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"""
pygments.lexers.fantom
~~~~~~~~~~~~~~~~~~~~~~
Lexer for the Fantom language.
:copyright: Copyright 2006-2021 by the Pygments team, see AUTHORS.
:license: BSD, see LICENSE for details.
"""
from string import Template
from pygments.lexer import RegexLexer, include, bygroups, using, \
this, default, words
from pygments.token import Text, Comment, Operator, Keyword, Name, String, \
Number, Punctuation, Literal, Whitespace
__all__ = ['FantomLexer']
class FantomLexer(RegexLexer):
"""
For Fantom source code.
.. versionadded:: 1.5
"""
name = 'Fantom'
aliases = ['fan']
filenames = ['*.fan']
mimetypes = ['application/x-fantom']
# often used regexes
def s(str):
return Template(str).substitute(
dict(
pod=r'[\"\w\.]+',
eos=r'\n|;',
id=r'[a-zA-Z_]\w*',
# all chars which can be part of type definition. Starts with
# either letter, or [ (maps), or | (funcs)
type=r'(?:\[|[a-zA-Z_]|\|)[:\w\[\]|\->?]*?',
)
)
tokens = {
'comments': [
(r'(?s)/\*.*?\*/', Comment.Multiline), # Multiline
(r'//.*?$', Comment.Single), # Single line
# TODO: highlight references in fandocs
(r'\*\*.*?$', Comment.Special), # Fandoc
(r'#.*$', Comment.Single) # Shell-style
],
'literals': [
(r'\b-?[\d_]+(ns|ms|sec|min|hr|day)', Number), # Duration
(r'\b-?[\d_]*\.[\d_]+(ns|ms|sec|min|hr|day)', Number), # Duration with dot
(r'\b-?(\d+)?\.\d+(f|F|d|D)?', Number.Float), # Float/Decimal
(r'\b-?0x[0-9a-fA-F_]+', Number.Hex), # Hex
(r'\b-?[\d_]+', Number.Integer), # Int
(r"'\\.'|'[^\\]'|'\\u[0-9a-f]{4}'", String.Char), # Char
(r'"', Punctuation, 'insideStr'), # Opening quote
(r'`', Punctuation, 'insideUri'), # Opening accent
(r'\b(true|false|null)\b', Keyword.Constant), # Bool & null
(r'(?:(\w+)(::))?(\w+)(<\|)(.*?)(\|>)', # DSL
bygroups(Name.Namespace, Punctuation, Name.Class,
Punctuation, String, Punctuation)),
(r'(?:(\w+)(::))?(\w+)?(#)(\w+)?', # Type/slot literal
bygroups(Name.Namespace, Punctuation, Name.Class,
Punctuation, Name.Function)),
(r'\[,\]', Literal), # Empty list
(s(r'($type)(\[,\])'), # Typed empty list
bygroups(using(this, state='inType'), Literal)),
(r'\[:\]', Literal), # Empty Map
(s(r'($type)(\[:\])'),
bygroups(using(this, state='inType'), Literal)),
],
'insideStr': [
(r'\\\\', String.Escape), # Escaped backslash
(r'\\"', String.Escape), # Escaped "
(r'\\`', String.Escape), # Escaped `
(r'\$\w+', String.Interpol), # Subst var
(r'\$\{.*?\}', String.Interpol), # Subst expr
(r'"', Punctuation, '#pop'), # Closing quot
(r'.', String) # String content
],
'insideUri': [ # TODO: remove copy/paste str/uri
(r'\\\\', String.Escape), # Escaped backslash
(r'\\"', String.Escape), # Escaped "
(r'\\`', String.Escape), # Escaped `
(r'\$\w+', String.Interpol), # Subst var
(r'\$\{.*?\}', String.Interpol), # Subst expr
(r'`', Punctuation, '#pop'), # Closing tick
(r'.', String.Backtick) # URI content
],
'protectionKeywords': [
(r'\b(public|protected|private|internal)\b', Keyword),
],
'typeKeywords': [
(r'\b(abstract|final|const|native|facet|enum)\b', Keyword),
],
'methodKeywords': [
(r'\b(abstract|native|once|override|static|virtual|final)\b',
Keyword),
],
'fieldKeywords': [
(r'\b(abstract|const|final|native|override|static|virtual|'
r'readonly)\b', Keyword)
],
'otherKeywords': [
(words((
'try', 'catch', 'throw', 'finally', 'for', 'if', 'else', 'while',
'as', 'is', 'isnot', 'switch', 'case', 'default', 'continue',
'break', 'do', 'return', 'get', 'set'), prefix=r'\b', suffix=r'\b'),
Keyword),
(r'\b(it|this|super)\b', Name.Builtin.Pseudo),
],
'operators': [
(r'\+\+|\-\-|\+|\-|\*|/|\|\||&&|<=>|<=|<|>=|>|=|!|\[|\]', Operator)
