184 lines
4.9 KiB
Plaintext
184 lines
4.9 KiB
Plaintext
%option reentrant bison-bridge bison-locations
|
||
%option noyywrap
|
||
%option never-interactive
|
||
%option stack
|
||
%option nodefault
|
||
%option nounput noyy_top_state
|
||
|
||
|
||
%x STRING
|
||
%x IND_STRING
|
||
|
||
|
||
%{
|
||
#include "nixexpr.hh"
|
||
#include "parser-tab.hh"
|
||
|
||
using namespace nix;
|
||
|
||
namespace nix {
|
||
|
||
|
||
static void initLoc(YYLTYPE * loc)
|
||
{
|
||
loc->first_line = loc->last_line = 1;
|
||
loc->first_column = loc->last_column = 1;
|
||
}
|
||
|
||
|
||
static void adjustLoc(YYLTYPE * loc, const char * s, size_t len)
|
||
{
|
||
loc->first_line = loc->last_line;
|
||
loc->first_column = loc->last_column;
|
||
|
||
while (len--) {
|
||
switch (*s++) {
|
||
case '\r':
|
||
if (*s == '\n') /* cr/lf */
|
||
s++;
|
||
/* fall through */
|
||
case '\n':
|
||
++loc->last_line;
|
||
loc->last_column = 1;
|
||
break;
|
||
default:
|
||
++loc->last_column;
|
||
}
|
||
}
|
||
}
|
||
|
||
|
||
static Expr * unescapeStr(SymbolTable & symbols, 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 new ExprString(symbols.create(t));
|
||
}
|
||
|
||
|
||
}
|
||
|
||
#define YY_USER_INIT initLoc(yylloc)
|
||
#define YY_USER_ACTION adjustLoc(yylloc, yytext, yyleng);
|
||
|
||
#define PUSH_STATE(state) yy_push_state(state, yyscanner)
|
||
#define POP_STATE() yy_pop_state(yyscanner)
|
||
|
||
%}
|
||
|
||
|
||
ID [a-zA-Z\_][a-zA-Z0-9\_\'\-]*
|
||
INT [0-9]+
|
||
PATH [a-zA-Z0-9\.\_\-\+]*(\/[a-zA-Z0-9\.\_\-\+]+)+
|
||
HPATH \~(\/[a-zA-Z0-9\.\_\-\+]+)+
|
||
SPATH \<[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; }
|
||
or { return OR_KW; }
|
||
\.\.\. { return ELLIPSIS; }
|
||
|
||
\=\= { return EQ; }
|
||
\!\= { return NEQ; }
|
||
\<\= { return LEQ; }
|
||
\>\= { return GEQ; }
|
||
\&\& { return AND; }
|
||
\|\| { return OR; }
|
||
\-\> { return IMPL; }
|
||
\/\/ { return UPDATE; }
|
||
\+\+ { return CONCAT; }
|
||
|
||
{ID} { yylval->id = strdup(yytext); return ID; }
|
||
{INT} { errno = 0;
|
||
yylval->n = strtol(yytext, 0, 10);
|
||
if (errno != 0)
|
||
throw ParseError(format("invalid integer ‘%1%’") % yytext);
|
||
return INT;
|
||
}
|
||
|
||
\$\{ { PUSH_STATE(INITIAL); return DOLLAR_CURLY; }
|
||
\{ { PUSH_STATE(INITIAL); return '{'; }
|
||
\} { POP_STATE(); return '}'; }
|
||
|
||
\" { PUSH_STATE(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->e = unescapeStr(data->symbols, yytext);
|
||
return STR;
|
||
}
|
||
<STRING>\$\{ { PUSH_STATE(INITIAL); return DOLLAR_CURLY; }
|
||
<STRING>\" { POP_STATE(); return '"'; }
|
||
<STRING>. return yytext[0]; /* just in case: shouldn't be reached */
|
||
|
||
\'\'(\ *\n)? { PUSH_STATE(IND_STRING); return IND_STRING_OPEN; }
|
||
<IND_STRING>([^\$\']|\$[^\{\']|\'[^\'\$])+ {
|
||
yylval->e = new ExprIndStr(yytext);
|
||
return IND_STR;
|
||
}
|
||
<IND_STRING>\'\'\$ {
|
||
yylval->e = new ExprIndStr("$");
|
||
return IND_STR;
|
||
}
|
||
<IND_STRING>\'\'\' {
|
||
yylval->e = new ExprIndStr("''");
|
||
return IND_STR;
|
||
}
|
||
<IND_STRING>\'\'\\. {
|
||
yylval->e = unescapeStr(data->symbols, yytext + 2);
|
||
return IND_STR;
|
||
}
|
||
<IND_STRING>\$\{ { PUSH_STATE(INITIAL); return DOLLAR_CURLY; }
|
||
<IND_STRING>\'\' { POP_STATE(); return IND_STRING_CLOSE; }
|
||
<IND_STRING>\' {
|
||
yylval->e = new ExprIndStr("'");
|
||
return IND_STR;
|
||
}
|
||
<IND_STRING>. return yytext[0]; /* just in case: shouldn't be reached */
|
||
|
||
{PATH} { yylval->path = strdup(yytext); return PATH; }
|
||
{HPATH} { yylval->path = strdup(yytext); return HPATH; }
|
||
{SPATH} { yylval->path = strdup(yytext); return SPATH; }
|
||
{URI} { yylval->uri = strdup(yytext); return URI; }
|
||
|
||
[ \t\r\n]+ /* eat up whitespace */
|
||
\#[^\r\n]* /* single-line comments */
|
||
\/\*([^*]|\*[^\/])*\*\/ /* long comments */
|
||
|
||
. return yytext[0];
|
||
|
||
|
||
%%
|
||
|