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* Use SGparseString() instead of SGparseFile() because the latter is

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buggy.  It fails to clear an internal variable (SG_textIndex)
  between invocations, so it can be called only once during a program
  execution.
This commit is contained in:
Eelco Dolstra 2003-10-31 11:22:56 +00:00
parent 403cb9327f
commit 7db08cc924
1 changed files with 23 additions and 2 deletions
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25
src/fix-ng/parser.cc
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@ -2,6 +2,7 @@
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <unistd.h>
extern "C" {
@ -16,6 +17,11 @@ extern "C" {
#include "parse-table.h"
/* Cleanup cleans up an imploded parse tree into an actual abstract
syntax tree that we can evaluate. It removes quotes around
strings, converts integer literals into actual integers, and
absolutises paths relative to the directory containing the input
file. */
struct Cleanup : TermFun
{
string basePath;
@ -94,14 +100,28 @@ Expr parseExprFromFile(Path path)
initialised = true;
}
ATerm result = SGparseFile((char *) programId.c_str(), lang,
"Expr", (char *) path.c_str());
/* 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;
/* Parse it. */
ATerm result = SGparseString(lang, "Expr", text);
if (!result)
throw SysError(format("parse failed in `%1%'") % path);
if (SGisParseError(result))
throw Error(format("parse error in `%1%': %2%")
% path % printTerm(result));
/* Implode it. */
PT_ParseTree tree = PT_makeParseTreeFromTerm(result);
if (!tree)
throw Error(format("cannot create parse tree"));
@ -121,6 +141,7 @@ Expr parseExprFromFile(Path path)
if (!imploded)
throw Error(format("cannot implode parse tree"));
/* Finally, clean it up. */
Cleanup cleanup;
cleanup.basePath = dirOf(path);
return bottomupRewrite(cleanup, imploded);