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
|
4 #include <string.h>
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5
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jbe@130
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6 #define JSON_UPVAL_NULLMARK lua_upvalueindex(1)
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jbe@130
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7 #define JSON_UPVAL_SHADOWTBL lua_upvalueindex(2)
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jbe@130
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8 #define JSON_UPVAL_TYPES lua_upvalueindex(3)
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jbe@130
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9 #define JSON_UPVAL_METATABLE lua_upvalueindex(4)
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jbe@135
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10 #define JSON_UPVAL_PAIRS_ITERFUNC lua_upvalueindex(5)
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jbe@135
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11 #define JSON_UPVAL_IPAIRS_ITERFUNC lua_upvalueindex(6)
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jbe@123
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12
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jbe@136
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13 // marks a table as JSON object or JSON array:
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jbe@136
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14 // (returns its modified argument or a new table if argument is nil)
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jbe@136
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15 static int json_mark(lua_State *L, const char *marker) {
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jbe@136
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16 // if argument is nil, then create new table:
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jbe@136
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17 if (lua_isnoneornil(L, 1)) {
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jbe@136
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18 lua_settop(L, 0);
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jbe@136
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19 lua_newtable(L);
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jbe@136
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20 // skip testing of existing shadow table:
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jbe@136
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21 goto json_object_create_shadow_table;
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jbe@136
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22 }
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jbe@136
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23 lua_pushvalue(L, 1);
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jbe@136
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24 lua_rawget(L, JSON_UPVAL_SHADOWTBL);
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jbe@136
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25 if (lua_isnil(L, -1)) {
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jbe@136
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26 json_object_create_shadow_table:
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jbe@136
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27 // set shadow table:
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jbe@136
|
28 lua_pushvalue(L, 1);
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jbe@136
|
29 lua_newtable(L);
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jbe@136
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30 lua_rawset(L, JSON_UPVAL_SHADOWTBL);
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jbe@136
|
31 }
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jbe@136
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32 // set metatable:
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jbe@136
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33 lua_pushvalue(L, JSON_UPVAL_METATABLE);
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jbe@136
|
34 lua_setmetatable(L, 1);
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jbe@136
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35 // mark table as JSON object or as JSON array
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jbe@136
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36 lua_pushvalue(L, 1);
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jbe@136
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37 lua_pushstring(L, marker);
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jbe@136
|
38 lua_rawset(L, JSON_UPVAL_TYPES);
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jbe@136
|
39 return 1;
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jbe@136
|
40 }
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jbe@136
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41
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jbe@136
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42 // marks a table as JSON object:
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jbe@136
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43 // (returns its modified argument or a new table if argument is nil)
