1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
|
// slang-fiddle-script.cpp
#include "slang-fiddle-script.h"
#include "lua/lapi.h"
#include "lua/lauxlib.h"
#include "lua/lualib.h"
namespace fiddle
{
DiagnosticSink* _sink = nullptr;
StringBuilder* _builder = nullptr;
Count _templateCounter = 0;
void diagnoseLuaError(lua_State* L)
{
size_t size = 0;
char const* buffer = lua_tolstring(L, -1, &size);
String message = UnownedStringSlice(buffer, size);
message = message + "\n";
if (_sink)
{
_sink->diagnoseRaw(Severity::Error, message.getBuffer());
}
else
{
fprintf(stderr, "%s", message.getBuffer());
}
}
int _handleLuaError(lua_State* L)
{
diagnoseLuaError(L);
return lua_error(L);
}
int _original(lua_State* L)
{
// We ignore the text that we want to just pass
// through unmodified...
return 0;
}
int _raw(lua_State* L)
{
size_t size = 0;
char const* buffer = lua_tolstring(L, 1, &size);
_builder->append(UnownedStringSlice(buffer, size));
return 0;
}
int _splice(lua_State* L)
{
auto savedBuilder = _builder;
StringBuilder spliceBuilder;
_builder = &spliceBuilder;
lua_pushvalue(L, 1);
auto result = lua_pcall(L, 0, 1, 0);
_builder = savedBuilder;
if (result != LUA_OK)
{
return _handleLuaError(L);
}
// The actual string value follows whatever
// got printed to the output (unless it is
// nil).
//
_builder->append(spliceBuilder.produceString());
if (!lua_isnil(L, -1))
{
size_t size = 0;
char const* buffer = luaL_tolstring(L, -1, &size);
_builder->append(UnownedStringSlice(buffer, size));
}
return 0;
}
int _template(lua_State* L)
{
auto templateID = _templateCounter++;
_builder->append("\n#if FIDDLE_GENERATED_OUTPUT_ID == ");
_builder->append(templateID);
_builder->append("\n");
lua_pushvalue(L, 1);
auto result = lua_pcall(L, 0, 0, 0);
if (result != LUA_OK)
{
return _handleLuaError(L);
}
_builder->append("\n#endif\n");
return 0;
}
lua_State* L = nullptr;
void ensureLuaInitialized()
{
if (L)
return;
L = luaL_newstate();
luaL_openlibs(L);
lua_pushcclosure(L, &_original, 0);
lua_setglobal(L, "ORIGINAL");
lua_pushcclosure(L, &_raw, 0);
lua_setglobal(L, "RAW");
lua_pushcclosure(L, &_splice, 0);
lua_setglobal(L, "SPLICE");
lua_pushcclosure(L, &_template, 0);
lua_setglobal(L, "TEMPLATE");
// TODO: register custom stuff here...
}
lua_State* getLuaState()
{
ensureLuaInitialized();
return L;
}
String evaluateScriptCode(String originalFileName, String scriptSource, DiagnosticSink* sink)
{
StringBuilder builder;
_builder = &builder;
_templateCounter = 0;
ensureLuaInitialized();
String luaChunkName = "@" + originalFileName;
if (LUA_OK != luaL_loadbuffer(
L,
scriptSource.getBuffer(),
scriptSource.getLength(),
luaChunkName.getBuffer()))
{
size_t size = 0;
char const* buffer = lua_tolstring(L, -1, &size);
String message = UnownedStringSlice(buffer, size);
message = message + "\n";
sink->diagnoseRaw(Severity::Error, message.getBuffer());
SLANG_ABORT_COMPILATION("fiddle failed during Lua script loading");
}
if (LUA_OK != lua_pcall(L, 0, 0, 0))
{
size_t size = 0;
char const* buffer = lua_tolstring(L, -1, &size);
String message = UnownedStringSlice(buffer, size);
message = message + "\n";
sink->diagnoseRaw(Severity::Error, message.getBuffer());
SLANG_ABORT_COMPILATION("fiddle failed during Lua script execution");
}
_builder = nullptr;
return builder.produceString();
}
} // namespace fiddle
|
