diff options
Diffstat (limited to 'src/libexpr/parser.y')
| -rw-r--r-- | src/libexpr/parser.y | 123 |
1 files changed, 31 insertions, 92 deletions
diff --git a/src/libexpr/parser.y b/src/libexpr/parser.y index 22ce7e3f3328..07bf56a1c964 100644 --- a/src/libexpr/parser.y +++ b/src/libexpr/parser.y @@ -44,99 +44,38 @@ struct ParseData }; -#if 0 -static string showAttrPath(ATermList attrPath) +static string showAttrPath(const vector<string> & attrPath) { string s; - for (ATermIterator i(attrPath); i; ++i) { + foreach (vector<string>::const_iterator, i, attrPath) { if (!s.empty()) s += '.'; - s += aterm2String(*i); + s += *i; } return s; } -struct Tree -{ - Expr leaf; ATerm pos; bool recursive; - typedef std::map<ATerm, Tree> Children; - Children children; - Tree() { leaf = 0; recursive = true; } -}; - - -static ATermList buildAttrs(const Tree & t, ATermList & nonrec) +static void addAttr(ExprAttrs * attrs, const vector<string> & attrPath, Expr * e, const Pos & pos) { - ATermList res = ATempty; - for (Tree::Children::const_reverse_iterator i = t.children.rbegin(); - i != t.children.rend(); ++i) - if (!i->second.recursive) - nonrec = ATinsert(nonrec, makeBind(i->first, i->second.leaf, i->second.pos)); - else - res = ATinsert(res, i->second.leaf - ? makeBind(i->first, i->second.leaf, i->second.pos) - : makeBind(i->first, makeAttrs(buildAttrs(i->second, nonrec)), makeNoPos())); - return res; -} -#endif - - -static void fixAttrs(ExprAttrs & attrs) -{ -#if 0 - Tree attrs; - - /* This ATermMap is needed to ensure that the `leaf' fields in the - Tree nodes are not garbage collected. */ - ATermMap gcRoots; - - for (ATermIterator i(as); i; ++i) { - ATermList names, attrPath; Expr src, e; ATerm name, pos; - - if (matchInherit(*i, src, names, pos)) { - bool fromScope = matchScope(src); - for (ATermIterator j(names); j; ++j) { - if (attrs.children.find(*j) != attrs.children.end()) - throw ParseError(format("duplicate definition of attribute `%1%' at %2%") - % showAttrPath(ATmakeList1(*j)) % showPos(pos)); - Tree & t(attrs.children[*j]); - Expr leaf = fromScope ? makeVar(*j) : makeSelect(src, *j); - gcRoots.set(leaf, leaf); - t.leaf = leaf; - t.pos = pos; - if (recursive && fromScope) t.recursive = false; + unsigned int n = 0; + foreach (vector<string>::const_iterator, i, attrPath) { + n++; + if (attrs->attrs[*i]) { + ExprAttrs * attrs2 = dynamic_cast<ExprAttrs *>(attrs->attrs[*i]); + if (!attrs2) + throw ParseError(format("attribute `%1%' at %2% already defined at <SOMEWHERE>") + % showAttrPath(attrPath) % pos); + attrs = attrs2; + } else { + if (n == attrPath.size()) + attrs->attrs[*i] = e; + else { + ExprAttrs * nested = new ExprAttrs; + attrs->attrs[*i] = nested; + attrs = nested; } } - - else if (matchBindAttrPath(*i, attrPath, e, pos)) { - - Tree * t(&attrs); - - for (ATermIterator j(attrPath); j; ) { - name = *j; ++j; - if (t->leaf) throw ParseError(format("attribute set containing `%1%' at %2% already defined at %3%") - % showAttrPath(attrPath) % showPos(pos) % showPos(t->pos)); - t = &(t->children[name]); - } - - if (t->leaf) - throw ParseError(format("duplicate definition of attribute `%1%' at %2% and %3%") - % showAttrPath(attrPath) % showPos(pos) % showPos(t->pos)); - if (!t->children.empty()) - throw ParseError(format("duplicate definition of attribute `%1%' at %2%") - % showAttrPath(attrPath) % showPos(pos)); - - t->leaf = e; t->pos = pos; - } - - else abort(); /* can't happen */ } - - ATermList nonrec = ATempty; - ATermList rec = buildAttrs(attrs, nonrec); - - return recursive ? makeRec(rec, nonrec) : makeAttrs(rec); -#endif } @@ -307,7 +246,7 @@ void yyerror(YYLTYPE * loc, yyscan_t scanner, ParseData * data, const char * err char * id; char * path; char * uri; - std::list<std::string> * ids; + std::vector<std::string> * ids; std::vector<nix::Expr *> * string_parts; } @@ -360,7 +299,7 @@ expr_function | WITH expr ';' expr_function { $$ = new ExprWith(CUR_POS, $2, $4); } | LET binds IN expr_function - { $2->attrs["<let-body>"] = $4; $2->recursive = true; fixAttrs(*$2); $$ = new ExprSelect($2, "<let-body>"); } + { $2->attrs["<let-body>"] = $4; $2->recursive = true; $$ = new ExprSelect($2, "<let-body>"); } | expr_if ; @@ -418,11 +357,11 @@ expr_simple /* Let expressions `let {..., body = ...}' are just desugared into `(rec {..., body = ...}).body'. */ | LET '{' binds '}' - { fixAttrs(*$3); $3->recursive = true; $$ = new ExprSelect($3, "body"); } + { $3->recursive = true; $$ = new ExprSelect($3, "body"); } | REC '{' binds '}' - { fixAttrs(*$3); $3->recursive = true; $$ = $3; } + { $3->recursive = true; $$ = $3; } | '{' binds '}' - { fixAttrs(*$2); $$ = $2; } + { $$ = $2; } | '[' expr_list ']' { $$ = $2; } ; @@ -439,16 +378,16 @@ ind_string_parts ; binds - : binds ID '=' expr ';' { $$ = $1; $$->attrs[$2] = $4; } + : binds attrpath '=' expr ';' { $$ = $1; addAttr($$, *$2, $4, CUR_POS); } | binds INHERIT ids ';' { $$ = $1; - foreach (list<string>::iterator, i, *$3) + foreach (vector<string>::iterator, i, *$3) $$->inherited.push_back(*i); } | binds INHERIT '(' expr ')' ids ';' { $$ = $1; /* !!! Should ensure sharing of the expression in $4. */ - foreach (list<string>::iterator, i, *$6) + foreach (vector<string>::iterator, i, *$6) $$->attrs[*i] = new ExprSelect($4, *i); } | { $$ = new ExprAttrs; } @@ -456,12 +395,12 @@ binds ids : ids ID { $$ = $1; $1->push_back($2); /* !!! dangerous */ } - | { $$ = new list<string>; } + | { $$ = new vector<string>; } ; attrpath - : attrpath '.' ID { $$ = ATinsert($1, $3); } - | ID { $$ = ATmakeList1($1); } + : attrpath '.' ID { $$ = $1; $1->push_back($3); } + | ID { $$ = new vector<string>; $$->push_back($1); } ; expr_list |