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jbe@136
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44 static int json_object(lua_State *L) {
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jbe@136
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45 return json_mark(L, "object");
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jbe@136
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46 }
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jbe@136
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47
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jbe@136
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48 // marks a table as JSON array:
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jbe@136
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49 // (returns its modified argument or a new table if argument is nil)
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jbe@136
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50 static int json_array(lua_State *L) {
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jbe@136
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51 return json_mark(L, "array");
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jbe@136
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52 }
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53
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jbe@124
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54 #define JSON_STATE_VALUE 0
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jbe@124
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55 #define JSON_STATE_OBJECT_KEY 1
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jbe@124
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56 #define JSON_STATE_OBJECT_KEY_TERMINATOR 2
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jbe@124
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57 #define JSON_STATE_OBJECT_VALUE 3
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jbe@124
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58 #define JSON_STATE_OBJECT_SEPARATOR 4
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jbe@124
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59 #define JSON_STATE_ARRAY_VALUE 5
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jbe@124
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60 #define JSON_STATE_ARRAY_SEPARATOR 6
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jbe@124
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61 #define JSON_STATE_END 7
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jbe@121
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62
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jbe@136
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63 // decodes a JSON document:
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jbe@121
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64 static int json_import(lua_State *L) {
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65 const char *str; // string to parse
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66 size_t total; // total length of string to parse
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67 size_t pos = 0; // current position in string to parse
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68 size_t level = 0; // nested levels of objects/arrays currently being processed
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jbe@136
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69 int mode = JSON_STATE_VALUE; // state of parser
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jbe@136
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70 char c; // variable to store a single character to be processed
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jbe@136
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71 luaL_Buffer luabuf; // Lua buffer to decode (possibly escaped) strings
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72 char *cbuf; // C buffer to decode (possibly escaped) strings
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jbe@136
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73 size_t writepos; // write position of decoded strings in C buffer
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jbe@136
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74 // require string as first argument:
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jbe@136
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75 str = luaL_checklstring(L, 1, &total);
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jbe@136
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76 // if string contains a NULL byte, this is a syntax error
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jbe@136
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77 if (strlen(str) != total) goto json_import_syntax_error;
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jbe@136
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78 // main loop of parser:
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jbe@136
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79 json_import_loop:
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jbe@136
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80 // skip whitespace and store next character in variable 'c':
