1c9c0a5a46
`inherit' variables from the surrounding lexical scope.
E.g.,
{stdenv, libfoo}: derivation {
builder = ./bla;
inherit stdenv libfoo;
xyzzy = 1;
}
is equivalent to
{stdenv, libfoo}: derivation {
builder = ./bla;
stdenv = stdenv;
libfoo = libfoo;
xyzzy = 1;
}
Note that for mutually recursive attribute set definitions (`rec
{...}'), this also works, that is, `rec {inherit x;}' is equivalent
to `let {fresh = x; body = rec {x = fresh;};}', *not*
`rec {x = x}'.
82 lines
1.9 KiB
Text
82 lines
1.9 KiB
Text
%option reentrant bison-bridge bison-locations
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%option noyywrap
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%option never-interactive
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%{
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#include <string.h>
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#include <aterm2.h>
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#include "parser-tab.h"
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static void initLoc(YYLTYPE * loc)
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{
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loc->first_line = 1;
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loc->first_column = 1;
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}
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static void adjustLoc(YYLTYPE * loc, const char * s, size_t len)
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{
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while (len--) {
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switch (*s++) {
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case '\n':
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++loc->first_line;
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loc->first_column = 1;
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break;
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default:
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++loc->first_column;
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}
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}
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}
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#define YY_USER_INIT initLoc(yylloc)
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#define YY_USER_ACTION adjustLoc(yylloc, yytext, yyleng);
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%}
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ID [a-zA-Z\_][a-zA-Z0-9\_\']*
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INT [0-9]+
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STR \"[^\n\"]*\"
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PATH [a-zA-Z0-9\.\_\-\+]*(\/[a-zA-Z0-9\.\_\-\+]+)+
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URI [a-zA-Z][a-zA-Z0-9\+\-\.]*\:[a-zA-Z0-9\%\/\?\:\@\&\=\+\$\,\-\_\.\!\~\*\']*
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%%
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if { return IF; }
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then { return THEN; }
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else { return ELSE; }
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assert { return ASSERT; }
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let { return LET; }
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rec { return REC; }
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inherit { return INHERIT; }
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\=\= { return EQ; }
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\!\= { return NEQ; }
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\&\& { return AND; }
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\|\| { return OR; }
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\-\> { return IMPL; }
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{ID} { yylval->t = ATmake("<str>", yytext); return ID; /* !!! alloc */ }
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{INT} { int n = atoi(yytext); /* !!! overflow */
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yylval->t = ATmake("<int>", n);
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return INT;
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}
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{STR} { int len = strlen(yytext);
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yytext[len - 1] = 0;
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yylval->t = ATmake("<str>", yytext + 1);
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yytext[len - 1] = '\"';
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return STR; /* !!! alloc */
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}
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{PATH} { yylval->t = ATmake("<str>", yytext); return PATH; /* !!! alloc */ }
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{URI} { yylval->t = ATmake("<str>", yytext); return URI; /* !!! alloc */ }
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[ \t\n]+ /* eat up whitespace */
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\#[^\n]* /* single-line comments */
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\/\*(.|\n)*\*\/ /* long comments */
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. return yytext[0];
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%%
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