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Diffstat (limited to 'third_party/protobuf/3.6.0/java/core/src/main/java/com/google/protobuf/TextFormat.java')
| -rw-r--r-- | third_party/protobuf/3.6.0/java/core/src/main/java/com/google/protobuf/TextFormat.java | 2189 |
1 files changed, 2189 insertions, 0 deletions
diff --git a/third_party/protobuf/3.6.0/java/core/src/main/java/com/google/protobuf/TextFormat.java b/third_party/protobuf/3.6.0/java/core/src/main/java/com/google/protobuf/TextFormat.java new file mode 100644 index 0000000000..25c3474f91 --- /dev/null +++ b/third_party/protobuf/3.6.0/java/core/src/main/java/com/google/protobuf/TextFormat.java @@ -0,0 +1,2189 @@ +// Protocol Buffers - Google's data interchange format +// Copyright 2008 Google Inc. All rights reserved. +// https://developers.google.com/protocol-buffers/ +// +// Redistribution and use in source and binary forms, with or without +// modification, are permitted provided that the following conditions are +// met: +// +// * Redistributions of source code must retain the above copyright +// notice, this list of conditions and the following disclaimer. +// * Redistributions in binary form must reproduce the above +// copyright notice, this list of conditions and the following disclaimer +// in the documentation and/or other materials provided with the +// distribution. +// * Neither the name of Google Inc. nor the names of its +// contributors may be used to endorse or promote products derived from +// this software without specific prior written permission. +// +// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS +// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT +// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR +// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT +// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, +// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT +// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, +// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY +// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT +// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE +// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + +package com.google.protobuf; + +import com.google.protobuf.Descriptors.Descriptor; +import com.google.protobuf.Descriptors.EnumDescriptor; +import com.google.protobuf.Descriptors.EnumValueDescriptor; +import com.google.protobuf.Descriptors.FieldDescriptor; +import java.io.IOException; +import java.math.BigInteger; +import java.nio.CharBuffer; +import java.util.ArrayList; +import java.util.List; +import java.util.Locale; +import java.util.Map; +import java.util.logging.Logger; +import java.util.regex.Matcher; +import java.util.regex.Pattern; + +/** + * Provide text parsing and formatting support for proto2 instances. + * The implementation largely follows google/protobuf/text_format.cc. + * + * @author wenboz@google.com Wenbo Zhu + * @author kenton@google.com Kenton Varda + */ +public final class TextFormat { + private TextFormat() {} + + private static final Logger logger = Logger.getLogger(TextFormat.class.getName()); + + /** + * Outputs a textual representation of the Protocol Message supplied into + * the parameter output. (This representation is the new version of the + * classic "ProtocolPrinter" output from the original Protocol Buffer system) + */ + public static void print( + final MessageOrBuilder message, final Appendable output) + throws IOException { + Printer.DEFAULT.print(message, multiLineOutput(output)); + } + + /** Outputs a textual representation of {@code fields} to {@code output}. */ + public static void print(final UnknownFieldSet fields, + final Appendable output) + throws IOException { + Printer.DEFAULT.printUnknownFields(fields, multiLineOutput(output)); + } + + /** + * Same as {@code print()}, except that non-ASCII characters are not + * escaped. + */ + public static void printUnicode( + final MessageOrBuilder message, final Appendable output) + throws IOException { + Printer.UNICODE.print(message, multiLineOutput(output)); + } + + /** + * Same as {@code print()}, except that non-ASCII characters are not + * escaped. + */ + public static void printUnicode(final UnknownFieldSet fields, + final Appendable output) + throws IOException { + Printer.UNICODE.printUnknownFields(fields, multiLineOutput(output)); + } + + /** + * Generates a human readable form of this message, useful for debugging and + * other purposes, with no newline characters. + */ + public static String shortDebugString(final MessageOrBuilder message) { + try { + final StringBuilder text = new StringBuilder(); + Printer.DEFAULT.print(message, singleLineOutput(text)); + return text.toString(); + } catch (IOException e) { + throw new IllegalStateException(e); + } + } + + /** + * Generates a human readable form of the field, useful for debugging + * and other purposes, with no newline characters. + */ + public static String shortDebugString(final FieldDescriptor field, + final Object value) { + try { + final StringBuilder text = new StringBuilder(); + Printer.DEFAULT.printField(field, value, singleLineOutput(text)); + return text.toString(); + } catch (IOException e) { + throw new IllegalStateException(e); + } + } + + /** + * Generates a human readable form of the unknown fields, useful for debugging + * and other purposes, with no newline characters. + */ + public static String shortDebugString(final UnknownFieldSet fields) { + try { + final StringBuilder text = new StringBuilder(); + Printer.DEFAULT.printUnknownFields(fields, singleLineOutput(text)); + return text.toString(); + } catch (IOException e) { + throw new IllegalStateException(e); + } + } + + /** + * Like {@code print()}, but writes directly to a {@code String} and + * returns it. + */ + public static String printToString(final MessageOrBuilder message) { + try { + final StringBuilder text = new StringBuilder(); + print(message, text); + return text.toString(); + } catch (IOException e) { + throw new IllegalStateException(e); + } + } + + /** + * Like {@code print()}, but writes directly to a {@code String} and + * returns it. + */ + public static String printToString(final UnknownFieldSet fields) { + try { + final StringBuilder text = new StringBuilder(); + print(fields, text); + return text.toString(); + } catch (IOException e) { + throw new IllegalStateException(e); + } + } + + /** + * Same as {@code printToString()}, except that non-ASCII characters + * in string type fields are not escaped in backslash+octals. + */ + public static String printToUnicodeString(final MessageOrBuilder message) { + try { + final StringBuilder text = new StringBuilder(); + Printer.UNICODE.print(message, multiLineOutput(text)); + return text.toString(); + } catch (IOException e) { + throw new IllegalStateException(e); + } + } + + /** + * Same as {@code printToString()}, except that non-ASCII characters + * in string type fields are not escaped in backslash+octals. + */ + public static String printToUnicodeString(final UnknownFieldSet fields) { + try { + final StringBuilder text = new StringBuilder(); + Printer.UNICODE.printUnknownFields(fields, multiLineOutput(text)); + return text.toString(); + } catch (IOException e) { + throw new IllegalStateException(e); + } + } + + public static void printField(final FieldDescriptor field, + final Object value, + final Appendable output) + throws IOException { + Printer.DEFAULT.printField(field, value, multiLineOutput(output)); + } + + public static String printFieldToString(final FieldDescriptor field, + final Object value) { + try { + final StringBuilder text = new StringBuilder(); + printField(field, value, text); + return text.toString(); + } catch (IOException e) { + throw new IllegalStateException(e); + } + } + + /** + * Outputs a unicode textual representation of the value of given field value. + * + * <p>Same as {@code printFieldValue()}, except that non-ASCII characters in string type fields + * are not escaped in backslash+octals. + * + * @param field the descriptor of the field + * @param value the value of the field + * @param output the output to which to append the formatted value + * @throws ClassCastException if the value is