rev |
line source |
jbe@121
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1 #include <lua.h>
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jbe@121
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2 #include <lauxlib.h>
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jbe@122
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3 #include <stdlib.h>
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jbe@121
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4 #include <string.h>
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jbe@154
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5 #include <math.h>
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jbe@121
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6
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jbe@144
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7 // maximum number of nested JSON values (objects and arrays):
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jbe@150
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8 // NOTE: The Lua reference states that the stack may typically contain at least
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jbe@150
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9 // "a few thousand elements". Since every nested level consumes
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jbe@150
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10 // 3 elements on the Lua stack (the object/array, its shadow table,
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jbe@150
|
11 // a string key or a placeholder), we limit the number of nested levels
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jbe@150
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12 // to 500. If a stack overflow would still happen in the import function,
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jbe@150
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13 // this is detected nevertheless and an error is thrown (instead of
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jbe@150
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14 // returning nil and an error string).
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jbe@150
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15 #define JSON_MAXDEPTH 500
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jbe@142
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16
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jbe@155
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17 // generate dummy memory addresses that represents null values:
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jbe@155
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18 char json_nullmark;
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jbe@155
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19 #define json_isnullmark(L, i) (lua_touserdata((L), (i)) == &json_nullmark)
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jbe@155
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20 #define json_pushnullmark(L) lua_pushlightuserdata((L), &json_nullmark)
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jbe@155
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21
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jbe@144
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22 // macros for usage of Lua registry:
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jbe@144
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23 #define JSON_REGENT char
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jbe@145
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24 #define JSON_REGPOINTER void *
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jbe@145
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25 #define json_regpointer(x) (&json_registry.x)
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jbe@151
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26 #define json_regfetchpointer(L, x) lua_rawgetp((L), LUA_REGISTRYINDEX, (x))
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jbe@151
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27 #define json_regfetch(L, x) json_regfetchpointer(L, json_regpointer(x))
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jbe@151
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28 #define json_regstore(L, x) lua_rawsetp(L, LUA_REGISTRYINDEX, json_regpointer(x))
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jbe@145
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29
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jbe@144
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30 // generate dummy memory addresses that represent Lua objects
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jbe@145
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31 // via lightuserdata keys and LUA_REGISTRYINDEX:
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jbe@144
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32 static struct {
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jbe@145
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33 JSON_REGENT shadowtbl; // ephemeron table that maps tables to their corresponding shadow table
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jbe@145
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34 JSON_REGENT objectmt; // metatable for JSON objects
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jbe@145
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35 JSON_REGENT arraymt; // metatable for JSON arrays
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jbe@144
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36 } json_registry;
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jbe@138
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37
|
jbe@157
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38 // returns the string "<JSON null marker>":
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jbe@157
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39 static int json_nullmark_tostring(lua_State *L) {
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jbe@157
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40 lua_pushliteral(L, "<JSON null marker>");
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jbe@157
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41 return 1;
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jbe@157
|
42 }
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jbe@157
|
43
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jbe@169
|
44 #define json_convert_source_idx 1
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jbe@169
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45 #define json_convert_iterator_idx 2
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jbe@169
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46 #define json_convert_output_idx 3
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jbe@169
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47 #define json_convert_shadow_idx 4
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jbe@172
|
48 #define json_convert_iterfun_idx 5
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jbe@172
|
49 #define json_convert_itertbl_idx 6
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jbe@169
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50
|
jbe@169
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51 // converts a Lua table to a JSON object or JSON array:
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jbe@169
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52 // (does never modify the argument, returns an empty object or array if argument is nil)
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jbe@169
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53 static int json_convert(lua_State *L, int array) {
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jbe@171
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54 int arrayidx = 0;
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jbe@171
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55 // determine is argument is given:
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jbe@169
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56 if (lua_isnoneornil(L, json_convert_source_idx)) {
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jbe@171
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57 // if no argument is given (or if argument is nil),
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jbe@171
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58 // create table with shadow table, and leave first table on top of stack:
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jbe@144
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59 json_regfetch(L, shadowtbl);
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jbe@169
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60 lua_newtable(L);
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jbe@169
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61 lua_pushvalue(L, -1);
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jbe@169
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62 lua_newtable(L);
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jbe@169
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63 lua_rawset(L, -4);
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jbe@169
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64 } else {
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jbe@171
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65 // if an argument was given,
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jbe@171
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66 // push its iterator function on stack position 2 if existent,
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jbe@169
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67 // else push null for normal tables:
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jbe@171
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68 lua_settop(L, 1);
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jbe@169
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69 if (lua_getmetatable(L, json_convert_source_idx)) {
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jbe@169
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70 lua_getfield(L, -1, array ? "__ipairs" : "__pairs");
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jbe@169
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71 if (lua_isnil(L, -1)) luaL_checktype(L, 1, LUA_TTABLE);
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jbe@169
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72 else if (lua_type(L, -1) != LUA_TFUNCTION)
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jbe@169
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73 return luaL_error(L, "%s metamethod is not a function", array ? "__ipairs" : "__pairs");
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jbe@169
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74 lua_replace(L, -2);
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jbe@169
|
75 } else {
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jbe@169
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76 lua_pushnil(L);
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jbe@143
|
77 }
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jbe@171
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78 // create result table on stack position 3:
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jbe@169
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79 lua_newtable(L);
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jbe@169
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80 // create shadow table on stack position 4:
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jbe@169
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81 json_regfetch(L, shadowtbl);
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jbe@169
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82 lua_newtable(L);
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jbe@169
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83 lua_pushvalue(L, json_convert_output_idx);
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jbe@169
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84 lua_pushvalue(L, -2);
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jbe@169
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85 lua_rawset(L, -4);
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jbe@169
|
86 lua_replace(L, -2);
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jbe@171
|
87 // check if iterator function exists:
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jbe@169
|
88 if (lua_isnil(L, json_convert_iterator_idx)) {
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jbe@171
|
89 // if there is no iterator function,
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jbe@171
|
90 // distinguish between objects and arrays:
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jbe@171
|
91 if (array == 0) {
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jbe@171
|
92 // for an object, copy all string key value pairs to shadow table:
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jbe@171
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93 for (lua_pushnil(L); lua_next(L, json_convert_source_idx); lua_pop(L, 1)) {
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jbe@171
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94 if (lua_type(L, -2) == LUA_TSTRING) {
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jbe@171
|
95 lua_pushvalue(L, -2);
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jbe@171
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96 lua_pushvalue(L, -2);
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jbe@171
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97 lua_rawset(L, json_convert_shadow_idx);
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jbe@171
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98 }
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jbe@171
|
99 }
|
jbe@171
|
100 } else {
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jbe@171
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101 // for an array, copy consecutive integer value pairs to shadow table:
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jbe@171
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102 while (1) {
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jbe@171
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103 // TODO: Lua 5.3 may support more elements
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jbe@171
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104 if (arrayidx == INT_MAX) {
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jbe@171
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105 lua_pushnumber(L, (size_t)INT_MAX+1);
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jbe@171
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106 lua_rawget(L, json_convert_source_idx);
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jbe@171
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107 if (lua_isnil(L, -1)) break;
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jbe@171
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108 return luaL_error(L, "Array exceeded length of %d elements", INT_MAX);
|
jbe@171
|
109 }
|
jbe@171
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110 arrayidx++;
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jbe@171
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111 lua_rawgeti(L, json_convert_source_idx, arrayidx);
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jbe@171
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112 if (lua_isnil(L, -1)) break;
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jbe@171
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113 lua_rawseti(L, json_convert_shadow_idx, arrayidx);
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jbe@171
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114 }
|
jbe@169
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115 }
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jbe@169
|
116 } else {
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jbe@172
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117 // if there is an iterator function,
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jbe@172
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118 // call iterator function with source value (first argument)
|
jbe@172
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119 // and store 3 result values on stack positions 5 through 7:
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jbe@172
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120 lua_pushvalue(L, json_convert_iterator_idx);
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jbe@172
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121 lua_pushvalue(L, 1);
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jbe@172
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122 lua_call(L, 1, 3);
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jbe@174
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123 // iterate through key value pairs and store them in shadow table
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jbe@174
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124 // while replacing nil values with null-marker:
|
jbe@172
|
125 while (1) {
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jbe@172
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126 lua_pushvalue(L, json_convert_iterfun_idx);
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jbe@172
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127 lua_pushvalue(L, json_convert_itertbl_idx);
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jbe@172
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128 lua_pushvalue(L, -3);
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jbe@172
|
129 lua_remove(L, -4);
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jbe@172
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130 lua_call(L, 2, 2);
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jbe@172
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131 if (lua_isnil(L, -2)) break;
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jbe@172
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132 if (lua_type(L, -2) == (array ? LUA_TNUMBER : LUA_TSTRING)) {
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jbe@172
|
133 lua_pushvalue(L, -2);
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jbe@174
|
134 if (lua_isnil(L, -2)) json_pushnullmark(L);
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jbe@174
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135 else lua_pushvalue(L, -2);
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jbe@172
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136 lua_rawset(L, json_convert_shadow_idx);
|
jbe@172
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137 }
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jbe@172
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138 lua_pop(L, 1);
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jbe@172
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139 }
|
jbe@143
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140 }
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jbe@171
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141 // let result table be on top of stack:
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jbe@169
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142 lua_settop(L, json_convert_output_idx);
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jbe@136
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143 }
|
jbe@171
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144 // set metatable (for result table on top of stack):
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jbe@171
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145 if (array == 0) json_regfetch(L, objectmt);
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jbe@171
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146 else json_regfetch(L, arraymt);
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jbe@169
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147 lua_setmetatable(L, -2);
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jbe@171
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148 // return table on top of stack:
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jbe@136
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149 return 1;
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jbe@136
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150 }
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jbe@136
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151
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jbe@136
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152 static int json_object(lua_State *L) {
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jbe@169
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153 return json_convert(L, 0);
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jbe@136
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154 }
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jbe@136
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155
|
jbe@136
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156 static int json_array(lua_State *L) {
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jbe@169
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157 return json_convert(L, 1);
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jbe@136
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158 }
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jbe@136
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159
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jbe@145
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160 // internal states of JSON parser:
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jbe@124
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161 #define JSON_STATE_VALUE 0
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jbe@124
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162 #define JSON_STATE_OBJECT_KEY 1
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jbe@124
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163 #define JSON_STATE_OBJECT_KEY_TERMINATOR 2
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jbe@124
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164 #define JSON_STATE_OBJECT_VALUE 3
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jbe@124
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165 #define JSON_STATE_OBJECT_SEPARATOR 4
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jbe@124
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166 #define JSON_STATE_ARRAY_VALUE 5
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jbe@124
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167 #define JSON_STATE_ARRAY_SEPARATOR 6
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jbe@124
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168 #define JSON_STATE_END 7
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jbe@121
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169
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jbe@145
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170 // special Lua stack indicies for json_import function:
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jbe@138
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171 #define json_import_objectmt_idx 2
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jbe@138
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172 #define json_import_arraymt_idx 3
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jbe@138
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173 #define json_import_shadowtbl_idx 4
|
jbe@138
|
174
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jbe@168
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175 // macros for hex decoding:
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jbe@168
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176 #define json_utf16_surrogate(x) ((x) >= 0xD800 && (x) <= 0xDFFF)
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jbe@168
|
177 #define json_utf16_lead(x) ((x) >= 0xD800 && (x) <= 0xDBFF)
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jbe@168
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178 #define json_utf16_tail(x) ((x) >= 0xDC00 && (x) <= 0xDFFF)
|
jbe@167
|
179 #define json_import_readhex(x) \
|
jbe@167
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180 do { \
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jbe@167
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181 x = 0; \
|
jbe@167
|
182 for (i=0; i<4; i++) { \
|
jbe@167
|
183 x <<= 4; \
|
jbe@167
|
184 c = str[pos++]; \
|
jbe@167
|
185 if (c >= '0' && c <= '9') x += c - '0'; \
|
jbe@167
|
186 else if (c >= 'A' && c <= 'F') x += c - 'A' + 10; \
|
jbe@167
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187 else if (c >= 'a' && c <= 'f') x += c - 'a' + 10; \
|
jbe@167
|
188 else if (c == 0) goto json_import_unexpected_eof; \
|
jbe@167
|
189 else goto json_import_unexpected_escape; \
|
jbe@167
|
190 } \
|
jbe@167
|
191 } while (0)
|
jbe@167
|
192
|
jbe@136
|
193 // decodes a JSON document:
|
jbe@121
|
194 static int json_import(lua_State *L) {
|
jbe@167
|
195 int i; // loop variable
|
jbe@136
|
196 const char *str; // string to parse
|
jbe@136
|
197 size_t total; // total length of string to parse
|
jbe@136
|
198 size_t pos = 0; // current position in string to parse
|
jbe@136
|
199 size_t level = 0; // nested levels of objects/arrays currently being processed
|
jbe@145
|
200 int mode = JSON_STATE_VALUE; // state of parser (i.e. "what's expected next?")
