-
Notifications
You must be signed in to change notification settings - Fork 190
/
parse.moon
361 lines (271 loc) · 11.6 KB
/
parse.moon
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
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
debug_grammar = false
lpeg = require "lpeg"
lpeg.setmaxstack 10000 -- whoa
err_msg = "Failed to parse:%s\n [%d] >> %s"
import Stack from require "moonscript.data"
import trim, pos_to_line, get_line from require "moonscript.util"
import unpack from require "moonscript.util"
import wrap_env from require "moonscript.parse.env"
{
:R, :S, :V, :P, :C, :Ct, :Cmt, :Cg, :Cb, :Cc
} = lpeg
{
:White, :Break, :Stop, :Comment, :Space, :SomeSpace, :SpaceBreak, :EmptyLine,
:AlphaNum, :Num, :Shebang, :L
Name: _Name
} = require "moonscript.parse.literals"
SpaceName = Space * _Name
Num = Space * (Num / (v) -> {"number", v})
{
:Indent, :Cut, :ensure, :extract_line, :mark, :pos, :flatten_or_mark,
:is_assignable, :check_assignable, :format_assign, :format_single_assign,
:sym, :symx, :simple_string, :wrap_func_arg, :join_chain,
:wrap_decorator, :check_lua_string, :self_assign, :got
} = require "moonscript.parse.util"
build_grammar = wrap_env debug_grammar, (root) ->
_indent = Stack 0
_do_stack = Stack 0
state = {
-- last pos we saw, used to report error location
last_pos: 0
}
check_indent = (str, pos, indent) ->
state.last_pos = pos
_indent\top! == indent
advance_indent = (str, pos, indent) ->
top = _indent\top!
if top != -1 and indent > top
_indent\push indent
true
push_indent = (str, pos, indent) ->
_indent\push indent
true
pop_indent = ->
assert _indent\pop!, "unexpected outdent"
true
check_do = (str, pos, do_node) ->
top = _do_stack\top!
if top == nil or top
return true, do_node
false
disable_do = ->
_do_stack\push false
true
pop_do = ->
assert _do_stack\pop! != nil, "unexpected do pop"
true
DisableDo = Cmt "", disable_do
PopDo = Cmt "", pop_do
keywords = {}
key = (chars) ->
keywords[chars] = true
Space * chars * -AlphaNum
op = (chars) ->
patt = Space * C chars
-- it's a word, treat like keyword
if chars\match "^%w*$"
keywords[chars] = true
patt *= -AlphaNum
patt
Name = Cmt(SpaceName, (str, pos, name) ->
return false if keywords[name]
true
) / trim
SelfName = Space * "@" * (
"@" * (_Name / mark"self_class" + Cc"self.__class") +
_Name / mark"self" +
Cc"self" -- @ by itself
)
KeyName = SelfName + Space * _Name / mark"key_literal"
VarArg = Space * P"..." / trim
g = P {
root or File
File: Shebang^-1 * (Block + Ct"")
Block: Ct(Line * (Break^1 * Line)^0)
CheckIndent: Cmt(Indent, check_indent), -- validates line is in correct indent
Line: (CheckIndent * Statement + Space * L(Stop))
Statement: pos(
Import + While + With + For + ForEach + Switch + Return +
Local + Export + BreakLoop +
Ct(ExpList) * (Update + Assign)^-1 / format_assign
) * Space * ((
-- statement decorators
key"if" * Exp * (key"else" * Exp)^-1 * Space / mark"if" +
key"unless" * Exp / mark"unless" +
CompInner / mark"comprehension"
) * Space)^-1 / wrap_decorator
Body: Space^-1 * Break * EmptyLine^0 * InBlock + Ct(Statement) -- either a statement, or an indented block
Advance: L Cmt(Indent, advance_indent) -- Advances the indent, gives back whitespace for CheckIndent
PushIndent: Cmt(Indent, push_indent)
PreventIndent: Cmt(Cc(-1), push_indent)
PopIndent: Cmt("", pop_indent)
InBlock: Advance * Block * PopIndent
Local: key"local" * ((op"*" + op"^") / mark"declare_glob" + Ct(NameList) / mark"declare_with_shadows")
Import: key"import" * Ct(ImportNameList) * SpaceBreak^0 * key"from" * Exp / mark"import"
ImportName: (sym"\\" * Ct(Cc"colon" * Name) + Name)
