package slangc.sdk;

import slangc.parser.Source;

public class ArgsLoader {
	
	public static String[] remove(String[] array, int index) {
		if (index < 0 || index >= array.length) {
			return array;
		}
		if (array.length == 1) {
			return new String[0];
		}
		String[] a = new String[array.length - 1];
		for (int i = 0; i < a.length; i++) {
			if (i < index) {
				a[i] = array[i];
			} else {
				a[i] = array[i + 1];
			}
		}
		return a;
	}
	
	public static String[] insert(String[] array, int index, String[] values) {
		String[] a = new String[array.length + values.length];
		for (int i = 0; i < a.length; i++) {
			if (i < index) {
				a[i] = array[i];
			} else if (i < index + values.length) {
				a[i] = values[i - index];
			} else {
				a[i] = array[i - values.length];
			}
		}
		return a;
	}
	
	public static String[] loadArgs(Source source) {
		int i = 0;
		int lastStart = -1;
		int count = 0;
		String[] result = new String[0];
		
		while (source.isIndexWithinBounds(i)) {
			int c = source.getCharacter(i);
			String str = String.construct(new int[]{c});
			//Log.line("Reading new character '" + str + "'");
			if (c == '\n' || c == ' ' || c == '\r' || c == '\f' || c == '\t' || c == '\n') {
				//Log.line("Is separator");
				if (lastStart >= 0) {
					result = innerAppend(result, source, lastStart, count);
					//Log.line("Loaded arg '" + result[result.length-1] + "'");
				}
				lastStart = -1;
				count = 0;
			} else {
				//Log.line("Is not separator");
				if (lastStart < 0) {
					lastStart = i;
				}
				count++;
			}
			i = source.getNextIndex(i);
		}
		
		result = innerAppend(result, source, lastStart, count);
		//Log.line("Loaded arg '" + result[result.length-1] + "'");
		
		return result;
	}

	private static String[] innerAppend(String[] result, Source source, int lastStart, int count) {
		if (count > 0) {
			result = insert(result, result.length, new String[] {source.getString(lastStart, count)});
		}
		return result;
	}
}