Resync the lexers with Scintillua

- Resync the lexers with Scintillua

- Update the lexer readme

- Update `zenburn` theme to fix some highlighting issues

- lexers: redirect print function to vis:info()

- Fix support for custom style names

- As per error message "lexer.delimited_range() is deprecated, use lexer.range()".

- Remove remaining `lexer.delimited_range()` call

- Set syntax to `nil` if the file type has no matching lexer

- Updated Go lexer for Go 1.18.

- lexers/dsv: convert to new lexer format

  (cherry picked from commit 9edbc3cd9ea1d7142b1305840432a3d2739e755a)

- lexers/gemini: disable legacy gemini lexer

  This reverts commit 468f9ee1b027a7ce98b1a249fa1af5888feeb989.

  It is in legacy format and of questionable quality. Ideally it
  should be contributed upstream from where it will eventually
  trickle down to us.

- lexers/git-rebase: convert to new lexer format

  (cherry picked from commit 4000a4cc9ac4a4c2869dfae772b977a82aee8d8c)

- lexers/strace: convert to new lexer format

  (cherry picked from commit e420451320d97eb164f5629c1bcfab0b595be29d)

- lexers/typescript: add new upstream lexer revision 28e2b60

  (cherry picked from commit 7326e6deecdaa75fa94ae9ebdb653f9f907b33f2)

- use `package.searchpath` instead of a local `searchpath` function

- Restore `filetype: support filetype detection via hashbang`

- Remove redundant comment

- Restore gemini lexer

1 files changed, 73 insertions, 112 deletions

diff --git a/lua/lexers/crystal.lua b/lua/lexers/crystal.lua
index 5195387..f8b2211 100644
--- a/lua/lexers/crystal.lua
+++ b/lua/lexers/crystal.lua
@@ -1,141 +1,102 @@
--- Copyright 2006-2017 Mitchell mitchell.att.foicica.com. See LICENSE.
+-- Copyright 2006-2022 Mitchell. See LICENSE.
 -- Copyright 2017 Michel Martens.
 -- Crystal LPeg lexer (based on Ruby).
 
-local l = require('lexer')
-local token, word_match = l.token, l.word_match
-local P, R, S = lpeg.P, lpeg.R, lpeg.S
+local lexer = require('lexer')
+local token, word_match = lexer.token, lexer.word_match
+local P, S = lpeg.P, lpeg.S
 
-local M = {_NAME = 'crystal'}
+local lex = lexer.new('crystal')
 
 -- Whitespace.
-local ws = token(l.WHITESPACE, l.space^1)
+lex:add_rule('whitespace', token(lexer.WHITESPACE, lexer.space^1))
 
--- Comments.
-local line_comment = '#' * l.nonnewline_esc^0
-local comment = token(l.COMMENT, line_comment)
+-- Keywords.
+lex:add_rule('keyword', token(lexer.KEYWORD, word_match{
+  'alias', 'begin', 'break', 'case', 'class', 'def', 'defined?', 'do', 'else', 'elsif', 'end',
+  'ensure', 'false', 'for', 'if', 'in', 'module', 'next', 'nil', 'not', 'redo', 'rescue', 'retry',
+  'return', 'self', 'super', 'then', 'true', 'undef', 'unless', 'until', 'when', 'while', 'yield',
+  '__FILE__', '__LINE__'
+}))
 
-local delimiter_matches = {['('] = ')', ['['] = ']', ['{'] = '}'}
-local literal_delimitted = P(function(input, index)
-  local delimiter = input:sub(index, index)
-  if not delimiter:find('[%w\r\n\f\t ]') then -- only non alpha-numerics
-    local match_pos, patt
-    if delimiter_matches[delimiter] then
-      -- Handle nested delimiter/matches in strings.
-      local s, e = delimiter, delimiter_matches[delimiter]
-      patt = l.delimited_range(s..e, false, false, true)
-    else
-      patt = l.delimited_range(delimiter)
-    end
-    match_pos = lpeg.match(patt, input, index)
-    return match_pos or #input + 1
-  end
-end)
+-- Functions.
+lex:add_rule('function', token(lexer.FUNCTION, word_match{
+  'abort', 'at_exit', 'caller', 'delay', 'exit', 'fork', 'future', 'get_stack_top', 'gets', 'lazy',
+  'loop', 'main', 'p', 'print', 'printf', 'puts', 'raise', 'rand', 'read_line', 'require', 'sleep',
+  'spawn', 'sprintf', 'system', 'with_color',
+  -- Macros.
+  'assert_responds_to', 'debugger', 'parallel', 'pp', 'record', 'redefine_main'
+}) * -S('.:|'))
+
+-- Identifiers.
+local word_char = lexer.alnum + S('_!?')
+local word = (lexer.alpha + '_') * word_char^0
+lex:add_rule('identifier', token(lexer.IDENTIFIER, word))
+
+-- Comments.
+lex:add_rule('comment', token(lexer.COMMENT, lexer.to_eol('#', true)))
 
