProc(objPtr); |
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242 | objPtr->typePtr = NULL; |
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243 | } |
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244 | |
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245 | /* |
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246 | * Set the object's type to "list" and initialize the internal rep. |
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247 | */ |
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248 | |
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249 | if (objc > 0) { |
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250 | elemPtrs = (Tcl_Obj **) |
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251 | ckalloc((unsigned) (objc * sizeof(Tcl_Obj *))); |
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252 | for (i = 0; i < objc; i++) { |
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253 | elemPtrs[i] = objv[i]; |
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254 | Tcl_IncrRefCount(elemPtrs[i]); |
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255 | } |
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256 | |
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257 | listRepPtr = (List *) ckalloc(sizeof(List)); |
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258 | listRepPtr->maxElemCount = objc; |
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259 | listRepPtr->elemCount = objc; |
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260 | listRepPtr->elements = elemPtrs; |
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261 | |
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262 | objPtr->internalRep.otherValuePtr = (VOID *) listRepPtr; |
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263 | objPtr->typePtr = &tclListType; |
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264 | } else { |
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265 | objPtr->bytes = tclEmptyStringRep; |
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266 | } |
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267 | } |
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268 | |
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269 | /* |
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270 | *---------------------------------------------------------------------- |
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271 | * |
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272 | * Tcl_ListObjGetElements -- |
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273 | * |
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274 | * This procedure returns an (objc,objv) array of the elements in a |
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275 | * list object. |
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276 | * |
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277 | * Results: |
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278 | * The return value is normally TCL_OK; in this case *objcPtr is set to |
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279 | * the count of list elements and *objvPtr is set to a pointer to an |
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280 | * array of (*objcPtr) pointers to each list element. If listPtr does |
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281 | * not refer to a list object and the object can not be converted to |
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282 | * one, TCL_ERROR is returned and an error message will be left in |
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283 | * the interpreter's result if interp is not NULL. |
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284 | * |
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285 | * The objects referenced by the returned array should be treated as |
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286 | * readonly and their ref counts are _not_ incremented; the caller must |
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287 | * do that if it holds on to a reference. Furthermore, the pointer |
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288 | * and length returned by this procedure may change as soon as any |
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289 | * procedure is called on the list object; be careful about retaining |
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290 | * the pointer in a local data structure. |
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291 | * |
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292 | * Side effects: |
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293 | * The possible conversion of the object referenced by listPtr |
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294 | * to a list object. |
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295 | * |
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296 | *---------------------------------------------------------------------- |
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297 | */ |
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298 | |
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299 | int |
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300 | Tcl_ListObjGetElements(interp, listPtr, objcPtr, objvPtr) |
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301 | Tcl_Interp *interp; /* Used to report errors if not NULL. */ |
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302 | register Tcl_Obj *listPtr; /* List object for which an element array |
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303 | * is to be returned. */ |
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304 | int *objcPtr; /* Where to store the count of objects |
