124 lines
2.6 KiB
Go
124 lines
2.6 KiB
Go
// Copyright 2017 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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type Pos int
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const NoPos Pos = 0
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type Node interface {
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Dump() string
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Pos() Pos
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End() Pos
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}
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type Assignment struct {
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Target *MakeString
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Name *MakeString
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Value *MakeString
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Type string
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}
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func (x *Assignment) Dump() string {
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target := ""
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if x.Target != nil {
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target = x.Target.Dump() + ": "
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}
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return target + x.Name.Dump() + " " + x.Type + " " + x.Value.Dump()
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}
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func (x *Assignment) Pos() Pos {
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if x.Target != nil {
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return x.Target.Pos()
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}
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return x.Name.Pos()
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}
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func (x *Assignment) End() Pos { return x.Value.End() }
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type Comment struct {
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CommentPos Pos
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Comment string
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}
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func (x *Comment) Dump() string {
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return "#" + x.Comment
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}
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func (x *Comment) Pos() Pos { return x.CommentPos }
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func (x *Comment) End() Pos { return Pos(int(x.CommentPos) + len(x.Comment)) }
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type Directive struct {
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NamePos Pos
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Name string
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Args *MakeString
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EndPos Pos
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}
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func (x *Directive) Dump() string {
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return x.Name + " " + x.Args.Dump()
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}
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func (x *Directive) Pos() Pos { return x.NamePos }
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func (x *Directive) End() Pos {
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if x.EndPos != NoPos {
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return x.EndPos
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}
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return x.Args.End()
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}
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type Rule struct {
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Target *MakeString
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Prerequisites *MakeString
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RecipePos Pos
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Recipe string
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}
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func (x *Rule) Dump() string {
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recipe := ""
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if x.Recipe != "" {
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recipe = "\n" + x.Recipe
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}
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return "rule: " + x.Target.Dump() + ": " + x.Prerequisites.Dump() + recipe
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}
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func (x *Rule) Pos() Pos { return x.Target.Pos() }
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func (x *Rule) End() Pos { return Pos(int(x.RecipePos) + len(x.Recipe)) }
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type Variable struct {
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Name *MakeString
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}
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func (x *Variable) Pos() Pos { return x.Name.Pos() }
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func (x *Variable) End() Pos { return x.Name.End() }
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func (x *Variable) Dump() string {
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return "$(" + x.Name.Dump() + ")"
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}
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// Sort interface for []Node by position
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type byPosition []Node
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func (s byPosition) Len() int {
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return len(s)
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}
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func (s byPosition) Swap(i, j int) {
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s[i], s[j] = s[j], s[i]
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}
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func (s byPosition) Less(i, j int) bool {
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return s[i].Pos() < s[j].Pos()
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}
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