import os.path
from subprocess import Popen, PIPE, STDOUT
from method.shell import Exec
from mode import Fundamental
import tab
from lex import Grammar, PatternRule, RegionRule, PatternMatchRule, OverridePatternRule
from mode.python import StringGrammar2

class CommentGrammar(Grammar):
    rules = [
        PatternRule(r'data', r'(?:[^\*]|\*(?!/))+'),
    ]

class ErrorGrammar(Grammar):
    rules = [
        PatternRule(r'data', r'[^\\\n]+'),
        PatternRule('continuation', r'\\\n$'),
    ]

chr1 = '[a-zA-Z_]'
chr2 = '[a-zA-Z0-9_]'
word = chr1 + chr2 + '*'

class MacroGrammar(Grammar):
    rules = [
        PatternRule('continuation', r'\\\n$'),
        PatternRule('name', '(?<=#define ) *' + word),
        PatternRule('name', '(?<=#ifdef ) *' + word),
        PatternRule('name', '(?<=#ifndef ) *' + word),
        PatternRule('name', '(?<=#undef ) *' + word),
        PatternRule('concat', '##' + chr2 + '+'),
        PatternRule('quoted', '#' + chr2 + '+'),
        PatternMatchRule('x', r'(defined)(\()(' + word + r')(\))',
                         'function', 'delimiter', 'name', 'delimiter'),
    ]

class CGrammar(Grammar):
    rules = [
        PatternRule('spaces', r' +'),

        PatternMatchRule('x', r'(\()( *)(' + word + r')(\**)( *)(\))( *)(?=[a-zA-Z0-9_\(])',
                         'delimiter', 'spaces', 'c.type', 'c.operator',
                         'spaces', 'delimiter', 'spaces'),

        PatternRule("delimiter", r"\.|\(|\)|\[|\]|{|}|@|,|:|`|;|=(?!=)|\?|->"),
        PatternRule('eol', r"\n$"),
        PatternMatchRule('x', r'(struct|enum|union)( +)(' + word + ')',
                         'c.builtin', 'spaces', 'c.type'),

        PatternRule('c.builtin', r"(?:break|case|continue|default|do|else|for|goto|if|return|sizeof|switch|while)(?!" + chr2 + ")"),
        PatternRule('c.builtin', r"(?:signed|register|extern|const|static|enum|struct|typedef|union|unsigned|volatile)(?!" + chr2 + ")"),
        PatternRule('c.type', r"(?:auto|char|double|float|int|long|short|void|volatile)(?!" + chr2 + ")"),

        PatternMatchRule('x', '(' + word + ')( +)(\**)(' + word + ')( *)(\()',
                         'c.type', 'spaces', 'c.operator', 'c.function',
                         'spaces', 'delimiter'),
        PatternMatchRule('x', '(' + word + ')(\*+)( +)(' + word + ')( *)(\()',
                         'c.type', 'c.operator', 'spaces', 'c.function',
                         'spaces', 'delimiter'),

        PatternMatchRule('x', '(' + word + ')( +)(\**)(' + word + ')',
                         'c.type', 'spaces', 'c.operator', 'c.identifier'),
        PatternMatchRule('x', '(' + word + ')(\*+)( +)(' + word + ')',
                         'c.type', 'c.operator', 'spaces', 'c.identifier'),


        PatternRule('c.function', word + r'(?= *\()'),
        PatternRule('c.constant', "[A-Z_][A-Z0-9_]+(?!" + chr2 + ")"),
        PatternRule('c.label', word + '(?=:)'),
        RegionRule('c.error', '# *error', ErrorGrammar, r'\n$'),
        RegionRule('c.macro', '# *(?:assert|cpu|define|elif|else|endif|error|ident|ifdef|ifndef|if|import|include_next|line|machine|pragma_once|pragma|system|unassert|undef|warning)(?!=' + chr2 + ')', MacroGrammar, r'\n$'),
        RegionRule('c.comment', r'/\*', CommentGrammar, r'\*/'),
        PatternRule('c.comment', '//.*$'),
        RegionRule('c.string', '"', StringGrammar2, '"'),

        PatternRule("c.float", r"-?[0-9]+\.[0-9]*|-?\.[0-9]+|-?(?:[0-9]|[0-9]+\.[0-9]*|-?\.[0-9]+)[eE][\+-]?[0-9]+"),
        PatternRule("c.integer", r"(?:0(?![x0-9])|-?[1-9][0-9]*|0[0-7]+|0[xX][0-9a-fA-F]+)[lL]?"),

        PatternRule("c.operator", r"!(?!=)|\+=|-=|\*=|/=|//=|%=|&=\|\^=|>>=|<<=|\*\*="),
        PatternRule('c.operator', r"\+|<>|<<|<=|<|-|>>|>=|>|\*\*|&|\*|\||/|\^|==|//|~|!=|%"),
        RegionRule('c.macrocomment', '#if +(?:0|NULL|FALSE)', Grammar, '#endif'),
        PatternRule('c.char', r"'.'|'\\.'|'\\[0-7]{3}'"),
        PatternMatchRule('x', r'(# *include)( +)(.+)(\n|$)',
                         'c.macro.start', 'spaces', 'c.header', 'c.macro.end'),
        PatternRule('c.identifier', word),
        OverridePatternRule('c.comment', r'/\* *@@:(?P<token>[.a-zA-Z0-9_]+):(?P<mode>[.a-zA-Z0-9_]+) *\*/$'),
        OverridePatternRule('c.comment', r'// *@@:(?P<token>[.a-zA-Z0-9_]+):(?P<mode>[.a-zA-Z0-9_]+) *$'),
    ]