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305 | * referenced by objv. */ |
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306 | Tcl_Obj ***objvPtr; /* Where to store the pointer to an array |
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307 | * of pointers to the list's objects. */ |
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308 | { |
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309 | register List *listRepPtr; |
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310 | |
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311 | if (listPtr->typePtr != &tclListType) { |
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312 | int result = SetListFromAny(interp, listPtr); |
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313 | if (result != TCL_OK) { |
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314 | return result; |
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315 | } |
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316 | } |
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317 | listRepPtr = (List *) listPtr->internalRep.otherValuePtr; |
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318 | *objcPtr = listRepPtr->elemCount; |
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319 | *objvPtr = listRepPtr->elements; |
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320 | return TCL_OK; |
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321 | } |
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322 | |
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323 | /* |
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324 | *---------------------------------------------------------------------- |
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325 | * |
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326 | * Tcl_ListObjAppendList -- |
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327 | * |
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328 | * This procedure appends the objects in the list referenced by |
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329 | * elemListPtr to the list object referenced by listPtr. If listPtr is |
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330 | * not already a list object, an attempt will be made to convert it to |
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331 | * one. |
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332 | * |
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333 | * Results: |
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334 | * The return value is normally TCL_OK. If listPtr or elemListPtr do |
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335 | * not refer to list objects and they can not be converted to one, |
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336 | * TCL_ERROR is returned and an error message is left in |
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337 | * the interpreter's result if interp is not NULL. |
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338 | * |
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339 | * Side effects: |
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340 | * The reference counts of the elements in elemListPtr are incremented |
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341 | * since the list now refers to them. listPtr and elemListPtr are |
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342 | * converted, if necessary, to list objects. Also, appending the |
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343 | * new elements may cause listObj's array of element pointers to grow. |
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344 | * listPtr's old string representation, if any, is invalidated. |
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345 | * |
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346 | *---------------------------------------------------------------------- |
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347 | */ |
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348 | |
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349 | int |
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350 | Tcl_ListObjAppendList(interp, listPtr, elemListPtr) |
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351 | Tcl_Interp *interp; /* Used to report errors if not NULL. */ |
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352 | register Tcl_Obj *listPtr; /* List object to append elements to. */ |
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353 | Tcl_Obj *elemListPtr; /* List obj with elements to append. */ |
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354 | { |
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355 | register List *listRepPtr; |
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356 | int listLen, objc, result; |
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357 | Tcl_Obj **objv; |
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358 | |
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359 | if (Tcl_IsShared(listPtr)) { |
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360 | panic("Tcl_ListObjAppendList called with shared object"); |
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361 | } |
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362 | if (listPtr->typePtr != &tclListType) { |
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363 | result = SetListFromAny(interp, listPtr); |
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364 | if (result != TCL_OK) { |
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365 | return result; |
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366 | } |
