* Compile the lexer as C++ code. Remove all the redundant C/C++
marshalling code.
This commit is contained in:
Eelco Dolstra
parent
75068e7d75
commit
e3ce954582
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@ -1,14 +1,14 @@
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pkglib_LTLIBRARIES = libexpr.la
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libexpr_la_SOURCES = nixexpr.cc nixexpr.hh parser.cc parser.hh \
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libexpr_la_SOURCES = nixexpr.cc nixexpr.hh \
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eval.cc eval.hh primops.cc \
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lexer-tab.c lexer-tab.h parser-tab.cc parser-tab.hh \
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lexer-tab.cc lexer-tab.hh parser-tab.cc parser-tab.hh \
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get-drvs.cc get-drvs.hh \
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attr-path.cc attr-path.hh \
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expr-to-xml.cc expr-to-xml.hh
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BUILT_SOURCES = nixexpr-ast.cc nixexpr-ast.hh \
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parser-tab.hh lexer-tab.h parser-tab.cc lexer-tab.c
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parser-tab.hh lexer-tab.hh parser-tab.cc lexer-tab.cc
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EXTRA_DIST = lexer.l parser.y nixexpr-ast.def nixexpr-ast.cc
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@ -24,8 +24,8 @@ AM_CFLAGS = \
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parser-tab.cc parser-tab.hh: parser.y
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$(bison) -v -o parser-tab.cc $(srcdir)/parser.y -d
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lexer-tab.c lexer-tab.h: lexer.l
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$(flex) --outfile lexer-tab.c --header-file=lexer-tab.h $(srcdir)/lexer.l
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lexer-tab.cc lexer-tab.hh: lexer.l
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$(flex) --outfile lexer-tab.cc --header-file=lexer-tab.hh $(srcdir)/lexer.l
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# ATerm helper function generation.
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@ -7,16 +7,23 @@
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%{
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#include <string.h>
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#include <aterm2.h>
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#include "aterm.hh"
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#include "nixexpr.hh"
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#include "nixexpr-ast.hh"
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#include "parser-tab.hh"
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using namespace nix;
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namespace nix {
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static void initLoc(YYLTYPE * loc)
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{
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loc->first_line = 1;
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loc->first_column = 1;
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}
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static void adjustLoc(YYLTYPE * loc, const char * s, size_t len)
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{
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while (len--) {
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@ -35,12 +42,32 @@ static void adjustLoc(YYLTYPE * loc, const char * s, size_t len)
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}
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}
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ATerm toATerm(const char * s)
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static Expr unescapeStr(const char * s)
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{
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return (ATerm) ATmakeAppl0(ATmakeAFun((char *) s, 0, ATtrue));
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string t;
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char c;
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while ((c = *s++)) {
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if (c == '\\') {
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assert(*s);
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c = *s++;
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if (c == 'n') t += '\n';
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else if (c == 'r') t += '\r';
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else if (c == 't') t += '\t';
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else t += c;
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}
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else if (c == '\r') {
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/* Normalise CR and CR/LF into LF. */
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t += '\n';
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if (*s == '\n') s++; /* cr/lf */
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}
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else t += c;
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}
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return makeStr(toATerm(t));
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}
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ATerm unescapeStr(const char * s);
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}
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#define YY_USER_INIT initLoc(yylloc)
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#define YY_USER_ACTION adjustLoc(yylloc, yytext, yyleng);
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@ -106,6 +133,9 @@ inherit { return INHERIT; }
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%%
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namespace nix {
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/* Horrible, disgusting hack: allow the parser to set the scanner
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start condition back to STRING. Necessary in interpolations like
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"foo${expr}bar"; after the close brace we have to go back to the
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@ -115,3 +145,5 @@ void backToString(yyscan_t scanner)
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struct yyguts_t * yyg = (struct yyguts_t *) scanner;
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BEGIN(STRING);
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}
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}
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@ -1,244 +0,0 @@
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#include "parser.hh"
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#include "aterm.hh"
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#include "util.hh"
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#include "nixexpr-ast.hh"
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#include <sstream>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <fcntl.h>
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#include <unistd.h>
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extern "C" {
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#include "parser-tab.hh"
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#include "lexer-tab.h"
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}
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namespace nix {
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struct ParseData
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{
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Expr result;
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Path basePath;
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Path path;
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string error;
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};
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}
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int yyparse(yyscan_t scanner, nix::ParseData * data);
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namespace nix {
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void setParseResult(ParseData * data, ATerm t)
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{
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data->result = t;
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}
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ATerm absParsedPath(ParseData * data, ATerm t)
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{
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return toATerm(absPath(aterm2String(t), data->basePath));
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}
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void parseError(ParseData * data, char * error, int line, int column)
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{
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data->error = (format("%1%, at `%2%':%3%:%4%")
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% error % data->path % line % column).str();
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}
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ATerm fixAttrs(int recursive, ATermList as)
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{
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ATermList bs = ATempty, cs = ATempty;
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ATermList * is = recursive ? &cs : &bs;
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for (ATermIterator i(as); i; ++i) {
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ATermList names;
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Expr src;
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ATerm pos;
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if (matchInherit(*i, src, names, pos)) {
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bool fromScope = matchScope(src);
