zsh-syntax-highlighting/highlighters/brackets/brackets-highlighter.zsh

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# -------------------------------------------------------------------------------------------------
# Copyright (c) 2010-2016 zsh-syntax-highlighting contributors
# All rights reserved.
#
# Redistribution and use in source and binary forms, with or without modification, are permitted
# provided that the following conditions are met:
#
# * Redistributions of source code must retain the above copyright notice, this list of conditions
# and the following disclaimer.
# * Redistributions in binary form must reproduce the above copyright notice, this list of
# conditions and the following disclaimer in the documentation and/or other materials provided
# with the distribution.
# * Neither the name of the zsh-syntax-highlighting contributors nor the names of its contributors
# may be used to endorse or promote products derived from this software without specific prior
# written permission.
#
# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR
# IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
# FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR
# CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
# DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER
# IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
# OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
# -------------------------------------------------------------------------------------------------
# -*- mode: zsh; sh-indentation: 2; indent-tabs-mode: nil; sh-basic-offset: 2; -*-
# vim: ft=zsh sw=2 ts=2 et
# -------------------------------------------------------------------------------------------------
# Define default styles.
: ${ZSH_HIGHLIGHT_STYLES[bracket-error]:=fg=red,bold}
: ${ZSH_HIGHLIGHT_STYLES[bracket-level-1]:=fg=blue,bold}
: ${ZSH_HIGHLIGHT_STYLES[bracket-level-2]:=fg=green,bold}
: ${ZSH_HIGHLIGHT_STYLES[bracket-level-3]:=fg=magenta,bold}
: ${ZSH_HIGHLIGHT_STYLES[bracket-level-4]:=fg=yellow,bold}
: ${ZSH_HIGHLIGHT_STYLES[bracket-level-5]:=fg=cyan,bold}
: ${ZSH_HIGHLIGHT_STYLES[cursor-matchingbracket]:=standout}
# Whether the brackets highlighter should be called or not.
_zsh_highlight_highlighter_brackets_predicate()
{
[[ $WIDGET == zle-line-finish ]] || _zsh_highlight_cursor_moved || _zsh_highlight_buffer_modified
}
# Brackets highlighting function.
_zsh_highlight_highlighter_brackets_paint()
{
local char style
local -i bracket_color_size=${#ZSH_HIGHLIGHT_STYLES[(I)bracket-level-*]} buflen=${#BUFFER} level=0 matchingpos pos
local -A levelpos lastoflevel matching
# Find all brackets and remember which one is matching
for (( pos = 1; pos <= buflen; pos++ )) ; do
char=$BUFFER[pos]
case $char in
["([{"])
levelpos[$pos]=$((++level))
lastoflevel[$level]=$pos
;;
[")]}"])
matchingpos=$lastoflevel[$level]
levelpos[$pos]=$((level--))
if _zsh_highlight_brackets_match $matchingpos $pos; then
matching[$matchingpos]=$pos
matching[$pos]=$matchingpos
fi
;;
['"'\'])
# Skip everything inside quotes
pos=$BUFFER[(ib:pos+1:)$char]
;;
esac
done
# Now highlight all found brackets
for pos in ${(k)levelpos}; do
if (( $+matching[$pos] )); then
if (( bracket_color_size )); then
style=bracket-level-$(( (levelpos[$pos] - 1) % bracket_color_size + 1 ))
fi
else
style=bracket-error
fi
_zsh_highlight_add_highlight $((pos - 1)) $pos $style
done
# If cursor is on a bracket, then highlight corresponding bracket, if any.
if [[ $WIDGET != zle-line-finish ]]; then
pos=$((CURSOR + 1))
if [[ -n $levelpos[$pos] ]] && [[ -n $matching[$pos] ]]; then
local -i otherpos=$matching[$pos]
_zsh_highlight_add_highlight $((otherpos - 1)) $otherpos cursor-matchingbracket
fi
fi
}
# Helper function to differentiate type
_zsh_highlight_brackets_match()
{
case $BUFFER[$1] in
\() [[ $BUFFER[$2] == \) ]];;
\[) [[ $BUFFER[$2] == \] ]];;
\{) [[ $BUFFER[$2] == \} ]];;
*) false;;
esac
}