forked from lix-project/lix
Merge branch 'parser-improvements' of https://github.com/pennae/nix
This commit is contained in:
Eelco Dolstra
commit
17e3f353df
8 changed files with 138 additions and 90 deletions
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@ -1374,7 +1374,7 @@ void EvalState::callFunction(Value & fun, size_t nrArgs, Value * * args, Value &
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/* Nope, so show the first unexpected argument to the
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user. */
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for (auto & i : *args[0]->attrs)
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if (!lambda.formals->argNames.count(i.name))
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if (!lambda.formals->has(i.name))
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throwTypeError(pos, "%1% called with unexpected argument '%2%'", lambda, i.name);
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abort(); // can't happen
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}
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@ -66,7 +66,7 @@ static void adjustLoc(YYLTYPE * loc, const char * s, size_t len)
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// we make use of the fact that the parser receives a private copy of the input
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// string and can munge around in it.
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static Expr * unescapeStr(SymbolTable & symbols, char * s, size_t length)
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static StringToken unescapeStr(SymbolTable & symbols, char * s, size_t length)
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{
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char * result = s;
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char * t = s;
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@ -89,7 +89,7 @@ static Expr * unescapeStr(SymbolTable & symbols, char * s, size_t length)
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else *t = c;
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t++;
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}
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return new ExprString(symbols.create({result, size_t(t - result)}));
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return {result, size_t(t - result)};
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}
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@ -176,7 +176,7 @@ or { return OR_KW; }
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/* It is impossible to match strings ending with '$' with one
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regex because trailing contexts are only valid at the end
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of a rule. (A sane but undocumented limitation.) */
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yylval->e = unescapeStr(data->symbols, yytext, yyleng);
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yylval->str = unescapeStr(data->symbols, yytext, yyleng);
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return STR;
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}
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<STRING>\$\{ { PUSH_STATE(DEFAULT); return DOLLAR_CURLY; }
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@ -191,26 +191,26 @@ or { return OR_KW; }
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\'\'(\ *\n)? { PUSH_STATE(IND_STRING); return IND_STRING_OPEN; }
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<IND_STRING>([^\$\']|\$[^\{\']|\'[^\'\$])+ {
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yylval->e = new ExprIndStr(yytext);
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yylval->str = {yytext, (size_t) yyleng, true};
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return IND_STR;
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}
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<IND_STRING>\'\'\$ |
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<IND_STRING>\$ {
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yylval->e = new ExprIndStr("$");
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yylval->str = {"$", 1};
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return IND_STR;
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}
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<IND_STRING>\'\'\' {
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yylval->e = new ExprIndStr("''");
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yylval->str = {"''", 2};
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return IND_STR;
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}
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<IND_STRING>\'\'\\{ANY} {
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yylval->e = unescapeStr(data->symbols, yytext + 2, yyleng - 2);
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yylval->str = unescapeStr(data->symbols, yytext + 2, yyleng - 2);
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return IND_STR;
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}
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<IND_STRING>\$\{ { PUSH_STATE(DEFAULT); return DOLLAR_CURLY; }
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<IND_STRING>\'\' { POP_STATE(); return IND_STRING_CLOSE; }
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<IND_STRING>\' {
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yylval->e = new ExprIndStr("'");
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yylval->str = {"'", 1};
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return IND_STR;
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}
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@ -264,7 +264,7 @@ or { return OR_KW; }
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PUSH_STATE(INPATH_SLASH);
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else
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PUSH_STATE(INPATH);
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yylval->e = new ExprString(data->symbols.create(string(yytext)));
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yylval->str = {yytext, (size_t) yyleng};
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return STR;
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}
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<INPATH>{ANY} |
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@ -110,20 +110,13 @@ struct ExprFloat : Expr
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struct ExprString : Expr
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{
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Symbol s;
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string s;
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Value v;
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ExprString(const Symbol & s) : s(s) { v.mkString(s); };
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ExprString(std::string s) : s(std::move(s)) { v.mkString(this->s.data()); };
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COMMON_METHODS
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Value * maybeThunk(EvalState & state, Env & env);
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};
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/* Temporary class used during parsing of indented strings. */
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struct ExprIndStr : Expr
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{
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string s;
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ExprIndStr(const string & s) : s(s) { };
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};
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struct ExprPath : Expr
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{
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string s;
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@ -223,10 +216,25 @@ struct Formal
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struct Formals
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{
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typedef std::list<Formal> Formals_;
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typedef std::vector<Formal> Formals_;
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Formals_ formals;
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std::set<Symbol> argNames; // used during parsing
