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authorBram Moolenaar <Bram@vim.org>2004-06-13 20:20:40 +0000
committerBram Moolenaar <Bram@vim.org>2004-06-13 20:20:40 +0000
commit071d4279d6ab81b7187b48f3a0fc61e587b6db6c (patch)
tree221cbe3c40e043163c06f61c52a7ba2eb41e12ce /src/ex_eval.c
parentb4210b3bc14e2918f153a7307530fbe6eba659e1 (diff)
downloadvim-git-071d4279d6ab81b7187b48f3a0fc61e587b6db6c.tar.gz
updated for version 7.0001v7.0001
Diffstat (limited to 'src/ex_eval.c')
-rw-r--r--src/ex_eval.c2004
1 files changed, 2004 insertions, 0 deletions
diff --git a/src/ex_eval.c b/src/ex_eval.c
new file mode 100644
index 000000000..921d60867
--- /dev/null
+++ b/src/ex_eval.c
@@ -0,0 +1,2004 @@
+/* vi:set ts=8 sts=4 sw=4:
+ *
+ * VIM - Vi IMproved by Bram Moolenaar
+ *
+ * Do ":help uganda" in Vim to read copying and usage conditions.
+ * Do ":help credits" in Vim to see a list of people who contributed.
+ * See README.txt for an overview of the Vim source code.
+ */
+
+/*
+ * ex_eval.c: functions for Ex command line for the +eval feature.
+ */
+
+#include "vim.h"
+
+#if defined(FEAT_EVAL) || defined(PROTO)
+
+static void free_msglist __ARGS((struct msglist *l));
+static int throw_exception __ARGS((void *, int, char_u *));
+static void rewind_conditionals __ARGS((struct condstack *,
+ int, int, int *));
+
+/*
+ * Exception handling terms:
+ *
+ * :try ":try" command \
+ * ... try block |
+ * :catch RE ":catch" command |
+ * ... catch clause |- try conditional
+ * :finally ":finally" command |
+ * ... finally clause |
+ * :endtry ":endtry" command /
+ *
+ * The try conditional may have any number of catch clauses and at most one
+ * finally clause. A ":throw" command can be inside the try block, a catch
+ * clause, the finally clause, or in a function called or script sourced from
+ * there or even outside the try conditional. Try conditionals may be nested.
+ */
+
+/*
+ * Configuration whether an exception is thrown on error or interrupt. When
+ * the preprocessor macros below evaluate to FALSE, an error (did_emsg) or
+ * interrupt (got_int) under an active try conditional terminates the script
+ * after the non-active finally clauses of all active try conditionals have been
+ * executed. Otherwise, errors and/or interrupts are converted into catchable
+ * exceptions (did_throw additionally set), which terminate the script only if
+ * not caught. For user exceptions, only did_throw is set. (Note: got_int can
+ * be set asyncronously afterwards by a SIGINT, so did_throw && got_int is not
+ * a reliant test that the exception currently being thrown is an interrupt
+ * exception. Similarly, did_emsg can be set afterwards on an error in an
+ * (unskipped) conditional command inside an inactive conditional, so did_throw
+ * && did_emsg is not a reliant test that the exception currently being thrown
+ * is an error exception.) - The macros can be defined as expressions checking
+ * for a variable that is allowed to be changed during execution of a script.
+ */
+#if 0
+/* Expressions used for testing during the development phase. */
+# define THROW_ON_ERROR (!eval_to_number("$VIMNOERRTHROW"))
+# define THROW_ON_INTERRUPT (!eval_to_number("$VIMNOINTTHROW"))
+# define THROW_TEST
+#else
+/* Values used for the Vim release. */
+# define THROW_ON_ERROR TRUE
+# define THROW_ON_INTERRUPT TRUE
+#endif
+
+static void catch_exception __ARGS((except_T *excp));
+static void finish_exception __ARGS((except_T *excp));
+static void discard_exception __ARGS((except_T *excp, int was_finished));
+static void report_pending __ARGS((int action, int pending, void *value));
+
+/*
+ * When several errors appear in a row, setting "force_abort" is delayed until
+ * the failing command returned. "cause_abort" is set to TRUE meanwhile, in
+ * order to indicate that situation. This is useful when "force_abort" was set
+ * during execution of a function call from an expression: the aborting of the
+ * expression evaluation is done without producing any error messages, but all
+ * error messages on parsing errors during the expression evaluation are given
+ * (even if a try conditional is active).
+ */
+static int cause_abort = FALSE;
+
+/*
+ * Return TRUE when immdediately aborting on error, or when an interrupt
+ * occurred or an exception was thrown but not caught. Use for ":{range}call"
+ * to check whether an aborted function that does not handle a range itself
+ * should be called again for the next line in the range. Also used for
+ * cancelling expression evaluation after a function call caused an immediate
+ * abort. Note that the first emsg() call temporarily resets "force_abort"
+ * until the throw point for error messages has been reached. That is, during
+ * cancellation of an expression evaluation after an aborting function call or
+ * due to a parsing error, aborting() always returns the same value.
+ */
+ int
+aborting()
+{
+ return (did_emsg && force_abort) || got_int || did_throw;
+}
+
+/*
+ * The value of "force_abort" is temporarily reset by the first emsg() call
+ * during an expression evaluation, and "cause_abort" is used instead. It might
+ * be necessary to restore "force_abort" even before the throw point for the
+ * error message has been reached. update_force_abort() should be called then.
+ */
+ void
+update_force_abort()
+{
+ if (cause_abort)
+ force_abort = TRUE;
+}
+
+/*
+ * Return TRUE if a command with a subcommand resulting in "retcode" should
+ * abort the script processing. Can be used to suppress an autocommand after
+ * execution of a failing subcommand as long as the error message has not been
+ * displayed and actually caused the abortion.
+ */
+ int
+should_abort(retcode)
+ int retcode;
+{
+ return ((retcode == FAIL && trylevel != 0 && !emsg_silent) || aborting());
+}
+
+/*
+ * Return TRUE if a function with the "abort" flag should not be considered
+ * ended on an error. This means that parsing commands is continued in order
+ * to find finally clauses to be executed, and that some errors in skipped
+ * commands are still reported.
+ */
+ int
+aborted_in_try()
+{
+ /* This function is only called after an error. In this case, "force_abort"
+ * determines whether searching for finally clauses is necessary. */
+ return force_abort;
+}
+
+/*
+ * cause_errthrow(): Cause a throw of an error exception if appropriate.
+ * Return TRUE if the error message should not be displayed by emsg().
+ * Sets "ignore", if the emsg() call should be ignored completely.
+ *
+ * When several messages appear in the same command, the first is usually the
+ * most specific one and used as the exception value. The "severe" flag can be
+ * set to TRUE, if a later but severer message should be used instead.
+ */
+ int
+cause_errthrow(mesg, severe, ignore)
+ char_u *mesg;
+ int severe;
+ int *ignore;
+{
+ struct msglist *elem;
+ struct msglist **plist;
+
+ /*
+ * Do nothing when displaying the interrupt message or reporting an uncaught
+ * exception (which has already been discarded then) at the top level. Also
+ * when no exception can be thrown. The message will be displayed by
+ * emsg().
+ */
+ if (suppress_errthrow)
+ return FALSE;
+
+ /*
+ * If emsg() has not been called previously, temporarily reset "force_abort"
+ * until the throw point for error messages has been reached. This ensures
+ * that aborting() returns the same value for all errors that appear in the
+ * same command. This means particularly that for parsing errors during
+ * expression evaluation emsg() will be called multiply, even when the
+ * expression is evaluated from a finally clause that was activated due to
+ * an aborting error, interrupt, or exception.
+ */
+ if (!did_emsg)
+ {
+ cause_abort = force_abort;
+ force_abort = FALSE;
+ }
+
+ /*
+ * If no try conditional is active and no exception is being thrown and
+ * there has not been an error in a try conditional or a throw so far, do
+ * nothing (for compatibility of non-EH scripts). The message will then be
+ * displayed by emsg(). When ":silent!" was used and we are not currently
+ * throwing an exception, do nothing. The message text will then be stored
+ * to v:errmsg by emsg() without displaying it.
+ */
+ if (((trylevel == 0 && !cause_abort) || emsg_silent) && !did_throw)
+ return FALSE;
+
+ /*
+ * Ignore an interrupt message when inside a try conditional or when an
+ * exception is being thrown or when an error in a try conditional or throw
+ * has been detected previously. This is important in order that an
+ * interrupt exception is catchable by the innermost try conditional and
+ * not replaced by an interrupt message error exception.
+ */
+ if (mesg == (char_u *)_(e_interr))
+ {
+ *ignore = TRUE;
+ return TRUE;
+ }
+
+ /*
+ * Ensure that all commands in nested function calls and sourced files
+ * are aborted immediately.
