#!/usr/bin/env python
# vim:fileencoding=utf-8
from __future__ import (unicode_literals, division, absolute_import,
                        print_function)

__license__ = 'GPL v3'
__copyright__ = '2014, Kovid Goyal <kovid at kovidgoyal.net>'

import io
import os
import tempfile

from tinycss.css21 import CSS21Parser
from tinycss.tests.tokenizing import jsonify
from tinycss.tests import BaseTest

class CoreParser(CSS21Parser):
    """A parser that always accepts unparsed at-rules."""
    def parse_at_rule(self, rule, stylesheet_rules, errors, context):
        return rule

def parse_bytes(css_bytes, kwargs):
    return CSS21Parser().parse_stylesheet_bytes(css_bytes, **kwargs)


def parse_bytesio_file(css_bytes, kwargs):
    css_file = io.BytesIO(css_bytes)
    return CSS21Parser().parse_stylesheet_file(css_file, **kwargs)


def parse_filename(css_bytes, kwargs):
    css_file = tempfile.NamedTemporaryFile(delete=False)
    try:
        css_file.write(css_bytes)
        # Windows can not open the filename a second time while
        # it is still open for writing.
        css_file.close()
        return CSS21Parser().parse_stylesheet_file(css_file.name, **kwargs)
    finally:
        os.remove(css_file.name)


class TestCSS21(BaseTest):

    def test_bytes(self):
        for (css_bytes, kwargs, expected_result, parse) in [
            params + (parse,)
            for parse in [parse_bytes, parse_bytesio_file, parse_filename]
            for params in [
                ('@import "é";'.encode('utf8'), {}, 'é'),
                ('@import "é";'.encode('utf16'), {}, 'é'),  # with a BOM
                ('@import "é";'.encode('latin1'), {}, 'é'),
                ('@import "£";'.encode('Shift-JIS'), {}, '\x81\x92'),  # latin1 mojibake
                ('@charset "Shift-JIS";@import "£";'.encode('Shift-JIS'), {}, '£'),
                (' @charset "Shift-JIS";@import "£";'.encode('Shift-JIS'), {},
                    '\x81\x92'),
                ('@import "£";'.encode('Shift-JIS'),
                    {'document_encoding': 'Shift-JIS'}, '£'),
                ('@import "£";'.encode('Shift-JIS'),
                    {'document_encoding': 'utf8'}, '\x81\x92'),
                ('@charset "utf8"; @import "£";'.encode('utf8'),
                    {'document_encoding': 'latin1'}, '£'),
                # Mojibake yay!
                (' @charset "utf8"; @import "é";'.encode('utf8'),
                    {'document_encoding': 'latin1'}, 'Ã©'),
                ('@import "é";'.encode('utf8'), {'document_encoding': 'latin1'}, 'Ã©'),
            ]
        ]:
            stylesheet = parse(css_bytes, kwargs)
            self.ae(stylesheet.rules[0].at_keyword, '@import')
            self.ae(stylesheet.rules[0].uri, expected_result)

    def test_at_rules(self):
        for (css_source, expected_rules, expected_errors) in [
                (' /* hey */\n', 0, []),
                ('foo {}', 1, []),
                ('foo{} @lipsum{} bar{}', 2,
                 ['unknown at-rule in stylesheet context: @lipsum']),
                ('@charset "ascii"; foo {}', 1, []),
                (' @charset "ascii"; foo {}', 1, ['mis-placed or malformed @charset rule']),
                ('@charset ascii; foo {}', 1, ['mis-placed or malformed @charset rule']),
                ('foo {} @charset "ascii";', 1, ['mis-placed or malformed @charset rule']),
        ]:
            # Pass 'encoding' to allow @charset
            stylesheet = CSS21Parser().parse_stylesheet(css_source, encoding='utf8')
            self.assert_errors(stylesheet.errors, expected_errors)
            self.ae(len(stylesheet.rules), expected_rules)

    def test_core_parser(self):
        for (css_source, expected_rules, expected_errors) in [
                (' /* hey */\n', [], []),

                ('foo{} /* hey */\n@bar;@baz{}',
                 [('foo', []), ('@bar', [], None), ('@baz', [], [])], []),

                ('@import "foo.css"/**/;', [
                    ('@import', [('STRING', 'foo.css')], None)], []),

                ('@import "foo.css"/**/', [
                    ('@import', [('STRING', 'foo.css')], None)], []),

                ('@import "foo.css', [
                    ('@import', [('STRING', 'foo.css')], None)], []),

                ('{}', [], ['empty selector']),

                ('a{b:4}', [('a', [('b', [('INTEGER', 4)])])], []),

                ('@page {\t b: 4; @margin}', [('@page', [], [
                    ('S', '\t '), ('IDENT', 'b'), (':', ':'), ('S', ' '), ('INTEGER', 4),
                    (';', ';'), ('S', ' '), ('ATKEYWORD', '@margin'),
                ])], []),

