Add support for fragment in parse_url and build_url

NEWS

@@ -29,6 +29,9 @@ httr 0.2.99
   httpd server). This makes the dance work in Rstudio, and also seems a little
   faster. (#32, thanks to @jdeboer)
 
+* Add support for `fragment` in url building/parsing. Contributed by
+  Craig Citro. (#70)
+
 httr 0.2
 -----------
 

R/url.r

@@ -14,6 +14,7 @@
 #'  \item port
 #'  \item path
 #'  \item params
+#'  \item fragment
 #'  \item query, a list
 #'  \item username
 #'  \item password
@@ -78,8 +79,9 @@ parse_url <- function(url) {
   params <- pull_off(";(.*)$")
 
   structure(list(
-    scheme = scheme, hostname = hostname, port = port, path = url,
-    query = query, params = params, username = username, password = password),
+      scheme = scheme, hostname = hostname, port = port, path = url,
+      query = query, params = params, fragment = fragment,
+      username = username, password = password),
     class = "url")
 }
 
@@ -126,18 +128,15 @@ build_url <- function(url) {
     query <- str_c("?", query)
   }
 
-  if (!is.null(url$username)) {
-    if (!is.null(url$password)) {
-      password <- str_c(":", url$password)
-    } else {
-      password <- NULL
-    }
-    login <- str_c(url$username, password, "@")
-  } else {
-    login <- NULL
+  if (is.null(url$username) && !is.null(url$password)) {
+    stop("Cannot set password without username")
   }
 
-  str_c(scheme, "://", login, hostname, port, "/", path, params, query)
+  str_c(scheme, "://",
+        url$username, if (!is.null(url$password)) ":", url$password,
+        if (!is.null(url$username)) "@",
+        hostname, port, "/", path, params, query,
+        if (!is.null(url$fragment)) "#", url$fragment)
 }
 
 #' Modify a url.
@@ -147,14 +146,17 @@ build_url <- function(url) {
 #'
 #' @export
 #' @param url the url to modify
-#' @param scheme,hostname,port,path,query,params,username,password
+#' @param scheme,hostname,port,path,query,params,fragment,username,password
 #'   components of the url to change
-modify_url <- function(url, scheme = NULL, hostname = NULL, port = NULL, path = NULL, query = NULL, params = NULL, username = NULL, password = NULL) {
+modify_url <- function(url, scheme = NULL, hostname = NULL, port = NULL,
+                       path = NULL, query = NULL, params = NULL, fragment = NULL,
+                       username = NULL, password = NULL) {
 
   old <- parse_url(url)
   new <- compact(list(
     scheme = scheme, hostname = hostname, port = port, path = path,
-    query = query, params = params, username = username, password = password))
+    query = query, params = params, fragment = fragment,
+    username = username, password = password))
 
   build_url(modifyList(old, new))
 }

inst/tests/test-url.r

@@ -8,6 +8,7 @@ test_that("parse_url works as expected", {
     "http://google.com/path?a=1&b=2",
     "http://google.com/path;param?a=1&b=2",
     "http://google.com:80/path;param?a=1&b=2",
+    "http://google.com:80/path;param?a=1&b=2#frag",
     "http://user@google.com:80/path;param?a=1&b=2",
     "http://user:pass@google.com:80/path;param?a=1&b=2",
     "svn+ssh://my.svn.server/repo/trunk"
@@ -31,4 +32,12 @@ test_that("query strings escaped and unescaped correctly", {
   parsed <- parse_url(url)
   expect_equal(parsed$query, list("x y" = "a b"))
   expect_equal(build_url(parsed), url)
-})
+})
+
+test_that("password and no username is an error", {
+  url <- "http://www.example.com/"
+  parsed <- parse_url(url)
+  expect_equal(build_url(parsed), url)
+  parsed$password <- "secret"
+  expect_error(build_url(parsed), "password without username")
+})

man/modify_url.Rd

@@ -3,13 +3,13 @@
 \title{Modify a url.}
 \usage{
 modify_url(url, scheme = NULL, hostname = NULL, port = NULL,
-  path = NULL, query = NULL, params = NULL, username = NULL,
-  password = NULL)
+  path = NULL, query = NULL, params = NULL, fragment = NULL,
+  username = NULL, password = NULL)
 }
 \arguments{
   \item{url}{the url to modify}
 
-  \item{scheme,hostname,port,path,query,params,username,password}{components
+  \item{scheme,hostname,port,path,query,params,fragment,username,password}{components
   of the url to change}
 }
 \description{