ba5bf880bf
value.Type and value.Pos changed to methods, change the users that were not caught by error checking to use Type() or Pos(). Change-Id: I295a658c007fa2de68c89fb85ee367fbea5ed1aa
365 lines
8.6 KiB
Go
365 lines
8.6 KiB
Go
// Copyright 2014 Google Inc. All rights reserved.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package parser
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import (
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"fmt"
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"strconv"
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"strings"
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"text/scanner"
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"unicode"
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)
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var noPos scanner.Position
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type printer struct {
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defs []Definition
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comments []*CommentGroup
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curComment int
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pos scanner.Position
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pendingSpace bool
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pendingNewline int
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output []byte
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indentList []int
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wsBuf []byte
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skippedComments []*CommentGroup
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}
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func newPrinter(file *File) *printer {
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return &printer{
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defs: file.Defs,
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comments: file.Comments,
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indentList: []int{0},
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// pendingNewLine is initialized to -1 to eat initial spaces if the first token is a comment
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pendingNewline: -1,
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pos: scanner.Position{
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Line: 1,
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},
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}
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}
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func Print(file *File) ([]byte, error) {
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p := newPrinter(file)
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for _, def := range p.defs {
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p.printDef(def)
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}
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p.flush()
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return p.output, nil
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}
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func (p *printer) Print() ([]byte, error) {
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for _, def := range p.defs {
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p.printDef(def)
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}
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p.flush()
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return p.output, nil
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}
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func (p *printer) printDef(def Definition) {
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if assignment, ok := def.(*Assignment); ok {
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p.printAssignment(assignment)
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} else if module, ok := def.(*Module); ok {
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p.printModule(module)
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} else {
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panic("Unknown definition")
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}
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}
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func (p *printer) printAssignment(assignment *Assignment) {
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p.printToken(assignment.Name, assignment.NamePos)
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p.requestSpace()
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p.printToken(assignment.Assigner, assignment.EqualsPos)
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p.requestSpace()
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p.printExpression(assignment.OrigValue)
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p.requestNewline()
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}
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func (p *printer) printModule(module *Module) {
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p.printToken(module.Type, module.TypePos)
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p.printMap(&module.Map)
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p.requestDoubleNewline()
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}
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func (p *printer) printExpression(value Expression) {
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switch v := value.(type) {
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case *Variable:
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p.printToken(v.Name, v.NamePos)
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case *Operator:
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p.printOperator(v)
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case *Bool:
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var s string
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if v.Value {
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s = "true"
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} else {
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s = "false"
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}
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p.printToken(s, v.LiteralPos)
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case *String:
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p.printToken(strconv.Quote(v.Value), v.LiteralPos)
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case *List:
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p.printList(v.Values, v.LBracePos, v.RBracePos)
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case *Map:
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p.printMap(v)
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default:
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panic(fmt.Errorf("bad property type: %s", value.Type()))
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}
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}
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func (p *printer) printList(list []Expression, pos, endPos scanner.Position) {
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p.requestSpace()
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p.printToken("[", pos)
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if len(list) > 1 || pos.Line != endPos.Line {
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p.requestNewline()
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p.indent(p.curIndent() + 4)
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for _, value := range list {
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p.printExpression(value)
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p.printToken(",", noPos)
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p.requestNewline()
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}
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p.unindent(endPos)
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} else {
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for _, value := range list {
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p.printExpression(value)
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}
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}
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p.printToken("]", endPos)
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}
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func (p *printer) printMap(m *Map) {
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p.requestSpace()
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p.printToken("{", m.LBracePos)
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if len(m.Properties) > 0 || m.LBracePos.Line != m.RBracePos.Line {
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p.requestNewline()
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p.indent(p.curIndent() + 4)
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for _, prop := range m.Properties {
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p.printProperty(prop)
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p.printToken(",", noPos)
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p.requestNewline()
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}
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p.unindent(m.RBracePos)
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}
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p.printToken("}", m.RBracePos)
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}
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func (p *printer) printOperator(operator *Operator) {
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p.printExpression(operator.Args[0])
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p.requestSpace()
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p.printToken(string(operator.Operator), operator.OperatorPos)
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if operator.Args[0].End().Line == operator.Args[1].Pos().Line {
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p.requestSpace()
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} else {
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p.requestNewline()
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}
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p.printExpression(operator.Args[1])
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}
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func (p *printer) printProperty(property *Property) {
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p.printToken(property.Name, property.NamePos)
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p.printToken(":", property.ColonPos)
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p.requestSpace()
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p.printExpression(property.Value)
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}
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// Print a single token, including any necessary comments or whitespace between
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// this token and the previously printed token
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func (p *printer) printToken(s string, pos scanner.Position) {
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newline := p.pendingNewline != 0
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if pos == noPos {
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pos = p.pos
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}
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if newline {
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p.printEndOfLineCommentsBefore(pos)
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p.requestNewlinesForPos(pos)
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}
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p.printInLineCommentsBefore(pos)
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p.flushSpace()
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p.output = append(p.output, s...)
