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"""
pygments.lexers.r
~~~~~~~~~~~~~~~~~
Lexers for the R/S languages.
:copyright: Copyright 2006-2021 by the Pygments team, see AUTHORS.
:license: BSD, see LICENSE for details.
"""
import re
from pygments.lexer import Lexer, RegexLexer, include, do_insertions
from pygments.token import Text, Comment, Operator, Keyword, Name, String, \
Number, Punctuation, Generic
__all__ = ['RConsoleLexer', 'SLexer', 'RdLexer']
line_re = re.compile('.*?\n')
class RConsoleLexer(Lexer):
"""
For R console transcripts or R CMD BATCH output files.
"""
name = 'RConsole'
aliases = ['rconsole', 'rout']
filenames = ['*.Rout']
def get_tokens_unprocessed(self, text):
slexer = SLexer(**self.options)
current_code_block = ''
insertions = []
for match in line_re.finditer(text):
line = match.group()
if line.startswith('>') or line.startswith('+'):
# Colorize the prompt as such,
# then put rest of line into current_code_block
insertions.append((len(current_code_block),
[(0, Generic.Prompt, line[:2])]))
current_code_block += line[2:]
else:
# We have reached a non-prompt line!
# If we have stored prompt lines, need to process them first.
if current_code_block:
# Weave together the prompts and highlight code.
yield from do_insertions(
insertions, slexer.get_tokens_unprocessed(current_code_block))
# Reset vars for next code block.
current_code_block = ''
insertions = []
# Now process the actual line itself, this is output from R.
yield match.start(), Generic.Output, line
# If we happen to end on a code block with nothing after it, need to
# process the last code block. This is neither elegant nor DRY so
# should be changed.
if current_code_block:
yield from do_insertions(
insertions, slexer.get_tokens_unprocessed(current_code_block))
class SLexer(RegexLexer):
"""
For S, S-plus, and R source code.
.. versionadded:: 0.10
"""
name = 'S'
aliases = ['splus', 's', 'r']
filenames = ['*.S', '*.R', '.Rhistory', '.Rprofile', '.Renviron']
mimetypes = ['text/S-plus', 'text/S', 'text/x-r-source', 'text/x-r',
'text/x-R', 'text/x-r-history', 'text/x-r-profile']
valid_name = r'`[^`\\]*(?:\\.[^`\\]*)*`|(?:[a-zA-Z]|\.[A-Za-z_.])[\w.]*|\.'
tokens = {
'comments': [
(r'#.*$', Comment.Single),
],
'valid_name': [
(valid_name, Name),
],
'punctuation': [
(r'\[{1,2}|\]{1,2}|\(|\)|;|,', Punctuation),
],
'keywords': [
(r'(if|else|for|while|repeat|in|next|break|return|switch|function)'
r'(?![\w.])',
Keyword.Reserved),
],
'operators': [
(r'<<?-|->>?|-|==|<=|>=|<|>|&&?|!=|\|\|?|\?', Operator),
(r'\*|\+|\^|/|!|%[^%]*%|=|~|\$|@|:{1,3}', Operator),
],
'builtin_symbols': [
(r'(NULL|NA(_(integer|real|complex|character)_)?|'
r'letters|LETTERS|Inf|TRUE|FALSE|NaN|pi|\.\.(\.|[0-9]+))'
r'(?![\w.])',
Keyword.Constant),
(r'(T|F)\b', Name.Builtin.Pseudo),
],
'numbers': [
# hex number
(r'0[xX][a-fA-F0-9]+([pP][0-9]+)?[Li]?', Number.Hex),
# decimal number
(r'[+-]?([0-9]+(\.[0-9]+)?|\.[0-9]+|\.)([eE][+-]?[0-9]+)?[Li]?',
Number),
],
'statements': [
include('comments'),
# whitespaces
(r'\s+', Text),
(r'\'', String, 'string_squote'),
(r'\"', String, 'string_dquote'),
include('builtin_symbols'),
include('valid_name'),
include('numbers'),
include('keywords'),
include('punctuation'),
include('operators'),
],
'root': [
# calls:
(r'(%s)\s*(?=\()' % valid_name, Name.Function),
include('statements'),
# blocks:
(r'\{|\}', Punctuation),
# (r'\{', Punctuation, 'block'),
(r'.', Text),
],
# 'block': [
# include('statements'),
# ('\{', Punctuation, '#push'),
# ('\}', Punctuation, '#pop')
# ],
'string_squote': [
(r'([^\'\\]|\\.)*\'', String, '#pop'),
],
'string_dquote': [
(r'([^"\\]|\\.)*"', String, '#pop'),
],
}
def analyse_text(text):
if re.search(r'[a-z0-9_\])\s]<-(?!-)', text):
return 0.11
class RdLexer(RegexLexer):
"""
Pygments Lexer for R documentation (Rd) files
This is a very minimal implementation, highlighting little more
than the macros. A description of Rd syntax is found in `Writing R
Extensions <http://cran.r-project.org/doc/manuals/R-exts.html>`_
and `Parsing Rd files <http://developer.r-project.org/parseRd.pdf>`_.
.. versionadded:: 1.6
"""
name = 'Rd'
aliases = ['rd']
filenames = ['*.Rd']
mimetypes = ['text/x-r-doc']
# To account for verbatim / LaTeX-like / and R-like areas
# would require parsing.
tokens = {
'root': [
# catch escaped brackets and percent sign
(r'\\[\\{}%]', String.Escape),
# comments
(r'%.*$', Comment),
# special macros with no arguments
(r'\\(?:cr|l?dots|R|tab)\b', Keyword.Constant),
# macros
(r'\\[a-zA-Z]+\b', Keyword),
# special preprocessor macros
(r'^\s*#(?:ifn?def|endif).*\b', Comment.Preproc),
# non-escaped brackets
(r'[{}]', Name.Builtin),
# everything else
(r'[^\\%\n{}]+', Text),
(r'.', Text),
]
}
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