Struct syntex_pos::Span [] [src]

pub struct Span {
    pub lo: BytePos,
    pub hi: BytePos,
    pub expn_id: ExpnId,
}

Spans represent a region of code, used for error reporting. Positions in spans are absolute positions from the beginning of the codemap, not positions relative to FileMaps. Methods on the CodeMap can be used to relate spans back to the original source. You must be careful if the span crosses more than one file - you will not be able to use many of the functions on spans in codemap and you cannot assume that the length of the span = hi - lo; there may be space in the BytePos range between files.

Fields

Information about where the macro came from, if this piece of code was created by a macro expansion.

Methods

impl Span
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Returns a new span representing just the end-point of this span

Returns self if self is not the dummy span, and other otherwise.

Return true if the spans are equal with regards to the source text.

Use this instead of == when either span could be generated code, and you only care that they point to the same bytes of source text.

Returns Some(span), a union of self and other, on overlap.

Returns Some(span), where the start is trimmed by the end of other

Trait Implementations

impl Eq for Span
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impl PartialEq for Span
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This method tests for self and other values to be equal, and is used by ==. Read more

This method tests for !=.

impl Hash for Span
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Feeds this value into the state given, updating the hasher as necessary.

Feeds a slice of this type into the state provided.

impl Copy for Span
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impl Clone for Span
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Returns a copy of the value. Read more

Performs copy-assignment from source. Read more

impl Encodable for Span
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impl Decodable for Span
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impl Debug for Span
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Formats the value using the given formatter.