                ('foo', [], ['no declaration block found']),

                ('foo @page {} bar {}', [('bar', [])],
                 ['unexpected ATKEYWORD token in selector']),

                ('foo { content: "unclosed string;\n color:red; ; margin/**/\n: 2cm; }',
                 [('foo', [('margin', [('DIMENSION', 2)])])],
                 ['unexpected BAD_STRING token in property value']),

                ('foo { 4px; bar: 12% }',
                 [('foo', [('bar', [('PERCENTAGE', 12)])])],
                 ['expected a property name, got DIMENSION']),

                ('foo { bar! 3cm auto ; baz: 7px }',
                 [('foo', [('baz', [('DIMENSION', 7)])])],
                 ["expected ':', got DELIM"]),

                ('foo { bar ; baz: {("}"/* comment */) {0@fizz}} }',
                 [('foo', [('baz', [('{', [
                     ('(', [('STRING', '}')]), ('S', ' '),
                     ('{', [('INTEGER', 0), ('ATKEYWORD', '@fizz')])
                 ])])])],
                 ["expected ':'"]),

                ('foo { bar: ; baz: not(z) }',
                 [('foo', [('baz', [('FUNCTION', 'not', [('IDENT', 'z')])])])],
                 ['expected a property value']),

                ('foo { bar: (]) ; baz: U+20 }',
                [('foo', [('baz', [('UNICODE-RANGE', 'U+20')])])],
                ['unmatched ] token in (']),
        ]:
            stylesheet = CoreParser().parse_stylesheet(css_source)
            self.assert_errors(stylesheet.errors, expected_errors)
            result = [
                (rule.at_keyword, list(jsonify(rule.head)),
                    list(jsonify(rule.body))
                    if rule.body is not None else None)
                if rule.at_keyword else
                (rule.selector.as_css(), [
                    (decl.name, list(jsonify(decl.value)))
                    for decl in rule.declarations])
                for rule in stylesheet.rules
            ]
            self.ae(result, expected_rules)

    def test_parse_style_attr(self):
        for (css_source, expected_declarations, expected_errors) in [
            (' /* hey */\n', [], []),

            ('b:4', [('b', [('INTEGER', 4)])], []),

            ('{b:4}', [], ['expected a property name, got {']),

            ('b:4} c:3', [], ['unmatched } token in property value']),

            (' 4px; bar: 12% ',
                [('bar', [('PERCENTAGE', 12)])],
                ['expected a property name, got DIMENSION']),

            ('bar! 3cm auto ; baz: 7px',
                [('baz', [('DIMENSION', 7)])],
                ["expected ':', got DELIM"]),

            ('foo; bar ; baz: {("}"/* comment */) {0@fizz}}',
                [('baz', [('{', [
                    ('(', [('STRING', '}')]), ('S', ' '),
                    ('{', [('INTEGER', 0), ('ATKEYWORD', '@fizz')])
                ])])],
                ["expected ':'", "expected ':'"]),

            ('bar: ; baz: not(z)',
                [('baz', [('FUNCTION', 'not', [('IDENT', 'z')])])],
                ['expected a property value']),

            ('bar: (]) ; baz: U+20',
                [('baz', [('UNICODE-RANGE', 'U+20')])],
                ['unmatched ] token in (']),
        ]:
            declarations, errors = CSS21Parser().parse_style_attr(css_source)
            self.assert_errors(errors, expected_errors)
            result = [(decl.name, list(jsonify(decl.value)))
                    for decl in declarations]
            self.ae(result, expected_declarations)

    def test_important(self):
        for (css_source, expected_declarations, expected_errors) in [
            (' /* hey */\n', [], []),

            ('a:1; b:2',
                [('a', [('INTEGER', 1)], None), ('b', [('INTEGER', 2)], None)], []),

            ('a:1 important; b: important',
                [('a', [('INTEGER', 1), ('S', ' '), ('IDENT', 'important')], None),
                    ('b', [('IDENT', 'important')], None)],
                []),

            ('a:1 !important; b:2',
                [('a', [('INTEGER', 1)], 'important'), ('b', [('INTEGER', 2)], None)],
                []),

            ('a:1!\t Im\\50 O\\RTant; b:2',
                [('a', [('INTEGER', 1)], 'important'), ('b', [('INTEGER', 2)], None)],
                []),

            ('a: !important; b:2',
                [('b', [('INTEGER', 2)], None)],
                ['expected a value before !important']),