+ */
+ cause_abort = TRUE;
+
+ /*
+ * When an exception is being thrown, some commands (like conditionals) are
+ * not skipped. Errors in those commands may affect what of the subsequent
+ * commands are regarded part of catch and finally clauses. Catching the
+ * exception would then cause execution of commands not intended by the
+ * user, who wouldn't even get aware of the problem. Therefor, discard the
+ * exception currently being thrown to prevent it from being caught. Just
+ * execute finally clauses and terminate.
+ */
+ if (did_throw)
+ {
+ /* When discarding an interrupt exception, reset got_int to prevent the
+ * same interrupt being converted to an exception again and discarding
+ * the error exception we are about to throw here. */
+ if (current_exception->type == ET_INTERRUPT)
+ got_int = FALSE;
+ discard_current_exception();
+ }
+
+#ifdef THROW_TEST
+ if (!THROW_ON_ERROR)
+ {
+ /*
+ * Print error message immediately without searching for a matching
+ * catch clause; just finally clauses are executed before the script
+ * is terminated.
+ */
+ return FALSE;
+ }
+ else
+#endif
+ {
+ /*
+ * Prepare the throw of an error exception, so that everything will
+ * be aborted (except for executing finally clauses), until the error
+ * exception is caught; if still uncaught at the top level, the error
+ * message will be displayed and the script processing terminated
+ * then. - This function has no access to the conditional stack.
+ * Thus, the actual throw is made after the failing command has
+ * returned. - Throw only the first of several errors in a row, except
+ * a severe error is following.
+ */
+ if (msg_list != NULL)
+ {
+ plist = msg_list;
+ while (*plist != NULL)
+ plist = &(*plist)->next;
+
+ elem = (struct msglist *)alloc((unsigned)sizeof(struct msglist));
+ if (elem == NULL)
+ {
+ suppress_errthrow = TRUE;
+ EMSG(_(e_outofmem));
+ }
+ else
+ {
+ elem->msg = vim_strsave(mesg);
+ if (elem->msg == NULL)
+ {
+ vim_free(elem);
+ suppress_errthrow = TRUE;
+ EMSG(_(e_outofmem));
+ }
+ else
+ {
+ elem->next = NULL;
+ elem->throw_msg = NULL;
+ *plist = elem;
+ if (plist == msg_list || severe)
+ {
+ char_u *tmsg;
+
+ /* Skip the extra "Vim " prefix for message "E458". */
+ tmsg = elem->msg;
+ if (STRNCMP(tmsg, "Vim E", 5) == 0
+ && VIM_ISDIGIT(tmsg[5])
+ && VIM_ISDIGIT(tmsg[6])
+ && VIM_ISDIGIT(tmsg[7])
+ && tmsg[8] == ':'
+ && tmsg[9] == ' ')
+ (*msg_list)->throw_msg = &tmsg[4];
+ else
+ (*msg_list)->throw_msg = tmsg;
+ }
+ }
+ }
+ }
+ return TRUE;
+ }
+}
+
+/*
+ * Free a "msg_list" and the messages it contains.
+ */
+ static void
+free_msglist(l)
+ struct msglist *l;
+{
+ struct msglist *messages, *next;
+
+ messages = l;
+ while (messages != NULL)
+ {
+ next = messages->next;
+ vim_free(messages->msg);
+ vim_free(messages);
+ messages = next;
+ }
+}
+
+/*
+ * Throw the message specified in the call to cause_errthrow() above as an
+ * error exception. If cstack is NULL, postpone the throw until do_cmdline()
+ * has returned (see do_one_cmd()).
+ */
+ void
+do_errthrow(cstack, cmdname)
+ struct condstack *cstack;
+ char_u *cmdname;
+{
+ /*
+ * Ensure that all commands in nested function calls and sourced files
+ * are aborted immediately.
+ */
+ if (cause_abort)
+ {
+ cause_abort = FALSE;
+ force_abort = TRUE;
+ }
+
+ /* If no exception is to be thrown or the conversion should be done after
+ * returning to a previous invocation of do_one_cmd(), do nothing. */
+ if (*msg_list == NULL)
+ return;
+
+ if (throw_exception(*msg_list, ET_ERROR, cmdname) == FAIL)
+ free_msglist(*msg_list);
+ else
+ {
+ if (cstack != NULL)
+ do_throw(cstack);
+ else
+ need_rethrow = TRUE;
+ }
+ *msg_list = NULL;
+}
+
+/*
+ * do_intthrow(): Replace the current exception by an interrupt or interrupt
+ * exception if appropriate. Return TRUE if the current exception is discarded,
+ * FALSE otherwise.
+ */
+ int
+do_intthrow(cstack)
+ struct condstack *cstack;
+{
+ /*
+ * If no interrupt occurred or no try conditional is active and no exception
+ * is being thrown, do nothing (for compatibility of non-EH scripts).
+ */
+ if (!got_int || (trylevel == 0 && !did_throw))
+ return FALSE;
+
+#ifdef THROW_TEST /* avoid warning for condition always true */
+ if (!THROW_ON_INTERRUPT)
+ {
+ /*
+ * The interrupt aborts everything except for executing finally clauses.
+ * Discard any user or error or interrupt exception currently being
+ * thrown.
+ */
+ if (did_throw)
+ discard_current_exception();
+ }
+ else
+#endif
+ {
+ /*
+ * Throw an interrupt exception, so that everything will be aborted
+ * (except for executing finally clauses), until the interrupt exception
+ * is caught; if still uncaught at the top level, the script processing
+ * will be terminated then. - If an interrupt exception is already
+ * being thrown, do nothing.
+ *
+ */
+ if (did_throw)
+ {
+ if (current_exception->type == ET_INTERRUPT)
+ return FALSE;
+
+ /* An interrupt exception replaces any user or error exception. */
+ discard_current_exception();
+ }
+ if (throw_exception("Vim:Interrupt", ET_INTERRUPT, NULL) != FAIL)
+ do_throw(cstack);
+ }
+
+ return TRUE;
+}
+
+
+/*
+ * Throw a new exception. Return FAIL when out of memory or it was tried to
+ * throw an illegal user exception. "value" is the exception string for a user
+ * or interrupt exception, or points to a message list in case of an error
+ * exception.
+ */
+ static int
+throw_exception(value, type, cmdname)
+ void *value;
+ int type;
+ char_u *cmdname;
+{
+ except_T *excp;
+ char_u *p, *mesg, *val;
+ int cmdlen;
+
+ /*
+ * Disallow faking Interrupt or error exceptions as user exceptions. They
+ * would be treated differently from real interrupt or error exceptions when
+ * no active try block is found, see do_cmdline().
+ */
+ if (type == ET_USER)
+ {
+ if (STRNCMP((char_u *)value, "Vim", 3) == 0 &&
+ (((char_u *)value)[3] == NUL || ((char_u *)value)[3] == ':' ||
+ ((char_u *)value)[3] == '('))
+ {
+ EMSG(_("E608: Cannot :throw exceptions with 'Vim' prefix"));
+ goto fail;
+ }
+ }
+
+ excp = (except_T *)alloc((unsigned)sizeof(except_T));
+ if (excp == NULL)
+ goto nomem;
+
+ if (type == ET_ERROR)
+ {
+ /* Store the original message and prefix the exception value with
+ * "Vim:" or, if a command name is given, "Vim(cmdname):". */
+ excp->messages = (struct msglist *)value;
+ mesg = excp->messages->throw_msg;
+ if (cmdname != NULL && *cmdname != NUL)
+ {
+ cmdlen = STRLEN(cmdname);
+ excp->value = vim_strnsave((char_u *)"Vim(",
+ 4 + cmdlen + 2 + (int)STRLEN(mesg));
+ if (excp->value == NULL)
+ goto nomem;
+ STRCPY(&excp->value[4], cmdname);
+ STRCPY(&excp->value[4 + cmdlen], "):");
+ val = excp->value + 4 + cmdlen + 2;
+ }
+ else
+ {
+ excp->value = vim_strnsave((char_u *)"Vim:", 4 + (int)STRLEN(mesg));
+ if (excp->value == NULL)
+ goto nomem;
+ val = excp->value + 4;
+ }
+
+ /* msg_add_fname may have been used to prefix the message with a file
+ * name in quotes. In the exception value, put the file name in
+ * parentheses and move it to the end. */
+ for (p = mesg; ; p++)
+ {
+ if (*p == NUL
+ || (*p == 'E'
+ && VIM_ISDIGIT(p[1])
+ && (p[2] == ':'
+ || (VIM_ISDIGIT(p[2])
+ && (p[3] == ':'
+ || (VIM_ISDIGIT(p[3])
+ && p[4] == ':'))))))
+ {
+ if (*p == NUL || p == mesg) /* 'E123' missing or at beginning */
+ STRCAT(val, mesg);
+ else
+ {
+ /* '"filename" E123: message text' */
+ if (mesg[0] != '"' || p-2 < &mesg[1] ||
+ p[-2] != '"' || p[-1] != ' ')
+ /* "E123:" is part of the file name. */
+ continue;
+
+ STRCAT(val, p);
+ p[-2] = NUL;
+ sprintf((char *)(val + STRLEN(p)), " (%s)", &mesg[1]);
+ p[-2] = '"';
+ }
+ break;
+ }
+ }
+ }
+ else
+ excp->value = value;
+
+ excp->type = type;
+ excp->throw_name = vim_strsave(sourcing_name == NULL
+ ? (char_u *)"" : sourcing_name);
+ if (excp->throw_name == NULL)
+ {
+ if (type == ET_ERROR)
+ vim_free(excp->value);
+ goto nomem;
+ }
+ excp->throw_lnum = sourcing_lnum;
+
+ if (p_verbose >= 13 || debug_break_level > 0)
+ {
+ int save_msg_silent = msg_silent;
+
+ if (debug_break_level > 0)
+ msg_silent = FALSE; /* display messages */
+ ++no_wait_return;
+ msg_scroll = TRUE; /* always scroll up, don't overwrite */
+ msg_str((char_u *)_("Exception thrown: %s"), excp->value);
+ msg_puts((char_u *)"\n"); /* don't overwrite this either */
+ cmdline_row = msg_row;
+ --no_wait_return;
+ if (debug_break_level > 0)
+ msg_silent = save_msg_silent;
+ }
+
+ current_exception = excp;
+ return OK;
+
+nomem:
+ vim_free(excp);
+ suppress_errthrow = TRUE;
+ EMSG(_(e_outofmem));
+fail:
+ current_exception = NULL;
+ return FAIL;
+}
+
+/*
+ * Discard an exception. "was_finished" is set when the exception has been
+ * caught and the catch clause has been ended normally.