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367 | } |
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368 | listRepPtr = (List *) listPtr->internalRep.otherValuePtr; |
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369 | listLen = listRepPtr->elemCount; |
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370 | |
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371 | result = Tcl_ListObjGetElements(interp, elemListPtr, &objc, &objv); |
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372 | if (result != TCL_OK) { |
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373 | return result; |
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374 | } |
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375 | |
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376 | /* |
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377 | * Insert objc new elements starting after the lists's last element. |
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378 | * Delete zero existing elements. |
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379 | */ |
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380 | |
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381 | return Tcl_ListObjReplace(interp, listPtr, listLen, 0, objc, objv); |
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382 | } |
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383 | |
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384 | /* |
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385 | *---------------------------------------------------------------------- |
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386 | * |
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387 | * Tcl_ListObjAppendElement -- |
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388 | * |
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389 | * This procedure is a special purpose version of |
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390 | * Tcl_ListObjAppendList: it appends a single object referenced by |
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391 | * objPtr to the list object referenced by listPtr. If listPtr is not |
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392 | * already a list object, an attempt will be made to convert it to one. |
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393 | * |
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394 | * Results: |
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395 | * The return value is normally TCL_OK; in this case objPtr is added |
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396 | * to the end of listPtr's list. If listPtr does not refer to a list |
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397 | * object and the object can not be converted to one, TCL_ERROR is |
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398 | * returned and an error message will be left in the interpreter's |
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399 | * result if interp is not NULL. |
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400 | * |
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401 | * Side effects: |
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402 | * The ref count of objPtr is incremented since the list now refers |
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403 | * to it. listPtr will be converted, if necessary, to a list object. |
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404 | * Also, appending the new element may cause listObj's array of element |
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405 | * pointers to grow. listPtr's old string representation, if any, |
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406 | * is invalidated. |
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407 | * |
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408 | *---------------------------------------------------------------------- |
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409 | */ |
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410 | |
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411 | int |
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412 | Tcl_ListObjAppendElement(interp, listPtr, objPtr) |
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413 | Tcl_Interp *interp; /* Used to report errors if not NULL. */ |
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414 | Tcl_Obj *listPtr; /* List object to append objPtr to. */ |
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415 | Tcl_Obj *objPtr; /* Object to append to listPtr's list. */ |
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416 | { |
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417 | register List *listRepPtr; |
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418 | register Tcl_Obj **elemPtrs; |
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419 | int numElems, numRequired; |
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420 | |
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421 | if (Tcl_IsShared(listPtr)) { |
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422 | panic("Tcl_ListObjAppendElement called with shared object"); |
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423 | } |
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424 | if (listPtr->typePtr != &tclListType) { |
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425 | int result = SetListFromAny(interp, listPtr); |
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426 | if (result != TCL_OK) { |
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427 | return result; |
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428 | } |