        ]:
            declarations, errors = CSS21Parser().parse_style_attr(css_source)
            self.assert_errors(errors, expected_errors)
            result = [(decl.name, list(jsonify(decl.value)), decl.priority)
                    for decl in declarations]
            self.ae(result, expected_declarations)

    def test_at_import(self):
        for (css_source, expected_rules, expected_errors) in [
            (' /* hey */\n', [], []),
            ('@import "foo.css";', [('foo.css', ['all'])], []),
            ('@import url(foo.css);', [('foo.css', ['all'])], []),
            ('@import "foo.css" screen, print;',
                [('foo.css', ['screen', 'print'])], []),
            ('@charset "ascii"; @import "foo.css"; @import "bar.css";',
                [('foo.css', ['all']), ('bar.css', ['all'])], []),
            ('foo {} @import "foo.css";',
                [], ['@import rule not allowed after a ruleset']),
            ('@page {} @import "foo.css";',
                [], ['@import rule not allowed after an @page rule']),
            ('@import ;',
                [], ['expected URI or STRING for @import rule']),
            ('@import foo.css;',
                [], ['expected URI or STRING for @import rule, got IDENT']),
            ('@import "foo.css" {}',
                [], ["expected ';', got a block"]),
        ]:
            # Pass 'encoding' to allow @charset
            stylesheet = CSS21Parser().parse_stylesheet(css_source, encoding='utf8')
            self.assert_errors(stylesheet.errors, expected_errors)

            result = [
                (rule.uri, rule.media)
                for rule in stylesheet.rules
                if rule.at_keyword == '@import'
            ]
            self.ae(result, expected_rules)

    def test_at_page(self):
        for (css, expected_result, expected_errors) in [
            ('@page {}', (None, (0, 0), []), []),
            ('@page:first {}', ('first', (1, 0), []), []),
            ('@page :left{}', ('left', (0, 1), []), []),
            ('@page\t\n:right {}', ('right', (0, 1), []), []),
            ('@page :last {}', None, ['invalid @page selector']),
            ('@page : right {}', None, ['invalid @page selector']),
            ('@page table:left {}', None, ['invalid @page selector']),

            ('@page;', None, ['invalid @page rule: missing block']),
            ('@page { a:1; ; b: 2 }',
                (None, (0, 0), [('a', [('INTEGER', 1)]), ('b', [('INTEGER', 2)])]),
                []),
            ('@page { a:1; c: ; b: 2 }',
                (None, (0, 0), [('a', [('INTEGER', 1)]), ('b', [('INTEGER', 2)])]),
                ['expected a property value']),
            ('@page { a:1; @top-left {} b: 2 }',
                (None, (0, 0), [('a', [('INTEGER', 1)]), ('b', [('INTEGER', 2)])]),
                ['unknown at-rule in @page context: @top-left']),
            ('@page { a:1; @top-left {}; b: 2 }',
                (None, (0, 0), [('a', [('INTEGER', 1)]), ('b', [('INTEGER', 2)])]),
                ['unknown at-rule in @page context: @top-left']),
        ]:
            stylesheet = CSS21Parser().parse_stylesheet(css)
            self.assert_errors(stylesheet.errors, expected_errors)

            if expected_result is None:
                self.assertFalse(stylesheet.rules)
            else:
                self.ae(len(stylesheet.rules), 1)
                rule = stylesheet.rules[0]
                self.ae(rule.at_keyword, '@page')
                self.ae(rule.at_rules, [])  # in CSS 2.1
                result = (
                    rule.selector,
                    rule.specificity,
                    [(decl.name, list(jsonify(decl.value)))
                        for decl in rule.declarations],
                )
                self.ae(result, expected_result)

    def test_at_media(self):
        for (css_source, expected_rules, expected_errors) in [
            (' /* hey */\n', [], []),
            ('@media  {}', [(['all'], [])], []),
            ('@media all {}', [(['all'], [])], []),
            ('@media screen, print {}', [(['screen', 'print'], [])], []),
            ('@media all;', [], ['invalid @media rule: missing block']),
            ('@media 4 {}', [], ['expected a media type, got INTEGER']),
            ('@media , screen {}', [], ['expected a media type']),
            ('@media screen, {}', [], ['expected a media type']),
            ('@media screen print {}', [],
                ['expected a media type, got IDENT, IDENT']),

            ('@media all { @page { a: 1 } @media; @import; foo { a: 1 } }',
                [(['all'], [('foo', [('a', [('INTEGER', 1)])])])],
                ['@page rule not allowed in @media',
                '@media rule not allowed in @media',
                '@import rule not allowed in @media']),

        ]:
            stylesheet = CSS21Parser().parse_stylesheet(css_source)
            self.assert_errors(stylesheet.errors, expected_errors)

            for rule in stylesheet.rules:
                self.ae(rule.at_keyword, '@media')
            result = [
                (rule.media, [
                    (sub_rule.selector.as_css(), [
                        (decl.name, list(jsonify(decl.value)))
                        for decl in sub_rule.declarations])
                    for sub_rule in rule.rules
                ])
                for rule in stylesheet.rules
            ]
            self.ae(result, expected_rules)
