510 lines
11 KiB
Bash
510 lines
11 KiB
Bash
#!/bin/dash
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log notice "running"
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# segmented-path
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# segment
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# Syntax scheme:
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#
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# hemar
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# elements
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#
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# elements
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# element
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# element elements
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#
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# element
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# tag
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# text
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#
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# text
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# text-item
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# text-item text
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#
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# text-item
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# '0020' . '10FFFF' - '{'
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# nopatern
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#
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# tag
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# '{[' ws path ws ']}'
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# '{[' ws for ws ']}'
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# '{[' ws "done" ws ']}'
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# '{[' ws '{[' ws ']}'
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#
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# # loop tag
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# for
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# "for" ws string ws "in" ws path
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#
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# # path
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# path
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# '.'
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# segmented-path
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#
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# segmented-path
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# segment
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# segment '.' segmented-path
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#
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# segment
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# string
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# index
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#
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# index
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# '[' digit ']'
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# '[' onenine digits ']'
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# '[' '-' onenine ']'
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# '[' '-' onenine digits ']'
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#
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# # types
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# string
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# unquoted-string
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# quoted-string
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#
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# unquoted-string
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# unquoted-character
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# unquoted-character quoted-string
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#
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# unquoted-character
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# '0020' . '10FFFF' - '"' - '\' - '.' - '[' - ']' - '{' - '}'
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#
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# quoted-string
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# unquoted-character
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# unquoted-character string
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#
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# quoted-character
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# '0000' . '10FFFF' - '"'
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# '"' '"'
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#
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# digits
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# digit
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# digit digits
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#
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# digit
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# '0'
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# onenine
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#
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# onenine
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# '1' . '9'
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#
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# # paterns
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# ws
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# ''
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# '\x20' ws
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# '\x0a' ws
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# '\x0d' ws
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# '\x09' ws
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#
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# nopatern
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# '{' '0020' . '10FFFF' - '['
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# AST Plex:
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#
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# Type = 0..=5
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#
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# Text = string # just a text body
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#
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# Interpolation = string # path to variable
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#
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# Section = {
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# v = string # item variable name for loop
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# p = string # path to array for iteration
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# b = [Element] # section body
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#
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# }
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#
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# End = null
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#
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# Compute = {
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# l = string # programing language
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# b = string # function body
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# }
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#
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# Element = {
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# t = Type # element type
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# b = Text # element body
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# | Interpolation
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# | Section
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# | End
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# | Include
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# | Compute
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# }
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#
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# AbstarctSyntaxTree (ATS) = {
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# e = [Element] # elements array
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# }
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AST=$(mktemp)
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AST_key='.'
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trap 'rm -f "$AST"' EXIT INT HUP
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yq -o j -i '.' "$AST"
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log debug "AST path: ${WHITE}${AST}"
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# 0 - text
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# 1 - deside tag type
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# 2 - interpolation
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# 3 - section
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# 4 - include
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# 5 - compute
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STAGE=0
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# is_ws(char) -> bool
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is_ws() {
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ord=$(printf '%d' "'$1")
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case $ord in
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32|10|13|9) # <-> \x20 | \x0a | \x0d | \x09 <-> space | \n | \r | \t
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return 0
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;;
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esac
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return 1
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}
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log_buffers() {
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log debug "buff 1: $WHITE$(cat "$STAGE_BUFFER_1")"
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}
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# remove_last_double_quote(text) -> text
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remove_last_double_quote() {
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printf '%s' "$1" | sed 's/\(.*\)"\(.*\)/\1\2/'
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}
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#buf_read(buf?) -> text
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buf_read() {
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local buf
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if [ ${1+x} ]; then
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buf=${1}
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else
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buf=${CURRENT_STAGE_BUFFER}
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fi
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cat "$buf"
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}
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buf_reset() {
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: > "$STAGE_BUFFER_1"
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CURRENT_STAGE_BUFFER="$STAGE_BUFFER_1"
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}
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STAGE_BUFFER_1="$(mktemp)"
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CURRENT_STAGE_BUFFER=$STAGE_BUFFER_1
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trap 'rm -f "$STAGE_BUFFER_1"' EXIT INT HUP
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log debug "stage buffer 1: ${WHITE}$STAGE_BUFFER_1"
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# json_escape(value) -> str
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json_escape() {
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# TODO: escape functionality
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printf '%s' "${1}" | sed 's/"/\\"/g'
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}
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# finds close pattern and store the char to the stage buffers separating by spaces
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parse_tag() {
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local char="${1:?}"
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# NOTE: any return 1 - skip char, regular_char + return 1 - write char
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# TAG_seen_first_ws - we've already handled the first whitespace after `{[...]`
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# TAG_in_ws_run - we’re currently in a run of whitespace chars
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# TAG_pending_close - we saw `]` and are checking if the next char is `}`
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string_grammar() {
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if [ "${TAG_in_quoted_string+x}" ]; then
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if [ "${TAG_end_quote_pending+x}" ]; then
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case "$char" in
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'"')
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unset TAG_end_quote_pending
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;;
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'.')
