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"""
pygments.lexers.monte
~~~~~~~~~~~~~~~~~~~~~
Lexer for the Monte programming language.
:copyright: Copyright 2006-2021 by the Pygments team, see AUTHORS.
:license: BSD, see LICENSE for details.
"""
from pygments.token import Comment, Error, Keyword, Name, Number, Operator, \
Punctuation, String, Whitespace
from pygments.lexer import RegexLexer, include, words
__all__ = ['MonteLexer']
# `var` handled separately
# `interface` handled separately
_declarations = ['bind', 'def', 'fn', 'object']
_methods = ['method', 'to']
_keywords = [
'as', 'break', 'catch', 'continue', 'else', 'escape', 'exit', 'exports',
'extends', 'finally', 'for', 'guards', 'if', 'implements', 'import',
'in', 'match', 'meta', 'pass', 'return', 'switch', 'try', 'via', 'when',
'while',
]
_operators = [
# Unary
'~', '!',
# Binary
'+', '-', '*', '/', '%', '**', '&', '|', '^', '<<', '>>',
# Binary augmented
'+=', '-=', '*=', '/=', '%=', '**=', '&=', '|=', '^=', '<<=', '>>=',
# Comparison
'==', '!=', '<', '<=', '>', '>=', '<=>',
# Patterns and assignment
':=', '?', '=~', '!~', '=>',
# Calls and sends
'.', '<-', '->',
]
_escape_pattern = (
r'(?:\\x[0-9a-fA-F]{2}|\\u[0-9a-fA-F]{4}|\\U[0-9a-fA-F]{8}|'
r'\\["\'\\bftnr])')
# _char = _escape_chars + [('.', String.Char)]
_identifier = r'[_a-zA-Z]\w*'
_constants = [
# Void constants
'null',
# Bool constants
'false', 'true',
# Double constants
'Infinity', 'NaN',
# Special objects
'M', 'Ref', 'throw', 'traceln',
]
_guards = [
'Any', 'Binding', 'Bool', 'Bytes', 'Char', 'DeepFrozen', 'Double',
'Empty', 'Int', 'List', 'Map', 'Near', 'NullOk', 'Same', 'Selfless',
'Set', 'Str', 'SubrangeGuard', 'Transparent', 'Void',
]
_safeScope = [
'_accumulateList', '_accumulateMap', '_auditedBy', '_bind',
'_booleanFlow', '_comparer', '_equalizer', '_iterForever', '_loop',
'_makeBytes', '_makeDouble', '_makeFinalSlot', '_makeInt', '_makeList',
'_makeMap', '_makeMessageDesc', '_makeOrderedSpace', '_makeParamDesc',
'_makeProtocolDesc', '_makeSourceSpan', '_makeString', '_makeVarSlot',
'_makeVerbFacet', '_mapExtract', '_matchSame', '_quasiMatcher',
'_slotToBinding', '_splitList', '_suchThat', '_switchFailed',
'_validateFor', 'b__quasiParser', 'eval', 'import', 'm__quasiParser',
'makeBrandPair', 'makeLazySlot', 'safeScope', 'simple__quasiParser',
]
class MonteLexer(RegexLexer):
"""
Lexer for the `Monte <https://monte.readthedocs.io/>`_ programming language.
.. versionadded:: 2.2
"""
name = 'Monte'
aliases = ['monte']
filenames = ['*.mt']
tokens = {
'root': [
# Comments
(r'#[^\n]*\n', Comment),
# Docstrings
# Apologies for the non-greedy matcher here.
(r'/\*\*.*?\*/', String.Doc),
# `var` declarations
(r'\bvar\b', Keyword.Declaration, 'var'),
# `interface` declarations
(r'\binterface\b', Keyword.Declaration, 'interface'),
# method declarations
(words(_methods, prefix='\\b', suffix='\\b'),
Keyword, 'method'),
# All other declarations
(words(_declarations, prefix='\\b', suffix='\\b'),
Keyword.Declaration),
# Keywords
(words(_keywords, prefix='\\b', suffix='\\b'), Keyword),
# Literals
('[+-]?0x[_0-9a-fA-F]+', Number.Hex),
(r'[+-]?[_0-9]+\.[_0-9]*([eE][+-]?[_0-9]+)?', Number.Float),
('[+-]?[_0-9]+', Number.Integer),
("'", String.Double, 'char'),
('"', String.Double, 'string'),
# Quasiliterals
('`', String.Backtick, 'ql'),
# Operators
(words(_operators), Operator),
# Verb operators
(_identifier + '=', Operator.Word),
# Safe scope constants
(words(_constants, prefix='\\b', suffix='\\b'),
Keyword.Pseudo),
# Safe scope guards
(words(_guards, prefix='\\b', suffix='\\b'), Keyword.Type),
# All other safe scope names
(words(_safeScope, prefix='\\b', suffix='\\b'),
Name.Builtin),
# Identifiers
(_identifier, Name),
# Punctuation
(r'\(|\)|\{|\}|\[|\]|:|,', Punctuation),
# Whitespace
(' +', Whitespace),
# Definite lexer errors
('=', Error),
],
'char': [
# It is definitely an error to have a char of width == 0.
("'", Error, 'root'),
(_escape_pattern, String.Escape, 'charEnd'),
('.', String.Char, 'charEnd'),
],
'charEnd': [
("'", String.Char, '#pop:2'),
# It is definitely an error to have a char of width > 1.
('.', Error),
],
# The state of things coming into an interface.
'interface': [
(' +', Whitespace),
(_identifier, Name.Class, '#pop'),
include('root'),
],
# The state of things coming into a method.
'method': [
(' +', Whitespace),
(_identifier, Name.Function, '#pop'),
include('root'),
],
'string': [
('"', String.Double, 'root'),
(_escape_pattern, String.Escape),
(r'\n', String.Double),
('.', String.Double),
],
'ql': [
('`', String.Backtick, 'root'),
(r'\$' + _escape_pattern, String.Escape),
(r'\$\$', String.Escape),
(r'@@', String.Escape),
(r'\$\{', String.Interpol, 'qlNest'),
(r'@\{', String.Interpol, 'qlNest'),
(r'\$' + _identifier, Name),
('@' + _identifier, Name),
('.', String.Backtick),
],
'qlNest': [
(r'\}', String.Interpol, '#pop'),
include('root'),
],
# The state of things immediately following `var`.
'var': [
(' +', Whitespace),
(_identifier, Name.Variable, '#pop'),
include('root'),
],
}
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