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119 lines
3.0 KiB
C++
119 lines
3.0 KiB
C++
// This program generates the file tables_gen.hpp
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#include <iostream>
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using namespace std;
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#include <iconv.h>
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#include <cassert>
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void tab() { cout << " "; }
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// write one number with a space in front of it and a comma after it
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void num(char i, bool last)
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{
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// Convert i to its integer value, i.e. -128 to 127. Printing it directly
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// would result in non-printable characters in the source code, which is bad.
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cout << " " << static_cast<int>(i);
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if(!last) cout << ",";
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}
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// Write one table entry (UTF8 value), 1-5 bytes
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void writeChar(char *value, int length, bool last, const std::string &comment="")
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{
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assert(length >= 1 && length <= 5);
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tab();
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num(length, false);
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for(int i=0;i<5;i++)
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num(value[i], last && i==4);
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if(comment != "")
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cout << " // " << comment;
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cout << endl;
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}
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// What to write on missing characters
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void writeMissing(bool last)
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{
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// Just write a space character
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char value[5];
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value[0] = ' ';
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for(int i=1; i<5; i++)
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value[i] = 0;
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writeChar(value, 1, last, "not part of this charset");
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}
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int write_table(const std::string &charset, const std::string &tableName)
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{
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// Write table header
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cout << "static signed char " << tableName << "[] =\n{\n";
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// Open conversion system
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iconv_t cd = iconv_open ("UTF-8", charset.c_str());
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// Convert each character from 0 to 255
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for(int i=0; i<256; i++)
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{
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bool last = (i==255);
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char input = i;
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char *iptr = &input;
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size_t ileft = 1;
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char output[5];
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for(int k=0; k<5; k++) output[k] = 0;
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char *optr = output;
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size_t oleft = 5;
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size_t res = iconv(cd, &iptr, &ileft, &optr, &oleft);
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if(res) writeMissing(last);
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else writeChar(output, 5-oleft, last);
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}
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iconv_close (cd);
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// Finish table
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cout << "};\n";
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return 0;
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}
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int main()
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{
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// Write header guard
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cout << "#ifndef COMPONENTS_TOUTF8_TABLE_GEN_H\n#define COMPONENTS_TOUTF8_TABLE_GEN_H\n\n";
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// Write namespace
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cout << "namespace ToUTF8\n{\n\n";
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// Central European and Eastern European languages that use Latin script, such as
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// Polish, Czech, Slovak, Hungarian, Slovene, Bosnian, Croatian, Serbian (Latin script), Romanian and Albanian.
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cout << "\n/// Central European and Eastern European languages that use Latin script,"
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"\n/// such as Polish, Czech, Slovak, Hungarian, Slovene, Bosnian, Croatian,"
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"\n/// Serbian (Latin script), Romanian and Albanian."
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"\n";
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write_table("WINDOWS-1250", "windows_1250");
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// Cyrillic alphabet such as Russian, Bulgarian, Serbian Cyrillic and other languages
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cout << "\n/// Cyrillic alphabet such as Russian, Bulgarian, Serbian Cyrillic"
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"\n/// and other languages"
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"\n";
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write_table("WINDOWS-1251", "windows_1251");
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// English
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cout << "\n/// Latin alphabet used by English and some other Western languages"
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"\n";
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write_table("WINDOWS-1252", "windows_1252");
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write_table("CP437", "cp437");
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// Close namespace
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cout << "\n}\n\n";
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// Close header guard
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cout << "#endif\n\n";
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return 0;
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}
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