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* Compile the lexer as C++ code. Remove all the redundant C/C++

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marshalling code.
This commit is contained in:
Eelco Dolstra 2006-09-04 21:36:15 +00:00
parent 75068e7d75
commit e3ce954582
4 changed files with 234 additions and 276 deletions
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10
src/libexpr/Makefile.am
View file

@ -1,14 +1,14 @@
pkglib_LTLIBRARIES = libexpr.la
libexpr_la_SOURCES = nixexpr.cc nixexpr.hh parser.cc parser.hh \
libexpr_la_SOURCES = nixexpr.cc nixexpr.hh \
eval.cc eval.hh primops.cc \
lexer-tab.c lexer-tab.h parser-tab.cc parser-tab.hh \
lexer-tab.cc lexer-tab.hh parser-tab.cc parser-tab.hh \
get-drvs.cc get-drvs.hh \
attr-path.cc attr-path.hh \
expr-to-xml.cc expr-to-xml.hh
BUILT_SOURCES = nixexpr-ast.cc nixexpr-ast.hh \
parser-tab.hh lexer-tab.h parser-tab.cc lexer-tab.c
parser-tab.hh lexer-tab.hh parser-tab.cc lexer-tab.cc
EXTRA_DIST = lexer.l parser.y nixexpr-ast.def nixexpr-ast.cc
@ -24,8 +24,8 @@ AM_CFLAGS = \
parser-tab.cc parser-tab.hh: parser.y
$(bison) -v -o parser-tab.cc $(srcdir)/parser.y -d
lexer-tab.c lexer-tab.h: lexer.l
$(flex) --outfile lexer-tab.c --header-file=lexer-tab.h $(srcdir)/lexer.l
lexer-tab.cc lexer-tab.hh: lexer.l
$(flex) --outfile lexer-tab.cc --header-file=lexer-tab.hh $(srcdir)/lexer.l
# ATerm helper function generation.

44
src/libexpr/lexer.l
View file

@ -7,16 +7,23 @@
%{
#include <string.h>
#include <aterm2.h>
#include "aterm.hh"
#include "nixexpr.hh"
#include "nixexpr-ast.hh"
#include "parser-tab.hh"
using namespace nix;
namespace nix {
static void initLoc(YYLTYPE * loc)
{
loc->first_line = 1;
loc->first_column = 1;
}
static void adjustLoc(YYLTYPE * loc, const char * s, size_t len)
{
while (len--) {
@ -35,12 +42,32 @@ static void adjustLoc(YYLTYPE * loc, const char * s, size_t len)
}
}
ATerm toATerm(const char * s)
static Expr unescapeStr(const char * s)
{
return (ATerm) ATmakeAppl0(ATmakeAFun((char *) s, 0, ATtrue));
string t;
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 makeStr(toATerm(t));
}
ATerm unescapeStr(const char * s);
}
#define YY_USER_INIT initLoc(yylloc)
#define YY_USER_ACTION adjustLoc(yylloc, yytext, yyleng);
@ -106,12 +133,17 @@ inherit { return INHERIT; }
%%
namespace nix {
/* Horrible, disgusting hack: allow the parser to set the scanner
start condition back to STRING. Necessary in interpolations like
"foo${expr}bar"; after the close brace we have to go back to the
STRING state. */
void backToString(yyscan_t scanner)
{
struct yyguts_t * yyg = (struct yyguts_t*) scanner;
struct yyguts_t * yyg = (struct yyguts_t *) scanner;
BEGIN(STRING);
}
}