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429 | } |
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430 | |
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431 | listRepPtr = (List *) listPtr->internalRep.otherValuePtr; |
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432 | elemPtrs = listRepPtr->elements; |
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433 | numElems = listRepPtr->elemCount; |
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434 | numRequired = numElems + 1 ; |
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435 | |
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436 | /* |
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437 | * If there is no room in the current array of element pointers, |
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438 | * allocate a new, larger array and copy the pointers to it. |
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439 | */ |
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440 | |
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441 | if (numRequired > listRepPtr->maxElemCount) { |
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442 | int newMax = (2 * numRequired); |
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443 | Tcl_Obj **newElemPtrs = (Tcl_Obj **) |
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444 | ckalloc((unsigned) (newMax * sizeof(Tcl_Obj *))); |
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445 | |
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446 | memcpy((VOID *) newElemPtrs, (VOID *) elemPtrs, |
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447 | (size_t) (numElems * sizeof(Tcl_Obj *))); |
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448 | |
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449 | listRepPtr->maxElemCount = newMax; |
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450 | listRepPtr->elements = newElemPtrs; |
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451 | ckfree((char *) elemPtrs); |
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452 | elemPtrs = newElemPtrs; |
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453 | } |
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454 | |
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455 | /* |
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456 | * Add objPtr to the end of listPtr's array of element |
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457 | * pointers. Increment the ref count for the (now shared) objPtr. |
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458 | */ |
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459 | |
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460 | elemPtrs[numElems] = objPtr; |
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461 | Tcl_IncrRefCount(objPtr); |
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462 | listRepPtr->elemCount++; |
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463 | |
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464 | /* |
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465 | * Invalidate any old string representation since the list's internal |
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466 | * representation has changed. |
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467 | */ |
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468 | |
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469 | Tcl_InvalidateStringRep(listPtr); |
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470 | return TCL_OK; |
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471 | } |
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472 | |
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473 | /* |
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474 | *---------------------------------------------------------------------- |
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475 | * |
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476 | * Tcl_ListObjIndex -- |
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477 | * |
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478 | * This procedure returns a pointer to the index'th object from the |
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479 | * list referenced by listPtr. The first element has index 0. If index |
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480 | * is negative or greater than or equal to the number of elements in |
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481 | * the list, a NULL is returned. If listPtr is not a list object, an |
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482 | * attempt will be made to convert it to a list. |
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483 | * |
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484 | * Results: |
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485 | * The return value is normally TCL_OK; in this case objPtrPtr is set |
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486 | * to the Tcl_Obj pointer for the index'th list element or NULL if |
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487 | * index is out of range. This object should be treated as readonly and |
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488 | * its ref count is _not_ incremented; the caller must do that if it |
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489 | * holds on to the reference. If listPtr does not refer to a list and |
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490 | * can't be converted to one, TCL_ERROR is returned and an error |
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491 | * message is left in the interpreter's result if interp is not NULL. |
