import code, re, string, StringIO, sys, traceback
import buffer, color, completer, lex, method, mode, mode.mini, mode.consolemini, window
from subprocess import Popen, PIPE, STDOUT
#from lex import Grammar, PatternRule
from mode.perl import PerlGrammar
from point import Point

PAD   = '   '
LIMIT = 79

class IperlExec(method.Method):
    def _execute(self, w, **vargs):
        s = w.buffer.make_string()
        w.mode.history[-1] = s
        w.mode.history.append('')
        w.buffer.set_data('')
        w.mode.hindex = len(w.mode.history) - 1

        a = w.application
        if not a.has_buffer_name('*IPerl*'):
            raise Exception, "No iperl found!"
        b = a.bufferlist.get_buffer_by_name('*IPerl*')
        if a.window().buffer is not b:
            a.switch_buffer(b)
        p = a.get_mini_buffer_prompt()
        b.insert_string(b.get_buffer_end(), p + s + '\n', force=True)

        w.mode.pipe.stdin.write("ENTER:%s\n" % s)
        w.mode.pipe.stdin.flush()
        output = w.mode._read()
        b.insert_string(b.get_buffer_end(), output, force=True)

class IperlTab(method.Method):
    def execute(self, w, **vargs):
        a = w.application
        s = w.buffer.make_string()

        x = w.logical_cursor().x
        if not s or s[:x].isspace():
            w.insert_string_at_cursor(' ' * w.mode.tabwidth)
            return

        l = lex.Lexer(w.mode, PerlGrammar)
        tokens = list(l.lex([s]))

        t = None
        for t2 in tokens:
            if t2.x < x and t2.end_x() >= x:
                t = t2
                break
        if t is None:
            return

        s = t.string
        w.mode.pipe.stdin.write("COMPLETE:%s\n" % s)
        w.mode.pipe.stdin.flush()
        (typ_, value) = w.mode._readline()
        assert typ_ == 'COMPLETIONS'

        candidates = [x for x in value.split('|') if x]
        w.mode._read()

        if candidates:
            s = completer.find_common_string(candidates)
            w.buffer.delete(Point(t.x, 0), Point(t.end_x(), 0), force=True)
            w.insert_string_at_cursor(s)
        mode.mini.use_completion_window(a, s, candidates)

class IperlStart(method.Method):
    '''Evaluate python expressions (for advanced use and debugging only)'''
    def execute(self, w, **vargs):
        a = w.application
        if not a.has_buffer_name('*IPerl*'):
            b = buffer.IperlBuffer()
            a.add_buffer(b)
            window.Window(b, a)
        b = a.bufferlist.get_buffer_by_name('*IPerl*')
        if a.window().buffer is not b:
            a.switch_buffer(b)
        f = lambda x: None
        w.application.open_mini_buffer('*** ', f, self, None, 'iperlmini')

class IperlPageUp(mode.consolemini.ConsolePageUp):
    subbuf = '*IPerl*'
class IperlPageDown(mode.consolemini.ConsolePageDown):
    subbuf = '*IPerl*'
class IperlGotoBeginning(mode.consolemini.ConsoleGotoBeginning):
    subbuf = '*IPerl*'
class IperlGotoEnd(mode.consolemini.ConsoleGotoEnd):
    subbuf = '*IPerl*'

class IperlMini(mode.Fundamental):
    modename = 'IperlMini'
    actions  = [IperlExec, IperlTab, IperlStart,
                IperlPageUp, IperlPageDown, IperlGotoBeginning, IperlGotoEnd]
    readre = re.compile('^([A-Z]+):(.*)\n$')
    def _readline(self):
        line = self.pipe.stdout.readline()
        m = self.readre.match(line)
        if m:
            return (m.group(1), m.group(2))
        else:
            return ('RAW', line.rstrip())
    def _read(self):
        output = []
        while True:
            (type_, value) = self._readline()
            if type_ == 'PROMPT':
                self.window.application.set_mini_buffer_prompt(value + ' ')
                break
            if type_ in ('ERROR', 'RESULT'):
                value = value.replace('\\n', '\n').replace('\\\\', '\\')
            value.rstrip()
            if value:
                output.append(value)
        if output:
            return '\n'.join(output) + '\n'
        else:
            return ''

    def __init__(self, w):
        mode.Fundamental.__init__(self, w)
        self.bindings    = {}
        self.history = ['']
        self.hindex  = 0

        cmd = ('iperl', '-p')
        f = open('/dev/null', 'w')
        self.pipe = Popen(cmd, stdin=PIPE, stdout=PIPE, stderr=f)
        (type_, value) = self._readline()
        assert type_ == 'PROMPT', type_
        w.application.set_mini_buffer_prompt('%s ' % value.strip())

        self.add_bindings('start-of-line', ('C-a', 'HOME',))
        self.add_bindings('end-of-line', ('C-e', 'END',))
        self.add_bindings('backward', ('C-b', 'L_ARROW',))
        self.add_bindings('forward', ('C-f', 'R_ARROW',))
        self.add_bindings('delete-left', ('DELETE', 'BACKSPACE',))
        self.add_bindings('delete-left-word', ('M-DELETE', 'M-BACKSPACE',))
        self.add_bindings('delete-right', ('C-d',))
        self.add_bindings('delete-right-word', ('M-d',))
        self.add_bindings('kill-region', ('C-w',))
        self.add_bindings('copy-region', ('M-w',))
        self.add_bindings('kill', ('C-k',))
        self.add_bindings('copy', ('M-k',))
        self.add_bindings('yank', ('C-y',))
        self.add_bindings('pop-kill', ('M-y',))
        self.add_bindings('right-word', ('M-f',))
        self.add_bindings('left-word', ('M-b',))
        self.add_bindings('set-mark', ('C-@',))
        self.add_bindings('switch-mark', ('C-x C-x',))
        self.add_bindings('undo', ('C-/', 'C-x u',))
        self.add_bindings('redo', ('M-/', 'M-_', 'C-x r',))
        self.add_bindings('toggle-margins', ('M-m',))
        self.add_bindings('transpose-words', ('M-t',))
        self.add_bindings('delete-left-whitespace', ('C-c DELETE', 'C-c BACKSPACE',))
        self.add_bindings('delete-right-whitespace', ('C-c d',))
        self.add_bindings('insert-space', ('SPACE',))
        self.add_bindings('iperl-exec', ('RETURN',))
        self.add_bindings('console-clear', ('C-l',))
        self.add_bindings('console-cancel', ('C-]',))
        self.add_bindings('console-history-prev', ('C-p',))
        self.add_bindings('console-history-next', ('C-n',))
        self.add_bindings('iperl-tab', ('TAB',))
        self.add_bindings('iperl-page-up', ('M-v',))
        self.add_bindings('iperl-page-down', ('C-v',))
        self.add_bindings('iperl-goto-beginning', ('M-<',))
        self.add_bindings('iperl-goto-end', ('M->',))
        for c in string.letters + string.digits + string.punctuation:
            self.add_binding('insert-string-%s' % c, c)

install = IperlMini.install