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Tokenizer.lua
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Tokenizer.lua
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local Util = require("Util");
local lookupify = Util.lookupify;
local EOF = "";
local base_ident = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ_";
local base_digits = "1234567890";
local base_operators = "+-*/^%#";
local chars = {
whitespace = lookupify(" \t\r"),
validEscapes = lookupify('abfnrtv"\'\\'),
ident = lookupify(base_ident .. base_digits, { start = lookupify(base_ident) }),
digits = lookupify(base_digits, { hex = lookupify(base_digits .. "abcdefABCDEF") }),
symbols = lookupify(base_operators .. ",{}[]();.:", { equality = lookupify("~=><"), operators = lookupify(base_operators) }),
};
local keywords = { structure = lookupify({
"and",
"break",
"do",
"else",
"elseif",
"end",
"for",
"function",
"goto",
"if",
"in",
"local",
"not",
"or",
"repeat",
"return",
"then",
"until",
"while",
}), values = lookupify({ "true", "false", "nil" }) };
local function isWhiteSpace(char)
return chars.whitespace[char] ~= nil;
end;
local function isEscape(char)
return chars.validEscapes[char] ~= nil;
end;
local function isBase(char)
return chars.ident.start[char] ~= nil;
end;
local function isIdent(char)
return chars.ident[char] ~= nil;
end;
local function isDigit(char)
return chars.digits[char] ~= nil;
end;
local function isSymbol(char)
return chars.symbols[char];
end;
local function isOperator(char)
return chars.symbols.operators[char];
end;
local function isEqualityOperator(char)
return chars.symbols.equality[char];
end;
local function isHexDigit(char)
return chars.digits.hex[char];
end;
local function isKeyword(word)
return keywords.structure[word] ~= nil;
end;
local function isBoolean(word)
return keywords.values[word] ~= nil;
end;
local function isEndOfLine(char)
return char == "\n" or char == "\r";
end;
return function(text)
local pos = 1;
local start = 1;
local posOffset = 0;
local tokens = {};
local function ErrorLog(msg, pos)
print("Error: " .. msg);
error("Error in position: " .. pos, 0);
end;
local function look(delta)
delta = pos + (delta or 0);
return text:sub(delta, delta);
end;
local function get()
pos = pos + 1;
return look(-1);
end;
local function getCurrentTokenText()
return text:sub(start, pos - 1);
end;
local function AddToken(name, data)
local token = data or getCurrentTokenText();
local tokenPos = (posOffset + #token) - #token;
local tk = {
TYPE = name,
DATA = token,
FIRSTPOS = tokenPos,
LASTPOS = (tokenPos + #token) - 1,
};
table.insert(tokens, tk);
tokenPos = 0;
return tk;
end;
local function getDataLevel()
local num = 0;
while look(num) == "=" do
num = num + 1;
end;
if look(num) == "[" then
pos = (pos + num) + 1;
return num;
end;
end;
local function getData(level)
local level, data, Clevel, valid = level;
if level then
posOffset = pos;
start = posOffset;
while true do
local charL = get();
if charL == "]" then
valid = true;
pos = pos - 1;
data = getCurrentTokenText();
pos = pos + 1;
break;
end;
end;
for i = 1, level, 1 do
if look() == "=" then
pos = pos + 1;
else
valid = false;
ErrorLog("The data level must be equal", pos);
break;
end;
end;
if valid and look() == "]" then
pos = (pos - level) - 1;
posOffset = pos;
start = posOffset;
pos = (pos + level) + 2;
elseif valid and look() == "=" then
ErrorLog("The data level must be equal", pos);
end;
return data;
end;
end;
local function chompWhitespace()
while true do
local char = look();
if char == "\n" then
pos = pos + 1;
posOffset = pos - 1;
start = posOffset;
AddToken("Newline");
elseif isWhiteSpace(char) then
pos = pos + 1;
else
break;
end;
end;
end;
local function isComment(char)
if char == "-" and look() == "-" then
posOffset = pos - 1;