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492 | * |
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493 | * Side effects: |
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494 | * listPtr will be converted, if necessary, to a list object. |
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495 | * |
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496 | *---------------------------------------------------------------------- |
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497 | */ |
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498 | |
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499 | int |
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500 | Tcl_ListObjIndex(interp, listPtr, index, objPtrPtr) |
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501 | Tcl_Interp *interp; /* Used to report errors if not NULL. */ |
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502 | register Tcl_Obj *listPtr; /* List object to index into. */ |
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503 | register int index; /* Index of element to return. */ |
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504 | Tcl_Obj **objPtrPtr; /* The resulting Tcl_Obj* is stored here. */ |
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505 | { |
---|
506 | register List *listRepPtr; |
---|
507 | |
---|
508 | if (listPtr->typePtr != &tclListType) { |
---|
509 | int result = SetListFromAny(interp, listPtr); |
---|
510 | if (result != TCL_OK) { |
---|
511 | return result; |
---|
512 | } |
---|
513 | } |
---|
514 | |
---|
515 | listRepPtr = (List *) listPtr->internalRep.otherValuePtr; |
---|
516 | if ((index < 0) || (index >= listRepPtr->elemCount)) { |
---|
517 | *objPtrPtr = NULL; |
---|
518 | } else { |
---|
519 | *objPtrPtr = listRepPtr->elements[index]; |
---|
520 | } |
---|
521 | |
---|
522 | return TCL_OK; |
---|
523 | } |
---|
524 | |
---|
525 | /* |
---|
526 | *---------------------------------------------------------------------- |
---|
527 | * |
---|
528 | * Tcl_ListObjLength -- |
---|
529 | * |
---|
530 | * This procedure returns the number of elements in a list object. If |
---|
531 | * the object is not already a list object, an attempt will be made to |
---|
532 | * convert it to one. |
---|
533 | * |
---|
534 | * Results: |
---|
535 | * The return value is normally TCL_OK; in this case *intPtr will be |
---|
536 | * set to the integer count of list elements. If listPtr does not refer |
---|
537 | * to a list object and the object can not be converted to one, |
---|
538 | * TCL_ERROR is returned and an error message will be left in |
---|
539 | * the interpreter's result if interp is not NULL. |
---|
540 | * |
---|
541 | * Side effects: |
---|
542 | * The possible conversion of the argument object to a list object. |
---|
543 | * |
---|
544 | *---------------------------------------------------------------------- |
---|
545 | */ |
---|
546 | |
---|
547 | int |
---|
548 | Tcl_ListObjLength(interp, listPtr, intPtr) |
---|
549 | Tcl_Interp *interp; /* Used to report errors if not NULL. */ |
---|
550 | register Tcl_Obj *listPtr; /* List object whose #elements to return. */ |
---|
551 | register int *intPtr; /* The resulting int is stored here. */ |
---|
552 | { |
---|
553 | register List *listRepPtr; |
---|
554 | |
---|
555 | if (listPtr->typePtr != &tclListType) { |
---|
556 | int result = SetListFromAny(interp, listPtr); |
---|
557 | if (result != TCL_OK) { |
---|
558 | return result; |
---|
559 | } |
---|
560 | } |
---|
561 | |
---|
562 | listRepPtr = (List *) listPtr->internalRep.otherValuePtr; |
---|
563 | *intPtr = listRepPtr->elemCount; |
---|
564 | return TCL_OK; |
---|
565 | } |
---|
566 | |
---|
567 | /* |
---|
568 | *---------------------------------------------------------------------- |
---|
569 | * |
---|
570 | * Tcl_ListObjReplace -- |
---|
571 | * |
---|
572 | * This procedure replaces zero or more elements of the list referenced |
---|
573 | * by listPtr with the objects from an (objc,objv) array. |
---|
574 | * The objc elements of the array referenced by objv replace the |
---|
575 | * count elements in listPtr starting at first. |
---|
576 | * |
---|
577 | * If the argument first is zero or negative, it refers to the first |
---|
578 | * element. If first is greater than or equal to the number of elements |
---|
579 | * in the list, then no elements are deleted; the new elements are |
---|
580 | * appended to the list. Count gives the number of elements to |
---|
581 | * replace. If count is zero or negative then no elements are deleted; |
---|
582 | * the new elements are simply inserted before first. |
---|
583 | * |
---|
584 | * The argument objv refers to an array of objc pointers to the new |
---|
585 | * elements to be added to listPtr in place of those that were |
---|
586 | * deleted. If objv is NULL, no new elements are added. If listPtr is |
---|
587 | * not a list object, an attempt will be made to convert it to one. |
---|
588 | * |
---|
589 | * Results: |
---|
590 | * The return value is normally TCL_OK. If listPtr does |
---|
591 | * not refer to a list object and can not be converted to one, |
---|
592 | * TCL_ERROR is returned and an error message will be left in |
---|
593 | * the interpreter's result if interp is not NULL. |
---|
594 | * |
---|
595 | * Side effects: |
---|
596 | * The ref counts of the objc elements in objv are incremented since |
---|
597 | * the resulting list now refers to them. Similarly, the ref counts for |
---|
598 | * replaced objects are decremented. listPtr is converted, if |
---|
599 | * necessary, to a list object. listPtr's old string representation, if |
---|
600 | * any, is freed. |
---|
601 | * |
---|
602 | *---------------------------------------------------------------------- |
