/
grammar.leg
298 lines (248 loc) · 12.6 KB
/
grammar.leg
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
%{
#include <stdlib.h>
#include "tr.h"
#include "internal.h"
/*#define YY_DEBUG 1*/
#define YYSTYPE OBJ
#define YYMALLOC TR_MALLOC
#define YYREALLOC TR_REALLOC
#define yyvm compiler->vm
static char *charbuf;
static OBJ sbuf;
static size_t nbuf;
static TrCompiler *compiler;
#define YY_INPUT(buf, result, max_size) { \
int yyc; \
if (charbuf && *charbuf != '\0') \
yyc= *charbuf++; \
else \
yyc= EOF; \
result= (EOF == yyc) ? 0 : (*(buf)= yyc, 1); \
}
#define STRING_START sbuf = TrString_new3(yyvm, 4096); nbuf = 0
#define STRING_PUSH(P,L) \
VM = yyvm; \
TR_MEMCPY_N(TR_STR_PTR(sbuf) + nbuf, (P), char, (L)); \
nbuf += (L)
%}
Root = s:Stmts EOF { compiler->node = NODE(ROOT, s) }
| .
{
VM = yyvm;
tr_raise("SyntaxError at line %d, while parsing: `%s'\n", compiler->line, yybuf)
}
Stmts = SEP*
- head:Stmt Comment? { head = NODES(head) }
( SEP - tail:Stmt Comment? { PUSH_NODE(head, tail) }
| SEP - Comment
)* SEP? { $$ = head }
| SEP+ { $$ = NODES_N(0) }
OptStmts = Stmts
| - SEP? { $$ = NODES_N(0) }
Stmt = While
| Until
| If
| Unless
| Def
| Class
| Module
| Expr
Expr = Assign
| AsgnCall
| UnaryOp
| BinOp
| SpecCall
| Call
| Range
| Yield
| Return
| Value
Comment = - '#' [^\n]* # HACK (!EOL)* cause a hang wth?
Call = { block = rcv = 0 }
( rcv:Value '.'
)? ( rmsg:Message '.' { rcv = NODE2(SEND, rcv, rmsg) }
)* msg:Message
- block:Block? { $$ = NODE3(SEND, rcv, msg, block) }
# TODO refactor head part w/ Call maybe eh?
AsgnCall = { rcv = 0 }
( rcv:Value '.'
)? ( rmsg:Message '.' { rcv = NODE2(SEND, rcv, rmsg) }
)* msg:ID - asg:ASSIGN
- val:Stmt { VM = yyvm; $$ = NODE2(SEND, rcv, NODE2(MSG, SYMCAT(msg, asg), NODES(NODE(ARG, val)))) }
Receiver = ( { rcv = 0 }
rcv:Call
| rcv:Value
) { $$ = rcv }
SpecCall = rcv:Receiver '[' args:Args ']'
- ASSIGN - val:Stmt { PUSH_NODE(args, NODE(ARG, val)); $$ = NODE2(SEND, rcv, NODE2(MSG, TrSymbol_new(yyvm, "[]="), args)) }
| rcv:Receiver '[' args:Args ']' { $$ = NODE2(SEND, rcv, NODE2(MSG, TrSymbol_new(yyvm, "[]"), args)) }
BinOp = ( rcv:SpecCall | rcv:Receiver )
-
(
'&&' - arg:Expr { $$ = NODE2(AND, rcv, arg) }
| '||' - arg:Expr { $$ = NODE2(OR, rcv, arg) }
| '+' - arg:Expr { $$ = NODE2(ADD, rcv, arg) }
| '-' - arg:Expr { $$ = NODE2(SUB, rcv, arg) }
| '<' - arg:Expr { $$ = NODE2(LT, rcv, arg) }
| op:BINOP - arg:Expr { $$ = NODE2(SEND, rcv, NODE2(MSG, op, NODES(NODE(ARG, arg)))) }
)
UnaryOp = '-' rcv:Expr { $$ = NODE(NEG, rcv) }
| '!' rcv:Expr { $$ = NODE(NOT, rcv) }
Message = name:ID { args = 0 }
( '(' args:Args? ')'
