from method import Argument, Method
from mode import Fundamental
from lex import Grammar, PatternRule, RegionRule
import re

class TalGrammar(Grammar):
    rules = [
        PatternRule('spaces', '[ \t]+'),
        RegionRule('comment', r'\((?:[ \t]|$)', Grammar, '(?:^|[ \t])\)'),
        PatternRule('delimiter', r'[\[\]{}]'),
        PatternRule('tal.inst', r'(BRK|LIT|INC|POP|DUP|NIP|SWP|OVR|ROT|EQU|NEQ|GTH|LTH|JMP|JCN|JSR|STH|LDZ|STZ|LDR|STR|LDA|STA|DEI|DEO|ADD|SUB|MUL|DIV|AND|ORA|EOR|SFT)2?k?r?'), # instructions
        PatternRule('tal.defmacro', r'%[^ \t\n]+'), # macro-define
        PatternRule('tal.pad', r'\|[^ \t\n]+'), # pad (absolute)
        PatternRule('tal.pad', r'\$[^ \t\n]+'), # pad (relative)
        PatternRule('tal.deflabel', r'@[^ \t\n]+'), # label-define
        PatternRule('tal.defsublabel', r'&[^ \t\n]+'), # sublabel-define
        PatternRule('tal.spacer', r'/[^ \t\n]+'), # sublabel-spacer
        PatternRule('tal.number', r'#[0-9a-fA-F]+'), # literal number
        PatternRule('tal.addr', r'\.[^/ \t\n]+'), # little addr (zero page)
        PatternRule('tal.addr', r',[^/ \t\n]+'), # little addr (relative)
        PatternRule('tal.addr', r';[^/ \t\n]+'), # little addr (absolute)
        PatternRule('tal.addr', r':[^/ \t\n]+'), # raw addr
        PatternRule('tal.addr', r'\'[^/ \t\n]+'), # raw char
        PatternRule('tal.addr', r'\"[^/ \t\n]+'), # raw word
        PatternRule('tal.word', r'[^ \t\n]+'),
        PatternRule('eol', '\n'),
    ]

