|
66
|
1 package gcss
|
|
|
2
|
|
|
3 import "strings"
|
|
|
4
|
|
|
5 // Special characters
|
|
|
6 const (
|
|
|
7 cr = "\r"
|
|
|
8 lf = "\n"
|
|
|
9 crlf = "\r\n"
|
|
|
10 space = " "
|
|
|
11 colon = ":"
|
|
|
12 comma = ","
|
|
|
13 openBrace = "{"
|
|
|
14 closeBrace = "}"
|
|
|
15 semicolon = ";"
|
|
|
16 ampersand = "&"
|
|
|
17 atMark = "@"
|
|
|
18 dollarMark = "$"
|
|
|
19 openParenthesis = "("
|
|
|
20 closeParenthesis = ")"
|
|
|
21 slash = "/"
|
|
|
22 doubleSlash = slash + slash
|
|
|
23 )
|
|
|
24
|
|
|
25 // parse parses the string, generates the elements
|
|
|
26 // and returns the two channels: the first one returns
|
|
|
27 // the generated elements and the last one returns
|
|
|
28 // an error when it occurs.
|
|
|
29 func parse(lines []string) (<-chan element, <-chan error) {
|
|
|
30 elemc := make(chan element, len(lines))
|
|
|
31 errc := make(chan error)
|
|
|
32
|
|
|
33 go func() {
|
|
|
34 i := 0
|
|
|
35 l := len(lines)
|
|
|
36
|
|
|
37 for i < l {
|
|
|
38 // Fetch a line.
|
|
|
39 ln := newLine(i+1, lines[i])
|
|
|
40 i++
|
|
|
41
|
|
|
42 // Ignore the empty line.
|
|
|
43 if ln.isEmpty() {
|
|
|
44 continue
|
|
|
45 }
|
|
|
46
|
|
|
47 if ln.isTopIndent() {
|
|
|
48 elem, err := newElement(ln, nil)
|
|
|
49
|
|
|
50 if err != nil {
|
|
|
51 errc <- err
|
|
|
52 return
|
|
|
53 }
|
|
|
54
|
|
|
55 if err := appendChildren(elem, lines, &i, l); err != nil {
|
|
|
56 errc <- err
|
|
|
57 return
|
|
|
58 }
|
|
|
59
|
|
|
60 elemc <- elem
|
|
|
61 }
|
|
|
62 }
|
|
|
63
|
|
|
64 close(elemc)
|
|
|
65 }()
|
|
|
66
|
|
|
67 return elemc, errc
|
|
|
68 }
|
|
|
69
|
|
|
70 // appendChildren parses the lines and appends the child elements
|
|
|
71 // to the parent element.
|
|
|
72 func appendChildren(parent element, lines []string, i *int, l int) error {
|
|
|
73 for *i < l {
|
|
|
74 // Fetch a line.
|
|
|
75 ln := newLine(*i+1, lines[*i])
|
|
|
76
|
|
|
77 // Ignore the empty line.
|
|
|
78 if ln.isEmpty() {
|
|
|
79 *i++
|
|
|
80 return nil
|
|
|
81 }
|
|
|
82
|
|
|
83 ok, err := ln.childOf(parent)
|
|
|
84
|
|
|
85 if err != nil {
|
|
|
86 return err
|
|
|
87 }
|
|
|
88
|
|
|
89 if !ok {
|
|
|
90 return nil
|
|
|
91 }
|
|
|
92
|
|
|
93 child, err := newElement(ln, parent)
|
|
|
94
|
|
|
95 if err != nil {
|
|
|
96 return err
|
|
|
97 }
|
|
|
98
|
|
|
99 parent.AppendChild(child)
|
|
|
100
|
|
|
101 *i++
|
|
|
102
|
|
|
103 if err := appendChildren(child, lines, i, l); err != nil {
|
|
|
104 return err
|
|
|
105 }
|
|
|
106 }
|
|
|
107
|
|
|
108 return nil
|
|
|
109 }
|
|
|
110
|
|
|
111 // formatLF replaces the line feed codes with LF and
|
|
|
112 // returns the result string.
|
|
|
113 func formatLF(s string) string {
|
|
|
114 return strings.Replace(strings.Replace(s, crlf, lf, -1), cr, lf, -1)
|
|
|
115 }
|
