From aace82a89073d3547856742e9f3a403b1f3fba03 Mon Sep 17 00:00:00 2001
From: j-james
Date: Fri, 1 Jul 2022 22:58:19 -0700
Subject: Move URI handling and rename node.nested to node.children
---
src/formats/html.nim | 15 +++--
src/formats/uri.nim | 182 +++++++++++++++++++++++++++++++++++++++++++++++++++
2 files changed, 190 insertions(+), 7 deletions(-)
create mode 100644 src/formats/uri.nim
(limited to 'src/formats')
diff --git a/src/formats/html.nim b/src/formats/html.nim
index 8724295..8299a51 100644
--- a/src/formats/html.nim
+++ b/src/formats/html.nim
@@ -13,16 +13,17 @@ type NodeKind* = enum
# Clever node implementation from callsamu and XmlNodeObj
# Note that Text nodes are _only_ text.
# ex. this test node is three nodes: "this ", " node", and the tag
-type Node* {.acyclic.} = object
+type Node* = ref object
+ # parent*: Node # Unfortunately, we will have to deal with cycles.
case kind*: NodeKind:
of Text:
text*: string
of Element:
tag*: string
attributes*: Table[string, string] # change
- nested*: seq[Node]
+ children*: seq[Node]
-# Note that even plain text is valid HTML.
+# Note that even plain text is valid HTML, in this implementation.
type Html* = seq[Node]
type ParserState = enum
@@ -54,7 +55,7 @@ func conclude(buffer: string, unfinished: var seq[Node], result: var Html) =
let split: seq[string] = buffer.strip(false, true, {'/'}).strip().split(' ')
let tag = split[0].toLower
let attributes = split[1..^1].attributes
- let node = Node(kind: Element, tag: tag, attributes: attributes, nested: @[])
+ let node = Node(kind: Element, tag: tag, attributes: attributes, children: @[])
# If we're in a self-closing tag:
if tag in self_closing_tags:
@@ -64,7 +65,7 @@ func conclude(buffer: string, unfinished: var seq[Node], result: var Html) =
if tag.len > 0 and tag[0] == '/' or tag in self_closing_tags:
# Add the element to the parent node
if unfinished.len > 1:
- unfinished[^2].nested.add(unfinished.pop)
+ unfinished[^2].children.add(unfinished.pop)
# Or, if there is no parent node, add the element to the result
else:
result.add(unfinished.pop)
@@ -75,7 +76,7 @@ func conclude(buffer: string, unfinished: var seq[Node], result: var Html) =
func finish(unfinished: var seq[Node], result: var seq[Node]) =
while unfinished.len > 1:
- unfinished[^2].nested.add(unfinished.pop)
+ unfinished[^2].children.add(unfinished.pop)
if unfinished.len == 1:
result.add(unfinished.pop)
@@ -90,7 +91,7 @@ func parseHTML*(html: string): Html =
if not in_tag and c == '<':
# Add the collected text content to the parent node, if there is text
if buffer.strip() != "":
- unfinished[^1].nested.add(Node(kind: Text, text: buffer))
+ unfinished[^1].children.add(Node(kind: Text, text: buffer))
in_tag = true
buffer = ""
# End of a tag
diff --git a/src/formats/uri.nim b/src/formats/uri.nim
new file mode 100644
index 0000000..e2fc7f3
--- /dev/null
+++ b/src/formats/uri.nim
@@ -0,0 +1,182 @@
+import std/strutils
+
+# https://datatracker.ietf.org/doc/html/rfc3986
+type Url* = object
+ scheme*: string # :
+ authority*: string # //
+ userinfo*: string # @
+ host*: string # .
+ port*: int # :
+ path*: string # /
+ query*: string # ?
+ fragment*: string # #
+
+const
+ gendelims* = {':', '/', '?', '#', '[', ']', '@'}
+ subdelims* = {'!', '$', '&', '\'', '(', ')', '*', '+', ',', ';', '='}
+ reserved* = gendelims + subdelims
+ unreserved* = {'a'..'z', 'A'..'Z', '0'..'9', '-', '.', '_', '~'}
+ otherchars* = {'"', '%', '<', '>', '\\', '^', '`', '{', '|', '}', } # plus, whitespace and control characters
+
+# This might be spec-compliant.