244
src/libexpr/parser.cc
View file

@ -1,244 +0,0 @@
#include "parser.hh"
#include "aterm.hh"
#include "util.hh"
#include "nixexpr-ast.hh"
#include <sstream>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <unistd.h>
extern "C" {
#include "parser-tab.hh"
#include "lexer-tab.h"
}
namespace nix {
struct ParseData
{
Expr result;
Path basePath;
Path path;
string error;
};
}
int yyparse(yyscan_t scanner, nix::ParseData * data);
namespace nix {
void setParseResult(ParseData * data, ATerm t)
{
data->result = t;
}
ATerm absParsedPath(ParseData * data, ATerm t)
{
return toATerm(absPath(aterm2String(t), data->basePath));
}
void parseError(ParseData * data, char * error, int line, int column)
{
data->error = (format("%1%, at `%2%':%3%:%4%")
% error % data->path % line % column).str();
}
ATerm fixAttrs(int recursive, ATermList as)
{
ATermList bs = ATempty, cs = ATempty;
ATermList * is = recursive ? &cs : &bs;
for (ATermIterator i(as); i; ++i) {
ATermList names;
Expr src;
ATerm pos;
if (matchInherit(*i, src, names, pos)) {
bool fromScope = matchScope(src);
for (ATermIterator j(names); j; ++j) {
Expr rhs = fromScope ? makeVar(*j) : makeSelect(src, *j);
*is = ATinsert(*is, makeBind(*j, rhs, pos));
}
} else bs = ATinsert(bs, *i);
}
if (recursive)
return makeRec(bs, cs);
else
return makeAttrs(bs);
}
const char * getPath(ParseData * data)
{
return data->path.c_str();
}
extern "C" {
Expr unescapeStr(const char * s)
{
string t;
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 makeStr(toATerm(t));
}
}
static void checkAttrs(ATermMap & names, ATermList bnds)
{
for (ATermIterator i(bnds); i; ++i) {
ATerm name;
Expr e;
ATerm pos;
if (!matchBind(*i, name, e, pos)) abort(); /* can't happen */
if (names.get(name))
throw EvalError(format("duplicate attribute `%1%' at %2%")
% aterm2String(name) % showPos(pos));
names.set(name, name);
}
}
static void checkAttrSets(ATerm e)
{
ATermList formals;
ATerm body, pos;
if (matchFunction(e, formals, body, pos)) {
ATermMap names(ATgetLength(formals));
for (ATermIterator i(formals); i; ++i) {
ATerm name;
ATerm d1, d2;
if (!matchFormal(*i, name, d1, d2)) abort();
if (names.get(name))
throw EvalError(format("duplicate formal function argument `%1%' at %2%")
% aterm2String(name) % showPos(pos));
names.set(name, name);
}
}
ATermList bnds;
if (matchAttrs(e, bnds)) {
ATermMap names(ATgetLength(bnds));
checkAttrs(names, bnds);
}
ATermList rbnds, nrbnds;
if (matchRec(e, rbnds, nrbnds)) {
ATermMap names(ATgetLength(rbnds) + ATgetLength(nrbnds));
checkAttrs(names, rbnds);
checkAttrs(names, nrbnds);
}
if (ATgetType(e) == AT_APPL) {
int arity = ATgetArity(ATgetAFun(e));
for (int i = 0; i < arity; ++i)
checkAttrSets(ATgetArgument(e, i));
}
else if (ATgetType(e) == AT_LIST)
for (ATermIterator i((ATermList) e); i; ++i)
checkAttrSets(*i);
}
static Expr parse(EvalState & state,
const char * text, const Path & path,
const Path & basePath)
{
yyscan_t scanner;
ParseData data;
data.basePath = basePath;
data.path = path;
yylex_init(&scanner);
yy_scan_string(text, scanner);
int res = yyparse(scanner, &data);
yylex_destroy(scanner);
if (res) throw EvalError(data.error);
try {
checkVarDefs(state.primOps, data.result);
} catch (Error & e) {
throw EvalError(format("%1%, in `%2%'") % e.msg() % path);
}
checkAttrSets(data.result);
return data.result;
}
Expr parseExprFromFile(EvalState & state, Path path)
{
SwitchToOriginalUser sw;
assert(path[0] == '/');
#if 0
/* Perhaps this is already an imploded parse tree? */
Expr e = ATreadFromNamedFile(path.c_str());
if (e) return e;
#endif
/* If `path' is a symlink, follow it. This is so that relative
path references work. */
struct stat st;
if (lstat(path.c_str(), &st))
throw SysError(format("getting status of `%1%'") % path);
if (S_ISLNK(st.st_mode)) path = absPath(readLink(path), dirOf(path));
/* If `path' refers to a directory, append `/default.nix'. */
if (stat(path.c_str(), &st))
throw SysError(format("getting status of `%1%'") % path);
if (S_ISDIR(st.st_mode))
path = canonPath(path + "/default.nix");
/* Read the input file. We can't use SGparseFile() because it's
broken, so we read the input ourselves and call
SGparseString(). */
AutoCloseFD fd = open(path.c_str(), O_RDONLY);
if (fd == -1) throw SysError(format("opening `%1%'") % path);
if (fstat(fd, &st) == -1)
throw SysError(format("statting `%1%'") % path);
char text[st.st_size + 1];
readFull(fd, (unsigned char *) text, st.st_size);
text[st.st_size] = 0;
return parse(state, text, path, dirOf(path));
}
Expr parseExprFromString(EvalState & state,
const string & s, const Path & basePath)
{
return parse(state, s.c_str(), "(string)", basePath);
}
}

