Add a decoding algorithm for index maps #132
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takikawa
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Sep 27, 2024
takikawa
commented
Sep 27, 2024
source-map.bs
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| 1. If |offsetColumn| is not a number, [=optionally report an error=]. | ||
| 1. If |previousOffset| is not null, | ||
| 1. If |previousLastMapping| is not null, | ||
| 1. If |offsetLine| is less than |previousLastMapping|'s [=decoded mapping/generatedLine=], [=optionally report an error=]. |
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Should these range checks be "less than or equal to" to be strict inequality rather than allowing equality?
takikawa
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Sep 27, 2024
jkrems
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Sep 27, 2024
jridgewell
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Oct 2, 2024
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takikawa
changed the title
These aren't linked to so they don't need the tags
jridgewell
reviewed
Nov 11, 2024
* Fix first line issue * Use extend again for new mappings
* Check the overlap of ranges {lastFirst, lastPrev} and the
{first, last} of the current source map section instead of
current more complicated steps.
* The overlap check also ensures the order of the ranges, beyond
the ordering of the offsets (which itself doesn't guarantee
range order)
* Some editorial changes for the check
Also set a default value so the algorithm continues
jridgewell
approved these changes
Nov 20, 2024
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Rendered draft
This PR adds a decoding algorithm for index maps along the lines of the existing algorithms for normal source maps.
I'll leave a few comments for cases in the spec where it's not clear what we should do: