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#!/usr/bin/env bash
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export black=$'\e[30m'
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export red=$'\e[31m'
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export green=$'\e[32m'
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export yellow=$'\e[33m'
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export blue=$'\e[34m'
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export magenta=$'\e[35m'
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export cyan=$'\e[36m'
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export white=$'\e[37m'
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export reset=$'\e[0m'
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# Minimal packrat parsing expression grammar (PEG):
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#
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# Mark <- Span* !.
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# Span <- StrongEm / Strong / Emphasis / Link / Code / Plain
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# StrongEm <- '***' .* '***'
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# Strong <- '**' .* '**'
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# Emphasis <- '*' .* '*'
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# Link <- '<' .* '>'
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# Code <- '`' .* '`'
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# Plain <- DQUOTE / QUOTE / LARROW / RARROW / ELLIPSIS / .*
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# DQUOTE <- '"'
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# QUOTE <- "'"
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# LARROW <- " <- "
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# RARROW <- " -> "
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# ELLIPSIS <- '...'
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#
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# There's no character escape support because it isn't needed for most
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# all use cases here.
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export md_strongem=$red # ***strongem***
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export md_strong=$yellow # **strong**
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export md_emphasis=$magenta # *emphasis*
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export md_code=$cyan # `code`
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export md_plain='' # plain
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mark () {
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declare inemphasis instrong instrongem incode indquote inquote inlink i
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# The main content is almost always within single quotes to prevent
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# shell expansions, but we'll combine the remaining arguments anyway for
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# convenience (like echo does).
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declare buf=$*
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# Recursive descent parser
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for (( i=0; i<${#buf}; i++ )); do
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if [[ -z "$instrongem" &&
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-z "$instrong" &&
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-z "$inemphasis" &&
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-z "$incode" ]]; then
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echo -n "$reset"
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fi
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# ***strongem***
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if [[ "${buf:$i:3}" = '***' ]]; then
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if [[ -z "$instrongem" ]]; then
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echo -n "$md_strongem"
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#echo -n '<strongem>'
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instrongem=1
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else
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#echo -n '</strongem>'
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echo -n $defsol
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instrongem=''
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fi
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i=$[i+2]
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continue
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fi
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# **strong**
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if [[ "${buf:$i:2}" = '**' ]]; then
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if [[ -z "$instrong" ]]; then
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echo -n "$md_strong"
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#echo -n '<strong>'
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instrong=y
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else
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#echo -n '</strong>'
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echo -n $defsol
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instrong=''
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fi
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i=$[i+1]
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continue
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fi
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# *emphasis*
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if [[ "${buf:$i:1}" = '*' ]]; then
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if [[ -z "$inemphasis" ]]; then
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echo -n "$md_emphasis"
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#echo -n '<emphasis>'
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inemphasis=y
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else
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#echo -n '</emphasis>'
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echo -n $defsol
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inemphasis=''
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fi
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continue
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fi
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# `code`
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if [[ "${buf:$i:1}" = '`' ]]; then
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if [[ -z "$incode" ]]; then
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echo -n "$md_code"
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#echo -n '<code>'
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incode=y
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else
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#echo -n '</code>'
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echo -n $defsol
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incode=''
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fi
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continue
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fi
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# "
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if [[ "${buf:$i:1}" = '"' ]]; then
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if [[ -z "$indquote" ]]; then
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echo -n '“'
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indquote=y
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else
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echo -n '”'
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indquote=''
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fi
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continue
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fi
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# '
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if [[ "${buf:$i:1}" = "'" ]]; then
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if [[ -z "$inquote" ]]; then
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echo -n '‘'
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inquote=y
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else
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echo -n '’'
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inquote=''
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fi
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continue
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fi
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# <-
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if [[ "${buf:$i:4}" = ' <- ' ]]; then
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echo -n " ← "
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i=$[i+3]
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continue
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fi
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# ->
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if [[ "${buf:$i:4}" = ' -> ' ]]; then
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echo -n " → "
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i=$[i+3]
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continue
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fi
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# ...
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if [[ "${buf:$i:3}" = '...' ]]; then
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echo -n "…"
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i=$[i+2]
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continue
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fi
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# <link>
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if [[ "${buf:$i:1}" = '<' ]]; then
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if [[ -z "$inlink" ]]; then
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echo -n $md_code${buf:$i:1}
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#echo -n '<link>'
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inlink=y
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fi
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continue
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fi
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if [[ "${buf:$i:1}" = '>' ]]; then
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if [[ -n "$inlink" ]]; then
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#echo -n '</link>'
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echo -n ${buf:$i:1}$defsol
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inlink=''
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fi
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continue
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fi
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echo -n "${buf:$i:1}"
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done
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echo -n $reset
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}
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mark "$@"
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