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// Parser utilities for use in parser.y
#pragma once
// TODO(tazjin): Audit these includes, they were in parser.y
#include <optional>
#include <variant>
#include <glog/logging.h>
#include "libexpr/eval.hh"
#include "libexpr/nixexpr.hh"
#include "libutil/util.hh"
#define YY_DECL \
int yylex(YYSTYPE* yylval_param, YYLTYPE* yylloc_param, yyscan_t yyscanner, \
nix::ParseData* data)
#define CUR_POS makeCurPos(*yylocp, data)
namespace nix {
struct ParseData {
EvalState& state;
SymbolTable& symbols;
Expr* result;
Path basePath;
std::optional<Symbol> path;
std::string error;
Symbol sLetBody;
ParseData(EvalState& state)
: state(state),
symbols(state.symbols),
sLetBody(symbols.Create("<let-body>")){};
};
// Clang fails to identify these functions as used, probably because
// of some interaction between the lexer/parser codegen and something
// else.
//
// To avoid warnings for that we disable -Wunused-function in this block.
#pragma clang diagnostic push
#pragma clang diagnostic ignored "-Wunused-function"
// TODO(tazjin): move dupAttr to anonymous namespace
static void dupAttr(const AttrPath& attrPath, const Pos& pos,
const Pos& prevPos) {
throw ParseError(format("attribute '%1%' at %2% already defined at %3%") %
showAttrPath(attrPath) % pos % prevPos);
}
static void dupAttr(Symbol attr, const Pos& pos, const Pos& prevPos) {
throw ParseError(format("attribute '%1%' at %2% already defined at %3%") %
attr % pos % prevPos);
}
void addAttr(ExprAttrs* attrs, AttrPath& attrPath, Expr* e, const Pos& pos);
void addFormal(const Pos& pos, Formals* formals, const Formal& formal);
Expr* stripIndentation(const Pos& pos, SymbolTable& symbols, VectorExprs& es);
Path resolveExprPath(Path path);
// implementations originally from lexer.l
static Expr* unescapeStr(SymbolTable& symbols, const char* s, size_t length) {
std::string t;
t.reserve(length);
char c;
while ((c = *s++)) {
if (c == '\\') {
assert(*s);
c = *s++;
if (c == 'n') {
t += '\n';
} else if (c == 'r') {
t += '\r';
} else if (c == 't') {
t += '\t';
} else {
t += c;
}
} else if (c == '\r') {
/* Normalise CR and CR/LF into LF. */
t += '\n';
if (*s == '\n') {
s++;
} /* cr/lf */
} else {
t += c;
}
}
return new ExprString(symbols.Create(t));
}
#pragma clang diagnostic pop // re-enable -Wunused-function
} // namespace nix
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