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First hit at providing support for floats in the language.

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This commit is contained in:
Christian Theune 2016-01-05 00:40:40 +01:00
parent b8258a4475
commit 14ebde5289
16 changed files with 207 additions and 23 deletions
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56
src/libexpr/eval.cc
View file

@ -128,6 +128,8 @@ static void printValue(std::ostream & str, std::set<const Value *> & active, con
case tExternal:
str << *v.external;
break;
case tFloat:
str << v.fpoint;
default:
throw Error("invalid value");
}
@ -161,6 +163,7 @@ string showType(const Value & v)
case tPrimOp: return "a built-in function";
case tPrimOpApp: return "a partially applied built-in function";
case tExternal: return v.external->showType();
case tFloat: return "a float";
}
abort();
}
@ -577,6 +580,12 @@ Value * ExprInt::maybeThunk(EvalState & state, Env & env)
return &v;
}
Value * ExprFloat::maybeThunk(EvalState & state, Env & env)
{
nrAvoided++;
return &v;
}
Value * ExprPath::maybeThunk(EvalState & state, Env & env)
{
nrAvoided++;
@ -664,6 +673,11 @@ void ExprInt::eval(EvalState & state, Env & env, Value & v)
}
void ExprFloat::eval(EvalState & state, Env & env, Value & v)
{
v = this->v;
}
void ExprString::eval(EvalState & state, Env & env, Value & v)
{
v = this->v;
@ -1209,6 +1223,7 @@ void ExprConcatStrings::eval(EvalState & state, Env & env, Value & v)
PathSet context;
std::ostringstream s;
NixInt n = 0;
NixFloat nf = 0;
bool first = !forceString;
ValueType firstType = tString;
@ -1227,15 +1242,30 @@ void ExprConcatStrings::eval(EvalState & state, Env & env, Value & v)
}
if (firstType == tInt) {
if (vTmp.type != tInt)
if (vTmp.type == tInt) {
n += vTmp.integer;
} else if (vTmp.type == tFloat) {
// Upgrade the type from int to float;
firstType = tFloat;
nf = n;
nf += vTmp.fpoint;
} else
throwEvalError("cannot add %1% to an integer, at %2%", showType(vTmp), pos);
n += vTmp.integer;
} else if (firstType == tFloat) {
if (vTmp.type == tInt) {
nf += vTmp.integer;
} else if (vTmp.type == tFloat) {
nf += vTmp.fpoint;
} else
throwEvalError("cannot add %1% to a float, at %2%", showType(vTmp), pos);
} else
s << state.coerceToString(pos, vTmp, context, false, firstType == tString);
}
if (firstType == tInt)
mkInt(v, n);
else if (firstType == tFloat)
mkFloat(v, nf);
else if (firstType == tPath) {
if (!context.empty())
throwEvalError("a string that refers to a store path cannot be appended to a path, at %1%", pos);
@ -1293,6 +1323,17 @@ NixInt EvalState::forceInt(Value & v, const Pos & pos)
}
NixFloat EvalState::forceFloat(Value & v, const Pos & pos)
{
forceValue(v, pos);
if (v.type == tInt)
return v.integer;
else if (v.type != tFloat)
throwTypeError("value is %1% while a float was expected, at %2%", v, pos);
return v.fpoint;
}
bool EvalState::forceBool(Value & v)
{
forceValue(v);
@ -1404,6 +1445,7 @@ string EvalState::coerceToString(const Pos & pos, Value & v, PathSet & context,
if (v.type == tBool && v.boolean) return "1";
if (v.type == tBool && !v.boolean) return "";
if (v.type == tInt) return std::to_string(v.integer);
if (v.type == tFloat) return std::to_string(v.fpoint);
if (v.type == tNull) return "";
if (v.isList()) {
@ -1465,6 +1507,13 @@ bool EvalState::eqValues(Value & v1, Value & v2)
uniqList on a list of sets.) Will remove this eventually. */
if (&v1 == &v2) return true;
// Special case type-compatibility between float and int
if (v1.type == tInt && v2.type == tFloat)
return v1.integer == v2.fpoint;
if (v1.type == tFloat && v2.type == tInt)
return v1.fpoint == v2.integer;
// All other types are not compatible with each other.
if (v1.type != v2.type) return false;
switch (v1.type) {
@ -1522,6 +1571,9 @@ bool EvalState::eqValues(Value & v1, Value & v2)
case tExternal:
return *v1.external == *v2.external;
case tFloat:
return v1.fpoint == v2.fpoint;
default:
throwEvalError("cannot compare %1% with %2%", showType(v1), showType(v2));
}

