Java Expression类代码示例

import lombok.ast.Expression; //导入依赖的package包/类
public static String argumentsAsString(MethodInvocation node, String messageFormat) {
    StringBuilder buffer = new StringBuilder();
    StrictListAccessor<Expression, MethodInvocation> expressions = node.astArguments();
    for (Expression expression : expressions) {
        if (expression instanceof VariableReference) {
            buffer.append(expression);
            buffer.append(ClassDefinition.DOT);
        } else if (expression instanceof Select) {
            if (buffer.length() != 0) {
                buffer.append(MethodDefinition.formatAsArgument(expression));
            } else {
                buffer.append(expression);
            }
        } else {
            buffer.append(expression);
        }
    }
    return MessageFormat.format(messageFormat, buffer.toString());
}
 

import lombok.ast.Expression; //导入依赖的package包/类
/**
 * Extract non-isDisplayed part or null
 */
@Nullable
private MethodInvocation extractMatcher(JavaContext context, MethodInvocation node) {
    // Only 2 items in allOf()?
    StrictListAccessor<Expression, MethodInvocation> args = node.astArguments();
    if (args == null || args.size() != 2) {
        return null;
    }
    // has isDisplayed()
    boolean foundIsDisplayed = false;
    MethodInvocation other = null;
    for (Expression next : args) {
        if (next instanceof MethodInvocation) {
            MethodInvocation invocation = (MethodInvocation) next;
            if (isNode(context, invocation, MethodDefinitions.IS_DISPLAYED)) {
                foundIsDisplayed = true;
            } else {
                other = invocation;
            }
        }
    }
    if (!foundIsDisplayed || other == null) {
        return null;
    }
    return other;
}
 

import lombok.ast.Expression; //导入依赖的package包/类
@Override
public void visitMethod(@NonNull JavaContext context, AstVisitor visitor,
                        @NonNull MethodInvocation node) {
    VariableReference ref = (VariableReference) node.astOperand();
    if (!"QMUILog".equals(ref.astIdentifier().astValue())) {
        return;
    }

    StrictListAccessor<Expression, MethodInvocation> args = node.astArguments();
    if (args.isEmpty()) {
        return;
    }

    for (Expression expression : args) {
        String input = expression.toString();
        if (input != null && input.contains("fuck")) {
            context.report(
                    ISSUE_F_WORD, expression,
                    context.getLocation(expression), "\uD83D\uDD95");
        }
    }
}
 

import lombok.ast.Expression; //导入依赖的package包/类
@Override
public boolean visitVariableDefinitionEntry(VariableDefinitionEntry node) {
    Expression initializer = node.astInitializer();
    if (initializer instanceof VariableReference) {
        JavaParser.ResolvedNode resolved = mContext.resolve(initializer);
        //noinspection SuspiciousMethodCalls
        if (resolved != null && mVariables.contains(resolved)) {
            JavaParser.ResolvedNode resolvedVariable = mContext.resolve(node);
            if (resolvedVariable instanceof JavaParser.ResolvedVariable) {
                JavaParser.ResolvedVariable variable = (JavaParser.ResolvedVariable) resolvedVariable;
                mVariables.add(variable);
            }
        }
    }
    return super.visitVariableDefinitionEntry(node);
}
 

import lombok.ast.Expression; //导入依赖的package包/类
@Override
public boolean visitBinaryExpression(BinaryExpression node) {
    if (node.astOperator() == BinaryOperator.ASSIGN) {
        Expression rhs = node.astRight();
        if (rhs instanceof VariableReference) {
            JavaParser.ResolvedNode resolved = mContext.resolve(rhs);
            //noinspection SuspiciousMethodCalls
            if (resolved != null && mVariables.contains(resolved)) {
                JavaParser.ResolvedNode resolvedLhs = mContext.resolve(node.astLeft());
                if (resolvedLhs instanceof JavaParser.ResolvedVariable) {
                    JavaParser.ResolvedVariable variable = (JavaParser.ResolvedVariable) resolvedLhs;
                    mVariables.add(variable);
                }
            }
        }
    }
    return super.visitBinaryExpression(node);
}
 

import lombok.ast.Expression; //导入依赖的package包/类
/**
 * 检查Thread.setPriority()节点是否设置了较低优先级
 *
 * @param node  Thread.setPriority()节点
 * @return  true: 较低优先级
 *          false: 不低于当前线程优先级
 */
private boolean validateSetLowerPriority(MethodInvocation node) {
    StrictListAccessor<Expression, MethodInvocation> args = node.astArguments();
    if (null == args || 1 != args.size()) {
        throw new IllegalArgumentException("The number of arguments is mismatched for Thread.setPriority().");
    }