+func parseURL*(url: string): Url =
+ # Each URI must begin with a scheme name.
+ # Scheme names consist of a sequence of characters beginning with a letter,
+ # and followed by any combination of letters, digits, plus, period, or hyphen.
+ var split = url.split(':', maxsplit=1)
+ if split.len == 2:
+ # Although schemes are case-insensitive, an implementation should produce
+ # lowercase scheme names for consistency.
+ result.scheme = split[0].toLower
+ assert allCharsInSet(result.scheme, {'a'..'z', '0'..'9', '+', '-', '.'})
+
+ # The authority component is preceded by a double slash, and is terminated by
+ # the next slash, question mark, or pound sign, or by the end of the URI.
+ if split[1][0..1] == "//":
+ result.authority = split[1][2..^1].split({'/', '?', '#'}, maxsplit=1)[0]
+ split[1] = split[1][result.authority.len + 2 ..< split[1].len]
+
+ # A fragment identifier component is indicate by the presense of a pound sign
+ # character, and terminated by the end of the URI.
+ split = split[1].split('#', maxsplit=1)
+ if split.len == 2:
+ result.fragment = split[1]
+
+ # The query component is indicated by the first question mark character,
+ # and terminated by a pound sign or the end of the URI.
+ split = split[0].split('?', maxsplit=1)
+ if split.len == 2:
+ result.query = split[1]
+
+ # Todo: path parsing is actually more complex. this is cheating.
+ if split[0] != "":
+ result.path = "/" & split[0].strip(leading=true, trailing=false, {'/'})
+
+ if result.authority != "":
+ # The port subcomponent, if present, is designated by an optional port number
+ # in decimal following the host and deliminated from it by a single colon.
+ split = result.authority.rsplit({':'}, maxsplit=1)
+ if split.len == 2:
+ # If we accidentally parsed an IPv6 address: reconstruct
+ if ']' in split[1]:
+ split[0] = split[0] & ":" & split[1]
+ split[1] = ""
+ else:
+ result.port = split[1].parseInt
+ assert allCharsInSet(split[1], {'0'..'9'})
+
+ # The userinfo subcomponent, if present, is followed by an at-sign
+ # that delimits it from the host.
+ split = split[0].split('@', maxsplit=1)
+ if split.len == 2:
+ result.userinfo = split[0]
+ # Todo: parse hosts
+ result.host = split[1]
+ else:
+ result.host = split[0]
+ # Todo: is this assert right?
+ assert allCharsInSet(result.host, unreserved + subdelims + {':', '[', ']'})
+ else:
+ raise newException(RangeDefect, "URL does not begin with a scheme")
+
+ #[ Todo: advanced resolution and relative references
+ # A relative reference takes advantage of the hierarchical syntax to express
+ # a reference relative to the name space of another hierarchical URI.
+ if url.len == 0:
+ raise newException(RangeDefect, "URL is an empty string")
+ # Relative path reference
+ elif url[0] == '.':
+ return
+ # Network path reference
+ elif url.len > 1 and url[0..1] == "//":
+ return
+ # Absolute path reference
+ elif url[0] == '/':
+ discard url.split('/', maxsplit=1)
+ ]#
+
+#[
+# This is compact. But it's probably not spec-compliant.
+func parseURL*(url: string): Url =
+ # https://google.com/path?query#fragment
+ # https, //google.com/path?query#fragment
+ var split: seq[string] = url.split(':', maxsplit=1)
+ if split.len == 2:
+ result.scheme = split[0]
+
+ # //google.com/path?query, fragment
+ split = split[1].rsplit('#', maxsplit=1)
+ if split.len == 2:
+ result.fragment = split[1]
+
+ # //google.com/path, query
+ # //google.com/, query
+ split = split[0].rsplit('?', maxsplit=1)
+ if split.len == 2:
+ result.query = split[1]
+
+ # //google.com/path
+ # //google.com
+ # somethingelse
+ if split[0][0..1] == "//":
+ split = split[0].strip(leading=true, trailing=false, {'/'}).split('/', maxsplit=1)
+ result.authority = split[0]
+ if split.len == 2:
+ result.path = split[1]
+ else:
+ # Note: This is a weird state.
