Avoid using NULL-terminated strings when possible.

[cycript.git] / Library.cpp

/* Cycript - Optimizing JavaScript Compiler/Runtime
 * Copyright (C) 2009-2015  Jay Freeman (saurik)
*/

/* GNU Affero General Public License, Version 3 {{{ */
/*
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Affero General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.

 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU Affero General Public License for more details.

 * You should have received a copy of the GNU Affero General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
**/
/* }}} */

#include "cycript.hpp"

#include <iostream>
#include <set>
#include <map>
#include <iomanip>
#include <sstream>
#include <cmath>

#include <dlfcn.h>

#include <sys/mman.h>

#include "ConvertUTF.h"
#include "Driver.hpp"
#include "Error.hpp"
#include "Execute.hpp"
#include "Pooling.hpp"
#include "String.hpp"
#include "Syntax.hpp"

template <>
::pthread_key_t CYLocal<CYPool>::key_ = Key_();

/* C Strings {{{ */
CYUTF8String CYPoolUTF8String(CYPool &pool, CYUTF16String utf16) {
    // XXX: this is wrong
    size_t size(utf16.size * 5);
    char *temp(new(pool) char[size]);

    const uint16_t *lhs(utf16.data);
    uint8_t *rhs(reinterpret_cast<uint8_t *>(temp));
    _assert(ConvertUTF16toUTF8(&lhs, lhs + utf16.size, &rhs, rhs + size, lenientConversion) == conversionOK);

    *rhs = 0;
    return CYUTF8String(temp, reinterpret_cast<char *>(rhs) - temp);
}

CYUTF16String CYPoolUTF16String(CYPool &pool, CYUTF8String utf8) {
    // XXX: this is wrong
    size_t size(utf8.size * 5);
    uint16_t *temp(new (pool) uint16_t[size]);

    const uint8_t *lhs(reinterpret_cast<const uint8_t *>(utf8.data));
    uint16_t *rhs(temp);
    _assert(ConvertUTF8toUTF16(&lhs, lhs + utf8.size, &rhs, rhs + size, lenientConversion) == conversionOK);

    *rhs = 0;
    return CYUTF16String(temp, rhs - temp);
}
/* }}} */
/* Index Offsets {{{ */
size_t CYGetIndex(const CYUTF8String &value) {
    if (value.data[0] != '0') {
        size_t index(0);
        for (size_t i(0); i != value.size; ++i) {
            if (!DigitRange_[value.data[i]])
                return _not(size_t);
            index *= 10;
            index += value.data[i] - '0';
        }
        return index;
    } else if (value.size == 1)
        return 0;
    else
        return _not(size_t);
}

// XXX: this isn't actually right
bool CYGetOffset(const char *value, ssize_t &index) {
    if (value[0] != '0') {
        char *end;
        index = strtol(value, &end, 10);
        if (value + strlen(value) == end)
            return true;
    } else if (value[1] == '\0') {
        index = 0;
        return true;
    }

    return false;
}
/* }}} */
/* JavaScript *ify {{{ */
void CYStringify(std::ostringstream &str, const char *data, size_t size) {
    unsigned quot(0), apos(0);
    for (const char *value(data), *end(data + size); value != end; ++value)
        if (*value == '"')
            ++quot;
        else if (*value == '\'')
            ++apos;

    bool single(quot > apos);

    str << (single ? '\'' : '"');

    for (const char *value(data), *end(data + size); value != end; ++value)
        switch (uint8_t next = *value) {
            case '\\': str << "\\\\"; break;
            case '\b': str << "\\b"; break;
            case '\f': str << "\\f"; break;
            case '\n': str << "\\n"; break;
            case '\r': str << "\\r"; break;
            case '\t': str << "\\t"; break;
            case '\v': str << "\\v"; break;

            case '"':
                if (!single)
                    str << "\\\"";
                else goto simple;
            break;

