Shinichiro Hamaji | 0493261 | 2015-03-31 23:46:56 +0900 | [diff] [blame] | 1 | package main |
| 2 | |
| 3 | import ( |
Fumitoshi Ukai | 953ce6f | 2015-04-04 00:38:53 +0900 | [diff] [blame] | 4 | "errors" |
Shinichiro Hamaji | 0493261 | 2015-03-31 23:46:56 +0900 | [diff] [blame] | 5 | "strings" |
| 6 | ) |
| 7 | |
| 8 | type Rule struct { |
Shinichiro Hamaji | 5c53b57 | 2015-04-02 05:36:42 +0900 | [diff] [blame] | 9 | outputs []string |
| 10 | inputs []string |
| 11 | orderOnlyInputs []string |
| 12 | outputPatterns []string |
| 13 | isDoubleColon bool |
| 14 | isSuffixRule bool |
Fumitoshi Ukai | 953ce6f | 2015-04-04 00:38:53 +0900 | [diff] [blame] | 15 | vars *VarTab |
Shinichiro Hamaji | 5c53b57 | 2015-04-02 05:36:42 +0900 | [diff] [blame] | 16 | cmds []string |
| 17 | filename string |
| 18 | lineno int |
| 19 | cmdLineno int |
Shinichiro Hamaji | 0493261 | 2015-03-31 23:46:56 +0900 | [diff] [blame] | 20 | } |
| 21 | |
Shinichiro Hamaji | 21a9b5f | 2015-04-01 02:42:59 +0900 | [diff] [blame] | 22 | func isPatternRule(s string) bool { |
| 23 | return strings.IndexByte(s, '%') >= 0 |
| 24 | } |
| 25 | |
Shinichiro Hamaji | 5c53b57 | 2015-04-02 05:36:42 +0900 | [diff] [blame] | 26 | func (r *Rule) parseInputs(s string) { |
| 27 | inputs := splitSpaces(s) |
| 28 | isOrderOnly := false |
| 29 | for _, input := range inputs { |
| 30 | if input == "|" { |
| 31 | isOrderOnly = true |
| 32 | continue |
| 33 | } |
| 34 | if isOrderOnly { |
| 35 | r.orderOnlyInputs = append(r.orderOnlyInputs, input) |
| 36 | } else { |
| 37 | r.inputs = append(r.inputs, input) |
| 38 | } |
| 39 | } |
| 40 | } |
| 41 | |
Fumitoshi Ukai | 953ce6f | 2015-04-04 00:38:53 +0900 | [diff] [blame] | 42 | func (r *Rule) parseVar(s string) *AssignAST { |
| 43 | eq := strings.IndexByte(s, '=') |
| 44 | if eq <= 0 { |
| 45 | return nil |
| 46 | } |
| 47 | assign := &AssignAST{ |
| 48 | rhs: strings.TrimLeft(s[eq+1:], " \t"), |
| 49 | } |
| 50 | assign.filename = r.filename |
| 51 | assign.lineno = r.lineno |
| 52 | // TODO(ukai): support override, export. |
Fumitoshi Ukai | 3ef5fcc | 2015-04-06 17:21:43 +0900 | [diff] [blame] | 53 | switch s[eq-1 : eq+1] { |
Fumitoshi Ukai | 953ce6f | 2015-04-04 00:38:53 +0900 | [diff] [blame] | 54 | case ":=": |
| 55 | assign.lhs = strings.TrimSpace(s[:eq-1]) |
| 56 | assign.op = ":=" |
| 57 | case "+=": |
| 58 | assign.lhs = strings.TrimSpace(s[:eq-1]) |
| 59 | assign.op = "+=" |
| 60 | case "?=": |
| 61 | assign.lhs = strings.TrimSpace(s[:eq-1]) |
| 62 | assign.op = "?=" |
| 63 | default: |
| 64 | assign.lhs = strings.TrimSpace(s[:eq]) |
| 65 | assign.op = "=" |
| 66 | } |
| 67 | return assign |
| 68 | } |
| 69 | |
| 70 | func (r *Rule) parse(line string) (*AssignAST, error) { |
Shinichiro Hamaji | 21a9b5f | 2015-04-01 02:42:59 +0900 | [diff] [blame] | 71 | index := strings.IndexByte(line, ':') |
| 72 | if index < 0 { |
Fumitoshi Ukai | 953ce6f | 2015-04-04 00:38:53 +0900 | [diff] [blame] | 73 | return nil, errors.New("*** missing separator.") |
Shinichiro Hamaji | 0493261 | 2015-03-31 23:46:56 +0900 | [diff] [blame] | 74 | } |
