zsh-syntax-highlighting/highlighters/brackets/brackets-highlighter.zsh
2011-08-08 15:51:40 +02:00

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#!/usr/bin/env zsh
# -------------------------------------------------------------------------------------------------
# Copyright (c) 2010-2011 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}
# Whether the brackets highlighter should be called or not.
_zsh_highlight_brackets_highlighter_predicate()
{
_zsh_highlight_cursor_moved || _zsh_highlight_buffer_modified
}
# Brackets highlighting function.
_zsh_highlight_brackets_highlighter()
{
local level=0 pos
local -A levelpos lastoflevel matching typepos
# Find all brackets and remember which one is matching
for (( pos = 0; $pos < ${#BUFFER}; pos++ )) ; do
local char=$BUFFER[pos+1]
case $char in
["([{"])
levelpos[$pos]=$((++level))
lastoflevel[$level]=$pos
typepos[$pos]=`_zsh_highlight_brackets_highlighter_brackettype $char`
;;
[")]}"])
matching[$lastoflevel[$level]]=$pos
matching[$pos]=$lastoflevel[$level]
levelpos[$pos]=$((level--))
typepos[$pos]=`_zsh_highlight_brackets_highlighter_brackettype $char`
;;
['"'\'])
# Skip everything inside quotes
local quotetype=$char
while (( $pos < ${#BUFFER} )) ; do
(( pos++ ))
[[ $BUFFER[$pos+1] == $quotetype ]] && break
done
;;
esac
done
# Now highlight all found brackets
for pos in ${(k)levelpos}; do
if [[ -z $matching[$pos] ]] || [[ $typepos[$pos] != $typepos[$matching[$pos]] ]]; then
region_highlight+=("$pos $((pos + 1)) "$ZSH_HIGHLIGHT_STYLES[bracket-error])
else
local bracket_color_size=${#ZSH_HIGHLIGHT_STYLES[(I)bracket-level-*]}
local style=bracket-level-$(( (levelpos[$pos] - 1) % bracket_color_size + 1 ))
region_highlight+=("$pos $((pos + 1)) "$ZSH_HIGHLIGHT_STYLES[$style])
fi
done
# If cursor is on a bracket, then highlight corresponding bracket, if any
pos=$CURSOR
if [[ -n $levelpos[$pos] ]] && [[ -n $matching[$pos] ]]; then
local otherpos=$matching[$pos]
region_highlight+=("$otherpos $((otherpos + 1)) standout")
fi
}
# Helper function to differentiate type
_zsh_highlight_brackets_highlighter_brackettype()
{
case $1 in
["()"]) print round;;
["[]"]) print bracket;;
["{}"]) print curly;;
*) ;;
esac
}