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bool ellipsis;
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bool has(Symbol arg) const {
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auto it = std::lower_bound(formals.begin(), formals.end(), arg,
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[] (const Formal & f, const Symbol & sym) { return f.name < sym; });
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return it != formals.end() && it->name == arg;
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}
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std::vector<Formal> lexicographicOrder() const
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{
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std::vector<Formal> result(formals.begin(), formals.end());
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std::sort(result.begin(), result.end(),
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[] (const Formal & a, const Formal & b) {
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return std::string_view(a.name) < std::string_view(b.name);
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});
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return result;
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}
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};
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struct ExprLambda : Expr
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@ -239,11 +247,6 @@ struct ExprLambda : Expr
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ExprLambda(const Pos & pos, const Symbol & arg, Formals * formals, Expr * body)
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: pos(pos), arg(arg), formals(formals), body(body)
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{
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if (!arg.empty() && formals && formals->argNames.find(arg) != formals->argNames.end())
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throw ParseError({
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.msg = hintfmt("duplicate formal function argument '%1%'", arg),
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.errPos = pos
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});
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};
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void setName(Symbol & name);
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string showNamePos() const;
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@ -16,6 +16,8 @@
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#ifndef BISON_HEADER
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#define BISON_HEADER
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#include <variant>
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#include "util.hh"
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#include "nixexpr.hh"
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@ -39,8 +41,22 @@ namespace nix {
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{ };
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};
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struct ParserFormals {
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std::vector<Formal> formals;
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bool ellipsis = false;
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};
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}
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// using C a struct allows us to avoid having to define the special
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// members that using string_view here would implicitly delete.
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struct StringToken {
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const char * p;
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size_t l;
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bool hasIndentation;
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operator std::string_view() const { return {p, l}; }
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};
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#define YY_DECL int yylex \
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(YYSTYPE * yylval_param, YYLTYPE * yylloc_param, yyscan_t yyscanner, nix::ParseData * data)
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@ -140,21 +156,46 @@ static void addAttr(ExprAttrs * attrs, AttrPath & attrPath,
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}
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static void addFormal(const Pos & pos, Formals * formals, const Formal & formal)
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static Formals * toFormals(ParseData & data, ParserFormals * formals,
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Pos pos = noPos, Symbol arg = {})
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{
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if (!formals->argNames.insert(formal.name).second)
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std::sort(formals->formals.begin(), formals->formals.end(),
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[] (const auto & a, const auto & b) {
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return std::tie(a.name, a.pos) < std::tie(b.name, b.pos);
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});
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std::optional<std::pair<Symbol, Pos>> duplicate;
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for (size_t i = 0; i + 1 < formals->formals.size(); i++) {
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if (formals->formals[i].name != formals->formals[i + 1].name)
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continue;
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std::pair thisDup{formals->formals[i].name, formals->formals[i + 1].pos};
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duplicate = std::min(thisDup, duplicate.value_or(thisDup));
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}
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if (duplicate)
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throw ParseError({
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.msg = hintfmt("duplicate formal function argument '%1%'",
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formal.name),
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.msg = hintfmt("duplicate formal function argument '%1%'", duplicate->first),
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.errPos = duplicate->second
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});
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Formals result;
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result.ellipsis = formals->ellipsis;
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result.formals = std::move(formals->formals);
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if (arg.set() && result.has(arg))
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throw ParseError({
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.msg = hintfmt("duplicate formal function argument '%1%'", arg),
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.errPos = pos
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});
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formals->formals.push_front(formal);
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delete formals;
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return new Formals(std::move(result));
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}
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static Expr * stripIndentation(const Pos & pos, SymbolTable & symbols, vector<std::pair<Pos, Expr *> > & es)
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static Expr * stripIndentation(const Pos & pos, SymbolTable & symbols,
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vector<std::pair<Pos, std::variant<Expr *, StringToken> > > & es)
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{
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if (es.empty()) return new ExprString(symbols.create(""));
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if (es.empty()) return new ExprString("");
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/* Figure out the minimum indentation. Note that by design
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whitespace-only final lines are not taken into account. (So