+ result.path = split[0].strip(leading=true, trailing=true, {'/'})
+ debugEcho split[0]
+
+ # userinfo@host:port
+ # userinfo, host:port
+ var remainder = result.authority
+ split = result.authority.split('@', maxsplit=1)
+ if split.len == 2:
+ result.userinfo = split[0]
+ remainder = split[1]
+
+ # host, port
+ split = remainder.rsplit(':', maxsplit=1)
+ remainder = split[0]
+ if split.len == 2:
+ result.port = split[1].parseInt
+
+ result.host = split[0]
+
+ else:
+ raise newException(OSError, "URL does not contain a colon")
+]#
+
+# assert parseURL("google.com") == Url(authority: "google.com", host: "google.com")
+# assert parseURL("http://") == Url(scheme: "http")
+assert parseURL("https://google.com") == Url(scheme: "https", authority: "google.com", host: "google.com")
+assert parseURL("https://google.com/path//path") == Url(scheme: "https", authority: "google.com", host: "google.com", path: "/path//path")
+assert parseURL("https://google.com/path?query") == Url(scheme: "https", authority: "google.com", host: "google.com", path: "/path", query: "query")
+assert parseURL("https://google.com/path/?query") == Url(scheme: "https", authority: "google.com", host: "google.com", path: "/path/", query: "query")
+assert parseURL("https://google.com?query") == Url(scheme: "https", authority: "google.com", host: "google.com", query: "query")
+assert parseURL("https://google.com/path#fragment") == Url(scheme: "https", authority: "google.com", host: "google.com", path: "/path", fragment: "fragment")
+assert parseURL("https://google.com/path#fragment?query") == Url(scheme: "https", authority: "google.com", host: "google.com", path: "/path", fragment: "fragment?query")
+assert parseURL("https://192.168.0.1/path#fragment?query") == Url(scheme: "https", authority: "192.168.0.1", host: "192.168.0.1", path: "/path", fragment: "fragment?query")
+assert parseURL("https://12:12:12:12/path#fragment?query") == Url(scheme: "https", authority: "12:12:12:12", host: "12:12:12", port: 12, path: "/path", fragment: "fragment?query")
+assert parseURL("https://[12:213:213:fr:12]:1200/path#fragment?query") == Url(scheme: "https", authority: "[12:213:213:fr:12]:1200", host: "[12:213:213:fr:12]", port: 1200, path: "/path", fragment: "fragment?query")
+assert parseURL("https://userinfo@host.com:8080/path#fragment?query") == Url(scheme: "https", authority: "userinfo@host.com:8080", userinfo: "userinfo", host: "host.com", port: 8080, path: "/path", fragment: "fragment?query")
+
+assert parseURL("ftp://ftp.is.co.za/rfc/rfc1808.txt") == Url(scheme: "ftp", authority: "ftp.is.co.za", host: "ftp.is.co.za", path: "/rfc/rfc1808.txt")
+assert parseURL("http://www.ietf.org/rfc/rfc2396.txt") == Url(scheme: "http", authority: "www.ietf.org", host: "www.ietf.org", path: "/rfc/rfc2396.txt")
+assert parseURL("ldap://[2001:db8::7]/c=GB?objectClass?one") == Url(scheme: "ldap", authority: "[2001:db8::7]", host: "[2001:db8::7]", path: "/c=GB", query: "objectClass?one")
+
+# Todo: Ugh, are these right?
+assert parseURL("mailto:John.Doe@example.com") == Url(scheme: "mailto", path: "/John.Doe@example.com") # ugh is this right
+assert parseURL("news:comp.infosystems.www.servers.unix") == Url(scheme: "news", path: "/comp.infosystems.www.servers.unix")
+assert parseURL("tel:+1-816-555-1212") == Url(scheme: "tel", path: "/+1-816-555-1212")
+assert parseURL("telnet://192.0.2.16:80/") == Url(scheme: "telnet", authority: "192.0.2.16:80", host: "192.0.2.16", port: 80, path: "/")
+assert parseURL("urn:oasis:names:specification:docbook:dtd:xml:4.1.2") == Url(scheme: "urn", path: "/oasis:names:specification:docbook:dtd:xml:4.1.2")
+
+func encodeURL(url: string): string =
+ for c in url:
+ if c in unreserved:
+ result &= c
+ # Note: `+`?
+ else:
+ result &= "%" & toHex(ord(c), 2)
--
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