 -- Strings.
-local cmd_str = l.delimited_range('`')
-local sq_str = l.delimited_range("'")
-local dq_str = l.delimited_range('"')
+local cmd_str = lexer.range('`')
+local sq_str = lexer.range("'")
+local dq_str = lexer.range('"')
 local heredoc = '<<' * P(function(input, index)
-  local s, e, indented, _, delimiter =
-    input:find('(%-?)(["`]?)([%a_][%w_]*)%2[\n\r\f;]+', index)
-  if s == index and delimiter then
-    local end_heredoc = (#indented > 0 and '[\n\r\f]+ *' or '[\n\r\f]+')
-    local _, e = input:find(end_heredoc..delimiter, e)
-    return e and e + 1 or #input + 1
-  end
+  local _, e, indented, _, delimiter = input:find('^(%-?)(["`]?)([%a_][%w_]*)%2[\n\r\f;]+', index)
+  if not delimiter then return end
+  local end_heredoc = (#indented > 0 and '[\n\r\f]+ *' or '[\n\r\f]+')
+  _, e = input:find(end_heredoc .. delimiter, e)
+  return e and e + 1 or #input + 1
 end)
+local string = token(lexer.STRING, (sq_str + dq_str + heredoc + cmd_str) * S('f')^-1)
 -- TODO: regex_str fails with `obj.method /patt/` syntax.
-local regex_str = #P('/') * l.last_char_includes('!%^&*([{-=+|:;,?<>~') *
-                  l.delimited_range('/', true, false) * S('iomx')^0
-local string = token(l.STRING, (sq_str + dq_str + heredoc + cmd_str) *
-                               S('f')^-1) +
-               token(l.REGEX, regex_str)
-
-local word_char = l.alnum + S('_!?')
+local regex_str =
+  #P('/') * lexer.last_char_includes('!%^&*([{-=+|:;,?<>~') * lexer.range('/', true) * S('iomx')^0
+local regex = token(lexer.REGEX, regex_str)
+lex:add_rule('string', string + regex)
 
 -- Numbers.
-local dec = l.digit^1 * ('_' * l.digit^1)^0 * S('ri')^-1
+local dec = lexer.digit^1 * ('_' * lexer.digit^1)^0 * S('ri')^-1
 local bin = '0b' * S('01')^1 * ('_' * S('01')^1)^0
-local integer = S('+-')^-1 * (bin + l.hex_num + l.oct_num + dec)
+local integer = S('+-')^-1 * (bin + lexer.hex_num + lexer.oct_num + dec)
 -- TODO: meta, control, etc. for numeric_literal.
-local numeric_literal = '?' * (l.any - l.space) * -word_char
-local number = token(l.NUMBER, l.float * S('ri')^-1 + integer + numeric_literal)
-
--- Keywords.
-local keyword = token(l.KEYWORD, word_match({
-  'alias', 'begin', 'break', 'case', 'class', 'def', 'defined?', 'do', 'else',
-  'elsif', 'end', 'ensure', 'false', 'for', 'if', 'in', 'module', 'next', 'nil',
-  'not', 'redo', 'rescue', 'retry', 'return', 'self', 'super', 'then', 'true',
-  'undef', 'unless', 'until', 'when', 'while', 'yield', '__FILE__', '__LINE__'
-}, '?!'))
-
--- Functions.
-local func = token(l.FUNCTION, word_match({
-  'abort', 'at_exit', 'caller', 'delay', 'exit', 'fork', 'future',
-  'get_stack_top', 'gets', 'lazy', 'loop', 'main', 'p', 'print', 'printf',
-  'puts', 'raise', 'rand', 'read_line', 'require', 'sleep', 'spawn', 'sprintf',
-  'system', 'with_color',
-  -- Macros
-  'assert_responds_to', 'debugger', 'parallel', 'pp', 'record', 'redefine_main'
-}, '?!')) * -S('.:|')
-
--- Identifiers.
-local word = (l.alpha + '_') * word_char^0
-local identifier = token(l.IDENTIFIER, word)
+local numeric_literal = '?' * (lexer.any - lexer.space) * -word_char
+lex:add_rule('number', token(lexer.NUMBER, lexer.float * S('ri')^-1 + integer + numeric_literal))
 