ImportNameList: SpaceBreak^0 * ImportName * ((SpaceBreak^1 + sym"," * SpaceBreak^0) * ImportName)^0
BreakLoop: Ct(key"break"/trim) + Ct(key"continue"/trim)
Return: key"return" * (ExpListLow/mark"explist" + C"") / mark"return"
WithExp: Ct(ExpList) * Assign^-1 / format_assign
With: key"with" * DisableDo * ensure(WithExp, PopDo) * key"do"^-1 * Body / mark"with"
Switch: key"switch" * DisableDo * ensure(Exp, PopDo) * key"do"^-1 * Space^-1 * Break * SwitchBlock / mark"switch"
SwitchBlock: EmptyLine^0 * Advance * Ct(SwitchCase * (Break^1 * SwitchCase)^0 * (Break^1 * SwitchElse)^-1) * PopIndent
SwitchCase: key"when" * Ct(ExpList) * key"then"^-1 * Body / mark"case"
SwitchElse: key"else" * Body / mark"else"
IfCond: Exp * Assign^-1 / format_single_assign
IfElse: (Break * EmptyLine^0 * CheckIndent)^-1 * key"else" * Body / mark"else"
IfElseIf: (Break * EmptyLine^0 * CheckIndent)^-1 * key"elseif" * pos(IfCond) * key"then"^-1 * Body / mark"elseif"
If: key"if" * IfCond * key"then"^-1 * Body * IfElseIf^0 * IfElse^-1 / mark"if"
Unless: key"unless" * IfCond * key"then"^-1 * Body * IfElseIf^0 * IfElse^-1 / mark"unless"
While: key"while" * DisableDo * ensure(Exp, PopDo) * key"do"^-1 * Body / mark"while"
For: key"for" * DisableDo * ensure(Name * sym"=" * Ct(Exp * sym"," * Exp * (sym"," * Exp)^-1), PopDo) *
key"do"^-1 * Body / mark"for"
ForEach: key"for" * Ct(AssignableNameList) * key"in" * DisableDo * ensure(Ct(sym"*" * Exp / mark"unpack" + ExpList), PopDo) * key"do"^-1 * Body / mark"foreach"
Do: key"do" * Body / mark"do"
Comprehension: sym"[" * Exp * CompInner * sym"]" / mark"comprehension"
TblComprehension: sym"{" * Ct(Exp * (sym"," * Exp)^-1) * CompInner * sym"}" / mark"tblcomprehension"
CompInner: Ct((CompForEach + CompFor) * CompClause^0)
CompForEach: key"for" * Ct(AssignableNameList) * key"in" * (sym"*" * Exp / mark"unpack" + Exp) / mark"foreach"
CompFor: key "for" * Name * sym"=" * Ct(Exp * sym"," * Exp * (sym"," * Exp)^-1) / mark"for"
CompClause: CompFor + CompForEach + key"when" * Exp / mark"when"
Assign: sym"=" * (Ct(With + If + Switch) + Ct(TableBlock + ExpListLow)) / mark"assign"
Update: ((sym"..=" + sym"+=" + sym"-=" + sym"*=" + sym"/=" + sym"%=" + sym"or=" + sym"and=" + sym"&=" + sym"|=" + sym">>=" + sym"<<=") / trim) * Exp / mark"update"
CharOperators: Space * C(S"+-*/%^><|&")
WordOperators: op"or" + op"and" + op"<=" + op">=" + op"~=" + op"!=" + op"==" + op".." + op"<<" + op">>" + op"//"
BinaryOperator: (WordOperators + CharOperators) * SpaceBreak^0
Assignable: Cmt(Chain, check_assignable) + Name + SelfName
Exp: Ct(Value * (BinaryOperator * Value)^0) / flatten_or_mark"exp"
SimpleValue:
If + Unless +
Switch +
With +
ClassDecl +
ForEach + For + While +
Cmt(Do, check_do) +
sym"-" * -SomeSpace * Exp / mark"minus" +
sym"#" * Exp / mark"length" +
sym"~" * Exp / mark"bitnot" +
key"not" * Exp / mark"not" +
TblComprehension +
TableLit +
Comprehension +
FunLit +
Num
-- a function call or an object access
ChainValue: (Chain + Callable) * Ct(InvokeArgs^-1) / join_chain
Value: pos(
SimpleValue +
Ct(KeyValueList) / mark"table" +
ChainValue +
String)
SliceValue: Exp
String: Space * DoubleString + Space * SingleString + LuaString
SingleString: simple_string("'")
DoubleString: simple_string('"', true)
LuaString: Cg(LuaStringOpen, "string_open") * Cb"string_open" * Break^-1 *
C((1 - Cmt(C(LuaStringClose) * Cb"string_open", check_lua_string))^0) *
LuaStringClose / mark"string"
LuaStringOpen: sym"[" * P"="^0 * "[" / trim
LuaStringClose: "]" * P"="^0 * "]"
Callable: pos(Name / mark"ref") + SelfName + VarArg + Parens / mark"parens"
Parens: sym"(" * SpaceBreak^0 * Exp * SpaceBreak^0 * sym")"
