52 lines
1.7 KiB
C#
52 lines
1.7 KiB
C#
namespace System.Web.Mvc {
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using System;
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using System.Collections.Generic;
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using System.Linq;
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internal static class ValueProviderUtil {
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// Given "foo.bar[baz].quux", this method will return:
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// - "foo.bar[baz].quux"
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// - "foo.bar[baz]"
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// - "foo.bar"
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// - "foo"
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public static IEnumerable<string> GetPrefixes(string key) {
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yield return key;
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for (int i = key.Length - 1; i >= 0; i--) {
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switch (key[i]) {
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case '.':
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case '[':
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yield return key.Substring(0, i);
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break;
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}
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}
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}
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public static bool CollectionContainsPrefix(IEnumerable<string> collection, string prefix) {
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foreach (string key in collection) {
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if (key != null) {
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if (prefix.Length == 0) {
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return true; // shortcut - non-null key matches empty prefix
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}
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if (key.StartsWith(prefix, StringComparison.OrdinalIgnoreCase)) {
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if (key.Length == prefix.Length) {
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return true; // exact match
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}
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else {
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switch (key[prefix.Length]) {
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case '.': // known separator characters
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case '[':
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return true;
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}
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}
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}
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}
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}
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return false; // nothing found
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}
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}
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}
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