search for: parse_incomplete

...the parser sees 'x' and '=' it expects an expr_or_assign and we know it will receive an expr. However, the expr cannot be a new line(according to the defn of expr) So instead of an expr, the parse gets a newline and should fail. Q: So how does R parse this? I think it fails with a Parse_Incomplete and keeps on reading till EOF (or till an expression is complete). But this is not really an incomplete expression but if my interpretation is correct a syntax error, yet R parses it. So i understood something else or R's engine manages to do things differently Regards Saptarshi

...re are the specifics: ----------------------------------------------------------- From non-exported header file ${R_HOME}/src/include/Parse.h ----------------------------------------------------------- extern SEXP R_ParseVector(SEXP, int, int *); #define PARSE_NULL 0 #define PARSE_OK 1 #define PARSE_INCOMPLETE 2 #define PARSE_ERROR 3 #define PARSE_EOF 4 ----------------------------------------------------------- From non-exported header file ${R_HOME}/src/include/Defn.h ----------------------------------------------------------- extern void R_PreserveObject(SEXP); extern void R_ReleaseObject(SEXP);...

Hi gurus, After an unsuccessful scrabble through the documentation and Jon's excellent search facility, I am no wiser as to how R recognizes an incomplete command line and politely raises its hand for more. The help page for parse gives no indication that it does anything more than spit the dummy when fed an incomplete command line, but something in there must recognize such ellipsis.

Hi gurus, After an unsuccessful scrabble through the documentation and Jon's excellent search facility, I am no wiser as to how R recognizes an incomplete command line and politely raises its hand for more. The help page for parse gives no indication that it does anything more than spit the dummy when fed an incomplete command line, but something in there must recognize such ellipsis.

...t; CAMLparam1(s); > SEXP text ; > SEXP pr ; > ParseStatus status; > PROTECT(text = mkString(String_val(s))); > PROTECT(pr=R_ParseVector(text, 1, &status, R_NilValue)); > UNPROTECT(2); > switch (status) { > case PARSE_OK: > break; > case PARSE_INCOMPLETE: > case PARSE_EOF: > caml_raise_with_string(*caml_named_value("Parse_incomplete"), (String_val(s))); > case PARSE_NULL: > case PARSE_ERROR: > caml_raise_with_string(*caml_named_value("Parse_error"), (String_val(s))); > } > CAM...

Hi, I'm trying to write some Python code to check if a string text contains a complete R statement. I'm hoping someone will be able to point me to the right place in the R source code, so I can use it as a starting point. For example, In the R console. > x <- 1 > plot( + x + + ) > If I type "plot(", the console adds a "+" until the ")"

...o comparatively easy, without the need to embed a rudimentary top-down parser within the lexical analyser, as was done in the Bison parser. The old read-eval-print loop operates by calling the parser repeatedly with one line of input, two lines of input, etc. until it gets a return code other than PARSE_INCOMPLETE. This results in the time taken growing as the square of the number of source lines. The new read-eval-print loop simply provides the parser with a character input routine that reads new lines as required, while the parser avoids looking at a character until really needed, to avoid spurious reque...

...acks) { Rf_callToplevelHandlers(R_CurrentExpr, value, TRUE, wasDisplayed); } R_CurrentExpr = value; UNPROTECT(1); R_IoBufferWriteReset(&R_ConsoleIob); R_Busy(0); return value; case PARSE_ERROR: parseError(R_NilValue, 0); R_IoBufferWriteReset(&R_ConsoleIob); break; case PARSE_INCOMPLETE: R_IoBufferReadReset(&R_ConsoleIob); break; case PARSE_EOF: break; } return R_NilValue; } -------------- next part -------------- A non-text attachment was scrubbed... Name: not available Type: application/pgp-signature Size: 189 bytes Desc: not available Url : https://stat.ethz....

...vention = CallingConvention.Cdecl,*/ CharSet = CharSet.Ansi)] static extern void Rf_setVar(IntPtr symbol, IntPtr value, IntPtr env); #endregion #region <R.DLL interop types> enum RParseStatus { PARSE_NULL, PARSE_OK, PARSE_INCOMPLETE, PARSE_ERROR, PARSE_EOF }; enum SaType { SA_NORESTORE = 0,/* = 0 */ SA_RESTORE, SA_DEFAULT,/* was === SA_RESTORE */ SA_NOSAVE, SA_SAVE, SA_SAVEASK, SA...

...vention = CallingConvention.Cdecl,*/ CharSet = CharSet.Ansi)] static extern void Rf_setVar(IntPtr symbol, IntPtr value, IntPtr env); #endregion #region <R.DLL interop types> enum RParseStatus { PARSE_NULL, PARSE_OK, PARSE_INCOMPLETE, PARSE_ERROR, PARSE_EOF }; enum SaType { SA_NORESTORE = 0,/* = 0 */ SA_RESTORE, SA_DEFAULT,/* was === SA_RESTORE */ SA_NOSAVE, SA_SAVE, SA_SAVEASK, SA...

...ger possible to pass list variables to .C(DUP = FALSE): it would have given rise to obscure garbage collection errors. o allocString is now a macro, so packages using it will need to be reinstalled. o R_ParseVector was returning with object(s) protected in the parser if the status was PARSE_INCOMPLETE or PARSE_ERROR. o There is a new function Rf_endEmbeddedR to properly terminate a session started by Rf_initEmbeddedR, and both are now available on Windows as well as on Unix-alikes. These and related functions are declared in a new header <Rembedded.h>. If R_TempDir is set when e...

...ger possible to pass list variables to .C(DUP = FALSE): it would have given rise to obscure garbage collection errors. o allocString is now a macro, so packages using it will need to be reinstalled. o R_ParseVector was returning with object(s) protected in the parser if the status was PARSE_INCOMPLETE or PARSE_ERROR. o There is a new function Rf_endEmbeddedR to properly terminate a session started by Rf_initEmbeddedR, and both are now available on Windows as well as on Unix-alikes. These and related functions are declared in a new header <Rembedded.h>. If R_TempDir is set when e...