To enable diagnostics, declare var diagnostics = Diagnostics{}; then call source.enableDiagnostics(&diagnostics);
where source is either a std.json.Reader or a std.json.Scanner that has just been initialized.
At any time, notably just after an error, call getLine(), getColumn(), and/or getByteOffset()
to get meaningful information from this.
line_number: u64 = 1line_start_cursor: usize = @as(usize, @bitCast(@as(isize, -1)))total_bytes_before_current_input: u64 = 0cursor_pointer: *const usize = undefinedpub fn getLine(self: *const @This()) u64Starts at 1.
self: *const @This()pub fn getLine(self: *const @This()) u64 {
return self.line_number;
}pub fn getColumn(self: *const @This()) u64Starts at 1.
self: *const @This()pub fn getColumn(self: *const @This()) u64 {
return self.cursor_pointer.* -% self.line_start_cursor;
}pub fn getByteOffset(self: *const @This()) u64Starts at 0. Measures the byte offset since the start of the input.
self: *const @This()pub fn getByteOffset(self: *const @This()) u64 {
return self.total_bytes_before_current_input + self.cursor_pointer.*;
}pub const Diagnostics = struct {
line_number: u64 = 1,
line_start_cursor: usize = @as(usize, @bitCast(@as(isize, -1))), // Start just "before" the input buffer to get a 1-based column for line 1.
total_bytes_before_current_input: u64 = 0,
cursor_pointer: *const usize = undefined,
/// Starts at 1.
pub fn getLine(self: *const @This()) u64 {
return self.line_number;
}
/// Starts at 1.
pub fn getColumn(self: *const @This()) u64 {
return self.cursor_pointer.* -% self.line_start_cursor;
}
/// Starts at 0. Measures the byte offset since the start of the input.
pub fn getByteOffset(self: *const @This()) u64 {
return self.total_bytes_before_current_input + self.cursor_pointer.*;
}
}