|
jbe@170
|
201 unsigned char c; // variable to store a single character to be processed (unsigned!)
|
jbe@145
|
202 luaL_Buffer luabuf; // Lua buffer to decode JSON string values
|
jbe@145
|
203 char *cbuf; // C buffer to decode JSON string values
|
jbe@162
|
204 size_t outlen; // maximum length or write position of C buffer
|
jbe@167
|
205 long codepoint; // decoded UTF-16 character or higher codepoint
|
jbe@167
|
206 long utf16tail; // second decoded UTF-16 character (surrogate tail)
|
jbe@152
|
207 size_t arraylen; // variable to temporarily store the array length
|
jbe@166
|
208 // require string as argument and convert to C string with length information:
|
jbe@166
|
209 str = luaL_checklstring(L, 1, &total);
|
jbe@166
|
210 // if string contains a NULL byte, this is a syntax error
|
jbe@166
|
211 if (strlen(str) != total) goto json_import_syntax_error;
|
jbe@147
|
212 // stack shall contain one function argument:
|
jbe@138
|
213 lua_settop(L, 1);
|
jbe@147
|
214 // push objectmt onto stack position 2:
|
jbe@144
|
215 json_regfetch(L, objectmt);
|
jbe@147
|
216 // push arraymt onto stack position 3:
|
jbe@144
|
217 json_regfetch(L, arraymt);
|
jbe@147
|
218 // push shadowtbl onto stack position 4:
|
jbe@144
|
219 json_regfetch(L, shadowtbl);
|
jbe@136
|
220 // main loop of parser:
|
jbe@136
|
221 json_import_loop:
|
jbe@136
|
222 // skip whitespace and store next character in variable 'c':
|
jbe@146
|
223 while (c = str[pos],
|
jbe@146
|
224 c == ' ' ||
|
jbe@146
|
225 c == '\f' ||
|
jbe@146
|
226 c == '\n' ||
|
jbe@146
|
227 c == '\r' ||
|
jbe@146
|
228 c == '\t' ||
|
jbe@146
|
229 c == '\v'
|
jbe@146
|
230 ) pos++;
|
jbe@170
|
231 // NOTE: variable c needs to be unsigned in the following code
|
jbe@136
|
232 // switch statement to handle certain (single) characters:
|
jbe@121
|
233 switch (c) {
|
jbe@136
|
234 // handle end of JSON document:
|
jbe@121
|
235 case 0:
|
jbe@136
|
236 // if end of JSON document was expected, then return top element of stack as result:
|
jbe@124
|
237 if (mode == JSON_STATE_END) return 1;
|
jbe@136
|
238 // otherwise, the JSON document was malformed:
|
jbe@167
|
239 if (level == 0) {
|
jbe@167
|
240 lua_pushnil(L);
|
jbe@167
|
241 lua_pushliteral(L, "Empty string");
|
jbe@167
|
242 } else {
|
jbe@167
|
243 json_import_unexpected_eof:
|
jbe@167
|
244 lua_pushnil(L);
|
jbe@167
|
245 lua_pushliteral(L, "Unexpected end of JSON document");
|
jbe@167
|
246 }
|
jbe@121
|
247 return 2;
|
jbe@136
|
248 // new JSON object:
|
jbe@121
|
249 case '{':
|
jbe@136
|
250 // if a JSON object is not expected here, then return an error:
|
jbe@146
|
251 if (
|
jbe@146
|
252 mode != JSON_STATE_VALUE &&
|
jbe@146
|
253 mode != JSON_STATE_OBJECT_VALUE &&
|
jbe@146
|
254 mode != JSON_STATE_ARRAY_VALUE
|
jbe@146
|
255 ) goto json_import_syntax_error;
|
jbe@136
|
256 // create JSON object on stack:
|
jbe@136
|
257 lua_newtable(L);
|
jbe@136
|
258 // set metatable of JSON object:
|
jbe@138
|
259 lua_pushvalue(L, json_import_objectmt_idx);
|
jbe@125
|
260 lua_setmetatable(L, -2);
|
jbe@136
|
261 // create internal shadow table on stack:
|
jbe@136
|
262 lua_newtable(L);
|
jbe@146
|
263 // register internal shadow table:
|
jbe@123
|
264 lua_pushvalue(L, -2);
|
jbe@123
|
265 lua_pushvalue(L, -2);
|
jbe@138
|
266 lua_rawset(L, json_import_shadowtbl_idx);
|
jbe@146
|
267 // expect object key (or end of object) to follow:
|
jbe@136
|
268 mode = JSON_STATE_OBJECT_KEY;
|
jbe@146
|
269 // jump to common code for opening JSON object and JSON array:
|
jbe@142
|
270 goto json_import_open;
|
jbe@136
|
271 // new JSON array:
|
jbe@121
|
272 case '[':
|
jbe@136
|
273 // if a JSON array is not expected here, then return an error:
|
jbe@146
|
274 if (
|
jbe@146
|
275 mode != JSON_STATE_VALUE &&
|
jbe@146
|
276 mode != JSON_STATE_OBJECT_VALUE &&
|
jbe@146
|
277 mode != JSON_STATE_ARRAY_VALUE
|
jbe@146
|
278 ) goto json_import_syntax_error;
|
jbe@136
|
279 // create JSON array on stack:
|
jbe@136
|
280 lua_newtable(L);
|
jbe@136
|
281 // set metatable of JSON array:
|
jbe@138
|
282 lua_pushvalue(L, json_import_arraymt_idx);
|
jbe@125
|
283 lua_setmetatable(L, -2);
|
jbe@136
|
284 // create internal shadow table on stack:
|
jbe@136
|
285 lua_newtable(L);
|
jbe@146
|
286 // register internal shadow table:
|
jbe@123
|
287 lua_pushvalue(L, -2);
|
jbe@123
|
288 lua_pushvalue(L, -2);
|
jbe@138
|
289 lua_rawset(L, json_import_shadowtbl_idx);
|
jbe@140
|
290 // add nil as key (needed to keep stack balance) and as magic to detect arrays:
|
jbe@140
|
291 lua_pushnil(L);
|
jbe@146
|
292 // expect array value (or end of array) to follow:
|
jbe@142
|
293 mode = JSON_STATE_ARRAY_VALUE;
|
jbe@142
|
294 // continue with common code for opening JSON object and JSON array:
|
jbe@146
|
295 // common code for opening JSON object or JSON array:
|
jbe@142
|
296 json_import_open:
|
jbe@142
|
297 // limit nested levels:
|
jbe@142
|
298 if (level >= JSON_MAXDEPTH) {
|
jbe@142
|
299 lua_pushnil(L);
|
jbe@164
|
300 lua_pushfstring(L, "More than %d nested JSON levels", JSON_MAXDEPTH);
|
jbe@142
|
301 return 2;
|
jbe@142
|
302 }
|
jbe@142
|
303 // additional buffer overflow protection:
|
jbe@142
|
304 if (!lua_checkstack(L, LUA_MINSTACK))
|
jbe@142
|
305 return luaL_error(L, "Caught stack overflow in JSON import function (too many nested levels and stack size too small)");
|
jbe@136
|
306 // increment level:
|
jbe@121
|
307 level++;
|
jbe@142
|
308 // consume input character:
|
jbe@142
|
309 pos++;
|
jbe@121
|
310 goto json_import_loop;
|
jbe@136
|
311 // end of JSON object:
|
jbe@121
|
312 case '}':
|
jbe@136
|
313 // if end of JSON object is not expected here, then return an error:
|
jbe@146
|
314 if (
|
jbe@146
|
315 mode != JSON_STATE_OBJECT_KEY &&
|
jbe@146
|
316 mode != JSON_STATE_OBJECT_SEPARATOR
|
jbe@146
|
317 ) goto json_import_syntax_error;
|
jbe@136
|
318 // jump to common code for end of JSON object and JSON array:
|
jbe@121
|
319 goto json_import_close;
|
jbe@136
|
320 // end of JSON array:
|
jbe@121
|
321 case ']':
|
jbe@136
|
322 // if end of JSON array is not expected here, then return an error:
|
jbe@146
|
323 if (
|
jbe@146
|
324 mode != JSON_STATE_ARRAY_VALUE &&
|
jbe@146
|
325 mode != JSON_STATE_ARRAY_SEPARATOR
|
jbe@146
|
326 ) goto json_import_syntax_error;
|
jbe@146
|
327 // pop nil key/magic (that was needed to keep stack balance):
|
jbe@140
|
328 lua_pop(L, 1);
|
jbe@136
|
329 // continue with common code for end of JSON object and JSON array:
|
jbe@136
|
330 // common code for end of JSON object or JSON array:
|
jbe@121
|
331 json_import_close:
|
jbe@136
|
332 // consume input character:
|
jbe@121
|
333 pos++;
|
jbe@136
|
334 // pop shadow table:
|
jbe@136
|
335 lua_pop(L, 1);
|
jbe@136
|
336 // check if nested:
|
jbe@121
|
337 if (--level) {
|
jbe@146
|
338 // if nested,
|
jbe@146
|
339 // check if outer(!) structure is an array or object:
|
jbe@140
|
340 if (lua_isnil(L, -2)) {
|
jbe@136
|
341 // select array value processing:
|
jbe@124
|
342 mode = JSON_STATE_ARRAY_VALUE;
|
jbe@121
|
343 } else {
|
jbe@136
|
344 // select object value processing:
|
jbe@124
|
345 mode = JSON_STATE_OBJECT_VALUE;
|
jbe@121
|
346 }
|
jbe@136
|
347 // store value in outer structure:
|
jbe@121
|
348 goto json_import_process_value;
