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DEFAULT_INDENT = ' '
adjust_space = (line) ->
string_list = line.match /(['"])[^\1]*?\1/g
muli_string = line.match /\[(=*)\[([^\]\1\]]*)/
comment = line.match /\-{2}[^\[].*$/
line = line.replace /\s+/g, ' '
# replace all whitespaces inside the string with one space, WARNING: the whitespaces in string will be replace too!
line = line.replace /\s?(==|>=|<=|~=|[=><\+\*\/])\s?/g, ' $1 '
# add whitespace around the operator
line = line.replace /([^=e\-\(\s])\s?\-\s?([^\-\[])/g, '$1 - $2'
line = line.replace /([^\d])e\s?\-\s?([^\-\[])/g, '$1e - $2'
# just format minus, not for -- or negative number or commentary.
line = line.replace /,([^\s])/g, ', $1'
# adjust ','
line = line.replace /\s+,/g, ','
# recover the whitespaces in string.
line = line.replace /(['"])[^\1]*?\1/g, ->
string_list.shift()
if muli_string and muli_string[0]
line = line.replace /\[(=*)\[([^\]\1\]]*)/, muli_string[0]
if comment and comment[0]
line = line.replace /\-{2}[^\[].*$/, comment[0]
line
DEFAULT_WARN_FN = (msg) ->
console.log('WARNING:', msg)
module.exports = (str, indent, warn_fn, opts = {}) ->
eol = opts?.eol or '\n'
indent = indent or DEFAULT_INDENT
warn_fn = if typeof warn_fn == 'function' then warn_fn else DEFAULT_WARN_FN
indent = ' '.repeat(indent) if Number.isInteger(indent)
$currIndent = 0
$nextIndent = 0
$prevLength = 0
$extIndent = 0
$lastIndent = 0
$template = 0
new_code = str.split(/\r?\n/g).map (line, line_number) ->
$template_flag = false
if $template
res2 = line.match(/\](=*)\]/)
if res2 and $template == res2[1].length + 1
$template_flag = true
if $template and !/]=*]$/.test(line)
arr = line.split(/\]=*\]/, 2)
comment = arr[0]
code = arr[1]
line = comment + ']' + '='.repeat($template - 1) + ']' + adjust_space(code)
$template = 0
$template = 0
else
return line
res1 = line.match(/\[(=*)\[/)
if res1 and (not new RegExp("\\]#{'='.repeat res1[1].length}\\]").test line)
$template = res1[1].length + 1
if !$template_flag
line = line.trim()
# remote all spaces on both ends
line = adjust_space(line)
if !line.length
return ''
raw_line = line
line = line.replace(/(['"])[^\1]*?\1/g, '')
# remove all quoted fragments for proper bracket processing
line = line.replace(/\s*--.+$/, '')
# remove all comments; this ignores long bracket style comments
if /^((local )?function|repeat|while)\b/.test(line) and !/\bend\s*[\),;]*$/.test(line) or /\b(then|do)$/.test(line) and !/^elseif\b/.test(line) or /^if\b/.test(line) and /\bthen\b/.test(line) and !/\bend$/.test(line) or /\bfunction ?(?:\w+ )?\([^\)]*\)$/.test(line) and !/\bend$/.test(line)
$nextIndent = $currIndent + 1
else if /^until\b/.test(line) or /^end\s*[\),;]*$/.test(line) or /^end\s*\)\s*\.\./.test(line) or /^else(if)?\b/.test(line) and /\bend$/.test(line)
$nextIndent = --$currIndent
else if /^else\b/.test(line) or /^elseif\b/.test(line)
$nextIndent = $currIndent
$currIndent = $currIndent - 1
$brackets = (line.match(/\(/g) or []).length - ((line.match(/\)/g) or []).length)
# capture unbalanced brackets
$curly = (line.match(/\{/g) or []).length - ((line.match(/\}/g) or []).length)
# capture unbalanced curly brackets
# close (curly) brackets if needed
if $curly < 0
$currIndent += $curly
if $brackets < 0
$currIndent += $brackets
$nextIndent += $brackets + $curly
# console.log({last: $lastIndent, curr: $currIndent, next: $nextIndent, ext: $extIndent})
if $currIndent - $lastIndent > 1
$extIndent += $nextIndent - $lastIndent - 1
$nextIndent = $currIndent = 1 + $lastIndent
if $currIndent - $lastIndent < -1 and $extIndent > 0
$extIndent += $currIndent - $lastIndent + 1
$currIndent = -1 + $lastIndent
if $nextIndent < $currIndent
$nextIndent = $currIndent
# console.log({last: $lastIndent, curr: $currIndent, next: $nextIndent, ext: $extIndent})
warn_fn """negative indentation at line #{line_number}: #{raw_line}""" if $currIndent < 0
new_line = (if raw_line.length and $currIndent > 0 and !$template_flag then indent.repeat($currIndent) else '') + raw_line
$useful = $prevLength > 0 or raw_line.length > 0
$lastIndent = $currIndent
$currIndent = $nextIndent
$prevLength = raw_line.length
new_line or undefined
warn_fn 'positive indentation at the end' if $currIndent > 0
new_code.join eol