            case '\'':
                if (single)
                    str << "\\'";
                else goto simple;
            break;

            case '\0':
                if (value[1] >= '0' && value[1] <= '9')
                    str << "\\x00";
                else
                    str << "\\0";
            break;

            default:
                if (next >= 0x20 && next < 0x7f) simple:
                    str << *value;
                else {
                    unsigned levels(1);
                    if ((next & 0x80) != 0)
                        while ((next & 0x80 >> ++levels) != 0);

                    unsigned point(next & 0xff >> levels);
                    while (--levels != 0)
                        point = point << 6 | uint8_t(*++value) & 0x3f;

                    if (point < 0x100)
                        str << "\\x" << std::setbase(16) << std::setw(2) << std::setfill('0') << point;
                    else if (point < 0x10000)
                        str << "\\u" << std::setbase(16) << std::setw(4) << std::setfill('0') << point;
                    else {
                        point -= 0x10000;
                        str << "\\u" << std::setbase(16) << std::setw(4) << std::setfill('0') << (0xd800 | point >> 0x0a);
                        str << "\\u" << std::setbase(16) << std::setw(4) << std::setfill('0') << (0xdc00 | point & 0x3ff);
                    }
                }
        }

    str << (single ? '\'' : '"');
}

void CYNumerify(std::ostringstream &str, double value) {
    if (std::isinf(value)) {
        if (value < 0)
            str << '-';
        str << "Infinity";
        return;
    }

    char string[32];
    // XXX: I want this to print 1e3 rather than 1000
    sprintf(string, "%.17g", value);
    str << string;
}

bool CYIsKey(CYUTF8String value) {
    const char *data(value.data);
    size_t size(value.size);

    if (size == 0)
        return false;

    if (DigitRange_[data[0]]) {
        size_t index(CYGetIndex(value));
        if (index == _not(size_t))
            return false;
    } else {
        if (!WordStartRange_[data[0]])
            return false;
        for (size_t i(1); i != size; ++i)
            if (!WordEndRange_[data[i]])
                return false;
    }

    return true;
}
/* }}} */

double CYCastDouble(const char *value, size_t size) {
    char *end;
    double number(strtod(value, &end));
    if (end != value + size)
        return NAN;
    return number;
}

double CYCastDouble(const char *value) {
    return CYCastDouble(value, strlen(value));
}

_visible bool CYStartsWith(const CYUTF8String &haystack, const CYUTF8String &needle) {
    return haystack.size >= needle.size && strncmp(haystack.data, needle.data, needle.size) == 0;
}

CYUTF8String CYPoolCode(CYPool &pool, std::istream &stream) {
    CYLocalPool local;
    CYDriver driver(local, stream);
    _assert(!driver.Parse());
    _assert(driver.errors_.empty());

    CYOptions options;
    CYContext context(options);
    driver.script_->Replace(context);

    std::stringbuf str;
    CYOutput out(str, options);
    out << *driver.script_;
    return $pool.strdup(str.str().c_str());
}

CYPool &CYGetGlobalPool() {
    static CYPool pool;
    return pool;
}

_visible void CYThrow(const char *format, ...) {
    va_list args;
    va_start(args, format);
    throw CYPoolError(format, args);
    // XXX: does this matter? :(
    va_end(args);
}

const char *CYPoolError::PoolCString(CYPool &pool) const {
    return pool.strdup(message_);
}

CYPoolError::CYPoolError(const CYPoolError &rhs) :
    message_(pool_.strdup(rhs.message_))
{
}

CYPoolError::CYPoolError(const char *format, ...) {
    va_list args;
    va_start(args, format);
    // XXX: there might be a beter way to think about this
    message_ = pool_.vsprintf(64, format, args);
    va_end(args);
}

CYPoolError::CYPoolError(const char *format, va_list args) {
    // XXX: there might be a beter way to think about this
    message_ = pool_.vsprintf(64, format, args);
}