//
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//
// atom.c
//

#define _CRT_SECURE_NO_WARNINGS

#include <assert.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>

#include "PpContext.h"
#include "PpTokens.h"

namespace {

using namespace glslang;

const struct {
    int val;
    const char* str;
} tokens[] = {
    { PpAtomDefine,         "define" },
    { PpAtomDefined,        "defined" },
    { PpAtomUndef,          "undef" },
    { PpAtomIf,             "if" },
    { PpAtomElif,           "elif" },
    { PpAtomElse,           "else" },
    { PpAtomEndif,          "endif" },
    { PpAtomIfdef,          "ifdef" },
    { PpAtomIfndef,         "ifndef" },
    { PpAtomLine,           "line" },
    { PpAtomPragma,         "pragma" },
    { PpAtomError,          "error" },

    { PpAtomVersion,        "version" },
    { PpAtomCore,           "core" },
    { PpAtomCompatibility,  "compatibility" },
    { PpAtomEs,             "es" },
    { PpAtomExtension,      "extension" },

    { PpAtomLineMacro,       "__LINE__" },
    { PpAtomFileMacro,       "__FILE__" },
    { PpAtomVersionMacro,    "__VERSION__" },

    { PpAtomInclude,        "include" },

};

} // end anonymous namespace

namespace glslang {

//
// Map a new or existing string to an atom, inventing a new atom if necessary.
//
int TPpContext::LookUpAddString(const char* s)
{
    auto it = atomMap.find(s);
    if (it == atomMap.end()) {
        AddAtomFixed(s, nextAtom);
        return nextAtom++;
    } else
        return it->second;
}

//
// Map an already created atom to its string.
//
const char* TPpContext::GetAtomString(int atom)
{
    if ((size_t)atom >= stringMap.size())
        return "<bad token>";

    const TString* atomString = stringMap[atom];

    return atomString ? atomString->c_str() : "<bad token>";
}

//
// Add forced mapping of string to atom.
//
void TPpContext::AddAtomFixed(const char* s, int atom)
{
    auto it = atomMap.insert(std::pair<TString, int>(s, atom)).first;
    if (stringMap.size() < (size_t)atom + 1)
        stringMap.resize(atom + 100, 0);
    stringMap[atom] = &it->first;
}

//
// Initialize the atom table.
//
void TPpContext::InitAtomTable()
{
    // Add single character tokens to the atom table:
    const char* s = "~!%^&*()-+=|,.<>/?;:[]{}#\\";
    char t[2];

    t[1] = '\0';
    while (*s) {
        t[0] = *s;
        AddAtomFixed(t, s[0]);
        s++;
    }

    // Add multiple character scanner tokens :
    for (size_t ii = 0; ii < sizeof(tokens)/sizeof(tokens[0]); ii++)
        AddAtomFixed(tokens[ii].str, tokens[ii].val);

    nextAtom = PpAtomLast;
}

} // end namespace glslang