1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
|
package main
import (
"errors"
"strings"
)
type TargetSpecificVar struct {
name string
v Var
op string
}
type Rule struct {
outputs []string
inputs []string
orderOnlyInputs []string
outputPatterns []string
isDoubleColon bool
isSuffixRule bool
vars []TargetSpecificVar
cmds []string
filename string
lineno int
cmdLineno int
}
func isPatternRule(s string) bool {
return strings.IndexByte(s, '%') >= 0
}
func (r *Rule) parseInputs(s string) {
inputs := splitSpaces(s)
isOrderOnly := false
for _, input := range inputs {
if input == "|" {
isOrderOnly = true
continue
}
if isOrderOnly {
r.orderOnlyInputs = append(r.orderOnlyInputs, input)
} else {
r.inputs = append(r.inputs, input)
}
}
}
func (r *Rule) parseVar(s string) *AssignAST {
eq := strings.IndexByte(s, '=')
if eq <= 0 {
return nil
}
assign := &AssignAST{
rhs: trimLeftSpace(s[eq+1:]),
}
assign.filename = r.filename
assign.lineno = r.lineno
// TODO(ukai): support override, export.
switch s[eq-1 : eq+1] {
case ":=":
assign.lhs = strings.TrimSpace(s[:eq-1])
assign.op = ":="
case "+=":
assign.lhs = strings.TrimSpace(s[:eq-1])
assign.op = "+="
case "?=":
assign.lhs = strings.TrimSpace(s[:eq-1])
assign.op = "?="
default:
assign.lhs = strings.TrimSpace(s[:eq])
assign.op = "="
}
return assign
}
func (r *Rule) parse(line string) (*AssignAST, error) {
index := strings.IndexByte(line, ':')
if index < 0 {
return nil, errors.New("*** missing separator.")
}
first := line[:index]
outputs := splitSpaces(first)
isFirstPattern := isPatternRule(first)
if isFirstPattern {
if len(outputs) > 1 {
return nil, errors.New("*** mixed implicit and normal rules: deprecated syntax")
}
r.outputPatterns = outputs
} else {
r.outputs = outputs
}
index++
if index < len(line) && line[index] == ':' {
r.isDoubleColon = true
index++
}
rest := line[index:]
if assign := r.parseVar(rest); assign != nil {
return assign, nil
}
index = strings.IndexByte(rest, ':')
if index < 0 {
r.parseInputs(rest)
return nil, nil
}
// %.x: %.y: %.z
if isFirstPattern {
return nil, errors.New("*** mixed implicit and normal rules: deprecated syntax")
}
second := rest[:index]
third := rest[index+1:]
r.outputs = outputs
r.outputPatterns = splitSpaces(second)
if len(r.outputPatterns) == 0 {
return nil, errors.New("*** missing target pattern.")
}
if len(r.outputPatterns) > 1 {
return nil, errors.New("*** multiple target patterns.")
}
if !isPatternRule(r.outputPatterns[0]) {
return nil, errors.New("*** target pattern contains no '%'.")
}
r.parseInputs(third)
return nil, nil
}
|