---|
603 | */ |
---|
604 | |
---|
605 | int |
---|
606 | Tcl_ListObjReplace(interp, listPtr, first, count, objc, objv) |
---|
607 | Tcl_Interp *interp; /* Used for error reporting if not NULL. */ |
---|
608 | Tcl_Obj *listPtr; /* List object whose elements to replace. */ |
---|
609 | int first; /* Index of first element to replace. */ |
---|
610 | int count; /* Number of elements to replace. */ |
---|
611 | int objc; /* Number of objects to insert. */ |
---|
612 | Tcl_Obj *CONST objv[]; /* An array of objc pointers to Tcl objects |
---|
613 | * to insert. */ |
---|
614 | { |
---|
615 | List *listRepPtr; |
---|
616 | register Tcl_Obj **elemPtrs, **newPtrs; |
---|
617 | Tcl_Obj *victimPtr; |
---|
618 | int numElems, numRequired, numAfterLast; |
---|
619 | int start, shift, newMax, i, j, result; |
---|
620 | |
---|
621 | if (Tcl_IsShared(listPtr)) { |
---|
622 | panic("Tcl_ListObjReplace called with shared object"); |
---|
623 | } |
---|
624 | if (listPtr->typePtr != &tclListType) { |
---|
625 | result = SetListFromAny(interp, listPtr); |
---|
626 | if (result != TCL_OK) { |
---|
627 | return result; |
---|
628 | } |
---|
629 | } |
---|
630 | listRepPtr = (List *) listPtr->internalRep.otherValuePtr; |
---|
631 | elemPtrs = listRepPtr->elements; |
---|
632 | numElems = listRepPtr->elemCount; |
---|
633 | |
---|
634 | if (first < 0) { |
---|
635 | first = 0; |
---|
636 | } |
---|
637 | if (first >= numElems) { |
---|
638 | first = numElems; /* so we'll insert after last element */ |
---|
639 | } |
---|
640 | if (count < 0) { |
---|
641 | count = 0; |
---|
642 | } |
---|
643 | |
---|
644 | numRequired = (numElems - count + objc); |
---|
645 | if (numRequired <= listRepPtr->maxElemCount) { |
---|
646 | /* |
---|
647 | * Enough room in the current array. First "delete" count |
---|
648 | * elements starting at first. |
---|
649 | */ |
---|
650 | |
---|
651 | for (i = 0, j = first; i < count; i++, j++) { |
---|
652 | victimPtr = elemPtrs[j]; |
---|
653 | TclDecrRefCount(victimPtr); |
---|
654 | } |
---|
655 | |
---|
656 | /* |
---|
657 | * Shift the elements after the last one removed to their |
---|
658 | * new locations. |
---|
659 | */ |
---|
660 | |
---|
661 | start = (first + count); |
---|
662 | numAfterLast = (numElems - start); |
---|
663 | shift = (objc - count); /* numNewElems - numDeleted */ |
---|
664 | if ((numAfterLast > 0) && (shift != 0)) { |
---|
665 | Tcl_Obj **src, **dst; |
---|
666 | |
---|
667 | if (shift < 0) { |
---|
668 | for (src = elemPtrs + start, dst = src + shift; |
---|
669 | numAfterLast > 0; numAfterLast--, src++, dst++) { |
---|
670 | *dst = *src; |
---|
671 | } |
---|
672 | } else { |
---|
673 | for (src = elemPtrs + numElems - 1, dst = src + shift; |
---|
674 | numAfterLast > 0; numAfterLast--, src--, dst--) { |
---|
675 | *dst = *src; |
---|
676 | } |
---|
677 | } |
---|
678 | } |
---|
679 | |
---|
680 | /* |
---|
681 | * Insert the new elements into elemPtrs before "first". |
---|
682 | */ |
---|
683 | |
---|
684 | for (i = 0, j = first; i < objc; i++, j++) { |
---|
685 | elemPtrs[j] = objv[i]; |
---|
686 | Tcl_IncrRefCount(objv[i]); |
---|
687 | } |
---|
688 | |
---|
689 | /* |
---|
690 | * Update the count of elements. |
---|
691 | */ |
---|
692 | |
---|
693 | listRepPtr->elemCount = numRequired; |
---|
694 | } else { |
---|
695 | /* |
---|
696 | * Not enough room in the current array. Allocate a larger array and |
---|
697 | * insert elements into it. |
---|
698 | */ |
---|
699 | |
---|
700 | newMax = (2 * numRequired); |
---|
701 | newPtrs = (Tcl_Obj **) |
---|
702 | ckalloc((unsigned) (newMax * sizeof(Tcl_Obj *))); |
---|
703 | |
---|
704 | /* |
---|
705 | * Copy over the elements before "first". |
---|
706 | */ |
---|
707 | |
---|
708 | if (first > 0) { |
---|
709 | memcpy((VOID *) newPtrs, (VOID *) elemPtrs, |
---|
710 | (size_t) (first * sizeof(Tcl_Obj *))); |
---|
711 | } |
---|
712 | |
---|
713 | /* |
---|
714 | * "Delete" count elements starting at first. |
---|
715 | */ |
---|
716 | |
---|
717 | for (i = 0, j = first; i < count; i++, j++) { |
---|
718 | victimPtr = elemPtrs[j]; |
---|
719 | TclDecrRefCount(victimPtr); |
---|
720 | } |
---|
721 | |
---|
722 | /* |
---|
723 | * Copy the elements after the last one removed, shifted to |
---|
724 | * their new locations. |
---|
725 | */ |
---|
726 | |
---|
727 | start = (first + count); |
---|
728 | numAfterLast = (numElems - start); |
---|
729 | if (numAfterLast > 0) { |
---|
730 | memcpy((VOID *) &(newPtrs[first + objc]), |
---|
731 | (VOID *) &(elemPtrs[start]), |
---|
732 | (size_t) (numAfterLast * sizeof(Tcl_Obj *))); |
---|
733 | } |
---|
734 | |
---|
735 | /* |
---|
736 | * Insert the new elements before "first" and update the |
---|
737 | * count of elements. |
---|
738 | */ |
---|
739 | |
---|
740 | for (i = 0, j = first; i < objc; i++, j++) { |
---|
741 | newPtrs[j] = objv[i]; |
---|
742 | Tcl_IncrRefCount(objv[i]); |
---|
743 | } |
---|
744 | |
---|
745 | listRepPtr->elemCount = numRequired; |
---|
746 | listRepPtr->maxElemCount = newMax; |
---|
747 | listRepPtr->elements = newPtrs; |
---|
748 | ckfree((char *) elemPtrs); |
---|
749 | } |
---|
750 | |
---|
751 | /* |
---|
752 | * Invalidate and free any old string representation since it no longer |
---|
753 | * reflects the list's internal representation. |
---|
754 | */ |
---|
755 | |
---|
756 | Tcl_InvalidateStringRep(listPtr); |
---|
757 | return TCL_OK; |
---|
758 | } |
---|
759 | |
---|
760 | /* |
---|
761 | *---------------------------------------------------------------------- |
---|
762 | * |
---|
763 | * FreeListInternalRep -- |
---|
764 | * |
---|
765 | * Deallocate the storage associated with a list object's internal |
---|
766 | * representation. |
---|
767 | * |
---|
768 | * Results: |
---|
769 | * None. |