+ */
+ static void
+discard_exception(excp, was_finished)
+ except_T *excp;
+ int was_finished;
+{
+ char_u *saved_IObuff;
+
+ if (excp == NULL)
+ {
+ EMSG(_(e_internal));
+ return;
+ }
+
+ if (p_verbose >= 13 || debug_break_level > 0)
+ {
+ int save_msg_silent = msg_silent;
+
+ saved_IObuff = vim_strsave(IObuff);
+ if (debug_break_level > 0)
+ msg_silent = FALSE; /* display messages */
+ ++no_wait_return;
+ msg_scroll = TRUE; /* always scroll up, don't overwrite */
+ msg_str(was_finished
+ ? (char_u *)_("Exception finished: %s")
+ : (char_u *)_("Exception discarded: %s"),
+ excp->value);
+ msg_puts((char_u *)"\n"); /* don't overwrite this either */
+ cmdline_row = msg_row;
+ --no_wait_return;
+ if (debug_break_level > 0)
+ msg_silent = save_msg_silent;
+ STRCPY(IObuff, saved_IObuff);
+ vim_free(saved_IObuff);
+ }
+ if (excp->type != ET_INTERRUPT)
+ vim_free(excp->value);
+ if (excp->type == ET_ERROR)
+ free_msglist(excp->messages);
+ vim_free(excp->throw_name);
+ vim_free(excp);
+}
+
+/*
+ * Discard the exception currently being thrown.
+ */
+ void
+discard_current_exception()
+{
+ discard_exception(current_exception, FALSE);
+ current_exception = NULL;
+ did_throw = FALSE;
+ need_rethrow = FALSE;
+}
+
+/*
+ * Put an exception on the caught stack.
+ */
+ static void
+catch_exception(excp)
+ except_T *excp;
+{
+ excp->caught = caught_stack;
+ caught_stack = excp;
+ set_vim_var_string(VV_EXCEPTION, excp->value, -1);
+ if (*excp->throw_name != NUL)
+ {
+ if (excp->throw_lnum != 0)
+ sprintf((char *)IObuff, _("%s, line %ld"), excp->throw_name,
+ (long)excp->throw_lnum);
+ else
+ STRCPY(IObuff, excp->throw_name);
+ set_vim_var_string(VV_THROWPOINT, IObuff, -1);
+ }
+ else
+ /* throw_name not set on an exception from a command that was typed. */
+ set_vim_var_string(VV_THROWPOINT, NULL, -1);
+
+ if (p_verbose >= 13 || debug_break_level > 0)
+ {
+ int save_msg_silent = msg_silent;
+
+ if (debug_break_level > 0)
+ msg_silent = FALSE; /* display messages */
+ ++no_wait_return;
+ msg_scroll = TRUE; /* always scroll up, don't overwrite */
+ msg_str((char_u *)_("Exception caught: %s"), excp->value);
+ msg_puts((char_u *)"\n"); /* don't overwrite this either */
+ cmdline_row = msg_row;
+ --no_wait_return;
+ if (debug_break_level > 0)
+ msg_silent = save_msg_silent;
+ }
+}
+
+/*
+ * Remove an exception from the caught stack.
+ */
+ static void
+finish_exception(excp)
+ except_T *excp;
+{
+ if (excp != caught_stack)
+ EMSG(_(e_internal));
+ caught_stack = caught_stack->caught;
+ if (caught_stack != NULL)
+ {
+ set_vim_var_string(VV_EXCEPTION, caught_stack->value, -1);
+ if (*caught_stack->throw_name != NUL)
+ {
+ if (caught_stack->throw_lnum != 0)
+ sprintf((char *)IObuff,
+ _("%s, line %ld"), caught_stack->throw_name,
+ (long)caught_stack->throw_lnum);
+ else
+ STRCPY(IObuff, caught_stack->throw_name);
+ set_vim_var_string(VV_THROWPOINT, IObuff, -1);
+ }
+ else
+ /* throw_name not set on an exception from a command that was
+ * typed. */
+ set_vim_var_string(VV_THROWPOINT, NULL, -1);
+ }
+ else
+ {
+ set_vim_var_string(VV_EXCEPTION, NULL, -1);
+ set_vim_var_string(VV_THROWPOINT, NULL, -1);
+ }
+
+ /* Discard the exception, but use the finish message for 'verbose'. */
+ discard_exception(excp, TRUE);
+}
+
+/*
+ * Flags specifying the message displayed by report_pending.
+ */
+#define RP_MAKE 0
+#define RP_RESUME 1
+#define RP_DISCARD 2
+
+/*
+ * Report information about something pending in a finally clause if required by
+ * the 'verbose' option or when debugging. "action" tells whether something is
+ * made pending or something pending is resumed or discarded. "pending" tells
+ * what is pending. "value" specifies the return value for a pending ":return"
+ * or the exception value for a pending exception.
+ */
+ static void
+report_pending(action, pending, value)
+ int action;
+ int pending;
+ void *value;
+{
+ char_u *mesg;
+ char *s;
+ int save_msg_silent;
+
+
+ switch (action)
+ {
+ case RP_MAKE:
+ mesg = (char_u *)_("%s made pending");
+ break;
+ case RP_RESUME:
+ mesg = (char_u *)_("%s resumed");
+ break;
+ /* case RP_DISCARD: */
+ default:
+ mesg = (char_u *)_("%s discarded");
+ break;
+ }
+
+ switch (pending)
+ {
+ case CSTP_NONE:
+ return;
+
+ case CSTP_CONTINUE:
+ s = ":continue";
+ break;
+ case CSTP_BREAK:
+ s = ":break";
+ break;
+ case CSTP_FINISH:
+ s = ":finish";
+ break;
+ case CSTP_RETURN:
+ /* ":return" command producing value, allocated */
+ s = (char *)get_return_cmd(value);
+ break;
+
+ default:
+ if (pending & CSTP_THROW)
+ {
+ sprintf((char *)IObuff, (char *)mesg, _("Exception"));
+ mesg = vim_strnsave(IObuff, (int)STRLEN(IObuff) + 4);
+ STRCAT(mesg, ": %s");
+ s = (char *)((except_T *)value)->value;
+ }
+ else if ((pending & CSTP_ERROR) && (pending & CSTP_INTERRUPT))
+ s = _("Error and interrupt");
+ else if (pending & CSTP_ERROR)
+ s = _("Error");
+ else /* if (pending & CSTP_INTERRUPT) */
+ s = _("Interrupt");
+ }
+
+ save_msg_silent = msg_silent;
+ if (debug_break_level > 0)
+ msg_silent = FALSE; /* display messages */
+ ++no_wait_return;
+ msg_scroll = TRUE; /* always scroll up, don't overwrite */
+ msg_str(mesg, (char_u *)s);
+ msg_puts((char_u *)"\n"); /* don't overwrite this either */
+ cmdline_row = msg_row;
+ --no_wait_return;
+ if (debug_break_level > 0)
+ msg_silent = save_msg_silent;
+
+ if (pending == CSTP_RETURN)
+ vim_free(s);
+ else if (pending & CSTP_THROW)
+ vim_free(mesg);
+}
+
+/*
+ * If something is made pending in a finally clause, report it if required by
+ * the 'verbose' option or when debugging.