| 75 | |
Shinichiro Hamaji | 21a9b5f | 2015-04-01 02:42:59 +0900 | [diff] [blame] | 76 | first := line[:index] |
| 77 | outputs := splitSpaces(first) |
| 78 | isFirstPattern := isPatternRule(first) |
| 79 | if isFirstPattern { |
| 80 | if len(outputs) > 1 { |
Fumitoshi Ukai | 953ce6f | 2015-04-04 00:38:53 +0900 | [diff] [blame] | 81 | return nil, errors.New("*** mixed implicit and normal rules: deprecated syntax") |
Shinichiro Hamaji | 21a9b5f | 2015-04-01 02:42:59 +0900 | [diff] [blame] | 82 | } |
| 83 | r.outputPatterns = outputs |
| 84 | } else { |
| 85 | r.outputs = outputs |
| 86 | } |
| 87 | |
| 88 | index++ |
| 89 | if index < len(line) && line[index] == ':' { |
| 90 | r.isDoubleColon = true |
| 91 | index++ |
| 92 | } |
| 93 | |
| 94 | rest := line[index:] |
Fumitoshi Ukai | 953ce6f | 2015-04-04 00:38:53 +0900 | [diff] [blame] | 95 | if assign := r.parseVar(rest); assign != nil { |
| 96 | return assign, nil |
| 97 | } |
Shinichiro Hamaji | 21a9b5f | 2015-04-01 02:42:59 +0900 | [diff] [blame] | 98 | index = strings.IndexByte(rest, ':') |
| 99 | if index < 0 { |
Shinichiro Hamaji | 5c53b57 | 2015-04-02 05:36:42 +0900 | [diff] [blame] | 100 | r.parseInputs(rest) |
Fumitoshi Ukai | 953ce6f | 2015-04-04 00:38:53 +0900 | [diff] [blame] | 101 | return nil, nil |
Shinichiro Hamaji | 21a9b5f | 2015-04-01 02:42:59 +0900 | [diff] [blame] | 102 | } |
| 103 | |
| 104 | // %.x: %.y: %.z |
| 105 | if isFirstPattern { |
Fumitoshi Ukai | 953ce6f | 2015-04-04 00:38:53 +0900 | [diff] [blame] | 106 | return nil, errors.New("*** mixed implicit and normal rules: deprecated syntax") |
Shinichiro Hamaji | 21a9b5f | 2015-04-01 02:42:59 +0900 | [diff] [blame] | 107 | } |
| 108 | |
| 109 | second := rest[:index] |
| 110 | third := rest[index+1:] |
| 111 | |
| 112 | r.outputs = outputs |
| 113 | r.outputPatterns = splitSpaces(second) |
| 114 | if len(r.outputPatterns) == 0 { |
Fumitoshi Ukai | 953ce6f | 2015-04-04 00:38:53 +0900 | [diff] [blame] | 115 | return nil, errors.New("*** missing target pattern.") |
Shinichiro Hamaji | 21a9b5f | 2015-04-01 02:42:59 +0900 | [diff] [blame] | 116 | } |
| 117 | if len(r.outputPatterns) > 1 { |
Fumitoshi Ukai | 953ce6f | 2015-04-04 00:38:53 +0900 | [diff] [blame] | 118 | return nil, errors.New("*** multiple target patterns.") |
Shinichiro Hamaji | 21a9b5f | 2015-04-01 02:42:59 +0900 | [diff] [blame] | 119 | } |
| 120 | if !isPatternRule(r.outputPatterns[0]) { |
Fumitoshi Ukai | 953ce6f | 2015-04-04 00:38:53 +0900 | [diff] [blame] | 121 | return nil, errors.New("*** target pattern contains no '%'.") |
Shinichiro Hamaji | 21a9b5f | 2015-04-01 02:42:59 +0900 | [diff] [blame] | 122 | } |
Shinichiro Hamaji | 5c53b57 | 2015-04-02 05:36:42 +0900 | [diff] [blame] | 123 | r.parseInputs(third) |
Shinichiro Hamaji | 21a9b5f | 2015-04-01 02:42:59 +0900 | [diff] [blame] | 124 | |
Fumitoshi Ukai | 953ce6f | 2015-04-04 00:38:53 +0900 | [diff] [blame] | 125 | return nil, nil |
Shinichiro Hamaji | 0493261 | 2015-03-31 23:46:56 +0900 | [diff] [blame] | 126 | } |