mirror of
https://github.com/golang/go
synced 2024-11-11 22:50:22 -07:00
godoc: don't convert multi-line functions into one-liners by default
- new heuristic: if both the opening { and closing } braces are on the same line, and the function body doesn't contain comments or is other- wise too long (e.g. signature too long), it is formatted as a one-line function - related cleanups along the way - gofmt -w src misc led to no additional changes as expected R=rsc, rsc1 CC=golang-dev, ken2, r https://golang.org/cl/758041
This commit is contained in:
parent
c93273c0f5
commit
6358e1faf6
@ -74,7 +74,7 @@ func (p *printer) setComment(g *ast.CommentGroup) {
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// for some reason there are pending comments; this
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// should never happen - handle gracefully and flush
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// all comments up to g, ignore anything after that
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p.flush(g.List[0].Pos(), false)
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p.flush(g.List[0].Pos(), token.ILLEGAL)
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}
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p.comments[0] = g
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p.cindex = 0
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@ -112,7 +112,6 @@ func (p *printer) identList(list []*ast.Ident, indent bool, multiLine *bool) {
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// Compute the key size of a key:value expression.
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// Returns 0 if the expression doesn't fit onto a single line.
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func (p *printer) keySize(pair *ast.KeyValueExpr) int {
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const infinity = 1e6 // larger than any source line
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if p.nodeSize(pair, infinity) <= infinity {
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// entire expression fits on one line - return key size
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return p.nodeSize(pair.Key, infinity)
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@ -431,7 +430,7 @@ func (p *printer) fieldList(fields *ast.FieldList, isIncomplete bool, ctxt exprC
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if len(list) > 0 {
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p.print(formfeed)
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}
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p.flush(rbrace, false) // make sure we don't loose the last line comment
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p.flush(rbrace, token.RBRACE) // make sure we don't loose the last line comment
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p.setLineComment("// contains unexported fields")
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}
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@ -458,7 +457,7 @@ func (p *printer) fieldList(fields *ast.FieldList, isIncomplete bool, ctxt exprC
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if len(list) > 0 {
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p.print(formfeed)
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}
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p.flush(rbrace, false) // make sure we don't loose the last line comment
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p.flush(rbrace, token.RBRACE) // make sure we don't loose the last line comment
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p.setLineComment("// contains unexported methods")
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}
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@ -1224,16 +1223,26 @@ func (p *printer) nodeSize(n ast.Node, maxSize int) (size int) {
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func (p *printer) isOneLineFunc(b *ast.BlockStmt, headerSize int) bool {
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const maxSize = 90 // adjust as appropriate, this is an approximate value
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bodySize := 0
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switch {
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case len(b.List) > 1 || p.commentBefore(b.Rbrace):
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return false // too many statements or there is a comment - all bets are off
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case len(b.List) == 1:
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bodySize = p.nodeSize(b.List[0], maxSize)
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pos1 := b.Pos()
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pos2 := b.Rbrace
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if pos1.IsValid() && pos2.IsValid() && pos1.Line != pos2.Line {
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// opening and closing brace are on different lines - don't make it a one-liner
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return false
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}
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// require both headers and overall size to be not "too large"
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return headerSize <= maxSize/2 && headerSize+bodySize <= maxSize
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if len(b.List) > 5 || p.commentBefore(pos2) {
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// too many statements or there is a comment inside - don't make it a one-liner
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return false
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}
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// otherwise, estimate body size
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const maxSize = 100
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bodySize := 0
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for i, s := range b.List {
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if i > 0 {
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bodySize += 2 // space for a semicolon and blank
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}
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bodySize += p.nodeSize(s, maxSize)
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}
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return headerSize+bodySize <= maxSize
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}
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@ -1248,13 +1257,18 @@ func (p *printer) funcBody(b *ast.BlockStmt, headerSize int, isLit bool, multiLi
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if isLit {
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sep = blank
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}
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p.print(sep, b.Pos(), token.LBRACE)
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if len(b.List) > 0 {
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p.print(sep, b.Pos(), token.LBRACE, blank)
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p.stmt(b.List[0], ignoreMultiLine)
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p.print(blank, b.Rbrace, token.RBRACE)
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} else {
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p.print(sep, b.Pos(), token.LBRACE, b.Rbrace, token.RBRACE)
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p.print(blank)
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for i, s := range b.List {
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if i > 0 {
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p.print(token.SEMICOLON, blank)
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}
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p.stmt(s, ignoreMultiLine)
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}
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p.print(blank)
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}
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p.print(b.Rbrace, token.RBRACE)
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return
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}
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@ -1266,12 +1280,12 @@ func (p *printer) funcBody(b *ast.BlockStmt, headerSize int, isLit bool, multiLi
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// distance returns the column difference between from and to if both
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// are on the same line; if they are on different lines (or unknown)
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// the result is infinity (1<<30).
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// the result is infinity.