+ */
+ void
+report_make_pending(pending, value)
+ int pending;
+ void *value;
+{
+ if (p_verbose >= 14 || debug_break_level > 0)
+ report_pending(RP_MAKE, pending, value);
+}
+
+/*
+ * If something pending in a finally clause is resumed at the ":endtry", report
+ * it if required by the 'verbose' option or when debugging.
+ */
+ void
+report_resume_pending(pending, value)
+ int pending;
+ void *value;
+{
+ if (p_verbose >= 14 || debug_break_level > 0)
+ report_pending(RP_RESUME, pending, value);
+}
+
+/*
+ * If something pending in a finally clause is discarded, report it if required
+ * by the 'verbose' option or when debugging.
+ */
+ void
+report_discard_pending(pending, value)
+ int pending;
+ void *value;
+{
+ if (p_verbose >= 14 || debug_break_level > 0)
+ report_pending(RP_DISCARD, pending, value);
+}
+
+
+/*
+ * ":if".
+ */
+ void
+ex_if(eap)
+ exarg_T *eap;
+{
+ int error;
+ int skip;
+ int result;
+ struct condstack *cstack = eap->cstack;
+
+ if (cstack->cs_idx == CSTACK_LEN - 1)
+ eap->errmsg = (char_u *)N_("E579: :if nesting too deep");
+ else
+ {
+ ++cstack->cs_idx;
+ cstack->cs_flags[cstack->cs_idx] = 0;
+
+ /*
+ * Don't do something after an error, interrupt, or throw, or when there
+ * is a surrounding conditional and it was not active.
+ */
+ skip = did_emsg || got_int || did_throw || (cstack->cs_idx > 0
+ && !(cstack->cs_flags[cstack->cs_idx - 1] & CSF_ACTIVE));
+
+ result = eval_to_bool(eap->arg, &error, &eap->nextcmd, skip);
+
+ if (!skip && !error)
+ {
+ if (result)
+ cstack->cs_flags[cstack->cs_idx] = CSF_ACTIVE | CSF_TRUE;
+ }
+ else
+ /* set TRUE, so this conditional will never get active */
+ cstack->cs_flags[cstack->cs_idx] = CSF_TRUE;
+ }
+}
+
+/*
+ * ":endif".
+ */
+ void
+ex_endif(eap)
+ exarg_T *eap;
+{
+ did_endif = TRUE;
+ if (eap->cstack->cs_idx < 0
+ || (eap->cstack->cs_flags[eap->cstack->cs_idx] &
+ (CSF_WHILE | CSF_TRY)))
+ eap->errmsg = (char_u *)N_("E580: :endif without :if");
+ else
+ {
+ /*
+ * When debugging or a breakpoint was encountered, display the debug
+ * prompt (if not already done). This shows the user that an ":endif"
+ * is executed when the ":if" or a previous ":elseif" was not TRUE.
+ * Handle a ">quit" debug command as if an interrupt had occurred before
+ * the ":endif". That is, throw an interrupt exception if appropriate.
+ * Doing this here prevents an exception for a parsing error being
+ * discarded by throwing the interrupt exception later on.
+ */
+ if (!(eap->cstack->cs_flags[eap->cstack->cs_idx] & CSF_TRUE) &&
+ dbg_check_skipped(eap))
+ (void)do_intthrow(eap->cstack);
+
+ --eap->cstack->cs_idx;
+ }
+}
+
+/*
+ * ":else" and ":elseif".
+ */
+ void
+ex_else(eap)
+ exarg_T *eap;
+{
+ int error;
+ int skip;
+ int result;
+ struct condstack *cstack = eap->cstack;
+
+ /*
+ * Don't do something after an error, interrupt, or throw, or when there is
+ * a surrounding conditional and it was not active.
+ */
+ skip = did_emsg || got_int || did_throw || (cstack->cs_idx > 0
+ && !(cstack->cs_flags[cstack->cs_idx - 1] & CSF_ACTIVE));
+
+ if (cstack->cs_idx < 0
+ || (cstack->cs_flags[cstack->cs_idx] & (CSF_WHILE | CSF_TRY)))
+ {
+ if (eap->cmdidx == CMD_else)
+ {
+ eap->errmsg = (char_u *)N_("E581: :else without :if");
+ return;
+ }
+ eap->errmsg = (char_u *)N_("E582: :elseif without :if");
+ skip = TRUE;
+ }
+ else if (cstack->cs_flags[cstack->cs_idx] & CSF_ELSE)
+ {
+ if (eap->cmdidx == CMD_else)
+ {
+ eap->errmsg = (char_u *)N_("E583: multiple :else");
+ return;
+ }
+ eap->errmsg = (char_u *)N_("E584: :elseif after :else");
+ skip = TRUE;
+ }
+
+ /* if skipping or the ":if" was TRUE, reset ACTIVE, otherwise set it */
+ if (skip || cstack->cs_flags[cstack->cs_idx] & CSF_TRUE)
+ {
+ if (eap->errmsg == NULL)
+ cstack->cs_flags[cstack->cs_idx] = CSF_TRUE;
+ skip = TRUE; /* don't evaluate an ":elseif" */
+ }
+ else
+ cstack->cs_flags[cstack->cs_idx] = CSF_ACTIVE;
+
+ /*
+ * When debugging or a breakpoint was encountered, display the debug prompt
+ * (if not already done). This shows the user that an ":else" or ":elseif"
+ * is executed when the ":if" or previous ":elseif" was not TRUE. Handle
+ * a ">quit" debug command as if an interrupt had occurred before the
+ * ":else" or ":elseif". That is, set "skip" and throw an interrupt
+ * exception if appropriate. Doing this here prevents that an exception
+ * for a parsing errors is discarded when throwing the interrupt exception
+ * later on.
+ */
+ if (!skip && dbg_check_skipped(eap) && got_int)
+ {
+ (void)do_intthrow(cstack);
+ skip = TRUE;
+ }
+
+ if (eap->cmdidx == CMD_elseif)
+ {
+ result = eval_to_bool(eap->arg, &error, &eap->nextcmd, skip);
+ /* When throwing error exceptions, we want to throw always the first
+ * of several errors in a row. This is what actually happens when
+ * a conditional error was detected above and there is another failure
+ * when parsing the expression. Since the skip flag is set in this
+ * case, the parsing error will be ignored by emsg(). */
+
+ if (!skip && !error)
+ {
+ if (result)
+ cstack->cs_flags[cstack->cs_idx] = CSF_ACTIVE | CSF_TRUE;
+ else
+ cstack->cs_flags[cstack->cs_idx] = 0;
+ }
+ else if (eap->errmsg == NULL)
+ /* set TRUE, so this conditional will never get active */
+ cstack->cs_flags[cstack->cs_idx] = CSF_TRUE;
+ }
+ else
+ cstack->cs_flags[cstack->cs_idx] |= CSF_ELSE;
+}
+
+/*
+ * Handle ":while".
+ */
+ void
+ex_while(eap)
+ exarg_T *eap;
+{
+ int error;
+ int skip;
+ int result;
+ struct condstack *cstack = eap->cstack;
+
+ if (cstack->cs_idx == CSTACK_LEN - 1)
+ eap->errmsg = (char_u *)N_("E585: :while nesting too deep");
+ else
+ {
+ /*
+ * cs_had_while is set when we have jumped back from the matching
+ * ":endwhile". When not set, need to initialise this cstack entry.
+ */
+ if (!cstack->cs_had_while)
+ {
+ ++cstack->cs_idx;
+ ++cstack->cs_whilelevel;
+ cstack->cs_line[cstack->cs_idx] = -1;
+ }
+ cstack->cs_flags[cstack->cs_idx] = CSF_WHILE;
+
+ /*
+ * Don't do something after an error, interrupt, or throw, or when there
+ * is a surrounding conditional and it was not active.
+ */
+ skip = did_emsg || got_int || did_throw || (cstack->cs_idx > 0
+ && !(cstack->cs_flags[cstack->cs_idx - 1] & CSF_ACTIVE));
+ result = eval_to_bool(eap->arg, &error, &eap->nextcmd, skip);
+
+ /*
+ * If this cstack entry was just initialised and is active, set
+ * cs_had_while flag, so do_cmdline() will set the line number
+ * in cs_line[].