not appropriate for the given field descriptor + * @throws IOException if there is an exception writing to the output + */ + public static void printUnicodeFieldValue( + final FieldDescriptor field, final Object value, final Appendable output) throws IOException { + Printer.UNICODE.printFieldValue(field, value, multiLineOutput(output)); + } + + /** + * Outputs a textual representation of the value of given field value. + * + * @param field the descriptor of the field + * @param value the value of the field + * @param output the output to which to append the formatted value + * @throws ClassCastException if the value is not appropriate for the + * given field descriptor + * @throws IOException if there is an exception writing to the output + */ + public static void printFieldValue(final FieldDescriptor field, + final Object value, + final Appendable output) + throws IOException { + Printer.DEFAULT.printFieldValue(field, value, multiLineOutput(output)); + } + + /** + * Outputs a textual representation of the value of an unknown field. + * + * @param tag the field's tag number + * @param value the value of the field + * @param output the output to which to append the formatted value + * @throws ClassCastException if the value is not appropriate for the + * given field descriptor + * @throws IOException if there is an exception writing to the output + */ + public static void printUnknownFieldValue(final int tag, + final Object value, + final Appendable output) + throws IOException { + printUnknownFieldValue(tag, value, multiLineOutput(output)); + } + + private static void printUnknownFieldValue(final int tag, + final Object value, + final TextGenerator generator) + throws IOException { + switch (WireFormat.getTagWireType(tag)) { + case WireFormat.WIRETYPE_VARINT: + generator.print(unsignedToString((Long) value)); + break; + case WireFormat.WIRETYPE_FIXED32: + generator.print( + String.format((Locale) null, "0x%08x", (Integer) value)); + break; + case WireFormat.WIRETYPE_FIXED64: + generator.print(String.format((Locale) null, "0x%016x", (Long) value)); + break; + case WireFormat.WIRETYPE_LENGTH_DELIMITED: + try { + // Try to parse and print the field as an embedded message + UnknownFieldSet message = UnknownFieldSet.parseFrom((ByteString) value); + generator.print("{"); + generator.eol(); + generator.indent(); + Printer.DEFAULT.printUnknownFields(message, generator); + generator.outdent(); + generator.print("}"); + } catch (InvalidProtocolBufferException e) { + // If not parseable as a message, print as a String + generator.print("\""); + generator.print(escapeBytes((ByteString) value)); + generator.print("\""); + } + break; + case WireFormat.WIRETYPE_START_GROUP: + Printer.DEFAULT.printUnknownFields((UnknownFieldSet) value, generator); + break; + default: + throw new IllegalArgumentException("Bad tag: " + tag); + } + } + + /** Helper class for converting protobufs to text. */ + private static final class Printer { + // Printer instance which escapes non-ASCII characters. + static final Printer DEFAULT = new Printer(true); + // Printer instance which emits Unicode (it still escapes newlines and quotes in strings). + static final Printer UNICODE = new Printer(false); + + /** Whether to escape non ASCII characters with backslash and octal. */ + private final boolean escapeNonAscii; + + private Printer(boolean escapeNonAscii) { + this.escapeNonAscii = escapeNonAscii; + } + + private void print( + final MessageOrBuilder message, final TextGenerator generator) + throws IOException { + for (Map.Entry<FieldDescriptor, Object> field + : message.getAllFields().entrySet()) { + printField(field.getKey(), field.getValue(), generator); + } + printUnknownFields(message.getUnknownFields(), generator); + } + + private void printField(final FieldDescriptor field, final Object value, + final TextGenerator generator) throws IOException { + if (field.isRepeated()) { + // Repeated field. Print each element. + for (Object element : (List<?>) value) { + printSingleField(field, element, generator); + } + } else { + printSingleField(field, value, generator); + } + } + + private void printSingleField(final FieldDescriptor field, + final Object value, + final TextGenerator generator) + throws IOException { + if (field.isExtension()) { + generator.print("["); + // We special-case MessageSet elements for compatibility with proto1. + if (field.getContainingType().getOptions().getMessageSetWireFormat() + && (field.getType() == FieldDescriptor.Type.MESSAGE) + && (field.isOptional()) + // object equality + && (field.getExtensionScope() == field.getMessageType())) { + generator.print(field.getMessageType().getFullName()); + } else { + generator.print(field.getFullName()); + } + generator.print("]"); + } else { + if (field.getType() == FieldDescriptor.Type.GROUP) { + // Groups must be serialized with their original capitalization. + generator.print(field.getMessageType().getName()); + } else { + generator.print(field.getName()); + } + } + + if (field.getJavaType() == FieldDescriptor.JavaType.MESSAGE) { + generator.print(" {"); + generator.eol(); + generator.indent(); + } else { + generator.print(": "); + } + + printFieldValue(field, value, generator); + + if (field.getJavaType() == FieldDescriptor.JavaType.MESSAGE) { + generator.outdent(); + generator.print("}"); + } + generator.eol(); + } + + private void printFieldValue(final FieldDescriptor field, + final Object value, + final TextGenerator generator) + throws IOException { + switch (field.getType()) { + case INT32: + case SINT32: + case SFIXED32: + generator.print(((Integer) value).toString()); + break; + + case INT64: + case SINT64: + case SFIXED64: + generator.print(((Long) value).toString()); + break; + + case BOOL: + generator.print(((Boolean) value).toString()); + break; + + case FLOAT: + generator.print(((Float) value).toString()); + break; + + case DOUBLE: + generator.print(((Double) value).toString()); + break; + + case UINT32: + case FIXED32: + generator.print(unsignedToString((Integer) value)); + break; + + case UINT64: + case FIXED64: + generator.print(unsignedToString((Long) value)); + break; + + case STRING: + generator.print("\""); + generator.print(escapeNonAscii + ? TextFormatEscaper.escapeText((String) value) + : escapeDoubleQuotesAndBackslashes((String) value) + .replace("\n", "\\n")); + generator.print("\""); + break; + + case BYTES: + generator.print("\""); + if (value instanceof ByteString) { + generator.print(escapeBytes((ByteString) value)); + } else { + generator.print(escapeBytes((byte[]) value)); + } + generator.print("\""); + break; + + case ENUM: + generator.print(((EnumValueDescriptor) value).getName()); + break; + + case MESSAGE: + case GROUP: + print((Message) value, generator); + break; + } + } + + private void printUnknownFields(final UnknownFieldSet unknownFields, + final TextGenerator generator) + throws IOException { + for (Map.Entry<Integer, UnknownFieldSet.Field> entry : + unknownFields.asMap().entrySet()) { + final int number = entry.getKey(); + final UnknownFieldSet.Field field = entry.getValue(); + printUnknownField(number, WireFormat.WIRETYPE_VARINT, + field.getVarintList(), generator); + printUnknownField(number, WireFormat.WIRETYPE_FIXED32, + field.getFixed32List(), generator); + printUnknownField(number, WireFormat.WIRETYPE_FIXED64, + field.getFixed64List(), generator); + printUnknownField(number, WireFormat.WIRETYPE_LENGTH_DELIMITED, + field.getLengthDelimitedList(), generator); + for (final UnknownFieldSet value : field.getGroupList()) { + generator.print(entry.getKey().toString()); + generator.print(" {"); + generator.eol(); + generator.indent(); + printUnknownFields(value, generator); + generator.outdent(); + generator.print("}"); + generator.eol(); + } + } + } + + private void printUnknownField(final int number, + final int wireType, + final List<?