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jbe@121
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81 while (c = str[pos], c == ' ' || c == '\n' || c == '\r' || c == '\t' || c == '\f') pos++;
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jbe@136
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82 // switch statement to handle certain (single) characters:
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jbe@121
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83 switch (c) {
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jbe@136
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84 // handle end of JSON document:
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jbe@121
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85 case 0:
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jbe@136
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86 // if end of JSON document was expected, then return top element of stack as result:
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jbe@124
|
87 if (mode == JSON_STATE_END) return 1;
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jbe@136
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88 // otherwise, the JSON document was malformed:
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jbe@121
|
89 json_import_unexpected_eof:
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jbe@121
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90 lua_pushnil(L);
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jbe@121
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91 if (level == 0) lua_pushliteral(L, "Empty string");
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jbe@121
|
92 else lua_pushliteral(L, "Unexpected end of JSON document");
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jbe@121
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93 return 2;
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jbe@136
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94 // new JSON object:
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jbe@121
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95 case '{':
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jbe@136
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96 // if a JSON object is not expected here, then return an error:
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jbe@124
|
97 if (mode != JSON_STATE_VALUE && mode != JSON_STATE_OBJECT_VALUE && mode != JSON_STATE_ARRAY_VALUE)
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jbe@121
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98 goto json_import_syntax_error;
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jbe@136
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99 // consume input character:
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jbe@121
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100 pos++;
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jbe@136
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101 // create JSON object on stack:
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jbe@136
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102 lua_newtable(L);
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jbe@136
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103 // set metatable of JSON object:
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jbe@125
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104 lua_pushvalue(L, JSON_UPVAL_METATABLE);
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jbe@125
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105 lua_setmetatable(L, -2);
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jbe@136
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106 // mark JSON object as JSON object (as opposed to JSON array):
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jbe@127
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107 lua_pushvalue(L, -1);
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jbe@127
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108 lua_pushliteral(L, "object");
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jbe@127
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109 lua_rawset(L, JSON_UPVAL_TYPES);
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jbe@136
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110 // create internal shadow table on stack:
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jbe@136
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111 lua_newtable(L);
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jbe@136
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112 // register internal shadow table:
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jbe@123
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113 lua_pushvalue(L, -2);
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jbe@123
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114 lua_pushvalue(L, -2);
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jbe@130
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115 lua_rawset(L, JSON_UPVAL_SHADOWTBL);
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jbe@136
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116 // increment level:
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jbe@121
