summaryrefslogtreecommitdiffstats
path: root/Misc/Vim/vim_syntax.py
blob: 14c551271588aaa705bb83b0d46caeb6c0c8e41a (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
from __future__ import with_statement
# XXX(nnorwitz): what versions of python is this file supposed to work with?
# It uses the old print statement not in py3k.

import keyword
import exceptions
import builtins
from string import Template

comment_header = '''" Auto-generated Vim syntax file for Python.
"
" To use: copy or symlink to ~/.vim/syntax/python.vim'''

statement_header = """
if exists("b:current_syntax")
  finish
endif"""

statement_footer = '''
" Uncomment the 'minlines' statement line and comment out the 'maxlines'
" statement line; changes behaviour to look at least 2000 lines previously for
" syntax matches instead of at most 200 lines
syn sync match pythonSync grouphere NONE "):$"
syn sync maxlines=200
"syn sync minlines=2000

let b:current_syntax = "python"'''

looping = ('for', 'while')
conditionals = ('if', 'elif', 'else')
boolean_ops = ('and', 'in', 'is', 'not', 'or')
import_stmts = ('import', 'from')
object_defs = ('def', 'class')

exception_names = sorted(exc for exc in dir(exceptions)
                                if not exc.startswith('__'))

# Need to include functions that start with '__' (e.g., __import__), but
# nothing that comes with modules (e.g., __name__), so just exclude anything in
# the 'exceptions' module since we want to ignore exceptions *and* what any
# module would have
builtin_names = sorted(builtin for builtin in dir(builtins)
                            if builtin not in dir(exceptions))

escapes = (r'+\\[abfnrtv\'"\\]+', r'"\\\o\{1,3}"', r'"\\x\x\{2}"',
            r'"\(\\u\x\{4}\|\\U\x\{8}\)"', r'"\\$"')

todos = ("TODO", "FIXME", "XXX")

# XXX codify?
numbers = (r'"\<0x\x\+[Ll]\=\>"', r'"\<\d\+[LljJ]\=\>"',
            '"\.\d\+\([eE][+-]\=\d\+\)\=[jJ]\=\>"',
            '"\<\d\+\.\([eE][+-]\=\d\+\)\=[jJ]\=\>"',
            '"\<\d\+\.\d\+\([eE][+-]\=\d\+\)\=[jJ]\=\>"')

contained = lambda x: "%s contained" % x

def str_regexes():
    """Generator to yield various combinations of strings regexes"""
    regex_template = Template('matchgroup=Normal ' +
                                'start=+[uU]\=${raw}${sep}+ ' +
                                'end=+${sep}+ ' +
                                '${skip} ' +
                                '${contains}')
    skip_regex = Template(r'skip=+\\\\\|\\${sep}+')
    for raw in ('', '[rR]'):
        for separator in ("'", '"', '"""', "'''"):
            if len(separator) == 1:
                skip = skip_regex.substitute(sep=separator)
            else:
                skip = ''
            contains = 'contains=pythonEscape' if not raw else ''
            yield regex_template.substitute(raw=raw, sep=separator, skip=skip,
                                            contains = contains)

space_errors = (r'excludenl "\S\s\+$"ms=s+1', r'" \+\t"', r'"\t\+ "')

