# -*- coding: utf-8 -*-
from pygments.lexer import RegexLexer
from pygments.lexer import include
from pygments.token import Comment
from pygments.token import Name
from pygments.token import Number
from pygments.token import Punctuation
from pygments.token import String
from pygments.token import Text

__all__ = ['PwntoolsLexer']

class PwntoolsLexer(RegexLexer):
    """
    Fork from pwntools
    https://github.com/Gallopsled/pwntools/blob/7860eecf025135380b137dd9df85dd02a2fd1667/pwnlib/lexer.py

    Edit:
        * Remove Objdump rules
        * Merge pygments-arm (https://github.com/heia-fr/pygments-arm)
    """
    name = 'PwntoolsLexer'
    filenames = ['*.s', '*.S', '*.asm']

    #: optional Comment or Whitespace
    string = r'"(\\"|[^"])*"'
    char = r'[\w$.@-]'
    identifier = r'(?:[a-zA-Z$_]' + char + '*|\.' + char + '+|or)'
    number = r'(?:0[xX][a-zA-Z0-9]+|\d+)'
    memory = r'(?:[\]\[])'

    eol = r'[\r\n]+'

    tokens = {
        'root': [
            include('whitespace'),

            # Label
            (identifier + ':', Name.Label),
            (number + ':', Name.Label),

            # AT&T directive
            (r'\.' + identifier, Name.Attribute, 'directive-args'),
            (r'lock|rep(n?z)?|data\d+', Name.Attribute),

            # Instructions
            (identifier, Name.Function, 'instruction-args'),

            (r'[\r\n]+', Text),
        ],
        'directive-args': [
            (identifier, Name.Constant),
            (string, String),
            ('@' + identifier, Name.Attribute),
            (number, Number.Integer),

            (eol, Text, '#pop'),
            (r'#.*?$', Comment, '#pop'),

            include('punctuation'),
            include('whitespace')
        ],
        'instruction-args': [
            # Fun things
            (r'([\]\[]|BYTE|DWORD|PTR|\+|\-|}|{|\^|>>|<<|&)', Text),

            # Address constants
            (identifier, Name.Constant),
            ('=' + identifier, Name.Constant), # ARM symbol
            (number, Number.Integer),

            # Registers
            ('%' + identifier, Name.Variable),
            ('$' + identifier, Name.Variable),

            # Numeric constants
            ('$' + number, Number.Integer),
            ('#' + number, Number.Integer),

            # ARM predefined constants
            ('#' + identifier, Name.Constant),

            (r"$'(.|\\')'", String.Char),

            (eol, Text, '#pop'),

            include('punctuation'),
            include('whitespace')
        ],
        'whitespace': [
            (r'\n', Text),
            (r'\s+', Text),

            # Block comments
            # /* */ (AT&T)
            (r'/\*.*?\*/', Comment),

            # Line comments
            # //    (AArch64)
            # #     (AT&T)
            # ;     (NASM/intel, LLVM)
            # @     (ARM)
            (r'(//|[#;@]).*$', Comment.Single)
        ],
        'punctuation': [
            (r'[-*,.():]+', Punctuation)
        ]
    }