|
jbe@121
|
349 }
|
jbe@136
|
350 // if not nested, then expect end of JSON document and continue with loop:
|
jbe@136
|
351 mode = JSON_STATE_END;
|
jbe@121
|
352 goto json_import_loop;
|
jbe@136
|
353 // key terminator:
|
jbe@121
|
354 case ':':
|
jbe@136
|
355 // if key terminator is not expected here, then return an error:
|
jbe@124
|
356 if (mode != JSON_STATE_OBJECT_KEY_TERMINATOR)
|
jbe@121
|
357 goto json_import_syntax_error;
|
jbe@136
|
358 // consume input character:
|
jbe@121
|
359 pos++;
|
jbe@146
|
360 // expect object value to follow:
|
jbe@124
|
361 mode = JSON_STATE_OBJECT_VALUE;
|
jbe@146
|
362 // continue with loop:
|
jbe@121
|
363 goto json_import_loop;
|
jbe@136
|
364 // value terminator (NOTE: trailing comma at end of value or key-value list is tolerated by this parser)
|
jbe@121
|
365 case ',':
|
jbe@146
|
366 // branch according to parser state:
|
jbe@124
|
367 if (mode == JSON_STATE_OBJECT_SEPARATOR) {
|
jbe@146
|
368 // expect an object key to follow:
|
jbe@124
|
369 mode = JSON_STATE_OBJECT_KEY;
|
jbe@124
|
370 } else if (mode == JSON_STATE_ARRAY_SEPARATOR) {
|
jbe@146
|
371 // expect an array value to follow:
|
jbe@124
|
372 mode = JSON_STATE_ARRAY_VALUE;
|
jbe@121
|
373 } else {
|
jbe@136
|
374 // if value terminator is not expected here, then return an error:
|
jbe@136
|
375 goto json_import_syntax_error;
|
jbe@121
|
376 }
|
jbe@136
|
377 // consume input character:
|
jbe@121
|
378 pos++;
|
jbe@136
|
379 // continue with loop:
|
jbe@121
|
380 goto json_import_loop;
|
jbe@136
|
381 // string literal:
|
jbe@121
|
382 case '"':
|
jbe@146
|
383 // consume quote character:
|
jbe@146
|
384 pos++;
|
jbe@162
|
385 // find last character in input string:
|
jbe@162
|
386 outlen = pos;
|
jbe@162
|
387 while ((c = str[outlen]) != '"') {
|
jbe@161
|
388 // consume one character:
|
jbe@162
|
389 outlen++;
|
jbe@161
|
390 // handle unexpected end of JSON document:
|
jbe@161
|
391 if (c == 0) goto json_import_unexpected_eof;
|
jbe@161
|
392 // consume one extra character when encountering an escaped quote:
|
jbe@162
|
393 else if (c == '\\' && str[outlen] == '"') outlen++;
|
jbe@161
|
394 }
|
jbe@162
|
395 // determine buffer length:
|
jbe@162
|
396 outlen -= pos;
|
jbe@161
|
397 // check if string is non empty:
|
jbe@162
|
398 if (outlen) {
|
jbe@161
|
399 // prepare buffer to decode string (with maximum possible length) and set write position to zero:
|
jbe@162
|
400 cbuf = luaL_buffinitsize(L, &luabuf, outlen);
|
jbe@162
|
401 outlen = 0;
|
jbe@161
|
402 // loop through the characters until encountering end quote:
|
jbe@161
|
403 while ((c = str[pos++]) != '"') {
|
jbe@162
|
404 // NOTE: unexpected end cannot happen anymore
|
jbe@162
|
405 if (c < 32 || c == 127) {
|
jbe@161
|
406 // do not allow ASCII control characters:
|
jbe@161
|
407 // NOTE: illegal UTF-8 sequences and extended control characters are not sanitized
|
jbe@161
|
408 // by this parser to allow different encodings than Unicode
|
jbe@161
|
409 lua_pushnil(L);
|
jbe@161
|
410 lua_pushliteral(L, "Unexpected control character in JSON string");
|
jbe@161
|
411 return 2;
|
jbe@161
|
412 } else if (c == '\\') {
|
jbe@161
|
413 // read next char after backslash escape:
|
jbe@161
|
414 c = str[pos++];
|
jbe@161
|
415 switch (c) {
|
jbe@161
|
416 // unexpected end-of-string:
|
jbe@161
|
417 case 0:
|
jbe@161
|
418 goto json_import_unexpected_eof;
|
jbe@161
|
419 // unescaping of quotation mark, slash, and backslash:
|
jbe@161
|
420 case '"':
|
jbe@161
|
421 case '/':
|
jbe@161
|
422 case '\\':
|
jbe@162
|
423 cbuf[outlen++] = c;
|
jbe@161
|
424 break;
|
jbe@161
|
425 // unescaping of backspace:
|
jbe@162
|
426 case 'b': cbuf[outlen++] = '\b'; break;
|
jbe@161
|
427 // unescaping of form-feed:
|
jbe@162
|
428 case 'f': cbuf[outlen++] = '\f'; break;
|
jbe@161
|
429 // unescaping of new-line:
|
jbe@162
|
430 case 'n': cbuf[outlen++] = '\n'; break;
|
jbe@161
|
431 // unescaping of carriage-return:
|
jbe@162
|
432 case 'r': cbuf[outlen++] = '\r'; break;
|
jbe@161
|
433 // unescaping of tabulator:
|
jbe@162
|
434 case 't': cbuf[outlen++] = '\t'; break;
|
jbe@161
|
435 // unescaping of UTF-16 characters
|
jbe@161
|
436 case 'u':
|
jbe@167
|
437 // decode 4 hex nibbles:
|
jbe@167
|
438 json_import_readhex(codepoint);
|
jbe@167
|
439 // handle surrogate character:
|
jbe@167
|
440 if (json_utf16_surrogate(codepoint)) {
|
jbe@167
|
441 // check if first surrogate is in valid range:
|
jbe@167
|
442 if (json_utf16_lead(codepoint)) {
|
jbe@167
|
443 // require second surrogate:
|
jbe@167
|
444 if ((c = str[pos++]) != '\\' || (c = str[pos++]) != 'u') {
|
jbe@167
|
445 if (c == 0) goto json_import_unexpected_eof;
|
jbe@167
|
446 else goto json_import_wrong_surrogate;
|
jbe@167
|
447 }
|
jbe@167
|
448 // read 4 hex nibbles of second surrogate character:
|
jbe@167
|
449 json_import_readhex(utf16tail);
|
jbe@167
|
450 // check if second surrogate is in valid range:
|
jbe@167
|
451 if (!json_utf16_tail(utf16tail)) goto json_import_wrong_surrogate;
|
jbe@167
|
452 // calculate codepoint:
|
jbe@167
|
453 codepoint = 0x10000 + (utf16tail - 0xDC00) + (codepoint - 0xD800) * 0x400;
|
jbe@167
|
454 } else {
|
jbe@167
|
455 // throw error for wrong surrogates:
|
jbe@167
|
456 json_import_wrong_surrogate:
|
jbe@167
|
457 lua_pushnil(L);
|
jbe@167
|
458 lua_pushliteral(L, "Illegal UTF-16 surrogate in JSON string escape sequence");
|
jbe@167
|
459 return 2;
|
jbe@167
|
460 }
|
jbe@167
|
461 }
|
jbe@167
|
462 // encode as UTF-8:
|
jbe@167
|
463 if (codepoint < 0x80) {
|
jbe@167
|
464 cbuf[outlen++] = (char)codepoint;
|
jbe@167
|
465 } else if (codepoint < 0x800) {
|
jbe@167
|
466 cbuf[outlen++] = (char)(0xc0 | (codepoint >> 6));
|
jbe@167
|
467 cbuf[outlen++] = (char)(0x80 | (codepoint & 0x3f));
|
jbe@167
|
468 } else if (codepoint < 0x10000) {
|
jbe@167
|
469 cbuf[outlen++] = (char)(0xe0 | (codepoint >> 12));
|
jbe@167
|
470 cbuf[outlen++] = (char)(0x80 | ((codepoint >> 6) & 0x3f));
|
jbe@167
|
471 cbuf[outlen++] = (char)(0x80 | (codepoint & 0x3f));
|
jbe@167
|
472 } else {
|
jbe@167
|
473 cbuf[outlen++] = (char)(0xf0 | (codepoint >> 18));
|
jbe@167
|
474 cbuf[outlen++] = (char)(0x80 | ((codepoint >> 12) & 0x3f));
|
jbe@167
|
475 cbuf[outlen++] = (char)(0x80 | ((codepoint >> 6) & 0x3f));
|
jbe@167
|
476 cbuf[outlen++] = (char)(0x80 | (codepoint & 0x3f));
|
jbe@167
|
477 }
|
jbe@167
|
478 break;
|
jbe@161
|
479 // unexpected escape sequence:
|
jbe@161
|
480 default:
|
jbe@167
|
481 json_import_unexpected_escape:
|
jbe@161
|
482 lua_pushnil(L);
|
jbe@161
|
483 lua_pushliteral(L, "Unexpected string escape sequence in JSON document");
|
jbe@161
|
484 return 2;
|
jbe@161
|
485 }
|
jbe@161
|
486 } else {
|
jbe@161
|
487 // normal character:
|
jbe@162
|
488 cbuf[outlen++] = c;
|
jbe@121
|
489 }
|
jbe@121
|
490 }
|
jbe@161
|
491 // process buffer to Lua string:
|
jbe@162
|
492 luaL_pushresultsize(&luabuf, outlen);
|
jbe@161
|
493 } else {
|
jbe@161
|
494 // if JSON string is empty,
|
jbe@161
|
495 // push empty Lua string:
|
jbe@161
|
496 lua_pushliteral(L, "");
|
jbe@167
|
497 // consume closing quote:
|
jbe@167
|
498 pos++;
|
jbe@121
|
499 }
|
jbe@136
|
500 // continue with processing of decoded string:
|
jbe@121
|
501 goto json_import_process_value;
|
