site.rs (3028B)
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/// Location from within source.
#[derive(Clone, Copy)]
pub struct Location {
/// Specific line (first line).
pub line : Option<usize>,
/// First column on first line.
pub column : Option<usize>,
/// Last column on the last line.
pub last_column: Option<usize>,
/// Number of lines it spans.
pub lines : Option<usize>,
/// Number of columns it spans (according to unicode character width).
pub columns : Option<usize>,
/// Number of bytes the selection spans (includes line-feeds).
pub span : Option<usize>,
/// Amount of bytes from the beginning of the file to the first column.
pub byte_offset : Option<usize>,
}
/// Only to be used for fake nodes.
pub const NULL_LOCATION : Location = Location {
line: None,
column: None,
last_column: None,
lines: None,
columns: None,
span: None,
byte_offset: None,
};
/// Describes exactly where the source comes from.
#[derive(Clone)]
pub struct Site {
/// Source may or may not come from a file.
pub path : Option<PathBuf>,
/// Source is from a REPL instance.
pub repl : bool,
/// The specific piece of source / AST node may come from
/// a specific column and line from within the file.
pub location : Location,
/// Is the node in a real location?
pub fake : bool,
}
pub const FAKE_SITE : Site = Site {
path: None,
repl: false,
location: NULL_LOCATION,
fake: true,
};
impl Location {
/// Last line in selection.
#[inline]
pub fn last_line(&self) -> Option<usize> {
match self.line {
Some(line) => if let Some(lines) = self.lines {
Some(line + lines - 1)
} else { None }
None => None
}
}
/// Number of characters from the last column to the beginning of file,
/// (offset in bytes from the top of file to last column).
#[inline]
pub fn eos(&self) -> Option<usize> {
match self.byte_offset {
Some(bof) => if let Some(span) = self.span {
Some(bof + span)
} else { None }
None => None
}
}
}
impl std::default::Default for Location {
fn default() -> Self { NULL_LOCATION }
}
impl Site {
pub fn new() -> Self {
Self::default()
}
pub fn single_line(line : usize, col : usize,
cols : usize, bytes : usize, ptr : usize) -> Self {
let mut s = Self::default();
s.location.line = Some(line);
s.location.column = Some(col);
s.location.columns = Some(cols);
s.location.span = Some(bytes);
s.location.lines = Some(1);
s.location.last_column = Some(col + cols);
s.location.byte_offset = Some(ptr);
s
}
pub fn with_filename(&self, name : &str) -> Self {
let mut s = self.clone();
s.path = Some(PathBuf::from(name));
s
}
}
impl std::default::Default for Site {
fn default() -> Self { FAKE_SITE }
}
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