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Partial work-around for gofmt bug.

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Addresses some cases and respects position of
closing parenthesis; but doesn't work yet in
all cases. Heuristic; will need to be replaced
by a real solution eventually. Does not cause
existing code to be reformatted.

R=r
CC=golang-dev, rsc
https://golang.org/cl/186043
This commit is contained in:
Robert Griesemer 2010-01-11 10:38:06 -08:00
parent 5336cd8f91
commit 93d81fb747
5 changed files with 109 additions and 26 deletions
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48
src/pkg/go/printer/nodes.go
View File

@ -114,7 +114,7 @@ func (p *printer) identList(list []*ast.Ident, multiLine *bool) {
for i, x := range list {
xlist[i] = x
}
p.exprList(noPos, xlist, 1, commaSep, multiLine)
p.exprList(noPos, xlist, 1, commaSep, multiLine, noPos)
}
@ -125,7 +125,7 @@ func (p *printer) stringList(list []*ast.BasicLit, multiLine *bool) {
for i, x := range list {
xlist[i] = x
}
p.exprList(noPos, xlist, 1, plusSep, multiLine)
p.exprList(noPos, xlist, 1, plusSep, multiLine, noPos)
}
@ -136,7 +136,7 @@ const (
blankEnd // print a blank after a non-empty list
plusSep // elements are separared by + operators
commaSep // elements are separated by commas
commaTerm // elements are terminated by comma
commaTerm // list is optionally terminated by a comma
noIndent // no extra indentation in multi-line lists
)
@ -166,7 +166,7 @@ func (p *printer) beforeComment(pos token.Position) token.Position {
// source lines, the original line breaks are respected between
// expressions. Sets multiLine to true if the list spans multiple
// lines.
func (p *printer) exprList(prev token.Position, list []ast.Expr, depth int, mode exprListMode, multiLine *bool) {
func (p *printer) exprList(prev token.Position, list []ast.Expr, depth int, mode exprListMode, multiLine *bool, next token.Position) {
if len(list) == 0 {
return
}
@ -175,11 +175,14 @@ func (p *printer) exprList(prev token.Position, list []ast.Expr, depth int, mode
p.print(blank)
}
// TODO(gri): endLine may be incorrect as it is really the beginning
// of the last list entry. There may be only one, very long
// entry in which case line == endLine.
line := list[0].Pos().Line
endLine := list[len(list)-1].Pos().Line
endLine := next.Line
if endLine == 0 {
// TODO(gri): endLine may be incorrect as it is really the beginning
// of the last list entry. There may be only one, very long
// entry in which case line == endLine.
endLine = list[len(list)-1].Pos().Line
}
if prev.IsValid() && prev.Line == line && line == endLine {
// all list entries on a single line
@ -238,7 +241,8 @@ func (p *printer) exprList(prev token.Position, list []ast.Expr, depth int, mode
p.expr0(x, depth, multiLine)
}
if mode&commaTerm != 0 {
if mode&commaTerm != 0 && next.IsValid() && p.pos.Line < next.Line {
// print a terminating comma if the next token is on a new line
p.print(token.COMMA)
if ws == ignore && mode&noIndent == 0 {
// unindent if we indented
@ -304,8 +308,6 @@ func identListSize(list []*ast.Ident, maxSize int) (size int) {
for i, x := range list {
if i > 0 {
size += 2 // ", "
}
size += len(x.Value)
if size >= maxSize {
@ -329,8 +331,6 @@ func (p *printer) isOneLineFieldList(list []*ast.Field) bool {
namesSize := identListSize(f.Names, maxSize)
if namesSize > 0 {
namesSize = 1 // blank between names and types
}
typeSize := p.nodeSize(f.Type, maxSize)
return namesSize+typeSize <= maxSize
@ -743,7 +743,11 @@ func (p *printer) expr1(expr ast.Expr, prec1, depth int, ctxt exprContext, multi
}
p.expr1(x.Fun, token.HighestPrec, depth, 0, multiLine)
p.print(x.Lparen, token.LPAREN)
p.exprList(x.Lparen, x.Args, depth, commaSep, multiLine)
mode := commaSep
if p.Mode&NoSemis != 0 {
mode |= commaTerm
}
p.exprList(x.Lparen, x.Args, depth, mode, multiLine, x.Rparen)
p.print(x.Rparen, token.RPAREN)
case *ast.CompositeLit:
@ -762,7 +766,7 @@ func (p *printer) expr1(expr ast.Expr, prec1, depth int, ctxt exprContext, multi
}
}
p.print(x.Lbrace, token.LBRACE)
p.exprList(x.Lbrace, x.Elts, 1, mode, multiLine)
p.exprList(x.Lbrace, x.Elts, 1, mode, multiLine, x.Rbrace)
p.print(x.Rbrace, token.RBRACE)
case *ast.Ellipsis:
@ -969,9 +973,9 @@ func (p *printer) stmt(stmt ast.Stmt, multiLine *bool) (optSemi bool) {
if len(s.Lhs) > 1 && len(s.Rhs) > 1 {
depth++
}
p.exprList(s.Pos(), s.Lhs, depth, commaSep, multiLine)
p.exprList(s.Pos(), s.Lhs, depth, commaSep, multiLine, s.TokPos)
p.print(blank, s.TokPos, s.Tok)
p.exprList(s.TokPos, s.Rhs, depth, blankStart|commaSep, multiLine)
p.exprList(s.TokPos, s.Rhs, depth, blankStart|commaSep, multiLine, noPos)
case *ast.GoStmt:
p.print(token.GO, blank)
@ -984,7 +988,7 @@ func (p *printer) stmt(stmt ast.Stmt, multiLine *bool) (optSemi bool) {
case *ast.ReturnStmt:
p.print(token.RETURN)
if s.Results != nil {
p.exprList(s.Pos(), s.Results, 1, blankStart|commaSep, multiLine)
p.exprList(s.Pos(), s.Results, 1, blankStart|commaSep, multiLine, noPos)
}
case *ast.BranchStmt:
@ -1020,7 +1024,7 @@ func (p *printer) stmt(stmt ast.Stmt, multiLine *bool) (optSemi bool) {
case *ast.CaseClause:
if s.Values != nil {
p.print(token.CASE)
p.exprList(s.Pos(), s.Values, 1, blankStart|commaSep, multiLine)
p.exprList(s.Pos(), s.Values, 1, blankStart|commaSep, multiLine, s.Colon)
} else {
p.print(token.DEFAULT)
}
@ -1038,7 +1042,7 @@ func (p *printer) stmt(stmt ast.Stmt, multiLine *bool) (optSemi bool) {
case *ast.TypeCaseClause:
if s.Types != nil {
p.print(token.CASE)
p.exprList(s.Pos(), s.Types, 1, blankStart|commaSep, multiLine)
p.exprList(s.Pos(), s.Types, 1, blankStart|commaSep, multiLine, s.Colon)
} else {
p.print(token.DEFAULT)
}
@ -1159,7 +1163,7 @@ func (p *printer) spec(spec ast.Spec, n int, context declContext, multiLine *boo
}
if s.Values != nil {
p.print(blank, token.ASSIGN)
p.exprList(noPos, s.Values, 1, blankStart|commaSep, multiLine)
p.exprList(noPos, s.Values, 1, blankStart|commaSep, multiLine, noPos)
optSemi = false
}
} else {
@ -1174,7 +1178,7 @@ func (p *printer) spec(spec ast.Spec, n int, context declContext, multiLine *boo
if s.Values != nil {
p.print(vtab)
p.print(token.ASSIGN)
p.exprList(noPos, s.Values, 1, blankStart|commaSep, multiLine)
p.exprList(noPos, s.Values, 1, blankStart|commaSep, multiLine, noPos)
optSemi = false
extraTabs = 0
}

