Fumitoshi Ukai | 119dc91 | 2015-03-30 16:52:41 +0900 | [diff] [blame] | 1 | package main |
| 2 | |
| 3 | import ( |
| 4 | "bufio" |
Shinichiro Hamaji | e184158 | 2015-03-30 17:20:33 +0900 | [diff] [blame] | 5 | "bytes" |
Fumitoshi Ukai | 119dc91 | 2015-03-30 16:52:41 +0900 | [diff] [blame] | 6 | "errors" |
| 7 | "io" |
| 8 | "os" |
Fumitoshi Ukai | 119dc91 | 2015-03-30 16:52:41 +0900 | [diff] [blame] | 9 | ) |
| 10 | |
| 11 | type Makefile struct { |
| 12 | stmts []AST |
| 13 | } |
| 14 | |
| 15 | type parser struct { |
Fumitoshi Ukai | cf2b038 | 2015-03-30 17:48:54 +0900 | [diff] [blame] | 16 | rd *bufio.Reader |
| 17 | mk Makefile |
| 18 | lineno int |
| 19 | elineno int // lineno == elineno unless there is trailing '\'. |
| 20 | unBuf []byte |
| 21 | hasUnBuf bool |
| 22 | done bool |
Fumitoshi Ukai | 119dc91 | 2015-03-30 16:52:41 +0900 | [diff] [blame] | 23 | } |
| 24 | |
| 25 | func exists(filename string) bool { |
| 26 | f, err := os.Open(filename) |
| 27 | if err != nil { |
| 28 | return false |
| 29 | } |
| 30 | f.Close() |
| 31 | return true |
| 32 | } |
| 33 | |
| 34 | func isdigit(ch byte) bool { |
| 35 | return ch >= '0' && ch <= '9' |
| 36 | } |
| 37 | |
| 38 | func isident(ch byte) bool { |
| 39 | return (ch >= 'A' && ch <= 'Z' || ch >= 'a' && ch <= 'z' || ch == '_' || ch == '.') |
| 40 | } |
| 41 | |
| 42 | func newParser(rd io.Reader) *parser { |
| 43 | return &parser{ |
| 44 | rd: bufio.NewReader(rd), |
| 45 | } |
| 46 | } |
| 47 | |
Shinichiro Hamaji | e184158 | 2015-03-30 17:20:33 +0900 | [diff] [blame] | 48 | func (p *parser) readLine() []byte { |
Fumitoshi Ukai | cf2b038 | 2015-03-30 17:48:54 +0900 | [diff] [blame] | 49 | if p.hasUnBuf { |
| 50 | p.hasUnBuf = false |
| 51 | return p.unBuf |
Shinichiro Hamaji | e184158 | 2015-03-30 17:20:33 +0900 | [diff] [blame] | 52 | } |
| 53 | |
| 54 | p.lineno = p.elineno |
| 55 | line, err := p.rd.ReadBytes('\n') |
| 56 | p.lineno++ |
| 57 | if err == io.EOF { |
| 58 | p.done = true |
| 59 | } else if err != nil { |
| 60 | panic(err) |
| 61 | } |
| 62 | |
| 63 | if len(line) > 0 { |
| 64 | line = line[0 : len(line)-1] |
| 65 | } |
| 66 | |
| 67 | // TODO: Handle \\ at the end of the line? |
| 68 | for len(line) > 0 && line[len(line)-1] == '\\' { |
| 69 | line = line[:len(line)-1] |
| 70 | nline := p.readLine() |
| 71 | p.elineno++ |
| 72 | line = append(line, nline...) |
| 73 | } |
| 74 | |
| 75 | index := bytes.IndexByte(line, '#') |
| 76 | if index >= 0 { |
| 77 | line = line[:index] |
| 78 | } |
| 79 | |
| 80 | return line |
| 81 | } |
| 82 | |
| 83 | func (p *parser) unreadLine(line []byte) { |
Fumitoshi Ukai | cf2b038 | 2015-03-30 17:48:54 +0900 | [diff] [blame] | 84 | if p.hasUnBuf { |
Shinichiro Hamaji | e184158 | 2015-03-30 17:20:33 +0900 | [diff] [blame] | 85 | panic("unreadLine twice!") |
| 86 | } |
Fumitoshi Ukai | cf2b038 | 2015-03-30 17:48:54 +0900 | [diff] [blame] | 87 | p.unBuf = line |
| 88 | p.hasUnBuf = true |
Shinichiro Hamaji | e184158 | 2015-03-30 17:20:33 +0900 | [diff] [blame] | 89 | } |
| 90 | |
Fumitoshi Ukai | 119dc91 | 2015-03-30 16:52:41 +0900 | [diff] [blame] | 91 | func (p *parser) readByte() (byte, error) { |