statements = (
                ('',
                    # XXX Might need to change pythonStatement since have
                    # specific Repeat, Conditional, Operator, etc. for 'while',
                    # etc.
                    [("Statement", "pythonStatement", "keyword",
                        (kw for kw in keyword.kwlist
                            if kw not in (looping + conditionals + boolean_ops +
                                        import_stmts + object_defs))
                      ),
                     ("Statement", "pythonStatement", "keyword",
                         (' '.join(object_defs) +
                             ' nextgroup=pythonFunction skipwhite')),
                     ("Function","pythonFunction", "match",
                         contained('"[a-zA-Z_][a-zA-Z0-9_]*"')),
                     ("Repeat", "pythonRepeat", "keyword", looping),
                     ("Conditional", "pythonConditional", "keyword",
                         conditionals),
                     ("Operator", "pythonOperator", "keyword", boolean_ops),
                     ("PreCondit", "pythonPreCondit", "keyword", import_stmts),
                     ("Comment", "pythonComment", "match",
                         '"#.*$" contains=pythonTodo'),
                     ("Todo", "pythonTodo", "keyword",
                         contained(' '.join(todos))),
                     ("String", "pythonString", "region", str_regexes()),
                     ("Special", "pythonEscape", "match",
                         (contained(esc) for esc in escapes
                             if not '$' in esc)),
                     ("Special", "pythonEscape", "match", r'"\\$"'),
                    ]
                ),
                ("python_highlight_numbers",
                    [("Number", "pythonNumber", "match", numbers)]
                ),
                ("python_highlight_builtins",
                    [("Function", "pythonBuiltin", "keyword", builtin_names)]
                ),
                ("python_highlight_exceptions",
                    [("Exception", "pythonException", "keyword",
                        exception_names)]
                ),
                ("python_highlight_space_errors",
                    [("Error", "pythonSpaceError", "match",
                        ("display " + err for err in space_errors))]
                )
             )

def syn_prefix(type_, kind):
    return 'syn %s %s    ' % (type_, kind)

def fill_stmt(iterable, fill_len):
    """Yield a string that fills at most fill_len characters with strings
    returned by 'iterable' and separated by a space"""
    # Deal with trailing char to handle ' '.join() calculation
    fill_len += 1
    overflow = None
    it = iter(iterable)
    while True:
        buffer_ = []
        total_len = 0
        if overflow:
            buffer_.append(overflow)
            total_len += len(overflow) + 1
            overflow = None
        while total_len < fill_len:
            try:
                new_item = next(it)
                buffer_.append(new_item)
                total_len += len(new_item) + 1
            except StopIteration:
                if buffer_:
                    break
                if overflow:
                    yield overflow
                return
        if total_len > fill_len:
            overflow = buffer_.pop()
            total_len -= len(overflow) - 1
        ret = ' '.join(buffer_)
        assert len(ret) <= fill_len
        yield ret

FILL = 80

def main(file_path):
    with open(file_path, 'w') as FILE:
        # Comment for file
        print>>FILE, comment_header
        print>>FILE, ''
        # Statements at start of file
        print>>FILE, statement_header
        print>>FILE, ''
        # Generate case for python_highlight_all
        print>>FILE, 'if exists("python_highlight_all")'
        for statement_var, statement_parts in statements:
            if statement_var:
                print>>FILE, '  let %s = 1' % statement_var
        else:
            print>>FILE, 'endif'
            print>>FILE, ''
        # Generate Python groups
        for statement_var, statement_parts in statements:
            if statement_var:
                print>>FILE, 'if exists("%s")' % statement_var
                indent = '  '
            else:
                indent = ''
            for colour_group, group, type_, arguments in statement_parts:
                if not isinstance(arguments, basestring):
                    prefix = syn_prefix(type_, group)
                    if type_ == 'keyword':
                        stmt_iter = fill_stmt(arguments,
                                            FILL - len(prefix) - len(indent))
                        try:
                            while True:
                                print>>FILE, indent + prefix + next(stmt_iter)
                        except StopIteration:
                            print>>FILE, ''
                    else:
                        for argument in arguments:
                            print>>FILE, indent + prefix + argument
                        else:
                            print>>FILE, ''

                else:
                    print>>FILE, indent + syn_prefix(type_, group) + arguments
                    print>>FILE, ''
            else:
                if statement_var:
                    print>>FILE, 'endif'
                    print>>FILE, ''
            print>>FILE, ''
        # Associating Python group with Vim colour group
        for statement_var, statement_parts in statements:
            if statement_var:
                print>>FILE, '  if exists("%s")' % statement_var
                indent = '    '
            else:
                indent = '  '
            for colour_group, group, type_, arguments in statement_parts:
                print>>FILE, (indent + "hi def link %s %s" %
                                (group, colour_group))
            else:
                if statement_var:
                    print>>FILE, '  endif'
                print>>FILE, ''
        # Statements at the end of the file
        print>>FILE, statement_footer

if __name__ == '__main__':
    main("python.vim")