> values, + final TextGenerator generator) + throws IOException { + for (final Object value : values) { + generator.print(String.valueOf(number)); + generator.print(": "); + printUnknownFieldValue(wireType, value, generator); + generator.eol(); + } + } + } + + /** Convert an unsigned 32-bit integer to a string. */ + public static String unsignedToString(final int value) { + if (value >= 0) { + return Integer.toString(value); + } else { + return Long.toString(value & 0x00000000FFFFFFFFL); + } + } + + /** Convert an unsigned 64-bit integer to a string. */ + public static String unsignedToString(final long value) { + if (value >= 0) { + return Long.toString(value); + } else { + // Pull off the most-significant bit so that BigInteger doesn't think + // the number is negative, then set it again using setBit(). + return BigInteger.valueOf(value & 0x7FFFFFFFFFFFFFFFL) + .setBit(63).toString(); + } + } + + private static TextGenerator multiLineOutput(Appendable output) { + return new TextGenerator(output, false); + } + + private static TextGenerator singleLineOutput(Appendable output) { + return new TextGenerator(output, true); + } + + /** + * An inner class for writing text to the output stream. + */ + private static final class TextGenerator { + private final Appendable output; + private final StringBuilder indent = new StringBuilder(); + private final boolean singleLineMode; + // While technically we are "at the start of a line" at the very beginning of the output, all + // we would do in response to this is emit the (zero length) indentation, so it has no effect. + // Setting it false here does however suppress an unwanted leading space in single-line mode. + private boolean atStartOfLine = false; + + private TextGenerator(final Appendable output, boolean singleLineMode) { + this.output = output; + this.singleLineMode = singleLineMode; + } + + /** + * Indent text by two spaces. After calling Indent(), two spaces will be + * inserted at the beginning of each line of text. Indent() may be called + * multiple times to produce deeper indents. + */ + public void indent() { + indent.append(" "); + } + + /** + * Reduces the current indent level by two spaces, or crashes if the indent + * level is zero. + */ + public void outdent() { + final int length = indent.length(); + if (length == 0) { + throw new IllegalArgumentException( + " Outdent() without matching Indent()."); + } + indent.setLength(length - 2); + } + + /** + * Print text to the output stream. Bare newlines are never expected to be passed to this + * method; to indicate the end of a line, call "eol()". + */ + public void print(final CharSequence text) throws IOException { + if (atStartOfLine) { + atStartOfLine = false; + output.append(singleLineMode ? " " : indent); + } + output.append(text); + } + + /** + * Signifies reaching the "end of the current line" in the output. In single-line mode, this + * does not result in a newline being emitted, but ensures that a separating space is written + * before the next output. + */ + public void eol() throws IOException { + if (!singleLineMode) { + output.append("\n"); + } + atStartOfLine = true; + } + } + + // ================================================================= + // Parsing + + /** + * Represents a stream of tokens parsed from a {@code String}. + * + * <p>The Java standard library provides many classes that you might think + * would be useful for implementing this, but aren't. For example: + * + * <ul> + * <li>{@code java.io.StreamTokenizer}: This almost does what we want -- or, + * at least, something that would get us close to what we want -- except + * for one fatal flaw: It automatically un-escapes strings using Java + * escape sequences, which do not include all the escape sequences we + * need to support (e.g. '\x'). + * <li>{@code java.util.Scanner}: This seems like a great way at least to + * parse regular expressions out of a stream (so we wouldn't have to load + * the entire input into a single string before parsing). Sadly, + * {@code Scanner} requires that tokens be delimited with some delimiter. + * Thus, although the text "foo:" should parse to two tokens ("foo" and + * ":"), {@code Scanner} would recognize it only as a single token. + * Furthermore, {@code Scanner} provides no way to inspect the contents + * of delimiters, making it impossible to keep track of line and column + * numbers. + * </ul> + * + * <p>Luckily, Java's regular expression support does manage to be useful to + * us. (Barely: We need {@code Matcher.usePattern()}, which is new in + * Java 1.5.) So, we can use that, at least. Unfortunately, this implies + * that we need to have the entire input in one contiguous string. + */ + private static final class Tokenizer { + private final CharSequence text; + private final Matcher matcher; + private String currentToken; + + // The character index within this.text at which the current token begins. + private int pos = 0; + + // The line and column numbers of the current token. + private int line = 0; + private int column = 0; + + // The line and column numbers of the previous token (allows throwing + // errors *after* consuming). + private int previousLine = 0; + private int previousColumn = 0; + + // We use possessive quantifiers (*+ and ++) because otherwise the Java + // regex matcher has stack overflows on large inputs. + private static final Pattern WHITESPACE = + Pattern.compile("(\\s|(#.*$))++", Pattern.MULTILINE); + private static final Pattern TOKEN = Pattern.compile( + "[a-zA-Z_][0-9a-zA-Z_+-]*+|" + // an identifier + "[.]?[0-9+-][0-9a-zA-Z_.+-]*+|" + // a number + "\"([^\"\n\\\\]|\\\\.)*+(\"|\\\\?$)|" + // a double-quoted string + "\'([^\'\n\\\\]|\\\\.)*+(\'|\\\\?$)", // a single-quoted string + Pattern.MULTILINE); + + private static final Pattern DOUBLE_INFINITY = Pattern.compile( + "-?inf(inity)?", + Pattern.CASE_INSENSITIVE); + private static final Pattern FLOAT_INFINITY = Pattern.compile( + "-?inf(inity)?f?", + Pattern.CASE_INSENSITIVE); + private static final Pattern FLOAT_NAN = Pattern.compile( + "nanf?", + Pattern.CASE_INSENSITIVE); + + /** Construct a tokenizer that parses tokens from the given text. */ + private Tokenizer(final CharSequence text) { + this.text = text; + this.matcher = WHITESPACE.matcher(text); + skipWhitespace(); + nextToken(); + } + + int getPreviousLine() { + return previousLine; + } + + int getPreviousColumn() { + return previousColumn; + } + + int getLine() { + return line; + } + + int getColumn() { + return column; + } + + /** Are we at the end of the input? */ + public boolean atEnd() { + return currentToken.length() == 0; + } + + /** Advance to the next token. */ + public void nextToken() { + previousLine = line; + previousColumn = column; + + // Advance the line counter to the current position. + while (pos < matcher.regionStart()) { + if (text.charAt(pos) == '\n') { + ++line; + column = 0; + } else { + ++column; + } + ++pos; + } + + // Match the next token. + if (matcher.regionStart() == matcher.regionEnd()) { + // EOF + currentToken = ""; + } else { + matcher.usePattern(TOKEN); + if (matcher.lookingAt()) { + currentToken = matcher.group(); + matcher.region(matcher.end(), matcher.regionEnd()); + } else { + // Take one character. + currentToken = String.valueOf(text.charAt(pos)); + matcher.region(pos + 1, matcher.regionEnd()); + } + + skipWhitespace(); + } + } + + /** + * Skip over any whitespace so that the matcher region starts at the next + * token. + */ + private void skipWhitespace() { + matcher.usePattern(WHITESPACE); + if (matcher.lookingAt()) { + matcher.region(matcher.end(), matcher.regionEnd()); + } + } + + /** + * If the next token exactly matches {@code token}, consume it and return + * {@code true}. Otherwise, return {@code false} without doing anything. + */ + public boolean tryConsume(final String token) { + if (currentToken.equals(token)) { + nextToken(); + return true; + } else { + return false; + } + } + + /** + * If the next token exactly matches {@code token}, consume it. Otherwise, + * throw a {@link ParseException}. + */ + public void consume(final String token) throws ParseException { + if (!tryConsume(token)) { + throw parseException("Expected \"" + token + "\"."); + } + } + + /** + * Returns {@code true} if the next token is an integer, but does + * not consume it. + */ + public boolean lookingAtInteger() { + if (currentToken.length() == 0) { + return false; + } + + final char c = currentToken.charAt(0); + return ('0' <= c && c <= '9') + || c == '-' || c == '+'; + } + + /** + * Returns {@code true} if the current token's