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117 level++;
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jbe@136
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118 // expect object key (or end of object) and continue with loop:
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jbe@136
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119 mode = JSON_STATE_OBJECT_KEY;
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jbe@121
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120 goto json_import_loop;
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jbe@136
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121 // new JSON array:
|
jbe@121
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122 case '[':
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jbe@136
|
123 // if a JSON array is not expected here, then return an error:
|
jbe@124
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124 if (mode != JSON_STATE_VALUE && mode != JSON_STATE_OBJECT_VALUE && mode != JSON_STATE_ARRAY_VALUE)
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jbe@121
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125 goto json_import_syntax_error;
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jbe@136
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126 // consume input character:
|
jbe@121
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127 pos++;
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jbe@136
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128 // create JSON array on stack:
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jbe@136
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129 lua_newtable(L);
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jbe@136
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130 // set metatable of JSON array:
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jbe@125
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131 lua_pushvalue(L, JSON_UPVAL_METATABLE);
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jbe@125
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132 lua_setmetatable(L, -2);
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jbe@136
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133 // mark JSON array as JSON array (as opposed to JSON object):
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jbe@127
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134 lua_pushvalue(L, -1);
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jbe@127
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135 lua_pushliteral(L, "array");
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jbe@127
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136 lua_rawset(L, JSON_UPVAL_TYPES);
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jbe@136
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137 // create internal shadow table on stack:
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jbe@136
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138 lua_newtable(L);
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jbe@136
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139 // register internal shadow table:
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jbe@123
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140 lua_pushvalue(L, -2);
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jbe@123
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141 lua_pushvalue(L, -2);
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jbe@130
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142 lua_rawset(L, JSON_UPVAL_SHADOWTBL);
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jbe@136
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143 // increment level:
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jbe@121
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144 level++;
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jbe@136
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145 // expect array value (or end of array) and continue with loop:
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jbe@136
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146 mode = JSON_STATE_ARRAY_VALUE;
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jbe@121
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147 goto json_import_loop;
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jbe@136
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148 // end of JSON object:
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jbe@121
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149 case '}':
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jbe@136
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150 // if end of JSON object is not expected here, then return an error:
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jbe@124
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151 if (mode != JSON_STATE_OBJECT_KEY && mode != JSON_STATE_OBJECT_SEPARATOR)
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jbe@121
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152 goto json_import_syntax_error;
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jbe@136
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153 // jump to common code for end of JSON object and JSON array:
