fd3d42ae33
git-subtree-dir: golang-lean git-subtree-mainline:6487c7046fgit-subtree-split:f5f1701922
18 lines
583 B
Text
18 lines
583 B
Text
import GolangLean.Token
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import GolangLean.Error
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namespace GolangLean
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/-! # Scanner — port of `go/scanner/scanner.go`.
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Stub. The real implementation is a hand-written DFA over UTF-8 byte input,
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faithful to the upstream Go scanner. We start with a `notImpl` sentinel so
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the project compiles, then fill in token-by-token alongside the parser. -/
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partial def scan (src : String) : Except GoError (Array Token) := do
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if src.isEmpty then
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return #[⟨.eof, ⟨1, 1, 0⟩⟩]
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else
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.error (.notImpl "Scanner.scan: see go-upstream/src/go/scanner/scanner.go")
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end GolangLean
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