1
src/libexpr/eval.hh
View file

@ -144,6 +144,7 @@ public:
/* Force `v', and then verify that it has the expected type. */
NixInt forceInt(Value & v, const Pos & pos);
NixFloat forceFloat(Value & v, const Pos & pos);
bool forceBool(Value & v);
inline void forceAttrs(Value & v);
inline void forceAttrs(Value & v, const Pos & pos);

21
src/libexpr/get-drvs.cc
View file

@ -106,7 +106,8 @@ bool DrvInfo::checkMeta(Value & v)
if (!checkMeta(*i.value)) return false;
return true;
}
else return v.type == tInt || v.type == tBool || v.type == tString;
else return v.type == tInt || v.type == tBool || v.type == tString ||
v.type == tFloat;
}
@ -127,7 +128,7 @@ string DrvInfo::queryMetaString(const string & name)
}
int DrvInfo::queryMetaInt(const string & name, int def)
NixInt DrvInfo::queryMetaInt(const string & name, NixInt def)
{
Value * v = queryMeta(name);
if (!v) return def;
@ -135,12 +136,26 @@ int DrvInfo::queryMetaInt(const string & name, int def)
if (v->type == tString) {
/* Backwards compatibility with before we had support for
integer meta fields. */
int n;
NixInt n;
if (string2Int(v->string.s, n)) return n;
}
return def;
}
NixFloat DrvInfo::queryMetaFloat(const string & name, NixFloat def)
{
Value * v = queryMeta(name);
if (!v) return def;
if (v->type == tFloat) return v->fpoint;
if (v->type == tString) {
/* Backwards compatibility with before we had support for
float meta fields. */
NixFloat n;
if (string2Float(v->string.s, n)) return n;
}
return def;
}
bool DrvInfo::queryMetaBool(const string & name, bool def)
{

3
src/libexpr/get-drvs.hh
View file

@ -47,7 +47,8 @@ public:
StringSet queryMetaNames();
Value * queryMeta(const string & name);
string queryMetaString(const string & name);
int queryMetaInt(const string & name, int def);
NixInt queryMetaInt(const string & name, NixInt def);
NixFloat queryMetaFloat(const string & name, NixFloat def);
bool queryMetaBool(const string & name, bool def);
void setMeta(const string & name, Value * v);

25
src/libexpr/json-to-value.cc
View file

@ -105,17 +105,22 @@ static void parseJSON(EvalState & state, const char * & s, Value & v)
mkString(v, parseJSONString(s));
}
else if (isdigit(*s) || *s == '-') {
bool neg = false;
if (*s == '-') {
neg = true;
if (!*++s) throw JSONParseError("unexpected end of JSON number");
else if (isdigit(*s) || *s == '-' || *s == '.' ) {
// Buffer into a string first, then use built-in C++ conversions
std::string tmp_number;
ValueType number_type = tInt;
while (isdigit(*s) || *s == '-' || *s == '.' || *s == 'e' || *s == 'E') {
if (*s == '.' || *s == 'e' || *s == 'E')
number_type = tFloat;
tmp_number.append(*s++, 1);
}
if (number_type == tFloat) {
mkFloat(v, stod(tmp_number));
} else {
mkInt(v, stoi(tmp_number));
}
NixInt n = 0;
// FIXME: detect overflow
while (isdigit(*s)) n = n * 10 + (*s++ - '0');
if (*s == '.' || *s == 'e') throw JSONParseError("floating point JSON numbers are not supported");
mkInt(v, neg ? -n : n);
}
else if (strncmp(s, "true", 4) == 0) {