 -- Variables.
-local global_var = '$' * (word + S('!@L+`\'=~/\\,.;<>_*"$?:') + l.digit + '-' *
-                   S('0FadiIKlpvw'))
+local global_var = '$' *
+  (word + S('!@L+`\'=~/\\,.;<>_*"$?:') + lexer.digit + '-' * S('0FadiIKlpvw'))
 local class_var = '@@' * word
 local inst_var = '@' * word
-local variable = token(l.VARIABLE, global_var + class_var + inst_var)
+lex:add_rule('variable', token(lexer.VARIABLE, global_var + class_var + inst_var))
 
 -- Symbols.
-local symbol = token('symbol', ':' * P(function(input, index)
+lex:add_rule('symbol', token('symbol', ':' * P(function(input, index)
   if input:sub(index - 2, index - 2) ~= ':' then return index end
-end) * (word_char^1 + sq_str + dq_str))
+end) * (word_char^1 + sq_str + dq_str)))
+lex:add_style('symbol', lexer.styles.constant)
 
 -- Operators.
-local operator = token(l.OPERATOR, S('!%^&*()[]{}-=+/|:;.,?<>~'))
-
-M._rules = {
-  {'whitespace', ws},
-  {'keyword', keyword},
-  {'function', func},
-  {'identifier', identifier},
-  {'comment', comment},
-  {'string', string},
-  {'number', number},
-  {'variable', variable},
-  {'symbol', symbol},
-  {'operator', operator},
-}
-
-M._tokenstyles = {
-  symbol = l.STYLE_CONSTANT
-}
+lex:add_rule('operator', token(lexer.OPERATOR, S('!%^&*()[]{}-=+/|:;.,?<>~')))
 
+-- Fold points.
 local function disambiguate(text, pos, line, s)
-  return line:sub(1, s - 1):match('^%s*$') and
-         not text:sub(1, pos - 1):match('\\[ \t]*\r?\n$') and 1 or 0
+  return line:sub(1, s - 1):match('^%s*$') and not text:sub(1, pos - 1):match('\\[ \t]*\r?\n$') and
+    1 or 0
 end
-
-M._foldsymbols = {
-  _patterns = {'%l+', '[%(%)%[%]{}]', '#'},
-  [l.KEYWORD] = {
-    begin = 1, class = 1, def = 1, ['do'] = 1, ['for'] = 1, ['module'] = 1,
-    case = 1,
-    ['if'] = disambiguate, ['while'] = disambiguate,
-    ['unless'] = disambiguate, ['until'] = disambiguate,
-    ['end'] = -1
-  },
-  [l.OPERATOR] = {
-    ['('] = 1, [')'] = -1, ['['] = 1, [']'] = -1, ['{'] = 1, ['}'] = -1
-  },
-  [l.COMMENT] = {
-    ['#'] = l.fold_line_comments('#')
-  }
-}
-
-return M
+lex:add_fold_point(lexer.KEYWORD, 'begin', 'end')
+lex:add_fold_point(lexer.KEYWORD, 'case', 'end')
+lex:add_fold_point(lexer.KEYWORD, 'class', 'end')
+lex:add_fold_point(lexer.KEYWORD, 'def', 'end')
+lex:add_fold_point(lexer.KEYWORD, 'do', 'end')
+lex:add_fold_point(lexer.KEYWORD, 'for', 'end')
+lex:add_fold_point(lexer.KEYWORD, 'module', 'end')
+lex:add_fold_point(lexer.KEYWORD, 'if', disambiguate)
+lex:add_fold_point(lexer.KEYWORD, 'while', disambiguate)
+lex:add_fold_point(lexer.KEYWORD, 'unless', disambiguate)
+lex:add_fold_point(lexer.KEYWORD, 'until', disambiguate)
+lex:add_fold_point(lexer.OPERATOR, '(', ')')
+lex:add_fold_point(lexer.OPERATOR, '[', ']')
+lex:add_fold_point(lexer.OPERATOR, '{', '}')
+lex:add_fold_point(lexer.COMMENT, lexer.fold_consecutive_lines('#'))
+
+return lex