# -*- shell-script -*-
# condition.sh - gdb-like "condition" debugger command
#
#   Copyright (C) 2002-2006, 2008, 2009, 2011, 2016
#   Rocky Bernstein rocky@gnu.org
#
#   This program is free software; you can redistribute it and/or
#   modify it under the terms of the GNU General Public License as
#   published by the Free Software Foundation; either version 2, or
#   (at your option) any later version.
#
#   This program is distributed in the hope that it will be useful,
#   but WITHOUT ANY WARRANTY; without even the implied warranty of
#   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
#   General Public License for more details.
#
#   You should have received a copy of the GNU General Public License
#   along with this program; see the file COPYING.  If not, write to
#   the Free Software Foundation, 59 Temple Place, Suite 330, Boston,
#   MA 02111 USA.

_Dbg_help_add condition \
"**condition** *bp_number* *zsh-cond*

+Break only if *bassh-cond* is true in breakpoint number *bp_number*.

*bp_number* is an integer and *cond* is an zsh expression to be evaluated whenever
breakpoint *bp_number* is reached.

Examples:
---------

   condition 5 x > 10  # Breakpoint 5 now has condition x > 10
   condition 5         # Remove above condition

See also:
---------

*break*, *tbreak*.
" 1 _Dbg_complete_brkpt_range

# Set a condition for a given breakpoint $1 is a breakpoint number
# $2 is a condition. If not given, set "unconditional" or 1.
# returns 0 if success or 1 if fail.
proc _Dbg_do_condition {

  if (( $# < 1 ))  {
    _Dbg_errmsg 'condition: Argument required (breakpoint number).'
    return 1
  }

  typeset -r n=$1
  shift

  eval $_seteglob
  if [[ $n != $int_pat ]] {
    eval $_resteglob
    _Dbg_errmsg "condition: Bad breakpoint number: $n"
    return 2
  }
  eval $_resteglob

  if [[ -z ${_Dbg_brkpt_file[$n]} ]]  {
    _Dbg_msg "condition: Breakpoint entry $n is not set. Condition not changed."
    return 3
  }

  if [[ -z $condition ]]  {
    global condition := '1'
    _Dbg_msg "Breakpoint $n now unconditional."
  }
  _Dbg_brkpt_cond[$n]="$condition"
  return 0
}
(CommandList
  children: [
    (C {(_Dbg_help_add)} {(condition)} 
      {
        (DQ ("**condition** *bp_number* *zsh-cond*\n") ("\n") 
          ("+Break only if *bassh-cond* is true in breakpoint number *bp_number*.\n") ("\n") ("*bp_number* is an integer and *cond* is an zsh expression to be evaluated whenever\n") 
          ("breakpoint *bp_number* is reached.\n") ("\n") ("Examples:\n") ("---------\n") ("\n") 
          ("   condition 5 x > 10  # Breakpoint 5 now has condition x > 10\n") ("   condition 5         # Remove above condition\n") ("\n") ("See also:\n") ("---------\n") ("\n") 
          ("*break*, *tbreak*.\n")
        )
      } {(1)} {(_Dbg_complete_brkpt_range)}
    )
    (FuncDef
      name: _Dbg_do_condition
      body: 
        (BraceGroup
          children: [
            (If
              arms: [
                (if_arm
                  cond: [
                    (Sentence
                      child: 
                        (DParen
                          child: 
                            (ArithBinary
                              op_id: Arith_Less
                              left: (ArithWord w:{($ VSub_Pound "$#")})
                              right: (ArithWord w:{(Lit_Digits 1)})
                            )
                        )
                      terminator: <Op_Semi ";">
                    )
                  ]
                  action: [
                    (C {(_Dbg_errmsg)} {(SQ <"condition: Argument required (breakpoint number).">)})
                    (ControlFlow token:<ControlFlow_Return return> arg_word:{(1)})
                  ]
                  spids: [-1 123]
                )
              ]
              spids: [-1 138]
            )
            (C {(typeset)} {(-r)} {(Lit_VarLike "n=") ($ VSub_Number "$1")})
            (C {(shift)})
            (C {(eval)} {(DQ ($ VSub_Name "$_seteglob"))})
            (If
              arms: [
                (if_arm
                  cond: [
                    (Sentence
                      child: 
                        (DBracket
                          expr: 
                            (BoolBinary
                              op_id: BoolBinary_GlobNEqual
                              left: {($ VSub_Name "$n")}
                              right: {($ VSub_Name "$int_pat")}
                            )
                        )
                      terminator: <Op_Semi ";">
                    )
                  ]
                  action: [
                    (C {(eval)} {(DQ ($ VSub_Name "$_resteglob"))})
                    (C {(_Dbg_errmsg)} {(DQ ("condition: Bad breakpoint number: ") ($ VSub_Name "$n"))})
                    (ControlFlow token:<ControlFlow_Return return> arg_word:{(2)})
                  ]
                  spids: [-1 174]
                )
              ]
              spids: [-1 197]
            )
            (C {(eval)} {(DQ ($ VSub_Name "$_resteglob"))})
            (If
              arms: [
                (if_arm
                  cond: [
                    (Sentence
                      child: 
                        (DBracket
                          expr: 
                            (BoolUnary
                              op_id: BoolUnary_z
                              child: 
                                {
                                  (BracedVarSub
                                    token: <VSub_Name _Dbg_brkpt_file>
                                    bracket_op: (ArrayIndex expr:(ArithWord w:{($ VSub_Name "$n")}))
                                    spids: [214 219]
                                  )
                                }
                            )
                        )
                      terminator: <Op_Semi ";">
                    )
                  ]
                  action: [
                    (C {(_Dbg_msg)} 
                      {
                        (DQ ("condition: Breakpoint entry ") ($ VSub_Name "$n") 
                          (" is not set. Condition not changed.")
                        )
                      }
                    )
                    (ControlFlow token:<ControlFlow_Return return> arg_word:{(3)})
                  ]
                  spids: [-1 225]
                )
              ]
              spids: [-1 242]
            )
            (If
              arms: [
                (if_arm
                  cond: [
                    (Sentence
                      child: 
                        (DBracket
                          expr: (BoolUnary op_id:BoolUnary_z child:{($ VSub_Name "$condition")})
                        )
                      terminator: <Op_Semi ";">
                    )
                  ]
                  action: [
                    (Assignment
                      keyword: Assign_None
                      pairs: [
                        (assign_pair
                          lhs: (LhsName name:condition)
                          op: Equal
                          rhs: {(1)}
                          spids: [261]
                        )
                      ]
                      spids: [261]
                    )
                    (C {(_Dbg_msg)} {(DQ ("Breakpoint ") ($ VSub_Name "$n") (" now unconditional."))})
                  ]
                  spids: [-1 258]
                )
              ]
              spids: [-1 274]
            )
            (C 
              {(_Dbg_brkpt_cond) (Lit_Other "[") ($ VSub_Name "$n") (Lit_Other "]") (Lit_Other "=") 
                (DQ ($ VSub_Name "$condition"))
              }
            )
            (ControlFlow token:<ControlFlow_Return return> arg_word:{(0)})
          ]
          spids: [104]
        )
      spids: [100 103]
    )
  ]
)