+ */
+ if (!skip && !error && result)
+ {
+ cstack->cs_flags[cstack->cs_idx] |= CSF_ACTIVE | CSF_TRUE;
+ cstack->cs_had_while = !cstack->cs_had_while;
+ }
+ else
+ {
+ cstack->cs_had_while = FALSE;
+ /* If the ":while" evaluates to FALSE, show the debug prompt at the
+ * ":endwhile" as if there was a ":break" in a ":while" evaluating
+ * to TRUE. */
+ if (!skip && !error)
+ cstack->cs_flags[cstack->cs_idx] |= CSF_TRUE;
+ }
+ }
+}
+
+/*
+ * ":continue"
+ */
+ void
+ex_continue(eap)
+ exarg_T *eap;
+{
+ int idx;
+ struct condstack *cstack = eap->cstack;
+
+ if (cstack->cs_whilelevel <= 0 || cstack->cs_idx < 0)
+ eap->errmsg = (char_u *)N_("E586: :continue without :while");
+ else
+ {
+ /* Try to find the matching ":while". This might stop at a try
+ * conditional not in its finally clause (which is then to be executed
+ * next). Therefor, inactivate all conditionals except the ":while"
+ * itself (if reached). */
+ idx = cleanup_conditionals(cstack, CSF_WHILE, FALSE);
+ if ((cstack->cs_flags[idx] & CSF_WHILE))
+ {
+ if (cstack->cs_idx > idx)
+ rewind_conditionals(cstack, idx, CSF_TRY, &cstack->cs_trylevel);
+
+ /*
+ * Set cs_had_continue, so do_cmdline() will jump back to the
+ * matching ":while".
+ */
+ cstack->cs_had_continue = TRUE; /* let do_cmdline() handle it */
+ }
+ else
+ {
+ /* If a try conditional not in its finally clause is reached first,
+ * make the ":continue" pending for execution at the ":endtry". */
+ cstack->cs_pending[idx] = CSTP_CONTINUE;
+ report_make_pending(CSTP_CONTINUE, NULL);
+ }
+ }
+}
+
+/*
+ * ":break"
+ */
+ void
+ex_break(eap)
+ exarg_T *eap;
+{
+ int idx;
+ struct condstack *cstack = eap->cstack;
+
+ if (cstack->cs_whilelevel <= 0 || cstack->cs_idx < 0)
+ eap->errmsg = (char_u *)N_("E587: :break without :while");
+ else
+ {
+ /* Inactivate conditionals until the matching ":while" or a try
+ * conditional not in its finally clause (which is then to be
+ * executed next) is found. In the latter case, make the ":break"
+ * pending for execution at the ":endtry". */
+ idx = cleanup_conditionals(cstack, CSF_WHILE, TRUE);
+ if (!(cstack->cs_flags[idx] & CSF_WHILE))
+ {
+ cstack->cs_pending[idx] = CSTP_BREAK;
+ report_make_pending(CSTP_BREAK, NULL);
+ }
+ }
+}
+
+/*
+ * ":endwhile"
+ */
+ void
+ex_endwhile(eap)
+ exarg_T *eap;
+{
+ struct condstack *cstack = eap->cstack;
+ int idx;
+
+ if (cstack->cs_whilelevel <= 0 || cstack->cs_idx < 0)
+ eap->errmsg = e_while;
+ else
+ {
+ if (!(cstack->cs_flags[cstack->cs_idx] & CSF_WHILE))
+ {
+ /* Try to find the matching ":while" and report what's missing. */
+ if (!(cstack->cs_flags[cstack->cs_idx] & CSF_TRY))
+ eap->errmsg = e_endif;
+ else if (cstack->cs_flags[cstack->cs_idx] & CSF_FINALLY)
+ eap->errmsg = e_endtry;
+ for (idx = cstack->cs_idx; idx > 0; --idx)
+ {
+ if ((cstack->cs_flags[idx] & CSF_TRY)
+ && !(cstack->cs_flags[idx] & CSF_FINALLY))
+ {
+ /* Give up at a try conditional not in its finally clause.
+ * Ignore the ":endwhile". */
+ eap->errmsg = e_while;
+ return;
+ }
+ if (cstack->cs_flags[idx] & CSF_WHILE)
+ break;
+ }
+ /* Cleanup and rewind all contained (and unclosed) conditionals. */
+ (void)cleanup_conditionals(cstack, CSF_WHILE, FALSE);
+ rewind_conditionals(cstack, idx, CSF_TRY, &cstack->cs_trylevel);
+ }
+
+ /*
+ * When debugging or a breakpoint was encountered, display the debug
+ * prompt (if not already done). This shows the user that an
+ * ":enwhile" is executed when the ":while" was not TRUE or after
+ * a ":break". Handle a ">quit" debug command as if an interrupt
+ * had occurred before the ":endwhile". That is, throw an interrupt
+ * exception if appropriate. Doing this here prevents that an
+ * exception for a parsing error is discarded when throwing the
+ * interrupt exception later on.
+ */
+ else if (cstack->cs_flags[cstack->cs_idx] & CSF_TRUE
+ && !(cstack->cs_flags[cstack->cs_idx] & CSF_ACTIVE)
+ && dbg_check_skipped(eap))
+ (void)do_intthrow(cstack);
+
+ /*
+ * Set cs_had_endwhile, so do_cmdline() will jump back to the matching
+ * ":while".
+ */
+ cstack->cs_had_endwhile = TRUE;
+ }
+}
+
+
+/*
+ * ":throw expr"
+ */
+ void
+ex_throw(eap)
+ exarg_T *eap;
+{
+ char_u *arg = eap->arg;
+ char_u *value;
+
+ if (*arg != NUL && *arg != '|' && *arg != '\n')
+ value = eval_to_string_skip(arg, &eap->nextcmd, eap->skip);
+ else
+ {
+ EMSG(_(e_argreq));
+ value = NULL;
+ }
+
+ /* On error or when an exception is thrown during argument evaluation, do
+ * not throw. */
+ if (!eap->skip && value != NULL)
+ {
+ if (throw_exception(value, ET_USER, NULL) == FAIL)
+ vim_free(value);
+ else
+ do_throw(eap->cstack);
+ }
+}
+
+/*
+ * Throw the current exception through the specified cstack. Common routine for
+ * ":throw" (user exception) and error and interrupt exceptions. Also used for
+ * rethrowing an uncaught exception.
+ */
+ void
+do_throw(cstack)
+ struct condstack *cstack;
+{
+ int idx;
+ int inactivate_try = FALSE;
+
+ /*
+ * Cleanup and inactivate up to the next surrounding try conditional that
+ * is not in its finally clause. Normally, do not inactivate the try
+ * conditional itself, so that its ACTIVE flag can be tested below. But
+ * if a previous error or interrupt has not been converted to an exception,
+ * inactivate the try conditional, too, as if the conversion had been done,
+ * and reset the did_emsg or got_int flag, so this won't happen again at the
+ * next surrounding try conditional.
+ */
+ if (did_emsg && !THROW_ON_ERROR)
+ {
+ inactivate_try = TRUE;
+ did_emsg = FALSE;
+ }
+ if (got_int && !THROW_ON_INTERRUPT)
+ {
+ inactivate_try = TRUE;
+ got_int = FALSE;
+ }
+ idx = cleanup_conditionals(cstack, 0, inactivate_try);
+ if (idx >= 0)
+ {
+ /*
+ * If this try conditional is active and we are before its first
+ * ":catch", set THROWN so that the ":catch" commands will check whether
+ * the exception matches. When the exception came from any of the
+ * catch clauses, it will be made pending at the ":finally" (if present)
+ * and rethrown at the ":endtry". This will also happen if the try
+ * conditional is inactive. This is the case when we are throwing an
+ * exception due to an error or interrupt on the way from a preceding
+ * ":continue", ":break", ":return", ":finish", error or interrupt (not
+ * converted to an exception) to the finally clause or from a preceding
+ * throw of a user or error or interrupt exception to the matching catch
+ * clause or the finally clause.
+ */
+ if (!(cstack->cs_flags[idx] & CSF_CAUGHT))
+ {
+ if (cstack->cs_flags[idx] & CSF_ACTIVE)
+ cstack->cs_flags[idx] |= CSF_THROWN;
+ else
+ /* THROWN may have already been set for a catchable exception
+ * that has been discarded. Ensure it is reset for the new
+ * exception. */
+ cstack->cs_flags[idx] &= ~CSF_THROWN;
+ }
+ cstack->cs_flags[idx] &= ~CSF_ACTIVE;
+ cstack->cs_exception[idx] = current_exception;
+ }
+#if 0
+ /* TODO: Add optimization below. Not yet done because of interface problems
+ * to eval.c and ex_cmds2.c. (Servatius) */
+ else
+ {
+ /*
+ * There are no catch clauses to check or finally clauses to execute.
+ * End the current script or function. The exception will be rethrown
+ * in the caller.
+ */
+ if (getline_equal(eap->getline, eap->cookie, get_func_line))
+ current_funccal->returned = TRUE;
+ elseif (eap->get_func_line == getsourceline)
+ ((struct source_cookie *)eap->cookie)->finished = TRUE;
+ }
+#endif
+
+ did_throw = TRUE;
+}
+
+/*
+ * ":try"
+ */
+ void
+ex_try(eap)
+ exarg_T *eap;
+{
+ int skip;
+ struct condstack *cstack = eap->cstack;
+
+ if (cstack->cs_idx == CSTACK_LEN - 1)
+ eap->errmsg = (char_u *)N_("E601: :try nesting too deep");
+ else
+ {
+ ++cstack->cs_idx;
+ ++cstack->cs_trylevel;
+ cstack->cs_flags[cstack->cs_idx] = CSF_TRY;
+ cstack->cs_pending[cstack->cs_idx] = CSTP_NONE;
+
+ /*
+ * Don't do something after an error, interrupt, or throw, or when there
+ * is a surrounding conditional and it was not active.
