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/*
==============================================================================
This file is part of the JUCE library.
Copyright (c) 2015 - ROLI Ltd.
Permission is granted to use this software under the terms of either:
a) the GPL v2 (or any later version)
b) the Affero GPL v3
Details of these licenses can be found at: www.gnu.org/licenses
JUCE 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 General Public License for more details.
------------------------------------------------------------------------------
To release a closed-source product which uses JUCE, commercial licenses are
available: visit www.juce.com for more information.
==============================================================================
*/
struct LuaTokeniserFunctions
{
static bool isReservedKeyword (String::CharPointerType token, const int tokenLength) noexcept
{
static const char* const keywords2Char[] =
{ "if", "or", "in", "do", nullptr };
static const char* const keywords3Char[] =
{ "and", "end", "for", "nil", "not", nullptr };
static const char* const keywords4Char[] =
{ "then", "true", "else", nullptr };
static const char* const keywords5Char[] =
{ "false", "local", "until", "while", "break", nullptr };
static const char* const keywords6Char[] =
{ "repeat", "return", "elseif", nullptr};
static const char* const keywordsOther[] =
{ "function", "@interface", "@end", "@synthesize", "@dynamic", "@public",
"@private", "@property", "@protected", "@class", nullptr };
const char* const* k;
switch (tokenLength)
{
case 2: k = keywords2Char; break;
case 3: k = keywords3Char; break;
case 4: k = keywords4Char; break;
case 5: k = keywords5Char; break;
case 6: k = keywords6Char; break;
default:
if (tokenLength < 2 || tokenLength > 16)
return false;
k = keywordsOther;
break;
}
for (int i = 0; k[i] != 0; ++i)
if (token.compare (CharPointer_ASCII (k[i])) == 0)
return true;
return false;
}
template <typename Iterator>
static int parseIdentifier (Iterator& source) noexcept
{
int tokenLength = 0;
String::CharPointerType::CharType possibleIdentifier [100];
String::CharPointerType possible (possibleIdentifier);
while (CppTokeniserFunctions::isIdentifierBody (source.peekNextChar()))
{
const juce_wchar c = source.nextChar();
if (tokenLength < 20)
possible.write (c);
++tokenLength;
}
if (tokenLength > 1 && tokenLength <= 16)
{
possible.writeNull();
if (isReservedKeyword (String::CharPointerType (possibleIdentifier), tokenLength))
return LuaTokeniser::tokenType_keyword;
}
return LuaTokeniser::tokenType_identifier;
}
template <typename Iterator>
static int readNextToken (Iterator& source)
{
source.skipWhitespace();
const juce_wchar firstChar = source.peekNextChar();
switch (firstChar)
{
case 0:
break;
case '0': case '1': case '2': case '3': case '4':
case '5': case '6': case '7': case '8': case '9':
case '.':
{
int result = CppTokeniserFunctions::parseNumber (source);
if (result == LuaTokeniser::tokenType_error)
{
source.skip();
if (firstChar == '.')
return LuaTokeniser::tokenType_punctuation;
}
return result;
}
case ',':
case ';':
case ':':
source.skip();
return LuaTokeniser::tokenType_punctuation;
case '(': case ')':
case '{': case '}':
case '[': case ']':
source.skip();
return LuaTokeniser::tokenType_bracket;
case '"':
case '\'':
CppTokeniserFunctions::skipQuotedString (source);
return LuaTokeniser::tokenType_string;
case '+':
source.skip();
CppTokeniserFunctions::skipIfNextCharMatches (source, '+', '=');
return LuaTokeniser::tokenType_operator;
case '-':
{
source.skip();
int result = CppTokeniserFunctions::parseNumber (source);
if (source.peekNextChar() == '-')
{
source.skipToEndOfLine();
return LuaTokeniser::tokenType_comment;
}
if (result == LuaTokeniser::tokenType_error)
{
CppTokeniserFunctions::skipIfNextCharMatches (source, '-', '=');
return LuaTokeniser::tokenType_operator;
}
return result;
}
case '*': case '%':
case '=': case '!':
source.skip();
CppTokeniserFunctions::skipIfNextCharMatches (source, '=');
return LuaTokeniser::tokenType_operator;
case '?':
case '~':
source.skip();
return LuaTokeniser::tokenType_operator;
case '<': case '>':
case '|': case '&': case '^':
source.skip();
CppTokeniserFunctions::skipIfNextCharMatches (source, firstChar);
CppTokeniserFunctions::skipIfNextCharMatches (source, '=');
return LuaTokeniser::tokenType_operator;
default:
if (CppTokeniserFunctions::isIdentifierStart (firstChar))
return parseIdentifier (source);
source.skip();
break;
}
return LuaTokeniser::tokenType_error;
}
};
//==============================================================================
LuaTokeniser::LuaTokeniser() {}
LuaTokeniser::~LuaTokeniser() {}
int LuaTokeniser::readNextToken (CodeDocument::Iterator& source)
{
return LuaTokeniserFunctions::readNextToken (source);
}
CodeEditorComponent::ColourScheme LuaTokeniser::getDefaultColourScheme()
{
static const CodeEditorComponent::ColourScheme::TokenType types[] =
{
{ "Error", Colour (0xffcc0000) },
{ "Comment", Colour (0xff3c3c3c) },
{ "Keyword", Colour (0xff0000cc) },
{ "Operator", Colour (0xff225500) },
{ "Identifier", Colour (0xff000000) },
{ "Integer", Colour (0xff880000) },
{ "Float", Colour (0xff885500) },
{ "String", Colour (0xff990099) },
{ "Bracket", Colour (0xff000055) },
{ "Punctuation", Colour (0xff004400) }
};
CodeEditorComponent::ColourScheme cs;
for (unsigned int i = 0; i < sizeof (types) / sizeof (types[0]); ++i) // (NB: numElementsInArray doesn't work here in GCC4.2)
cs.set (types[i].name, types[i].colour);
return cs;
}
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