],
'inType': [
(r'[\[\]|\->:?]', Punctuation),
(s(r'$id'), Name.Class),
default('#pop'),
],
'root': [
include('comments'),
include('protectionKeywords'),
include('typeKeywords'),
include('methodKeywords'),
include('fieldKeywords'),
include('literals'),
include('otherKeywords'),
include('operators'),
(r'using\b', Keyword.Namespace, 'using'), # Using stmt
(r'@\w+', Name.Decorator, 'facet'), # Symbol
(r'(class|mixin)(\s+)(\w+)', bygroups(Keyword, Whitespace, Name.Class),
'inheritance'), # Inheritance list
# Type var := val
(s(r'($type)([ \t]+)($id)(\s*)(:=)'),
bygroups(using(this, state='inType'), Whitespace,
Name.Variable, Whitespace, Operator)),
# var := val
(s(r'($id)(\s*)(:=)'),
bygroups(Name.Variable, Whitespace, Operator)),
# .someId( or ->someId( ###
(s(r'(\.|(?:\->))($id)(\s*)(\()'),
bygroups(Operator, Name.Function, Whitespace, Punctuation),
'insideParen'),
# .someId or ->someId
(s(r'(\.|(?:\->))($id)'),
bygroups(Operator, Name.Function)),
# new makeXXX (
(r'(new)(\s+)(make\w*)(\s*)(\()',
bygroups(Keyword, Whitespace, Name.Function, Whitespace, Punctuation),
'insideMethodDeclArgs'),
# Type name (
(s(r'($type)([ \t]+)' # Return type and whitespace
r'($id)(\s*)(\()'), # method name + open brace
bygroups(using(this, state='inType'), Whitespace,
Name.Function, Whitespace, Punctuation),
'insideMethodDeclArgs'),
# ArgType argName,
(s(r'($type)(\s+)($id)(\s*)(,)'),
bygroups(using(this, state='inType'), Whitespace, Name.Variable,
Whitespace, Punctuation)),
# ArgType argName)
# Covered in 'insideParen' state
# ArgType argName -> ArgType|
(s(r'($type)(\s+)($id)(\s*)(\->)(\s*)($type)(\|)'),
bygroups(using(this, state='inType'), Whitespace, Name.Variable,
Whitespace, Punctuation, Whitespace, using(this, state='inType'),
Punctuation)),
# ArgType argName|
(s(r'($type)(\s+)($id)(\s*)(\|)'),
bygroups(using(this, state='inType'), Whitespace, Name.Variable,
Whitespace, Punctuation)),
# Type var
(s(r'($type)([ \t]+)($id)'),
bygroups(using(this, state='inType'), Whitespace,
Name.Variable)),
(r'\(', Punctuation, 'insideParen'),
(r'\{', Punctuation, 'insideBrace'),
(r'\s+', Whitespace),
(r'.', Text)
],
'insideParen': [
(r'\)', Punctuation, '#pop'),
include('root'),
],
'insideMethodDeclArgs': [
(r'\)', Punctuation, '#pop'),
(s(r'($type)(\s+)($id)(\s*)(\))'),
bygroups(using(this, state='inType'), Whitespace, Name.Variable,
Whitespace, Punctuation), '#pop'),
include('root'),
],
'insideBrace': [
(r'\}', Punctuation, '#pop'),
include('root'),
],
'inheritance': [
(r'\s+', Whitespace), # Whitespace
(r':|,', Punctuation),
(r'(?:(\w+)(::))?(\w+)',
bygroups(Name.Namespace, Punctuation, Name.Class)),
(r'\{', Punctuation, '#pop')
],
'using': [
(r'[ \t]+', Whitespace), # consume whitespaces
(r'(\[)(\w+)(\])',
bygroups(Punctuation, Comment.Special, Punctuation)), # ffi
(r'(\")?([\w.]+)(\")?',
bygroups(Punctuation, Name.Namespace, Punctuation)), # podname
(r'::', Punctuation, 'usingClass'),
default('#pop')
],
'usingClass': [
(r'[ \t]+', Whitespace), # consume whitespaces
(r'(as)(\s+)(\w+)',
bygroups(Keyword.Declaration, Whitespace, Name.Class), '#pop:2'),
(r'[\w$]+', Name.Class),
default('#pop:2') # jump out to root state
],
'facet': [
(r'\s+', Whitespace),
(r'\{', Punctuation, 'facetFields'),
default('#pop')
],
'facetFields': [
include('comments'),
include('literals'),
include('operators'),
(r'\s+', Whitespace),
(r'(\s*)(\w+)(\s*)(=)', bygroups(Whitespace, Name, Whitespace, Operator)),
(r'\}', Punctuation, '#pop'),
(r'\s+', Whitespace),
(r'.', Text)
],
}
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