Revert of [inspector] Initial import of v8_inspector.

src/inspector/String16.cpp

Index: src/inspector/String16.cpp
diff --git a/src/inspector/String16.cpp b/src/inspector/String16.cpp
deleted file mode 100644
index add02f787e3ee32a49f8a3ad65caf730bf6cc35d..0000000000000000000000000000000000000000
--- a/src/inspector/String16.cpp
+++ /dev/null
@@ -1,548 +0,0 @@
-// Copyright 2016 the V8 project authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file.
-
-#include "src/inspector/String16.h"
-
-#include "src/inspector/ProtocolPlatform.h"
-
-#include <algorithm>
-#include <cctype>
-#include <cstdio>
-#include <cstdlib>
-#include <cstring>
-#include <locale>
-#include <string>
-
-namespace v8_inspector {
-
-namespace {
-
-bool isASCII(UChar c)
-{
-    return !(c & ~0x7F);
-}
-
-bool isSpaceOrNewLine(UChar c)
-{
-    return isASCII(c) && c <= ' ' && (c == ' ' || (c <= 0xD && c >= 0x9));
-}
-
-int charactersToInteger(const UChar* characters, size_t length, bool* ok = nullptr)
-{
-    std::vector<char> buffer;
-    buffer.reserve(length + 1);
-    for (size_t i = 0; i < length; ++i) {
-        if (!isASCII(characters[i])) {
-            if (ok)
-                *ok = false;
-            return 0;
-        }
-        buffer.push_back(static_cast<char>(characters[i]));
-    }
-    buffer.push_back('\0');
-
-    char* endptr;
-    int result = std::strtol(buffer.data(), &endptr, 10);
-    if (ok)
-        *ok = !(*endptr);
-    return result;
-}
-
-const UChar replacementCharacter = 0xFFFD;
-using UChar32 = uint32_t;
-
-inline int inlineUTF8SequenceLengthNonASCII(char b0)
-{
-    if ((b0 & 0xC0) != 0xC0)
-        return 0;
-    if ((b0 & 0xE0) == 0xC0)
-        return 2;
-    if ((b0 & 0xF0) == 0xE0)
-        return 3;
-    if ((b0 & 0xF8) == 0xF0)
-        return 4;
-    return 0;
-}
-
-inline int inlineUTF8SequenceLength(char b0)
-{
-    return isASCII(b0) ? 1 : inlineUTF8SequenceLengthNonASCII(b0);
-}
-
-// Once the bits are split out into bytes of UTF-8, this is a mask OR-ed
-// into the first byte, depending on how many bytes follow.  There are
-// as many entries in this table as there are UTF-8 sequence types.
-// (I.e., one byte sequence, two byte... etc.). Remember that sequences
-// for *legal* UTF-8 will be 4 or fewer bytes total.
-static const unsigned char firstByteMark[7] = { 0x00, 0x00, 0xC0, 0xE0, 0xF0, 0xF8, 0xFC };
-
-typedef enum {
-    conversionOK, // conversion successful
-    sourceExhausted, // partial character in source, but hit end
-    targetExhausted, // insuff. room in target for conversion
-    sourceIllegal // source sequence is illegal/malformed
-} ConversionResult;
-
-ConversionResult convertUTF16ToUTF8(
-    const UChar** sourceStart, const UChar* sourceEnd,
-    char** targetStart, char* targetEnd, bool strict)
-{
-    ConversionResult result = conversionOK;
-    const UChar* source = *sourceStart;
-    char* target = *targetStart;
-    while (source < sourceEnd) {
-        UChar32 ch;
-        unsigned short bytesToWrite = 0;
-        const UChar32 byteMask = 0xBF;
-        const UChar32 byteMark = 0x80;
-        const UChar* oldSource = source; // In case we have to back up because of target overflow.
-        ch = static_cast<unsigned short>(*source++);
-        // If we have a surrogate pair, convert to UChar32 first.
-        if (ch >= 0xD800 && ch <= 0xDBFF) {
-            // If the 16 bits following the high surrogate are in the source buffer...
-            if (source < sourceEnd) {
-                UChar32 ch2 = static_cast<unsigned short>(*source);
-                // If it's a low surrogate, convert to UChar32.
-                if (ch2 >= 0xDC00 && ch2 <= 0xDFFF) {
-                    ch = ((ch - 0xD800) << 10) + (ch2 - 0xDC00) + 0x0010000;
-                    ++source;
-                } else if (strict) { // it's an unpaired high surrogate
-                    --source; // return to the illegal value itself
-                    result = sourceIllegal;
-                    break;
-                }
-            } else { // We don't have the 16 bits following the high surrogate.