7
src/libexpr/lexer.l
View file

@ -85,6 +85,7 @@ static Expr * unescapeStr(SymbolTable & symbols, const char * s)
ID [a-zA-Z\_][a-zA-Z0-9\_\'\-]*
INT [0-9]+
FLOAT {INT}[0-9]+\.[0-9]+[eE]-?{INT}
PATH [a-zA-Z0-9\.\_\-\+]*(\/[a-zA-Z0-9\.\_\-\+]+)+
HPATH \~(\/[a-zA-Z0-9\.\_\-\+]+)+
SPATH \<[a-zA-Z0-9\.\_\-\+]+(\/[a-zA-Z0-9\.\_\-\+]+)*\>
@ -123,6 +124,12 @@ or { return OR_KW; }
throw ParseError(format("invalid integer ‘%1%’") % yytext);
return INT;
}
{FLOAT} { errno = 0;
yylval->n = strtod(yytext, 0);
if (errno != 0)
throw ParseError(format("invalid float ‘%1%’") % yytext);
return FLOAT;
}
\$\{ { PUSH_STATE(INITIAL); return DOLLAR_CURLY; }
\{ { PUSH_STATE(INITIAL); return '{'; }

9
src/libexpr/nixexpr.cc
View file

@ -68,6 +68,11 @@ void ExprInt::show(std::ostream & str)
str << n;
}
void ExprFloat::show(std::ostream & str)
{
str << nf;
}
void ExprString::show(std::ostream & str)
{
showString(str, s);
@ -226,6 +231,10 @@ void ExprInt::bindVars(const StaticEnv & env)
{
}
void ExprFloat::bindVars(const StaticEnv & env)
{
}
void ExprString::bindVars(const StaticEnv & env)
{
}

9
src/libexpr/nixexpr.hh
View file

@ -98,6 +98,15 @@ struct ExprInt : Expr
Value * maybeThunk(EvalState & state, Env & env);
};
struct ExprFloat : Expr
{
NixFloat nf;
Value v;
ExprFloat(NixFloat nf) : nf(nf) { mkFloat(v, nf); };
COMMON_METHODS
Value * maybeThunk(EvalState & state, Env & env);
};
struct ExprString : Expr
{
Symbol s;

3
src/libexpr/parser.y
View file

@ -244,6 +244,7 @@ void yyerror(YYLTYPE * loc, yyscan_t scanner, ParseData * data, const char * err
nix::Formals * formals;
nix::Formal * formal;
nix::NixInt n;
nix::NixFloat nf;
const char * id; // !!! -> Symbol
char * path;
char * uri;
@ -264,6 +265,7 @@ 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 <nf> FLOAT
%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
@ -366,6 +368,7 @@ expr_simple
$$ = new ExprVar(CUR_POS, data->symbols.create($1));
}
| INT { $$ = new ExprInt($1); }
| FLOAT { $$ = new ExprFloat($1); }
| '"' string_parts '"' { $$ = $2; }
| IND_STRING_OPEN ind_string_parts IND_STRING_CLOSE {
$$ = stripIndentation(CUR_POS, data->symbols, *$2);