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TAG_dote=1
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return 1
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;;
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*) log error "unexpected end of quote on $WHITE$LINE_N$NC:$WHITE$CHAR_N" ;;
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esac
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elif [ "$char" = '"' ]; then
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TAG_end_quote_pending=1
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return 1
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fi
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else
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# shellcheck disable=SC1003
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case "$char" in
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'['|']'|'{'|'}'|'"'|'\')
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log error "not allowed character $WHITE$char$NC on $WHITE$LINE_N$NC:$WHITE$CHAR_N"
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log error "try to use quoted string"
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;;
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'.')
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TAG_dote=1
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return 1
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;;
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esac
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fi
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}
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write_char() {
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[ ${TAG_next_argument_redgect+x} ] && {
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log error "too many argument for tag type $WHITE${TAG_type:?}$NC on $WHITE$LINE_N$NC:$WHITE$CHAR_N$NC";
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exit 1;
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}
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[ ${TAG_in_ws_run+x} ] && {
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unset TAG_in_ws_run
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if [ "${TAG_seen_first_ws+x}" ]; then
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case "${TAG_type:-unknown}" in
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unknown) finalize_first_arg ;;
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for)
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# NOTE:
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# grammar: for i in key."subkey" ; so we know
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# 1st argument after `for` - string (name of variable)
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# 2nd - 'in' (just keyword)
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# 3rd - path (path to array in Model)
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case ${TAG_grammar_mode:-1} in
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string)
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;;
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kw_in)
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;;
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path)
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;;
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esac
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;;
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*) log panic 'unexpected TAG_type'; exit 13; ;;
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esac
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# NOTE: prepare to next argument
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buf_reset
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else
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TAG_seen_first_ws=1
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fi
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}
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printf '%s' "$1" >> "$CURRENT_STAGE_BUFFER"
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}
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if [ ! "${TAG_pending_close+x}" ] && [ "$char" = ']' ]; then
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TAG_pending_close=1
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# NOTE: skip ']' but remember to check next char for a possible '}'
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return 1
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elif [ "${TAG_pending_close+x}" ]; then
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unset TAG_pending_close
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if [ "$char" = '}' ]; then
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# NOTE: found `]}` — finish bracket parsing
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return 0
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else
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# NOTE: `]` was not followed by `}`, so emit the `]` we skipped
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printf ']' >> "$CURRENT_STAGE_BUFFER"
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fi
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else
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is_ws "$char" && { TAG_in_ws_run=1; return 1; }
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fi
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case "${TAG_grammar_mode:-unknown}" in
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unknown)
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# NOTE: we always know grammar mode but first argument
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# just regular parse as string or as path if seen unquoted '.'
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# NOTE: this is after char's checked on ws
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# so if TAG_in_ws_run exists then this is first char in argument (just after ws)
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[ "${TAG_dote+x}" ] && { log panic "TAG_dote true in unknown TAG_grammar_mode"; exit 13; }
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if [ "${TAG_in_ws_run+x}" ] && [ "$char" = '"' ]; then
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[ "${TAG_in_quoted_string+x}" ] && { log panic "TAG_in_quoted_string already true right after ws"; exit 13; }
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TAG_in_quoted_string=1
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return 1
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fi
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string_grammar || return 1
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if [ ${TAG_dote+x} ]; then
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TAG_grammar_mode=path
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fi
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;;
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path)
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if [ "${TAG_dote+x}" ]; then
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log notice "suka"
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fi
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if [ "${TAG_in_ws_run+x}" ] && [ "$char" = '"' ] || [ "${TAG_dote+x}" ] && [ "$char" = '"' ]; then
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[ "${TAG_in_quoted_string+x}" ] && { log panic "TAG_in_quoted_string already true right after ws"; exit 13; }
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unset TAG_dote
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TAG_in_quoted_string=1
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return 1
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fi
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[ "${TAG_dote+x}" ] && unset TAG_dote
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string_grammar || return 1
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;;
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string)
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if [ "${TAG_in_ws_run+x}" ] && [ "$char" = '"' ]; then
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[ "${TAG_in_quoted_string+x}" ] && { log panic "TAG_in_quoted_string already true right after ws"; exit 13; }
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TAG_in_quoted_string=1
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return 1
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fi
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string_grammar || return 1
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if [ ${TAG_dote+x} ]; then
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log error ". not allowed, use quote to escape it; on $WHITE$LINE_N$NC:$WHITE$CHAR_N$NC"
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fi
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;;
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kw_in)
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;;
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*) log panic 'unexpected TAG_grammar_mode'; exit 13; ;;
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esac
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write_char "$char"
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return 1
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}
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finalize_first_arg() {
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case "$(cat "$CURRENT_STAGE_BUFFER")" in
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for)
