[DevTools] Reduce API surface of String16.

third_party/WebKit/Source/platform/inspector_protocol/String16.cpp

+// Copyright 2016 The Chromium 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 "platform/inspector_protocol/String16.h"
+
+#include <cstdio>
+#include <cstdlib>
+#include <cstring>
+#include <string>
+
+namespace blink {
+namespace protocol {
+
+bool isASCIISpace(UChar c)
+{
+    return c <= ' ' && (c == ' ' || (c <= 0xD && c >= 0x9));
+}
+
+bool isSpaceOrNewLine(UChar c)
+{
+    return c <= 0x7F ? isASCIISpace(c) : false;
+}
+
+String16 string16FromInteger(int number)
+{
+    static char buffer[50];
+    std::sprintf(buffer, "%d", number);
+    return String16(buffer);
+}
+
+String16 string16FromDouble(double number)
+{
+    static char buffer[100];
+    std::sprintf(buffer, "%f", number);
+    return String16(buffer);
+}
+
+String16 string16FromDoublePrecision3(double number)
+{
+    static char buffer[100];
+    std::sprintf(buffer, "%.3g", number);
+    return String16(buffer);
+}
+
+String16 string16FromDoublePrecision6(double number)
+{
+    static char buffer[100];
+    std::sprintf(buffer, "%.6g", number);
+    return String16(buffer);
+}
+
+double string16CharactersToDouble(const UChar* characters, size_t length, bool* ok)
+{
+    std::string str;
+    str.resize(length);
+    for (size_t i = 0; i < length; ++i)
+        str[i] = static_cast<char>(characters[i]);
+
+    const char* buffer = str.c_str();
+    char* endptr;
+    double result = strtod(buffer, &endptr);
+    if (ok)
+        *ok = buffer + length == endptr;
+    return result;
+}
+
+int string16CharactersToInt(const UChar* characters, size_t length, bool* ok)
+{
+    std::string str;
+    str.resize(length);
+    for (size_t i = 0; i < length; ++i)
+        str[i] = static_cast<char>(characters[i]);
+
+    const char* buffer = str.c_str();
+    char* endptr;
+    int result = strtol(buffer, &endptr, 10);
+    if (ok)
+        *ok = buffer + length == endptr;
+    return result;
+}
+
+String16 string16StripWhiteSpace(const String16& source)
+{
+    if (!source.length())
+        return String16();
+
+    unsigned start = 0;
+    unsigned end = source.length() - 1;
+
+    // skip white space from start
+    while (start <= end && isSpaceOrNewLine(source[start]))
+        ++start;
+
+    // only white space
+    if (start > end)
+        return String16();
+
+    // skip white space from end
+    while (end && isSpaceOrNewLine(source[end]))
+        --end;
+
+    if (!start && end == source.length() - 1)
+        return source;
+    return String16(source.characters16() + start, end + 1 - start);
+}
+
+bool string16StartsWith(const String16& source, const char* prefix)
+{
+    size_t length = strlen(prefix);
+    if (source.length() < length)
+        return false;
+    for (size_t i = 0; i < length; ++i) {
+        if (source[i] != prefix[i])
+            return false;
+    }
+    return true;
+}
+
+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.insert(m_buffer.end(), 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.reserve(m_buffer.size() + length);
+    for (size_t i = 0; i < length; ++i, ++characters) {
+        UChar u = *characters;
+        m_buffer.push_back(u);
+    }
+}
+
+String16 String16Builder::toString()
+{
+    return String16(m_buffer.data(), m_buffer.size());
+}
+
+void String16Builder::reserveCapacity(size_t capacity)
+{
+    m_buffer.reserve(capacity);
+}
+
+} // namespace protocol
+} // namespace blink