diff options
Diffstat (limited to 'lib.go')
| -rw-r--r-- | lib.go | 46 |
1 files changed, 46 insertions, 0 deletions
@@ -18,6 +18,7 @@ import ( "encoding/xml" "fmt" "io" + "regexp" "strconv" "strings" ) @@ -454,6 +455,51 @@ func isNumeric(s string) (bool, int) { return true, p } +// bstrUnmarshal parses the binary basic string, this will trim escaped string +// literal which not permitted in an XML 1.0 document. The basic string +// variant type can store any valid Unicode character. Unicode characters +// that cannot be directly represented in XML as defined by the XML 1.0 +// specification, shall be escaped using the Unicode numerical character +// representation escape character format _xHHHH_, where H represents a +// hexadecimal character in the character's value. For example: The Unicode +// character 8 is not permitted in an XML 1.0 document, so it shall be +// escaped as _x0008_. To store the literal form of an escape sequence, the +// initial underscore shall itself be escaped (i.e. stored as _x005F_). For +// example: The string literal _x0008_ would be stored as _x005F_x0008_. +func bstrUnmarshal(s string) (result string) { + m := regexp.MustCompile(`_x[a-zA-Z0-9]{4}_`) + escapeExp := regexp.MustCompile(`x[a-zA-Z0-9]{4}_`) + matches := m.FindAllStringSubmatchIndex(s, -1) + var cursor int + for _, match := range matches { + result += s[cursor:match[0]] + if s[match[0]:match[1]] == "_x005F_" { + if len(s) > match[1]+6 && !escapeExp.MatchString(s[match[1]:match[1]+6]) { + result += s[match[0]:match[1]] + cursor = match[1] + continue + } + if len(s) > match[1]+5 && s[match[1]:match[1]+5] == "x005F" { + result += "_" + cursor = match[1] + continue + } + if escapeExp.MatchString(s[match[0]:match[1]]) { + result += "_" + cursor = match[1] + continue + } + } + if escapeExp.MatchString(s[match[0]:match[1]]) { + cursor = match[1] + } + } + if cursor < len(s) { + result += s[cursor:] + } + return result +} + // Stack defined an abstract data type that serves as a collection of elements. type Stack struct { list *list.List |