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@ -163,20 +204,20 @@ static Expr * stripIndentation(const Pos & pos, SymbolTable & symbols, vector<st
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size_t minIndent = 1000000;
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size_t curIndent = 0;
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for (auto & [i_pos, i] : es) {
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ExprIndStr * e = dynamic_cast<ExprIndStr *>(i);
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if (!e) {
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/* Anti-quotations end the current start-of-line whitespace. */
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auto * str = std::get_if<StringToken>(&i);
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if (!str || !str->hasIndentation) {
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/* Anti-quotations and escaped characters end the current start-of-line whitespace. */
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if (atStartOfLine) {
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atStartOfLine = false;
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if (curIndent < minIndent) minIndent = curIndent;
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}
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continue;
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}
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for (size_t j = 0; j < e->s.size(); ++j) {
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for (size_t j = 0; j < str->l; ++j) {
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if (atStartOfLine) {
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if (e->s[j] == ' ')
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if (str->p[j] == ' ')
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curIndent++;
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else if (e->s[j] == '\n') {
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else if (str->p[j] == '\n') {
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/* Empty line, doesn't influence minimum
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indentation. */
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curIndent = 0;
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@ -184,7 +225,7 @@ static Expr * stripIndentation(const Pos & pos, SymbolTable & symbols, vector<st
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atStartOfLine = false;
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if (curIndent < minIndent) minIndent = curIndent;
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}
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} else if (e->s[j] == '\n') {
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} else if (str->p[j] == '\n') {
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atStartOfLine = true;
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curIndent = 0;
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}
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@ -196,33 +237,31 @@ static Expr * stripIndentation(const Pos & pos, SymbolTable & symbols, vector<st
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atStartOfLine = true;
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size_t curDropped = 0;
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size_t n = es.size();
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for (vector<std::pair<Pos, Expr *> >::iterator i = es.begin(); i != es.end(); ++i, --n) {
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ExprIndStr * e = dynamic_cast<ExprIndStr *>(i->second);
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if (!e) {
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atStartOfLine = false;
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curDropped = 0;
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es2->push_back(*i);
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continue;
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}
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auto i = es.begin();
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const auto trimExpr = [&] (Expr * e) {
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atStartOfLine = false;
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curDropped = 0;
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es2->emplace_back(i->first, e);
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};
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const auto trimString = [&] (const StringToken & t) {
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string s2;
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for (size_t j = 0; j < e->s.size(); ++j) {
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for (size_t j = 0; j < t.l; ++j) {
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if (atStartOfLine) {
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if (e->s[j] == ' ') {
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if (t.p[j] == ' ') {
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if (curDropped++ >= minIndent)
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s2 += e->s[j];
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s2 += t.p[j];
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}
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else if (e->s[j] == '\n') {
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else if (t.p[j] == '\n') {
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curDropped = 0;
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s2 += e->s[j];
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s2 += t.p[j];
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} else {
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atStartOfLine = false;
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curDropped = 0;
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s2 += e->s[j];
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s2 += t.p[j];
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}
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} else {
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s2 += e->s[j];
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if (e->s[j] == '\n') atStartOfLine = true;
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s2 += t.p[j];
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if (t.p[j] == '\n') atStartOfLine = true;
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}
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}
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@ -234,7 +273,10 @@ static Expr * stripIndentation(const Pos & pos, SymbolTable & symbols, vector<st
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s2 = string(s2, 0, p + 1);
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}
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es2->emplace_back(i->first, new ExprString(symbols.create(s2)));
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es2->emplace_back(i->first, new ExprString(s2));
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};
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for (; i != es.end(); ++i, --n) {
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std::visit(overloaded { trimExpr, trimString }, i->second);
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}
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/* If this is a single string, then don't do a concatenation. */
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@ -269,22 +311,17 @@ void yyerror(YYLTYPE * loc, yyscan_t scanner, ParseData * data, const char * err
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nix::Expr * e;
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nix::ExprList * list;
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nix::ExprAttrs * attrs;
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nix::Formals * formals;
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nix::ParserFormals * formals;
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nix::Formal * formal;
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nix::NixInt n;
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nix::NixFloat nf;
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// using C a struct allows us to avoid having to define the special
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// members that using string_view here would implicitly delete.