jbe@121
|
502 }
|
jbe@136
|
503 // process values whose type is is not deducible from a single character:
|
jbe@136
|
504 if ((c >= '0' && c <= '9') || c == '-' || c == '+') {
|
jbe@146
|
505 // for numbers,
|
jbe@146
|
506 // use strtod() call to parse a (double precision) floating point number:
|
jbe@167
|
507 double numval;
|
jbe@122
|
508 char *endptr;
|
jbe@122
|
509 numval = strtod(str+pos, &endptr);
|
jbe@146
|
510 // catch parsing errors:
|
jbe@122
|
511 if (endptr == str+pos) goto json_import_syntax_error;
|
jbe@146
|
512 // consume characters that were parsed:
|
jbe@122
|
513 pos += endptr - (str+pos);
|
jbe@146
|
514 // push parsed (double precision) floating point number on Lua stack:
|
jbe@122
|
515 lua_pushnumber(L, numval);
|
jbe@122
|
516 } else if (!strncmp(str+pos, "true", 4)) {
|
jbe@136
|
517 // consume 4 input characters for "true":
|
jbe@121
|
518 pos += 4;
|
jbe@147
|
519 // put Lua true value onto stack:
|
jbe@136
|
520 lua_pushboolean(L, 1);
|
jbe@121
|
521 } else if (!strncmp(str+pos, "false", 5)) {
|
jbe@136
|
522 // consume 5 input characters for "false":
|
jbe@121
|
523 pos += 5;
|
jbe@147
|
524 // put Lua false value onto stack:
|
jbe@136
|
525 lua_pushboolean(L, 0);
|
jbe@121
|
526 } else if (!strncmp(str+pos, "null", 4)) {
|
jbe@136
|
527 // consume 4 input characters for "null":
|
jbe@136
|
528 pos += 4;
|
jbe@153
|
529 // different behavor for top-level and sub-levels:
|
jbe@153
|
530 if (level) {
|
jbe@153
|
531 // if sub-level,
|
jbe@153
|
532 // push special null-marker onto stack:
|
jbe@155
|
533 json_pushnullmark(L);
|
jbe@153
|
534 } else {
|
jbe@153
|
535 // if top-level,
|
jbe@153
|
536 // push nil onto stack:
|
jbe@153
|
537 lua_pushnil(L);
|
jbe@153
|
538 }
|
jbe@121
|
539 } else {
|
jbe@136
|
540 // all other cases are a syntax error:
|
jbe@121
|
541 goto json_import_syntax_error;
|
jbe@121
|
542 }
|
jbe@136
|
543 // process a decoded value or key value pair (expected on top of Lua stack):
|
jbe@136
|
544 json_import_process_value:
|
jbe@121
|
545 switch (mode) {
|
jbe@136
|
546 // an object key has been read:
|
jbe@124
|
547 case JSON_STATE_OBJECT_KEY:
|
jbe@136
|
548 // if an object key is not a string, then this is a syntax error:
|
jbe@121
|
549 if (lua_type(L, -1) != LUA_TSTRING) goto json_import_syntax_error;
|
jbe@146
|
550 // expect key terminator to follow:
|
jbe@124
|
551 mode = JSON_STATE_OBJECT_KEY_TERMINATOR;
|
jbe@146
|
552 // continue with loop:
|
jbe@121
|
553 goto json_import_loop;
|
jbe@136
|
554 // a key value pair has been read:
|
jbe@124
|
555 case JSON_STATE_OBJECT_VALUE:
|
jbe@136
|
556 // store key value pair in outer shadow table:
|
jbe@130
|
557 lua_rawset(L, -3);
|
jbe@146
|
558 // expect value terminator (or end of object) to follow:
|
jbe@124
|
559 mode = JSON_STATE_OBJECT_SEPARATOR;
|
jbe@146
|
560 // continue with loop:
|
jbe@121
|
561 goto json_import_loop;
|
jbe@136
|
562 // an array value has been read:
|
jbe@124
|
563 case JSON_STATE_ARRAY_VALUE:
|
jbe@152
|
564 // get current array length:
|
jbe@152
|
565 arraylen = lua_rawlen(L, -3);
|
jbe@152
|
566 // throw error if array would exceed INT_MAX elements:
|
jbe@152
|
567 // TODO: Lua 5.3 may support more elements
|
jbe@152
|
568 if (arraylen >= INT_MAX) {
|
jbe@152
|
569 lua_pushnil(L);
|
jbe@152
|
570 lua_pushfstring(L, "Array exceeded length of %d elements", INT_MAX);
|
jbe@152
|
571 }
|
jbe@136
|
572 // store value in outer shadow table:
|
jbe@152
|
573 lua_rawseti(L, -3, arraylen + 1);
|
jbe@146
|
574 // expect value terminator (or end of object) to follow:
|
jbe@124
|
575 mode = JSON_STATE_ARRAY_SEPARATOR;
|
jbe@146
|
576 // continue with loop
|
jbe@121
|
577 goto json_import_loop;
|
jbe@136
|
578 // a single value has been read:
|
jbe@124
|
579 case JSON_STATE_VALUE:
|
jbe@136
|
580 // leave value on top of stack, expect end of JSON document, and continue with loop:
|
jbe@124
|
581 mode = JSON_STATE_END;
|
jbe@121
|
582 goto json_import_loop;
|
jbe@121
|
583 }
|
jbe@146
|
584 // syntax error handling (reachable by goto statement):
|
jbe@136
|
585 json_import_syntax_error:
|
jbe@121
|
586 lua_pushnil(L);
|
jbe@121
|
587 lua_pushliteral(L, "Syntax error in JSON document");
|
jbe@121
|
588 return 2;
|
jbe@121
|
589 }
|
jbe@121
|
590
|
jbe@146
|
591 // special Lua stack indicies for json_path function:
|
jbe@138
|
592 #define json_path_shadowtbl_idx 1
|
jbe@146
|
593
|
jbe@146
|
594 // stack offset of arguments to json_path function:
|
jbe@155
|
595 #define json_path_idxshift 1
|
jbe@138
|
596
|
jbe@146
|
597 // gets a value or its type from a JSON document (passed as first argument)
|
jbe@147
|
598 // using a path (passed as variable number of keys after first argument):
|
jbe@137
|
599 static int json_path(lua_State *L, int type_mode) {
|
jbe@146
|
600 int stacktop; // stack index of top of stack (after shifting)
|
jbe@146
|
601 int idx = 2 + json_path_idxshift; // stack index of current argument to process
|
jbe@173
|
602 // require at least one argument:
|
jbe@173
|
603 luaL_checkany(L, 1);
|
jbe@148
|
604 // insert shadowtbl into stack at position 1 (shifting the arguments):
|
jbe@144
|
605 json_regfetch(L, shadowtbl);
|
jbe@138
|
606 lua_insert(L, 1);
|
jbe@146
|
607 // store stack index of top of stack:
|
jbe@138
|
608 stacktop = lua_gettop(L);
|
jbe@146
|
609 // use first argument as "current value" (stored on top of stack):
|
jbe@138
|
610 lua_pushvalue(L, 1 + json_path_idxshift);
|
jbe@146
|
611 // process each "path key" (2nd argument and following arguments):
|
jbe@138
|
612 while (idx <= stacktop) {
|
jbe@146
|
613 // if "current value" (on top of stack) is nil, then the path cannot be walked and nil is returned:
|
jbe@137
|
614 if (lua_isnil(L, -1)) return 1;
|
jbe@137
|
615 // try to get shadow table of "current value":
|
jbe@130
|
616 lua_pushvalue(L, -1);
|
jbe@138
|
617 lua_rawget(L, json_path_shadowtbl_idx);
|
jbe@126
|
618 if (lua_isnil(L, -1)) {
|
jbe@137
|
619 // if no shadow table is found,
|
jbe@130
|
620 if (lua_type(L, -1) == LUA_TTABLE) {
|
jbe@146
|
621 // and if "current value" is a table,
|
jbe@146
|
622 // drop nil from stack:
|
jbe@146
|
623 lua_pop(L, 1);
|
jbe@137
|
624 // get "next value" using the "path key":
|
jbe@130
|
625 lua_pushvalue(L, idx++);
|
jbe@130
|
626 lua_gettable(L, -2);
|
jbe@130
|
627 } else {
|
jbe@137
|
628 // if "current value" is not a table,
|
jbe@146
|
629 // then the path cannot be walked and nil (already on top of stack) is returned:
|
jbe@137
|
630 return 1;
|
jbe@130
|
631 }
|
jbe@130
|
632 } else {
|
jbe@137
|
633 // if a shadow table is found,
|
jbe@137
|
634 // set "current value" to its shadow table:
|
jbe@130
|
635 lua_replace(L, -2);
|
jbe@137
|
636 // get "next value" using the "path key":
|
jbe@130
|
637 lua_pushvalue(L, idx++);
|
jbe@130
|
638 lua_rawget(L, -2);
|
jbe@126
|
639 }
|
jbe@137
|
640 // the "next value" replaces the "current value":
|
jbe@130
|
641 lua_replace(L, -2);
|
jbe@126
|
642 }
|
jbe@137
|
643 if (!type_mode) {
|
jbe@137
|
644 // if a value (and not its type) was requested,
|
jbe@137
|
645 // check if value is the null-marker, and store nil on top of Lua stack in that case:
|
jbe@155
|
646 if (json_isnullmark(L, -1)) lua_pushnil(L);
|
jbe@137
|
647 } else {
|
jbe@137
|