---|
770 | * |
---|
771 | * Side effects: |
---|
772 | * Frees listPtr's List* internal representation and sets listPtr's |
---|
773 | * internalRep.otherValuePtr to NULL. Decrements the ref counts |
---|
774 | * of all element objects, which may free them. |
---|
775 | * |
---|
776 | *---------------------------------------------------------------------- |
---|
777 | */ |
---|
778 | |
---|
779 | static void |
---|
780 | FreeListInternalRep(listPtr) |
---|
781 | Tcl_Obj *listPtr; /* List object with internal rep to free. */ |
---|
782 | { |
---|
783 | register List *listRepPtr = (List *) listPtr->internalRep.otherValuePtr; |
---|
784 | register Tcl_Obj **elemPtrs = listRepPtr->elements; |
---|
785 | register Tcl_Obj *objPtr; |
---|
786 | int numElems = listRepPtr->elemCount; |
---|
787 | int i; |
---|
788 | |
---|
789 | for (i = 0; i < numElems; i++) { |
---|
790 | objPtr = elemPtrs[i]; |
---|
791 | Tcl_DecrRefCount(objPtr); |
---|
792 | } |
---|
793 | ckfree((char *) elemPtrs); |
---|
794 | ckfree((char *) listRepPtr); |
---|
795 | } |
---|
796 | |
---|
797 | /* |
---|
798 | *---------------------------------------------------------------------- |
---|
799 | * |
---|
800 | * DupListInternalRep -- |
---|
801 | * |
---|
802 | * Initialize the internal representation of a list Tcl_Obj to a |
---|
803 | * copy of the internal representation of an existing list object. |
---|
804 | * |
---|
805 | * Results: |
---|
806 | * None. |
---|
807 | * |
---|
808 | * Side effects: |
---|
809 | * "srcPtr"s list internal rep pointer should not be NULL and we assume |
---|
810 | * it is not NULL. We set "copyPtr"s internal rep to a pointer to a |
---|
811 | * newly allocated List structure that, in turn, points to "srcPtr"s |
---|
812 | * element objects. Those element objects are not actually copied but |
---|
813 | * are shared between "srcPtr" and "copyPtr". The ref count of each |
---|
814 | * element object is incremented. |
---|
815 | * |
---|
816 | *---------------------------------------------------------------------- |
---|
817 | */ |
---|
818 | |
---|
819 | static void |
---|
820 | DupListInternalRep(srcPtr, copyPtr) |
---|
821 | Tcl_Obj *srcPtr; /* Object with internal rep to copy. */ |
---|
822 | Tcl_Obj *copyPtr; /* Object with internal rep to set. */ |
---|
823 | { |
---|
824 | List *srcListRepPtr = (List *) srcPtr->internalRep.otherValuePtr; |
---|
825 | int numElems = srcListRepPtr->elemCount; |
---|
826 | int maxElems = srcListRepPtr->maxElemCount; |
---|
827 | register Tcl_Obj **srcElemPtrs = srcListRepPtr->elements; |
---|
828 | register Tcl_Obj **copyElemPtrs; |
---|
829 | register List *copyListRepPtr; |
---|
830 | int i; |
---|
831 | |
---|
832 | /* |
---|
833 | * Allocate a new List structure that points to "srcPtr"s element |
---|
834 | * objects. Increment the ref counts for those (now shared) element |
---|
835 | * objects. |
---|
836 | */ |
---|
837 | |
---|
838 | copyElemPtrs = (Tcl_Obj **) |
---|
839 | ckalloc((unsigned) maxElems * sizeof(Tcl_Obj *)); |
---|
840 | for (i = 0; i < numElems; i++) { |
---|
841 | copyElemPtrs[i] = srcElemPtrs[i]; |
---|
842 | Tcl_IncrRefCount(copyElemPtrs[i]); |
---|
843 | } |
---|
844 | |
---|
845 | copyListRepPtr = (List *) ckalloc(sizeof(List)); |
---|
846 | copyListRepPtr->maxElemCount = maxElems; |
---|
847 | copyListRepPtr->elemCount = numElems; |
---|
848 | copyListRepPtr->elements = copyElemPtrs; |
---|
849 | |
---|
850 | copyPtr->internalRep.otherValuePtr = (VOID *) copyListRepPtr; |
---|
851 | copyPtr->typePtr = &tclListType; |
---|
852 | } |
---|
853 | |
---|
854 | /* |
---|
855 | *---------------------------------------------------------------------- |
---|
856 | * |
---|
857 | * SetListFromAny -- |
---|
858 | * |
---|
859 | * Attempt to generate a list internal form for the Tcl object |
---|
860 | * "objPtr". |
---|
861 | * |
---|
862 | * Results: |
---|
863 | * The return value is TCL_OK or TCL_ERROR. If an error occurs during |
---|
864 | * conversion, an error message is left in the interpreter's result |
---|
865 | * unless "interp" is NULL. |
---|
866 | * |
---|
867 | * Side effects: |
---|
868 | * If no error occurs, a list is stored as "objPtr"s internal |
---|
869 | * representation. |
---|
870 | * |
---|
871 | *---------------------------------------------------------------------- |
---|
872 | */ |
---|
873 | |
---|
874 | static int |
---|
875 | SetListFromAny(interp, objPtr) |
---|
876 | Tcl_Interp *interp; /* Used for error reporting if not NULL. */ |
---|
877 | Tcl_Obj *objPtr; /* The object to convert. */ |
---|
878 | { |
---|
879 | Tcl_ObjType *oldTypePtr = objPtr->typePtr; |
---|
880 | char *string, *elemStart, *nextElem, *s; |
---|
881 | int lenRemain, length, estCount, elemSize, hasBrace, i, j, result; |
---|
882 | char *limit; /* Points just after string's last byte. */ |
---|
883 | register char *p; |
---|
884 | register Tcl_Obj **elemPtrs; |
---|
885 | register Tcl_Obj *elemPtr; |
---|
886 | List *listRepPtr; |
---|
887 | |
---|
888 | /* |
---|
889 | * Get the string representation. Make it up-to-date if necessary. |
---|
890 | */ |
---|
891 | |
---|
892 | string = TclGetStringFromObj(objPtr, &length); |
---|
893 | |
---|
894 | /* |
---|
895 | * Parse the string into separate string objects, and create a List |
---|
896 | * structure that points to the element string objects. We use a |
---|
897 | * modified version of Tcl_SplitList's implementation to avoid one |
---|
898 | * malloc and a string copy for each list element. First, estimate the |
---|
899 | * number of elements by counting the number of space characters in the |
---|
900 | * list. |
---|
901 | */ |
---|
902 | |
---|
903 | limit = (string + length); |
---|
904 | estCount = 1; |
---|
905 | for (p = string; p < limit; p++) { |