| 92 | ch, err := p.rd.ReadByte() |
| 93 | if err != nil { |
| 94 | p.done = true |
| 95 | } |
| 96 | return ch, err |
| 97 | } |
| 98 | |
| 99 | func (p *parser) unreadByte() { |
| 100 | p.rd.UnreadByte() |
| 101 | } |
| 102 | |
| 103 | func (p *parser) skipWhiteSpaces() error { |
| 104 | for { |
| 105 | ch, err := p.readByte() |
| 106 | if err != nil { |
| 107 | return err |
| 108 | } |
| 109 | switch ch { |
| 110 | case '\n': |
| 111 | p.lineno++ |
| 112 | fallthrough |
| 113 | case '\r', ' ': |
| 114 | continue |
| 115 | default: |
| 116 | p.unreadByte() |
| 117 | return nil |
| 118 | } |
| 119 | } |
| 120 | } |
| 121 | |
| 122 | func (p *parser) getNextToken() (string, error) { |
| 123 | if err := p.skipWhiteSpaces(); err != nil { |
| 124 | return "", err |
| 125 | } |
| 126 | ch, err := p.readByte() |
| 127 | if err != nil { |
| 128 | return "", errors.New("TODO") |
| 129 | } |
| 130 | switch ch { |
| 131 | case '$', '=': |
| 132 | return string(ch), nil |
| 133 | case ':': |
| 134 | var s []byte |
| 135 | s = append(s, ch) |
| 136 | ch, err := p.readByte() |
| 137 | if ch == ':' { |
| 138 | ch, err = p.readByte() |
| 139 | } |
| 140 | if err != nil { |
| 141 | return string(s), err |
| 142 | } |
| 143 | if ch == '=' { |
| 144 | s = append(s, ch) |
| 145 | } else { |
| 146 | p.unreadByte() |
| 147 | } |
| 148 | return string(s), nil |
| 149 | default: |
| 150 | if isident(ch) { |
| 151 | var s []byte |
| 152 | s = append(s, ch) |
| 153 | for { |
| 154 | ch, err := p.readByte() |
| 155 | if err != nil { |
| 156 | return string(s), err |
| 157 | } |
| 158 | if isident(ch) || isdigit(ch) { |
| 159 | s = append(s, ch) |
| 160 | } else { |
| 161 | p.unreadByte() |
| 162 | return string(s), nil |
| 163 | } |
| 164 | } |
| 165 | } |
| 166 | } |
| 167 | |
| 168 | return "", errors.New("foobar") |
| 169 | } |
| 170 | |
| 171 | func (p *parser) readUntilEol() string { |
| 172 | var r []byte |
| 173 | for { |
| 174 | ch, err := p.readByte() |
| 175 | if err != nil || ch == '\n' { |
| 176 | return string(r) |
| 177 | } |
| 178 | r = append(r, ch) |
| 179 | } |
| 180 | } |
| 181 | |
Shinichiro Hamaji | 7f1ede3 | 2015-03-30 18:05:22 +0900 | [diff] [blame^] | 182 | func (p *parser) parseAssign(line []byte, sep int, typ int) AST { |
| 183 | Log("parseAssign %s %d", line, sep) |
| 184 | esep := sep + 1 |
| 185 | if typ != ASSIGN_RECURSIVE { |
| 186 | esep++ |
| 187 | } |
| 188 | lhs := string(bytes.TrimSpace(line[:sep])) |
| 189 | rhs := string(bytes.TrimLeft(line[esep:], " \t")) |
| 190 | ast := &AssignAST{lhs: lhs, rhs: rhs, assign_type: typ} |
Fumitoshi Ukai | 119dc91 | 2015-03-30 16:52:41 +0900 | [diff] [blame] | 191 | ast.lineno = p.lineno |
Fumitoshi Ukai | 119dc91 | 2015-03-30 16:52:41 +0900 | [diff] [blame] | 192 | return ast |
| 193 | } |
| 194 | |
Shinichiro Hamaji | 7f1ede3 | 2015-03-30 18:05:22 +0900 | [diff] [blame^] | 195 | func (p *parser) parseRule(line []byte, sep int) AST { |
| 196 | lhs := string(bytes.TrimSpace(line[:sep])) |
| 197 | rhs := string(bytes.TrimSpace(line[sep+1:])) |
| 198 | ast := &RuleAST{ |
| 199 | lhs: lhs, |
| 200 | rhs: rhs, |
| 201 | } |
Fumitoshi Ukai | 119dc91 | 2015-03-30 16:52:41 +0900 | [diff] [blame] | 202 | ast.lineno = p.lineno |
