blob: 82c3500202b04c933f5adced4e11616c27c86a18 (
plain)
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
|
%option reentrant bison-bridge bison-locations
%option noyywrap
%option never-interactive
%x STRING
%x IND_STRING
%{
#include "aterm.hh"
#include "nixexpr.hh"
#include "nixexpr-ast.hh"
#define BISON_HEADER_HACK
#include "parser-tab.hh"
using namespace nix;
namespace nix {
static void initLoc(YYLTYPE * loc)
{
loc->first_line = 1;
loc->first_column = 1;
}
static void adjustLoc(YYLTYPE * loc, const char * s, size_t len)
{
while (len--) {
switch (*s++) {
case '\r':
if (*s == '\n') /* cr/lf */
s++;
/* fall through */
case '\n':
++loc->first_line;
loc->first_column = 1;
break;
default:
++loc->first_column;
}
}
}
static Expr unescapeStr(const char * s)
{
string t;
char c;
while ((c = *s++)) {
if (c == '\\') {
assert(*s);
c = *s++;
if (c == 'n') t += '\n';
else if (c == 'r') t += '\r';
else if (c == 't') t += '\t';
else t += c;
}
else if (c == '\r') {
/* Normalise CR and CR/LF into LF. */
t += '\n';
if (*s == '\n') s++; /* cr/lf */
}
else t += c;
}
return makeStr(toATerm(t), ATempty);
}
}
#define YY_USER_INIT initLoc(yylloc)
#define YY_USER_ACTION adjustLoc(yylloc, yytext, yyleng);
%}
ID [a-zA-Z\_][a-zA-Z0-9\_\']*
INT [0-9]+
PATH [a-zA-Z0-9\.\_\-\+]*(\/[a-zA-Z0-9\.\_\-\+]+)+
URI [a-zA-Z][a-zA-Z0-9\+\-\.]*\:[a-zA-Z0-9\%\/\?\:\@\&\=\+\$\,\-\_\.\!\~\*\']+
%%
if { return IF; }
then { return THEN; }
else { return ELSE; }
assert { return ASSERT; }
with { return WITH; }
let { return LET; }
in { return IN; }
rec { return REC; }
inherit { return INHERIT; }
\.\.\. { return ELLIPSIS; }
\=\= { return EQ; }
\!\= { return NEQ; }
\&\& { return AND; }
\|\| { return OR; }
\-\> { return IMPL; }
\/\/ { return UPDATE; }
\+\+ { return CONCAT; }
{ID} { yylval->t = toATerm(yytext); return ID; /* !!! alloc */ }
{INT} { int n = atoi(yytext); /* !!! overflow */
yylval->n = n;
return INT;
}
\" { BEGIN(STRING); return '"'; }
<STRING>([^\$\"\\]|\$[^\{\"]|\\.)+ {
/* !!! Not quite right: we want a follow restriction on "$", it
shouldn't be followed by a "{". Right now "$\"" will be consumed
as part of a string, rather than a "$" followed by the string
terminator. Disallow "$\"" for now. */
yylval->t = unescapeStr(yytext); /* !!! alloc */
return STR;
}
<STRING>\$\{ { BEGIN(INITIAL); return DOLLAR_CURLY; }
<STRING>\" { BEGIN(INITIAL); return '"'; }
<STRING>. return yytext[0]; /* just in case: shouldn't be reached */
\'\'(\ *\n)? { BEGIN(IND_STRING); return IND_STRING_OPEN; }
<IND_STRING>([^\$\']|\$[^\{\']|\'[^\'\$])+ {
yylval->t = makeIndStr(toATerm(yytext));
return IND_STR;
}
<IND_STRING>\'\'\$ {
yylval->t = makeIndStr(toATerm("$"));
return IND_STR;
}
<IND_STRING>\'\'\' {
yylval->t = makeIndStr(toATerm("''"));
return IND_STR;
}
<IND_STRING>\'\'\\. {
yylval->t = unescapeStr(yytext + 2);
return IND_STR;
}
<IND_STRING>\$\{ { BEGIN(INITIAL); return DOLLAR_CURLY; }
<IND_STRING>\'\' { BEGIN(INITIAL); return IND_STRING_CLOSE; }
<IND_STRING>\' {
yylval->t = makeIndStr(toATerm("'"));
return IND_STR;
}
<IND_STRING>. return yytext[0]; /* just in case: shouldn't be reached */
{PATH} { yylval->t = toATerm(yytext); return PATH; /* !!! alloc */ }
{URI} { yylval->t = toATerm(yytext); return URI; /* !!! alloc */ }
[ \t\r\n]+ /* eat up whitespace */
\#[^\r\n]* /* single-line comments */
\/\*([^*]|\*[^\/])*\*\/ /* long comments */
. return yytext[0];
%%
namespace nix {
/* Horrible, disgusting hack: allow the parser to set the scanner
start condition back to STRING. Necessary in interpolations like
"foo${expr}bar"; after the close brace we have to go back to the
STRING state. */
void backToString(yyscan_t scanner)
{
struct yyguts_t * yyg = (struct yyguts_t *) scanner;
BEGIN(STRING);
}
void backToIndString(yyscan_t scanner)
{
struct yyguts_t * yyg = (struct yyguts_t *) scanner;
BEGIN(IND_STRING);
}
}
|
