string_utils.cpp

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Author : Courtney Goeltzenleuchter
Date : 2020-11-04 18:20:24
Hash : a481bee2
Message : Add GetEnvironmentVarOrUnCachedAndroidProperty GetEnvironmentVarOrAndroidProperty will first return the given variableName from the processes enviroment if defined. If not defined and running on Android, will look up the corresponding property and store it in the environment. The framecapture code wants to see when the Android property changes so add an uncached version of GetEnvironmentVarOrAndroidProperty that always does the getprop command (which can be time consuming). Bug: b/170328907 Change-Id: I0624c0646889435cb6f6eb20a6d3cceb6ae3eb48 Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/2520107 Reviewed-by: Jamie Madill <jmadill@chromium.org> Reviewed-by: Ian Elliott <ianelliott@google.com> Reviewed-by: Cody Northrop <cnorthrop@google.com> Commit-Queue: Courtney Goeltzenleuchter <courtneygo@google.com>

src/common/string_utils.cpp

//
// Copyright 2015 The ANGLE 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.
//
// string_utils:
//   String helper functions.
//

#include "common/string_utils.h"

#include <stdlib.h>
#include <string.h>
#include <algorithm>
#include <fstream>
#include <sstream>

#include "common/platform.h"
#include "common/system_utils.h"

namespace
{

bool EndsWithSuffix(const char *str,
                    const size_t strLen,
                    const char *suffix,
                    const size_t suffixLen)
{
    return suffixLen <= strLen && strncmp(str + strLen - suffixLen, suffix, suffixLen) == 0;
}

}  // anonymous namespace

namespace angle
{

const char kWhitespaceASCII[] = " \f\n\r\t\v";

std::vector<std::string> SplitString(const std::string &input,
                                     const std::string &delimiters,
                                     WhitespaceHandling whitespace,
                                     SplitResult resultType)
{
    std::vector<std::string> result;
    if (input.empty())
    {
        return result;
    }

    std::string::size_type start = 0;
    while (start != std::string::npos)
    {
        auto end = input.find_first_of(delimiters, start);

        std::string piece;
        if (end == std::string::npos)
        {
            piece = input.substr(start);
            start = std::string::npos;
        }
        else
        {
            piece = input.substr(start, end - start);
            start = end + 1;
        }

        if (whitespace == TRIM_WHITESPACE)
        {
            piece = TrimString(piece, kWhitespaceASCII);
        }

        if (resultType == SPLIT_WANT_ALL || !piece.empty())
        {
            result.push_back(std::move(piece));
        }
    }

    return result;
}

void SplitStringAlongWhitespace(const std::string &input, std::vector<std::string> *tokensOut)
{

    std::istringstream stream(input);
    std::string line;

    while (std::getline(stream, line))
    {
        size_t prev = 0, pos;
        while ((pos = line.find_first_of(kWhitespaceASCII, prev)) != std::string::npos)
        {
            if (pos > prev)
                tokensOut->push_back(line.substr(prev, pos - prev));
            prev = pos + 1;
        }
        if (prev < line.length())
            tokensOut->push_back(line.substr(prev, std::string::npos));
    }
}

std::string TrimString(const std::string &input, const std::string &trimChars)
{
    auto begin = input.find_first_not_of(trimChars);
    if (begin == std::string::npos)
    {
        return "";
    }

    std::string::size_type end = input.find_last_not_of(trimChars);
    if (end == std::string::npos)
    {
        return input.substr(begin);
    }

    return input.substr(begin, end - begin + 1);
}

std::string GetPrefix(const std::string &input, size_t offset, const char *delimiter)
{
    size_t match = input.find(delimiter, offset);
    if (match == std::string::npos)
    {
        return input.substr(offset);
    }
    return input.substr(offset, match - offset);
}

std::string GetPrefix(const std::string &input, size_t offset, char delimiter)
{
    size_t match = input.find(delimiter, offset);
    if (match == std::string::npos)
    {
        return input.substr(offset);
    }
    return input.substr(offset, match - offset);
}

bool HexStringToUInt(const std::string &input, unsigned int *uintOut)
{
    unsigned int offset = 0;

    if (input.size() >= 2 && input[0] == '0' && input[1] == 'x')
    {
        offset = 2u;
    }

    // Simple validity check
    if (input.find_first_not_of("0123456789ABCDEFabcdef", offset) != std::string::npos)
    {
        return false;
    }

    std::stringstream inStream(input);
    inStream >> std::hex >> *uintOut;
    return !inStream.fail();
}

bool ReadFileToString(const std::string &path, std::string *stringOut)
{
    std::ifstream inFile(path.c_str());
    if (inFile.fail())
    {
        return false;
    }

    inFile.seekg(0, std::ios::end);
    stringOut->reserve(static_cast<std::string::size_type>(inFile.tellg()));
    inFile.seekg(0, std::ios::beg);

    stringOut->assign(std::istreambuf_iterator<char>(inFile), std::istreambuf_iterator<char>());
    return !inFile.fail();
}

bool BeginsWith(const std::string &str, const std::string &prefix)
{
    return strncmp(str.c_str(), prefix.c_str(), prefix.length()) == 0;
}

bool BeginsWith(const std::string &str, const char *prefix)
{
    return strncmp(str.c_str(), prefix, strlen(prefix)) == 0;
}

bool BeginsWith(const char *str, const char *prefix)
{
    return strncmp(str, prefix, strlen(prefix)) == 0;
}

bool BeginsWith(const std::string &str, const std::string &prefix, const size_t prefixLength)
{
    return strncmp(str.c_str(), prefix.c_str(), prefixLength) == 0;
}

bool EndsWith(const std::string &str, const std::string &suffix)
{
    return EndsWithSuffix(str.c_str(), str.length(), suffix.c_str(), suffix.length());
}

bool EndsWith(const std::string &str, const char *suffix)
{
    return EndsWithSuffix(str.c_str(), str.length(), suffix, strlen(suffix));
}

bool EndsWith(const char *str, const char *suffix)
{
    return EndsWithSuffix(str, strlen(str), suffix, strlen(suffix));
}

void ToLower(std::string *str)
{
    for (char &ch : *str)
    {
        ch = static_cast<char>(::tolower(ch));
    }
}

void ToUpper(std::string *str)
{
    for (char &ch : *str)
    {
        ch = static_cast<char>(::toupper(ch));
    }
}

bool ReplaceSubstring(std::string *str,
                      const std::string &substring,
                      const std::string &replacement)
{
    size_t replacePos = str->find(substring);
    if (replacePos == std::string::npos)
    {
        return false;
    }
    str->replace(replacePos, substring.size(), replacement);
    return true;
}

std::vector<std::string> GetStringsFromEnvironmentVar(const char *varName, const char *separator)
{
    std::string environment = GetEnvironmentVar(varName);
    return SplitString(environment, separator, TRIM_WHITESPACE, SPLIT_WANT_NONEMPTY);
}

std::vector<std::string> GetCachedStringsFromEnvironmentVarOrAndroidProperty(
    const char *varName,
    const char *propertyName,
    const char *separator)
{
    std::string environment = GetEnvironmentVarOrAndroidProperty(varName, propertyName);
    return SplitString(environment, separator, TRIM_WHITESPACE, SPLIT_WANT_NONEMPTY);
}
}  // namespace angle

kc3-lang/angle/src/common/string_utils.cpp

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kc3-lang/angle /src/common/string_utils.cpp