| SPACE args:Args
)? { $$ = NODE2(MSG, name, args) }
Args = - head:Expr - { head = NODES(NODE(ARG, head)) }
( ',' - tail:Expr - { PUSH_NODE(head, NODE(ARG, tail)) }
)* ( ',' - '*' splat:Expr - { PUSH_NODE(head, NODE2(ARG, splat, 1)) }
)? { $$ = head }
| - '*' splat:Expr - { $$ = NODES(NODE2(ARG, splat, 1)) }
Block = 'do' SEP
- body:OptStmts -
'end' { $$ = NODE(BLOCK, body) }
| 'do' - '|' params:Params '|' SEP
- body:OptStmts -
'end' { $$ = NODE2(BLOCK, body, params) }
# FIXME this might hang the parser and is very slow.
# Clash with Hash for sure.
#| '{' - body:OptStmts - '}' { $$ = NODE(BLOCK, body) }
#| '{' - '|' params:Params '|'
# - body:OptStmts - '}' { $$ = NODE2(BLOCK, body, params) }
Assign = name:ID - ASSIGN - val:Stmt { $$ = NODE2(ASSIGN, name, val) }
| name:CONST - ASSIGN - val:Stmt { $$ = NODE2(SETCONST, name, val) }
| name:IVAR - ASSIGN - val:Stmt { $$ = NODE2(SETIVAR, name, val) }
| name:CVAR - ASSIGN - val:Stmt { $$ = NODE2(SETCVAR, name, val) }
| name:GLOBAL - ASSIGN - val:Stmt { $$ = NODE2(SETGLOBAL, name, val) }
While = 'while' SPACE cond:Expr SEP
body:Stmts -
'end' { $$ = NODE2(WHILE, cond, body) }
Until = 'until' SPACE cond:Expr SEP
body:Stmts -
'end' { $$ = NODE2(UNTIL, cond, body) }
If = 'if' SPACE cond:Expr SEP { else_body = 0 }
body:Stmts -
else_body:Else?
'end' { $$ = NODE3(IF, cond, body, else_body) }
| body:Expr - 'if' - cond:Expr { $$ = NODE2(IF, cond, NODES(body)) }
Unless = 'unless' SPACE cond:Expr SEP { else_body = 0 }
body:Stmts -
else_body:Else?
'end' { $$ = NODE3(UNLESS, cond, body, else_body) }
| body:Expr -
'unless' - cond:Expr { $$ = NODE2(UNLESS, cond, NODES(body)) }
Else = 'else' SEP - body:Stmts - { $$ = body }
Method = rcv:ID '.' name:METHOD { $$ = NODE2(METHOD, NODE2(SEND, 0, NODE(MSG, rcv)), name) }
| rcv:Value '.' name:METHOD { $$ = NODE2(METHOD, rcv, name) }
| name:METHOD { $$ = NODE2(METHOD, 0, name) }
Def = 'def' SPACE method:Method { params = 0 }
(- '(' params:Params? ')')? SEP
body:OptStmts -
'end' { $$ = NODE3(DEF, method, params ? params : NODES_N(0), body) }
Params = head:Param { head = NODES(head) }
( ',' tail:Param { PUSH_NODE(head, tail) }
)* { $$ = head }
Param = - name:ID - '=' - def:Expr { $$ = NODE3(PARAM, name, 0, def) }
| - name:ID - { $$ = NODE(PARAM, name) }
| - '*' name:ID - { $$ = NODE2(PARAM, name, 1) }
Class = 'class' SPACE name:CONST { super = 0 }
(- '<' - super:CONST)? SEP
body:OptStmts -
'end' { $$ = NODE3(CLASS, name, super, body) }
Module = 'module' SPACE name:CONST SEP
body:OptStmts -
'end' { $$ = NODE3(MODULE, name, 0, body) }
Range = s:Receiver - '..' - e:Expr { $$ = NODE3(RANGE, s, e, 0) }
| s:Receiver - '...' - e:Expr { $$ = NODE3(RANGE, s, e, 1) }
Yield = 'yield' SPACE args:AryItems { $$ = NODE(YIELD, args) }
| 'yield' '(' args:AryItems ')' { $$ = NODE(YIELD, args) }
| 'yield' { $$ = NODE(YIELD, NODES_N(0)) }
Return = 'return' SPACE arg:Expr - !',' { $$ = NODE(RETURN, arg) }
| 'return' '(' arg:Expr ')' - !','{ $$ = NODE(RETURN, arg) }
| 'return' SPACE args:AryItems { $$ = NODE(RETURN, NODE(ARRAY, args)) }
| 'return' '(' args:AryItems ')' { $$ = NODE(RETURN, NODE(ARRAY, args)) }