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struct StringToken {
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const char * p;
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size_t l;
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operator std::string_view() const { return {p, l}; }
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};
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StringToken id; // !!! -> Symbol
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StringToken path;
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StringToken uri;
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StringToken str;
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std::vector<nix::AttrName> * attrNames;
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std::vector<std::pair<nix::Pos, nix::Expr *> > * string_parts;
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std::vector<std::pair<nix::Pos, std::variant<nix::Expr *, StringToken> > > * ind_string_parts;
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}
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%type <e> start expr expr_function expr_if expr_op
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|
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@ -294,11 +331,12 @@ void yyerror(YYLTYPE * loc, yyscan_t scanner, ParseData * data, const char * err
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%type <formals> formals
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%type <formal> formal
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%type <attrNames> attrs attrpath
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%type <string_parts> string_parts_interpolated ind_string_parts
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%type <string_parts> string_parts_interpolated
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%type <ind_string_parts> ind_string_parts
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%type <e> path_start string_parts string_attr
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%type <id> attr
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%token <id> ID ATTRPATH
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%token <e> STR IND_STR
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%token <str> STR IND_STR
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%token <n> INT
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%token <nf> FLOAT
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%token <path> PATH HPATH SPATH PATH_END
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|
|
@ -331,11 +369,17 @@ expr_function
|
|||
: ID ':' expr_function
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{ $$ = new ExprLambda(CUR_POS, data->symbols.create($1), 0, $3); }
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| '{' formals '}' ':' expr_function
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{ $$ = new ExprLambda(CUR_POS, data->symbols.create(""), $2, $5); }
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{ $$ = new ExprLambda(CUR_POS, data->symbols.create(""), toFormals(*data, $2), $5); }
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| '{' formals '}' '@' ID ':' expr_function
|
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{ $$ = new ExprLambda(CUR_POS, data->symbols.create($5), $2, $7); }
|
||||
{
