import os, re
from subprocess import Popen, PIPE, STDOUT
import color, default, method, method.shell, mode, 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$'),
    ]

class MacroGrammar(Grammar):
    rules = [
        PatternRule('continuation', r'\\\n$'),
        PatternRule('name', r'(?<=#define ) *[a-zA-Z_][a-zA-Z0-9_]*'),
        PatternRule('name', r'(?<=#ifdef ) *[a-zA-Z_][a-zA-Z0-9_]*'),
        PatternRule('name', r'(?<=#ifndef ) *[a-zA-Z_][a-zA-Z0-9_]*'),
        PatternRule('name', r'(?<=#undef ) *[a-zA-Z_][a-zA-Z0-9_]*'),
        PatternRule(r'concat', r'##[a-zA-Z0-9_]+'),
        PatternRule(r'quoted', r'#[a-zA-Z0-9_]+'),
        PatternMatchRule(r'xyz', r'(defined)(\()([a-zA-Z_][a-zA-Z0-9_]*)(\))',
                         r'function', r'delimiter', r'name', r'delimiter'),
    ]

class CGrammar(Grammar):
    rules = [
        PatternRule(r'spaces', r' +'),
        PatternRule(r"delimiter", r"\.|\(|\)|\[|\]|{|}|@|,|:|`|;|=(?!=)|\?|->"),
        PatternRule(r'eol', r"\n$"),
        PatternMatchRule(r'x', r'(struct|enum|union)( +)([a-zA-Z_][a-zA-Z0-9_]*)',
                         r'builtin', r'spaces', r'type'),

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

        PatternMatchRule(r'x', r'([a-zA-Z_][a-zA-Z0-9_]*)(\**)( +)(\**)([a-zA-Z_][a-zA-Z0-9_]*)',
                         r'type', r'spaces', r'binop', r'spaces', r'identifier'),

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

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

        PatternRule(r"operator", r"!(?!=)|\+=|-=|\*=|/=|//=|%=|&=\|\^=|>>=|<<=|\*\*="),
        PatternRule(r'operator', r"\+|<>|<<|<=|<|-|>>|>=|>|\*\*|&|\*|\||/|\^|==|//|~|!=|%"),
        RegionRule(r'macrocomment', r'#if +(?:0|NULL|FALSE)', Grammar, r'#endif'),
        PatternRule(r'char', r"'.'|'\\.'|'\\[0-7]{3}'"),
        PatternMatchRule(r'x', r'(# *include)( +)(.+)(\n|$)',
                         r'macro.start', r'spaces', r'header', r'macro.end'),
        PatternRule(r'identifier', r"[a-zA-Z_][a-zA-Z0-9_]*"),
        OverridePatternRule(r'comment', r'/\* *@@:(?P<token>[.a-zA-Z0-9_]+):(?P<mode>[.a-zA-Z0-9_]+) *\*/$'),
        OverridePatternRule(r'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     = {'keyword': {'if': 1, 'else': 1, 'while': 1, 'do': 1, 'for': 1}}
    end_at_eof         = False
    end_at_tokens      = {'delimiter': {';': 1}}
    nocontinue_tokens  = {'delimiter': {';': 1}}
    start_free_tokens  = {'string.start': 'string.end'}
    end_free_tokens    = {'string.end': 'string.start'}
    start_macro_tokens = {'macro.start': 'macro.end'}
    end_macro_tokens   = {'macro.end': '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.fqname() == 'macro.start' and t.string in ('#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.name in ('keyword', 'identifier', 'structname', 'enumname'):
                decl = True
                continue
            if decl and t.name == 'function':
                break
            else:
                decl = False
                break
        return decl
    def _is_indent(self, t):
        return t.name == 'spaces'
    def _is_ignored(self, t):
        return t.fqname() in ('spaces', 'eol', 'comment', 'comment.start',
                              'comment.data', 'comment.null', 'comment.end')

class CCheckSyntax(method.shell.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(method.shell.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(mode.Fundamental):
    name        = 'C'
    extensions  = ['.c', '.h', '.cpp']
    tabbercls   = CTabber2
    grammar     = CGrammar
    opentokens  = ('delimiter',)
    opentags    = {'(': ')', '[': ']', '{': '}'}
    closetokens = ('delimiter',)
    closetags   = {')': '(', ']': '[', '}': '{'}
    actions     = [CCheckSyntax, CMake]
    format      = "%(flag)s  %(bname)-18s  (%(mname)s)  %(indent)s  %(cursor)s/%(mark)s  %(perc)s  [%(func)s]"
    commentc    = '//'

    colors      = {
        '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_status_names(self):
        names = mode.Fundamental.get_status_names(self)
        c = self.window.logical_cursor()
        names['func'] = self.get_line_function(c.y)
        return names

    def get_functions(self):
        return {}
    def get_function_names(self):
        return []
    def get_line_function(self, y):
        return None

install = C.install