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Refactoring: extracted 'getDataFlowInfosForEntryCondition'

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Removed duplicated code
This commit is contained in:
Svetlana Isakova
2014-06-06 10:46:40 +04:00
parent 1eaf79bd1e
commit cb788579ba
1 changed files with 35 additions and 32 deletions
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compiler/frontend/src/org/jetbrains/jet/lang/types/expressions/PatternMatchingTypingVisitor.java
+35 -32
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@@ -99,46 +99,22 @@ public class PatternMatchingTypingVisitor extends ExpressionTypingVisitor {
DataFlowInfo commonDataFlowInfo = null;
DataFlowInfo elseDataFlowInfo = context.dataFlowInfo;
for (JetWhenEntry whenEntry : expression.getEntries()) {
JetWhenCondition[] conditions = whenEntry.getConditions();
DataFlowInfos infos = null;
if (whenEntry.isElse()) {
}
else if (conditions.length == 1) {
JetWhenCondition condition = conditions[0];
if (condition != null) {
infos = checkWhenCondition(
subjectExpression, subjectExpression == null,
subjectType, condition,
context, subjectDataFlowValue);
}
DataFlowInfos infosForCondition = getDataFlowInfosForEntryCondition(
whenEntry, context, subjectExpression, subjectType, subjectDataFlowValue);
DataFlowInfo dataFlowInfoForEntryBody;
if (infosForCondition == null) {
dataFlowInfoForEntryBody = elseDataFlowInfo;
}
else {
infos = null;
for (JetWhenCondition condition : conditions) {
DataFlowInfos conditionInfos = checkWhenCondition(subjectExpression, subjectExpression == null, subjectType, condition,
context, subjectDataFlowValue);
if (infos != null) {
infos = new DataFlowInfos(infos.thenInfo.or(conditionInfos.thenInfo), infos.elseInfo.and(conditionInfos.elseInfo));
}
else {
infos = conditionInfos;
}
}
}
DataFlowInfo newDataFlowInfo;
if (infos == null) {
newDataFlowInfo = elseDataFlowInfo;
}
else {
newDataFlowInfo = infos.thenInfo;
elseDataFlowInfo = elseDataFlowInfo.and(infos.elseInfo);
dataFlowInfoForEntryBody = infosForCondition.thenInfo;
elseDataFlowInfo = elseDataFlowInfo.and(infosForCondition.elseInfo);
}
JetExpression bodyExpression = whenEntry.getExpression();
if (bodyExpression != null) {
WritableScope scopeToExtend = newWritableScopeImpl(context, "Scope extended in when entry");
ExpressionTypingContext newContext = contextWithExpectedType
.replaceScope(scopeToExtend).replaceDataFlowInfo(newDataFlowInfo).replaceContextDependency(INDEPENDENT);
.replaceScope(scopeToExtend).replaceDataFlowInfo(dataFlowInfoForEntryBody).replaceContextDependency(INDEPENDENT);
CoercionStrategy coercionStrategy = isStatement ? CoercionStrategy.COERCION_TO_UNIT : CoercionStrategy.NO_COERCION;
JetTypeInfo typeInfo = components.expressionTypingServices.getBlockReturnedTypeWithWritableScope(
scopeToExtend, Collections.singletonList(bodyExpression), coercionStrategy, newContext, context.trace);
@@ -165,6 +141,33 @@ public class PatternMatchingTypingVisitor extends ExpressionTypingVisitor {
return JetTypeInfo.create(null, commonDataFlowInfo);
}
@Nullable
private DataFlowInfos getDataFlowInfosForEntryCondition(
@NotNull JetWhenEntry whenEntry,
@NotNull ExpressionTypingContext context,
@Nullable JetExpression subjectExpression,
@NotNull JetType subjectType,
@NotNull DataFlowValue subjectDataFlowValue
) {
JetWhenCondition[] conditions = whenEntry.getConditions();
if (whenEntry.isElse()) {
return null;
}
DataFlowInfos infos = null;
for (JetWhenCondition condition : conditions) {
DataFlowInfos conditionInfos = checkWhenCondition(subjectExpression, subjectExpression == null, subjectType, condition,
context, subjectDataFlowValue);
if (infos != null) {
infos = new DataFlowInfos(infos.thenInfo.or(conditionInfos.thenInfo), infos.elseInfo.and(conditionInfos.elseInfo));
}
else {
infos = conditionInfos;
}
}
return infos;
}
private DataFlowInfos checkWhenCondition(
@Nullable final JetExpression subjectExpression,
final boolean expectedCondition,