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Make underscores and dashes equal.

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This commit is contained in:
Natalie Weizenbaum 2016-08-19 15:54:57 -07:00
parent 113b4787ed
commit 77dd5c1e84
2 changed files with 41 additions and 4 deletions
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5
lib/src/environment.dart
View File

@ -3,12 +3,13 @@
// https://opensource.org/licenses/MIT.
import 'value.dart';
import 'utils.dart';
class Environment {
/// Base is global scope.
final _variables = [<String, Value>{}];
final _variables = [separatorIndependentMap/*<Value>*/()];
final _variableIndices = <String, int>{};
final _variableIndices = separatorIndependentMap/*<int>*/();
Value getVariable(String name) =>
_variables[_variableIndices[name] ?? 0][name];

40
lib/src/utils.dart
View File

@ -58,13 +58,49 @@ String unvendor(String name) {
return name;
}
bool equalsIgnoreSeparator(String string1, String string2) {
print("eis: $string1 $string2");
if (identical(string1, string2)) return true;
if (string1 == null || string2 == null) return false;
if (string1.length != string2.length) return false;
for (var i = 0; i < string1.length; i++) {
var codeUnit1 = string1.codeUnitAt(i);
var codeUnit2 = string2.codeUnitAt(i);
if (codeUnit1 == codeUnit2) continue;
if (codeUnit1 == $dash) {
if (codeUnit2 != $underscore) return false;
} else if (codeUnit1 == $underscore) {
if (codeUnit2 != $dash) return false;
} else {
return false;
}
}
return true;
}
int hashCodeIgnoreSeparator(String string) {
var hash = 4603;
for (var i = 0; i < string.length; i++) {
var codeUnit = string.codeUnitAt(i);
if (codeUnit == $underscore) codeUnit = $dash;
hash &= 0x3FFFFFF;
hash *= 33;
hash ^= codeUnit;
}
return hash;
}
bool equalsIgnoreCase(String string1, String string2) {
if (string1 == null) return string2 == null;
if (string2 == null) return false;
if (identical(string1, string2)) return true;
if (string1 == null || string2 == null) return false;
if (string1.length != string2.length) return false;
return string1.toUpperCase() == string2.toUpperCase();
}
Map/*<V>*/ separatorIndependentMap/*<V>*/() =>
new LinkedHashMap(
equals: equalsIgnoreSeparator, hashCode: hashCodeIgnoreSeparator);
bool almostEquals(num number1, num number2) =>
(number1 - number2).abs() < _epsilon;