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

# magenta is for keywords/builtins
lo_magenta = ('magenta202', 'default')
hi_magenta = ('magenta414', '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 Taldoc(Method):
    '''View documentation'''
    ops = {
        # instructions
        'BRK': ['Break', [[], []], None, 'halt the program'],
        'LIT': ['Literal', [[], ['a']], None, 'push the next value onto the stack'],
        'INC': ['Increment', [['a'] , ['b']], None, 'adds one to the top of the stack'],
        'POP': ['Pop', [['a'], []], None, 'remove the top of the stack'],
        'DUP': ['Duplicate', [['a'], ['a', 'a']], None, 'duplicate the top of the stack'],
        'NIP': ['Nip', [['a', 'b'], ['b']], None, 'remove the second value (a)'],
        'SWP': ['Swap', [['a', 'b'], ['b', 'a']], None, 'swap the top two stack values'],
        'OVR': ['Over', [['a', 'b'], ['a', 'b', 'a']], None, 'duplicate the second value (a) to the top of the stack'],
        'ROT': ['Rotate', [['a', 'b', 'c'], ['b', 'c', 'a']], None, 'rotate the top three values to the left'],
        # logic
        'EQU': ['Equal', [['a', 'b'], ['bool^']], None, 'push 01 if a == b; push 00 otherwise'],
        'NEQ': ['Not Equal', [['a', 'b'], ['bool^']], None, 'push 01 if a != b; push 00 otherwise'],
        'GTH': ['Greater Than', [['a', 'b'], ['bool^']], None, 'push 01 if a > b; push 00 otherwise'],
        'LTH': ['Less Than', [['a', 'b'], ['bool^']], None, 'push 01 if a < b; push 00 otherwise'],
        # control flow
        'JMP': ['Jump', [['x'], []], None, 'modify the pc using addr'],
        'JCN': ['Jump Conditional', [['bool^ addr'], []], None, 'if bool != 00, modify the pc using addr'],
        'JSR': ['Jump Stash Return', [['addr'], []], [[], ['pc']], 'store pc onto return stack; modify pc using addr'],
        'STH': ['Stash', [['a'], []], [[], ['a']], 'move the top of the stack to the return stack'],
        # memory
        'LDZ': ['Load Zero-Page', [['addr^'], ['val']], None, 'load value from first 256 bytes of memory onto the stack'],
        'STZ': ['Store Zero-Page', [['val', 'addr^'], []], None, 'write top of stack into the first 256 bytes of memory'],
        'LDR': ['Load Relative', [['addr^'], ['val']], None, 'load relative address onto the stack'],
        'STR': ['Store Relative', [['val', 'addr^'], []], None, 'write top of stack to relative address'],
        'LDA': ['Load Absolute', [['addr*'], ['val']], None, 'load absolute address onto the stack'],
        'STA': ['Store Absolute', [['val', 'addr*'], []], None, 'write top of stack to absolute address'],
        'DEI': ['Device In', [['addr^'], ['val']], None, 'load from the given device onto the stack'],
        'DEO': ['Device Out', [['val', 'addr^'], []], None, 'write top of stack to the given device'],
        # arithmetic
        'ADD': ['Add', [['a', 'b'], ['a+b']], None, 'addition (a + b)'],
        'SUB': ['Subtract', [['a', 'b'], ['a-b']], None, 'subtraction (a - b)'],
        'MUL': ['Multiply', [['a', 'b'], ['a*b']], None, 'multiplication (a * b)'],
        'DIV': ['Divide', [['a', 'b'], ['a/b']], None, 'division (a / b)'],
        # bitwise
        'AND': ['And', [['a', 'b'], ['a&b']], None, 'bitwise-and (a & b)'],
        'ORA': ['Or', [['a', 'b'], ['a|b']], None, 'bitwise-or (a | b)'],
        'EOR': ['Exclusive Or', [['a', 'b'], ['a^b']], None, 'bitwise-xor (a ^ b)'],
        'SFT': ['Shift', [['a', 'b^'], ['c']], None, 'bitshift left (b >> 4) then right (b & 0xf)'],
    }
    inst_re = re.compile(r'^([A-Z]{3})(2?k?r?)$')
    addr_dict = {
        '.': 'zero-page address',
        ',': 'relative address',
        ';': 'absolute address',
        ':': 'raw address',
        '\'': 'raw character',
        '\"': 'raw word',
    }
    def find_macro(self, name, w):
        toks = w.get_highlighter().tokens
        target = '%' + name
        found = False
        start = None
        end = None
        defn = None
        for line in toks:
            for t in line:
                if not found:
                    found = t.name == "tal.defmacro" and t.string == target
                elif start is None:
                    if t.name == 'delimiter' and t.string == '{':
                        start = (t.x + 1, t.y)
                elif end is None:
                    if t.name == 'delimiter' and t.string == '}':
                        end = (t.x, t.y)
                        break
        if start is None or end is None:
            return None
        (sx, sy) = start
        (ex, ey) = end
        lines = w.buffer.lines
        if sy == ey:
            # 1 lines
            return lines[sy][sx:ex]
        elif sy == ey + 1:
            # 2 lines
            return lines[sy][sx:] + ' ' + lines[ey][:e.x]
        else:
            # 3+ lines
            out = []
            out.append(lines[sy][sx:])
            out.extend(lines[sy+1:ey])
            out.append(lines[ey][:ex])
            return ' '.join(out)
    def _execute(self, w, **vargs):
        tok = w.get_token()
        word = tok.string
        if word is None:
            w.set_error('no word selected')
            return
        m = self.inst_re.match(word)
        if m and m.group(1) in self.ops:
            prefix, suffix = m.groups()
            glyph = '^'
            name, ds, rs, desc = self.ops[prefix]
            if 'r' in suffix:
                rs, ds = ds, rs
            if '2' in suffix:
                glyph = '*'
            if 'k' in suffix:
                ds = [ds[0], ds[0] + ds[1]]
            def mark(x):
                if x.endswith('^') or x.endswith('*'):
                    return x
                else:
                    return x + glyph
            def stk(xss):
                return ' -- '.join([' '.join([mark(x) for x in xs]) for xs in xss])
            if rs is None:
                msg = '%s (%s) %s: %s' % (word, stk(ds), name, desc)
            elif ds is None:
                msg = '%s {%s} %: %s' % (word, stk(rs), name, desc)
            else:
                msg = '%s (%s) {%s} %s: %s' % (word, stk(ds), stk(rs), name, desc)
            w.set_error(msg)
        elif tok.name == 'tal.number':
            n = int(word[1:], 16)
            w.set_error('%r is a number (%d)' % (word, n))
        elif tok.name == 'tal.defmacro':
            w.set_error('%r is a macro definition' % word)
        elif tok.name == 'tal.pad':
            n = int(word[1:], 16)
            if word[0] == '|':
                w.set_error('%r is an absolute pad (%d)' % (word, n))
            else:
                w.set_error('%r is a relative pad (+%d)' % (word, n))
        elif tok.name == 'tal.deflabel':
            w.set_error('%r is a label definition' % word)
        elif tok.name == 'tal.defsublabel':
            w.set_error('%r is a sublabel definition' % word)
        elif tok.name == 'tal.addr':
            kind = self.addr_dict.get(word[0], 'unknown address')
            w.set_error('%r is a %s' % (word, kind))
        else:
            defn = self.find_macro(word, w)
            if defn is None:
                w.set_error('%r is not recognized' % word)
            else:
                w.set_error('%r is a macro: %s' % (word, defn))


class Tal(Fundamental):
    name       = 'tal'
    extensions = ['.tal']
    grammar    = TalGrammar
    actions = [Taldoc]
    colors     = {
        'tal.addr':        hi_cyan,
        'tal.defmacro':    hi_blue,
        'tal.addr':        hi_yellow,
        'tal.inst':        hi_magenta,
        'tal.deflabel':    hi_blue,
        'tal.defsublabel': hi_cyan,
        'tal.number':      hi_green,
        'tal.pad':         hi_orange,
        'tal.spacer':      hi_orange,
    }
    opentokens  = ('delimiter',)
    opentags    = {'(': ')', '[': ']', '{': '}'}
    closetokens = ('delimiter',)
    closetags   = {')': '(', ']': '[', '}': '{'}
    _bindings = {
        'taldoc': ('C-c p',),
        'close-paren':   (')',),
        'close-brace':   ('}',),
        'close-bracket': (']',),
    }

install = Tal.install