# coding: utf-8

# RGBDS BSS section and constant parsing.

import os
path = os.path.dirname(os.path.abspath(__file__))


def read_bss_sections(bss):
	sections = []
	section = {}
	address = None
	if type(bss) is not list: bss = bss.split('\n')
	for line in bss:
		line = line.lstrip()
		if 'SECTION' in line:
			if section: sections.append(section) # last section
			
			address = eval(line[line.find('[')+1:line.find(']')].replace('$','0x'))
			section = {
				'name': line.split('"')[1],
				#'type': line.split(',')[1].split('[')[0].strip(),
				'start': address,
				'labels': [],
			}

		elif ':' in line:
			# rgbds allows labels without :, but prefer convention
			label = line[:line.find(':')]
			if ';' not in label:
				section['labels'] += [{
					'label': label,
					'address': address,
					'length': 0,
				}]

		elif line[:3] == 'ds ':
			length = eval(line[3:line.find(';')].replace('$','0x'))
			address += length
			# adjacent labels use the same space
			for label in section['labels'][::-1]:
				if label['length'] == 0:
					label['length'] = length
				else:
					break

		elif 'EQU' in line:
			# some space is defined using constants
			name, value = line.split('EQU')
			name, value = name.strip(), value.strip().replace('$','0x').replace('%','0b')
			globals()[name] = eval(value)

	sections.append(section)
	return sections

wram_sections = read_bss_sections(open(os.path.join(path, '../wram.asm'), 'r').readlines())


def make_wram_labels():
	wram_labels = {}
	for section in wram_sections:
		for label in section['labels']:
			if label['address'] not in wram_labels.keys():
				wram_labels[label['address']] = []
			wram_labels[label['address']] += [label['label']]
	return wram_labels

wram_labels = make_wram_labels()


def constants_to_dict(constants):
	return dict((eval(constant[constant.find('EQU')+3:constant.find(';')].replace('$','0x')), constant[:constant.find('EQU')].strip()) for constant in constants)

def scrape_constants(text):
	if type(text) is not list:
		text = text.split('\n')
	return constants_to_dict([line for line in text if 'EQU' in line[:line.find(';')]])

hram_constants = scrape_constants(open(os.path.join(path, '../hram.asm'),'r').readlines())
gbhw_constants = scrape_constants(open(os.path.join(path, '../gbhw.asm'),'r').readlines())