41
src/libexpr/primops.cc
View file

@ -197,6 +197,7 @@ static void prim_typeOf(EvalState & state, const Pos & pos, Value * * args, Valu
case tExternal:
t = args[0]->external->typeOf();
break;
case tFloat: t = "float"; break;
default: abort();
}
mkString(v, state.symbols.create(t));
@ -226,6 +227,12 @@ static void prim_isInt(EvalState & state, const Pos & pos, Value * * args, Value
mkBool(v, args[0]->type == tInt);
}
/* Determine whether the argument is a float. */
static void prim_isFloat(EvalState & state, const Pos & pos, Value * * args, Value & v)
{
state.forceValue(*args[0]);
mkBool(v, args[0]->type == tFloat);
}
/* Determine whether the argument is a string. */
static void prim_isString(EvalState & state, const Pos & pos, Value * * args, Value & v)
@ -247,11 +254,17 @@ struct CompareValues
{
bool operator () (const Value * v1, const Value * v2) const
{
if (v1->type == tFloat && v2->type == tInt)
return v1->fpoint < v2->integer;
if (v1->type == tInt && v2->type == tFloat)
return v1->integer < v2->fpoint;
if (v1->type != v2->type)
throw EvalError("cannot compare values of different types");
switch (v1->type) {
case tInt:
return v1->integer < v2->integer;
case tFloat:
return v1->fpoint < v2->fpoint;
case tString:
return strcmp(v1->string.s, v2->string.s) < 0;
case tPath:
@ -1424,27 +1437,40 @@ static void prim_sort(EvalState & state, const Pos & pos, Value * * args, Value
static void prim_add(EvalState & state, const Pos & pos, Value * * args, Value & v)
{
mkInt(v, state.forceInt(*args[0], pos) + state.forceInt(*args[1], pos));
if (args[0]->type == tFloat || args[1]->type == tFloat)
mkFloat(v, state.forceFloat(*args[0], pos) + state.forceFloat(*args[1], pos));
else
mkInt(v, state.forceInt(*args[0], pos) + state.forceInt(*args[1], pos));
}
static void prim_sub(EvalState & state, const Pos & pos, Value * * args, Value & v)
{
mkInt(v, state.forceInt(*args[0], pos) - state.forceInt(*args[1], pos));
if (args[0]->type == tFloat || args[1]->type == tFloat)
mkFloat(v, state.forceFloat(*args[0], pos) - state.forceFloat(*args[1], pos));
else
mkInt(v, state.forceInt(*args[0], pos) - state.forceInt(*args[1], pos));
}
static void prim_mul(EvalState & state, const Pos & pos, Value * * args, Value & v)
{
mkInt(v, state.forceInt(*args[0], pos) * state.forceInt(*args[1], pos));
if (args[0]->type == tFloat || args[1]->type == tFloat)
mkFloat(v, state.forceFloat(*args[0], pos) * state.forceFloat(*args[1], pos));
else
mkInt(v, state.forceInt(*args[0], pos) * state.forceInt(*args[1], pos));
}
static void prim_div(EvalState & state, const Pos & pos, Value * * args, Value & v)
{
NixInt i2 = state.forceInt(*args[1], pos);
if (i2 == 0) throw EvalError(format("division by zero, at %1%") % pos);
mkInt(v, state.forceInt(*args[0], pos) / i2);
NixFloat f2 = state.forceFloat(*args[1], pos);
if (f2 == 0) throw EvalError(format("division by zero, at %1%") % pos);
if (args[0]->type == tFloat || args[1]->type == tFloat)
mkFloat(v, state.forceFloat(*args[0], pos) / state.forceFloat(*args[1], pos));
else
mkInt(v, state.forceInt(*args[0], pos) / state.forceInt(*args[1], pos));
}
@ -1736,7 +1762,7 @@ void EvalState::createBaseEnv()
language feature gets added. It's not necessary to increase it
when primops get added, because you can just use `builtins ?
primOp' to check. */
mkInt(v, 3);
mkInt(v, 4);
addConstant("__langVersion", v);
// Miscellaneous
@ -1753,6 +1779,7 @@ void EvalState::createBaseEnv()
addPrimOp("__isFunction", 1, prim_isFunction);
addPrimOp("__isString", 1, prim_isString);
addPrimOp("__isInt", 1, prim_isInt);
addPrimOp("__isFloat", 1, prim_isFloat);
addPrimOp("__isBool", 1, prim_isBool);
addPrimOp("__genericClosure", 1, prim_genericClosure);
addPrimOp("abort", 1, prim_abort);

