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import exceptions.UnknownType
class Lexical {
fun analyze(source: String): MutableList<Pair<String, TokenType>> {
var buffer = ""
var statementEnd = false
val tokens = mutableListOf<Pair<String, TokenType>>()
for (i in source.indices) {
buffer += source[i]
statementEnd = source[i] == ';'
val tokenType = getTokenType(buffer, if (source.length > i + 1) source[i + 1] else ' ')
if (tokenType != TokenType.Skip) {
tokens += buffer to tokenType
buffer = ""
}
}
return tokens
}
/**
* Matches the tokens to a [TokenType]
*/
private fun getTokenType(token: String, next: Char): TokenType {
return when {
token + next in keyword -> TokenType.Skip
token in keyword -> TokenType.Keyword
token + next in comparison -> TokenType.Skip
token in assignment -> TokenType.Assignment
token + next in assignment -> TokenType.Skip
token in arithmetic -> TokenType.Arithmetic
token + next in comparison -> TokenType.Skip
token in comparison -> TokenType.Comparison
token + next in comparison -> TokenType.Skip
token in logical -> TokenType.Logical
(token + next).matches(Regex("[a-zA-Z]*")) -> TokenType.Skip
token.matches(Regex("[a-zA-Z]*")) -> TokenType.Identifier
(token + next).matches(Regex("[0-9]*")) -> TokenType.Skip
token.matches(Regex("[0-9]*")) -> TokenType.Constant
token.contains(" ") && token.length > 1 -> throw UnknownType(token)
token == " " -> TokenType.Empty
token in punctuation -> TokenType.Punctuation
token in brackets -> TokenType.Bracket
token in classifier -> TokenType.Classifier
else -> TokenType.Skip
}
}
private val keyword = listOf("print") // TODO: DataType matching
private val assignment = listOf("=", "+=", "-=", "*=", "/*")
private val arithmetic = listOf("+", "-", "*", "/", "%")
private val comparison = listOf("==", "!=", "<", "<=", ">", ">=")
private val logical = listOf("&&", "||", "!")
private val punctuation = listOf(",", ":", ".", ";")
private val brackets = listOf("(", ")", "[", "]", "{", "}") // TODO: Use brackets for functions
private val classifier = listOf("\"", "'")
}
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