class Byebug::ConditionCommand

Implements conditions on breakpoints.

Adds the ability to stop on breakpoints only under certain conditions.

Public Class Methods

description() click to toggle source
# File lib/byebug/commands/condition.rb, line 20
    def self.description
      <<-DESCRIPTION
        cond[ition] <n>[ expr]

        #{short_description}

        Specify breakpoint number <n> to break only if <expr> is true. <n> is
        an integer and <expr> is an expression to be evaluated whenever
        breakpoint <n> is reached. If no expression is specified, the condition
        is removed.
      DESCRIPTION
    end
regexp() click to toggle source
# File lib/byebug/commands/condition.rb, line 16
def self.regexp
  /^\s* cond(?:ition)? (?:\s+(\d+)(?:\s+(.*))?)? \s*$/x
end
short_description() click to toggle source
# File lib/byebug/commands/condition.rb, line 33
def self.short_description
  "Sets conditions on breakpoints"
end

Public Instance Methods

execute() click to toggle source
# File lib/byebug/commands/condition.rb, line 37
def execute
  return puts(help) unless @match[1]

  breakpoints = Byebug.breakpoints.sort_by(&:id)
  return errmsg(pr("condition.errors.no_breakpoints")) if breakpoints.empty?

  pos, err = get_int(@match[1], "Condition", 1)
  return errmsg(err) if err

  breakpoint = breakpoints.find { |b| b.id == pos }
  return errmsg(pr("break.errors.no_breakpoint")) unless breakpoint

  return errmsg(pr("break.errors.not_changed", expr: @match[2])) unless syntax_valid?(@match[2])

  breakpoint.expr = @match[2]
end