import os.path
from mode import Fundamental
import tab
from lex import Grammar, PatternRule, RegionRule, PatternMatchRule, OverridePatternRule
from mode.python import StringGrammar2

chr1   = '[a-zA-Z_]'
chr2   = '[a-zA-Z0-9_]'
word   = chr1 + chr2 + '*'
spaces = r'[\t ]+'

type_ = '[a-zA-Z0-9_<>]+'

class RustGrammar(Grammar):
    rules = [
        PatternRule('spaces', r'[\t ]+'),
        PatternRule('eol', r'\n$'),

        PatternRule('rust.comment', '//.*$'),

        PatternMatchRule('x', r'(fn)( *)(' + word + r')',
                         'rust.keyword', 'spaces', 'rust.function', 'spaces'),

        PatternMatchRule('x', r'(\|)( *)(' + word + r')( *)(\|)',
                         'rust.delimiter', 'spaces', 'rust.param', 'spaces', 'rust.delimiter'),

        PatternMatchRule('x', r'(' + word + ')( *)(:)( *)(&?)(' + type_ + r')',
                         'rust.param', 'spaces', 'rust.delimiter', 'spaces',
                         'rust.delimiter', 'rust.type'),

        PatternMatchRule('x', r'(->)( *)(' + type_ + ')',
                         'rust.operator', 'spaces', 'rust.type'),

        RegionRule('rust.string', '"', StringGrammar2, '"'),

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

        #PatternRule('rust.keyword', r"(?<=[a-zA-Z0-9_])(?:while|where|use|unsafe|type|true|trait|super|struct|static|Self|self|return|ref|pub|mut|move|mod|match|loop|let|in|impl|if|for|fn|false|extern|enum|else|dyn|crate|continue|const|break|await|async|as)"),
        PatternRule('rust.keyword', r"(?<![a-zA-Z0-9_])(?:while|where|use|unsafe|type|true|trait|super|struct|static|Self|self|return|ref|pub|mut|move|mod|match|loop|let|in|impl|if|for|fn|false|extern|enum|else|dyn|crate|continue|const|break|await|async|as)(?![a-zA-Z0-9_])"),

        PatternRule('rust.reserved', r"(?<![a-zA-Z0-9_])(?:yield|virtual|unsized|typeof|try|priv|override|macro|final|do|box|become|abstract)(?![a-zA-Z0-9_])"),

        # weak keywords
        PatternRule('rust.keyword', r"(?<![a-zA-Z0-9_])(?:union|'static)(?![a-zA-Z0-9_])"),

        PatternRule('rust.method', r"(?:fn)(?!" + chr2 + ")"),

        PatternRule('rust.delimiter', r"[;\(\){}\[\]]"),
        PatternRule('rust.delimiter', r"(?:->|\.\.|%|==)"),

        PatternRule('rust.bareword', word),
    ]

class RustTabber(tab.StackTabber2):
    open_tokens        = {'rust.delimiter': {'{': '}', '(': ')', '[': ']'}}
    close_tokens       = {'rust.delimiter': {'}': '{', ')': '(', ']': '['}}
    is_indent_tokens   = set(['spaces'])
    is_ignored_tokens  = set(['spaces', 'eol', 'comment'])
    end_at_eof         = False
    end_at_tokens      = {'rust.delimiter': {';': 1}}
    nocontinue_tokens  = {'rust.delimiter': set([';', ',', '}'])}
    start_free_tokens  = {'rust.string.start': 'rust.string.end'}
    end_free_tokens    = {'rust.string.end': 'rust.string.start'}

# white is for delimiters, operators, numbers
default = ('default', 'default')

# magenta is for keywords/builtins
lo_magenta = ('magenta202', 'default')
hi_magenta = ('magenta505', 'default')

# red is for comments
lo_red = ('red300', 'default')
hi_red = ('red511', 'default')

# orange is for macro definitions, headers and constants
hi_orange = ('yellow531', 'default')
lo_orange = ('yellow520', 'default')

# yellow is for parts of macros
hi_yellow = ('yellow551', 'default')
lo_yellow = ('yellow330', 'default')

# green is for strings and characters
lo_green = ('green030', 'default')
hi_green = ('green050', 'default')

# cyan is for types
lo_cyan = ('cyan033', 'default')
hi_cyan = ('cyan155', 'default')

# blue is definitions, functions and some macros
lo_blue = ('blue113', 'default')
hi_blue = ('blue225', 'default')

class Rust(Fundamental):
    name        = 'rust'
    extensions  = ['.rs']
    grammar     = RustGrammar
    opentokens  = ('delimiter',)
    opentags    = {'(': ')', '[': ']', '{': '}'}
    closetokens = ('delimiter',)
    closetags   = {')': '(', ']': '[', '}': '{'}
    commentc    = '//'
    tabbercls   = RustTabber

    colors      = {
        'rust.comment':            hi_red,
        'rust.comment.start':      hi_red,
        'rust.comment.data':       hi_red,
        'rust.comment.end':        hi_red,

        'rust.param':      lo_yellow,
        'rust.type':      hi_green,
        'rust.delimiter': lo_cyan,
        'rust.operator': lo_cyan,
        #'c.include':  hi_blue,
        #'c.header':   lo_orange,
        'rust.integer': hi_orange,
        #'rust.bareword': lo_cyan,
    }
    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 = Rust.install