648 // if the type was requested,
|
jbe@137
|
649 // check if value is the null-marker:
|
jbe@155
|
650 if (json_isnullmark(L, -1)) {
|
jbe@137
|
651 // if yes, store string "null" on top of Lua stack:
|
jbe@130
|
652 lua_pushliteral(L, "null");
|
jbe@137
|
653 } else {
|
jbe@137
|
654 // otherwise,
|
jbe@138
|
655 // check if metatable indicates "object" or "array":
|
jbe@138
|
656 if (lua_getmetatable(L, -1)) {
|
jbe@144
|
657 json_regfetch(L, objectmt);
|
jbe@138
|
658 if (lua_rawequal(L, -2, -1)) {
|
jbe@146
|
659 // if value has metatable for JSON objects,
|
jbe@138
|
660 // return string "object":
|
jbe@138
|
661 lua_pushliteral(L, "object");
|
jbe@138
|
662 return 1;
|
jbe@138
|
663 }
|
jbe@144
|
664 json_regfetch(L, arraymt);
|
jbe@138
|
665 if (lua_rawequal(L, -3, -1)) {
|
jbe@146
|
666 // if value has metatable for JSON arrays,
|
jbe@146
|
667 // return string "object":
|
jbe@138
|
668 lua_pushliteral(L, "array");
|
jbe@138
|
669 return 1;
|
jbe@138
|
670 }
|
jbe@146
|
671 // remove 3 metatables (one of the value, two for comparison) from stack:
|
jbe@138
|
672 lua_pop(L, 3);
|
jbe@138
|
673 }
|
jbe@138
|
674 // otherwise, get the Lua type:
|
jbe@138
|
675 lua_pushstring(L, lua_typename(L, lua_type(L, -1)));
|
jbe@126
|
676 }
|
jbe@126
|
677 }
|
jbe@137
|
678 // return the top most value on the Lua stack:
|
jbe@137
|
679 return 1;
|
jbe@130
|
680 }
|
jbe@130
|
681
|
jbe@147
|
682 // gets a value from a JSON document (passed as first argument)
|
jbe@147
|
683 // using a path (passed as variable number of keys after first argument):
|
jbe@130
|
684 static int json_get(lua_State *L) {
|
jbe@137
|
685 return json_path(L, 0);
|
jbe@130
|
686 }
|
jbe@130
|
687
|
jbe@147
|
688 // gets a value's type from a JSON document (passed as first argument)
|
jbe@147
|
689 // using a path (variable number of keys after first argument):
|
jbe@130
|
690 static int json_type(lua_State *L) {
|
jbe@137
|
691 return json_path(L, 1);
|
jbe@130
|
692 }
|
jbe@130
|
693
|
jbe@173
|
694 // special Lua stack indicies for json_set function:
|
jbe@173
|
695 #define json_set_shadowtbl_idx 1
|
jbe@173
|
696 #define json_set_objectmt_idx 2
|
jbe@173
|
697 #define json_set_arraymt_idx 3
|
jbe@173
|
698
|
jbe@173
|
699 // stack offset of arguments to json_set function:
|
jbe@173
|
700 #define json_set_idxshift 3
|
jbe@173
|
701
|
jbe@173
|
702 // sets a value (passed as second argument) in a JSON document (passed as first argument)
|
jbe@173
|
703 // using a path (variable number of keys starting at third argument):
|
jbe@173
|
704 static int json_set(lua_State *L) {
|
jbe@173
|
705 int stacktop; // stack index of top of stack (after shifting)
|
jbe@173
|
706 int idx = 3; // stack index of current argument to process
|
jbe@173
|
707 // require at least two arguments:
|
jbe@173
|
708 luaL_checkany(L, 1);
|
jbe@173
|
709 luaL_checkany(L, 2);
|
jbe@173
|
710 // insert shadowtbl into stack at position 1 (shifting the arguments):
|
jbe@173
|
711 json_regfetch(L, shadowtbl);
|
jbe@173
|
712 lua_insert(L, 1);
|
jbe@173
|
713 // insert objectmt into stack at position 2 (shifting the arguments):
|
jbe@173
|
714 json_regfetch(L, objectmt);
|
jbe@173
|
715 lua_insert(L, 2);
|
jbe@173
|
716 // insert arraymt into stack at position 3 (shifting the arguments):
|
jbe@173
|
717 json_regfetch(L, arraymt);
|
jbe@173
|
718 lua_insert(L, 3);
|
jbe@173
|
719 // store stack index of top of stack:
|
jbe@173
|
720 stacktop = lua_gettop(L);
|
jbe@173
|
721 // use nil as initial "parent value":
|
jbe@173
|
722 lua_pushnil(L);
|
jbe@173
|
723 // use first argument as "current value":
|
jbe@173
|
724 lua_pushvalue(L, 1 + json_set_idxshift);
|
jbe@173
|
725 // set all necessary values in path:
|
jbe@173
|
726 for (idx = 3 + json_set_idxshift; idx<=stacktop; idx++) {
|
jbe@173
|
727 // push metatable of "current value" onto stack:
|
jbe@173
|
728 if (!lua_getmetatable(L, -1)) lua_pushnil(L);
|
jbe@173
|
729 // distinguish according to type of path key:
|
jbe@173
|
730 switch (lua_type(L, idx)) {
|
jbe@173
|
731 case LUA_TSTRING:
|
jbe@173
|
732 // if path key is a string,
|
jbe@173
|
733 // check if "current value" is a JSON object (or table without metatable):
|
jbe@173
|
734 if (
|
jbe@173
|
735 lua_rawequal(L, -1, json_set_objectmt_idx) ||
|
jbe@173
|
736 (lua_isnil(L, -1) && lua_type(L, -2) == LUA_TTABLE)
|
jbe@173
|
737 ) {
|
jbe@173
|
738 // if "current value" is acceptable,
|
jbe@173
|
739 // pop metatable and leave "current value" on top of stack:
|
jbe@173
|
740 lua_pop(L, 1);
|
jbe@173
|
741 } else {
|
jbe@173
|
742 // if "current value" is not acceptable:
|
jbe@173
|
743 // pop metatable and "current value":
|
jbe@173
|
744 lua_pop(L, 2);
|
jbe@173
|
745 // throw error if parent element does not exist:
|
jbe@173
|
746 if (lua_isnil(L, -1)) return luaL_error(L, "Root element is not a JSON object");
|
jbe@173
|
747 // push new JSON object as "current value" onto stack:
|
jbe@173
|
748 lua_newtable(L);
|
jbe@173
|
749 // create and register shadow table:
|
jbe@173
|
750 lua_pushvalue(L, -1);
|
jbe@173
|
751 lua_newtable(L);
|
jbe@173
|
752 lua_rawset(L, json_set_shadowtbl_idx);
|
jbe@173
|
753 // set metatable of JSON object:
|
jbe@173
|
754 lua_pushvalue(L, json_set_objectmt_idx);
|
jbe@173
|
755 lua_setmetatable(L, -2);
|
jbe@173
|
756 // set entry in "parent value":
|
jbe@173
|
757 lua_pushvalue(L, idx-1);
|
jbe@173
|
758 lua_pushvalue(L, -2);
|
jbe@173
|
759 lua_settable(L, -4);
|
jbe@173
|
760 }
|
jbe@173
|
761 break;
|
jbe@173
|
762 case LUA_TNUMBER:
|
jbe@173
|
763 // if path key is a number,
|
jbe@173
|
764 // check if "current value" is a JSON array (or table without metatable):
|
jbe@173
|
765 if (
|
jbe@173
|
766 lua_rawequal(L, -1, json_set_arraymt_idx) ||
|
jbe@173
|
767 (lua_isnil(L, -1) && lua_type(L, -2) == LUA_TTABLE)
|
jbe@173
|
768 ) {
|
jbe@173
|
769 // if "current value" is acceptable,
|
jbe@173
|
770 // pop metatable and leave "current value" on top of stack:
|
jbe@173
|
771 lua_pop(L, 1);
|
jbe@173
|
772 } else {
|
jbe@173
|
773 // if "current value" is not acceptable:
|
jbe@173
|
774 // pop metatable and "current value":
|
jbe@173
|
775 lua_pop(L, 2);
|
jbe@173
|
776 // throw error if parent element does not exist:
|
jbe@173
|
777 if (lua_isnil(L, -1)) return luaL_error(L, "Root element is not a JSON array");
|
jbe@173
|
778 // push new JSON array as "current value" onto stack:
|
jbe@173
|
779 lua_newtable(L);
|
jbe@173
|
780 // create and register shadow table:
|
jbe@173
|
781 lua_pushvalue(L, -1);
|
jbe@173
|
782 lua_newtable(L);
|
jbe@173
|
783 lua_rawset(L, json_set_shadowtbl_idx);
|
jbe@173
|
784 // set metatable of JSON array:
|
jbe@173
|
785 lua_pushvalue(L, json_set_arraymt_idx);
|
jbe@173
|
786 lua_setmetatable(L, -2);
|
jbe@173
|
787 // set entry in "parent value":
|
jbe@173
|
788 lua_pushvalue(L, idx-1);
|
jbe@173
|
789 lua_pushvalue(L, -2);
|
jbe@173
|
790 lua_settable(L, -4);
|
jbe@173
|
791 }
|
jbe@173
|
792 break;
|
jbe@173
|
793 default:
|
jbe@173
|
794 return luaL_error(L, "Invalid path key of type %s", lua_typename(L, lua_type(L, idx)));
|
jbe@173
|
795 }
|
jbe@173
|
796 // check if last path element is being processed:
|
jbe@173
|
797 if (idx == stacktop) {
|
jbe@173
|
798 // if the last path element is being processed,
