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-- mod-version:3
-- to better understand these comments, see this section from rxi's article
-- https://rxi.github.io/lite_an_implementation_overview.html#syntax_highlighting
-- first, we need to require the syntax module
local syntax = require "core.syntax"
--[[
then, we'll add a new syntax to the syntax module, lite-xl matches Lua patterns
against the source code in order to highlight the code.
]]
syntax.add {
-- the extension of source code
files = "%.nelua$",
-- this add support for shebang, is not rare to add #!/usr/local/bin/lua to make
-- lua scripts executable, here we add support for it for nelua
headers = "^#!.*[ /]nelua",
-- tells to lite how to toggle comments
comment = "--",
-- finally the patterns, is a table of tables,
-- each entry is a table with some fields, especially with "pattern" and "type" fields.
patterns = {
--[[
["pattern"] field:
Describes a syntax pattern, this is done with Lua Patterns
you can learn it works here: https://www.lua.org/manual/5.4/manual.html#6.4.1
The pattern can be a string or a table, when is a string, then is just a
pattern that match everything, when is a table, then it follows this
logic:
{ range_start_pattern, range_end_pattern [, escape_character] }
The matched range_start_pattern and range_end_pattern text will be highlighted, but the
text between them will not.
["syntax"] field:
Optional field, when set, the text between matched ranges will use syntax from another language,
a good common known example of this is using javascript syntax inside a `script` element:
https://github.com/lite-xl/lite-xl/blob/df667ad28e9995f8cb79dab64e6039f095c202f4/data/plugins/language_html.lua#L17-L23
["type"] field:
Set the style that should be used, this is defined on the "style" file from
the lite-xl's source, at "data/core/style.lua".
]]
{
pattern = {"##%[=*%[", "%]=*%]"},
syntax = ".lua",
type = "function",
},
{
pattern = {"#|", "|#"},
syntax = ".lua",
type = "function",
},
{
pattern = {"##", "\n"},
syntax = ".lua",
type = "function",
},
{ pattern = { '"', '"', '\\' }, type = "string" },
{ pattern = { "'", "'", '\\' }, type = "string" },
{ pattern = { "%[%[", "%]%]" }, type = "string" },
{ pattern = { "%-%-%[=*%[", "%]=*%]"}, type = "comment" },
{ pattern = "%-%-.-\n", type = "comment" },
{ pattern = "0x%x+%.%x*[pP][-+]?%d+", type = "number" },
{ pattern = "0x%x+%.%x*", type = "number" },
{ pattern = "0x%.%x+[pP][-+]?%d+", type = "number" },
{ pattern = "0x%.%x+", type = "number" },
{ pattern = "0x%x+[pP][-+]?%d+", type = "number" },
{ pattern = "0x%x+", type = "number" },
{ pattern = "%d%.%d*[eE][-+]?%d+", type = "number" },
{ pattern = "%d%.%d*", type = "number" },
{ pattern = "%.?%d*[eE][-+]?%d+", type = "number" },
{ pattern = "<%S[%w+%._,%s*'\"()<>]-%S>", type = "keyword2" },
{ pattern = "%.?%d+", type = "number" },
{ pattern = "%.%.%.?", type = "operator" },
{ pattern = "[<>~=]=", type = "operator" },
{ pattern = "[%+%-=/%*%^%%#<>]", type = "operator" },
{ pattern = "[%a_][%w_]*()%s*%f[(\"'{]", type = {"function", "normal"} },
{ pattern = "[%a_][%w_]*", type = "symbol" },
{ pattern = "::[%a_][%w_]*::", type = "function" },
},
-- special symbols, like keywords
symbols = {
-- lua symbols
["if"] = "keyword",
["then"] = "keyword",
["else"] = "keyword",
["elseif"] = "keyword",
["end"] = "keyword",
["do"] = "keyword",
["function"] = "keyword",
["repeat"] = "keyword",
["until"] = "keyword",
["while"] = "keyword",
["for"] = "keyword",
["break"] = "keyword",
["return"] = "keyword",
["local"] = "keyword",
["in"] = "keyword",
["not"] = "keyword",
["and"] = "keyword",
["or"] = "keyword",
["goto"] = "keyword",
["self"] = "keyword2",
["true"] = "literal",
["false"] = "literal",
["nil"] = "literal",
-- nelua symbols
["global"] = "keyword",
["switch"] = "keyword",
["case"] = "keyword",
["defer"] = "keyword",
["continue"] = "keyword",
["nilptr"] = "keyword",
},
}
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