Use vendored modules

Signed-off-by: Izuru Yakumo <yakumo.izuru@chaotic.ninja>

git-svn-id: file:///srv/svn/repo/aya/trunk@67 cec141ff-132a-4243-88a5-ce187bd62f94

vendor/github.com/yosssi/gcss/variable.go

@@ -0,0 +1,62 @@
+package gcss
+
+import (
+	"fmt"
+	"io"
+	"strings"
+)
+
+// variable represents a GCSS variable.
+type variable struct {
+	elementBase
+	name  string
+	value string
+}
+
+// WriteTo writes the variable to the writer.
+func (v *variable) WriteTo(w io.Writer) (int64, error) {
+	n, err := w.Write([]byte(v.value))
+
+	return int64(n), err
+}
+
+// variableNV extracts a variable name and value
+// from the line.
+func variableNV(ln *line) (string, string, error) {
+	s := strings.TrimSpace(ln.s)
+
+	if !strings.HasPrefix(s, dollarMark) {
+		return "", "", fmt.Errorf("variable must start with %q [line: %d]", dollarMark, ln.no)
+	}
+
+	nv := strings.SplitN(s, space, 2)
+
+	if len(nv) < 2 {
+		return "", "", fmt.Errorf("variable's name and value should be divided by a space [line: %d]", ln.no)
+	}
+
+	if !strings.HasSuffix(nv[0], colon) {
+		return "", "", fmt.Errorf("variable's name should end with a colon [line: %d]", ln.no)
+	}
+
+	return strings.TrimSuffix(strings.TrimPrefix(nv[0], dollarMark), colon), nv[1], nil
+}
+
+// newVariable creates and returns a variable.
+func newVariable(ln *line, parent element) (*variable, error) {
+	name, value, err := variableNV(ln)
+
+	if err != nil {
+		return nil, err
+	}
+
+	if strings.HasSuffix(value, semicolon) {
+		return nil, fmt.Errorf("variable must not end with %q", semicolon)
+	}
+
+	return &variable{
+		elementBase: newElementBase(ln, parent),
+		name:        name,
+		value:       value,
+	}, nil
+}