text is equal to that + * specified. + */ + public boolean lookingAt(String text) { + return currentToken.equals(text); + } + + /** + * If the next token is an identifier, consume it and return its value. + * Otherwise, throw a {@link ParseException}. + */ + public String consumeIdentifier() throws ParseException { + for (int i = 0; i < currentToken.length(); i++) { + final char c = currentToken.charAt(i); + if (('a' <= c && c <= 'z') + || ('A' <= c && c <= 'Z') + || ('0' <= c && c <= '9') + || (c == '_') || (c == '.')) { + // OK + } else { + throw parseException( + "Expected identifier. Found '" + currentToken + "'"); + } + } + + final String result = currentToken; + nextToken(); + return result; + } + + /** + * If the next token is an identifier, consume it and return {@code true}. + * Otherwise, return {@code false} without doing anything. + */ + public boolean tryConsumeIdentifier() { + try { + consumeIdentifier(); + return true; + } catch (ParseException e) { + return false; + } + } + + /** + * If the next token is a 32-bit signed integer, consume it and return its + * value. Otherwise, throw a {@link ParseException}. + */ + public int consumeInt32() throws ParseException { + try { + final int result = parseInt32(currentToken); + nextToken(); + return result; + } catch (NumberFormatException e) { + throw integerParseException(e); + } + } + + /** + * If the next token is a 32-bit unsigned integer, consume it and return its + * value. Otherwise, throw a {@link ParseException}. + */ + public int consumeUInt32() throws ParseException { + try { + final int result = parseUInt32(currentToken); + nextToken(); + return result; + } catch (NumberFormatException e) { + throw integerParseException(e); + } + } + + /** + * If the next token is a 64-bit signed integer, consume it and return its + * value. Otherwise, throw a {@link ParseException}. + */ + public long consumeInt64() throws ParseException { + try { + final long result = parseInt64(currentToken); + nextToken(); + return result; + } catch (NumberFormatException e) { + throw integerParseException(e); + } + } + + /** + * If the next token is a 64-bit signed integer, consume it and return + * {@code true}. Otherwise, return {@code false} without doing anything. + */ + public boolean tryConsumeInt64() { + try { + consumeInt64(); + return true; + } catch (ParseException e) { + return false; + } + } + + /** + * If the next token is a 64-bit unsigned integer, consume it and return its + * value. Otherwise, throw a {@link ParseException}. + */ + public long consumeUInt64() throws ParseException { + try { + final long result = parseUInt64(currentToken); + nextToken(); + return result; + } catch (NumberFormatException e) { + throw integerParseException(e); + } + } + + /** + * If the next token is a 64-bit unsigned integer, consume it and return + * {@code true}. Otherwise, return {@code false} without doing anything. + */ + public boolean tryConsumeUInt64() { + try { + consumeUInt64(); + return true; + } catch (ParseException e) { + return false; + } + } + + /** + * If the next token is a double, consume it and return its value. + * Otherwise, throw a {@link ParseException}. + */ + public double consumeDouble() throws ParseException { + // We need to parse infinity and nan separately because + // Double.parseDouble() does not accept "inf", "infinity", or "nan". + if (DOUBLE_INFINITY.matcher(currentToken).matches()) { + final boolean negative = currentToken.startsWith("-"); + nextToken(); + return negative ? Double.NEGATIVE_INFINITY : Double.POSITIVE_INFINITY; + } + if (currentToken.equalsIgnoreCase("nan")) { + nextToken(); + return Double.NaN; + } + try { + final double result = Double.parseDouble(currentToken); + nextToken(); + return result; + } catch (NumberFormatException e) { + throw floatParseException(e); + } + } + + /** + * If the next token is a double, consume it and return {@code true}. + * Otherwise, return {@code false} without doing anything. + */ + public boolean tryConsumeDouble() { + try { + consumeDouble(); + return true; + } catch (ParseException e) { + return false; + } + } + + /** + * If the next token is a float, consume it and return its value. + * Otherwise, throw a {@link ParseException}. + */ + public float consumeFloat() throws ParseException { + // We need to parse infinity and nan separately because + // Float.parseFloat() does not accept "inf", "infinity", or "nan". + if (FLOAT_INFINITY.matcher(currentToken).matches()) { + final boolean negative = currentToken.startsWith("-"); + nextToken(); + return negative ? Float.NEGATIVE_INFINITY : Float.POSITIVE_INFINITY; + } + if (FLOAT_NAN.matcher(currentToken).matches()) { + nextToken(); + return Float.NaN; + } + try { + final float result = Float.parseFloat(currentToken); + nextToken(); + return result; + } catch (NumberFormatException e) { + throw floatParseException(e); + } + } + + /** + * If the next token is a float, consume it and return {@code true}. + * Otherwise, return {@code false} without doing anything. + */ + public boolean tryConsumeFloat() { + try { + consumeFloat(); + return true; + } catch (ParseException e) { + return false; + } + } + + /** + * If the next token is a boolean, consume it and return its value. + * Otherwise, throw a {@link ParseException}. + */ + public boolean consumeBoolean() throws ParseException { + if (currentToken.equals("true") + || currentToken.equals("True") + || currentToken.equals("t") + || currentToken.equals("1")) { + nextToken(); + return true; + } else if (currentToken.equals("false") + || currentToken.equals("False") + || currentToken.equals("f") + || currentToken.equals("0")) { + nextToken(); + return false; + } else { + throw parseException("Expected \"true\" or \"false\". Found \"" + currentToken + "\"."); + } + } + + /** + * If the next token is a string, consume it and return its (unescaped) + * value. Otherwise, throw a {@link ParseException}. + */ + public String consumeString() throws ParseException { + return consumeByteString().toStringUtf8(); + } + + /** + * If the next token is a string, consume it and return true. Otherwise, + * return false. + */ + public boolean tryConsumeString() { + try { + consumeString(); + return true; + } catch (ParseException e) { + return false; + } + } + + /** + * If the next token is a string, consume it, unescape it as a + * {@link ByteString}, and return it. Otherwise, throw a + * {@link ParseException}. + */ + public ByteString consumeByteString() throws ParseException { + List<ByteString> list = new ArrayList<ByteString>(); + consumeByteString(list); + while (currentToken.startsWith("'") || currentToken.startsWith("\"")) { + consumeByteString(list); + } + return ByteString.copyFrom(list); + } + + /** + * Like {@link #consumeByteString()} but adds each token of the string to + * the given list. String literals (whether bytes or text) may come in + * multiple adjacent tokens which are automatically concatenated, like in + * C or Python. + */ + private void consumeByteString(List<ByteString> list) + throws ParseException { + final char quote = currentToken.length() > 0 + ? currentToken.charAt(0) + : '\0'; + if (quote != '\"' && quote != '\'') { + throw parseException("Expected string."); + } + + if (currentToken.length() < 2 + || currentToken.charAt(currentToken.length() - 1) != quote) { + throw parseException("String missing ending quote."); + } + + try { + final String escaped = + currentToken.substring(1, currentToken.length() - 1); + final ByteString result = unescapeBytes(escaped); + nextToken(); + list.add(result); + } catch (InvalidEscapeSequenceException e) { + throw parseException(e.getMessage()); + } + } + + /** + * Returns a {@link ParseException} with the current line and column + * numbers in the description, suitable for throwing. + */ + public ParseException parseException(final String description) { + // Note: People generally prefer one-based line and column numbers. + return new ParseException( + line + 1, column + 1, description); + } + + /** + * Returns a {@link ParseException} with the line and column numbers of + * the previous token in the description, suitable for throwing. + */ + public ParseException parseExceptionPreviousToken( + final