    // 因为setPriority()的参数未必是常量，所以在纯语法分析中直接比较是很困难的，这里为
    // 简化问题，只对设置较高优先级的情形返回false
    String priority = args.first().toString();
    if (priority.contains("NORM_PRIORITY") ||                       // Thread.NORM_PRIORITY
            priority.contains("MAX_PRIORITY") ||                    // Thread.MAX_PRIORITY
            priority.contains("THREAD_PRIORITY_DEFAULT") ||         // Process.THREAD_PRIORITY_DEFAULT
            priority.contains("THREAD_PRIORITY_MORE_FAVORABLE") ||  // Process.THREAD_PRIORITY_MORE_FAVORABLE
            priority.contains("THREAD_PRIORITY_FOREGROUND") ||      // Process.THREAD_PRIORITY_FOREGROUND
            priority.contains("THREAD_PRIORITY_DISPLAY") ||         // Process.THREAD_PRIORITY_DISPLAY
            priority.contains("THREAD_PRIORITY_URGENT_DISPLAY") ||  // Process.THREAD_PRIORITY_URGENT_DISPLAY
            priority.contains("THREAD_PRIORITY_AUDIO") ||           // Process.THREAD_PRIORITY_AUDIO
            priority.contains("THREAD_PRIORITY_URGENT_AUDIO")) {    // Process.THREAD_PRIORITY_URGENT_AUDIO
        return false;
    }
    return true;
}
 

import lombok.ast.Expression; //导入依赖的package包/类
@Override
public void visitMethod(@NonNull JavaContext context, AstVisitor visitor, @NonNull MethodInvocation node) {
    //String methodName = node.astName().astValue();

    StrictListAccessor<Expression, MethodInvocation> arguments = node.astArguments();
    Iterator<Expression> argIterator = arguments.iterator();
    while (argIterator.hasNext()){
        Expression mArg = argIterator.next();
        if (mArg instanceof BinaryExpression){
            context.report(ISSUE,
                    node,
                    context.getLocation(node),
                    "You should pass in a value or variable as a parameter, rather than passing in operands and operator as parameters.");
        }
    }

}
 

import lombok.ast.Expression; //导入依赖的package包/类
/**
 * There are more than one methods overloading in the name of "inflate()" in android.view.LayoutInflater.<br>
 * We only care about those having an param with `@LayoutRes` annotation,
 * for example {public View inflate(@LayoutRes int resource, @Nullable ViewGroup root, boolean attachToRoot)}.<br>
 * This method will find out the resource param with an `@LayoutRes` annotation in String format, for example `R.layout.fragment_blank` .<br>
 * If no such param exists, <B>null</B> will be returned.
 */
private String getParamWithLayoutAnnotation_ForFragment(@NonNull JavaContext context, @NonNull MethodInvocation node) {
    Iterator<Expression> arguments = node.astArguments().iterator();
    Expression argument = arguments.next();

    JavaParser.ResolvedNode resolved = context.resolve(node);
    JavaParser.ResolvedMethod method = (JavaParser.ResolvedMethod) resolved;

    JavaParser.ResolvedAnnotation layoutParamAnnotation = method.getParameterAnnotation("android.support.annotation.LayoutRes", 0);
    if (layoutParamAnnotation != null) {
        return argument.toString();
    } else {
        return null;
    }

}
 

import lombok.ast.Expression; //导入依赖的package包/类
/**
 * There are more than one methods overloading in the name of "inflate()" in android.view.LayoutInflater.<br>
 * We only care about those having an param with `@LayoutRes` annotation,
 * for example {public View inflate(@LayoutRes int resource, @Nullable ViewGroup root, boolean attachToRoot)}.<br>
 * This method will find out the resource param with an `@LayoutRes` annotation in String format, for example `R.layout.fragment_blank` .<br>
 * If no such param exists, <B>null</B> will be returned.
 */
private String getParamWithLayoutAnnotation(@NonNull JavaContext context, @NonNull MethodInvocation node) {
    Iterator<Expression> arguments = node.astArguments().iterator();
    Expression argument = arguments.next();

    JavaParser.ResolvedNode resolved = context.resolve(node);
    JavaParser.ResolvedMethod method = (JavaParser.ResolvedMethod) resolved;

    JavaParser.ResolvedAnnotation layoutParamAnnotation = method.getParameterAnnotation("android.support.annotation.LayoutRes", 0);
    if (layoutParamAnnotation != null) {
        return argument.toString();
    } else {
        return null;
    }

}
 

import lombok.ast.Expression; //导入依赖的package包/类
private boolean verifyColumn(Modifiers node) {
    VariableDefinitionEntry var = getPublicStaticFinalStringVar(node);
    if (var == null)
        return false;