2
src/pkg/go/printer/printer.go
View File

@ -745,7 +745,7 @@ func (p *printer) print(args ...) {
// escape all literals so they pass through unchanged
// (note that valid Go programs cannot contain esc ('\xff')
// bytes since they do not appear in legal UTF-8 sequences)
// TODO(gri): this this more efficiently.
// TODO(gri): do this more efficiently.
data = strings.Bytes("\xff" + string(data) + "\xff")
case token.Token:
if p.Styler != nil {

28
src/pkg/go/printer/testdata/expressions.golden vendored
View File

@ -221,7 +221,7 @@ func _() {
func _() {
// not not add extra indentation to multi-line string lists
// do not add extra indentation to multi-line string lists
_ = "foo" + "bar";
_ = "foo" +
"bar" +
@ -309,6 +309,32 @@ func _() {
}
// Correct placement of terminating comma/closing parentheses in multi-line calls.
func _() {
f(1,
2,
3);
f(1,
2,
3);
// TODO(gri) the cases below are not correct yet
f(1,
2,
3); // comment
f(1,
2,
3 // comment
);
f(1,
2,
3); // comment
f(1,
2,
3 // comment
);
}
func same(t, u *Time) bool {
// respect source lines in multi-line expressions
return t.Year == u.Year &&

29
src/pkg/go/printer/testdata/expressions.input vendored
View File

@ -225,7 +225,7 @@ func _() {
func _() {
// not not add extra indentation to multi-line string lists
// do not add extra indentation to multi-line string lists
_ = "foo" + "bar";
_ = "foo" +
"bar" +
@ -314,6 +314,33 @@ func _() {
}
// Correct placement of terminating comma/closing parentheses in multi-line calls.
func _() {
f(1,
2,
3);
f(1,
2,
3
);
// TODO(gri) the cases below are not correct yet
f(1,
2,
3); // comment
f(1,
2,
3 // comment
);
f(1,
2,
3);// comment
f(1,
2,
3// comment
);
}
func same(t, u *Time) bool {
// respect source lines in multi-line expressions
return t.Year == u.Year &&

28
src/pkg/go/printer/testdata/expressions.raw vendored
View File

@ -221,7 +221,7 @@ func _() {
func _() {
// not not add extra indentation to multi-line string lists
// do not add extra indentation to multi-line string lists
_ = "foo" + "bar";
_ = "foo" +
"bar" +
@ -309,6 +309,32 @@ func _() {
}
// Correct placement of terminating comma/closing parentheses in multi-line calls.
func _() {
f(1,
2,
3);
f(1,
2,
3);
// TODO(gri) the cases below are not correct yet
f(1,
2,
3); // comment
f(1,
2,
3 // comment
);
f(1,
2,
3); // comment
f(1,
2,
3 // comment
);
}
func same(t, u *Time) bool {
// respect source lines in multi-line expressions
return t.Year == u.Year &&