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for (ATermIterator j(names); j; ++j) {
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Expr rhs = fromScope ? makeVar(*j) : makeSelect(src, *j);
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*is = ATinsert(*is, makeBind(*j, rhs, pos));
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}
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} else bs = ATinsert(bs, *i);
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}
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if (recursive)
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return makeRec(bs, cs);
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else
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return makeAttrs(bs);
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}
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const char * getPath(ParseData * data)
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{
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return data->path.c_str();
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}
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extern "C" {
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Expr unescapeStr(const char * s)
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{
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string t;
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char c;
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while ((c = *s++)) {
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if (c == '\\') {
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assert(*s);
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c = *s++;
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if (c == 'n') t += '\n';
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else if (c == 'r') t += '\r';
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else if (c == 't') t += '\t';
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else t += c;
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}
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else if (c == '\r') {
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/* Normalise CR and CR/LF into LF. */
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t += '\n';
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if (*s == '\n') s++; /* cr/lf */
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}
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else t += c;
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}
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return makeStr(toATerm(t));
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}
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}
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static void checkAttrs(ATermMap & names, ATermList bnds)
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{
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for (ATermIterator i(bnds); i; ++i) {
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ATerm name;
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Expr e;
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ATerm pos;
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if (!matchBind(*i, name, e, pos)) abort(); /* can't happen */
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if (names.get(name))
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throw EvalError(format("duplicate attribute `%1%' at %2%")
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% aterm2String(name) % showPos(pos));
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names.set(name, name);
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}
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}
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static void checkAttrSets(ATerm e)
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{
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ATermList formals;
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ATerm body, pos;
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if (matchFunction(e, formals, body, pos)) {
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ATermMap names(ATgetLength(formals));
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for (ATermIterator i(formals); i; ++i) {
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ATerm name;
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ATerm d1, d2;
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if (!matchFormal(*i, name, d1, d2)) abort();
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if (names.get(name))
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throw EvalError(format("duplicate formal function argument `%1%' at %2%")
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% aterm2String(name) % showPos(pos));
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names.set(name, name);
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}
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}
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ATermList bnds;
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if (matchAttrs(e, bnds)) {
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ATermMap names(ATgetLength(bnds));
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checkAttrs(names, bnds);
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}
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ATermList rbnds, nrbnds;
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if (matchRec(e, rbnds, nrbnds)) {
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ATermMap names(ATgetLength(rbnds) + ATgetLength(nrbnds));
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checkAttrs(names, rbnds);
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checkAttrs(names, nrbnds);
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}
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if (ATgetType(e) == AT_APPL) {
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int arity = ATgetArity(ATgetAFun(e));
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for (int i = 0; i < arity; ++i)
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checkAttrSets(ATgetArgument(e, i));
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}
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else if (ATgetType(e) == AT_LIST)
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for (ATermIterator i((ATermList) e); i; ++i)
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checkAttrSets(*i);
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}
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static Expr parse(EvalState & state,
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const char * text, const Path & path,
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const Path & basePath)
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{
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yyscan_t scanner;
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ParseData data;
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data.basePath = basePath;
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data.path = path;
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yylex_init(&scanner);
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yy_scan_string(text, scanner);
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int res = yyparse(scanner, &data);
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yylex_destroy(scanner);
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if (res) throw EvalError(data.error);
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try {
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checkVarDefs(state.primOps, data.result);
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} catch (Error & e) {
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throw EvalError(format("%1%, in `%2%'") % e.msg() % path);
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}
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checkAttrSets(data.result);
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return data.result;
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}
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Expr parseExprFromFile(EvalState & state, Path path)
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{
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SwitchToOriginalUser sw;
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assert(path[0] == '/');
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#if 0
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/* Perhaps this is already an imploded parse tree? */
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Expr e = ATreadFromNamedFile(path.c_str());
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if (e) return e;
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#endif
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/* If `path' is a symlink, follow it. This is so that relative
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path references work. */
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struct stat st;
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if (lstat(path.c_str(), &st))
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throw SysError(format("getting status of `%1%'") % path);
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if (S_ISLNK(st.st_mode)) path = absPath(readLink(path), dirOf(path));
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/* If `path' refers to a directory, append `/default.nix'. */
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if (stat(path.c_str(), &st))
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throw SysError(format("getting status of `%1%'") % path);
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if (S_ISDIR(st.st_mode))
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path = canonPath(path + "/default.nix");
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/* Read the input file. We can't use SGparseFile() because it's
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broken, so we read the input ourselves and call
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SGparseString(). */