MacroGrammar.rules.extend(CGrammar.rules)

class CTabber2(tab.StackTabber2):
    open_tokens        = {'delimiter': {'{': '}', '(': ')', '[': ']'}}
    close_tokens       = {'delimiter': {'}': '{', ')': '(', ']': '['}}
    control_tokens     = {'c.keyword': {'if': 1, 'else': 1, 'while': 1, 'do': 1, 'for': 1}}
    end_at_eof         = False
    end_at_tokens      = {'delimiter': {';': 1}}
    nocontinue_tokens  = {'delimiter': {';': 1, ',': 1}}
    start_free_tokens  = {'c.string.start': 'c.string.end'}
    end_free_tokens    = {'c.string.end': 'c.string.start'}
    start_macro_tokens = {'c.macro.start': 'c.macro.end'}
    end_macro_tokens   = {'c.macro.end': 'c.macro.start'}
    def is_base(self, y):
        if y == 0:
            return True
        tokens = self._get_tokens(y)

        # this assumes that people aren't gonna use these macros inside of
        # blocks, which is probably ok.
        t = tokens[0]
        if t.fqmatchs('c.macro.start', '#define', '#include'):
            return True
        
        # detecting function declarations is annoying; this assumes that people
        # won't put a variable type and name on different lines, but that they
        # might do that for function return type and name.
        #
        # unfortunately, valid function return types might include any of the
        # four types of tokens below
        decl = False
        for t in tokens:
            if t.isa('c.keyword', 'c.identifier', 'c.type'):
                decl = True
                continue
            if decl and t.name == 'c.function':
                break
            else:
                decl = False
                break
        return decl
    def _is_indent(self, t):
        return t.name == 'spaces'
    def _is_ignored(self, t):
        return t.fqisa('spaces', 'eol', 'c.comment', 'c.comment.start',
                       'c.comment.data', 'c.comment.null', 'c.comment.end')
        #return t.fqname() in ('spaces', 'eol', 'c.comment', 'c.comment.start',
        #                      'c.comment.data', 'c.comment.null',
        #                      'c.comment.end')

class CCheckSyntax(Exec):
    '''Build this C program (using the mode's make cmd)'''
    show_success = False
    args = []
    def _execute(self, w, **vargs):
        if w.application.config['c.syntax-rel-dir']:
            d = os.path.dirname(w.buffer.path)
            self._doit(w, w.buffer.path, w.application.config['c.syntax-cmd'],
                       cmdname='c-check-syntax', cmddir=d)
        else:
            self._doit(w, w.buffer.path, w.application.config['c.syntax-cmd'],
                       cmdname='c-check-syntax')

class CMake(Exec):
    '''Build this C program (using the mode's make cmd)'''
    show_success = False
    args = []
    def _execute(self, w, **vargs):
        if w.application.config['c.make-rel-dir']:
            d = os.path.dirname(w.buffer.path)            
            self._doit(w, w.buffer.path, w.application.config['c.make-cmd'],
                       cmdname='c-make', cmddir=d)
        else:
            self._doit(w, w.buffer.path, w.application.config['c.make-cmd'],
                       cmdname='c-make')

class C(Fundamental):
    name        = 'C'
    extensions  = ['.c', '.h', '.cpp']
    tabbercls   = CTabber2
    grammar     = CGrammar
    opentokens  = ('delimiter',)
    opentags    = {'(': ')', '[': ']', '{': '}'}
    closetokens = ('delimiter',)
    closetags   = {')': '(', ']': '[', '}': '{'}
    actions     = [CCheckSyntax, CMake]
    format      = "%(flag)s  %(bname)s  (%(mname)s)  %(indent)s  %(cursor)s  %(perc)s  [%(func)s]"
    commentc    = '//'

    colors      = {
        #'c.identifier':       ('yellow', 'default', 'bold'),
        'macrocomment.start': ('red', 'default', 'bold'),
        'macrocomment.null':  ('red', 'default', 'bold'),
        'macrocomment.end':   ('red', 'default', 'bold'),
        'macro':              ('blue', 'default', 'bold'),
        'macro.start':        ('blue', 'default', 'bold'),
        'macro.name':         ('yellow', 'default', 'bold'),
        'macro.null':         ('magenta', 'default', 'bold'),
        'macro.continued':    ('red', 'default', 'bold'),
        'macro.delimiter':    ('default', 'default', 'bold'),
        'macro.concat':       ('yellow', 'default', 'bold'),
        'macro.quoted':       ('yellow', 'default', 'bold'),
        'include':            ('blue', 'default', 'bold'),
        'header':             ('green', 'default', 'bold'),
        'type':               ('cyan', 'default', 'bold'),
        'constant':           ('yellow', 'default', 'bold'),
        'error.start':        ('blue', 'default', 'bold'),
        'error.data':         ('green', 'default', 'bold'),
        'error.null':         ('green', 'default', 'bold'),
    }
    config = {
        'c.syntax-cmd':     "gcc -x c -fsyntax-only %(path)s",
        'c.syntax-rel-dir': False,
        'c.make-cmd':       "make",
        'c.make-rel-dir':   True,
    }
    lconfig = {
        'ignore-suffix': ['.o'],
    }

    _bindings = {
        'close-paren':    (')',),
        'close-brace':    ('}',),
        'close-bracket':  (']',),
        'c-check-syntax': ('C-c s',),
        'c-make':         ('C-c C-c',),
    }

    def get_functions(self): return {}
    def get_function_names(self): return []
    def get_line_function(self, y): return None
    def get_status_names(self):
        names = Fundamental.get_status_names(self)
        c = self.window.logical_cursor()
        names['func'] = self.get_line_function(c.y)
        return names

install = C.install