|
jbe@173
|
799 // set last path value in "current value" container:
|
jbe@173
|
800 lua_pushvalue(L, idx);
|
jbe@173
|
801 lua_pushvalue(L, 2 + json_set_idxshift);
|
jbe@173
|
802 lua_settable(L, -3);
|
jbe@173
|
803 } else {
|
jbe@173
|
804 // if the processed path element is not the last,
|
jbe@173
|
805 // use old "current value" as new "parent value"
|
jbe@173
|
806 lua_remove(L, -2);
|
jbe@173
|
807 // push new "current value" onto stack by performing a lookup:
|
jbe@173
|
808 lua_pushvalue(L, idx);
|
jbe@173
|
809 lua_gettable(L, -2);
|
jbe@173
|
810 }
|
jbe@173
|
811 }
|
jbe@173
|
812 // return first argument for convenience:
|
jbe@173
|
813 lua_settop(L, 1 + json_set_idxshift);
|
jbe@173
|
814 return 1;
|
jbe@173
|
815 }
|
jbe@173
|
816
|
jbe@147
|
817 // returns the length of a JSON array (or zero for a table without numeric keys):
|
jbe@130
|
818 static int json_len(lua_State *L) {
|
jbe@147
|
819 // stack shall contain one function argument:
|
jbe@130
|
820 lua_settop(L, 1);
|
jbe@148
|
821 // try to get corresponding shadow table for first argument:
|
jbe@144
|
822 json_regfetch(L, shadowtbl);
|
jbe@130
|
823 lua_pushvalue(L, 1);
|
jbe@138
|
824 lua_rawget(L, -2);
|
jbe@147
|
825 // if shadow table does not exist, return length of argument, else length of shadow table:
|
jbe@147
|
826 lua_pushnumber(L, lua_rawlen(L, lua_isnil(L, -1) ? 1 : -1));
|
jbe@123
|
827 return 1;
|
jbe@123
|
828 }
|
jbe@123
|
829
|
jbe@130
|
830 static int json_index(lua_State *L) {
|
jbe@148
|
831 // stack shall contain two function arguments:
|
jbe@130
|
832 lua_settop(L, 2);
|
jbe@155
|
833 // get corresponding shadow table for first argument:
|
jbe@144
|
834 json_regfetch(L, shadowtbl);
|
jbe@130
|
835 lua_pushvalue(L, 1);
|
jbe@155
|
836 lua_rawget(L, -2);
|
jbe@148
|
837 // throw error if no shadow table was found:
|
jbe@139
|
838 if (lua_isnil(L, -1)) return luaL_error(L, "Shadow table not found");
|
jbe@148
|
839 // use key passed as second argument to lookup value in shadow table:
|
jbe@130
|
840 lua_pushvalue(L, 2);
|
jbe@130
|
841 lua_rawget(L, -2);
|
jbe@148
|
842 // if value is null-marker, then push nil onto stack:
|
jbe@155
|
843 if (json_isnullmark(L, -1)) lua_pushnil(L);
|
jbe@148
|
844 // return either looked up value, or nil
|
jbe@127
|
845 return 1;
|
jbe@127
|
846 }
|
jbe@127
|
847
|
jbe@130
|
848 static int json_newindex(lua_State *L) {
|
jbe@148
|
849 // stack shall contain three function arguments:
|
jbe@130
|
850 lua_settop(L, 3);
|
jbe@148
|
851 // get corresponding shadow table for first argument:
|
jbe@144
|
852 json_regfetch(L, shadowtbl);
|
jbe@123
|
853 lua_pushvalue(L, 1);
|
jbe@143
|
854 lua_rawget(L, -2);
|
jbe@148
|
855 // throw error if no shadow table was found:
|
jbe@130
|
856 if (lua_isnil(L, -1)) return luaL_error(L, "Shadow table not found");
|
jbe@148
|
857 // replace first argument with shadow table:
|
jbe@130
|
858 lua_replace(L, 1);
|
jbe@148
|
859 // reset stack and use second and third argument to write to shadow table:
|
jbe@139
|
860 lua_settop(L, 3);
|
jbe@130
|
861 lua_rawset(L, 1);
|
jbe@148
|
862 // return nothing:
|
jbe@148
|
863 return 0;
|
jbe@121
|
864 }
|
jbe@121
|
865
|
jbe@135
|
866 static int json_pairs_iterfunc(lua_State *L) {
|
jbe@149
|
867 // stack shall contain two function arguments:
|
jbe@135
|
868 lua_settop(L, 2);
|
jbe@155
|
869 // get corresponding shadow table for first argument:
|
jbe@144
|
870 json_regfetch(L, shadowtbl);
|
jbe@135
|
871 lua_pushvalue(L, 1);
|
jbe@155
|
872 lua_rawget(L, -2);
|
jbe@149
|
873 // throw error if no shadow table was found:
|
jbe@135
|
874 if (lua_isnil(L, -1)) return luaL_error(L, "Shadow table not found");
|
jbe@149
|
875 // get next key value pair from shadow table (using previous key from argument 2)
|
jbe@149
|
876 // and return nothing if there is no next pair:
|
jbe@135
|
877 lua_pushvalue(L, 2);
|
jbe@135
|
878 if (!lua_next(L, -2)) return 0;
|
jbe@149
|
879 // replace null-marker with nil:
|
jbe@155
|
880 if (json_isnullmark(L, -1)) {
|
jbe@135
|
881 lua_pop(L, 1);
|
jbe@135
|
882 lua_pushnil(L);
|
jbe@135
|
883 }
|
jbe@149
|
884 // return key and value (or key and nil, if null-marker was found):
|
jbe@135
|
885 return 2;
|
jbe@135
|
886 }
|
jbe@135
|
887
|
jbe@149
|
888 // returns a triple such that 'for key, value in pairs(obj) do ... end'
|
jbe@149
|
889 // iterates through all key value pairs (including JSON null keys represented as Lua nil):
|
jbe@135
|
890 static int json_pairs(lua_State *L) {
|
jbe@172
|
891 // require one argument to function
|
jbe@172
|
892 luaL_checkany(L, 1);
|
jbe@149
|
893 // return triple of function json_pairs_iterfunc, first argument, and nil:
|
jbe@139
|
894 lua_pushcfunction(L, json_pairs_iterfunc);
|
jbe@135
|
895 lua_pushvalue(L, 1);
|
jbe@135
|
896 lua_pushnil(L);
|
jbe@135
|
897 return 3;
|
jbe@135
|
898 }
|
jbe@135
|
899
|
jbe@134
|
900 static int json_ipairs_iterfunc(lua_State *L) {
|
jbe@152
|
901 lua_Integer idx;
|
jbe@149
|
902 // stack shall contain two function arguments:
|
jbe@134
|
903 lua_settop(L, 2);
|
jbe@149
|
904 // calculate new index by incrementing second argument:
|
jbe@134
|
905 idx = lua_tointeger(L, 2) + 1;
|
jbe@149
|
906 // get corresponding shadow table for first argument:
|
jbe@155
|
907 json_regfetch(L, shadowtbl);
|
jbe@134
|
908 lua_pushvalue(L, 1);
|
jbe@155
|
909 lua_rawget(L, -2);
|
jbe@149
|
910 // throw error if no shadow table was found:
|
jbe@134
|
911 if (lua_isnil(L, -1)) return luaL_error(L, "Shadow table not found");
|
jbe@149
|
912 // do integer lookup in shadow table:
|
jbe@134
|
913 lua_rawgeti(L, -1, idx);
|
jbe@149
|
914 // return nothing if there was no value:
|
jbe@134
|
915 if (lua_isnil(L, -1)) return 0;
|
jbe@149
|
916 // return new index and
|
jbe@149
|
917 // either the looked up value if it is not equal to the null-marker
|
jbe@149
|
918 // or nil instead of null-marker:
|
jbe@134
|
919 lua_pushinteger(L, idx);
|
jbe@155
|
920 if (json_isnullmark(L, -2)) lua_pushnil(L);
|
jbe@134
|
921 else lua_pushvalue(L, -2);
|
jbe@134
|
922 return 2;
|
jbe@134
|
923 }
|
jbe@134
|
924
|
jbe@149
|
925 // returns a triple such that 'for idx, value in ipairs(ary) do ... end'
|
jbe@149
|
926 // iterates through all values (including JSON null represented as Lua nil):
|
jbe@134
|
927 static int json_ipairs(lua_State *L) {
|
jbe@172
|
928 // require one argument to function
|
jbe@172
|
929 luaL_checkany(L, 1);
|
jbe@149
|
930 // return triple of function json_ipairs_iterfunc, first argument, and zero:
|
jbe@139
|
931 lua_pushcfunction(L, json_ipairs_iterfunc);
|
jbe@134
|
932 lua_pushvalue(L, 1);
|
jbe@134
|
933 lua_pushinteger(L, 0);
|
jbe@134
|
934 return 3;
|
jbe@134
|
935 }
|
jbe@134
|
936
|
jbe@163
|
937 typedef struct {
|
jbe@163
|
938 size_t length;
|
jbe@163
|
939 const char *data;
|
jbe@163
|
940 } json_key_t;
|
jbe@163
|
941
|
jbe@163
|
942 static int json_key_cmp(json_key_t *key1, json_key_t *key2) {
|
jbe@163
|
943 size_t pos = 0;
|
jbe@163
|
944 unsigned char c1, c2;
|
jbe@163
|
945 while (1) {
|
jbe@163
|
946 if (key1->length > pos) {
|
jbe@163
|
947 if (key2->length > pos) {
|
jbe@163
|
948 c1 = key1->data[pos];
|
jbe@163
|
949 c2 = key2->data[pos];
|
jbe@163
|
950 if (c1 < c2) return -1;
|
