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Allow the leading component of a path to be a ~

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This commit is contained in:
Shea Levy 2015-02-19 08:05:16 -05:00
parent 1816ac0db1
commit e0953d53de
3 changed files with 19 additions and 2 deletions
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9
doc/manual/expressions/language-values.xml
View File

@ -155,7 +155,14 @@ stdenv.mkDerivation {
expression that contained it. For instance, if a Nix expression in
<filename>/foo/bar/bla.nix</filename> refers to
<filename>../xyzzy/fnord.nix</filename>, the absolute path is
<filename>/foo/xyzzy/fnord.nix</filename>.</para></listitem>
<filename>/foo/xyzzy/fnord.nix</filename>.</para>
<para>If the first component of a path is a <literal>~</literal>,
it is interpreted as if the rest of the path were relative to the
user's home directory. e.g. <filename>~/foo</filename> would be
equivalent to <filename>/home/edolstra/foo</filename> for a user
whose home directory is <filename>/home/edolstra</filename>.
</para></listitem>
<listitem><para><emphasis>Booleans</emphasis> with values
<literal>true</literal> and

2
src/libexpr/lexer.l
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@ -80,6 +80,7 @@ static Expr * unescapeStr(SymbolTable & symbols, const char * s)
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\%\/\?\:\@\&\=\+\$\,\-\_\.\!\~\*\']+
@ -159,6 +160,7 @@ or { return OR_KW; }
<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; }

10
src/libexpr/parser.y
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@ -268,7 +268,7 @@ void yyerror(YYLTYPE * loc, yyscan_t scanner, ParseData * data, const char * err
%token <id> ID ATTRPATH
%token <e> STR IND_STR
%token <n> INT
%token <path> PATH SPATH
%token <path> PATH HPATH SPATH
%token <uri> URI
%token IF THEN ELSE ASSERT WITH LET IN REC INHERIT EQ NEQ AND OR IMPL OR_KW
%token DOLLAR_CURLY /* == ${ */
@ -376,6 +376,14 @@ expr_simple
$$ = stripIndentation(CUR_POS, data->symbols, *$2);
}
| PATH { $$ = new ExprPath(absPath($1, data->basePath)); }
| HPATH {
auto path = string{$1 + 1};
$$ = new ExprConcatStrings(CUR_POS, false, new vector<Expr *>{
new ExprPath("/"),
new ExprApp(new ExprVar(data->symbols.create("__getEnv")),
new ExprString(data->symbols.create("HOME"))),
new ExprString(data->symbols.create(path))});
}
| SPATH {
string path($1 + 1, strlen($1) - 2);
$$ = new ExprApp(CUR_POS,