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The Go programming language
912ec1990b
Fixes #5551. Fixes #4449. Adds tests for both issues. Note that the two issues occur only when formatting partial Go code with indent. The best way to understand the change is as follows: I took the code of cmd/gofmt and go/format, combined it into one unified code that does not suffer from either 4449 nor 5551, and then applied that code to both cmd/gofmt and go/format. As a result, there is now much more identical code between the two packages, making future code deduplication easier (it was not possible to do that now without adding public APIs, which I was advised not to do at this time). More specifically, I took the parse() of cmd/gofmt which correctly preserves comments (issue 5551) and modified it to fix issue where it would sometimes modify literal values (issue 4449). I ended up removing the matchSpace() function because it no longer needed to do some of its work (insert indent), and a part of its work had to be done in advance (determining the indentation of first code line), because that calculation is required for cfg.Fprint() to run. adjustIndent is used to adjust the indent of cfg.Fprint() to compensate for the body of wrapper func being indented by one level. This allows to get rid of the bytes.Replace text manipulation of inner content, which was problematic and sometimes altered raw string literals (issue 4449). This means that sometimes the value of cfg.Indent is negative, but that works as expected. So now the algorithm for formatting partial Go code is: 1. Determine and prepend leading space of original source. 2. Determine and prepend indentation of first code line. 3. Format and write partial Go code (with all of its leading & trailing space trimmed). 4. Determine and append trailing space of original source. LGTM=gri R=golang-codereviews, bradfitz, gri CC=golang-codereviews https://golang.org/cl/142360043 |
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--
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