String description) { + // Note: People generally prefer one-based line and column numbers. + return new ParseException( + previousLine + 1, previousColumn + 1, description); + } + + /** + * Constructs an appropriate {@link ParseException} for the given + * {@code NumberFormatException} when trying to parse an integer. + */ + private ParseException integerParseException( + final NumberFormatException e) { + return parseException("Couldn't parse integer: " + e.getMessage()); + } + + /** + * Constructs an appropriate {@link ParseException} for the given + * {@code NumberFormatException} when trying to parse a float or double. + */ + private ParseException floatParseException(final NumberFormatException e) { + return parseException("Couldn't parse number: " + e.getMessage()); + } + + /** + * Returns a {@link UnknownFieldParseException} with the line and column + * numbers of the previous token in the description, and the unknown field + * name, suitable for throwing. + */ + public UnknownFieldParseException unknownFieldParseExceptionPreviousToken( + final String unknownField, final String description) { + // Note: People generally prefer one-based line and column numbers. + return new UnknownFieldParseException( + previousLine + 1, previousColumn + 1, unknownField, description); + } + } + + /** Thrown when parsing an invalid text format message. */ + public static class ParseException extends IOException { + private static final long serialVersionUID = 3196188060225107702L; + + private final int line; + private final int column; + + /** Create a new instance, with -1 as the line and column numbers. */ + public ParseException(final String message) { + this(-1, -1, message); + } + + /** + * Create a new instance + * + * @param line the line number where the parse error occurred, + * using 1-offset. + * @param column the column number where the parser error occurred, + * using 1-offset. + */ + public ParseException(final int line, final int column, + final String message) { + super(Integer.toString(line) + ":" + column + ": " + message); + this.line = line; + this.column = column; + } + + /** + * Return the line where the parse exception occurred, or -1 when + * none is provided. The value is specified as 1-offset, so the first + * line is line 1. + */ + public int getLine() { + return line; + } + + /** + * Return the column where the parse exception occurred, or -1 when + * none is provided. The value is specified as 1-offset, so the first + * line is line 1. + */ + public int getColumn() { + return column; + } + } + + /** + * Thrown when encountering an unknown field while parsing + * a text format message. + */ + public static class UnknownFieldParseException extends ParseException { + private final String unknownField; + + /** + * Create a new instance, with -1 as the line and column numbers, and an + * empty unknown field name. + */ + public UnknownFieldParseException(final String message) { + this(-1, -1, "", message); + } + + /** + * Create a new instance + * + * @param line the line number where the parse error occurred, + * using 1-offset. + * @param column the column number where the parser error occurred, + * using 1-offset. + * @param unknownField the name of the unknown field found while parsing. + */ + public UnknownFieldParseException(final int line, final int column, + final String unknownField, final String message) { + super(line, column, message); + this.unknownField = unknownField; + } + + /** + * Return the name of the unknown field encountered while parsing the + * protocol buffer string. + */ + public String getUnknownField() { + return unknownField; + } + } + + private static final Parser PARSER = Parser.newBuilder().build(); + + /** + * Return a {@link Parser} instance which can parse text-format + * messages. The returned instance is thread-safe. + */ + public static Parser getParser() { + return PARSER; + } + + /** + * Parse a text-format message from {@code input} and merge the contents + * into {@code builder}. + */ + public static void merge(final Readable input, + final Message.Builder builder) + throws IOException { + PARSER.merge(input, builder); + } + + /** + * Parse a text-format message from {@code input} and merge the contents + * into {@code builder}. + */ + public static void merge(final CharSequence input, + final Message.Builder builder) + throws ParseException { + PARSER.merge(input, builder); + } + + /** + * Parse a text-format message from {@code input}. + * + * @return the parsed message, guaranteed initialized + */ + public static <T extends Message> T parse(final CharSequence input, + final Class<T> protoClass) + throws ParseException { + Message.Builder builder = + Internal.getDefaultInstance(protoClass).newBuilderForType(); + merge(input, builder); + @SuppressWarnings("unchecked") + T output = (T) builder.build(); + return output; + } + + /** + * Parse a text-format message from {@code input} and merge the contents + * into {@code builder}. Extensions will be recognized if they are + * registered in {@code extensionRegistry}. + */ + public static void merge(final Readable input, + final ExtensionRegistry extensionRegistry, + final Message.Builder builder) + throws IOException { + PARSER.merge(input, extensionRegistry, builder); + } + + + /** + * Parse a text-format message from {@code input} and merge the contents + * into {@code builder}. Extensions will be recognized if they are + * registered in {@code extensionRegistry}. + */ + public static void merge(final CharSequence input, + final ExtensionRegistry extensionRegistry, + final Message.Builder builder) + throws ParseException { + PARSER.merge(input, extensionRegistry, builder); + } + + /** + * Parse a text-format message from {@code input}. Extensions will be + * recognized if they are registered in {@code extensionRegistry}. + * + * @return the parsed message, guaranteed initialized + */ + public static <T extends Message> T parse( + final CharSequence input, + final ExtensionRegistry extensionRegistry, + final Class<T> protoClass) + throws ParseException { + Message.Builder builder = + Internal.getDefaultInstance(protoClass).newBuilderForType(); + merge(input, extensionRegistry, builder); + @SuppressWarnings("unchecked") + T output = (T) builder.build(); + return output; + } + + + /** + * Parser for text-format proto2 instances. This class is thread-safe. + * The implementation largely follows google/protobuf/text_format.cc. + * + * <p>Use {@link TextFormat#getParser()} to obtain the default parser, or + * {@link Builder} to control the parser behavior. + */ + public static class Parser { + /** + * Determines if repeated values for non-repeated fields and + * oneofs are permitted. For example, given required/optional field "foo" + * and a oneof containing "baz" and "qux": + * <ul> + * <li>"foo: 1 foo: 2" + * <li>"baz: 1 qux: 2" + * <li>merging "foo: 2" into a proto in which foo is already set, or + * <li>merging "qux: 2" into a proto in which baz is already set. + * </ul> + */ + public enum SingularOverwritePolicy { + /** The last value is retained. */ + ALLOW_SINGULAR_OVERWRITES, + /** An error is issued. */ + FORBID_SINGULAR_OVERWRITES + } + + private final boolean allowUnknownFields; + private final boolean allowUnknownEnumValues; + private final SingularOverwritePolicy singularOverwritePolicy; + private TextFormatParseInfoTree.Builder parseInfoTreeBuilder; + + private Parser( + boolean allowUnknownFields, + boolean allowUnknownEnumValues, + SingularOverwritePolicy singularOverwritePolicy, + TextFormatParseInfoTree.Builder parseInfoTreeBuilder) { + this.allowUnknownFields = allowUnknownFields; + this.allowUnknownEnumValues = allowUnknownEnumValues; + this.singularOverwritePolicy = singularOverwritePolicy; + this.parseInfoTreeBuilder = parseInfoTreeBuilder; + } + + /** + * Returns a new instance of {@link Builder}. + */ + public static Builder newBuilder() { + return new Builder(); + } + + /** + * Builder that can be used to obtain new instances of {@link Parser}. + */ + public static class Builder { + private boolean allowUnknownFields = false; + private boolean allowUnknownEnumValues = false; + private SingularOverwritePolicy singularOverwritePolicy = + SingularOverwritePolicy.ALLOW_SINGULAR_OVERWRITES; + private TextFormatParseInfoTree.Builder parseInfoTreeBuilder = null; + + + /** + * Sets parser behavior when a non-repeated field appears more than once. + */ + public Builder setSingularOverwritePolicy(SingularOverwritePolicy p) { + this.singularOverwritePolicy = p; + return this; + } + + public Builder setParseInfoTreeBuilder( + TextFormatParseInfoTree.Builder parseInfoTreeBuilder) { + this.parseInfoTreeBuilder = parseInfoTreeBuilder; + return this; + } + + public Parser build() { + return new Parser( + allowUnknownFields, + allowUnknownEnumValues, + singularOverwritePolicy, + parseInfoTreeBuilder); + } + } + + /** + * Parse a text-format message from {@code input} and merge the contents + * into {@code builder}. + */ + public void merge(final Readable input, + final Message.Builder builder) + throws IOException { + merge(input, ExtensionRegistry.getEmptyRegistry(), builder); + } + + /** + * Parse a text-format message from {@code input} and merge the contents + * into {@code builder}. + */ + public void merge(final CharSequence input, + final Message.Builder builder) + throws ParseException { + merge(input, ExtensionRegistry.getEmptyRegistry(), builder); + } + + /** + * Parse a text-format message from {@code input} and merge the contents + * into {@code builder}. Extensions will be recognized if they are + * registered in {@code extensionRegistry}. + */ + public void merge(final Readable input, + final ExtensionRegistry extensionRegistry, + final Message.Builder builder) + throws IOException { + // Read the entire input to a String then parse that. + + // If StreamTokenizer were not quite so crippled, or if there were a kind + // of Reader that could read in chunks that match some particular regex, + // or if we wanted to write a custom Reader to tokenize our stream, then + // we would not have to read to one big String. Alas, none of these is + // the case. Oh well. + + merge(toStringBuilder(input), extensionRegistry, builder); + } + + + private static final int BUFFER_SIZE = 4096; + + // TODO(chrisn): See if working around java.io.Reader#read(CharBuffer) + // overhead is worthwhile + private static StringBuilder toStringBuilder(final Readable input) + throws IOException { + final StringBuilder text = new StringBuilder(); + final CharBuffer buffer = CharBuffer.allocate(BUFFER_SIZE); + while (true) { + final int n = input.read(buffer); + if (n == -1) { + break; + } + buffer.flip(); + text.append(buffer, 0, n); + } + return text; + } + + // Check both unknown fields and unknown extensions and log warning messages + // or throw exceptions according to the flag. + private void checkUnknownFields(final List<String> unknownFields) + throws ParseException { + if (unknownFields.isEmpty()) { + return; + } + + StringBuilder msg = new StringBuilder("Input contains unknown fields and/or extensions:"); + for (String field : unknownFields) { + msg.append('\n').append(field); + } + + if (allowUnknownFields) { + logger.warning(msg.toString()); + } else { + String[] lineColumn = unknownFields.get(0).split(":"); + throw new ParseException(Integer.valueOf(lineColumn[0]), + Integer.valueOf(lineColumn[1]), msg.toString()); + } + } + + /** + * Parse a text-format message from {@code input} and merge the contents + * into {@code builder}. Extensions will be recognized if they are + * registered in {@code extensionRegistry}. + */ + public void merge(final CharSequence input, + final ExtensionRegistry extensionRegistry, + final Message.Builder builder) + throws ParseException { + final Tokenizer tokenizer = new Tokenizer(input); + MessageReflection.BuilderAdapter target = + new MessageReflection.BuilderAdapter(builder); + + List<String> unknownFields = new ArrayList<String>(); + + while (!tokenizer.atEnd()) { + mergeField(tokenizer, extensionRegistry, target, unknownFields); + } + + checkUnknownFields(unknownFields); + } + + + /** + * Parse a single field from {@code tokenizer} and merge it into + * {@code builder}. + */ + private void mergeField(final Tokenizer tokenizer, + final ExtensionRegistry extensionRegistry, + final MessageReflection.MergeTarget target, + List<String> unknownFields) + throws ParseException { + mergeField(tokenizer, extensionRegistry, target, parseInfoTreeBuilder, + unknownFields); + } + + /** + * Parse a single field from {@code tokenizer} and merge it into + * {@code target}. + */ + private void mergeField(final Tokenizer tokenizer, + final ExtensionRegistry extensionRegistry, + final MessageReflection.MergeTarget target, + TextFormatParseInfoTree.Builder parseTreeBuilder, + List<String> unknownFields) + throws ParseException { + FieldDescriptor field = null; + int startLine = tokenizer.getLine(); + int startColumn = tokenizer.getColumn(); + final Descriptor type = target.getDescriptorForType(); + ExtensionRegistry.ExtensionInfo extension = null; + + if (tokenizer.tryConsume("[")) { + // An extension. + final StringBuilder name = + new StringBuilder(tokenizer.consumeIdentifier()); + while (tokenizer.tryConsume(".")) { + name.append('.'); + name.append(tokenizer.consumeIdentifier()); + } + + extension = target.findExtensionByName( + extensionRegistry, name.toString()); + + if (extension == null) { + unknownFields.add( + (tokenizer.getPreviousLine() + 1) + + ":" + + (tokenizer.getPreviousColumn() + 1) + + ":\t" + + type.getFullName() + + ".[" + + name + + "]"); + } else { + if (extension.descriptor.getContainingType() != type) { + throw tokenizer.parseExceptionPreviousToken( + "Extension \"" + name + "\" does not extend message type \"" + + type.getFullName() + "\"."); + } + field = extension.descriptor; + } + + tokenizer.consume("]"); + } else { + final String name = tokenizer.consumeIdentifier(); + field = type.findFieldByName(name); + + // Group names are expected to be capitalized as they appear in the + // .proto file, which actually matches their type names, not their field + // names. + if (field == null) { + // Explicitly specify US locale so that this code does not break when + // executing in Turkey. + final String lowerName = name.toLowerCase(Locale.US); + field = type.findFieldByName(lowerName); + // If the case-insensitive match worked but the field is NOT a group, + if (field != null && field.getType() != FieldDescriptor.Type.GROUP) { + field = null; + } + } + // Again, special-case group names as described above. + if (field != null && field.getType() == FieldDescriptor.Type.GROUP + && !field.getMessageType().getName().equals(name)) { + field = null; + } + + if (field == null) { + unknownFields.add( + (tokenizer.getPreviousLine() + 1) + + ":" + + (tokenizer.getPreviousColumn() + 1) + + ":\t" + + type.getFullName() + + "." + + name); + } + } + + // Skips unknown fields. + if (field == null) { + // Try to guess the type of this field. + // If this field is not a message, there should be a ":" between the + // field name and the field value and also the field value should not + // start with "{" or "<" which indicates the beginning of a message body. + // If there is no ":" or there is a "{" or "<" after ":", this field has + // to be a message or the input is ill-formed. + if (tokenizer.tryConsume(":") + && !tokenizer.lookingAt("{") + && !tokenizer.lookingAt("<")) { + skipFieldValue(tokenizer); + } else { + skipFieldMessage(tokenizer); + } + return; + } + + // Handle potential ':'. + if (field.getJavaType() == FieldDescriptor.JavaType.MESSAGE) { + tokenizer.tryConsume(":"); // optional + if (parseTreeBuilder != null) { + TextFormatParseInfoTree.Builder childParseTreeBuilder = + parseTreeBuilder.getBuilderForSubMessageField(field); + consumeFieldValues(tokenizer, extensionRegistry, target, field, extension, + childParseTreeBuilder, unknownFields); + } else { + consumeFieldValues(tokenizer, extensionRegistry, target, field, extension, + parseTreeBuilder, unknownFields); + } + } else { + tokenizer.consume(":"); // required + consumeFieldValues(tokenizer, extensionRegistry, target, field, + extension, parseTreeBuilder, unknownFields); + } + + if (parseTreeBuilder != null) { + parseTreeBuilder.setLocation( + field, TextFormatParseLocation.create(startLine, startColumn)); + } + + // For historical