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