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jbe@121
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154 goto json_import_close;
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jbe@136
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155 // end of JSON array:
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jbe@121
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156 case ']':
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jbe@136
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157 // if end of JSON array is not expected here, then return an error:
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jbe@124
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158 if (mode != JSON_STATE_ARRAY_VALUE && mode != JSON_STATE_ARRAY_SEPARATOR)
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jbe@121
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159 goto json_import_syntax_error;
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jbe@136
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160 // continue with common code for end of JSON object and JSON array:
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jbe@136
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161 // common code for end of JSON object or JSON array:
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jbe@121
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162 json_import_close:
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jbe@136
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163 // consume input character:
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jbe@121
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164 pos++;
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jbe@136
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165 // pop shadow table:
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jbe@136
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166 lua_pop(L, 1);
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jbe@136
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167 // check if nested:
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jbe@121
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168 if (--level) {
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jbe@136
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169 // if nested, then check if outer(!) structure is an array or object:
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jbe@136
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170 lua_pushvalue(L, c == '}' ? -4 : -3);
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jbe@136
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171 lua_rawget(L, JSON_UPVAL_TYPES);
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jbe@136
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172 if (lua_tostring(L, -1)[0] == 'a') {
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jbe@136
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173 // select array value processing:
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jbe@124
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174 mode = JSON_STATE_ARRAY_VALUE;
|
jbe@121
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175 } else {
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jbe@136
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176 // select object value processing:
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jbe@124
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177 mode = JSON_STATE_OBJECT_VALUE;
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jbe@121
|
178 }
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jbe@136
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179 // pop JSON type from stack (from rawget JSON_UPVAL_TYPES):
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jbe@136
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180 lua_pop(L, 1);
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jbe@136
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181 // store value in outer structure:
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jbe@121
|
182 goto json_import_process_value;
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jbe@121
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183 }
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jbe@136
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184 // if not nested, then expect end of JSON document and continue with loop:
|
jbe@136
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185 mode = JSON_STATE_END;
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jbe@121
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186 goto json_import_loop;
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jbe@136
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187 // key terminator:
|
jbe@121
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188 case ':':
|
jbe@136
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189 // if key terminator is not expected here, then return an error:
|
jbe@124
|
190 if (mode != JSON_STATE_OBJECT_KEY_TERMINATOR)
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jbe@121
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191 goto json_import_syntax_error;
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jbe@136
