1// Copyright 2017 Google Inc. All rights reserved. 2// 3// Licensed under the Apache License, Version 2.0 (the "License"); 4// you may not use this file except in compliance with the License. 5// You may obtain a copy of the License at 6// 7// http://www.apache.org/licenses/LICENSE-2.0 8// 9// Unless required by applicable law or agreed to in writing, software 10// distributed under the License is distributed on an "AS IS" BASIS, 11// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 12// See the License for the specific language governing permissions and 13// limitations under the License. 14 15package parser 16 17type Pos int 18 19const NoPos Pos = 0 20 21type Node interface { 22 Dump() string 23 Pos() Pos 24 End() Pos 25} 26 27type Assignment struct { 28 Target *MakeString 29 Name *MakeString 30 Value *MakeString 31 Type string 32} 33 34func (x *Assignment) Dump() string { 35 target := "" 36 if x.Target != nil { 37 target = x.Target.Dump() + ": " 38 } 39 return target + x.Name.Dump() + " " + x.Type + " " + x.Value.Dump() 40} 41 42func (x *Assignment) Pos() Pos { 43 if x.Target != nil { 44 return x.Target.Pos() 45 } 46 return x.Name.Pos() 47} 48 49func (x *Assignment) End() Pos { return x.Value.End() } 50 51type Comment struct { 52 CommentPos Pos 53 Comment string 54} 55 56func (x *Comment) Dump() string { 57 return "#" + x.Comment 58} 59 60func (x *Comment) Pos() Pos { return x.CommentPos } 61func (x *Comment) End() Pos { return Pos(int(x.CommentPos) + len(x.Comment)) } 62 63type Directive struct { 64 NamePos Pos 65 Name string 66 Args *MakeString 67 EndPos Pos 68} 69 70func (x *Directive) Dump() string { 71 return x.Name + " " + x.Args.Dump() 72} 73 74func (x *Directive) Pos() Pos { return x.NamePos } 75func (x *Directive) End() Pos { 76 if x.EndPos != NoPos { 77 return x.EndPos 78 } 79 return x.Args.End() 80} 81 82type Rule struct { 83 Target *MakeString 84 Prerequisites *MakeString 85 RecipePos Pos 86 Recipe string 87} 88 89func (x *Rule) Dump() string { 90 recipe := "" 91 if x.Recipe != "" { 92 recipe = "\n" + x.Recipe 93 } 94 return "rule: " + x.Target.Dump() + ": " + x.Prerequisites.Dump() + recipe 95} 96 97func (x *Rule) Pos() Pos { return x.Target.Pos() } 98func (x *Rule) End() Pos { return Pos(int(x.RecipePos) + len(x.Recipe)) } 99 100type Variable struct { 101 Name *MakeString 102} 103 104func (x *Variable) Pos() Pos { return x.Name.Pos() } 105func (x *Variable) End() Pos { return x.Name.End() } 106 107func (x *Variable) Dump() string { 108 return "$(" + x.Name.Dump() + ")" 109} 110 111// Sort interface for []Node by position 112type byPosition []Node 113 114func (s byPosition) Len() int { 115 return len(s) 116} 117 118func (s byPosition) Swap(i, j int) { 119 s[i], s[j] = s[j], s[i] 120} 121 122func (s byPosition) Less(i, j int) bool { 123 return s[i].Pos() < s[j].Pos() 124} 125