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#autoload
# This function is called from functions that do matching whenever they
# need to build a pattern that is used to match possible completions.
# It gets the name of the calling function and two names of parameters
# as arguments. The first one is used in the calling function to build
# the pattern used for matching possible completions. The content of this
# parameter on entry to this function is the string taken from the line.
# Here it parameter should be changed to a pattern that matches words as
# the match specs currently in use do.
# In the calling function this pattern may be changed again or used only
# in parts. The second parameter whose name is given as the third argument
# allows to give pattern flags like `(#l)' that are to be used whenever
# matching is done.
#
# As an example, if you have global match specifications like:
#
# compctl -M 'm:{a-z}={A-Z}' 'm:{a-z}={A-Z} r:|[.-]=* r:|=*'
#
# This function would look like:
#
# eval "${3}='(#l)'"
# [[ compstate[matcher] -eq 2 ]] && eval "$2='${(P)2:gs/./*./:gs/-/*-/}'"
#
# The first line makes sure that matching is done case-insensitive as
# specified by `m:{a-z}={A-Z}'. The second line replaces dots and hyphens
# in the given string by patterns matching any characters before them,
# like the `r:|[.-]=* r:|=*'. To make this work, the function `_match_test'
# would have to be changed to `(( compstate[matcher] <= 2 ))'
#
# The default implementation of this function is empty.
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