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"""
pygments.lexers.stata
~~~~~~~~~~~~~~~~~~~~~
Lexer for Stata
:copyright: Copyright 2006-2021 by the Pygments team, see AUTHORS.
:license: BSD, see LICENSE for details.
"""
import re
from pygments.lexer import RegexLexer, default, include, words
from pygments.token import Comment, Keyword, Name, Number, \
String, Text, Operator
from pygments.lexers._stata_builtins import builtins_base, builtins_functions
__all__ = ['StataLexer']
class StataLexer(RegexLexer):
"""
For `Stata <http://www.stata.com/>`_ do files.
.. versionadded:: 2.2
"""
# Syntax based on
# - http://fmwww.bc.edu/RePEc/bocode/s/synlightlist.ado
# - https://github.com/isagalaev/highlight.js/blob/master/src/languages/stata.js
# - https://github.com/jpitblado/vim-stata/blob/master/syntax/stata.vim
name = 'Stata'
aliases = ['stata', 'do']
filenames = ['*.do', '*.ado']
mimetypes = ['text/x-stata', 'text/stata', 'application/x-stata']
flags = re.MULTILINE | re.DOTALL
tokens = {
'root': [
include('comments'),
include('strings'),
include('macros'),
include('numbers'),
include('keywords'),
include('operators'),
include('format'),
(r'.', Text),
],
# Comments are a complicated beast in Stata because they can be
# nested and there are a few corner cases with that. See:
# - github.com/kylebarron/language-stata/issues/90
# - statalist.org/forums/forum/general-stata-discussion/general/1448244
'comments': [
(r'(^//|(?<=\s)//)(?!/)', Comment.Single, 'comments-double-slash'),
(r'^\s*\*', Comment.Single, 'comments-star'),
(r'/\*', Comment.Multiline, 'comments-block'),
(r'(^///|(?<=\s)///)', Comment.Special, 'comments-triple-slash')
],
'comments-block': [
(r'/\*', Comment.Multiline, '#push'),
# this ends and restarts a comment block. but need to catch this so
# that it doesn\'t start _another_ level of comment blocks
(r'\*/\*', Comment.Multiline),
(r'(\*/\s+\*(?!/)[^\n]*)|(\*/)', Comment.Multiline, '#pop'),
# Match anything else as a character inside the comment
(r'.', Comment.Multiline),
],
'comments-star': [
(r'///.*?\n', Comment.Single,
('#pop', 'comments-triple-slash')),
(r'(^//|(?<=\s)//)(?!/)', Comment.Single,
('#pop', 'comments-double-slash')),
(r'/\*', Comment.Multiline, 'comments-block'),
(r'.(?=\n)', Comment.Single, '#pop'),
(r'.', Comment.Single),
],
'comments-triple-slash': [
(r'\n', Comment.Special, '#pop'),
# A // breaks out of a comment for the rest of the line
(r'//.*?(?=\n)', Comment.Single, '#pop'),
(r'.', Comment.Special),
],
'comments-double-slash': [
(r'\n', Text, '#pop'),
(r'.', Comment.Single),
],
# `"compound string"' and regular "string"; note the former are
# nested.
'strings': [
(r'`"', String, 'string-compound'),
(r'(?<!`)"', String, 'string-regular'),
],
'string-compound': [
(r'`"', String, '#push'),
(r'"\'', String, '#pop'),
(r'\\\\|\\"|\\\$|\\`|\\\n', String.Escape),
include('macros'),
(r'.', String)
],
'string-regular': [
(r'(")(?!\')|(?=\n)', String, '#pop'),
(r'\\\\|\\"|\\\$|\\`|\\\n', String.Escape),
include('macros'),
(r'.', String)
],
# A local is usually
# `\w{0,31}'
# `:extended macro'
# `=expression'
# `[rsen](results)'
# `(++--)scalar(++--)'
#
# However, there are all sorts of weird rules wrt edge
# cases. Instead of writing 27 exceptions, anything inside
# `' is a local.
#
# A global is more restricted, so we do follow rules. Note only
# locals explicitly enclosed ${} can be nested.
'macros': [
(r'\$(\{|(?=[$`]))', Name.Variable.Global, 'macro-global-nested'),
(r'\$', Name.Variable.Global, 'macro-global-name'),
(r'`', Name.Variable, 'macro-local'),
],
'macro-local': [
(r'`', Name.Variable, '#push'),
(r"'", Name.Variable, '#pop'),
(r'\$(\{|(?=[$`]))', Name.Variable.Global, 'macro-global-nested'),
(r'\$', Name.Variable.Global, 'macro-global-name'),
(r'.', Name.Variable), # fallback
],
'macro-global-nested': [
(r'\$(\{|(?=[$`]))', Name.Variable.Global, '#push'),
(r'\}', Name.Variable.Global, '#pop'),
(r'\$', Name.Variable.Global, 'macro-global-name'),
(r'`', Name.Variable, 'macro-local'),
(r'\w', Name.Variable.Global), # fallback
default('#pop'),
],
'macro-global-name': [
(r'\$(\{|(?=[$`]))', Name.Variable.Global, 'macro-global-nested', '#pop'),
(r'\$', Name.Variable.Global, 'macro-global-name', '#pop'),
(r'`', Name.Variable, 'macro-local', '#pop'),
(r'\w{1,32}', Name.Variable.Global, '#pop'),
],
# Built in functions and statements
'keywords': [
(words(builtins_functions, prefix = r'\b', suffix = r'(?=\()'),
Name.Function),
(words(builtins_base, prefix = r'(^\s*|\s)', suffix = r'\b'),
Keyword),
],
# http://www.stata.com/help.cgi?operators
'operators': [
(r'-|==|<=|>=|<|>|&|!=', Operator),
(r'\*|\+|\^|/|!|~|==|~=', Operator)
],
# Stata numbers
'numbers': [
# decimal number
(r'\b[+-]?([0-9]+(\.[0-9]+)?|\.[0-9]+|\.)([eE][+-]?[0-9]+)?[i]?\b',
Number),
],
# Stata formats
'format': [
(r'%-?\d{1,2}(\.\d{1,2})?[gfe]c?', Name.Other),
(r'%(21x|16H|16L|8H|8L)', Name.Other),
(r'%-?(tc|tC|td|tw|tm|tq|th|ty|tg)\S{0,32}', Name.Other),
(r'%[-~]?\d{1,4}s', Name.Other),
]
}
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