    Expression initializer = var.astInitializer();
    if (!(initializer instanceof StringLiteral))
        return false;

    String name = SimplName.from(var.astName().astValue());
    String value = ((StringLiteral) initializer).astValue();

    if (!name.equals(value))
        mContext.report(COLUMN_NAME, node, mContext.getLocation(node.getParent()), "must match " + SimplName.quote(name));

    if (SqlKeywords.contain(name))
        mContext.report(SQL_KEYWORD, mContext.getLocation(var.astName()), "use quoted with ContentValues");

    return true;
}
 

import lombok.ast.Expression; //导入依赖的package包/类
private boolean verifyConstraint(Modifiers node) {
    VariableDefinitionEntry var = getPublicStaticFinalStringVar(node);
    if (var == null)
        return false;

    Expression initializer = var.astInitializer();
    if (!(initializer instanceof StringLiteral))
        return false;

    String name = SimplName.from(var.astName().astValue());
    String value = ((StringLiteral) initializer).astValue();

    if (!name.equals(value))
        mContext.report(CONSTRAINT_NAME, node, mContext.getLocation(node.getParent()), "must match " + SimplName.quote(name));

    return true;
}
 

import lombok.ast.Expression; //导入依赖的package包/类
@Override
public boolean visitMethodInvocation(MethodInvocation node) {
    if (node.astName().astValue().equals(SET_THEME)) {
        // Look at argument
        StrictListAccessor<Expression, MethodInvocation> args = node.astArguments();
        if (args.size() == 1) {
            Expression arg = args.first();
            if (arg instanceof Select) {
                String resource = arg.toString();
                if (resource.startsWith(R_STYLE_PREFIX)) {
                    if (mActivityToTheme == null) {
                        mActivityToTheme = new HashMap<String, String>();
                    }
                    String name = ((Select) arg).astIdentifier().astValue();
                    mActivityToTheme.put(mClassFqn, STYLE_RESOURCE_PREFIX + name);
                }
            }
        }
    }

    return false;
}
 

import lombok.ast.Expression; //导入依赖的package包/类
private static void ensureAtLeast(@NonNull JavaContext context,
        @NonNull MethodInvocation node, int parameter, long min) {
    Iterator<Expression> iterator = node.astArguments().iterator();
    Expression argument = null;
    for (int i = 0; i <= parameter; i++) {
        if (!iterator.hasNext()) {
            return;
        }
        argument = iterator.next();
    }
    if (argument == null) {
        return;
    }

    long value = getLongValue(context, argument);
    if (value < min) {
        String message = String.format("Value will be forced up to %d as of Android 5.1; "
                + "don't rely on this to be exact", min);
        context.report(ISSUE, argument, context.getLocation(argument), message);
    }
}
 

import lombok.ast.Expression; //导入依赖的package包/类
@Nullable
private static String getLhs(@NonNull MethodInvocation call) {
    Node parent = call.getParent();
    if (parent instanceof Cast) {
        parent = parent.getParent();
    }

    if (parent instanceof VariableDefinitionEntry) {
        VariableDefinitionEntry vde = (VariableDefinitionEntry) parent;
        return vde.astName().astValue();
    } else if (parent instanceof BinaryExpression) {
        BinaryExpression be = (BinaryExpression) parent;
        Expression left = be.astLeft();
        if (left instanceof VariableReference || left instanceof Select) {
            return be.astLeft().toString();
        } else if (left instanceof ArrayAccess) {
            ArrayAccess aa = (ArrayAccess) left;
            return aa.astOperand().toString();
        }
    }

    return null;
}
 

import lombok.ast.Expression; //导入依赖的package包/类
@Override
public void visitMethod(@NonNull JavaContext context, @Nullable AstVisitor visitor,
        @NonNull MethodInvocation node) {
    ResolvedNode resolved = context.resolve(node);

    if (!(resolved instanceof ResolvedMethod) ||
            !((ResolvedMethod) resolved).getContainingClass()
                    .isSubclassOf(PACKAGE_MANAGER_CLASS, false)) {
        return;
    }
    StrictListAccessor<Expression, MethodInvocation> argumentList = node.astArguments();

    // Ignore if the method doesn't fit our description.
    if (argumentList != null && argumentList.size() == 2) {
        TypeDescriptor firstParameterType = context.getType(argumentList.first());
        if (firstParameterType != null
            && firstParameterType.matchesSignature(JavaParser.TYPE_STRING)) {
            maybeReportIssue(calculateValue(context, argumentList.last()), context, node);
        }
    }
}