from mode import Fundamental
from lex import Grammar, PatternRule, RegionRule, PatternMatchRule
from mode.python import StringGrammar1, StringGrammar2, StringGrammar3, StringGrammar4
from method import Method, arg

from subprocess import Popen, PIPE, STDOUT

chr1 = '[a-zA-Z_.?]'
chr2 = '[a-zA-Z0-9_.?$#@~]'
word = chr1 + chr2 + '*'

class NasmGrammar(Grammar):
    rules = [
        PatternRule('comment', ';.*$'),
        RegionRule('comment', '%if +0', Grammar, r'%%endif'),

        # for use with ndisasm files
        PatternMatchRule('x', '^([0-9a-fA-F]{8})(  )([0-9a-fA-F]+)', 'nasm.integer', 'spaces', 'nasm.address'),
        PatternRule('nasm.address', '^[0-9a-fA-F]{8}  [0-9a-fA-F]+'),

        PatternRule('spaces', ' +'),
        PatternRule("nasm.integer", "(0[xX][0-9a-fA-F]+|0|[1-9][0-9]*|0[0-7]+)[lL]?"),
        PatternRule('nasm.register', "(?:eax|ebx|ecx|edx|ax|ah|al|bx|bh|bl|bp|cx|ch|cl|cmpsb|dh|di|dl|ds|dx|esi|es|edi|esp|ebp|si|sp|stosd)(?!" + chr2 + ")"),
        PatternRule('nasm.pseudo', "(?:a16|a32|byte|db|dd|do|dq|dt|dword|qword|tword|fs|gs|near|o16|o32|short)(?!" + chr2 + ")"),
        PatternRule('nasm.instruction', "(?:jg|jeq|jecxz|jne|ja|jmp|push|pushad|pushfd|call|ret|sub|adc|add|popad|popaw|popa|popfd|pop|call|and|arpl|bound|cwd|cdq|clc|cld|cli|cmp|cmpxchg|cpuid|das|dec|divpd|div|enter|leave|fadd|fld|fmul|fsqrt|fsub|fs|hlt|imul|inc|insb|insd|insw|ins|int|int3|in|jcxz|jc|jna|jnc|jnz|jo|js|jz|lea|lldt|loadsb|lock|loopne|movzx|movd|mov|mul|neg|not|nop|or|outsb|outsd|outsw|repe|retf|rol|sal|sar|sbb|scasw|shl|shr|shld|shrd|sldt|syscall|sysenter|sysexit|test|xchg|xadd|xor)(?!" + chr2 + ")"),
        PatternRule('nasm.macro', "\%(?:define|undef|assign|strlen|macro|endmacro|if|elif|else|endif|ifdef|ifndef|include|push|pop|stacksize)(?!" + chr2 + ")"),
        PatternRule('nasm.keyword', "(?:section|global|extern)(?!" + chr2 + ")"),
        PatternRule('nasm.prefix', "(?:dword|word|lock)(?!" + chr2 + ")"),
        PatternMatchRule('x', '(' + word + ')(:)', 'nasm.label', 'delimiter'),
        PatternRule("nasm.identifier", r'\$?' + word),
        PatternRule("nasm.float", r"[0-9]+\.[0-9]*|\.[0-9]+|([0-9]|[0-9]+\.[0-9]*|\.[0-9]+)[eE][\+-]?[0-9]+"),
        PatternRule('delimiter', r'(?://|%%|<<|>>|[~!\.\*/%\-\+\(\)\[\],\|\^\&])'),
        # TODO: nasm strings seem like they are single-line only
        RegionRule('string', '"""', StringGrammar4, '"""'),
        RegionRule('string', "'''", StringGrammar3, "'''"),
        RegionRule('string', '"', StringGrammar2, '"'), 
        RegionRule('string', "'", StringGrammar1, "'"),
        PatternRule('eol', '\n'),
        PatternRule('continuation', r'\\\n$'),
    ]

class NasmDisassembleFile(Method):
    args = [arg("path", dt='path', p="Path: "),
            arg('flags', p='Flags: ', dv=lambda w: '-b 16', ld=True)]
    def _execute(self, w, **vargs):
        p = Popen(['ndisasm', vargs['path']], stdout=PIPE, stderr=STDOUT)
        output   = p.stdout.read()
        retval   = p.wait()
        modename = None
        bufname  = '*Disasm:%s*' % vargs['path']
        w.application.data_buffer(bufname, output, switch_to=True,
                                  modename=modename)

class Nasm(Fundamental):
    name       = 'nasm'
    extensions = ['.s']
    grammar    = NasmGrammar
    commentc   = ';'
    colors     = {
        'nasm.address':     ('cyan', 'default'),
        'nasm.pseudo':      ('cyan', 'default'),
        'nasm.keyword':     ('cyan', 'default'),
        'nasm.macro':       ('blue', 'default'),
        'nasm.register':    ('yellow', 'default'),
        'nasm.instruction': ('magenta', 'default'),
        'nasm.label':       ('blue', 'default'),
        'nasm.integer':     ('green', 'default'),
    }
    _bindings = {
        'close-paren':   (')',),
        'close-brace':   ('}',),
        'close-bracket': (']',),
    }
    actions = [NasmDisassembleFile]

install = Nasm.install