212
src/libexpr/parser.y
View file

@ -6,6 +6,7 @@
%parse-param { ParseData * data }
%lex-param { yyscan_t scanner }
%{
#include <stdio.h>
#include <stdlib.h>
@ -13,19 +14,21 @@
#include <aterm2.h>
#include "parser-tab.hh"
extern "C" {
#include "lexer-tab.h"
}
#include "lexer-tab.hh"
#include "aterm.hh"
#include "util.hh"
#include "nixexpr.hh"
#include "nixexpr-ast.hh"
using namespace nix;
namespace nix {
struct ParseData
{
Expr result;
@ -34,33 +37,52 @@ struct ParseData
string error;
};
void setParseResult(ParseData * data, ATerm t);
void parseError(ParseData * data, char * error, int line, int column);
ATerm absParsedPath(ParseData * data, ATerm t);
ATerm fixAttrs(int recursive, ATermList as);
const char * getPath(ParseData * data);
Expr unescapeStr(const char * s);
extern "C" {
void backToString(yyscan_t scanner);
}
}
void yyerror(YYLTYPE * loc, yyscan_t scanner, ParseData * data, char * s)
static ATerm fixAttrs(int recursive, ATermList as)
{
parseError(data, s, loc->first_line, loc->first_column);
ATermList bs = ATempty, cs = ATempty;
ATermList * is = recursive ? &cs : &bs;
for (ATermIterator i(as); i; ++i) {
ATermList names;
Expr src;
ATerm pos;
if (matchInherit(*i, src, names, pos)) {
bool fromScope = matchScope(src);
for (ATermIterator j(names); j; ++j) {
Expr rhs = fromScope ? makeVar(*j) : makeSelect(src, *j);
*is = ATinsert(*is, makeBind(*j, rhs, pos));
}
} else bs = ATinsert(bs, *i);
}
if (recursive)
return makeRec(bs, cs);
else
return makeAttrs(bs);
}
void backToString(yyscan_t scanner);
static Pos makeCurPos(YYLTYPE * loc, ParseData * data)
{
return makePos(toATerm(getPath(data)),
return makePos(toATerm(data->path),
loc->first_line, loc->first_column);
}
#define CUR_POS makeCurPos(yylocp, data)
}
void yyerror(YYLTYPE * loc, yyscan_t scanner, ParseData * data, char * error)
{
data->error = (format("%1%, at `%2%':%3%:%4%")
% error % data->path % loc->first_line % loc->first_column).str();
}
/* Make sure that the parse stack is scanned by the ATerm garbage
collector. */
static void * mallocAndProtect(size_t size)
@ -107,7 +129,7 @@ static void freeAndUnprotect(void * p)
%%
start: expr { setParseResult(data, $1); };
start: expr { data->result = $1; };
expr: expr_function;
@ -165,7 +187,7 @@ expr_simple
else if (ATgetNext($2) == ATempty) $$ = ATgetFirst($2);
else $$ = makeConcatStrings(ATreverse($2));
}
| PATH { $$ = makePath(absParsedPath(data, $1)); }
| PATH { $$ = makePath(toATerm(absPath(aterm2String($1), data->basePath))); }
| URI { $$ = makeUri($1); }
| '(' expr ')' { $$ = $2; }
/* Let expressions `let {..., body = ...}' are just desugared
@ -224,3 +246,151 @@ formal
;
%%
#include "eval.hh"
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <unistd.h>
namespace nix {
static void checkAttrs(ATermMap & names, ATermList bnds)
{
for (ATermIterator i(bnds); i; ++i) {
ATerm name;
Expr e;
ATerm pos;
if (!matchBind(*i, name, e, pos)) abort(); /* can't happen */