start = posOffset;
pos = pos + 1;
while not isEndOfLine(look()) do
pos = pos + 1;
end;
return true;
end;
return false;
end;
while true do
chompWhitespace();
local char = get();
if char == EOF then
break;
elseif isComment(char) then
AddToken("Comment");
elseif (char == "-" and look() == "0") and look(1) == "x" then
posOffset = pos - 1;
start = posOffset;
pos = pos + 2;
while true do
if isDigit(look()) then
pos = pos + 1;
elseif look() == "." then
pos = pos + 1;
elseif isHexDigit(look()) then
pos = pos + 1;
else
break;
end;
end;
AddToken("Negative Hex Number");
elseif char == "0" and look() == "x" then
posOffset = pos - 1;
start = posOffset;
pos = pos + 1;
while true do
if isDigit(look()) then
pos = pos + 1;
elseif look() == "." then
pos = pos + 1;
elseif isHexDigit(look()) then
pos = pos + 1;
else
break;
end;
end;
AddToken("Hex Number");
elseif isDigit(char) or char == "." and isDigit(look()) or char == "-" and isDigit(look()) then
posOffset = pos - 1;
start = posOffset;
while true do
if isDigit(look()) then
pos = pos + 1;
elseif look() == "." then
pos = pos + 1;
elseif isHexDigit(look()) then
pos = pos + 1;
else
break;
end;
end;
AddToken("Number");
elseif char == "'" or char == '"' then
posOffset = pos - 1;
start = posOffset;
AddToken("String Start");
posOffset = pos;
start = posOffset;
while true do
local char2 = get();
if char2 == "\\" then
pos = pos + 1;
elseif char2 == "\n" then
ErrorLog("Single line string must not contain new line", pos);
break;
elseif char2 == char or char2 == EOF then
pos = pos - 1;
AddToken("String");
get();
posOffset = pos - 1;
start = posOffset;
AddToken("String End");
break;
end;
end;
elseif char == "=" then
if isWhiteSpace(look()) and isWhiteSpace(look(-2)) or not isEqualityOperator(look()) and not isEqualityOperator(look(-2)) then
posOffset = pos - 1;
start = posOffset;
AddToken("Assignment");
elseif (isEqualityOperator(look(-2)) and isWhiteSpace(look())) and isWhiteSpace(look(-3)) then
posOffset = pos - 2;
start = posOffset;
AddToken("Comparator");
end;
elseif isEqualityOperator(char) then
posOffset = pos - 1;
start = posOffset;
AddToken("Comparator");
elseif char == ":" and look() == ":" then
posOffset = pos - 1;
start = posOffset;
pos = pos + 1;
AddToken("Label Start");
chompWhitespace();
if isBase(look()) then
pos = pos + 1;
posOffset = pos - 1;
start = posOffset;
while isIdent(look()) do
pos = pos + 1;
end;
AddToken("Label");
chompWhitespace();
if look() == ":" and look(1) == ":" then
posOffset = pos;
start = posOffset;
pos = pos + 2;
AddToken("Label End");
end;
end;
elseif char == "." then
if look() == "." then
pos = pos + 1;
if look() == "." then
pos = pos + 1;
posOffset = pos - 3;
start = posOffset;
AddToken("Vararg");
end;
end;
elseif char == "[" and look() == "[" then
posOffset = pos - 1;
start = posOffset;
pos = pos + 1;
AddToken("Multi-string Start");
posOffset = pos;
start = posOffset;
while true do
local charMS = get();
if charMS == "]" and look() == "]" then
pos = pos - 1;
AddToken("Multi-string");
posOffset = pos;
start = posOffset;
pos = pos + 2;
AddToken("Multi-string End");
break;
end;
end;
elseif isOperator(char) then
posOffset = pos - 1;
start = posOffset;
AddToken("Operator");
elseif isSymbol(char) then
posOffset = pos - 1;
start = posOffset;
if look() == "=" then
local level = getDataLevel();
if level then
AddToken("Multi-string Start");
AddToken("Multi-string", getData(level));
AddToken("Multi-string End");
end;
else
AddToken("Symbol");
end;
elseif isBase(char) then
posOffset = pos - 1;
start = posOffset;
while isIdent(look()) do
pos = pos + 1;
end;
local word = getCurrentTokenText();
if isKeyword(word) then
AddToken("Keyword");
elseif isBoolean(word) then
AddToken("Boolean");
else
AddToken("Identifier");
end;
end;
end;
return tokens;
end;