jim-interp.c

   1 #include <assert.h>
   2
   3 #include "jim.h"
   4 #include "jimautoconf.h"
   5 #include "jim-subcmd.h"
   6
   7 static void JimInterpDelProc(Jim_Interp *interp, void *privData)
   8 {
   9     Jim_FreeInterp((Jim_Interp *)privData);
  10 }
  11
  12 /* Everything passing between interpreters must be converted to a string */
  13 static Jim_Obj *JimInterpCopyObj(Jim_Interp *target, Jim_Obj *obj)
  14 {
  15     const char *rep;
  16     int len;
  17
  18     rep = Jim_GetString(obj, &len);
  19     return Jim_NewStringObj(target, rep, len);
  20 }
  21
  22 #define JimInterpCopyResult(to, from) Jim_SetResult((to), JimInterpCopyObj((to), Jim_GetResult((from))))
  23
  24 static int interp_cmd_eval(Jim_Interp *interp, int argc, Jim_Obj *const *argv)
  25 {
  26     int ret;
  27     Jim_Interp *child = Jim_CmdPrivData(interp);
  28     Jim_Obj *scriptObj;
  29     Jim_Obj *targetScriptObj;
  30
  31     scriptObj = Jim_ConcatObj(interp, argc, argv);
  32     targetScriptObj = JimInterpCopyObj(child, scriptObj);
  33     Jim_FreeNewObj(interp, scriptObj);
  34
  35     Jim_IncrRefCount(targetScriptObj);
  36     ret = Jim_EvalObj(child, targetScriptObj);
  37     Jim_DecrRefCount(child, targetScriptObj);
  38
  39     JimInterpCopyResult(interp, child);
  40     return ret;
  41 }
  42
  43 static int interp_cmd_delete(Jim_Interp *interp, int argc, Jim_Obj *const *argv)
  44 {
  45     return Jim_DeleteCommand(interp, argv[0]);
  46 }
  47
  48 static void JimInterpDelAlias(Jim_Interp *interp, void *privData)
  49 {
  50     Jim_Interp *parent = Jim_GetAssocData(interp, "interp.parent");
  51     Jim_DecrRefCount(parent, (Jim_Obj *)privData);
  52 }
  53
  54 static int JimInterpAliasProc(Jim_Interp *interp, int argc, Jim_Obj *const *argv)
  55 {
  56     int i, ret;
  57     Jim_Interp *parent = Jim_GetAssocData(interp, "interp.parent");
  58     Jim_Obj *targetPrefixObj = Jim_CmdPrivData(interp);
  59     Jim_Obj *targetScriptObj;
  60
  61     assert(parent);
  62
  63     /* Build the complete command */
  64     targetScriptObj = Jim_DuplicateObj(parent, targetPrefixObj);
  65     for (i = 1; i < argc; i++) {
  66         Jim_ListAppendElement(parent, targetScriptObj,
  67             JimInterpCopyObj(parent, argv[i]));
  68     }
  69
  70     Jim_IncrRefCount(targetScriptObj);
  71     ret = Jim_EvalObj(parent, targetScriptObj);
  72     Jim_DecrRefCount(parent, targetScriptObj);
  73
  74     JimInterpCopyResult(interp, parent);
  75     return ret;
  76 }
  77
  78 static int interp_cmd_alias(Jim_Interp *interp, int argc, Jim_Obj *const *argv)
  79 {
  80     Jim_Interp *child = Jim_CmdPrivData(interp);
  81     Jim_Obj *aliasPrefixList;
  82
  83     /* The prefix list will be held inside the child, but it still belongs
  84      * to the parent!
  85      */
  86
  87     aliasPrefixList = Jim_NewListObj(interp, argv + 1, argc - 1);
  88     Jim_IncrRefCount(aliasPrefixList);
  89
  90     Jim_CreateCommand(child, Jim_String(argv[0]), JimInterpAliasProc, aliasPrefixList, JimInterpDelAlias);
  91     return JIM_OK;
  92 }
  93
  94 static const jim_subcmd_type interp_command_table[] = {
  95     {   "eval",
  96         "script ...",
  97         interp_cmd_eval,
  98         1,
  99         -1,
 100         /* Description: Concat the args and evaluate the script in the interpreter */
 101     },
 102     {   "delete",
 103         NULL,
 104         interp_cmd_delete,
 105         0,
 106         0,
 107         JIM_MODFLAG_FULLARGV,
 108         /* Description: Delete this interpreter */
 109     },
 110     {   "alias",
 111         "childcmd parentcmd ?arg ...?",
 112         interp_cmd_alias,
 113         2,
 114         -1,
 115         /* Description: Create an alias which refers to a script in the parent interpreter */
 116     },
 117     { NULL }
 118 };
 119
 120 static int JimInterpSubCmdProc(Jim_Interp *interp, int argc, Jim_Obj *const *argv)
 121 {
 122     return Jim_CallSubCmd(interp, Jim_ParseSubCmd(interp, interp_command_table, argc, argv), argc, argv);
 123 }
 124
 125 static void JimInterpCopyVariable(Jim_Interp *target, Jim_Interp *source, const char *var, const char *default_value)
 126 {
 127     Jim_Obj *value = Jim_GetGlobalVariableStr(source, var, JIM_NONE);
 128     const char *str;
 129
 130     str = value ? Jim_String(value) : default_value;
 131     if (str) {
 132         Jim_SetGlobalVariableStr(target, var, Jim_NewStringObj(target, str, -1));
 133     }
 134 }
 135
 136 /**
 137  * [interp] creates a new interpreter.
 138  */
 139 static int JimInterpCommand(Jim_Interp *interp, int argc, Jim_Obj *const *argv)
 140 {
 141     Jim_Interp *child;
 142     char buf[34];
 143
 144     if (argc != 1) {
 145         Jim_WrongNumArgs(interp, 1, argv, "");
 146         return JIM_ERR;
 147     }
 148
 149     /* Create the interpreter command */
 150     child = Jim_CreateInterp();
 151     Jim_RegisterCoreCommands(child);
 152     Jim_InitStaticExtensions(child);
 153
 154     /* Copy some core variables to the new interpreter */
 155     JimInterpCopyVariable(child, interp, "argv", NULL);
 156     JimInterpCopyVariable(child, interp, "argc", NULL);
 157     JimInterpCopyVariable(child, interp, "argv0", NULL);
 158     JimInterpCopyVariable(child, interp, "jim::argv0", NULL);
 159     JimInterpCopyVariable(child, interp, "jim::exe", NULL);
 160
 161     /* Allow the child interpreter to find the parent */
 162     Jim_SetAssocData(child, "interp.parent", NULL, interp);
 163
 164     snprintf(buf, sizeof(buf), "interp.handle%ld", Jim_GetId(interp));
 165     Jim_CreateCommand(interp, buf, JimInterpSubCmdProc, child, JimInterpDelProc);
 166     Jim_SetResult(interp, Jim_MakeGlobalNamespaceName(interp, Jim_NewStringObj(interp, buf, -1)));
 167     return JIM_OK;
 168 }
 169
 170 int Jim_interpInit(Jim_Interp *interp)
 171 {
 172     if (Jim_PackageProvide(interp, "interp", "1.0", JIM_ERRMSG))
 173         return JIM_ERR;
 174
 175     Jim_CreateCommand(interp, "interp", JimInterpCommand, NULL, NULL);
 176
 177     return JIM_OK;
 178 }