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

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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[default]:=none}
: ${ZSH_HIGHLIGHT_STYLES[unknown-token]:=fg=red,bold}
: ${ZSH_HIGHLIGHT_STYLES[reserved-word]:=fg=yellow}
: ${ZSH_HIGHLIGHT_STYLES[alias]:=fg=green}
: ${ZSH_HIGHLIGHT_STYLES[builtin]:=fg=green}
: ${ZSH_HIGHLIGHT_STYLES[function]:=fg=green}
: ${ZSH_HIGHLIGHT_STYLES[command]:=fg=green}
: ${ZSH_HIGHLIGHT_STYLES[hashed-command]:=fg=green}
: ${ZSH_HIGHLIGHT_STYLES[path]:=underline}
: ${ZSH_HIGHLIGHT_STYLES[globbing]:=fg=blue}
: ${ZSH_HIGHLIGHT_STYLES[history-expansion]:=fg=blue}
: ${ZSH_HIGHLIGHT_STYLES[single-hyphen-option]:=none}
: ${ZSH_HIGHLIGHT_STYLES[double-hyphen-option]:=none}
: ${ZSH_HIGHLIGHT_STYLES[back-quoted-argument]:=none}
: ${ZSH_HIGHLIGHT_STYLES[single-quoted-argument]:=fg=yellow}
: ${ZSH_HIGHLIGHT_STYLES[double-quoted-argument]:=fg=yellow}
: ${ZSH_HIGHLIGHT_STYLES[dollar-double-quoted-argument]:=fg=cyan}
: ${ZSH_HIGHLIGHT_STYLES[back-double-quoted-argument]:=fg=cyan}
: ${ZSH_HIGHLIGHT_STYLES[assign]:=none}
# Tokens that are always immediately followed by a command.
ZSH_HIGHLIGHT_TOKENS_FOLLOWED_BY_COMMANDS=(
'|' '||' ';' '&' '&&' 'noglob' 'nocorrect' 'builtin' 'exec'
)
# Whether the highlighter should be called or not.
_zsh_highlight_main_highlighter_predicate()
{
_zsh_highlight_buffer_modified
}
# Main syntax highlighting function.
_zsh_highlight_main_highlighter()
{
setopt localoptions extendedglob bareglobqual
local start_pos=0 end_pos highlight_glob=true new_expression=true arg style
region_highlight=()
for arg in ${(z)BUFFER}; do
local substr_color=0
[[ $start_pos -eq 0 && $arg = 'noglob' ]] && highlight_glob=false
((start_pos+=${#BUFFER[$start_pos+1,-1]}-${#${BUFFER[$start_pos+1,-1]##[[:space:]]#}}))
((end_pos=$start_pos+${#arg}))
if $new_expression; then
new_expression=false
res=$(LC_ALL=C builtin type -w $arg 2>/dev/null)
case $res in
*': reserved') style=$ZSH_HIGHLIGHT_STYLES[reserved-word];;
*': alias') style=$ZSH_HIGHLIGHT_STYLES[alias]
local aliased_command="${"$(alias $arg)"#*=}"
[[ -n ${(M)ZSH_HIGHLIGHT_TOKENS_FOLLOWED_BY_COMMANDS:#"$aliased_command"} && -z ${(M)ZSH_HIGHLIGHT_TOKENS_FOLLOWED_BY_COMMANDS:#"$arg"} ]] && ZSH_HIGHLIGHT_TOKENS_FOLLOWED_BY_COMMANDS+=($arg)
;;
*': builtin') style=$ZSH_HIGHLIGHT_STYLES[builtin];;
*': function') style=$ZSH_HIGHLIGHT_STYLES[function];;
*': command') style=$ZSH_HIGHLIGHT_STYLES[command];;
*': hashed') style=$ZSH_HIGHLIGHT_STYLES[hashed-command];;
*) if _zsh_highlight_main_highlighter_check_assign; then
style=$ZSH_HIGHLIGHT_STYLES[assign]
new_expression=true
elif _zsh_highlight_main_highlighter_check_path; then
style=$ZSH_HIGHLIGHT_STYLES[path]
elif [[ $arg[0,1] = $histchars[0,1] ]]; then
style=$ZSH_HIGHLIGHT_STYLES[history-expansion]
else
style=$ZSH_HIGHLIGHT_STYLES[unknown-token]
fi
;;
esac
else
case $arg in
'--'*) style=$ZSH_HIGHLIGHT_STYLES[double-hyphen-option];;
'-'*) style=$ZSH_HIGHLIGHT_STYLES[single-hyphen-option];;
"'"*"'") style=$ZSH_HIGHLIGHT_STYLES[single-quoted-argument];;
'"'*'"') style=$ZSH_HIGHLIGHT_STYLES[double-quoted-argument]
region_highlight+=("$start_pos $end_pos $style")
_zsh_highlight_main_highlighter_highlight_string
substr_color=1
;;
'`'*'`') style=$ZSH_HIGHLIGHT_STYLES[back-quoted-argument];;
*"*"*) $highlight_glob && style=$ZSH_HIGHLIGHT_STYLES[globbing] || style=$ZSH_HIGHLIGHT_STYLES[default];;
*) if _zsh_highlight_main_highlighter_check_path; then
style=$ZSH_HIGHLIGHT_STYLES[path]
elif [[ $arg[0,1] = $histchars[0,1] ]]; then
style=$ZSH_HIGHLIGHT_STYLES[history-expansion]
else
style=$ZSH_HIGHLIGHT_STYLES[default]
fi
;;
esac
fi
[[ $substr_color = 0 ]] && region_highlight+=("$start_pos $end_pos $style")
[[ -n ${(M)ZSH_HIGHLIGHT_TOKENS_FOLLOWED_BY_COMMANDS:#"$arg"} ]] && new_expression=true
start_pos=$end_pos
done
}
# Check if the argument is variable assignment
_zsh_highlight_main_highlighter_check_assign()
{
setopt localoptions extended_glob
[[ ${(Q)arg} == [[:alpha:]_]([[:alnum:]_])#=* ]]
}
# Check if the argument is a path.
_zsh_highlight_main_highlighter_check_path()
{
[[ -z ${(Q)arg} ]] && return 1
[[ -e ${(Q)arg} ]] && return 0
[[ ! -e ${(Q)arg:h} ]] && return 1
[[ ${BUFFER[1]} != "-" && ${#BUFFER} == $end_pos && -n $(print ${(Q)arg}*(N)) ]] && return 0
return 1
}
# Highlight special chars inside double-quoted strings
_zsh_highlight_main_highlighter_highlight_string()
{
setopt localoptions noksharrays
local i j k style
# Starting quote is at 1, so start parsing at offset 2 in the string.
for (( i = 2 ; i < end_pos - start_pos ; i += 1 )) ; do
(( j = i + start_pos - 1 ))
(( k = j + 1 ))
case "$arg[$i]" in
'$') style=$ZSH_HIGHLIGHT_STYLES[dollar-double-quoted-argument];;
"\\") style=$ZSH_HIGHLIGHT_STYLES[back-double-quoted-argument]
(( k += 1 )) # Color following char too.
(( i += 1 )) # Skip parsing the escaped char.
;;
*) continue;;
esac
region_highlight+=("$j $k $style")
done
}