reasons, fields may optionally be separated by commas or + // semicolons. + if (!tokenizer.tryConsume(";")) { + tokenizer.tryConsume(","); + } + } + + /** + * Parse a one or more field values from {@code tokenizer} and merge it into + * {@code builder}. + */ + private void consumeFieldValues( + final Tokenizer tokenizer, + final ExtensionRegistry extensionRegistry, + final MessageReflection.MergeTarget target, + final FieldDescriptor field, + final ExtensionRegistry.ExtensionInfo extension, + final TextFormatParseInfoTree.Builder parseTreeBuilder, + List<String> unknownFields) + throws ParseException { + // Support specifying repeated field values as a comma-separated list. + // Ex."foo: [1, 2, 3]" + if (field.isRepeated() && tokenizer.tryConsume("[")) { + if (!tokenizer.tryConsume("]")) { // Allow "foo: []" to be treated as empty. + while (true) { + consumeFieldValue( + tokenizer, + extensionRegistry, + target, + field, + extension, + parseTreeBuilder, + unknownFields); + if (tokenizer.tryConsume("]")) { + // End of list. + break; + } + tokenizer.consume(","); + } + } + } else { + consumeFieldValue(tokenizer, extensionRegistry, target, field, + extension, parseTreeBuilder, unknownFields); + } + } + + /** + * Parse a single field value from {@code tokenizer} and merge it into + * {@code builder}. + */ + private void consumeFieldValue( + final Tokenizer tokenizer, + final ExtensionRegistry extensionRegistry, + final MessageReflection.MergeTarget target, + final FieldDescriptor field, + final ExtensionRegistry.ExtensionInfo extension, + final TextFormatParseInfoTree.Builder parseTreeBuilder, + List<String> unknownFields) + throws ParseException { + Object value = null; + + if (field.getJavaType() == FieldDescriptor.JavaType.MESSAGE) { + final String endToken; + if (tokenizer.tryConsume("<")) { + endToken = ">"; + } else { + tokenizer.consume("{"); + endToken = "}"; + } + + final MessageReflection.MergeTarget subField; + subField = target.newMergeTargetForField(field, + (extension == null) ? null : extension.defaultInstance); + + while (!tokenizer.tryConsume(endToken)) { + if (tokenizer.atEnd()) { + throw tokenizer.parseException( + "Expected \"" + endToken + "\"."); + } + mergeField(tokenizer, extensionRegistry, subField, parseTreeBuilder, + unknownFields); + } + + value = subField.finish(); + + } else { + switch (field.getType()) { + case INT32: + case SINT32: + case SFIXED32: + value = tokenizer.consumeInt32(); + break; + + case INT64: + case SINT64: + case SFIXED64: + value = tokenizer.consumeInt64(); + break; + + case UINT32: + case FIXED32: + value = tokenizer.consumeUInt32(); + break; + + case UINT64: + case FIXED64: + value = tokenizer.consumeUInt64(); + break; + + case FLOAT: + value = tokenizer.consumeFloat(); + break; + + case DOUBLE: + value = tokenizer.consumeDouble(); + break; + + case BOOL: + value = tokenizer.consumeBoolean(); + break; + + case STRING: + value = tokenizer.consumeString(); + break; + + case BYTES: + value = tokenizer.consumeByteString(); + break; + + case ENUM: + final EnumDescriptor enumType = field.getEnumType(); + + if (tokenizer.lookingAtInteger()) { + final int number = tokenizer.consumeInt32(); + value = enumType.findValueByNumber(number); + if (value == null) { + String unknownValueMsg = + "Enum type \"" + + enumType.getFullName() + + "\" has no value with number " + + number + + '.'; + if (allowUnknownEnumValues) { + logger.warning(unknownValueMsg); + return; + } else { + throw tokenizer.parseExceptionPreviousToken( + "Enum type \"" + + enumType.getFullName() + + "\" has no value with number " + + number + + '.'); + } + } + } else { + final String id = tokenizer.consumeIdentifier(); + value = enumType.findValueByName(id); + if (value == null) { + String unknownValueMsg = + "Enum type \"" + + enumType.getFullName() + + "\" has no value named \"" + + id + + "\"."; + if (allowUnknownEnumValues) { + logger.warning(unknownValueMsg); + return; + } else { + throw tokenizer.parseExceptionPreviousToken(unknownValueMsg); + } + } + } + + break; + + case MESSAGE: + case GROUP: + throw new RuntimeException("Can't get here."); + } + } + + if (field.isRepeated()) { + // TODO(b/29122459): If field.isMapField() and FORBID_SINGULAR_OVERWRITES mode, + // check for duplicate map keys here. + target.addRepeatedField(field, value); + } else if ((singularOverwritePolicy + == SingularOverwritePolicy.FORBID_SINGULAR_OVERWRITES) + && target.hasField(field)) { + throw tokenizer.parseExceptionPreviousToken("Non-repeated field \"" + + field.getFullName() + "\" cannot be overwritten."); + } else if ((singularOverwritePolicy + == SingularOverwritePolicy.FORBID_SINGULAR_OVERWRITES) + && field.getContainingOneof() != null + && target.hasOneof(field.getContainingOneof())) { + Descriptors.OneofDescriptor oneof = field.getContainingOneof(); + throw tokenizer.parseExceptionPreviousToken("Field \"" + + field.getFullName() + "\" is specified along with field \"" + + target.getOneofFieldDescriptor(oneof).getFullName() + + "\", another member of oneof \"" + oneof.getName() + "\"."); + } else { + target.setField(field, value); + } + } + + /** + * Skips the next field including the field's name and value. + */ + private void skipField(Tokenizer tokenizer) throws ParseException { + if (tokenizer.tryConsume("[")) { + // Extension name. + do { + tokenizer.consumeIdentifier(); + } while (tokenizer.tryConsume(".")); + tokenizer.consume("]"); + } else { + tokenizer.consumeIdentifier(); + } + + // Try to guess the type of this field. + // If this field is not a message, there should be a ":" between the + // field name and the field value and also the field value should not + // start with "{" or "<" which indicates the beginning of a message body. + // If there is no ":" or there is a "{" or "<" after ":", this field has + // to be a message or the input is ill-formed. + if (tokenizer.tryConsume(":") + && !tokenizer.lookingAt("<") + && !tokenizer.lookingAt("{")) { + skipFieldValue(tokenizer); + } else { + skipFieldMessage(tokenizer); + } + // For historical reasons, fields may optionally be separated by commas or + // semicolons. + if (!tokenizer.tryConsume(";")) { + tokenizer.tryConsume(","); + } + } + + /** + * Skips the whole body of a message including the beginning delimiter and + * the ending delimiter. + */ + private void skipFieldMessage(Tokenizer tokenizer) throws ParseException { + final String delimiter; + if (tokenizer.tryConsume("<")) { + delimiter = ">"; + } else { + tokenizer.consume("{"); + delimiter = "}"; + } + while (!tokenizer.lookingAt(">") && !tokenizer.lookingAt("}")) { + skipField(tokenizer); + } + tokenizer.consume(delimiter); + } + + /** + * Skips a field value. + */ + private void skipFieldValue(Tokenizer tokenizer) throws ParseException { + if (tokenizer.tryConsumeString()) { + while (tokenizer.tryConsumeString()) {} + return; + } + if (!tokenizer.tryConsumeIdentifier() // includes enum & boolean + && !tokenizer.tryConsumeInt64() // includes int32 + && !tokenizer.tryConsumeUInt64() // includes uint32 + && !tokenizer.tryConsumeDouble() + && !tokenizer.tryConsumeFloat()) { + throw tokenizer.parseException( + "Invalid field value: " + tokenizer.currentToken); + } + } + } + + // ================================================================= + // Utility functions + // + // Some of these methods are package-private because Descriptors.java uses + // them. + + /** + * Escapes bytes in the format used in protocol buffer text format, which + * is the same as the format used for C string literals. All bytes + * that are not printable 7-bit ASCII characters are escaped, as well as + * backslash, single-quote, and double-quote characters. Characters for + * which no defined short-hand escape sequence is defined will be escaped + * using 3-digit octal sequences. + */ + public static String escapeBytes(ByteString input) { + return TextFormatEscaper.escapeBytes(input); + } + + /** + * Like {@link #escapeBytes(ByteString)}, but used for byte array. + */ + public static String escapeBytes(byte[] input) { + return TextFormatEscaper.escapeBytes(input); + } + + /** + * Un-escape a byte sequence as escaped using + * {@link #escapeBytes(ByteString)}. Two-digit hex escapes (starting with + * "\x") are also recognized. + */ + public static ByteString unescapeBytes(final CharSequence charString) + throws InvalidEscapeSequenceException { + // First convert the Java character sequence to UTF-8 bytes. + ByteString input = ByteString.copyFromUtf8(charString.toString()); + // Then unescape certain byte sequences introduced by ASCII '\\'. The valid + // escapes can all be expressed with ASCII characters, so it is safe to + // operate on bytes here. + // + // Unescaping the input byte array will result in a byte sequence that's no + // longer than the input. That's because each escape sequence is between + // two and four bytes long and stands for a single byte. + final byte[] result = new byte[input.size()]; + int pos = 0; + for (int i = 0; i < input.size(); i++) { + byte c = input.byteAt(i); + if (c == '\\') { + if (i + 1 < input.size()) { + ++i; + c = input.byteAt(i); + if (isOctal(c)) { + // Octal escape. + int code = digitValue(c); + if (i + 1 < input.size() && isOctal(input.byteAt(i + 1))) { + ++i; + code = code * 8 + digitValue(input.byteAt(i)); + } + if (i + 1 < input.size() && isOctal(input.byteAt(i + 1))) { + ++i; + code = code * 8 + digitValue(input.byteAt(i)); + } + // TODO: Check that 0 <= code && code <= 0xFF. + result[pos++] = (byte) code; + } else { + switch (c) { + case 'a' : result[pos++] = 0x07; break; + case 'b' : result[pos++] = '\b'; break; + case 'f' : result[pos++] = '\f'; break; + case 'n' : result[pos++] = '\n'; break; + case 'r' : result[pos++] = '\r'; break; + case 't' : result[pos++] = '\t'; break; + case 'v' : result[pos++] = 0x0b; break; + case '\\': result[pos++] = '\\'; break; + case '\'': result[pos++] = '\''; break; + case '"' : result[pos++] = '\"'; break; + + case 'x': + // hex escape + int code = 0; + if (i + 1 < input.size() && isHex(input.byteAt(i + 1))) { + ++i; + code = digitValue(input.byteAt(i)); + } else { + throw new InvalidEscapeSequenceException( + "Invalid escape sequence: '\\x' with no digits"); + } + if (i + 1 < input.size() && isHex(input.byteAt(i + 1))) { + ++i; + code = code * 16 + digitValue(input.byteAt(i)); + } + result[pos++] = (byte) code; + break; + + default: + throw new InvalidEscapeSequenceException( + "Invalid escape sequence: '\\" + (char) c + '\''); + } + } + } else { + throw new InvalidEscapeSequenceException( + "Invalid escape sequence: '\\' at end of string."); + } + } else { + result[pos++] = c; + } + } + + return result.length == pos + ? ByteString.wrap(result) // This reference has not been out of our control. + : ByteString.copyFrom(result, 0, pos); + } + + /** + * Thrown by {@link TextFormat#unescapeBytes} and + * {@link TextFormat#unescapeText} when an invalid escape sequence is seen. + */ + public static class InvalidEscapeSequenceException extends IOException { + private static final long serialVersionUID = -8164033650142593304L; + + InvalidEscapeSequenceException(final String description) { + super(description); + } + } + + /** + * Like {@link #escapeBytes(ByteString)}, but escapes a text string. + * Non-ASCII characters are first encoded as UTF-8, then each byte is escaped + * individually as a 3-digit octal escape. Yes, it's weird. + */ + static String escapeText(final String input) { + return escapeBytes(ByteString.copyFromUtf8(input)); + } + + /** + * Escape double quotes and backslashes in a String for unicode output of a message. + */ + public static String escapeDoubleQuotesAndBackslashes(final String input) { + return TextFormatEscaper.escapeDoubleQuotesAndBackslashes(input); + } + + /** + * Un-escape a text string as escaped using {@link #escapeText(String)}. + * Two-digit hex escapes (starting with "\x") are also recognized. + */ + static String unescapeText(final String input) + throws InvalidEscapeSequenceException { + return unescapeBytes(input).toStringUtf8(); + } + + /** Is this an octal digit? */ + private static boolean isOctal(final byte c) { + return '0' <= c && c <= '7'; + } + + /** Is this a hex digit? */ + private static boolean isHex(final byte c) { + return ('0' <= c && c <= '9') + || ('a' <= c && c <= 'f') + || ('A' <= c && c <= 'F'); + } + + /** + * Interpret a character as a digit (in any base up to 36) and return the + * numeric value. This is like {@code Character.digit()} but we don't accept + * non-ASCII digits. + */ + private static int digitValue(final byte c) { + if ('0' <= c && c <= '9') { + return c - '0'; + } else if ('a' <= c && c <= 'z') { + return c - 'a' + 10; + } else { + return c - 'A' + 10; + } + } + + /** + * Parse a 32-bit signed integer from the text. Unlike the Java standard + * {@code Integer.parseInt()}, this function recognizes the prefixes "0x" + * and "0" to signify hexadecimal and octal numbers, respectively. + */ + static int parseInt32(final String text) throws NumberFormatException { + return (int) parseInteger(text, true, false); + } + + /** + * Parse a 32-bit unsigned integer from the text. Unlike the Java standard + * {@code Integer.parseInt()}, this function recognizes the prefixes "0x" + * and "0" to signify hexadecimal and octal numbers, respectively. The + * result is coerced to a (signed) {@code int} when returned since Java has + * no unsigned integer type. + */ + static int parseUInt32(final String text) throws NumberFormatException { + return (int) parseInteger(text, false, false); + } + + /** + * Parse a 64-bit signed integer from the text. Unlike the Java standard + * {@code Integer.parseInt()}, this function recognizes the prefixes "0x" + * and "0" to signify hexadecimal and octal numbers, respectively. + */ + static long parseInt64(final String text) throws NumberFormatException { + return parseInteger(text, true, true); + } + + /** + * Parse a 64-bit unsigned integer from the text. Unlike the Java standard + * {@code Integer.parseInt()}, this function recognizes the prefixes "0x" + * and "0" to signify hexadecimal and octal numbers, respectively. The + * result is coerced to a (signed) {@code long} when returned since Java has + * no unsigned long type. + */ + static long parseUInt64(final String text) throws NumberFormatException { + return parseInteger(text, false, true); + } + + private static long parseInteger(final String text, + final boolean isSigned, + final boolean isLong) + throws NumberFormatException { + int pos = 0; + + boolean negative = false; + if (text.startsWith("-", pos)) { + if (!isSigned) { + throw new NumberFormatException("Number must be positive: " + text); + } + ++pos; + negative = true; + } + + int radix = 10; + if (text.startsWith("0x", pos)) { + pos += 2; + radix = 16; + } else if (text.startsWith("0", pos)) { + radix = 8; + } + + final String numberText = text.substring(pos); + + long result = 0; + if (numberText.length() < 16) { + // Can safely assume no overflow. + result = Long.parseLong(numberText, radix); + if (negative) { + result = -result; + } + + // Check bounds. + // No need to check for 64-bit numbers since they'd have to be 16 chars + // or longer to overflow. + if (!isLong) { + if (isSigned) { + if (result > Integer.MAX_VALUE || result < Integer.MIN_VALUE) { + throw new NumberFormatException( + "Number out of range for 32-bit signed integer: " + text); + } + } else { + if (result >= (1L << 32) || result < 0) { + throw new NumberFormatException( + "Number out of range for 32-bit unsigned integer: " + text); + } + } + } + } else { + BigInteger bigValue = new BigInteger(numberText, radix); + if (negative) { + bigValue = bigValue.negate(); + } + + // Check bounds. + if (!isLong) { + if (isSigned) { + if (bigValue.bitLength() > 31) { + throw new NumberFormatException( + "Number out of range for 32-bit signed integer: " + text); + } + } else { + if (bigValue.bitLength() > 32) { + throw new NumberFormatException( + "Number out of range for 32-bit unsigned integer: " + text); + } + } + } else { + if (isSigned) { + if (bigValue.bitLength() > 63) { + throw new NumberFormatException( + "Number out of range for 64-bit signed integer: " + text); + } + } else { + if (bigValue.bitLength() > 64) { + throw new NumberFormatException( + "Number out of range for 64-bit unsigned integer: " + text); + } + } + } + + result = bigValue.longValue(); + } + + return result; + } +} |