0c884d0810
This change enables printing of relative column information if a prior line directive specified a valid column. If there was no line directive, or the line directive didn't specify a column (or the -C flag is specified), no column information is shown in file positions. Implementation: Column values (and line values, for that matter) that are zero are interpreted as "unknown". A line directive that doesn't specify a column records that as a zero column in the respective PosBase data structure. When computing relative columns, a relative value is zero of the base's column value is zero. When formatting a position, a zero column value is not printed. To make this work without special cases, the PosBase for a file is given a concrete (non-0:0) position 1:1 with the PosBase's line and column also being 1:1. In other words, at the position 1:1 of a file, it's relative positions are starting with 1:1 as one would expect. In the package syntax, this requires self-recursive PosBases for file bases, matching what cmd/internal/src.PosBase was already doing. In src.PosBase, file and inlining bases also need to be based at 1:1 to indicate "known" positions. This change completes the cmd/compiler part of the issue below. Fixes #22662. Change-Id: I6c3d2dee26709581fba0d0261b1d12e93f1cba1a Reviewed-on: https://go-review.googlesource.com/97375 Reviewed-by: Matthew Dempsky <mdempsky@google.com> |
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README.md
The Go Programming Language
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