Example usage for com.google.common.base CharMatcher javaIsoControl

Introduction

In this page you can find the example usage for com.google.common.base CharMatcher javaIsoControl.

Prototype

public static CharMatcher javaIsoControl() 

Source Link

Document

Determines whether a character is an ISO control character as specified by Character#isISOControl(char) .

Usage

From source file:com.google.devtools.build.lib.cmdline.LabelValidator.java

/**
 * Performs validity checking of the specified target name. Returns null on success or an error
 * message otherwise./*from   ww  w.j  a  va2  s.  c  o  m*/
 */
@Nullable
public static String validateTargetName(String targetName) {
    // TODO(bazel-team): (2011) allow labels equaling '.' or ending in '/.' for now. If we ever
    // actually configure the target we will report an error, but they will be permitted for
    // data directories.

    // TODO(bazel-team): (2011) Get rid of this code once we have reached critical mass and can
    // pressure developers to clean up their BUILD files.

    // Code optimized for the common case: success.
    int len = targetName.length();
    if (len == 0) {
        return "empty target name";
    }
    // Forbidden start chars:
    char c = targetName.charAt(0);
    if (c == '/') {
        return "target names may not start with '/'";
    } else if (c == '.') {
        if (targetName.startsWith("../") || targetName.equals("..")) {
            return "target names may not contain up-level references '..'";
        } else if (targetName.equals(".")) {
            return null; // See comment above; ideally should be an error.
        } else if (targetName.startsWith("./")) {
            return "target names may not contain '.' as a path segment";
        }
    }

    // Give a friendly error message on CRs in target names
    if (targetName.endsWith("\r")) {
        return "target names may not end with carriage returns "
                + "(perhaps the input source is CRLF-terminated)";
    }

    for (int ii = 0; ii < len; ++ii) {
        c = targetName.charAt(ii);
        if (ALWAYS_ALLOWED_TARGET_CHARACTERS.matches(c)) {
            continue;
        }
        if (c == '.') {
            continue;
        }
        if (c == '/') {
            if (stringRegionMatch(targetName, "/../", ii)) {
                return "target names may not contain up-level references '..'";
            } else if (stringRegionMatch(targetName, "/./", ii)) {
                return "target names may not contain '.' as a path segment";
            } else if (stringRegionMatch(targetName, "//", ii)) {
                return "target names may not contain '//' path separators";
            }
            continue;
        }
        if (CharMatcher.javaIsoControl().matches(c)) {
            return "target names may not contain non-printable characters: '"
                    + String.format("\\x%02X", (int) c) + "'";
        }
        return "target names may not contain '" + c + "'";
    }
    // Forbidden end chars:
    if (c == '.') {
        if (targetName.endsWith("/..")) {
            return "target names may not contain up-level references '..'";
        } else if (targetName.endsWith("/.")) {
            return null; // See comment above; ideally should be an error.
        }
    }
    if (c == '/') {
        return "target names may not end with '/'";
    }
    return null; // ok
}

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