FnArgs: symx"(" * SpaceBreak^0 * Ct(FnArgsExpList^-1) * SpaceBreak^0 * sym")" + sym"!" * -P"=" * Ct""
FnArgsExpList: Exp * ((Break + sym",") * White * Exp)^0
Chain: (Callable + String + -S".\\") * ChainItems / mark"chain" +
Space * (DotChainItem * ChainItems^-1 + ColonChain) / mark"chain"
ChainItems: ChainItem^1 * ColonChain^-1 + ColonChain
ChainItem:
Invoke +
DotChainItem +
Slice +
symx"[" * Exp/mark"index" * sym"]"
DotChainItem: symx"." * _Name/mark"dot"
ColonChainItem: symx"\\" * _Name / mark"colon"
ColonChain: ColonChainItem * (Invoke * ChainItems^-1)^-1
Slice: symx"[" * (SliceValue + Cc(1)) * sym"," * (SliceValue + Cc"") *
(sym"," * SliceValue)^-1 *sym"]" / mark"slice"
Invoke: FnArgs / mark"call" +
SingleString / wrap_func_arg +
DoubleString / wrap_func_arg +
L(P"[") * LuaString / wrap_func_arg
TableValue: KeyValue + Ct(Exp)
TableLit: sym"{" * Ct(
TableValueList^-1 * sym","^-1 *
(SpaceBreak * TableLitLine * (sym","^-1 * SpaceBreak * TableLitLine)^0 * sym","^-1)^-1
) * White * sym"}" / mark"table"
TableValueList: TableValue * (sym"," * TableValue)^0
TableLitLine: PushIndent * ((TableValueList * PopIndent) + (PopIndent * Cut)) + Space
-- the unbounded table
TableBlockInner: Ct(KeyValueLine * (SpaceBreak^1 * KeyValueLine)^0)
TableBlock: SpaceBreak^1 * Advance * ensure(TableBlockInner, PopIndent) / mark"table"
ClassDecl: key"class" * -P":" * (Assignable + Cc(nil)) * (key"extends" * PreventIndent * ensure(Exp, PopIndent) + C"")^-1 * (ClassBlock + Ct("")) / mark"class"
ClassBlock: SpaceBreak^1 * Advance *
Ct(ClassLine * (SpaceBreak^1 * ClassLine)^0) * PopIndent
ClassLine: CheckIndent * ((
KeyValueList / mark"props" +
Statement / mark"stm" +
Exp / mark"stm"
) * sym","^-1)
Export: key"export" * (
Cc"class" * ClassDecl +
op"*" + op"^" +
Ct(NameList) * (sym"=" * Ct(ExpListLow))^-1) / mark"export"
KeyValue: (sym":" * -SomeSpace * Name * lpeg.Cp!) / self_assign +
Ct(
(KeyName + sym"[" * Exp * sym"]" +Space * DoubleString + Space * SingleString) *
symx":" *
(Exp + TableBlock + SpaceBreak^1 * Exp)
)
KeyValueList: KeyValue * (sym"," * KeyValue)^0
KeyValueLine: CheckIndent * KeyValueList * sym","^-1
FnArgsDef: sym"(" * White * Ct(FnArgDefList^-1) *
(key"using" * Ct(NameList + Space * "nil") + Ct"") *
White * sym")" + Ct"" * Ct""
FnArgDefList: FnArgDef * ((sym"," + Break) * White * FnArgDef)^0 * ((sym"," + Break) * White * Ct(VarArg))^0 + Ct(VarArg)
FnArgDef: Ct((Name + SelfName) * (sym"=" * Exp)^-1)
FunLit: FnArgsDef *
(sym"->" * Cc"slim" + sym"=>" * Cc"fat") *
(Body + Ct"") / mark"fndef"
NameList: Name * (sym"," * Name)^0
NameOrDestructure: Name + TableLit
AssignableNameList: NameOrDestructure * (sym"," * NameOrDestructure)^0
ExpList: Exp * (sym"," * Exp)^0
ExpListLow: Exp * ((sym"," + sym";") * Exp)^0
-- open args
InvokeArgs: -P"-" * (ExpList * (sym"," * (TableBlock + SpaceBreak * Advance * ArgBlock * TableBlock^-1) + TableBlock)^-1 + TableBlock)
ArgBlock: ArgLine * (sym"," * SpaceBreak * ArgLine)^0 * PopIndent
ArgLine: CheckIndent * ExpList
}
g, state
file_parser = ->
g, state = build_grammar!
file_grammar = White * g * White * -1
{
match: (str) =>
local tree
_, err = xpcall (->
tree = file_grammar\match str
), (err) ->
debug.traceback err, 2
-- regular error, let it bubble up
if type(err) == "string"
return nil, err
unless tree
local msg
err_pos = state.last_pos
if err
node, msg = unpack err
msg = " " .. msg if msg
err_pos = node[-1]
line_no = pos_to_line str, err_pos
line_str = get_line(str, line_no) or ""
return nil, err_msg\format msg or "", line_no, trim line_str
tree
}
{
:extract_line
:build_grammar
-- parse a string as a file
-- returns tree, or nil and error message
string: (str) -> file_parser!\match str
}