Fumitoshi Ukai | 119dc91 | 2015-03-30 16:52:41 +0900 | [diff] [blame] | 203 | for { |
Shinichiro Hamaji | 7f1ede3 | 2015-03-30 18:05:22 +0900 | [diff] [blame^] | 204 | line := p.readLine() |
| 205 | if len(line) == 0 { |
| 206 | break |
| 207 | } else if line[0] == '\t' { |
| 208 | ast.cmds = append(ast.cmds, string(bytes.TrimSpace(line))) |
| 209 | } else { |
| 210 | p.unreadLine(line) |
| 211 | break |
Fumitoshi Ukai | 119dc91 | 2015-03-30 16:52:41 +0900 | [diff] [blame] | 212 | } |
| 213 | } |
Shinichiro Hamaji | 7f1ede3 | 2015-03-30 18:05:22 +0900 | [diff] [blame^] | 214 | return ast |
Fumitoshi Ukai | 119dc91 | 2015-03-30 16:52:41 +0900 | [diff] [blame] | 215 | } |
| 216 | |
| 217 | func (p *parser) parse() (Makefile, error) { |
Shinichiro Hamaji | e184158 | 2015-03-30 17:20:33 +0900 | [diff] [blame] | 218 | for !p.done { |
| 219 | line := p.readLine() |
| 220 | |
Shinichiro Hamaji | 7f1ede3 | 2015-03-30 18:05:22 +0900 | [diff] [blame^] | 221 | var ast AST |
Shinichiro Hamaji | e184158 | 2015-03-30 17:20:33 +0900 | [diff] [blame] | 222 | for i, ch := range line { |
| 223 | switch ch { |
| 224 | case ':': |
Shinichiro Hamaji | 7f1ede3 | 2015-03-30 18:05:22 +0900 | [diff] [blame^] | 225 | if i+1 < len(line) && line[i+1] == '=' { |
| 226 | ast = p.parseAssign(line, i, ASSIGN_SIMPLE) |
| 227 | } else { |
| 228 | ast = p.parseRule(line, i) |
Shinichiro Hamaji | e184158 | 2015-03-30 17:20:33 +0900 | [diff] [blame] | 229 | } |
Shinichiro Hamaji | e184158 | 2015-03-30 17:20:33 +0900 | [diff] [blame] | 230 | case '=': |
Shinichiro Hamaji | 7f1ede3 | 2015-03-30 18:05:22 +0900 | [diff] [blame^] | 231 | ast = p.parseAssign(line, i, ASSIGN_RECURSIVE) |
Shinichiro Hamaji | e184158 | 2015-03-30 17:20:33 +0900 | [diff] [blame] | 232 | case '?': |
| 233 | panic("TODO") |
| 234 | } |
Shinichiro Hamaji | 7f1ede3 | 2015-03-30 18:05:22 +0900 | [diff] [blame^] | 235 | if ast != nil { |
| 236 | p.mk.stmts = append(p.mk.stmts, ast) |
| 237 | break |
| 238 | } |
Fumitoshi Ukai | 119dc91 | 2015-03-30 16:52:41 +0900 | [diff] [blame] | 239 | } |
Fumitoshi Ukai | 119dc91 | 2015-03-30 16:52:41 +0900 | [diff] [blame] | 240 | } |
| 241 | return p.mk, nil |
| 242 | } |
| 243 | |
| 244 | func ParseMakefile(filename string) (Makefile, error) { |
| 245 | f, err := os.Open(filename) |
| 246 | if err != nil { |
| 247 | return Makefile{}, err |
| 248 | } |
Fumitoshi Ukai | cf2b038 | 2015-03-30 17:48:54 +0900 | [diff] [blame] | 249 | defer f.Close() |
Fumitoshi Ukai | 119dc91 | 2015-03-30 16:52:41 +0900 | [diff] [blame] | 250 | parser := newParser(f) |
| 251 | return parser.parse() |
| 252 | } |
| 253 | |
| 254 | func ParseDefaultMakefile() (Makefile, error) { |
| 255 | candidates := []string{"GNUmakefile", "makefile", "Makefile"} |
| 256 | for _, filename := range candidates { |
| 257 | if exists(filename) { |
| 258 | return ParseMakefile(filename) |
| 259 | } |
| 260 | } |
Fumitoshi Ukai | cf2b038 | 2015-03-30 17:48:54 +0900 | [diff] [blame] | 261 | return Makefile{}, errors.New("no targets specified and no makefile found.") |
Fumitoshi Ukai | 119dc91 | 2015-03-30 16:52:41 +0900 | [diff] [blame] | 262 | } |