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import TokenType.*
import exceptions.*
class Lexical {
/**
* Analyzes the given [source] and returns the tokens divided into an array of statements
* TODO: Add line number to token (abstract to class?)
*/
fun analyze(source: String): MutableList<MutableList<Pair<String, TokenType>>> {
var buffer = ""
var skipStatementEnd = false
var statementEnd: Boolean
val statements = mutableListOf<MutableList<Pair<String, TokenType>>>()
val currentStatement = mutableListOf<Pair<String, TokenType>>()
for (i in source.indices) {
buffer += source[i]
if (source[i] == '"') skipStatementEnd = !skipStatementEnd
statementEnd = source[i] == ';' && !skipStatementEnd
val tokenType = getTokenType(buffer, if (source.length > i + 1) source[i + 1] else ' ')
if (tokenType != Skip && !statementEnd) {
currentStatement.add(buffer to tokenType)
buffer = ""
} else if (statementEnd) {
statements.add(currentStatement.toMutableList())
currentStatement.clear()
buffer = ""
}
}
return statements
}
/**
* Matches the tokens to a [TokenType]
*/
private fun getTokenType(token: String, next: Char): TokenType {
return when {
token + next in keyword -> Skip
token in keyword -> Keyword
token + next in comparison -> Skip
token in assignment -> Assignment
token + next in assignment -> Skip
token in arithmetic -> Arithmetic
token + next in comparison -> Skip
token in comparison -> Comparison
token + next in comparison -> Skip
token in logical -> Logical
(token + next).matches(Regex("[a-zA-Z]*")) -> Skip
token.matches(Regex("[a-zA-Z]*")) -> Identifier
(token + next).matches(Regex("[0-9]*")) -> Skip
token.matches(Regex("[0-9]*")) -> Constant
token in emptiness && token.length > 1 -> throw UnknownType(token)
token in emptiness -> Empty
token in punctuation -> Punctuation
token in brackets -> Bracket
token in classifier -> Classifier
else -> 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("\"", "'")
private val emptiness = listOf(" ", "\t")
}
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