+ */
+ skip = did_emsg || got_int || did_throw || (cstack->cs_idx > 0
+ && !(cstack->cs_flags[cstack->cs_idx - 1] & CSF_ACTIVE));
+
+ if (!skip)
+ {
+ /* Set ACTIVE and TRUE. TRUE means that the corresponding ":catch"
+ * commands should check for a match if an exception is thrown and
+ * that the finally clause needs to be executed. */
+ cstack->cs_flags[cstack->cs_idx] |= CSF_ACTIVE | CSF_TRUE;
+
+ /*
+ * ":silent!", even when used in a try conditional, disables
+ * displaying of error messages and conversion of errors to
+ * exceptions. When the silent commands again open a try
+ * conditional, save "emsg_silent" and reset it so that errors are
+ * again converted to exceptions. The value is restored when that
+ * try conditional is left. If it is left normally, the commands
+ * following the ":endtry" are again silent. If it is left by
+ * a ":continue", ":break", ":return", or ":finish", the commands
+ * executed next are again silent. If it is left due to an
+ * aborting error, an interrupt, or an exception, restoring
+ * "emsg_silent" does not matter since we are already in the
+ * aborting state and/or the exception has already been thrown.
+ * The effect is then just freeing the memory that was allocated
+ * to save the value.
+ */
+ if (emsg_silent)
+ {
+ eslist_T *elem;
+
+ elem = (eslist_T *)alloc((unsigned)sizeof(struct eslist_elem));
+ if (elem == NULL)
+ EMSG(_(e_outofmem));
+ else
+ {
+ elem->saved_emsg_silent = emsg_silent;
+ elem->next = cstack->cs_emsg_silent_list;
+ cstack->cs_emsg_silent_list = elem;
+ cstack->cs_flags[cstack->cs_idx] |= CSF_SILENT;
+ emsg_silent = 0;
+ }
+ }
+ }
+
+ }
+}
+
+/*
+ * ":catch /{pattern}/" and ":catch"
+ */
+ void
+ex_catch(eap)
+ exarg_T *eap;
+{
+ int idx = 0;
+ int give_up = FALSE;
+ int skip = FALSE;
+ int caught = FALSE;
+ char_u *end;
+ int save_char = 0;
+ char_u *save_cpo;
+ regmatch_T regmatch;
+ int prev_got_int;
+ struct condstack *cstack = eap->cstack;
+ char_u *pat;
+
+ if (cstack->cs_trylevel <= 0 || cstack->cs_idx < 0)
+ {
+ eap->errmsg = (char_u *)N_("E603: :catch without :try");
+ give_up = TRUE;
+ }
+ else
+ {
+ if (!(cstack->cs_flags[cstack->cs_idx] & CSF_TRY))
+ {
+ /* Report what's missing if the matching ":try" is not in its
+ * finally clause. */
+ if (cstack->cs_flags[cstack->cs_idx] & CSF_WHILE)
+ eap->errmsg = e_endwhile;
+ else
+ eap->errmsg = e_endif;
+ skip = TRUE;
+ }
+ for (idx = cstack->cs_idx; idx > 0; --idx)
+ if (cstack->cs_flags[idx] & CSF_TRY)
+ break;
+ if (cstack->cs_flags[idx] & CSF_FINALLY)
+ {
+ /* Give up for a ":catch" after ":finally" and ignore it.
+ * Just parse. */
+ eap->errmsg = (char_u *)N_("E604: :catch after :finally");
+ give_up = TRUE;
+ }
+ else if (cstack->cs_idx > idx)
+ rewind_conditionals(cstack, idx, CSF_WHILE, &cstack->cs_whilelevel);
+ }
+
+ if (ends_excmd(*eap->arg)) /* no argument, catch all errors */
+ {
+ pat = (char_u *)".*";
+ end = NULL;
+ eap->nextcmd = find_nextcmd(eap->arg);
+ }
+ else
+ {
+ pat = eap->arg + 1;
+ end = skip_regexp(pat, *eap->arg, TRUE, NULL);
+ }
+
+ if (!give_up)
+ {
+ /*
+ * Don't do something when no exception has been thrown or when the
+ * corresponding try block never got active (because of an inactive
+ * surrounding conditional or after an error or interrupt or throw).
+ */
+ if (!did_throw || !(cstack->cs_flags[idx] & CSF_TRUE))
+ skip = TRUE;
+
+ /*
+ * Check for a match only if an exception is thrown but not caught by
+ * a previous ":catch". An exception that has replaced a discarded
+ * exception is not checked (THROWN is not set then).
+ */
+ if (!skip && (cstack->cs_flags[idx] & CSF_THROWN)
+ && !(cstack->cs_flags[idx] & CSF_CAUGHT))
+ {
+ if (end != NULL && *end != NUL && !ends_excmd(*skipwhite(end + 1)))
+ {
+ EMSG(_(e_trailing));
+ return;
+ }
+
+ /* When debugging or a breakpoint was encountered, display the
+ * debug prompt (if not already done) before checking for a match.
+ * This is a helpful hint for the user when the regular expression
+ * matching fails. Handle a ">quit" debug command as if an
+ * interrupt had occurred before the ":catch". That is, discard
+ * the original exception, replace it by an interrupt exception,
+ * and don't catch it in this try block. */
+ if (!dbg_check_skipped(eap) || !do_intthrow(cstack))
+ {
+ /* Terminate the pattern and avoid the 'l' flag in 'cpoptions'
+ * while compiling it. */
+ if (end != NULL)
+ {
+ save_char = *end;
+ *end = NUL;
+ }
+ save_cpo = p_cpo;
+ p_cpo = (char_u *)"";
+ regmatch.regprog = vim_regcomp(pat, TRUE);
+ regmatch.rm_ic = FALSE;
+ if (end != NULL)
+ *end = save_char;
+ p_cpo = save_cpo;
+ if (regmatch.regprog == NULL)
+ EMSG2(_(e_invarg2), pat);
+ else
+ {
+ /*
+ * Save the value of got_int and reset it. We don't want
+ * a previous interruption cancel matching, only hitting
+ * CTRL-C while matching should abort it.
+ */
+ prev_got_int = got_int;
+ got_int = FALSE;
+ caught = vim_regexec_nl(&regmatch, current_exception->value,
+ (colnr_T)0);
+ got_int |= prev_got_int;
+ vim_free(regmatch.regprog);
+ }
+ }
+ }
+
+ if (caught)
+ {
+ /* Make this ":catch" clause active and reset did_emsg, got_int,
+ * and did_throw. Put the exception on the caught stack. */
+ cstack->cs_flags[idx] |= CSF_ACTIVE | CSF_CAUGHT;
+ did_emsg = got_int = did_throw = FALSE;
+ catch_exception((except_T *)cstack->cs_exception[idx]);
+ /* It's mandatory that the current exception is stored in the cstack
+ * so that it can be discarded at the next ":catch", ":finally", or
+ * ":endtry" or when the catch clause is left by a ":continue",
+ * ":break", ":return", ":finish", error, interrupt, or another
+ * exception. */
+ if (cstack->cs_exception[cstack->cs_idx] != current_exception)
+ EMSG(_(e_internal));
+ }
+ else
+ {
+ /*
+ * If there is a preceding catch clause and it caught the exception,
+ * finish the exception now. This happens also after errors except
+ * when this ":catch" was after the ":finally" or not within
+ * a ":try". Make the try conditional inactive so that the
+ * following catch clauses are skipped. On an error or interrupt
+ * after the preceding try block or catch clause was left by
+ * a ":continue", ":break", ":return", or ":finish", discard the
+ * pending action.