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func distance(from, to token.Position) int {
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if from.IsValid() && to.IsValid() && from.Line == to.Line {
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return to.Column - from.Column
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}
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return 1 << 30
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return infinity
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}
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@ -53,8 +53,8 @@ var (
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// Special positions
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var noPos token.Position // use noPos when a position is needed but not known
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var infinity = token.Position{Offset: 1 << 30, Line: 1 << 30} // use infinity to indicate the end of the source
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var noPos token.Position // use noPos when a position is needed but not known
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var infinity = 1 << 30
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// Use ignoreMultiLine if the multiLine information is not important.
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@ -640,17 +640,16 @@ func (p *printer) writeCommentSuffix(needsLinebreak bool) (droppedFF bool) {
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// intersperseComments consumes all comments that appear before the next token
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// and prints it together with the buffered whitespace (i.e., the whitespace
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// tok and prints it together with the buffered whitespace (i.e., the whitespace
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// that needs to be written before the next token). A heuristic is used to mix
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// the comments and whitespace. The isKeyword parameter indicates if the next
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// token is a keyword or not. intersperseComments returns true if a pending
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// the comments and whitespace. intersperseComments returns true if a pending
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// formfeed was dropped from the whitespace buffer.
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//
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func (p *printer) intersperseComments(next token.Position, isKeyword bool) (droppedFF bool) {
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func (p *printer) intersperseComments(next token.Position, tok token.Token) (droppedFF bool) {
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var last *ast.Comment
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for ; p.commentBefore(next); p.cindex++ {
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for _, c := range p.comments[p.cindex].List {
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p.writeCommentPrefix(c.Pos(), next, last == nil, isKeyword)
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p.writeCommentPrefix(c.Pos(), next, last == nil, tok.IsKeyword())
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p.writeComment(c)
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last = c
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}
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@ -663,8 +662,8 @@ func (p *printer) intersperseComments(next token.Position, isKeyword bool) (drop
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p.write([]byte{' '})
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}
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// ensure that there is a newline after a //-style comment
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// or if we are at the end of a file after a /*-style comment
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return p.writeCommentSuffix(last.Text[1] == '/' || next.Offset == infinity.Offset)
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// or if we are before a closing '}' or at the end of a file
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return p.writeCommentSuffix(last.Text[1] == '/' || tok == token.RBRACE || tok == token.EOF)
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}
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// no comment was written - we should never reach here since
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@ -743,7 +742,7 @@ func (p *printer) print(args ...interface{}) {
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next := p.pos // estimated position of next item
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var data []byte
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var tag HTMLTag
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isKeyword := false
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var tok token.Token
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switch x := f.(type) {
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case whiteSpace:
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if x == ignore {
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@ -785,7 +784,7 @@ func (p *printer) print(args ...interface{}) {
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} else {
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data = []byte(x.String())
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}
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isKeyword = x.IsKeyword()
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tok = x
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case token.Position:
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if x.IsValid() {
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next = x // accurate position of next item
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@ -797,7 +796,7 @@ func (p *printer) print(args ...interface{}) {
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p.pos = next
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if data != nil {
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droppedFF := p.flush(next, isKeyword)
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droppedFF := p.flush(next, tok)
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// intersperse extra newlines if present in the source
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// (don't do this in flush as it will cause extra newlines
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@ -820,14 +819,15 @@ func (p *printer) commentBefore(next token.Position) bool {
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// Flush prints any pending comments and whitespace occuring
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// textually before the position of the next item. Flush returns
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// true if a pending formfeed character was dropped from the
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// whitespace buffer as a result of interspersing comments.
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// textually before the position of the next token tok. Flush
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// returns true if a pending formfeed character was dropped
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// from the whitespace buffer as a result of interspersing
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// comments.
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//
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func (p *printer) flush(next token.Position, isKeyword bool) (droppedFF bool) {
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func (p *printer) flush(next token.Position, tok token.Token) (droppedFF bool) {
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if p.commentBefore(next) {
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// if there are comments before the next item, intersperse them
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droppedFF = p.intersperseComments(next, isKeyword)
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droppedFF = p.intersperseComments(next, tok)
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} else {
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// otherwise, write any leftover whitespace
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p.writeWhitespace(len(p.buffer))
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@ -1026,7 +1026,7 @@ func (cfg *Config) Fprint(output io.Writer, node interface{}) (int, os.Error) {
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p.errors <- os.NewError(fmt.Sprintf("printer.Fprint: unsupported node type %T", n))
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runtime.Goexit()
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}
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p.flush(infinity, false)
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p.flush(token.Position{Offset: infinity, Line: infinity}, token.EOF)
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p.errors <- nil // no errors
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}()
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err := <-p.errors // wait for completion of goroutine
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11
src/pkg/go/printer/testdata/comments.golden
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11
src/pkg/go/printer/testdata/comments.golden
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@ -411,7 +411,8 @@ func _() {
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// Some interesting interspersed comments
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func _( /* this */ x /* is */ /* an */ int) {}
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func _( /* this */ x /* is */ /* an */ int) {
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}
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func _( /* no params */ ) {}
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@ -421,7 +422,13 @@ func _() {
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func ( /* comment1 */ T /* comment2 */ ) _() {}
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func _() { /* one-liner */ }
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func _() { /* one-liner */
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}
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func _() {
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_ = 0
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/* closing curly brace should be on new line */
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}
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// Line comments with tabs
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4
src/pkg/go/printer/testdata/comments.input
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4
src/pkg/go/printer/testdata/comments.input
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@ -424,6 +424,10 @@ func (/* comment1 */ T /* comment2 */) _() {}
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func _() { /* one-liner */ }
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func _() {
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_ = 0
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/* closing curly brace should be on new line */ }
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// Line comments with tabs
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func _() {
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27
src/pkg/go/printer/testdata/declarations.golden
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27
src/pkg/go/printer/testdata/declarations.golden
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@ -356,7 +356,8 @@ func _() {
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// formatting of structs
