Class: SpinelKit::Url

Inherits:
Object
  • Object
show all
Defined in:
lib/spinel_kit/url.rb

Class Method Summary collapse

Class Method Details

.escape(s) ⇒ Object

Percent-encode everything outside the RFC 3986 unreserved set (ALPHA / DIGIT / -._~); the rest becomes %XX with UPPERCASE hex. (Space -> %20, not + -- this is the URI-component, not form, encoder.)

Byte-oriented: under Spinel String#[] indexes BYTES, so a multi-byte UTF-8 char is encoded byte-by-byte (correct %XX of each byte). Under CRuby, pass a binary string for the same behaviour (else [] splits on chars).



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# File 'lib/spinel_kit/url.rb', line 50

def self.escape(s)
  out = ""
  i = 0
  while i < s.length
    c = s[i]
    if (c >= "a" && c <= "z") || (c >= "A" && c <= "Z") ||
       (c >= "0" && c <= "9") || c == "-" || c == "." ||
       c == "_" || c == "~"
      out = out + c
    else
      b = c.getbyte(0)
      out = out + "%" + Hex.nibble_char(b / 16) + Hex.nibble_char(b % 16)
    end
    i += 1
  end
  out
end

.find_idx(s, needle, start) ⇒ Object

First index of needle in s at/after start, or -1. Internal (Spinel-safe substring search; see the module comment).



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# File 'lib/spinel_kit/url.rb', line 153

def self.find_idx(s, needle, start)
  nlen = needle.length
  slen = s.length
  pos = start
  while pos <= slen - nlen
    if s[pos, nlen] == needle
      return pos
    end
    pos += 1
  end
  -1
end

.parse_query(s) ⇒ Object

"a=1&b=2&c" -> "a"=>"1","b"=>"2","c"=>"". Keys + values are form-decoded (unescape).



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# File 'lib/spinel_kit/url.rb', line 70

def self.parse_query(s)
  h = {"" => ""}
  h.delete("")
  if s.length == 0
    return h
  end
  pairs = s.split("&")
  pairs.each do |pair|
    if pair.length > 0
      eq = Url.find_idx(pair, "=", 0)
      if eq < 0
        h[Url.unescape(pair)] = ""
      else
        k = pair[0, eq]
        v = pair[eq + 1, pair.length - eq - 1]
        h[Url.unescape(k)] = Url.unescape(v)
      end
    end
  end
  h
end

.split_url(u) ⇒ Object

Split http(s)://host[:port]/path?query into a str=>str hash keyed scheme / host / port / path / query. Without a scheme the input is treated as a path (host stays empty). Default ports follow the scheme (80 / 443); query is the raw substring after ? (not decoded).

One body on purpose: Spinel widens a Hash-typed value when a helper mutates it and the caller keeps reading, so out stays StrStrHash only if nothing factors the mutation out (find_idx returns an int, no mutate).



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# File 'lib/spinel_kit/url.rb', line 100

def self.split_url(u)
  out = {"" => ""}
  out.delete("")
  out["scheme"] = ""
  out["host"]   = ""
  out["port"]   = ""
  out["path"]   = "/"
  out["query"]  = ""

  rest = u
  if rest.length >= 7 && rest[0, 7] == "http://"
    out["scheme"] = "http"
    out["port"]   = "80"
    rest = rest[7, rest.length - 7]
  elsif rest.length >= 8 && rest[0, 8] == "https://"
    out["scheme"] = "https"
    out["port"]   = "443"
    rest = rest[8, rest.length - 8]
  end

  if out["scheme"].length > 0
    slash = Url.find_idx(rest, "/", 0)
    hostport = rest
    tail     = "/"
    if slash >= 0
      hostport = rest[0, slash]
      tail     = rest[slash, rest.length - slash]
    end
    colon = Url.find_idx(hostport, ":", 0)
    if colon >= 0
      out["host"] = hostport[0, colon]
      out["port"] = hostport[colon + 1, hostport.length - colon - 1]
    else
      out["host"] = hostport
    end
    rest = tail
  end

  qi = Url.find_idx(rest, "?", 0)
  if qi >= 0
    out["path"]  = rest[0, qi]
    out["query"] = rest[qi + 1, rest.length - qi - 1]
  else
    out["path"] = rest
  end
  if out["path"].length == 0
    out["path"] = "/"
  end
  out
end

.unescape(s) ⇒ Object

"%41+b" -> "A b" (form-decode: + is space, %XX is a byte).



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# File 'lib/spinel_kit/url.rb', line 16

def self.unescape(s)
  out = ""
  i = 0
  n = s.length
  while i < n
    c = s[i]
    if c == "+"
      out = out + " "
      i += 1
    elsif c == "%" && i + 2 < n
      hi = Hex.nibble(s[i + 1])
      lo = Hex.nibble(s[i + 2])
      if hi >= 0 && lo >= 0
        out = out + ((hi * 16 + lo).chr)
        i += 3
      else
        out = out + c
        i += 1
      end
    else
      out = out + c
      i += 1
    end
  end
  out
end