if (names.get(name))
throw EvalError(format("duplicate attribute `%1%' at %2%")
% aterm2String(name) % showPos(pos));
names.set(name, name);
}
}
static void checkAttrSets(ATerm e)
{
ATermList formals;
ATerm body, pos;
if (matchFunction(e, formals, body, pos)) {
ATermMap names(ATgetLength(formals));
for (ATermIterator i(formals); i; ++i) {
ATerm name;
ATerm d1, d2;
if (!matchFormal(*i, name, d1, d2)) abort();
if (names.get(name))
throw EvalError(format("duplicate formal function argument `%1%' at %2%")
% aterm2String(name) % showPos(pos));
names.set(name, name);
}
}
ATermList bnds;
if (matchAttrs(e, bnds)) {
ATermMap names(ATgetLength(bnds));
checkAttrs(names, bnds);
}
ATermList rbnds, nrbnds;
if (matchRec(e, rbnds, nrbnds)) {
ATermMap names(ATgetLength(rbnds) + ATgetLength(nrbnds));
checkAttrs(names, rbnds);
checkAttrs(names, nrbnds);
}
if (ATgetType(e) == AT_APPL) {
int arity = ATgetArity(ATgetAFun(e));
for (int i = 0; i < arity; ++i)
checkAttrSets(ATgetArgument(e, i));
}
else if (ATgetType(e) == AT_LIST)
for (ATermIterator i((ATermList) e); i; ++i)
checkAttrSets(*i);
}
static Expr parse(EvalState & state,
const char * text, const Path & path,
const Path & basePath)
{
yyscan_t scanner;
ParseData data;
data.basePath = basePath;
data.path = path;
yylex_init(&scanner);
yy_scan_string(text, scanner);
int res = yyparse(scanner, &data);
yylex_destroy(scanner);
if (res) throw EvalError(data.error);
try {
checkVarDefs(state.primOps, data.result);
} catch (Error & e) {
throw EvalError(format("%1%, in `%2%'") % e.msg() % path);
}
checkAttrSets(data.result);
return data.result;
}
Expr parseExprFromFile(EvalState & state, Path path)
{
SwitchToOriginalUser sw;
assert(path[0] == '/');
#if 0
/* Perhaps this is already an imploded parse tree? */
Expr e = ATreadFromNamedFile(path.c_str());
if (e) return e;
#endif
/* If `path' is a symlink, follow it. This is so that relative
path references work. */
struct stat st;
if (lstat(path.c_str(), &st))
throw SysError(format("getting status of `%1%'") % path);
if (S_ISLNK(st.st_mode)) path = absPath(readLink(path), dirOf(path));
/* If `path' refers to a directory, append `/default.nix'. */
if (stat(path.c_str(), &st))
throw SysError(format("getting status of `%1%'") % path);
if (S_ISDIR(st.st_mode))
path = canonPath(path + "/default.nix");
/* Read the input file. We can't use SGparseFile() because it's
broken, so we read the input ourselves and call
SGparseString(). */
AutoCloseFD fd = open(path.c_str(), O_RDONLY);
if (fd == -1) throw SysError(format("opening `%1%'") % path);
if (fstat(fd, &st) == -1)
throw SysError(format("statting `%1%'") % path);
char text[st.st_size + 1];
readFull(fd, (unsigned char *) text, st.st_size);
text[st.st_size] = 0;
return parse(state, text, path, dirOf(path));
}
Expr parseExprFromString(EvalState & state,
const string & s, const Path & basePath)
{
return parse(state, s.c_str(), "(string)", basePath);
}
}