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TAG_type='for'
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# NOTE: we know that next argument after `for` is string
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TAG_grammar_mode=string
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log error 'for unimplemented'
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exit 13
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;;
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done)
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TAG_type='done'
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TAG_next_argument_redgect=1
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# NOTE: Do not save {[ done ]} to the AST becouse it is useless there
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;;
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'{[')
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TAG_type='actual bracket'
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TAG_next_argument_redgect=1
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if yq -e "${AST_key}[-1].type == \"text\"" "$AST" > /dev/null; then
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yq -o j -i "${AST_key}[-1].value += \"{[\"" "$AST"
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else
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yq -o j -i "$AST_key += [{
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\"type\": \"text\",
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\"value\": \"{[\"
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}]" "$AST"
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fi
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;;
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*) # interpolation tag
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TAG_type='interpolation'
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TAG_next_argument_redgect=1
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buf=$(cat "$STAGE_BUFFER_1")
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yq -o j -i "$AST_key += [{
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\"type\": \"interpolation\",
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\"path\": \"$(json_escape "$buf")\"
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}]" "$AST"
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;;
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esac
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}
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# finds open pattern and stores the char to the STAGE_BUFFER_1
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find_open_pattern() {
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local char="${1:?}"
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if [ ! "${open_tag_flag+x}" ] && [ "$char" = '{' ]; then
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open_tag_flag=1
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elif [ "${open_tag_flag+x}" ]; then
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unset open_tag_flag
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if [ "$char" = '[' ]; then
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return 0
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else
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printf '{%s' "$char" >> "$CURRENT_STAGE_BUFFER"
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fi
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else
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printf '%s' "$char" >> "$CURRENT_STAGE_BUFFER"
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fi
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return 1
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}
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parse() {
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char="$1"
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case "$STAGE" in
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# Text Stage - save char in STAGE_BUFFER_1 until next tag opens
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0)
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if find_open_pattern "$char"; then
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log debug "open pattern founded"
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buf=$(cat "$CURRENT_STAGE_BUFFER")
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yq -o j -i "$AST_key += [{
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\"type\": \"text\",
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\"value\": \"$(json_escape "$buf")\"
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}]" "$AST"
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buf_reset
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STAGE=1
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fi
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;;
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1)
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if parse_tag "$char"; then
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log_buffers
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# zero-initialization
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buf_reset
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STAGE=1
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fi
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;;
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2)
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;;
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3)
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;;
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4)
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;;
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*)
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log error "error: ${WHITE}impossible stage"
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exit 13
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;;
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esac
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}
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while [ $# -gt 0 ]; do
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case $1 in
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-c|--compact-output)
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OUTPUT_ARGS="${OUTPUT_ARGS+$OUTPUT_ARGS }-I=0"
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shift
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;;
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--*|-*)
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log error "argument $1 does not exists"
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exit 9
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;;
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*)
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log error "subcommand $1 does not exists"
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exit 9
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;;
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esac
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done
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CHAR_N=1
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LINE_N=1
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#LINE_NUMBER=1
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while :; do
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# read exactly 1 byte; preserve newlines
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if ! char="$(dd bs=1 count=1 2>/dev/null)"; then
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break
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fi
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# NOTE: if $char is empty, it because `dd` returned '\n' but `$(...)`
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# removed it as trailing '\n', so I set $char as '\n' here
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[ -z "$char" ] && {
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LINE_N=$((LINE_N+1))
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char='
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'
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}
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parse "${char:?}"
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CHAR_N=$((CHAR_N+1))
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done
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# finish TEXT tag if file ends on it
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if [ "$STAGE" -eq 0 ]; then
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if [ "${open_tag_flag+x}" ]; then
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unset open_tag_flag
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printf '{' >> "$STAGE_BUFFER_1"
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fi
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buf=$(cat "$STAGE_BUFFER_1")
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yq -o j -i "$AST_key += [{
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\"type\": \"text\",
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\"value\": \"$(json_escape "$buf")\"
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}]" "$AST"
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fi
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# return the output
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# shellcheck disable=SC2086
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yq ${OUTPUT_ARGS:-} -o j "$AST"
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