| 'return' { $$ = NODE(RETURN, 0) }
Value = v:NUMBER { $$ = NODE(VALUE, v) }
| v:SYMBOL { $$ = NODE(VALUE, v) }
| v:STRING1 { $$ = NODE(STRING, v) }
| v:STRING2 { $$ = NODE(STRING, v) }
| v:CONST { $$ = NODE(CONST, v) }
| 'nil' { $$ = NODE(NIL, 0) }
| 'true' { $$ = NODE(BOOL, TR_TRUE) }
| 'false' { $$ = NODE(BOOL, TR_FALSE) }
| 'self' { $$ = NODE(SELF, 0) }
| name:IVAR { $$ = NODE(GETIVAR, name) }
| name:CVAR { $$ = NODE(GETCVAR, name) }
| name:GLOBAL { $$ = NODE(GETGLOBAL, name) } # TODO
| '[' - ']' { $$ = NODE(ARRAY, NODES_N(0)) }
| '[' - items:AryItems - ']' { $$ = NODE(ARRAY, items) }
| '{' - '}' { $$ = NODE(HASH, NODES_N(0)) }
| '{' - items:HashItems - '}' { $$ = NODE(HASH, items) }
| '(' - Expr - ')'
AryItems = - head:Expr - { head = NODES(head) }
( ',' - tail:Expr - { PUSH_NODE(head, tail) }
)* { $$ = head }
HashItems = head:Expr - '=>' - val:Expr { head = NODES_N(2, head, val) }
( - ',' - key:Expr - { PUSH_NODE(head, key) }
'=>' - val:Expr { PUSH_NODE(head, val) }
)* { $$ = head }
KEYWORD = 'while' | 'until' | 'do' | 'end' |
'if' | 'unless' | 'else' |
'true' | 'false' | 'nil' | 'self' |
'class' | 'module' | 'def' |
'yield' | 'return'
NAME = [a-zA-Z0-9_]+
ID = !'self' # self is special, can never be a method name
< KEYWORD > &('.' | '(' | '[') { $$ = TrSymbol_new(yyvm, yytext) } # hm, there's probably a better way
| < KEYWORD NAME > { $$ = TrSymbol_new(yyvm, yytext) }
| !KEYWORD
< [a-z_] NAME?
( '=' &'(' | '!'| '?' )? > { $$ = TrSymbol_new(yyvm, yytext) }
CONST = < [A-Z] NAME? > { $$ = TrSymbol_new(yyvm, yytext) }
BINOP = < ( '**' | '^' | '&' | '|' | '~' |
'+' | '-' | '*' | '/' | '%' | '<=>' |
'<<' | '>>' | '==' | '=~' | '!=' | '===' |
'<' | '>' | '<=' | '>='
) > { $$ = TrSymbol_new(yyvm, yytext) }
UNOP = < ( '-@' | '!' ) > { $$ = TrSymbol_new(yyvm, yytext) }
METHOD = ID | UNOP | BINOP
ASSIGN = < '=' > &(!'=') { $$ = TrSymbol_new(yyvm, yytext) }
IVAR = < '@' NAME > { $$ = TrSymbol_new(yyvm, yytext) }
CVAR = < '@@' NAME > { $$ = TrSymbol_new(yyvm, yytext) }
GLOBAL = < '$' NAME > { $$ = TrSymbol_new(yyvm, yytext) }
NUMBER = < [0-9]+ > { $$ = TR_INT2FIX(atoi(yytext)) }
SYMBOL = ':' < (NAME | KEYWORD) > { $$ = TrSymbol_new(yyvm, yytext) }
STRING1 = '\'' { STRING_START }
(
'\\\'' { STRING_PUSH("'", 1) }
| < [^\'] > { STRING_PUSH(yytext, yyleng) }
)* '\'' { $$ = sbuf }
STRING2 = '"' { STRING_START }
(
'\\n' { STRING_PUSH("\n", 1) }
| '\\b' { STRING_PUSH("\b", 1) }
| '\\f' { STRING_PUSH("\f", 1) }
| '\\r' { STRING_PUSH("\r", 1) }
| '\\t' { STRING_PUSH("\t", 1) }
| '\\\"' { STRING_PUSH("\"", 1) }
| '\\\\' { STRING_PUSH("\\", 1) }
| < [^\"] > { STRING_PUSH(yytext, yyleng) }
)* '"' { $$ = sbuf }
- = [ \t]*
SPACE = [ ]+
EOL = ( '\n' | '\r\n' | '\r' ) { compiler->line++ }
EOF = !.
SEP = ( - Comment? (EOL | ';') )+
%%
TrBlock *TrBlock_compile(VM, char *code, char *fn, size_t lineno) {
assert(!compiler && "parser not reentrant");
charbuf = code;
compiler = TrCompiler_new(vm, fn);
compiler->line += lineno;
compiler->filename = TrString_new2(vm, fn);
while (yyparse());
TrCompiler_compile(compiler);
TrBlock *b = compiler->block;
charbuf = 0;
compiler = 0;
return b;
}