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'main': optimization that in my tests shows 2.7s -> 2.2s

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Consider indexing long buffers (say 300 chars). E.g. following line:
      integer offset=${${buf[start_pos+1,len]}[(i)$needle]}
will gradually go into large indices for first index [a,] and be kept
at large index for second index [,b]. Instead, we can remove already
processed characters from buf:
    proc_buf="${proc_buf[offset + $#arg + 1,-1]}"
$offset and $#arg are small, first index will not be large. $proc_buf
will be smaller and smaller and the second index [,-1] will run shorter
and shorter.
This commit is contained in:
Sebastian Gniazdowski 2016-05-12 17:22:57 +02:00 committed by Daniel Shahaf
parent 2176692704
commit 02229ebd63
1 changed files with 17 additions and 3 deletions
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20
highlighters/main/main-highlighter.zsh
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@ -199,6 +199,8 @@ _zsh_highlight_main_highlighter()
#
local this_word=':start:' next_word
integer in_redirection
# Processing buffer
local proc_buf="$buf"
for arg in ${interactive_comments-${(z)buf}} \
${interactive_comments+${(zZ+c+)buf}}; do
if (( in_redirection )); then
@ -234,14 +236,26 @@ _zsh_highlight_main_highlighter()
# indistinguishable from 'echo foo echo bar' (one command with three
# words for arguments).
local needle=$'[;\n]'
integer offset=${${buf[start_pos+1,len]}[(i)$needle]}
(( start_pos += offset - 1 ))
integer offset=$(( ${proc_buf[(i)$needle]} - 1 ))
(( start_pos += offset ))
(( end_pos = start_pos + $#arg ))
else
((start_pos+=(len-start_pos)-${#${${buf[start_pos+1,len]}##([[:space:]]|\\[[:space:]])#}}))
integer offset=$(((len-start_pos)-${#${proc_buf##([[:space:]]|\\[[:space:]])#}}))
((start_pos+=offset))
((end_pos=$start_pos+${#arg}))
fi
# Above `if` computes new start_pos and end_pos.
# Here we compute new proc_buf. We advance it
# (chop off characters from the beginning)
# beyond what end_pos points to, by skipping
# as many characters as end_pos was advanced.
#
# end_pos was advanced by $offset (via start_pos)
# and by $#arg. Note the `start_pos=$end_pos`
# below.
proc_buf="${proc_buf[offset + $#arg + 1,-1]}"
if [[ -n ${interactive_comments+'set'} && $arg[1] == $histchars[3] ]]; then
if [[ $this_word == *(':regular:'|':start:')* ]]; then
style=comment