39 lines
1.1 KiB
Kotlin
39 lines
1.1 KiB
Kotlin
package android.emu6502
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import android.emu6502.instructions.Symbols
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import java.util.*
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class Labels(private val assembler: Assembler, private val symbols: Symbols) : HashMap<String, Int>() {
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private val labelIndex: ArrayList<String> = ArrayList()
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fun indexLines(lines: List<String>) {
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lines.forEach { line ->
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indexLine(line)
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}
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}
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fun get(label: String): Int {
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return super.get(label) ?: -1
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}
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// Extract label if line contains one and calculate position in memory.
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// Return false if label already exists.
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private fun indexLine(input: String) {
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// Figure out how many bytes this instruction takes
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val currentPC = assembler.defaultCodePC;
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// TODO: find a better way for Labels to have access to assembler
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assembler.assembleLine(input);
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// Find command or label
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if (input.matches("^\\w+:".toRegex())) {
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val label = input.replace("(^\\w+):.*$".toRegex(), "$1");
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if (symbols.get(label) != null) {
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throw RuntimeException(
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"**Label " + label + "is already used as a symbol; please rename one of them**");
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}
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put(label, currentPC);
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}
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}
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} |