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go/printer, gofmt: rely on existing line breaks when formatting expression lists

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No impact on existing sources.

Fixes #1632.

R=rsc
CC=golang-dev
https://golang.org/cl/4271083
This commit is contained in:
Robert Griesemer 2011-03-28 18:48:52 -07:00
parent b2658452a6
commit 5a3aae4bf7
4 changed files with 32 additions and 14 deletions
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16
src/pkg/go/printer/nodes.go
View File

@ -160,19 +160,7 @@ func (p *printer) exprList(prev0 token.Pos, list []ast.Expr, depth int, mode exp
// the first linebreak is always a formfeed since this section must not
// depend on any previous formatting
prevBreak := -1 // index of last expression that was followed by a linebreak
linebreakMin := 1
if mode&periodSep != 0 {
// Make fragments like
//
// a.Bar(1,
// 2).Foo
//
// format correctly (a linebreak shouldn't be added before Foo) when
// doing period-separated expr lists by setting minimum linebreak to 0
// lines for them.
linebreakMin = 0
}
if prev.IsValid() && prev.Line < line && p.linebreak(line, linebreakMin, ws, true) {
if prev.IsValid() && prev.Line < line && p.linebreak(line, 0, ws, true) {
ws = ignore
*multiLine = true
prevBreak = 0
@ -237,7 +225,7 @@ func (p *printer) exprList(prev0 token.Pos, list []ast.Expr, depth int, mode exp
// lines are broken using newlines so comments remain aligned
// unless forceFF is set or there are multiple expressions on
// the same line in which case formfeed is used
if p.linebreak(line, linebreakMin, ws, useFF || prevBreak+1 < i) {
if p.linebreak(line, 0, ws, useFF || prevBreak+1 < i) {
ws = ignore
*multiLine = true
prevBreak = i

10
src/pkg/go/printer/testdata/expressions.golden vendored
View File

@ -619,3 +619,13 @@ func _() {
b.(T).
c
}
// Don't introduce extra newlines in strangely formatted expression lists.
func f() {
// os.Open parameters should remain on two lines
if writer, err = os.Open(outfile, s.O_WRONLY|os.O_CREATE|
os.O_TRUNC,0666); err != nil {
log.Fatal(err)
}
}

10
src/pkg/go/printer/testdata/expressions.input vendored
View File

@ -625,3 +625,13 @@ baz()
(T).
c
}
// Don't introduce extra newlines in strangely formatted expression lists.
func f() {
// os.Open parameters should remain on two lines
if writer, err = os.Open(outfile, s.O_WRONLY|os.O_CREATE|
os.O_TRUNC, 0666); err != nil {
log.Fatal(err)
}
}

10
src/pkg/go/printer/testdata/expressions.raw vendored
View File

@ -618,3 +618,13 @@ func _() {
b.(T).
c
}
// Don't introduce extra newlines in strangely formatted expression lists.
func f() {
// os.Open parameters should remain on two lines
if writer, err = os.Open(outfile, s.O_WRONLY|os.O_CREATE|
os.O_TRUNC,0666); err != nil {
log.Fatal(err)
}
}