+ */
+ cleanup_conditionals(cstack, CSF_TRY, TRUE);
+ }
+ }
+
+ if (end != NULL)
+ eap->nextcmd = find_nextcmd(end);
+}
+
+/*
+ * ":finally"
+ */
+ void
+ex_finally(eap)
+ exarg_T *eap;
+{
+ int idx;
+ int skip = FALSE;
+ int pending = CSTP_NONE;
+ struct condstack *cstack = eap->cstack;
+
+ if (cstack->cs_trylevel <= 0 || cstack->cs_idx < 0)
+ eap->errmsg = (char_u *)N_("E606: :finally without :try");
+ else
+ {
+ if (!(cstack->cs_flags[cstack->cs_idx] & CSF_TRY))
+ {
+ /* Find the matching ":try" and report what's missing. */
+ if (cstack->cs_flags[cstack->cs_idx] & CSF_WHILE)
+ eap->errmsg = e_endwhile;
+ else
+ eap->errmsg = e_endif;
+ for (idx = cstack->cs_idx - 1; idx > 0; --idx)
+ if (cstack->cs_flags[idx] & CSF_TRY)
+ break;
+ /* Make this error pending, so that the commands in the following
+ * finally clause can be executed. This overrules also a pending
+ * ":continue", ":break", ":return", or ":finish". */
+ pending = CSTP_ERROR;
+ }
+ else
+ idx = cstack->cs_idx;
+
+ if (cstack->cs_flags[idx] & CSF_FINALLY)
+ {
+ /* Give up for a multiple ":finally" and ignore it. */
+ eap->errmsg = (char_u *)N_("E607: multiple :finally");
+ return;
+ }
+ if (cstack->cs_idx > idx)
+ rewind_conditionals(cstack, idx, CSF_WHILE, &cstack->cs_whilelevel);
+
+ /*
+ * Don't do something when the corresponding try block never got active
+ * (because of an inactive surrounding conditional or after an error or
+ * interrupt or throw) or for a ":finally" without ":try" or a multiple
+ * ":finally". After every other error (did_emsg or the conditional
+ * errors detected above) or after an interrupt (got_int) or an
+ * exception (did_throw), the finally clause must be executed.
+ */
+ skip = !(cstack->cs_flags[cstack->cs_idx] & CSF_TRUE);
+
+ if (!skip)
+ {
+ /* When debugging or a breakpoint was encountered, display the
+ * debug prompt (if not already done). The user then knows that the
+ * finally clause is executed. */
+ if (dbg_check_skipped(eap))
+ {
+ /* Handle a ">quit" debug command as if an interrupt had
+ * occurred before the ":finally". That is, discard the
+ * original exception and replace it by an interrupt
+ * exception. */
+ (void)do_intthrow(cstack);
+ }
+
+ /*
+ * If there is a preceding catch clause and it caught the exception,
+ * finish the exception now. This happens also after errors except
+ * when this is a multiple ":finally" or one not within a ":try".
+ * After an error or interrupt, this also discards a pending
+ * ":continue", ":break", ":finish", or ":return" from the preceding
+ * try block or catch clause.
+ */
+ cleanup_conditionals(cstack, CSF_TRY, FALSE);
+
+ /*
+ * Make did_emsg, got_int, did_throw pending. If set, they overrule
+ * a pending ":continue", ":break", ":return", or ":finish". Then
+ * we have particularly to discard a pending return value (as done
+ * by the call to cleanup_conditionals() above when did_emsg or
+ * got_int is set). The pending values are restored by the
+ * ":endtry", except if there is a new error, interrupt, exception,
+ * ":continue", ":break", ":return", or ":finish" in the following
+ * finally clause. A missing ":endwhile" or ":endif" detected here
+ * is treated as if did_emsg and did_throw had already been set,
+ * respectively in case that the error is not converted to an
+ * exception, did_throw had already been unset. We must not set
+ * did_emsg here since that would suppress the error message.
+ */
+ if (pending == CSTP_ERROR || did_emsg || got_int || did_throw)
+ {
+ if (cstack->cs_pending[cstack->cs_idx] == CSTP_RETURN)
+ {
+ report_discard_pending(CSTP_RETURN,
+ cstack->cs_retvar[cstack->cs_idx]);
+ discard_pending_return(cstack->cs_retvar[cstack->cs_idx]);
+ }
+ if (pending == CSTP_ERROR && !did_emsg)
+ pending |= (THROW_ON_ERROR) ? CSTP_THROW : 0;
+ else
+ pending |= did_throw ? CSTP_THROW : 0;
+ pending |= did_emsg ? CSTP_ERROR : 0;
+ pending |= got_int ? CSTP_INTERRUPT : 0;
+ cstack->cs_pending[cstack->cs_idx] = pending;
+
+ /* It's mandatory that the current exception is stored in the
+ * cstack so that it can be rethrown at the ":endtry" or be
+ * discarded if the finally clause is left by a ":continue",
+ * ":break", ":return", ":finish", error, interrupt, or another
+ * exception. When emsg() is called for a missing ":endif" or
+ * a missing ":endwhile" detected here, the exception will be
+ * discarded. */
+ if (did_throw && cstack->cs_exception[cstack->cs_idx] !=
+ current_exception)
+ EMSG(_(e_internal));
+ }
+
+ /*
+ * Set cs_had_finally, so do_cmdline() will reset did_emsg, got_int,
+ * and did_throw and make the finally clause active. This will
+ * happen after emsg() has been called for a missing ":endif" or
+ * a missing ":endwhile" detected here, so that the following
+ * finally clause will be executed even then.
+ */
+ cstack->cs_had_finally = TRUE;
+ }
+ }
+}
+
+/*
+ * ":endtry"
+ */
+ void
+ex_endtry(eap)
+ exarg_T *eap;
+{
+ int idx;
+ int skip;
+ int rethrow = FALSE;
+ int pending = CSTP_NONE;
+ void *retvar = NULL;
+ struct condstack *cstack = eap->cstack;
+
+ if (cstack->cs_trylevel <= 0 || cstack->cs_idx < 0)
+ eap->errmsg = (char_u *)N_("E602: :endtry without :try");
+ else
+ {
+ /*
+ * Don't do something after an error, interrupt or throw in the try
+ * block, catch clause, or finally clause preceding this ":endtry" or
+ * when an error or interrupt occurred after a ":continue", ":break",
+ * ":return", or ":finish" in a try block or catch clause preceding this
+ * ":endtry" or when the try block never got active (because of an
+ * inactive surrounding conditional or after an error or interrupt or
+ * throw) or when there is a surrounding conditional and it has been
+ * made inactive by a ":continue", ":break", ":return", or ":finish" in
+ * the finally clause. The latter case need not be tested since then
+ * anything pending has already been discarded. */
+ skip = did_emsg || got_int || did_throw ||
+ !(cstack->cs_flags[cstack->cs_idx] & CSF_TRUE);
+
+ if (!(cstack->cs_flags[cstack->cs_idx] & CSF_TRY))
+ {
+ /* Find the matching ":try" and report what's missing. */
+ if (cstack->cs_flags[cstack->cs_idx] & CSF_WHILE)
+ eap->errmsg = e_endwhile;
+ else
+ eap->errmsg = e_endif;
+ idx = cstack->cs_idx;
+ do
+ --idx;
+ while (idx > 0 && !(cstack->cs_flags[idx] & CSF_TRY));
+ rewind_conditionals(cstack, idx, CSF_WHILE, &cstack->cs_whilelevel);
+ skip = TRUE;
+
+ /*
+ * If an exception is being thrown, discard it to prevent it from
+ * being rethrown at the end of this function. It would be
+ * discarded by the error message, anyway. Resets did_throw.
+ * This does not affect the script termination due to the error
+ * since "trylevel" is decremented after emsg() has been called.
+ */
+ if (did_throw)
+ discard_current_exception();
+ }
+ else
+ {
+ idx = cstack->cs_idx;
+
+ /*
+ * If we stopped with the exception currently being thrown at this
+ * try conditional since we didn't know that it doesn't have
+ * a finally clause, we need to rethrow it after closing the try
+ * conditional.
+ */
+ if (did_throw && (cstack->cs_flags[idx] & CSF_TRUE)
+ && !(cstack->cs_flags[idx] & CSF_FINALLY))
+ rethrow = TRUE;
+ }
+
+ /* If there was no finally clause, show the user when debugging or
+ * a breakpoint was encountered that the end of the try conditional has
+ * been reached: display the debug prompt (if not already done). Do
+ * this on normal control flow or when an exception was thrown, but not
+ * on an interrupt or error not converted to an exception or when
+ * a ":break", ":continue", ":return", or ":finish" is pending. These
+ * actions are carried out immediately.
+ */
+ if ((rethrow || (!skip
+ && !(cstack->cs_flags[idx] & CSF_FINALLY)
+ && !cstack->cs_pending[idx]))
+ && dbg_check_skipped(eap))
+ {
+ /* Handle a ">quit" debug command as if an interrupt had occurred
+ * before the ":endtry". That is, throw an interrupt exception and
+ * set "skip" and "rethrow". */
+ if (got_int)
+ {
+ skip = TRUE;
+ (void)do_intthrow(cstack);
+ /* The do_intthrow() call may have reset did_throw or
+ * cstack->cs_pending[idx].*/
+ rethrow = FALSE;
+ if (did_throw && !(cstack->cs_flags[idx] & CSF_FINALLY))
+ rethrow = TRUE;
+ }
+ }
+
+ /*
+ * If a ":return" is pending, we need to resume it after closing the
+ * try conditional; remember the return value. If there was a finally
+ * clause making an exception pending, we need to rethrow it. Make it
+ * the exception currently being thrown.
