1 files changed, 46 insertions, 0 deletions
diff --git a/lib/exclusion_rule.coffee b/lib/exclusion_rule.coffee
new file mode 100644
index 00000000..0942e7cf
--- /dev/null
+++ b/lib/exclusion_rule.coffee
@@ -0,0 +1,46 @@
+root = exports ? window
+
+# Operations to build the DOM on the options page for a single exclusion rule.
+
+root.ExclusionRule =
+
+  # Build a DOM table row (a "tr") for this rule.
+  buildRuleElement: (rule,enableSaveButton) ->
+    pattern = @buildInput(enableSaveButton,rule.pattern,"URL pattern","pattern")
+    passKeys = @buildInput(enableSaveButton,rule.passKeys,"Excluded keys","passKeys")
+    row = document.createElement("tr")
+    row.className = "exclusionRow"
+    remove = document.createElement("input")
+    remove.type = "button"
+    remove.value = "\u2716" # A cross.
+    remove.className = "exclusionRemoveButton"
+    remove.addEventListener "click", ->
+      row.parentNode.removeChild(row)
+      enableSaveButton()
+    row.appendChild(pattern)
+    row.appendChild(passKeys)
+    row.appendChild(remove)
+    # NOTE: Since the order of exclusions matters, it would be nice to have "Move Up" and "Move Down" buttons,
+    # too.  But this option is pretty cluttered already.
+    row
+
+  # Build DOM (a "td" containing an "input") for a single input element.
+  buildInput: (enableSaveButton,value,placeholder,cls) ->
+    input = document.createElement("input")
+    input.setAttribute("placeholder",placeholder)
+    input.type = "text"
+    input.value = value
+    input.className = cls
+    input.addEventListener "keyup", enableSaveButton, false
+    input.addEventListener "change", enableSaveButton, false
+    container = document.createElement("td")
+    container.appendChild(input)
+    container
+
+  # Build a new exclusion rule from the given element.  This is the reverse of the two methods above.
+  extractRule: (element) ->
+    patternElement = element.firstChild
+    passKeysElement = patternElement.nextSibling
+    pattern = patternElement.firstChild.value.trim()
+    passKeys = passKeysElement.firstChild.value.trim()
+    if pattern then { pattern: pattern, passKeys: passKeys } else null