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Symbol arg = data->symbols.create($5);
|
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$$ = new ExprLambda(CUR_POS, arg, toFormals(*data, $2, CUR_POS, arg), $7);
|
||||
}
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| ID '@' '{' formals '}' ':' expr_function
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{ $$ = new ExprLambda(CUR_POS, data->symbols.create($1), $4, $7); }
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{
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Symbol arg = data->symbols.create($1);
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$$ = new ExprLambda(CUR_POS, arg, toFormals(*data, $4, CUR_POS, arg), $7);
|
||||
}
|
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| ASSERT expr ';' expr_function
|
||||
{ $$ = new ExprAssert(CUR_POS, $2, $4); }
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| WITH expr ';' expr_function
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||||
|
|
@ -426,7 +470,7 @@ expr_simple
|
|||
$$ = new ExprCall(CUR_POS,
|
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new ExprVar(data->symbols.create("__findFile")),
|
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{new ExprVar(data->symbols.create("__nixPath")),
|
||||
new ExprString(data->symbols.create(path))});
|
||||
new ExprString(path)});
|
||||
}
|
||||
| URI {
|
||||
static bool noURLLiterals = settings.isExperimentalFeatureEnabled(Xp::NoUrlLiterals);
|
||||
|
|
@ -435,7 +479,7 @@ expr_simple
|
|||
.msg = hintfmt("URL literals are disabled"),
|
||||
.errPos = CUR_POS
|
||||
});
|
||||
$$ = new ExprString(data->symbols.create($1));
|
||||
$$ = new ExprString(string($1));
|
||||
}
|
||||
| '(' expr ')' { $$ = $2; }
|
||||
/* Let expressions `let {..., body = ...}' are just desugared
|
||||
|
|
@ -450,18 +494,19 @@ expr_simple
|
|||
;
|
||||
|
||||
string_parts
|
||||
: STR
|
||||
: STR { $$ = new ExprString(string($1)); }
|
||||
| string_parts_interpolated { $$ = new ExprConcatStrings(CUR_POS, true, $1); }
|
||||
| { $$ = new ExprString(data->symbols.create("")); }
|
||||
| { $$ = new ExprString(""); }
|
||||
;
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||||
|
||||
string_parts_interpolated
|
||||
: string_parts_interpolated STR { $$ = $1; $1->emplace_back(makeCurPos(@2, data), $2); }
|
||||
: string_parts_interpolated STR
|
||||
{ $$ = $1; $1->emplace_back(makeCurPos(@2, data), new ExprString(string($2))); }
|
||||
| string_parts_interpolated DOLLAR_CURLY expr '}' { $$ = $1; $1->emplace_back(makeCurPos(@2, data), $3); }
|
||||
| DOLLAR_CURLY expr '}' { $$ = new vector<std::pair<Pos, Expr *> >; $$->emplace_back(makeCurPos(@1, data), $2); }
|
||||
| STR DOLLAR_CURLY expr '}' {
|
||||
$$ = new vector<std::pair<Pos, Expr *> >;
|
||||
$$->emplace_back(makeCurPos(@1, data), $1);
|
||||
$$->emplace_back(makeCurPos(@1, data), new ExprString(string($1)));
|
||||
$$->emplace_back(makeCurPos(@2, data), $3);
|
||||
}
|
||||
;
|
||||
|
|
@ -483,7 +528,7 @@ path_start
|
|||
ind_string_parts
|
||||
: ind_string_parts IND_STR { $$ = $1; $1->emplace_back(makeCurPos(@2, data), $2); }
|
||||
| ind_string_parts DOLLAR_CURLY expr '}' { $$ = $1; $1->emplace_back(makeCurPos(@2, data), $3); }
|
||||
| { $$ = new vector<std::pair<Pos, Expr *> >; }
|
||||
| { $$ = new vector<std::pair<Pos, std::variant<Expr *, StringToken> > >; }
|
||||
;
|
||||
|
||||
binds
|
||||
|
|
@ -515,7 +560,7 @@ attrs
|
|||