4
src/libexpr/value-to-json.cc
View file

@ -84,6 +84,10 @@ void printValueAsJSON(EvalState & state, bool strict,
v.external->printValueAsJSON(state, strict, str, context);
break;
case tFloat:
str << v.fpoint;
break;
default:
throw TypeError(format("cannot convert %1% to JSON") % showType(v));
}

4
src/libexpr/value-to-xml.cc
View file

@ -148,6 +148,10 @@ static void printValueAsXML(EvalState & state, bool strict, bool location,
v.external->printValueAsXML(state, strict, location, doc, context, drvsSeen);
break;
case tFloat:
doc.writeEmptyElement("float", singletonAttrs("value", (format("%1%") % v.fpoint).str()));
break;
default:
doc.writeEmptyElement("unevaluated");
}

11
src/libexpr/value.hh
View file

@ -22,6 +22,7 @@ typedef enum {
tPrimOp,
tPrimOpApp,
tExternal,
tFloat
} ValueType;
@ -38,6 +39,7 @@ class XMLWriter;
typedef long NixInt;
typedef double NixFloat;
/* External values must descend from ExternalValueBase, so that
* type-agnostic nix functions (e.g. showType) can be implemented
@ -141,6 +143,7 @@ struct Value
Value * left, * right;
} primOpApp;
ExternalValueBase * external;
NixFloat fpoint;
};
bool isList() const
@ -181,6 +184,14 @@ static inline void mkInt(Value & v, NixInt n)
}
static inline void mkFloat(Value & v, NixFloat n)
{
clearValue(v);
v.type = tFloat;
v.fpoint = n;
}
static inline void mkBool(Value & v, bool b)
{
clearValue(v);

24
src/libmain/shared.hh
View file

@ -66,6 +66,30 @@ template<class N> N getIntArg(const string & opt,
return n * multiplier;
}
template<class N> N getFloatArg(const string & opt,
Strings::iterator & i, const Strings::iterator & end, bool allowUnit)
{
++i;
if (i == end) throw UsageError(format("‘%1%’ requires an argument") % opt);
string s = *i;
N multiplier = 1;
if (allowUnit && !s.empty()) {
char u = std::toupper(*s.rbegin());
if (std::isalpha(u)) {
if (u == 'K') multiplier = 1ULL << 10;
else if (u == 'M') multiplier = 1ULL << 20;
else if (u == 'G') multiplier = 1ULL << 30;
else if (u == 'T') multiplier = 1ULL << 40;
else throw UsageError(format("invalid unit specifier ‘%1%’") % u);
s.resize(s.size() - 1);
}
}
N n;
if (!string2Float(s, n))
throw UsageError(format("‘%1%’ requires a float argument") % opt);
return n * multiplier;
}
/* Show the manual page for the specified program. */
void showManPage(const string & name);

8
src/libutil/util.hh
View file

@ -358,6 +358,14 @@ template<class N> bool string2Int(const string & s, N & n)
return str && str.get() == EOF;
}
/* Parse a string into a float. */
template<class N> bool string2Float(const string & s, N & n)
{
std::istringstream str(s);
str >> n;
return str && str.get() == EOF;
}
/* Return true iff `s' ends in `suffix'. */
bool hasSuffix(const string & s, const string & suffix);

4
src/nix-env/nix-env.cc
View file

@ -1127,6 +1127,10 @@ static void opQuery(Globals & globals, Strings opFlags, Strings opArgs)
attrs2["type"] = "int";
attrs2["value"] = (format("%1%") % v->integer).str();
xml.writeEmptyElement("meta", attrs2);
} else if (v->type == tFloat) {
attrs2["type"] = "float";
attrs2["value"] = (format("%1%") % v->fpoint).str();
xml.writeEmptyElement("meta", attrs2);
} else if (v->type == tBool) {
attrs2["type"] = "bool";
attrs2["value"] = v->boolean ? "true" : "false";