|
192 // consume input character:
|
jbe@121
|
193 pos++;
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jbe@136
|
194 // set state of parser and continue with loop:
|
jbe@124
|
195 mode = JSON_STATE_OBJECT_VALUE;
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jbe@121
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196 goto json_import_loop;
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jbe@136
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197 // value terminator (NOTE: trailing comma at end of value or key-value list is tolerated by this parser)
|
jbe@121
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198 case ',':
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jbe@136
|
199 // change parser state accordingly:
|
jbe@124
|
200 if (mode == JSON_STATE_OBJECT_SEPARATOR) {
|
jbe@124
|
201 mode = JSON_STATE_OBJECT_KEY;
|
jbe@124
|
202 } else if (mode == JSON_STATE_ARRAY_SEPARATOR) {
|
jbe@124
|
203 mode = JSON_STATE_ARRAY_VALUE;
|
jbe@121
|
204 } else {
|
jbe@136
|
205 // if value terminator is not expected here, then return an error:
|
jbe@136
|
206 goto json_import_syntax_error;
|
jbe@121
|
207 }
|
jbe@136
|
208 // consume input character:
|
jbe@121
|
209 pos++;
|
jbe@136
|
210 // continue with loop:
|
jbe@121
|
211 goto json_import_loop;
|
jbe@136
|
212 // string literal:
|
jbe@121
|
213 case '"':
|
jbe@136
|
214 // prepare buffer to decode string (with maximum possible length) and set write position to zero:
|
jbe@121
|
215 cbuf = luaL_buffinitsize(L, &luabuf, total-pos);
|
jbe@121
|
216 writepos = 0;
|
jbe@136
|
217 // consume quote character:
|
jbe@121
|
218 pos++;
|
jbe@136
|
219 // read next character until encountering end quote:
|
jbe@121
|
220 while ((c = str[pos++]) != '"') {
|
jbe@121
|
221 if (c == 0) {
|
jbe@136
|
222 // handle unexpected end-of-string:
|
jbe@121
|
223 goto json_import_unexpected_eof;
|
jbe@121
|
224 } else if (c < 32 || c == 127) {
|
jbe@136
|
225 // do not allow ASCII control characters:
|
jbe@136
|
226 // NOTE: illegal UTF-8 sequences and extended control characters are not sanitized
|
jbe@136
|
227 // by this parser to allow different encodings than Unicode
|
jbe@121
|
228 lua_pushnil(L);
|
jbe@121
|
229 lua_pushliteral(L, "Unexpected control character in JSON string");
|
jbe@121
|
230 return 2;
|
jbe@121
|
231 } else if (c == '\\') {
|
jbe@136
|
232 // read next char after backslash escape:
|
jbe@121
|
233 c = str[pos++];
|
jbe@121
|
234 switch (c) {
|
jbe@136
|
235 // unexpected end-of-string:
|
jbe@121
|
236 case 0:
|
jbe@121
|
237 goto json_import_unexpected_eof;
|
jbe@136
|
238 // unescaping of quotation mark, slash, and backslash:
|
jbe@121
|
239 case '"':
|
jbe@121
|
240 case '/':
|
jbe@121
|
241 case '\\':
|
jbe@121
|
242 cbuf[writepos++] = c;
|
jbe@121
|
243 break;
|
jbe@136
|
244 // unescaping of backspace:
|
jbe@121
|
245 case 'b':
|
jbe@121
|
246 cbuf[writepos++] = '\b';
|
jbe@121
|
247 break;
|
jbe@136
|
248 // unescaping of form-feed:
|
jbe@121
|
249 case 'f':
|
jbe@121
|
250 cbuf[writepos++] = '\f';
|
jbe@121
|
251 break;
|
jbe@136
|
252 // unescaping of new-line:
|
jbe@121
|
253 case 'n':
|
jbe@121
|
254 cbuf[writepos++] = '\n';
|
jbe@121
|
255 break;
|
jbe@136
|
256 // unescaping of carriage-return:
|
jbe@121
|
257 case 'r':
|
jbe@121
|
258 cbuf[writepos++] = '\r';
|
jbe@121
|
259 break;
|
jbe@136
|
260 // unescaping of tabulator:
|
jbe@121
|
261 case 't':
|
jbe@121
|
262 cbuf[writepos++] = '\t';
|
jbe@121
|
263 break;
|
jbe@136
|
264 // unescaping of UTF-16 characters
|
jbe@121
|
265 case 'u':
|
jbe@121
|
266 lua_pushnil(L);
|
jbe@121
|
267 lua_pushliteral(L, "JSON unicode escape sequences are not implemented yet"); // TODO
|
jbe@121
|
268 return 2;
|
jbe@136
|
269 // unexpected escape sequence:
|
jbe@121
|
270 default:
|
jbe@121
|
271 lua_pushnil(L);
|
jbe@121
|
272 lua_pushliteral(L, "Unexpected string escape sequence in JSON document");
|
jbe@121
|
273 return 2;
|
jbe@121
|
274 }
|
jbe@121
|
275 } else {
|
jbe@136
|
276 // normal character:
|
jbe@121
|
277 cbuf[writepos++] = c;
|
jbe@121
|
278 }
|
jbe@121
|
279 }
|
jbe@136
|
280 // process buffer to Lua string:
|
jbe@121
|
281 luaL_pushresultsize(&luabuf, writepos);
|
jbe@136
|
282 // continue with processing of decoded string:
|
jbe@121
|
283 goto json_import_process_value;
|
jbe@121
|
284 }
|
jbe@136
|
285 // process values whose type is is not deducible from a single character:
|
jbe@136
|
286 if ((c >= '0' && c <= '9') || c == '-' || c == '+') {
|
jbe@136
|
287 // numbers:
|
jbe@122
|
288 char *endptr;
|
jbe@122
|
289 double numval;
|
jbe@122
|
290 numval = strtod(str+pos, &endptr);
|
jbe@122
|
291 if (endptr == str+pos) goto json_import_syntax_error;
|
jbe@122
|
292 pos += endptr - (str+pos);
|
jbe@122
|
293 lua_pushnumber(L, numval);
|
jbe@122
|
294 } else if (!strncmp(str+pos, "true", 4)) {
|
jbe@136
|
295 // consume 4 input characters for "true":
|
jbe@121
|
296 pos += 4;
|
jbe@136
|
297 // put Lua true value on stack:
|
jbe@136
|
298 lua_pushboolean(L, 1);
|
jbe@121
|
299 } else if (!strncmp(str+pos, "false", 5)) {
|
jbe@136
|
300 // consume 5 input characters for "false":
|
jbe@121
|
301 pos += 5;
|
jbe@136
|
302 // put Lua false value on stack:
|
jbe@136
|
303 lua_pushboolean(L, 0);
|
jbe@121
|
304 } else if (!strncmp(str+pos, "null", 4)) {
|
jbe@136
|
305 // consume 4 input characters for "null":
|
jbe@136
|