---|
906 | if (isspace(UCHAR(*p))) { |
---|
907 | estCount++; |
---|
908 | } |
---|
909 | } |
---|
910 | |
---|
911 | /* |
---|
912 | * Allocate a new List structure with enough room for "estCount" |
---|
913 | * elements. Each element is a pointer to a Tcl_Obj with the appropriate |
---|
914 | * string rep. The initial "estCount" elements are set using the |
---|
915 | * corresponding "argv" strings. |
---|
916 | */ |
---|
917 | |
---|
918 | elemPtrs = (Tcl_Obj **) |
---|
919 | ckalloc((unsigned) (estCount * sizeof(Tcl_Obj *))); |
---|
920 | for (p = string, lenRemain = length, i = 0; |
---|
921 | lenRemain > 0; |
---|
922 | p = nextElem, lenRemain = (limit - nextElem), i++) { |
---|
923 | result = TclFindElement(interp, p, lenRemain, &elemStart, &nextElem, |
---|
924 | &elemSize, &hasBrace); |
---|
925 | if (result != TCL_OK) { |
---|
926 | for (j = 0; j < i; j++) { |
---|
927 | elemPtr = elemPtrs[j]; |
---|
928 | Tcl_DecrRefCount(elemPtr); |
---|
929 | } |
---|
930 | ckfree((char *) elemPtrs); |
---|
931 | return result; |
---|
932 | } |
---|
933 | if (elemStart >= limit) { |
---|
934 | break; |
---|
935 | } |
---|
936 | if (i > estCount) { |
---|
937 | panic("SetListFromAny: bad size estimate for list"); |
---|
938 | } |
---|
939 | |
---|
940 | /* |
---|
941 | * Allocate a Tcl object for the element and initialize it from the |
---|
942 | * "elemSize" bytes starting at "elemStart". |
---|
943 | */ |
---|
944 | |
---|
945 | s = ckalloc((unsigned) elemSize + 1); |
---|
946 | if (hasBrace) { |
---|
947 | memcpy((VOID *) s, (VOID *) elemStart, (size_t) elemSize); |
---|
948 | s[elemSize] = 0; |
---|
949 | } else { |
---|
950 | elemSize = TclCopyAndCollapse(elemSize, elemStart, s); |
---|
951 | } |
---|
952 | |
---|
953 | TclNewObj(elemPtr); |
---|
954 | elemPtr->bytes = s; |
---|
955 | elemPtr->length = elemSize; |
---|
956 | elemPtrs[i] = elemPtr; |
---|
957 | Tcl_IncrRefCount(elemPtr); /* since list now holds ref to it */ |
---|
958 | } |
---|
959 | |
---|
960 | listRepPtr = (List *) ckalloc(sizeof(List)); |
---|
961 | listRepPtr->maxElemCount = estCount; |
---|
962 | listRepPtr->elemCount = i; |
---|
963 | listRepPtr->elements = elemPtrs; |
---|
964 | |
---|
965 | /* |
---|
966 | * Free the old internalRep before setting the new one. We do this as |
---|
967 | * late as possible to allow the conversion code, in particular |
---|
968 | * Tcl_GetStringFromObj, to use that old internalRep. |
---|
969 | */ |
---|
970 | |
---|
971 | if ((oldTypePtr != NULL) && (oldTypePtr->freeIntRepProc != NULL)) { |
---|
972 | oldTypePtr->freeIntRepProc(objPtr); |
---|
973 | } |
---|
974 | |
---|
975 | objPtr->internalRep.otherValuePtr = (VOID *) listRepPtr; |
---|
976 | objPtr->typePtr = &tclListType; |
---|
977 | return TCL_OK; |
---|
978 | } |
---|
979 | |
---|
980 | /* |
---|
981 | *---------------------------------------------------------------------- |
---|
982 | * |
---|
983 | * UpdateStringOfList -- |
---|
984 | * |
---|
985 | * Update the string representation for a list object. |
---|
986 | * Note: This procedure does not invalidate an existing old string rep |
---|
987 | * so storage will be lost if this has not already been done. |
---|
988 | * |
---|
989 | * Results: |
---|
990 | * None. |
---|
991 | * |
---|
992 | * Side effects: |
---|
993 | * The object's string is set to a valid string that results from |
---|
994 | * the list-to-string conversion. This string will be empty if the |
---|
995 | * list has no elements. The list internal representation |
---|
996 | * should not be NULL and we assume it is not NULL. |
---|
997 | * |
---|
998 | *---------------------------------------------------------------------- |
---|
999 | */ |
---|
1000 | |
---|
1001 | static void |
---|
1002 | UpdateStringOfList(listPtr) |
---|
1003 | Tcl_Obj *listPtr; /* List object with string rep to update. */ |
---|
1004 | { |
---|
1005 | # define LOCAL_SIZE 20 |
---|
1006 | int localFlags[LOCAL_SIZE], *flagPtr; |
---|
1007 | List *listRepPtr = (List *) listPtr->internalRep.otherValuePtr; |
---|
1008 | int numElems = listRepPtr->elemCount; |
---|
1009 | register int i; |
---|
1010 | char *elem, *dst; |
---|
1011 | int length; |
---|
1012 | |
---|
1013 | /* |
---|
1014 | * Convert each element of the list to string form and then convert it |
---|
1015 | * to proper list element form, adding it to the result buffer. |
---|
1016 | */ |
---|
1017 | |
---|
1018 | /* |
---|
1019 | * Pass 1: estimate space, gather flags. |
---|
1020 | */ |
---|
1021 | |
---|
1022 | if (numElems <= LOCAL_SIZE) { |
---|
1023 | flagPtr = localFlags; |
---|
1024 | } else { |
---|
1025 | flagPtr = (int *) ckalloc((unsigned) numElems*sizeof(int)); |
---|
1026 | } |
---|
1027 | listPtr->length = 1; |
---|
1028 | for (i = 0; i < numElems; i++) { |
---|
1029 | elem = Tcl_GetStringFromObj(listRepPtr->elements[i], &length); |
---|
1030 | listPtr->length += Tcl_ScanCountedElement(elem, length, |
---|
1031 | &flagPtr[i]) + 1; |
---|
1032 | } |
---|
1033 | |
---|
1034 | /* |
---|
1035 | * Pass 2: copy into string rep buffer. |
---|
1036 | */ |
---|
1037 | |
---|
1038 | listPtr->bytes = ckalloc((unsigned) listPtr->length); |
---|
1039 | dst = listPtr->bytes; |
---|
1040 | for (i = 0; i < numElems; i++) { |
---|
1041 | elem = Tcl_GetStringFromObj(listRepPtr->elements[i], &length); |
---|
1042 | dst += Tcl_ConvertCountedElement(elem, length, dst, flagPtr[i]); |
---|
1043 | *dst = ' '; |
---|
1044 | dst++; |
---|
1045 | } |
---|
1046 | if (flagPtr != localFlags) { |
---|
1047 | ckfree((char *) flagPtr); |
---|
1048 | } |
---|
1049 | if (dst == listPtr->bytes) { |
---|
1050 | *dst = 0; |
---|
1051 | } else { |
---|
1052 | dst--; |
---|
1053 | *dst = 0; |
---|
1054 | } |
---|
1055 | listPtr->length = dst - listPtr->bytes; |
---|
1056 | } |
---|