-                --source; // return to the high surrogate
-                result = sourceExhausted;
-                break;
-            }
-        } else if (strict) {
-            // UTF-16 surrogate values are illegal in UTF-32
-            if (ch >= 0xDC00 && ch <= 0xDFFF) {
-                --source; // return to the illegal value itself
-                result = sourceIllegal;
-                break;
-            }
-        }
-        // Figure out how many bytes the result will require
-        if (ch < (UChar32)0x80) {
-            bytesToWrite = 1;
-        } else if (ch < (UChar32)0x800) {
-            bytesToWrite = 2;
-        } else if (ch < (UChar32)0x10000) {
-            bytesToWrite = 3;
-        } else if (ch < (UChar32)0x110000) {
-            bytesToWrite = 4;
-        } else {
-            bytesToWrite = 3;
-            ch = replacementCharacter;
-        }
-
-        target += bytesToWrite;
-        if (target > targetEnd) {
-            source = oldSource; // Back up source pointer!
-            target -= bytesToWrite;
-            result = targetExhausted;
-            break;
-        }
-        switch (bytesToWrite) { // note: everything falls through.
-        case 4:
-            *--target = (char)((ch | byteMark) & byteMask);
-            ch >>= 6;
-        case 3:
-            *--target = (char)((ch | byteMark) & byteMask);
-            ch >>= 6;
-        case 2:
-            *--target = (char)((ch | byteMark) & byteMask);
-            ch >>= 6;
-        case 1:
-            *--target =  (char)(ch | firstByteMark[bytesToWrite]);
-        }
-        target += bytesToWrite;
-    }
-    *sourceStart = source;
-    *targetStart = target;
-    return result;
-}
-
-/**
- * Is this code point a BMP code point (U+0000..U+ffff)?
- * @param c 32-bit code point
- * @return TRUE or FALSE
- * @stable ICU 2.8
- */
-#define U_IS_BMP(c) ((uint32_t)(c) <= 0xffff)
-
-/**
- * Is this code point a supplementary code point (U+10000..U+10ffff)?
- * @param c 32-bit code point
- * @return TRUE or FALSE
- * @stable ICU 2.8
- */
-#define U_IS_SUPPLEMENTARY(c) ((uint32_t)((c) - 0x10000) <= 0xfffff)
-
-/**
- * Is this code point a surrogate (U+d800..U+dfff)?
- * @param c 32-bit code point
- * @return TRUE or FALSE
- * @stable ICU 2.4
- */
-#define U_IS_SURROGATE(c) (((c) & 0xfffff800) == 0xd800)
-
-/**
- * Get the lead surrogate (0xd800..0xdbff) for a
- * supplementary code point (0x10000..0x10ffff).
- * @param supplementary 32-bit code point (U+10000..U+10ffff)
- * @return lead surrogate (U+d800..U+dbff) for supplementary
- * @stable ICU 2.4
- */
-#define U16_LEAD(supplementary) (UChar)(((supplementary) >> 10) + 0xd7c0)
-
-/**
- * Get the trail surrogate (0xdc00..0xdfff) for a
- * supplementary code point (0x10000..0x10ffff).
- * @param supplementary 32-bit code point (U+10000..U+10ffff)
- * @return trail surrogate (U+dc00..U+dfff) for supplementary
- * @stable ICU 2.4
- */
-#define U16_TRAIL(supplementary) (UChar)(((supplementary) & 0x3ff) | 0xdc00)
-
-// This must be called with the length pre-determined by the first byte.
-// If presented with a length > 4, this returns false.  The Unicode
-// definition of UTF-8 goes up to 4-byte sequences.
-static bool isLegalUTF8(const unsigned char* source, int length)
-{
-    unsigned char a;
-    const unsigned char* srcptr = source + length;
-    switch (length) {
-    default:
-        return false;
-    // Everything else falls through when "true"...
-    case 4:
-        if ((a = (*--srcptr)) < 0x80 || a > 0xBF)
-            return false;
-    case 3:
-        if ((a = (*--srcptr)) < 0x80 || a > 0xBF)
-            return false;
-    case 2:
-        if ((a = (*--srcptr)) > 0xBF)
-            return false;
-
-        // no fall-through in this inner switch
-        switch (*source) {
-        case 0xE0:
-            if (a < 0xA0)
-                return false;
-            break;
-        case 0xED:
-            if (a > 0x9F)
-                return false;
-            break;
-        case 0xF0:
-            if (a < 0x90)
-                return false;
-            break;
-        case 0xF4:
-            if (a > 0x8F)
-                return false;
-            break;
-        default:
-            if (a < 0x80)
-                return false;
-        }
-
-    case 1:
-        if (*source >= 0x80 && *source < 0xC2)
-            return false;
-    }
-    if (*source > 0xF4)
-        return false;
-    return true;
-}
-
-// Magic values subtracted from a buffer value during UTF8 conversion.
-// This table contains as many values as there might be trailing bytes
-// in a UTF-8 sequence.
