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
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
|
#..
This File contains actions for making actions and compile-time actions and some helper
functions to make that easier.
# Compile-time action to make compile-time actions:
immediately
lua> ".."
nomsu:define_compile_action("compile %actions to %lua", function(tree, \%actions, \%lua)
local lua = Lua(tree.source, "nomsu:define_compile_action(");
local stubs = {};
for i, action in ipairs(\%actions.value) do
stubs[i] = action:get_stub(true);
end
stubs = repr(stubs);
if #stubs > 80 then
lua:append("\n ",stubs,",\n ");
else
lua:append(stubs,", ");
end
lua:append("function(tree");
local args = {};
for i,tok in ipairs(\%actions.value[1].value) do
if tok.type == "Var" then args[#args+1] = nomsu:var_to_lua_identifier(tok.value); end
end
for i, arg in ipairs(args) do
lua:append(", ");
lua:append(arg);
end
local body_lua = \%lua:as_lua(nomsu);
body_lua:convert_to_statements("return ");
body_lua:remove_free_vars(args);
body_lua:declare_locals();
lua:append(")\n ", body_lua, "\nend);");
return lua;
end);
# Compile-time action to make actions
immediately
compile [action %actions %body] to
lua> ".."
local lua = Lua(tree.source, "nomsu:define_action(");
local stubs = {};
for i, action in ipairs(\%actions.value) do
stubs[i] = action:get_stub(true);
end
stubs = repr(stubs);
if #stubs > 80 then
lua:append("\n ",stubs,",\n ");
else
lua:append(stubs,", ");
end
lua:append("function(");
local args = {};
for i,tok in ipairs(\%actions.value[1].value) do
if tok.type == "Var" then args[#args+1] = nomsu:var_to_lua_identifier(tok.value); end
end
for i, arg in ipairs(args) do
lua:append(arg);
if i < #args then lua:append(", ") end
end
local body_lua = \%body:as_lua(nomsu);
body_lua:convert_to_statements("return ");
body_lua:remove_free_vars(args);
body_lua:declare_locals();
lua:append(")\n ", body_lua, "\nend);")
return lua;
# Macro to make nomsu macros
immediately
compile [parse %shorthand as %longhand] to
lua> ".."
local lua = Lua(tree.source, "nomsu:define_compile_action(");
local stubs = {};
for i, action in ipairs(\%shorthand.value) do
stubs[i] = action:get_stub(true);
end
stubs = repr(stubs);
if #stubs > 80 then
lua:append("\n ",stubs,",\n ");
else
lua:append(stubs,", ");
end
lua:append("function(tree");
local args = {};
for i,tok in ipairs(\%shorthand.value[1].value) do
if tok.type == "Var" then args[#args+1] = nomsu:var_to_lua_identifier(tok.value); end
end
for i, arg in ipairs(args) do
lua:append(", ");
lua:append(arg);
end
local template = repr(tostring(\%longhand:as_nomsu()));
local replacements = {};
for i, a in ipairs(args) do replacements[i] = a.."="..a; end
replacements = "{"..table.concat(replacements, ", ").."}";
lua:append([[)
local template = nomsu:parse(Nomsu(]]..repr(tree.source)..[[, ]]..template..[[));
local replacement = nomsu:tree_with_replaced_vars(template, ]]..replacements..[[);
return replacement:as_lua(nomsu);
end);]]);
return lua;
action [remove action %stub]
lua> ".."
local fn = ACTIONS[\%stub];
local stubs = ARG_ORDERS[fn];
for stub in pairs(stubs) do
ACTIONS[stub] = nil;
end
ARG_ORDERS[fn] = nil;
immediately
action [%tree as lua]
=lua "\%tree:as_lua(nomsu)"
action [%tree as lua expr]
lua> ".."
local lua = \%tree:as_lua(nomsu);
if not lua.is_value then
error("Invalid thing to convert to lua expr: "..\%tree.source:get_text());
end
return lua;
action [%tree as lua statements]
lua> ".."
local lua = \%tree:as_lua(nomsu);
lua:convert_to_statements();
return lua;
action [%tree with vars %vars]
=lua "nomsu:tree_with_replaced_vars(\%tree, \%vars)"
compile [declare locals in %code] to
Lua value "\(%code as lua expr):declare_locals()"
compile [declare locals %locals in %code] to
Lua value "\(%code as lua expr):declare_locals(\(%locals as lua expr))"
compile [remove free vars %vars from %code] to
Lua "\(%code as lua expr):remove_free_vars(\(%vars as lua expr));"
action [%tree as value]
=lua "nomsu:tree_to_value(\%tree)"
action [%tree's stub]
=lua "\%tree:get_stub()"
immediately
parse [%var <-write %code] as: lua> "\%var:append(\%code);"
parse [to %var write %code] as: lua> "\%var:append(\%code);"
immediately
action [%tree's source code, %tree' source code]
=lua "\%tree.source:get_text()"
compile [repr %obj] to: Lua value "repr(\(%obj as lua expr))"
compile [%obj as text] to: Lua value "tostring(\(%obj as lua expr))"
compile [type of %obj] to: Lua value "type(\(%obj as lua expr))"
immediately
compile [nomsu] to: Lua value "nomsu"
compile [%var as lua identifier] to: Lua value "nomsu:var_to_lua_identifier(\(%var as lua expr))"
# Compiler tools
immediately
compile [run %code] to
Lua value "nomsu:run(Nomsu(\(=lua "tostring(tree.source)"), \(%code as lua expr)))"
parse [enable debugging] as: lua> "nomsu.debug = true;"
parse [disable debugging] as: lua> "nomsu.debug = false;"
immediately
compile [show lua %block] to
lua> ".."
local \%lua = \%block:as_lua(nomsu);
return Lua(\%block.source, "print(", repr(tostring(\%lua)), ");");
immediately
compile [say %message] to
lua> ".."
if \%message.type == "Text" then
return Lua(tree.source, "print(", \(%message as lua expr), ");");
else
return Lua(tree.source, "print(stringify(", \(%message as lua expr), "));");
end
immediately
compile [source] to: Lua value (=lua "tree.source") "tree.source"
#..
immediately
action [Lua %]: Lua (=lua "tree.source") %
action [Lua value %]: Lua value (=lua "tree.source") %
# Return
immediately
#.. Return statement is wrapped in a do..end block because Lua is unhappy if you
put code after a return statement, unless you wrap it in a block.
compile [return] to: Lua "do return; end"
compile [return %return_value] to: Lua "do return \(%return_value as lua expr); end"
# Error functions
immediately
compile [barf] to: Lua "error(nil, 0);"
compile [barf %msg] to: Lua "error(\(%msg as lua expr), 0);"
compile [assume %condition] to
lua> "local \%assumption = 'Assumption failed: '..tostring(\%condition.source:get_text());"
return
Lua ".."
if not \(%condition as lua expr) then
error(\(repr %assumption), 0);
end
# TODO: factor this out and replace with "unless %condition: barf %message"
compile [assume %condition or barf %message] to
Lua ".."
if not \(%condition as lua expr) then
error(\(%message as lua expr), 0);
end
# Literals
immediately
compile [yes] to: Lua value "true"
compile [no] to: Lua value "false"
compile [nothing, nil, null] to: Lua value "nil"
|
