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f8cf82f6f2
If a printer is configured with the SourcePos mode set, it will emit //-line comments as necessary to ensure that the result - if reparsed - reflects the original source position information. This change required a bit of reworking of the output section in printer.go. Specifically: - Introduced new Config mode 'SourcePos'. - Introduced new position 'out' which tracks the position of the generated output if it were read in again. If there is a discrepancy between out and the current AST/source position, a //line comment is emitted to correct for it. - Lazy emission of indentation so that //line comments can be placed correctly. As a result, the trimmer will have to do less work. - Merged writeItem into writeString. - Merged writeByteN into writeByte. - Use a []byte instead of a byte.Buffer both in the printer and in the trimmer (eliminates dependency). Also: introduced explicit printer.Mode type (in sync w/ parser.Mode, scanner.Mode, etc.) Runs all tests. Applied gofmt to src, misc w/o changes. Fixes #1047. Fixes #2697. R=rsc, rsc CC=golang-dev https://golang.org/cl/5643066 |
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