jbe@163
|
951 else if (c1 > c2) return 1;
|
jbe@163
|
952 } else {
|
jbe@163
|
953 return 1;
|
jbe@163
|
954 }
|
jbe@163
|
955 } else {
|
jbe@163
|
956 if (key2->length > pos) {
|
jbe@163
|
957 return -1;
|
jbe@163
|
958 } else {
|
jbe@163
|
959 return 0;
|
jbe@163
|
960 }
|
jbe@163
|
961 }
|
jbe@163
|
962 pos++;
|
jbe@163
|
963 }
|
jbe@163
|
964 }
|
jbe@163
|
965
|
jbe@154
|
966 #define JSON_TABLETYPE_UNKNOWN 0
|
jbe@154
|
967 #define JSON_TABLETYPE_OBJECT 1
|
jbe@154
|
968 #define JSON_TABLETYPE_ARRAY 2
|
jbe@154
|
969
|
jbe@164
|
970 #define json_export_internal_indentstring_idx 1
|
jbe@164
|
971 #define json_export_internal_level_idx 2
|
jbe@164
|
972 #define json_export_internal_value_idx 3
|
jbe@164
|
973 #define json_export_internal_tmp_idx 4
|
jbe@164
|
974
|
jbe@164
|
975 static int json_export_internal(lua_State *L) {
|
jbe@164
|
976 int level;
|
jbe@164
|
977 int pretty;
|
jbe@164
|
978 int i;
|
jbe@154
|
979 lua_Number num;
|
jbe@154
|
980 const char *str;
|
jbe@154
|
981 unsigned char c;
|
jbe@154
|
982 size_t strlen;
|
jbe@154
|
983 size_t pos = 0;
|
jbe@154
|
984 luaL_Buffer buf;
|
jbe@154
|
985 char hexcode[7]; // backslash, character 'u', 4 hex digits, and terminating NULL byte
|
jbe@154
|
986 int tabletype = JSON_TABLETYPE_UNKNOWN;
|
jbe@164
|
987 int anyelement = 0;
|
jbe@163
|
988 size_t keycount = 0;
|
jbe@163
|
989 size_t keypos = 0;
|
jbe@165
|
990 json_key_t *keybuf = NULL;
|
jbe@154
|
991 lua_Integer idx;
|
jbe@164
|
992 lua_settop(L, json_export_internal_value_idx);
|
jbe@164
|
993 if (json_isnullmark(L, json_export_internal_value_idx)) {
|
jbe@164
|
994 lua_pop(L, 1);
|
jbe@157
|
995 lua_pushnil(L);
|
jbe@157
|
996 }
|
jbe@164
|
997 switch (lua_type(L, json_export_internal_value_idx)) {
|
jbe@154
|
998 case LUA_TNIL:
|
jbe@154
|
999 lua_pushliteral(L, "null");
|
jbe@154
|
1000 return 1;
|
jbe@154
|
1001 case LUA_TNUMBER:
|
jbe@164
|
1002 num = lua_tonumber(L, json_export_internal_value_idx);
|
jbe@154
|
1003 if (isnan(num)) return luaL_error(L, "JSON export not possible for NaN value");
|
jbe@154
|
1004 if (isinf(num)) return luaL_error(L, "JSON export not possible for infinite numbers");
|
jbe@164
|
1005 lua_tostring(L, json_export_internal_value_idx);
|
jbe@154
|
1006 return 1;
|
jbe@154
|
1007 case LUA_TBOOLEAN:
|
jbe@164
|
1008 if (lua_toboolean(L, json_export_internal_value_idx)) {
|
jbe@164
|
1009 lua_pushliteral(L, "true");
|
jbe@164
|
1010 } else {
|
jbe@164
|
1011 lua_pushliteral(L, "false");
|
jbe@164
|
1012 }
|
jbe@154
|
1013 return 1;
|
jbe@154
|
1014 case LUA_TSTRING:
|
jbe@164
|
1015 str = lua_tolstring(L, 3, &strlen);
|
jbe@154
|
1016 luaL_buffinit(L, &buf);
|
jbe@154
|
1017 luaL_addchar(&buf, '"');
|
jbe@154
|
1018 while (pos < strlen) {
|
jbe@154
|
1019 c = str[pos++];
|
jbe@154
|
1020 if (c == '"') luaL_addstring(&buf, "\\\"");
|
jbe@154
|
1021 else if (c == '\\') luaL_addstring(&buf, "\\\\");
|
jbe@154
|
1022 else if (c == 127) luaL_addstring(&buf, "\\u007F");
|
jbe@154
|
1023 else if (c >= 32) luaL_addchar(&buf, c);
|
jbe@154
|
1024 else if (c == '\b') luaL_addstring(&buf, "\\b");
|
jbe@154
|
1025 else if (c == '\f') luaL_addstring(&buf, "\\f");
|
jbe@154
|
1026 else if (c == '\n') luaL_addstring(&buf, "\\n");
|
jbe@154
|
1027 else if (c == '\r') luaL_addstring(&buf, "\\r");
|
jbe@154
|
1028 else if (c == '\t') luaL_addstring(&buf, "\\t");
|
jbe@154
|
1029 else if (c == '\v') luaL_addstring(&buf, "\\v");
|
jbe@154
|
1030 else {
|
jbe@154
|
1031 sprintf(hexcode, "\\u%04X", c);
|
jbe@154
|
1032 luaL_addstring(&buf, hexcode);
|
jbe@154
|
1033 }
|
jbe@154
|
1034 }
|
jbe@154
|
1035 luaL_addchar(&buf, '"');
|
jbe@154
|
1036 luaL_pushresult(&buf);
|
jbe@154
|
1037 return 1;
|
jbe@154
|
1038 case LUA_TTABLE:
|
jbe@164
|
1039 if (lua_getmetatable(L, json_export_internal_value_idx)) {
|
jbe@154
|
1040 json_regfetch(L, objectmt);
|
jbe@154
|
1041 if (lua_rawequal(L, -2, -1)) {
|
jbe@154
|
1042 tabletype = JSON_TABLETYPE_OBJECT;
|
jbe@154
|
1043 } else {
|
jbe@154
|
1044 json_regfetch(L, arraymt);
|
jbe@164
|
1045 if (lua_rawequal(L, -3, -1)) {
|
jbe@164
|
1046 tabletype = JSON_TABLETYPE_ARRAY;
|
jbe@164
|
1047 } else {
|
jbe@164
|
1048 return luaL_error(L, "JSON export not possible for tables with nonsupported metatable");
|
jbe@164
|
1049 }
|
jbe@154
|
1050 }
|
jbe@154
|
1051 }
|
jbe@154
|
1052 json_regfetch(L, shadowtbl);
|
jbe@164
|
1053 lua_pushvalue(L, json_export_internal_value_idx);
|
jbe@154
|
1054 lua_rawget(L, -2);
|
jbe@164
|
1055 if (!lua_isnil(L, -1)) lua_replace(L, json_export_internal_value_idx);
|
jbe@164
|
1056 lua_settop(L, json_export_internal_value_idx);
|
jbe@154
|
1057 if (tabletype == JSON_TABLETYPE_UNKNOWN) {
|
jbe@164
|
1058 for (lua_pushnil(L); lua_next(L, json_export_internal_value_idx); lua_pop(L, 1)) {
|
jbe@164
|
1059 switch (lua_type(L, -2)) {
|
jbe@164
|
1060 case LUA_TSTRING:
|
jbe@164
|
1061 keycount++;
|
jbe@164
|
1062 if (tabletype == JSON_TABLETYPE_UNKNOWN) tabletype = JSON_TABLETYPE_OBJECT;
|
jbe@164
|
1063 else if (tabletype == JSON_TABLETYPE_ARRAY) goto json_export_tabletype_error;
|
jbe@164
|
1064 break;
|
jbe@164
|
1065 case LUA_TNUMBER:
|
jbe@164
|
1066 if (tabletype == JSON_TABLETYPE_UNKNOWN) tabletype = JSON_TABLETYPE_ARRAY;
|
jbe@164
|
1067 else if (tabletype == JSON_TABLETYPE_OBJECT) goto json_export_tabletype_error;
|
jbe@164
|
1068 break;
|
jbe@154
|
1069 }
|
jbe@154
|
1070 }
|
jbe@154
|
1071 }
|
jbe@164
|
1072 pretty = lua_toboolean(L, json_export_internal_indentstring_idx);
|
jbe@164
|
1073 level = lua_tointeger(L, json_export_internal_level_idx) + 1;
|
jbe@164
|
1074 if (level > JSON_MAXDEPTH) {
|
jbe@164
|
1075 return luaL_error(L, "More than %d nested JSON levels", JSON_MAXDEPTH);
|
jbe@164
|
1076 }
|
jbe@154
|
1077 switch (tabletype) {
|
jbe@154
|
1078 case JSON_TABLETYPE_OBJECT:
|
jbe@164
|
1079 if (!keycount) {
|
jbe@164
|
1080 for (lua_pushnil(L); lua_next(L, json_export_internal_value_idx); lua_pop(L, 1)) {
|
jbe@164
|
1081 if (lua_type(L, -2) == LUA_TSTRING) keycount++;
|
jbe@164
|
1082 }
|
jbe@163
|
1083 }
|
jbe@163
|
1084 if (keycount) {
|
jbe@163
|
1085 keybuf = calloc(keycount, sizeof(json_key_t));
|
jbe@163
|
1086 if (!keybuf) return luaL_error(L, "Memory allocation failed in JSON library");
|
jbe@164
|
1087 for (lua_pushnil(L); lua_next(L, json_export_internal_value_idx); lua_pop(L, 1)) {
|
jbe@163
|
1088 if (lua_type(L, -2) == LUA_TSTRING) {
|
jbe@163
|
1089 json_key_t *key = keybuf + (keypos++);
|
jbe@163
|
1090 key->data = lua_tolstring(L, -2, &key->length);
|
jbe@163
|
1091 }
|
jbe@163
|
1092 }
|
jbe@163
|
1093 qsort(keybuf, keycount, sizeof(json_key_t), (void *)json_key_cmp);
|
jbe@163
|
1094 }
|
jbe@154
|
1095 luaL_buffinit(L, &buf);
|
jbe@154
|
1096 luaL_addchar(&buf, '{');
|
jbe@163
|
1097 for (keypos=0; keypos<keycount; keypos++) {
|
jbe@163
|
1098 json_key_t *key = keybuf + keypos;
|
jbe@163
|
1099 if (keypos) luaL_addchar(&buf, ',');
|
jbe@164
|
1100 if (pretty) {
|
jbe@164
|
1101 luaL_addchar(&buf, '\n');
|
jbe@164
|
1102 for (i=0; i<level; i++) {
|
jbe@164
|
1103 lua_pushvalue(L, json_export_internal_indentstring_idx);
|
jbe@164
|
1104 luaL_addvalue(&buf);
|
jbe@164
|
1105 }
|
jbe@164
|
1106 }
|
jbe@164
|
1107 lua_pushcfunction(L, json_export_internal);
|
jbe@164
|
