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* When something goes wrong in the evaluation of a Nix expression,

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print a nice backtrace of the stack, rather than vomiting a gigantic
  (and useless) aterm on the screen.  Example:

    error: while evaluating file `.../pkgs/system/test.nix':
    while evaluating attribute `subversion' at `.../pkgs/system/all-packages-generic.nix', line 533:
    while evaluating function at `.../pkgs/applications/version-management/subversion/default.nix', line 1:
    assertion failed at `.../pkgs/applications/version-management/subversion/default.nix', line 13

  Since the Nix expression language is lazy, the trace may be
  misleading.  The purpose is to provide a hint as to the location of
  the problem.
This commit is contained in:
Eelco Dolstra 2004-04-05 22:27:41 +00:00
parent a520b1cbc3
commit 59b94ee18a
8 changed files with 201 additions and 90 deletions
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19
src/libexpr/parser.y
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@ -19,11 +19,20 @@ void setParseResult(void * data, ATerm t);
void parseError(void * data, char * error, int line, int column);
ATerm absParsedPath(void * data, ATerm t);
ATerm fixAttrs(int recursive, ATermList as);
const char * getPath(void * data);
void yyerror(YYLTYPE * loc, yyscan_t scanner, void * data, char * s)
{
parseError(data, s, loc->first_line, loc->first_column);
}
ATerm makePos(YYLTYPE * loc, void * data)
{
return ATmake("Pos(<str>, <int>, <int>)",
getPath(data), loc->first_line, loc->first_column);
}
#define CUR_POS makePos(yylocp, data)
%}
@ -55,15 +64,15 @@ expr: expr_function;
expr_function
: '{' formals '}' ':' expr_function
{ $$ = ATmake("Function(<term>, <term>)", $2, $5); }
{ $$ = ATmake("Function(<term>, <term>, <term>)", $2, $5, CUR_POS); }
| ID ':' expr_function
{ $$ = ATmake("Function1(<term>, <term>)", $1, $3); }
{ $$ = ATmake("Function1(<term>, <term>, <term>)", $1, $3, CUR_POS); }
| expr_assert
;
expr_assert
: ASSERT expr ';' expr_assert
{ $$ = ATmake("Assert(<term>, <term>)", $2, $4); }
{ $$ = ATmake("Assert(<term>, <term>, <term>)", $2, $4, CUR_POS); }
| expr_if
;
@ -123,9 +132,9 @@ binds
bind
: ID '=' expr ';'
{ $$ = ATmake("Bind(<term>, <term>)", $1, $3); }
{ $$ = ATmake("Bind(<term>, <term>, <term>)", $1, $3, CUR_POS); }
| INHERIT inheritsrc ids ';'
{ $$ = ATmake("Inherit(<term>, <term>)", $2, $3); }
{ $$ = ATmake("Inherit(<term>, <term>, <term>)", $2, $3, CUR_POS); }
;
inheritsrc