pyc_string.cpp

#include "pyc_string.h"
#include "pyc_module.h"
#include "data.h"
#include <cstring>

/* PycString */
void PycString::load(PycData* stream, PycModule* mod)
{
    if (m_value)
        delete[] m_value;

    if (type() == TYPE_STRINGREF) {
        PycRef<PycString> str = mod->getIntern(stream->get32());
        m_length = str->length();
        if (m_length) {
            m_value = new char[m_length+1];
            memcpy(m_value, str->value(), m_length);
            m_value[m_length] = 0;
        } else {
            m_value = 0;
        }
    } else {
        m_length = stream->get32();
        if (m_length) {
            m_value = new char[m_length+1];
            stream->getBuffer(m_length, m_value);
            m_value[m_length] = 0;
        } else {
            m_value = 0;
        }

        if (type() == TYPE_INTERNED)
            mod->intern(this);
    }
}

bool PycString::isEqual(PycRef<PycObject> obj) const
{
    if (type() != obj->type())
        return false;

    PycRef<PycString> strObj = obj.cast<PycString>();
    return isEqual(strObj->m_value);
}

bool PycString::isEqual(const char* str) const
{
    if (m_value == str)
        return true;
    return (strcmp(m_value, str) == 0);
}

void OutputString(PycRef<PycString> str, char prefix, bool triple, FILE* F)
{
    if (prefix != 0)
        fputc(prefix, F);

    const char* ch = str->value();
    int len = str->length();
    if (ch == 0) {
        fprintf(F, "''");
        return;
    }

    // Determine preferred quote style (Emulate Python's method)
    bool useQuotes = false;
    while (len--) {
        if (*ch == '\'') {
            useQuotes = true;
        } else if (*ch == '"') {
            useQuotes = false;
            break;
        }
        ch++;
    }
    ch = str->value();
    len = str->length();

    // Output the string
    if (triple)
        fprintf(F, useQuotes ? "\"\"\"" : "'''");
    else
        fputc(useQuotes ? '"' : '\'', F);
    while (len--) {
        if (*ch < 0x20 || *ch == 0x7F) {
            if (*ch == '\r') {
                fprintf(F, "\\r");
            } else if (*ch == '\n') {
                if (triple)
                    fputc('\n', F);
                else
                    fprintf(F, "\\n");
            } else if (*ch == '\t') {
                fprintf(F, "\\t");
            } else {
                fprintf(F, "\\x%x", (*ch & 0xFF));
            }
        } else if ((unsigned char)(*ch) >= 0x80) {
            if (str->type() == PycObject::TYPE_UNICODE) {
                // Unicode stored as UTF-8...  Let the stream interpret it
                fputc(*ch, F);
            } else {
                fprintf(F, "\\x%x", (*ch & 0xFF));
            }
        } else {
            if (!useQuotes && *ch == '\'')
                fprintf(F, "\\'");
            else if (useQuotes && *ch == '"')
                fprintf(F, "\\\"");
            else if (*ch == '\\')
                fprintf(F, "\\\\");
            else
                fputc(*ch, F);
        }
        ch++;
    }
    if (triple)
        fprintf(F, useQuotes ? "\"\"\"" : "'''");
    else
        fputc(useQuotes ? '"' : '\'', F);
}