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AutoCloseFD fd = open(path.c_str(), O_RDONLY);
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if (fd == -1) throw SysError(format("opening `%1%'") % path);
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if (fstat(fd, &st) == -1)
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throw SysError(format("statting `%1%'") % path);
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char text[st.st_size + 1];
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readFull(fd, (unsigned char *) text, st.st_size);
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text[st.st_size] = 0;
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return parse(state, text, path, dirOf(path));
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}
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Expr parseExprFromString(EvalState & state,
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const string & s, const Path & basePath)
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{
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return parse(state, s.c_str(), "(string)", basePath);
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}
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}
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@ -6,6 +6,7 @@
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%parse-param { ParseData * data }
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%lex-param { yyscan_t scanner }
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%{
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#include <stdio.h>
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#include <stdlib.h>
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@ -13,19 +14,21 @@
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#include <aterm2.h>
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#include "parser-tab.hh"
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extern "C" {
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#include "lexer-tab.h"
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}
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#include "lexer-tab.hh"
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#include "aterm.hh"
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#include "util.hh"
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#include "nixexpr.hh"
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#include "nixexpr-ast.hh"
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using namespace nix;
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namespace nix {
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struct ParseData
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{
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Expr result;
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@ -34,33 +37,52 @@ struct ParseData
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string error;
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};
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void setParseResult(ParseData * data, ATerm t);
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void parseError(ParseData * data, char * error, int line, int column);
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ATerm absParsedPath(ParseData * data, ATerm t);
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ATerm fixAttrs(int recursive, ATermList as);
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const char * getPath(ParseData * data);
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Expr unescapeStr(const char * s);
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extern "C" {
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void backToString(yyscan_t scanner);
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}
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}
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void yyerror(YYLTYPE * loc, yyscan_t scanner, ParseData * data, char * s)
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static ATerm fixAttrs(int recursive, ATermList as)
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{
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parseError(data, s, loc->first_line, loc->first_column);
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ATermList bs = ATempty, cs = ATempty;
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ATermList * is = recursive ? &cs : &bs;
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for (ATermIterator i(as); i; ++i) {
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ATermList names;
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Expr src;
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ATerm pos;
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if (matchInherit(*i, src, names, pos)) {
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bool fromScope = matchScope(src);
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for (ATermIterator j(names); j; ++j) {
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Expr rhs = fromScope ? makeVar(*j) : makeSelect(src, *j);
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*is = ATinsert(*is, makeBind(*j, rhs, pos));
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}
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} else bs = ATinsert(bs, *i);
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}
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if (recursive)
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return makeRec(bs, cs);
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else
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return makeAttrs(bs);
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}
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void backToString(yyscan_t scanner);
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static Pos makeCurPos(YYLTYPE * loc, ParseData * data)
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{
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return makePos(toATerm(getPath(data)),
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return makePos(toATerm(data->path),
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loc->first_line, loc->first_column);
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}
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#define CUR_POS makeCurPos(yylocp, data)
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}
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void yyerror(YYLTYPE * loc, yyscan_t scanner, ParseData * data, char * error)
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{
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data->error = (format("%1%, at `%2%':%3%:%4%")
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% error % data->path % loc->first_line % loc->first_column).str();
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}
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/* Make sure that the parse stack is scanned by the ATerm garbage
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collector. */
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static void * mallocAndProtect(size_t size)
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@ -107,7 +129,7 @@ static void freeAndUnprotect(void * p)
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%%
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start: expr { setParseResult(data, $1); };
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start: expr { data->result = $1; };
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expr: expr_function;
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@ -165,7 +187,7 @@ expr_simple
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else if (ATgetNext($2) == ATempty) $$ = ATgetFirst($2);
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else $$ = makeConcatStrings(ATreverse($2));
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}
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| PATH { $$ = makePath(absParsedPath(data, $1)); }
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| PATH { $$ = makePath(toATerm(absPath(aterm2String($1), data->basePath))); }
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| URI { $$ = makeUri($1); }
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| '(' expr ')' { $$ = $2; }
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/* Let expressions `let {..., body = ...}' are just desugared
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@ -224,3 +246,151 @@ formal
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;
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%%
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#include "eval.hh"
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <fcntl.h>
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#include <unistd.h>
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namespace nix {
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static void checkAttrs(ATermMap & names, ATermList bnds)
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{
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for (ATermIterator i(bnds); i; ++i) {
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ATerm name;
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Expr e;
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ATerm pos;
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if (!matchBind(*i, name, e, pos)) abort(); /* can't happen */
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if (names.get(name))
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throw EvalError(format("duplicate attribute `%1%' at %2%")
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% aterm2String(name) % showPos(pos));
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names.set(name, name);
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}
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}
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static void checkAttrSets(ATerm e)
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{
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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);
|
||||
}
|
||||
|
||||
|
||||
}
|
||||
|
|
|
|||
Loading…
Reference in a new issue