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type _ struct{}
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type _ struct { /* this comment should be visible */ }
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type _ struct { /* this comment should be visible */
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}
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type _ struct {
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// this comment should be visible and properly indented
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@ -588,15 +589,31 @@ func _() {}
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func _() {}
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func _() { f(1, 2, 3) }
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func _(x int) int { return x + 1 }
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func _() int { type T struct{} }
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func _(x int) int { y := x; return y + 1 }
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func _() int { type T struct{}; var x T; return x }
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// these must remain multi-line since they are multi-line in the source
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func _() {
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f(1, 2, 3)
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}
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func _(x int) int {
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y := x
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return y + 1
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}
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func _() int {
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type T struct{}
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var x T
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return x
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}
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// making function declarations safe for new semicolon rules
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func _() { /* one-line func */ }
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func _() { /* multi-line func because of comment */
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}
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func _() {
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/* one-line func */ }
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/* multi-line func because block is on multiple lines */
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}
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// ellipsis parameters
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src/pkg/go/printer/testdata/declarations.input
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13
src/pkg/go/printer/testdata/declarations.input
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@ -581,22 +581,27 @@ func _() {} // an empty line before this function
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func _() {}
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func _() {}
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func _() { f(1, 2, 3) }
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func _(x int) int { y := x; return y+1 }
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func _() int { type T struct{}; var x T; return x }
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// these must remain multi-line since they are multi-line in the source
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func _() {
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f(1, 2, 3)
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}
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func _(x int) int {
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return x+1
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y := x; return y+1
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}
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func _() int {
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type T struct{}
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type T struct{}; var x T; return x
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}
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// making function declarations safe for new semicolon rules
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func _() { /* one-line func */ }
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func _() { /* multi-line func because of comment */ }
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func _() {
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/* one-line func */ }
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/* multi-line func because block is on multiple lines */ }
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// ellipsis parameters
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src/pkg/go/printer/testdata/expressions.golden
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27
src/pkg/go/printer/testdata/expressions.golden
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@ -210,14 +210,31 @@ func _() {
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func _() {
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// one-line function literals
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// one-line function literals (body is on a single line)
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_ = func() {}
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_ = func() int { return 0 }
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_ = func(x, y int) bool { return x < y }
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_ = func(x, y int) bool { m := (x + y) / 2; return m < 0 }
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f(func() {})
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f(func() int { return 0 })
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f(func(x, y int) bool { return x < y })
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// multi-line function literals (body is not on one line)
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_ = func() {
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}
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_ = func() int {
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return 0
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}
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_ = func(x, y int) bool {
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m := (x + y) / 2
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return x < y
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}
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f(func() {
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})
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f(func() int {
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return 0
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})
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f(func(x, y int) bool {
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m := (x + y) / 2
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return x < y
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})
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}
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src/pkg/go/printer/testdata/expressions.input
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src/pkg/go/printer/testdata/expressions.input
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@ -206,22 +206,27 @@ _ = `foo
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func _() {
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// one-line function literals
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// one-line function literals (body is on a single line)
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_ = func() {}
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_ = func() int { return 0 }
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_ = func(x, y int) bool { m := (x+y)/2; return m < 0 }
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// multi-line function literals (body is not on one line)
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_ = func() {
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}
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_ = func() int {
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return 0
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}
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_ = func(x, y int) bool {
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return x < y
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}
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m := (x+y)/2; return x < y }
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f(func() {})
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f(func() {
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})
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f(func() int {
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return 0
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})
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f(func(x, y int) bool {
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return x < y
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})
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m := (x+y)/2; return x < y })
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}
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src/pkg/go/printer/testdata/expressions.raw
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27
src/pkg/go/printer/testdata/expressions.raw
vendored
@ -210,14 +210,31 @@ func _() {
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func _() {
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// one-line function literals
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// one-line function literals (body is on a single line)
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_ = func() {}
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_ = func() int { return 0 }
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_ = func(x, y int) bool { return x < y }
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_ = func(x, y int) bool { m := (x + y) / 2; return m < 0 }
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f(func() {})
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f(func() int { return 0 })
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f(func(x, y int) bool { return x < y })
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// multi-line function literals (body is not on one line)
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_ = func() {
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}
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_ = func() int {
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return 0
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}
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_ = func(x, y int) bool {
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m := (x + y) / 2
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return x < y
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}
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f(func() {
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})
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f(func() int {
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return 0
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})
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f(func(x, y int) bool {
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m := (x + y) / 2
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return x < y
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})
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}
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