128 lines
4.8 KiB
Zig
128 lines
4.8 KiB
Zig
const std = @import("std");
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const treez = @import("treez");
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pub const FileType = @This();
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color: u24,
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icon: []const u8,
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name: []const u8,
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lang_fn: LangFn,
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extensions: []const []const u8,
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highlights: [:0]const u8,
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injections: ?[:0]const u8,
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first_line_matches: ?FirstLineMatch = null,
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comment: []const u8,
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formatter: ?[]const []const u8,
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language_server: ?[]const []const u8,
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pub fn get_by_name(name: []const u8) ?*const FileType {
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for (file_types) |*file_type|
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if (std.mem.eql(u8, file_type.name, name))
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return file_type;
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return null;
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}
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pub fn guess(file_path: ?[]const u8, content: []const u8) ?*const FileType {
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if (guess_first_line(content)) |ft| return ft;
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for (file_types) |*file_type|
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if (file_path) |fp| if (match_file_type(file_type, fp))
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return file_type;
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return null;
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}
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fn guess_first_line(content: []const u8) ?*const FileType {
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const first_line = if (std.mem.indexOf(u8, content, "\n")) |pos| content[0..pos] else content;
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for (file_types) |*file_type|
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if (file_type.first_line_matches) |match|
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if (match_first_line(match, first_line))
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return file_type;
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return null;
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}
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fn match_first_line(match: FirstLineMatch, first_line: []const u8) bool {
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if (match.prefix) |prefix|
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if (prefix.len > first_line.len or !std.mem.eql(u8, first_line[0..prefix.len], prefix))
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return false;
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if (match.content) |content|
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if (std.mem.indexOf(u8, first_line, content)) |_| {} else return false;
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return true;
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}
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fn match_file_type(file_type: *const FileType, file_path: []const u8) bool {
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const basename = std.fs.path.basename(file_path);
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const extension = std.fs.path.extension(file_path);
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return for (file_type.extensions) |ext| {
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if (ext.len == basename.len and std.mem.eql(u8, ext, basename))
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return true;
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if (extension.len > 0 and ext.len == extension.len - 1 and std.mem.eql(u8, ext, extension[1..]))
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return true;
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} else false;
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}
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pub fn Parser(comptime lang: []const u8) LangFn {
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return get_parser(lang);
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}
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fn get_parser(comptime lang: []const u8) LangFn {
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const language_name = ft_func_name(lang);
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return @extern(?LangFn, .{ .name = "tree_sitter_" ++ language_name }) orelse @compileError(std.fmt.comptimePrint("Cannot find extern tree_sitter_{s}", .{language_name}));
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}
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fn ft_func_name(comptime lang: []const u8) []const u8 {
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var transform: [lang.len]u8 = undefined;
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for (lang, 0..) |c, i|
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transform[i] = if (c == '-') '_' else c;
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const func_name = transform;
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return &func_name;
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}
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const LangFn = *const fn () callconv(.C) ?*const treez.Language;
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const FirstLineMatch = struct {
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prefix: ?[]const u8 = null,
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content: ?[]const u8 = null,
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};
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pub const file_types = load_file_types(@import("file_types.zig"));
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fn vec(comptime args: anytype) []const []const u8 {
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var cmd: []const []const u8 = &[_][]const u8{};
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inline for (args) |arg| {
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cmd = cmd ++ [_][]const u8{arg};
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}
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return cmd;
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}
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fn load_file_types(comptime Namespace: type) []const FileType {
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comptime switch (@typeInfo(Namespace)) {
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.Struct => |info| {
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var count = 0;
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for (info.decls) |_| {
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// @compileLog(decl.name, @TypeOf(@field(Namespace, decl.name)));
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count += 1;
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}
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var construct_types: [count]FileType = undefined;
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var i = 0;
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for (info.decls) |decl| {
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const lang = decl.name;
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const args = @field(Namespace, lang);
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construct_types[i] = .{
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.color = if (@hasField(@TypeOf(args), "color")) args.color else 0xffffff,
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.icon = if (@hasField(@TypeOf(args), "icon")) args.icon else "",
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.name = lang,
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.lang_fn = if (@hasField(@TypeOf(args), "parser")) args.parser else get_parser(lang),
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.extensions = vec(args.extensions),
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.comment = args.comment,
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.highlights = if (@hasField(@TypeOf(args), "highlights")) @embedFile(args.highlights) else @embedFile("tree-sitter-" ++ lang ++ "/queries/highlights.scm"),
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.injections = if (@hasField(@TypeOf(args), "injections")) @embedFile(args.injections) else null,
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.first_line_matches = if (@hasField(@TypeOf(args), "first_line_matches")) args.first_line_matches else null,
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.formatter = if (@hasField(@TypeOf(args), "formatter")) vec(args.formatter) else null,
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.language_server = if (@hasField(@TypeOf(args), "language_server")) vec(args.language_server) else null,
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};
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i += 1;
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}
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const types = construct_types;
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return &types;
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},
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else => @compileError("expected tuple or struct type"),
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};
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}
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