{ $$ = $1;
|
||||
ExprString * str = dynamic_cast<ExprString *>($2);
|
||||
if (str) {
|
||||
$$->push_back(AttrName(str->s));
|
||||
$$->push_back(AttrName(data->symbols.create(str->s)));
|
||||
delete str;
|
||||
} else
|
||||
throw ParseError({
|
||||
|
|
@ -532,7 +577,7 @@ attrpath
|
|||
{ $$ = $1;
|
||||
ExprString * str = dynamic_cast<ExprString *>($3);
|
||||
if (str) {
|
||||
$$->push_back(AttrName(str->s));
|
||||
$$->push_back(AttrName(data->symbols.create(str->s)));
|
||||
delete str;
|
||||
} else
|
||||
$$->push_back(AttrName($3));
|
||||
|
|
@ -542,7 +587,7 @@ attrpath
|
|||
{ $$ = new vector<AttrName>;
|
||||
ExprString *str = dynamic_cast<ExprString *>($1);
|
||||
if (str) {
|
||||
$$->push_back(AttrName(str->s));
|
||||
$$->push_back(AttrName(data->symbols.create(str->s)));
|
||||
delete str;
|
||||
} else
|
||||
$$->push_back(AttrName($1));
|
||||
|
|
@ -566,13 +611,13 @@ expr_list
|
|||
|
||||
formals
|
||||
: formal ',' formals
|
||||
{ $$ = $3; addFormal(CUR_POS, $$, *$1); }
|
||||
{ $$ = $3; $$->formals.push_back(*$1); }
|
||||
| formal
|
||||
{ $$ = new Formals; addFormal(CUR_POS, $$, *$1); $$->ellipsis = false; }
|
||||
{ $$ = new ParserFormals; $$->formals.push_back(*$1); $$->ellipsis = false; }
|
||||
|
|
||||
{ $$ = new Formals; $$->ellipsis = false; }
|
||||
{ $$ = new ParserFormals; $$->ellipsis = false; }
|
||||
| ELLIPSIS
|
||||
{ $$ = new Formals; $$->ellipsis = true; }
|
||||
{ $$ = new ParserFormals; $$->ellipsis = true; }
|
||||
;
|
||||
|
||||
formal
|
||||
|
|
|
|||
|
|
@ -142,7 +142,7 @@ static void printValueAsXML(EvalState & state, bool strict, bool location,
|
|||
if (!v.lambda.fun->arg.empty()) attrs["name"] = v.lambda.fun->arg;
|
||||
if (v.lambda.fun->formals->ellipsis) attrs["ellipsis"] = "1";
|
||||
XMLOpenElement _(doc, "attrspat", attrs);
|
||||
for (auto & i : v.lambda.fun->formals->formals)
|
||||
for (auto & i : v.lambda.fun->formals->lexicographicOrder())
|
||||
doc.writeEmptyElement("attr", singletonAttrs("name", i.name));
|
||||
} else
|
||||
doc.writeEmptyElement("varpat", singletonAttrs("name", v.lambda.fun->arg));
|
||||
|
|
|
|||
|
|
@ -476,8 +476,8 @@ struct CmdFlakeCheck : FlakeCommand
|
|||
if (!v.isLambda())
|
||||
throw Error("bundler must be a function");
|
||||
if (!v.lambda.fun->formals ||
|
||||
!v.lambda.fun->formals->argNames.count(state->symbols.create("program")) ||
|
||||
!v.lambda.fun->formals->argNames.count(state->symbols.create("system")))
|
||||
!v.lambda.fun->formals->has(state->symbols.create("program")) ||
|
||||
!v.lambda.fun->formals->has(state->symbols.create("system")))
|
||||
throw Error("bundler must take formal arguments 'program' and 'system'");
|
||||
} catch (Error & e) {
|
||||
e.addTrace(pos, hintfmt("while checking the template '%s'", attrPath));
|
||||
|
|
|
|||
|
|
@ -50,6 +50,6 @@ with import ./config.nix;
|
|||
|
||||
fetchurl = import <nix/fetchurl.nix> {
|
||||
url = "file://" + toString ./lang/eval-okay-xml.exp.xml;
|
||||
sha256 = "0kg4sla7ihm8ijr8cb3117fhl99zrc2bwy1jrngsfmkh8bav4m0v";
|
||||
sha256 = "sha256-behBlX+DQK/Pjvkuc8Tx68Jwi4E5v86wDq+ZLaHyhQE=";
|
||||
};
|
||||
}
|
||||
|
|
|
|||
|
|
@ -31,9 +31,9 @@
|
|||
<attr name="f">
|
||||
<function>
|
||||
<attrspat>
|
||||
<attr name="z" />
|
||||
<attr name="x" />
|
||||
<attr name="y" />
|
||||
<attr name="z" />
|
||||
</attrspat>
|
||||
</function>
|
||||
</attr>
|
||||
|
|
|
|||
Loading…
Reference in a new issue