306 pos += 4;
|
jbe@136
|
307 // put special null-marker on stack:
|
jbe@130
|
308 lua_pushvalue(L, JSON_UPVAL_NULLMARK);
|
jbe@121
|
309 } else {
|
jbe@136
|
310 // all other cases are a syntax error:
|
jbe@121
|
311 goto json_import_syntax_error;
|
jbe@121
|
312 }
|
jbe@136
|
313 // process a decoded value or key value pair (expected on top of Lua stack):
|
jbe@136
|
314 json_import_process_value:
|
jbe@121
|
315 switch (mode) {
|
jbe@136
|
316 // an object key has been read:
|
jbe@124
|
317 case JSON_STATE_OBJECT_KEY:
|
jbe@136
|
318 // if an object key is not a string, then this is a syntax error:
|
jbe@121
|
319 if (lua_type(L, -1) != LUA_TSTRING) goto json_import_syntax_error;
|
jbe@136
|
320 // expect key terminator and continue with loop:
|
jbe@124
|
321 mode = JSON_STATE_OBJECT_KEY_TERMINATOR;
|
jbe@121
|
322 goto json_import_loop;
|
jbe@136
|
323 // a key value pair has been read:
|
jbe@124
|
324 case JSON_STATE_OBJECT_VALUE:
|
jbe@136
|
325 // store key value pair in outer shadow table:
|
jbe@130
|
326 lua_rawset(L, -3);
|
jbe@136
|
327 // expect value terminator (or end of object) and continue with loop:
|
jbe@124
|
328 mode = JSON_STATE_OBJECT_SEPARATOR;
|
jbe@121
|
329 goto json_import_loop;
|
jbe@136
|
330 // an array value has been read:
|
jbe@124
|
331 case JSON_STATE_ARRAY_VALUE:
|
jbe@136
|
332 // store value in outer shadow table:
|
jbe@136
|
333 lua_rawseti(L, -2, lua_rawlen(L, -2) + 1);
|
jbe@136
|
334 // expect value terminator (or end of object) and continue with loop:
|
jbe@124
|
335 mode = JSON_STATE_ARRAY_SEPARATOR;
|
jbe@121
|
336 goto json_import_loop;
|
jbe@136
|
337 // a single value has been read:
|
jbe@124
|
338 case JSON_STATE_VALUE:
|
jbe@136
|
339 // leave value on top of stack, expect end of JSON document, and continue with loop:
|
jbe@124
|
340 mode = JSON_STATE_END;
|
jbe@121
|
341 goto json_import_loop;
|
jbe@121
|
342 }
|
jbe@136
|
343 // syntax error handling (only reachable by goto statement):
|
jbe@136
|
344 json_import_syntax_error:
|
jbe@121
|
345 lua_pushnil(L);
|
jbe@121
|
346 lua_pushliteral(L, "Syntax error in JSON document");
|
jbe@121
|
347 return 2;
|
jbe@121
|
348 }
|
jbe@121
|
349
|
jbe@130
|
350 #define JSON_PATH_GET 1
|
jbe@130
|
351 #define JSON_PATH_TYPE 2
|
jbe@130
|
352 #define JSON_PATH_ISNULL 3
|
jbe@130
|
353
|
jbe@136
|
354 // gets a value, its type, or information
|
jbe@130
|
355 static int json_path(lua_State *L, int mode) {
|
jbe@130
|
356 int argc;
|
jbe@130
|
357 int idx = 2;
|
jbe@130
|
358 argc = lua_gettop(L);
|
jbe@126
|
359 lua_pushvalue(L, 1);
|
jbe@130
|
360 while (idx <= argc) {
|
jbe@132
|
361 if (lua_isnil(L, -1)) {
|
jbe@132
|
362 if (mode == JSON_PATH_ISNULL) lua_pushboolean(L, 0);
|
jbe@132
|
363 return 1;
|
jbe@132
|
364 }
|
jbe@130
|
365 lua_pushvalue(L, -1);
|
jbe@130
|
366 lua_rawget(L, JSON_UPVAL_SHADOWTBL);
|
jbe@126
|
367 if (lua_isnil(L, -1)) {
|
jbe@126
|
368 lua_pop(L, 1);
|
jbe@130
|
369 if (lua_type(L, -1) == LUA_TTABLE) {
|
jbe@130
|
370 lua_pushvalue(L, idx++);
|
jbe@130
|
371 lua_gettable(L, -2);
|
jbe@130
|
372 } else {
|
jbe@130
|
373 lua_pushnil(L);
|
jbe@130
|
374 }
|
jbe@130
|
375 } else {
|
jbe@130
|
376 lua_replace(L, -2);
|
jbe@130
|
377 lua_pushvalue(L, idx++);
|
jbe@130
|
378 lua_rawget(L, -2);
|
jbe@126
|
379 }
|
jbe@130
|
380 lua_replace(L, -2);
|
jbe@126
|
381 }
|
jbe@130
|
382 switch (mode) {
|
jbe@130
|
383 case JSON_PATH_GET:
|
jbe@130
|
384 if (lua_rawequal(L, -1, JSON_UPVAL_NULLMARK)) lua_pushnil(L);
|
jbe@130
|
385 return 1;
|
jbe@130
|
386 case JSON_PATH_TYPE:
|
jbe@130
|
387 if (lua_rawequal(L, -1, JSON_UPVAL_NULLMARK)) {
|
jbe@130
|
388 lua_pushliteral(L, "null");
|
jbe@130
|
389 return 1;
|
jbe@126
|
390 }
|
jbe@130
|
391 lua_pushvalue(L, -1);
|
jbe@130
|
392 lua_rawget(L, JSON_UPVAL_TYPES);
|
jbe@130
|
393 if (lua_isnil(L, -1)) lua_pushstring(L, lua_typename(L, lua_type(L, -2)));
|
jbe@130
|
394 return 1;
|
jbe@130
|
395 case JSON_PATH_ISNULL:
|
jbe@130
|
396 lua_pushboolean(L, lua_rawequal(L, -1, JSON_UPVAL_NULLMARK));
|
jbe@130
|
397 return 1;
|
jbe@126
|
398 }
|
jbe@130
|
399 return 0;
|
jbe@130
|
400 }
|
jbe@130
|
401
|
jbe@130
|
402 static int json_get(lua_State *L) {
|
jbe@130
|
403 return json_path(L, JSON_PATH_GET);
|
jbe@130
|
404 }
|
jbe@130
|
405
|
jbe@130
|
406 static int json_type(lua_State *L) {
|
jbe@130
|
407 return json_path(L, JSON_PATH_TYPE);
|
jbe@130
|
408 }
|
jbe@130
|
409
|
jbe@130
|
410 static int json_isnull(lua_State *L) {
|
jbe@130
|
411 return json_path(L, JSON_PATH_ISNULL);
|
jbe@130
|
412 }
|
jbe@130
|
413
|
jbe@131
|
414 static int json_setnull(lua_State *L) {
|
jbe@131
|
415 lua_settop(L, 2);
|
jbe@131
|
416 lua_pushvalue(L, JSON_UPVAL_METATABLE);
|
jbe@131
|
417 lua_setmetatable(L, 1);
|
jbe@131
|
418 lua_pushvalue(L, 1);
|
jbe@131
|
419 lua_rawget(L, JSON_UPVAL_SHADOWTBL);
|
jbe@131
|
420 if (lua_isnil(L, -1)) {
|
jbe@131
|
421 lua_newtable(L);
|
jbe@131
|
422 lua_pushvalue(L, 1);
|
jbe@131
|
423 lua_pushvalue(L, -2);
|
jbe@131
|
424 lua_rawset(L, JSON_UPVAL_SHADOWTBL);
|
jbe@131
|
425 }
|
jbe@131
|
426 lua_pushvalue(L, 2);
|
jbe@131
|
427 lua_pushvalue(L, JSON_UPVAL_NULLMARK);
|
jbe@131
|
428 lua_rawset(L, -3);
|
jbe@131
|
429 return 0;
|
jbe@131
|
430 }
|
jbe@131
|
431
|
jbe@130
|
432 static int json_len(lua_State *L) {
|
jbe@130
|
433 lua_settop(L, 1);
|
jbe@130
|
434 lua_pushvalue(L, 1);
|
jbe@130
|
435 lua_rawget(L, JSON_UPVAL_SHADOWTBL);
