55 lines
1.8 KiB
Zig
55 lines
1.8 KiB
Zig
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const std = @import("std");
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const types = @import("types.zig");
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pub const Encoding = enum {
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utf8,
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utf16,
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};
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pub const DocumentPosition = struct {
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line: []const u8,
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line_index: usize,
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absolute_index: usize,
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};
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pub fn documentPosition(doc: types.TextDocument, position: types.Position, encoding: Encoding) !DocumentPosition {
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var split_iterator = std.mem.split(doc.text, "\n");
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var line_idx: i64 = 0;
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var line: []const u8 = "";
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while (line_idx < position.line) : (line_idx += 1) {
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line = split_iterator.next() orelse return error.InvalidParams;
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}
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const line_start_idx = split_iterator.index.?;
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line = split_iterator.next() orelse return error.InvalidParams;
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if (encoding == .utf8) {
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const index = @intCast(i64, line_start_idx) + position.character;
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if (index < 0 or index > @intCast(i64, doc.text.len)) {
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return error.InvalidParams;
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}
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return DocumentPosition{ .line = line, .absolute_index = @intCast(usize, index), .line_index = @intCast(usize, position.character) };
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} else {
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const utf8 = doc.text[line_start_idx..];
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var utf8_idx: usize = 0;
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var utf16_idx: usize = 0;
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while (utf16_idx < position.character) {
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if (utf8_idx > utf8.len) {
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return error.InvalidParams;
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}
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const n = try std.unicode.utf8ByteSequenceLength(utf8[utf8_idx]);
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const next_utf8_idx = utf8_idx + n;
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const codepoint = try std.unicode.utf8Decode(utf8[utf8_idx..next_utf8_idx]);
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if (codepoint < 0x10000) {
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utf16_idx += 1;
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} else {
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utf16_idx += 2;
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}
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utf8_idx = next_utf8_idx;
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}
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return DocumentPosition{ .line = line, .absolute_index = line_start_idx + utf8_idx, .line_index = utf8_idx };
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}
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}
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