-static const UChar32 offsetsFromUTF8[6] = { 0x00000000UL, 0x00003080UL, 0x000E2080UL, 0x03C82080UL, static_cast<UChar32>(0xFA082080UL), static_cast<UChar32>(0x82082080UL) };
-
-static inline UChar32 readUTF8Sequence(const char*& sequence, unsigned length)
-{
-    UChar32 character = 0;
-
-    // The cases all fall through.
-    switch (length) {
-    case 6:
-        character += static_cast<unsigned char>(*sequence++);
-        character <<= 6;
-    case 5:
-        character += static_cast<unsigned char>(*sequence++);
-        character <<= 6;
-    case 4:
-        character += static_cast<unsigned char>(*sequence++);
-        character <<= 6;
-    case 3:
-        character += static_cast<unsigned char>(*sequence++);
-        character <<= 6;
-    case 2:
-        character += static_cast<unsigned char>(*sequence++);
-        character <<= 6;
-    case 1:
-        character += static_cast<unsigned char>(*sequence++);
-    }
-
-    return character - offsetsFromUTF8[length - 1];
-}
-
-ConversionResult convertUTF8ToUTF16(
-    const char** sourceStart, const char* sourceEnd,
-    UChar** targetStart, UChar* targetEnd, bool* sourceAllASCII, bool strict)
-{
-    ConversionResult result = conversionOK;
-    const char* source = *sourceStart;
-    UChar* target = *targetStart;
-    UChar orAllData = 0;
-    while (source < sourceEnd) {
-        int utf8SequenceLength = inlineUTF8SequenceLength(*source);
-        if (sourceEnd - source < utf8SequenceLength)  {
-            result = sourceExhausted;
-            break;
-        }
-        // Do this check whether lenient or strict
-        if (!isLegalUTF8(reinterpret_cast<const unsigned char*>(source), utf8SequenceLength)) {
-            result = sourceIllegal;
-            break;
-        }
-
-        UChar32 character = readUTF8Sequence(source, utf8SequenceLength);
-
-        if (target >= targetEnd) {
-            source -= utf8SequenceLength; // Back up source pointer!
-            result = targetExhausted;
-            break;
-        }
-
-        if (U_IS_BMP(character)) {
-            // UTF-16 surrogate values are illegal in UTF-32
-            if (U_IS_SURROGATE(character)) {
-                if (strict) {
-                    source -= utf8SequenceLength; // return to the illegal value itself
-                    result = sourceIllegal;
-                    break;
-                }
-                *target++ = replacementCharacter;
-                orAllData |= replacementCharacter;
-            } else {
-                *target++ = static_cast<UChar>(character); // normal case
-                orAllData |= character;
-            }
-        } else if (U_IS_SUPPLEMENTARY(character)) {
-            // target is a character in range 0xFFFF - 0x10FFFF
-            if (target + 1 >= targetEnd) {
-                source -= utf8SequenceLength; // Back up source pointer!
-                result = targetExhausted;
-                break;
-            }
-            *target++ = U16_LEAD(character);
-            *target++ = U16_TRAIL(character);
-            orAllData = 0xffff;
-        } else {
-            if (strict) {
-                source -= utf8SequenceLength; // return to the start
-                result = sourceIllegal;
-                break; // Bail out; shouldn't continue
-            } else {
-                *target++ = replacementCharacter;
-                orAllData |= replacementCharacter;
-            }
-        }
-    }
-    *sourceStart = source;
-    *targetStart = target;
-
-    if (sourceAllASCII)
-        *sourceAllASCII = !(orAllData & ~0x7f);
-
-    return result;
-}
-
-// Helper to write a three-byte UTF-8 code point to the buffer, caller must check room is available.
