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, 30 insertions, 44 deletions

diff --git a/lua/lexers/pure.lua b/lua/lexers/pure.lua
index 56f002d..35e8a48 100644
--- a/lua/lexers/pure.lua
+++ b/lua/lexers/pure.lua
@@ -1,62 +1,48 @@
--- Copyright 2015-2017 David B. Lamkins <david@lamkins.net>. See LICENSE.
+-- Copyright 2015-2022 David B. Lamkins <david@lamkins.net>. See LICENSE.
 -- pure LPeg lexer, see http://purelang.bitbucket.org/
 
-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 = 'pure'}
+local lex = lexer.new('pure')
 
 -- 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^0
-local block_comment = '/*' * (l.any - '*/')^0 * P('*/')^-1
-local comment = token(l.COMMENT, line_comment + block_comment)
+-- Keywords.
+lex:add_rule('keyword', token(lexer.KEYWORD, word_match{
+  'namespace', 'with', 'end', 'using', 'interface', 'extern', 'let', 'const', 'def', 'type',
+  'public', 'private', 'nonfix', 'outfix', 'infix', 'infixl', 'infixr', 'prefix', 'postfix', 'if',
+  'otherwise', 'when', 'case', 'of', 'then', 'else'
+}))
+
+-- Identifiers.
+lex:add_rule('identifier', token(lexer.IDENTIFIER, lexer.word))
 
 -- Strings.
-local string = token(l.STRING, l.delimited_range('"', true))
+lex:add_rule('string', token(lexer.STRING, lexer.range('"', true)))
+
+-- Comments.
+local line_comment = lexer.to_eol('//')
+local block_comment = lexer.range('/*', '*/')
+lex:add_rule('comment', token(lexer.COMMENT, line_comment + block_comment))
 
 -- Numbers.
 local bin = '0' * S('Bb') * S('01')^1
-local hex = '0' * S('Xx') * (R('09') + R('af') + R('AF'))^1
-local dec = R('09')^1
+local hex = lexer.hex_num
+local dec = lexer.dec_num
 local int = (bin + hex + dec) * P('L')^-1
-local rad = P('.') - P('..')
+local rad = P('.') - '..'
 local exp = (S('Ee') * S('+-')^-1 * int)^-1
 local flt = int * (rad * dec)^-1 * exp + int^-1 * rad * dec * exp
-local number = token(l.NUMBER, flt + int)
+lex:add_rule('number', token(lexer.NUMBER, flt + int))
 
--- Keywords.
-local keyword = token(l.KEYWORD, word_match{
-  'namespace', 'with', 'end', 'using', 'interface', 'extern', 'let', 'const',
-  'def', 'type', 'public', 'private', 'nonfix', 'outfix', 'infix', 'infixl',
-  'infixr', 'prefix', 'postfix', 'if', 'otherwise', 'when', 'case', 'of',
-  'then', 'else'
-})
-
--- Identifiers.
-local identifier = token(l.IDENTIFIER, l.word)
+-- Pragmas.
+local hashbang = lexer.starts_line('#!') * (lexer.nonnewline - '//')^0
+lex:add_rule('pragma', token(lexer.PREPROCESSOR, hashbang))
 
 -- Operators.
-local punct = S('+-/*%<>~!=^&|?~:;,.()[]{}@#$`\\\'')
-local dots = P('..')
-local operator = token(l.OPERATOR, dots + punct)
+lex:add_rule('operator', token(lexer.OPERATOR, '..' + S('+-/*%<>~!=^&|?~:;,.()[]{}@#$`\\\'')))
 
--- Pragmas.
-local hashbang = l.starts_line('#!') * (l.nonnewline - P('//'))^0
-local pragma = token(l.PREPROCESSOR, hashbang)
-
-M._rules = {
-  {'whitespace', ws},
-  {'comment', comment},
-  {'pragma', pragma},
-  {'keyword', keyword},
-  {'number', number},
-  {'operator', operator},
-  {'identifier', identifier},
-  {'string', string},
-}
-
-return M
+return lex