Wapp

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Overview
Comment:Attempt to reimplement wapp-subst and wapp-trim using the -command option to regsub. This prevents bracket-command evaluatation in unsubstituted script, but it does not handle backslash escapes quite right.
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SHA3-256:93523285720f6cc5568a90b87452e953185454b59975cf8cebe342c94bcb2f39
User & Date: drh 2018-02-19 12:32:42
Context
2019-03-06
20:47
Use the -command argument to regexp to provide wapp-subst and wapp-trim that are fast and that avoid doing command substitution outside of quoted regions. check-in: df36e56f70 user: drh tags: trunk
2018-02-19
12:32
Attempt to reimplement wapp-subst and wapp-trim using the -command option to regsub. This prevents bracket-command evaluatation in unsubstituted script, but it does not handle backslash escapes quite right. Closed-Leaf check-in: 9352328572 user: drh tags: regsub-command
2018-02-18
23:45
Allow "%html%(...)%" as an alternative to "%html(...)" for use in cases where the "..." contains one or more ")" characters. check-in: a3a740ad51 user: drh tags: trunk
Changes
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Changes to wapp.tcl.

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# In other words, use "%(...)%" instead of "(...)" to include the TCL string
# to substitute.
#
# The %unsafe substitution should be avoided whenever possible, obviously.
# In addition to the substitutions above, the text also does backslash
# escapes.
#





proc wapp-subst {txt} {
  global wapp

















  regsub -all {%(html|url|qp|string|unsafe){1,1}?(|%)\((.+)\)\2} $txt \
         {[wappInt-enc-\1 "\3"]} txt
  dict append wapp .reply [uplevel 1 [list subst -novariables $txt]]
}

# Works like wapp-subst, but also removes whitespace from the beginning
# of lines.
#
proc wapp-trim {txt} {
  global wapp
  regsub -all {\n\s+} [string trim $txt] \n txt
  regsub -all {%(html|url|qp|string|unsafe){1,1}?(|%)\((.+)\)\2} $txt \
         {[wappInt-enc-\1 "\3"]} txt
  dict append wapp .reply [uplevel 1 [list subst -novariables $txt]]

}

# There must be a wappInt-enc-NAME routine for each possible substitution
# in wapp-subst.  Thus there are routines for "html", "url", "qp", and "unsafe".
#
#    wappInt-enc-html           Escape text so that it is safe to use in the
#                               body of an HTML document.







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# In other words, use "%(...)%" instead of "(...)" to include the TCL string
# to substitute.
#
# The %unsafe substitution should be avoided whenever possible, obviously.
# In addition to the substitutions above, the text also does backslash
# escapes.
#
# The wapp-trim proc works the same as wapp-subst except that it also removes
# whitespace from the left margin, so that the generated HTML/CSS/Javascript
# does not appear to be indented when delivered to the client web browser.
#
if {$tcl_version>=8.7} {
  proc wapp-subst {txt} {
    global wapp
    regsub -all -command \
       {%(html|url|qp|string|unsafe){1,1}?(|%)\((.+)\)\2} $txt wappInt-enc txt
    dict append wapp .reply [subst -novariables -nocommand $txt]
  }
  proc wapp-trim {txt} {
    global wapp
    regsub -all {\n\s+} [string trim $txt] \n txt
    regsub -all -command \
       {%(html|url|qp|string|unsafe){1,1}?(|%)\((.+)\)\2} $txt wappInt-enc txt
    dict append wapp .reply [subst -novariables -nocommand $txt]
  }
  proc wappInt-enc {all mode nu1 txt} {
    return [uplevel 2 "wappInt-enc-$mode \"$txt\""]
  }
} else {
  proc wapp-subst {txt} {
    global wapp
    regsub -all {%(html|url|qp|string|unsafe){1,1}?(|%)\((.+)\)\2} $txt \
           {[wappInt-enc-\1 "\3"]} txt
    dict append wapp .reply [uplevel 1 [list subst -novariables $txt]]
  }




  proc wapp-trim {txt} {
    global wapp
    regsub -all {\n\s+} [string trim $txt] \n txt
    regsub -all {%(html|url|qp|string|unsafe){1,1}?(|%)\((.+)\)\2} $txt \
           {[wappInt-enc-\1 "\3"]} txt
    dict append wapp .reply [uplevel 1 [list subst -novariables $txt]]
  }
}

# There must be a wappInt-enc-NAME routine for each possible substitution
# in wapp-subst.  Thus there are routines for "html", "url", "qp", and "unsafe".
#
#    wappInt-enc-html           Escape text so that it is safe to use in the
#                               body of an HTML document.