|
jbe@130
|
436 if (lua_isnil(L, -1)) lua_pop(L, 1);
|
jbe@130
|
437 lua_pushinteger(L, lua_rawlen(L, -1));
|
jbe@123
|
438 return 1;
|
jbe@123
|
439 }
|
jbe@123
|
440
|
jbe@130
|
441 static int json_index(lua_State *L) {
|
jbe@130
|
442 lua_settop(L, 2);
|
jbe@130
|
443 lua_pushvalue(L, 1);
|
jbe@130
|
444 lua_rawget(L, JSON_UPVAL_SHADOWTBL);
|
jbe@130
|
445 if (lua_isnil(L, -1)) return 1;
|
jbe@130
|
446 lua_pushvalue(L, 2);
|
jbe@130
|
447 lua_rawget(L, -2);
|
jbe@130
|
448 if (lua_rawequal(L, -1, JSON_UPVAL_NULLMARK)) lua_pushnil(L);
|
jbe@127
|
449 return 1;
|
jbe@127
|
450 }
|
jbe@127
|
451
|
jbe@130
|
452 static int json_newindex(lua_State *L) {
|
jbe@130
|
453 lua_settop(L, 3);
|
jbe@123
|
454 lua_pushvalue(L, 1);
|
jbe@130
|
455 lua_rawget(L, JSON_UPVAL_SHADOWTBL);
|
jbe@130
|
456 if (lua_isnil(L, -1)) return luaL_error(L, "Shadow table not found");
|
jbe@130
|
457 lua_replace(L, 1);
|
jbe@130
|
458 lua_rawset(L, 1);
|
jbe@121
|
459 return 1;
|
jbe@121
|
460 }
|
jbe@121
|
461
|
jbe@135
|
462 static int json_pairs_iterfunc(lua_State *L) {
|
jbe@135
|
463 lua_settop(L, 2);
|
jbe@135
|
464 lua_pushvalue(L, 1);
|
jbe@135
|
465 lua_rawget(L, JSON_UPVAL_SHADOWTBL);
|
jbe@135
|
466 if (lua_isnil(L, -1)) return luaL_error(L, "Shadow table not found");
|
jbe@135
|
467 lua_pushvalue(L, 2);
|
jbe@135
|
468 if (!lua_next(L, -2)) return 0;
|
jbe@135
|
469 if (lua_rawequal(L, -1, JSON_UPVAL_NULLMARK)) {
|
jbe@135
|
470 lua_pop(L, 1);
|
jbe@135
|
471 lua_pushnil(L);
|
jbe@135
|
472 }
|
jbe@135
|
473 return 2;
|
jbe@135
|
474 }
|
jbe@135
|
475
|
jbe@135
|
476 static int json_pairs(lua_State *L) {
|
jbe@135
|
477 lua_pushvalue(L, JSON_UPVAL_PAIRS_ITERFUNC);
|
jbe@135
|
478 lua_pushvalue(L, 1);
|
jbe@135
|
479 lua_pushnil(L);
|
jbe@135
|
480 return 3;
|
jbe@135
|
481 }
|
jbe@135
|
482
|
jbe@134
|
483 static int json_ipairs_iterfunc(lua_State *L) {
|
jbe@134
|
484 int idx;
|
jbe@134
|
485 lua_settop(L, 2);
|
jbe@134
|
486 idx = lua_tointeger(L, 2) + 1;
|
jbe@134
|
487 lua_pushvalue(L, 1);
|
jbe@134
|
488 lua_rawget(L, JSON_UPVAL_SHADOWTBL);
|
jbe@134
|
489 if (lua_isnil(L, -1)) return luaL_error(L, "Shadow table not found");
|
jbe@134
|
490 lua_rawgeti(L, -1, idx);
|
jbe@134
|
491 if (lua_isnil(L, -1)) return 0;
|
jbe@134
|
492 lua_pushinteger(L, idx);
|
jbe@134
|
493 if (lua_rawequal(L, -2, JSON_UPVAL_NULLMARK)) lua_pushnil(L);
|
jbe@134
|
494 else lua_pushvalue(L, -2);
|
jbe@134
|
495 return 2;
|
jbe@134
|
496 }
|
jbe@134
|
497
|
jbe@134
|
498 static int json_ipairs(lua_State *L) {
|
jbe@134
|
499 lua_pushvalue(L, JSON_UPVAL_IPAIRS_ITERFUNC);
|
jbe@134
|
500 lua_pushvalue(L, 1);
|
jbe@134
|
501 lua_pushinteger(L, 0);
|
jbe@134
|
502 return 3;
|
jbe@134
|
503 }
|
jbe@134
|
504
|
jbe@121
|
505 static const struct luaL_Reg json_module_functions[] = {
|
jbe@133
|
506 {"object", json_object},
|
jbe@133
|
507 {"array", json_array},
|
jbe@121
|
508 {"import", json_import},
|
jbe@130
|
509 {"get", json_get},
|
jbe@127
|
510 {"type", json_type},
|
jbe@123
|
511 {"isnull", json_isnull},
|
jbe@131
|
512 {"setnull", json_setnull},
|
jbe@121
|
513 {NULL, NULL}
|
jbe@121
|
514 };
|
jbe@121
|
515
|
jbe@126
|
516 static const struct luaL_Reg json_metatable_functions[] = {
|
jbe@130
|
517 {"__len", json_len},
|
jbe@130
|
518 {"__index", json_index},
|
jbe@130
|
519 {"__newindex", json_newindex},
|
jbe@135
|
520 {"__pairs", json_pairs},
|
jbe@134
|
521 {"__ipairs", json_ipairs},
|
jbe@126
|
522 {NULL, NULL}
|
jbe@126
|
523 };
|
jbe@126
|
524
|
jbe@121
|
525 int luaopen_json(lua_State *L) {
|
jbe@126
|
526 lua_settop(L, 0);
|
jbe@126
|
527 lua_newtable(L); // 1: library table on stack position
|
jbe@130
|
528 lua_newtable(L); // 2: table used as JSON NULL value in internal shadow tables
|
jbe@130
|
529 lua_newtable(L); // 3: ephemeron table to store shadow tables for each JSON object/array to allow NULL values returned as nil
|
jbe@130
|
530 lua_newtable(L); // 4: ephemeron table to store the type of the JSON object/array
|
jbe@130
|
531 lua_newtable(L); // 5: metatable for ephemeron tables
|
jbe@121
|
532 lua_pushliteral(L, "__mode");
|
jbe@121
|
533 lua_pushliteral(L, "k");
|
jbe@130
|
534 lua_rawset(L, 5);
|
jbe@130
|
535 lua_pushvalue(L, 5); // 6: cloned metatable reference
|
jbe@127
|
536 lua_setmetatable(L, 3);
|
jbe@130
|
537 lua_setmetatable(L, 4);
|
jbe@130
|
538 lua_newtable(L); // 5: metatable for JSON objects and JSON arrays
|
jbe@126
|
539 lua_pushvalue(L, 2);
|
jbe@126
|
540 lua_pushvalue(L, 3);
|
jbe@127
|
541 lua_pushvalue(L, 4);
|
jbe@130
|
542 lua_pushvalue(L, 5);
|
jbe@135
|
543 lua_pushcclosure(L, json_pairs_iterfunc, 4); // 6: iteration function for pairs
|
jbe@135
|
544 lua_pushvalue(L, 2);
|
jbe@135
|
545 lua_pushvalue(L, 3);
|
jbe@135
|
546 lua_pushvalue(L, 4);
|
jbe@135
|
547 lua_pushvalue(L, 5);
|
jbe@135
|
548 lua_pushcclosure(L, json_ipairs_iterfunc, 4); // 7: iteration function for ipairs
|
jbe@134
|
549 lua_pushvalue(L, 5);
|
jbe@134
|
550 lua_pushvalue(L, 2);
|
jbe@134
|
551 lua_pushvalue(L, 3);
|
jbe@134
|
552 lua_pushvalue(L, 4);
|
jbe@134
|
553 lua_pushvalue(L, 5);
|
jbe@134
|
554 lua_pushvalue(L, 6);
|
jbe@135
|
555 lua_pushvalue(L, 7);
|
jbe@135
|
556 luaL_setfuncs(L, json_metatable_functions, 6);
|
jbe@135
|
557 lua_setfield(L, 1, "metatable");
|
jbe@135
|
558 luaL_setfuncs(L, json_module_functions, 6);
|
jbe@121
|
559 return 1;
|
jbe@121
|
560 }
|