1108 lua_pushvalue(L, json_export_internal_indentstring_idx);
|
jbe@164
|
1109 lua_pushinteger(L, level);
|
jbe@163
|
1110 lua_pushlstring(L, key->data, key->length);
|
jbe@164
|
1111 if (lua_pcall(L, 3, 1, 0)) {
|
jbe@163
|
1112 if (keybuf) free(keybuf);
|
jbe@163
|
1113 return lua_error(L);
|
jbe@154
|
1114 }
|
jbe@163
|
1115 luaL_addvalue(&buf);
|
jbe@163
|
1116 luaL_addchar(&buf, ':');
|
jbe@164
|
1117 if (pretty) luaL_addchar(&buf, ' ');
|
jbe@164
|
1118 lua_pushcfunction(L, json_export_internal);
|
jbe@164
|
1119 lua_pushvalue(L, json_export_internal_indentstring_idx);
|
jbe@164
|
1120 lua_pushinteger(L, level);
|
jbe@163
|
1121 lua_pushlstring(L, key->data, key->length);
|
jbe@164
|
1122 lua_rawget(L, json_export_internal_value_idx);
|
jbe@164
|
1123 if (lua_pcall(L, 3, 1, 0)) {
|
jbe@163
|
1124 if (keybuf) free(keybuf);
|
jbe@163
|
1125 return lua_error(L);
|
jbe@163
|
1126 }
|
jbe@163
|
1127 luaL_addvalue(&buf);
|
jbe@154
|
1128 }
|
jbe@163
|
1129 if (keybuf) free(keybuf);
|
jbe@164
|
1130 if (pretty && keycount != 0) {
|
jbe@164
|
1131 luaL_addchar(&buf, '\n');
|
jbe@164
|
1132 for (i=0; i<level-1; i++) {
|
jbe@164
|
1133 lua_pushvalue(L, json_export_internal_indentstring_idx);
|
jbe@164
|
1134 luaL_addvalue(&buf);
|
jbe@164
|
1135 }
|
jbe@164
|
1136 }
|
jbe@154
|
1137 luaL_addchar(&buf, '}');
|
jbe@164
|
1138 if (pretty && level == 1) luaL_addchar(&buf, '\n');
|
jbe@154
|
1139 luaL_pushresult(&buf);
|
jbe@154
|
1140 return 1;
|
jbe@154
|
1141 case JSON_TABLETYPE_ARRAY:
|
jbe@164
|
1142 lua_settop(L, json_export_internal_tmp_idx);
|
jbe@154
|
1143 luaL_buffinit(L, &buf);
|
jbe@154
|
1144 luaL_addchar(&buf, '[');
|
jbe@154
|
1145 for (idx = 1; ; idx++) {
|
jbe@164
|
1146 lua_rawgeti(L, json_export_internal_value_idx, idx);
|
jbe@154
|
1147 if (lua_isnil(L, -1)) {
|
jbe@154
|
1148 lua_pop(L, 1);
|
jbe@154
|
1149 break;
|
jbe@154
|
1150 }
|
jbe@164
|
1151 lua_replace(L, json_export_internal_tmp_idx);
|
jbe@164
|
1152 if (anyelement) luaL_addchar(&buf, ',');
|
jbe@164
|
1153 anyelement = 1;
|
jbe@164
|
1154 if (pretty) {
|
jbe@164
|
1155 luaL_addchar(&buf, '\n');
|
jbe@164
|
1156 for (i=0; i<level; i++) {
|
jbe@164
|
1157 lua_pushvalue(L, json_export_internal_indentstring_idx);
|
jbe@164
|
1158 luaL_addvalue(&buf);
|
jbe@164
|
1159 }
|
jbe@164
|
1160 }
|
jbe@164
|
1161 lua_pushcfunction(L, json_export_internal);
|
jbe@164
|
1162 lua_pushvalue(L, json_export_internal_indentstring_idx);
|
jbe@164
|
1163 lua_pushinteger(L, level);
|
jbe@164
|
1164 lua_pushvalue(L, json_export_internal_tmp_idx);
|
jbe@164
|
1165 lua_call(L, 3, 1);
|
jbe@154
|
1166 luaL_addvalue(&buf);
|
jbe@154
|
1167 }
|
jbe@164
|
1168 if (pretty && anyelement) {
|
jbe@164
|
1169 luaL_addchar(&buf, '\n');
|
jbe@164
|
1170 for (i=0; i<level-1; i++) {
|
jbe@164
|
1171 lua_pushvalue(L, json_export_internal_indentstring_idx);
|
jbe@164
|
1172 luaL_addvalue(&buf);
|
jbe@164
|
1173 }
|
jbe@164
|
1174 }
|
jbe@154
|
1175 luaL_addchar(&buf, ']');
|
jbe@164
|
1176 if (pretty && level == 1) luaL_addchar(&buf, '\n');
|
jbe@154
|
1177 luaL_pushresult(&buf);
|
jbe@154
|
1178 return 1;
|
jbe@154
|
1179 }
|
jbe@154
|
1180 json_export_tabletype_error:
|
jbe@154
|
1181 return luaL_error(L, "JSON export not possible for ambiguous table (cannot decide whether it is an object or array)");
|
jbe@154
|
1182 }
|
jbe@166
|
1183 return luaL_error(L, "JSON export not possible for values of type \"%s\"", lua_typename(L, lua_type(L, json_export_internal_value_idx)));
|
jbe@154
|
1184 }
|
jbe@154
|
1185
|
jbe@164
|
1186 static int json_export(lua_State *L) {
|
jbe@164
|
1187 lua_settop(L, 1);
|
jbe@164
|
1188 lua_pushcfunction(L, json_export_internal);
|
jbe@164
|
1189 lua_pushnil(L);
|
jbe@164
|
1190 lua_pushinteger(L, 0);
|
jbe@164
|
1191 lua_pushvalue(L, 1);
|
jbe@164
|
1192 lua_call(L, 3, 1);
|
jbe@164
|
1193 return 1;
|
jbe@164
|
1194 }
|
jbe@164
|
1195
|
jbe@164
|
1196 static int json_pretty(lua_State *L) {
|
jbe@164
|
1197 lua_settop(L, 2);
|
jbe@164
|
1198 lua_pushcfunction(L, json_export_internal);
|
jbe@164
|
1199 if (lua_isnil(L, 2)) lua_pushliteral(L, " ");
|
jbe@164
|
1200 else lua_pushvalue(L, 2);
|
jbe@164
|
1201 lua_pushinteger(L, 0);
|
jbe@164
|
1202 lua_pushvalue(L, 1);
|
jbe@164
|
1203 lua_call(L, 3, 1);
|
jbe@164
|
1204 return 1;
|
jbe@164
|
1205 }
|
jbe@164
|
1206
|
jbe@149
|
1207 // functions in library module:
|
jbe@121
|
1208 static const struct luaL_Reg json_module_functions[] = {
|
jbe@133
|
1209 {"object", json_object},
|
jbe@173
|
1210 {"array", json_array},
|
jbe@121
|
1211 {"import", json_import},
|
jbe@154
|
1212 {"export", json_export},
|
jbe@164
|
1213 {"pretty", json_pretty},
|
jbe@173
|
1214 {"get", json_get},
|
jbe@173
|
1215 {"type", json_type},
|
jbe@173
|
1216 {"set", json_set},
|
jbe@121
|
1217 {NULL, NULL}
|
jbe@121
|
1218 };
|
jbe@121
|
1219
|
jbe@149
|
1220 // metamethods for JSON objects, JSON arrays, and unknown JSON collections (object or array):
|
jbe@126
|
1221 static const struct luaL_Reg json_metatable_functions[] = {
|
jbe@130
|
1222 {"__len", json_len},
|
jbe@130
|
1223 {"__index", json_index},
|
jbe@130
|
1224 {"__newindex", json_newindex},
|
jbe@135
|
1225 {"__pairs", json_pairs},
|
jbe@134
|
1226 {"__ipairs", json_ipairs},
|
jbe@160
|
1227 {"__tostring", json_export},
|
jbe@126
|
1228 {NULL, NULL}
|
jbe@126
|
1229 };
|
jbe@126
|
1230
|
jbe@157
|
1231 // metamethods for JSON null marker:
|
jbe@157
|
1232 static const struct luaL_Reg json_nullmark_metamethods[] = {
|
jbe@157
|
1233 {"__tostring", json_nullmark_tostring},
|
jbe@157
|
1234 {NULL, NULL}
|
jbe@157
|
1235 };
|
jbe@157
|
1236
|
jbe@149
|
1237 // initializes json library:
|
jbe@121
|
1238 int luaopen_json(lua_State *L) {
|
jbe@149
|
1239 // empty stack:
|
jbe@126
|
1240 lua_settop(L, 0);
|
jbe@149
|
1241 // push library module onto stack position 1:
|
jbe@149
|
1242 lua_newtable(L);
|
jbe@149
|
1243 // register library functions:
|
jbe@149
|
1244 luaL_setfuncs(L, json_module_functions, 0);
|
jbe@149
|
1245 // create and store objectmt:
|
jbe@138
|
1246 lua_newtable(L);
|
jbe@138
|
1247 luaL_setfuncs(L, json_metatable_functions, 0);
|
jbe@144
|
1248 json_regstore(L, objectmt);
|
jbe@149
|
1249 // create and store arraymt:
|
jbe@138
|
1250 lua_newtable(L);
|
jbe@138
|
1251 luaL_setfuncs(L, json_metatable_functions, 0);
|
jbe@144
|
1252 json_regstore(L, arraymt);
|
jbe@149
|
1253 // create and store ephemeron table to store shadow tables for each JSON object/array
|
jbe@149
|
1254 // to allow NULL values returned as nil
|
jbe@149
|
1255 lua_newtable(L);
|
jbe@138
|
1256 lua_newtable(L); // metatable for ephemeron table
|
jbe@121
|
1257 lua_pushliteral(L, "__mode");
|
jbe@121
|
1258 lua_pushliteral(L, "k");
|
jbe@138
|
1259 lua_rawset(L, -3);
|
jbe@138
|
1260 lua_setmetatable(L, -2);
|
jbe@144
|
1261 json_regstore(L, shadowtbl);
|
jbe@157
|
1262 // set metatable of null marker and make it available through library module:
|
jbe@157
|
1263 json_pushnullmark(L);
|
jbe@157
|
1264 lua_newtable(L);
|
jbe@157
|
1265 luaL_setfuncs(L, json_nullmark_metamethods, 0);
|
jbe@157
|
1266 lua_setmetatable(L, -2);
|
jbe@157
|
1267 lua_setfield(L, 1, "null");
|
jbe@157
|
1268 // return library module (that's expected on top of stack):
|
jbe@121
|
1269 return 1;
|
jbe@121
|
1270 }
|