-static inline void putUTF8Triple(char*& buffer, UChar ch)
-{
-    *buffer++ = static_cast<char>(((ch >> 12) & 0x0F) | 0xE0);
-    *buffer++ = static_cast<char>(((ch >> 6) & 0x3F) | 0x80);
-    *buffer++ = static_cast<char>((ch & 0x3F) | 0x80);
-}
-
-} // namespace
-
-// static
-String16 String16::fromInteger(int number)
-{
-    const size_t kBufferSize = 50;
-    char buffer[kBufferSize];
-    std::snprintf(buffer, kBufferSize, "%d", number);
-    return String16(buffer);
-}
-
-// static
-String16 String16::fromDouble(double number)
-{
-    const size_t kBufferSize = 100;
-    char buffer[kBufferSize];
-    std::snprintf(buffer, kBufferSize, "%f", number);
-    return String16(buffer);
-}
-
-// static
-String16 String16::fromDoublePrecision3(double number)
-{
-    const size_t kBufferSize = 100;
-    char buffer[kBufferSize];
-    std::snprintf(buffer, kBufferSize, "%.3g", number);
-    return String16(buffer);
-}
-
-// static
-String16 String16::fromDoublePrecision6(double number)
-{
-    const size_t kBufferSize = 100;
-    char buffer[kBufferSize];
-    std::snprintf(buffer, kBufferSize, "%.6g", number);
-    return String16(buffer);
-}
-
-int String16::toInteger(bool* ok) const
-{
-    return charactersToInteger(characters16(), length(), ok);
-}
-
-String16 String16::stripWhiteSpace() const
-{
-    if (!length())
-        return String16();
-
-    unsigned start = 0;
-    unsigned end = length() - 1;
-
-    // skip white space from start
-    while (start <= end && isSpaceOrNewLine(characters16()[start]))
-        ++start;
-
-    // only white space
-    if (start > end)
-        return String16();
-
-    // skip white space from end
-    while (end && isSpaceOrNewLine(characters16()[end]))
-        --end;
-
-    if (!start && end == length() - 1)
-        return *this;
-    return String16(characters16() + start, end + 1 - start);
-}
-
-String16Builder::String16Builder()
-{
-}
-
-void String16Builder::append(const String16& s)
-{
-    m_buffer.insert(m_buffer.end(), s.characters16(), s.characters16() + s.length());
-}
-
-void String16Builder::append(UChar c)
-{
-    m_buffer.push_back(c);
-}
-
-void String16Builder::append(char c)
-{
-    UChar u = c;
-    m_buffer.push_back(u);
-}
-
-void String16Builder::append(const UChar* characters, size_t length)
-{
-    m_buffer.insert(m_buffer.end(), characters, characters + length);
-}
-
-void String16Builder::append(const char* characters, size_t length)
-{
-    m_buffer.insert(m_buffer.end(), characters, characters + length);
-}
-
-String16 String16Builder::toString()
-{
-    return String16(m_buffer.data(), m_buffer.size());
-}
-
-void String16Builder::reserveCapacity(size_t capacity)
-{
-    m_buffer.reserve(capacity);
-}
-
-String16 String16::fromUTF8(const char* stringStart, size_t length)
-{
-    if (!stringStart || !length)
-        return String16();
-
-    std::vector<UChar> buffer(length);
-    UChar* bufferStart = buffer.data();
-
-    UChar* bufferCurrent = bufferStart;
-    const char* stringCurrent = stringStart;
-    if (convertUTF8ToUTF16(&stringCurrent, stringStart + length, &bufferCurrent, bufferCurrent + buffer.size(), 0, true) != conversionOK)
-        return String16();
-
-    unsigned utf16Length = bufferCurrent - bufferStart;
-    return String16(bufferStart, utf16Length);
-}
-
-std::string String16::utf8() const
-{
-    unsigned length = this->length();
-
-    if (!length)
-        return std::string("");
-
-    // Allocate a buffer big enough to hold all the characters
-    // (an individual UTF-16 UChar can only expand to 3 UTF-8 bytes).
-    // Optimization ideas, if we find this function is hot:
-    //  * We could speculatively create a CStringBuffer to contain 'length'
-    //    characters, and resize if necessary (i.e. if the buffer contains
-    //    non-ascii characters). (Alternatively, scan the buffer first for
-    //    ascii characters, so we know this will be sufficient).
-    //  * We could allocate a CStringBuffer with an appropriate size to
-    //    have a good chance of being able to write the string into the
-    //    buffer without reallocing (say, 1.5 x length).
-    if (length > std::numeric_limits<unsigned>::max() / 3)
-        return std::string();
-    std::vector<char> bufferVector(length * 3);
-    char* buffer = bufferVector.data();
-    const UChar* characters = m_impl.data();
-
-    ConversionResult result = convertUTF16ToUTF8(&characters, characters + length, &buffer, buffer + bufferVector.size(), false);
-    DCHECK(result != targetExhausted); // (length * 3) should be sufficient for any conversion
-
-    // Only produced from strict conversion.
-    DCHECK(result != sourceIllegal);
-
-    // Check for an unconverted high surrogate.
-    if (result == sourceExhausted) {
-        // This should be one unpaired high surrogate. Treat it the same
-        // was as an unpaired high surrogate would have been handled in
-        // the middle of a string with non-strict conversion - which is
-        // to say, simply encode it to UTF-8.
-        DCHECK((characters + 1) == (m_impl.data() + length));
-        DCHECK((*characters >= 0xD800) && (*characters <= 0xDBFF));
-        // There should be room left, since one UChar hasn't been
-        // converted.
-        DCHECK((buffer + 3) <= (buffer + bufferVector.size()));
-        putUTF8Triple(buffer, *characters);
-    }
-
-    return std::string(bufferVector.data(), buffer - bufferVector.data());
-}
-
-} // namespace v8_inspector