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p.pos = pos
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}
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// Print any in-line (single line /* */) comments that appear _before_ pos
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func (p *printer) printInLineCommentsBefore(pos scanner.Position) {
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for p.curComment < len(p.comments) && p.comments[p.curComment].Pos().Offset < pos.Offset {
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c := p.comments[p.curComment]
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if c.Comments[0].Comment[0][0:2] == "//" || len(c.Comments[0].Comment) > 1 {
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p.skippedComments = append(p.skippedComments, c)
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} else {
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p.printComment(c)
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p.requestSpace()
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}
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p.curComment++
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}
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}
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// Print any comments, including end of line comments, that appear _before_ the line specified
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// by pos
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func (p *printer) printEndOfLineCommentsBefore(pos scanner.Position) {
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if len(p.skippedComments) > 0 {
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for _, c := range p.skippedComments {
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p.printComment(c)
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}
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p._requestNewline()
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p.skippedComments = nil
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}
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for p.curComment < len(p.comments) && p.comments[p.curComment].Pos().Line < pos.Line {
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c := p.comments[p.curComment]
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p.printComment(c)
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p._requestNewline()
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p.curComment++
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}
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}
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// Compare the line numbers of the previous and current positions to determine whether extra
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// newlines should be inserted. A second newline is allowed anywhere requestNewline() is called.
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func (p *printer) requestNewlinesForPos(pos scanner.Position) bool {
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if pos.Line > p.pos.Line {
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p._requestNewline()
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if pos.Line > p.pos.Line+1 {
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p.pendingNewline = 2
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}
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return true
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}
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return false
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}
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func (p *printer) requestSpace() {
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p.pendingSpace = true
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}
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// Ask for a newline to be inserted before the next token, but do not insert any comments. Used
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// by the comment printers.
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func (p *printer) _requestNewline() {
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if p.pendingNewline == 0 {
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p.pendingNewline = 1
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}
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}
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// Ask for a newline to be inserted before the next token. Also inserts any end-of line comments
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// for the current line
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func (p *printer) requestNewline() {
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pos := p.pos
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pos.Line++
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p.printEndOfLineCommentsBefore(pos)
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p._requestNewline()
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}
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// Ask for two newlines to be inserted before the next token. Also inserts any end-of line comments
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// for the current line
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func (p *printer) requestDoubleNewline() {
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p.requestNewline()
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p.pendingNewline = 2
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}
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// Flush any pending whitespace, ignoring pending spaces if there is a pending newline
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func (p *printer) flushSpace() {
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if p.pendingNewline == 1 {
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p.output = append(p.output, '\n')
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p.pad(p.curIndent())
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} else if p.pendingNewline == 2 {
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p.output = append(p.output, "\n\n"...)
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p.pad(p.curIndent())
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} else if p.pendingSpace == true && p.pendingNewline != -1 {
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p.output = append(p.output, ' ')
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}
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p.pendingSpace = false
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p.pendingNewline = 0
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}
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// Print a single comment, which may be a multi-line comment
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func (p *printer) printComment(cg *CommentGroup) {
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for _, comment := range cg.Comments {
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if !p.requestNewlinesForPos(comment.Pos()) {
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p.requestSpace()
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}
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for i, line := range comment.Comment {
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line = strings.TrimRightFunc(line, unicode.IsSpace)
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p.flushSpace()
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if i != 0 {
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lineIndent := strings.IndexFunc(line, func(r rune) bool { return !unicode.IsSpace(r) })
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lineIndent = max(lineIndent, p.curIndent())
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p.pad(lineIndent - p.curIndent())
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}
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p.output = append(p.output, strings.TrimSpace(line)...)
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if i < len(comment.Comment)-1 {
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p._requestNewline()
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}
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}
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p.pos = comment.End()
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}
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}
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// Print any comments that occur after the last token, and a trailing newline
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func (p *printer) flush() {
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for _, c := range p.skippedComments {
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if !p.requestNewlinesForPos(c.Pos()) {
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p.requestSpace()
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}
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p.printComment(c)
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}
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for p.curComment < len(p.comments) {
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p.printComment(p.comments[p.curComment])
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p.curComment++
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}
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p.output = append(p.output, '\n')
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}
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// Print whitespace to pad from column l to column max
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func (p *printer) pad(l int) {
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if l > len(p.wsBuf) {
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p.wsBuf = make([]byte, l)
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for i := range p.wsBuf {
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p.wsBuf[i] = ' '
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}
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}
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p.output = append(p.output, p.wsBuf[0:l]...)
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}
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func (p *printer) indent(i int) {
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p.indentList = append(p.indentList, i)
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}
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func (p *printer) unindent(pos scanner.Position) {
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p.printEndOfLineCommentsBefore(pos)
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p.indentList = p.indentList[0 : len(p.indentList)-1]
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}
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func (p *printer) curIndent() int {
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return p.indentList[len(p.indentList)-1]
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}
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func max(a, b int) int {
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if a > b {
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return a
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} else {
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return b
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}
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}
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