Wapp

# procs during analysis.
#
proc wapp {txt} {
  global wapp
  dict append wapp .reply $txt
}


# Add text to the page under construction.  Do no escaping on the text.
#
# Though "unsafe" in general, there are uses for this kind of thing.
# For example, if you want to return the complete, unmodified content of
# a file:
#
#         set fd [open content.html rb]
#         wapp-unsafe [read $fd]
#         close $fd
#
# You could do the same thing using ordinary "wapp" instead of "wapp-unsafe".
# The difference is that wapp-safety-check will complain about the misuse
# of "wapp", but it assumes that the person who write "wapp-unsafe" understands
# the risks.
#
# Though occasionally necessary, the use of this interface should be minimized.
#
proc wapp-unsafe {txt} {
  global wapp
  dict append wapp .reply $txt
}


############################ Begin Deprecated Interfaces ######################
# Append text after escaping it for HTML.
#
# The following commands are the same:
#
#      wapp-escape-html TEXT
#      wapp-subst %html(TEXT)
#

    dict unset wapp .csp
  } else {
    dict set wapp .csp $val
  }
}

# Examine the bodys of all procedures in this program looking for
# unsafe calls to various Wapp interfaces.  Return a text string
# containing warnings. Return an empty string if all is ok.
#
# This routine is advisory only.  It misses some constructs that are
# dangerous and flags others that are safe.
#
proc wapp-safety-check {} {
  set res {}
  foreach p [info procs] {
    set ln 0
    foreach x [split [info body $p] \n] {
      incr ln
      if {[regexp {^[ \t]*wapp[ \t]+([^\n]+)} $x all tail]
       && [string index $tail 0]!="\173"
       && [regexp {[[$]} $tail]
      } {
        append res "$p:$ln: unsafe \"wapp\" call: \"[string trim $x]\"\n"
      }
      if {[regexp {^[ \t]*wapp-(subst|trim)[ \t]+[^\173]} $x all cx]} {
        append res "$p:$ln: unsafe \"wapp-$cx\" call: \"[string trim $x]\"\n"
      }
    }
  }
  return $res
}

# Return a string that descripts the current environment.  Applications

      -trace {
        proc wappInt-trace {} {
          set q [wapp-param QUERY_STRING]
          set uri [wapp-param BASE_URL][wapp-param PATH_INFO]
          if {$q!=""} {append uri ?$q}
          puts $uri
        }
      }
      -lint {
        set res [wapp-safety-check]
        if {$res!=""} {
          puts "Potential problems in this code:"
          puts $res
          exit 1
        } else {
          exit
        }
      }
      -D*=* {
        if {[regexp {^.D([^=]+)=(.*)$} $term all var val]} {
          set ::$var $val
        }
      }
      default {