+ */
+ if (!skip)
+ {
+ pending = cstack->cs_pending[idx];
+ cstack->cs_pending[idx] = CSTP_NONE;
+ if (pending == CSTP_RETURN)
+ retvar = cstack->cs_retvar[idx];
+ else if (pending & CSTP_THROW)
+ current_exception = cstack->cs_exception[idx];
+ }
+
+ /*
+ * Discard anything pending on an error, interrupt, or throw in the
+ * finally clause. If there was no ":finally", discard a pending
+ * ":continue", ":break", ":return", or ":finish" if an error or
+ * interrupt occurred afterwards, but before the ":endtry" was reached.
+ * If an exception was caught by the last of the catch clauses and there
+ * was no finally clause, finish the exception now. This happens also
+ * after errors except when this ":endtry" is not within a ":try".
+ * Restore "emsg_silent" if it has been reset by this try conditional.
+ */
+ cleanup_conditionals(cstack, CSF_TRY | CSF_SILENT, TRUE);
+
+ --cstack->cs_idx;
+ --cstack->cs_trylevel;
+
+ if (!skip)
+ {
+ report_resume_pending(pending,
+ (pending == CSTP_RETURN) ? retvar :
+ (pending & CSTP_THROW) ? (void *)current_exception : NULL);
+ switch (pending)
+ {
+ case CSTP_NONE:
+ break;
+
+ /* Reactivate a pending ":continue", ":break", ":return",
+ * ":finish" from the try block or a catch clause of this try
+ * conditional. This is skipped, if there was an error in an
+ * (unskipped) conditional command or an interrupt afterwards
+ * or if the finally clause is present and executed a new error,
+ * interrupt, throw, ":continue", ":break", ":return", or
+ * ":finish". */
+ case CSTP_CONTINUE:
+ ex_continue(eap);
+ break;
+ case CSTP_BREAK:
+ ex_break(eap);
+ break;
+ case CSTP_RETURN:
+ do_return(eap, FALSE, FALSE, retvar);
+ break;
+ case CSTP_FINISH:
+ do_finish(eap, FALSE);
+ break;
+
+ /* When the finally clause was entered due to an error,
+ * interrupt or throw (as opposed to a ":continue", ":break",
+ * ":return", or ":finish"), restore the pending values of
+ * did_emsg, got_int, and did_throw. This is skipped, if there
+ * was a new error, interrupt, throw, ":continue", ":break",
+ * ":return", or ":finish". in the finally clause. */
+ default:
+ if (pending & CSTP_ERROR)
+ did_emsg = TRUE;
+ if (pending & CSTP_INTERRUPT)
+ got_int = TRUE;
+ if (pending & CSTP_THROW)
+ rethrow = TRUE;
+ break;
+ }
+ }
+
+ if (rethrow)
+ /* Rethrow the current exception (within this cstack). */
+ do_throw(cstack);
+ }
+}
+
+/*
+ * Make conditionals inactive and discard what's pending in finally clauses
+ * until the conditional type searched for or a try conditional not in its
+ * finally clause is reached. If this is in an active catch clause, finish the
+ * caught exception. Return the cstack index where the search stopped. Values
+ * used for "searched_cond" are CSF_WHILE or CSF_TRY or 0, the latter meaning
+ * the innermost try conditional not in its finally clause. "inclusive" tells
+ * whether the conditional searched for should be made inactive itself (a try
+ * conditional not in its finally claused possibly find before is always made
+ * inactive). If "inclusive" is TRUE and "searched_cond" is CSF_TRY|CSF_SILENT,
+ * the saved former value of "emsg_silent", if reset when the try conditional
+ * finally reached was entered, is restored (unsed by ex_endtry()). This is
+ * normally done only when such a try conditional is left.
+ */
+ int
+cleanup_conditionals(cstack, searched_cond, inclusive)
+ struct condstack *cstack;
+ int searched_cond;
+ int inclusive;
+{
+ int idx;
+ int stop = FALSE;
+
+ for (idx = cstack->cs_idx; idx >= 0; --idx)
+ {
+ if (cstack->cs_flags[idx] & CSF_TRY)
+ {
+ /*
+ * Discard anything pending in a finally clause and continue the
+ * search. There may also be a pending ":continue", ":break",
+ * ":return", or ":finish" before the finally clause. We must not
+ * discard it, unless an error or interrupt occurred afterwards.
+ */
+ if (did_emsg || got_int ||
+ (cstack->cs_flags[idx] & CSF_FINALLY))
+ {
+ switch (cstack->cs_pending[idx])
+ {
+ case CSTP_NONE:
+ break;
+
+ case CSTP_CONTINUE:
+ case CSTP_BREAK:
+ case CSTP_FINISH:
+ report_discard_pending(cstack->cs_pending[idx], NULL);
+ cstack->cs_pending[idx] = CSTP_NONE;
+ break;
+
+ case CSTP_RETURN:
+ report_discard_pending(CSTP_RETURN,
+ cstack->cs_retvar[idx]);
+ discard_pending_return(cstack->cs_retvar[idx]);
+ cstack->cs_pending[idx] = CSTP_NONE;
+ break;
+
+ default:
+ if (cstack->cs_flags[idx] & CSF_FINALLY)
+ {
+ if (cstack->cs_pending[idx] & CSTP_THROW)
+ {
+ /* Cancel the pending exception. This is in the
+ * finally clause, so that the stack of the
+ * caught exceptions is not involved. */
+ discard_exception((except_T *)
+ cstack->cs_exception[idx],
+ FALSE);
+ }
+ else
+ report_discard_pending(cstack->cs_pending[idx],
+ NULL);
+ cstack->cs_pending[idx] = CSTP_NONE;
+ }
+ break;
+ }
+ }
+
+ /*
+ * Stop at a try conditional not in its finally clause. If this try
+ * conditional is in an active catch clause, finish the caught
+ * exception.
+ */
+ if (!(cstack->cs_flags[idx] & CSF_FINALLY))
+ {
+ if ((cstack->cs_flags[idx] & CSF_ACTIVE)
+ && (cstack->cs_flags[idx] & CSF_CAUGHT))
+ finish_exception((except_T *)cstack->cs_exception[idx]);
+ /* Stop at this try conditional - except the try block never
+ * got active (because of an inactive surrounding conditional
+ * or when the ":try" appeared after an error or interrupt or
+ * throw). */
+ if (cstack->cs_flags[idx] & CSF_TRUE)
+ {
+ if (searched_cond == 0 && !inclusive)
+ break;
+ stop = TRUE;
+ }
+ }
+ }
+
+ /* Stop on the searched conditional type (even when the surrounding
+ * conditional is not active or something has been made pending).
+ * If "inclusive" is TRUE and "searched_cond" is CSF_TRY|CSF_SILENT,
+ * check first whether "emsg_silent" needs to be restored. */
+ if (cstack->cs_flags[idx] & searched_cond)
+ {
+ if (!inclusive)
+ break;
+ stop = TRUE;
+ }
+ cstack->cs_flags[idx] &= ~CSF_ACTIVE;
+ if (stop && searched_cond != (CSF_TRY | CSF_SILENT))
+ break;
+
+ /*
+ * When leaving a try conditinal that reset "emsg_silent" on its entry
+ * after saving the original value, restore that value here and free the
+ * memory used to store it.
+ */
+ if ((cstack->cs_flags[idx] & CSF_TRY)
+ && (cstack->cs_flags[idx] & CSF_SILENT))
+ {
+ eslist_T *elem;
+
+ elem = cstack->cs_emsg_silent_list;
+ cstack->cs_emsg_silent_list = elem->next;
+ emsg_silent = elem->saved_emsg_silent;
+ vim_free(elem);
+ cstack->cs_flags[idx] &= ~CSF_SILENT;
+ }
+ if (stop)
+ break;
+ }
+ return idx;
+}
+
+/*
+ * Rewind conditionals until index "idx" is reached. "cond_type" and
+ * "cond_level" specify a conditional type and the address of a level variable
+ * which is to be decremented with each skipped conditional of the specified
+ * type.
+ */
+ static void
+rewind_conditionals(cstack, idx, cond_type, cond_level)
+ struct condstack *cstack;
+ int idx;
+ int cond_type;
+ int *cond_level;
+{
+ while (cstack->cs_idx > idx)
+ {
+ if (cstack->cs_flags[cstack->cs_idx] & cond_type)
+ --*cond_level;
+ --cstack->cs_idx;
+ }
+}
+
+/*
+ * ":endfunction" when not after a ":function"
+ */
+/*ARGSUSED*/
+ void
+ex_endfunction(eap)
+ exarg_T *eap;
+{
+ EMSG(_("E193: :endfunction not inside a function"));
+}
+
+/*
+ * Return TRUE if the string "p" looks like a ":while" command.
+ */
+ int
+has_while_cmd(p)
+ char_u *p;
+{
+ p = skipwhite(p);
+ while (*p == ':')
+ p = skipwhite(p + 1);
+ if (p[0] == 'w' && p[1] == 'h')
+ return TRUE;
+ return FALSE;
+}
+
+#endif /* FEAT_EVAL */