Documentation

Lean.Data.Position

structure Lean.Position :
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    • { line := a, column := a_1 }.lt { line := b, column := b_1 } = decide ((a, a_1).lexLt (b, b_1))
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      structure Lean.FileMap :

      Content of a file together with precalculated positions of newlines.

      • source : String

        The content of the file.

      • positions : Array String.Pos

        The positions of newline characters. The first entry is always 0 and the last always the index of the last character. In particular, if the last character is a newline, that index will appear twice.

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        class Lean.MonadFileMap (m : TypeType) :
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          The last line should always be positions.size - 1.

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          • fmap.getLastLine = fmap.positions.size - 1
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            The line numbers associated with the positions of the FileMap. fmap.getLine i is the iᵗʰ entry of #[1, 2, …, n-1, n-1] where n is the size of positions.

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            • fmap.getLine x = min (x + 1) fmap.getLastLine
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                partial def Lean.FileMap.toPosition.loop (fmap : Lean.FileMap) (pos : String.Pos) (str : String) (ps : Array String.Pos) (b : Nat) (e : Nat) :

                Convert a Lean.Position to a String.Pos.

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                  Returns the position of the start of (1-based) line line. This gives the same result as map.ofPosition ⟨line, 0⟩, but is more efficient.

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                  • map.lineStart line = if h : line - 1 < map.positions.size then map.positions.get line - 1, h else map.positions.back?.getD 0
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