Update vendor (#1265)

vendor/github.com/wiggin77/cfg/ini/parser.go

@@ -0,0 +1,142 @@
+package ini
+
+import (
+	"fmt"
+	"strings"
+
+	"github.com/wiggin77/merror"
+)
+
+// LF is linefeed
+const LF byte = 0x0A
+
+// CR is carriage return
+const CR byte = 0x0D
+
+// getSections parses an INI formatted string, or string containing just name/value pairs,
+// returns map of `Section`'s.
+//
+// Any name/value pairs appearing before a section name are added to the section named
+// with an empty string ("").  Also true for Linux-style config files where all props
+// are outside a named section.
+//
+// Any errors encountered are aggregated and returned, along with the partially parsed
+// sections.
+func getSections(str string) (map[string]*Section, error) {
+	merr := merror.New()
+	mapSections := make(map[string]*Section)
+	lines := buildLineArray(str)
+	section := newSection("")
+
+	for _, line := range lines {
+		name, ok := parseSection(line)
+		if ok {
+			// A section name encountered. Stop processing the current one.
+			// Don't add the current section to the map if the section name is blank
+			// and the prop map is empty.
+			nameCurr := section.GetName()
+			if nameCurr != "" || section.hasKeys() {
+				mapSections[nameCurr] = section
+			}
+			// Start processing a new section.
+			section = newSection(name)
+		} else {
+			// Parse the property and add to the current section, or ignore if comment.
+			if k, v, comment, err := parseProp(line); !comment && err == nil {
+				section.setProp(k, v)
+			} else if err != nil {
+				merr.Append(err) // aggregate errors
+			}
+		}
+
+	}
+	// If the current section is not empty, add it.
+	if section.hasKeys() {
+		mapSections[section.GetName()] = section
+	}
+	return mapSections, merr.ErrorOrNil()
+}
+
+// buildLineArray parses the given string buffer and creates a list of strings,
+// one for each line in the string buffer.
+//
+// A line is considered to be terminated by any one of a line feed ('\n'),
+// a carriage return ('\r'), or a carriage return followed immediately by a
+// linefeed.
+//
+// Lines prefixed with ';' or '#' are considered comments and skipped.
+func buildLineArray(str string) []string {
+	arr := make([]string, 0, 10)
+	str = str + "\n"
+
+	iLen := len(str)
+	iPos, iBegin := 0, 0
+	var ch byte
+
+	for iPos < iLen {
+		ch = str[iPos]
+		if ch == LF || ch == CR {
+			sub := str[iBegin:iPos]
+			sub = strings.TrimSpace(sub)
+			if sub != "" && !strings.HasPrefix(sub, ";") && !strings.HasPrefix(sub, "#") {
+				arr = append(arr, sub)
+			}
+			iPos++
+			if ch == CR && iPos < iLen && str[iPos] == LF {
+				iPos++
+			}
+			iBegin = iPos
+		} else {
+			iPos++
+		}
+	}
+	return arr
+}
+
+// parseSection parses the specified string for a section name enclosed in square brackets.
+// Returns the section name found, or `ok=false` if `str` is not a section header.
+func parseSection(str string) (name string, ok bool) {
+	str = strings.TrimSpace(str)
+	if !strings.HasPrefix(str, "[") {
+		return "", false
+	}
+	iCloser := strings.Index(str, "]")
+	if iCloser == -1 {
+		return "", false
+	}
+	return strings.TrimSpace(str[1:iCloser]), true
+}
+
+// parseProp parses the specified string and extracts a key/value pair.
+//
+// If the string is a comment (prefixed with ';' or '#') then `comment=true`
+// and key will be empty.
+func parseProp(str string) (key string, val string, comment bool, err error) {
+	iLen := len(str)
+	iEqPos := strings.Index(str, "=")
+	if iEqPos == -1 {
+		return "", "", false, fmt.Errorf("not a key/value pair:'%s'", str)
+	}
+
+	key = str[0:iEqPos]
+	key = strings.TrimSpace(key)
+	if iEqPos+1 < iLen {
+		val = str[iEqPos+1:]
+		val = strings.TrimSpace(val)
+	}
+
+	// Check that the key has at least 1 char.
+	if key == "" {
+		return "", "", false, fmt.Errorf("key is empty for '%s'", str)
+	}
+
+	// Check if this line is a comment that just happens
+	// to have an equals sign in it. Not an error, but not a
+	// useable line either.
+	if strings.HasPrefix(key, ";") || strings.HasPrefix(key, "#") {
+		key = ""
+		val = ""
+		comment = true
+	}
+	return key, val, comment, err
+}