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# -*- coding: utf-8 -*-
Lexers for functional languages.
:copyright: Copyright 2006-2011 by the Pygments team, see AUTHORS.
:license: BSD, see LICENSE for details.
import re
from pygments.lexer import Lexer, RegexLexer, bygroups, include, do_insertions
from pygments.token import Text, Comment, Operator, Keyword, Name, \
String, Number, Punctuation, Literal, Generic, Error
__all__ = ['SchemeLexer', 'CommonLispLexer', 'HaskellLexer',
'LiterateHaskellLexer', 'SMLLexer', 'OcamlLexer', 'ErlangLexer',
'ErlangShellLexer', 'NewLispLexer']
class SchemeLexer(RegexLexer):
A Scheme lexer, parsing a stream and outputting the tokens
needed to highlight scheme code.
This lexer could be most probably easily subclassed to parse
other LISP-Dialects like Common Lisp, Emacs Lisp or AutoLisp.
This parser is checked with pastes from the LISP pastebin
at to cover as much syntax as possible.
It supports the full Scheme syntax as defined in R5RS.
*New in Pygments 0.6.*
name = 'Scheme'
aliases = ['scheme', 'scm']
filenames = ['*.scm', '*.ss', '*.rkt']
mimetypes = ['text/x-scheme', 'application/x-scheme']
# list of known keywords and builtins taken form vim 6.4 scheme.vim
# syntax file.
keywords = [
'lambda', 'define', 'if', 'else', 'cond', 'and', 'or', 'case', 'let',
'let*', 'letrec', 'begin', 'do', 'delay', 'set!', '=>', 'quote',
'quasiquote', 'unquote', 'unquote-splicing', 'define-syntax',
'let-syntax', 'letrec-syntax', 'syntax-rules'
builtins = [
'*', '+', '-', '/', '<', '<=', '=', '>', '>=', 'abs', 'acos', 'angle',
'append', 'apply', 'asin', 'assoc', 'assq', 'assv', 'atan',
'boolean?', 'caaaar', 'caaadr', 'caaar', 'caadar', 'caaddr', 'caadr',
'caar', 'cadaar', 'cadadr', 'cadar', 'caddar', 'cadddr', 'caddr',
'cadr', 'call-with-current-continuation', 'call-with-input-file',
'call-with-output-file', 'call-with-values', 'call/cc', 'car',
'cdaaar', 'cdaadr', 'cdaar', 'cdadar', 'cdaddr', 'cdadr', 'cdar',
'cddaar', 'cddadr', 'cddar', 'cdddar', 'cddddr', 'cdddr', 'cddr',
'cdr', 'ceiling', 'char->integer', 'char-alphabetic?', 'char-ci<=?',
'char-ci<?', 'char-ci=?', 'char-ci>=?', 'char-ci>?', 'char-downcase',
'char-lower-case?', 'char-numeric?', 'char-ready?', 'char-upcase',
'char-upper-case?', 'char-whitespace?', 'char<=?', 'char<?', 'char=?',
'char>=?', 'char>?', 'char?', 'close-input-port', 'close-output-port',
'complex?', 'cons', 'cos', 'current-input-port', 'current-output-port',
'denominator', 'display', 'dynamic-wind', 'eof-object?', 'eq?',
'equal?', 'eqv?', 'eval', 'even?', 'exact->inexact', 'exact?', 'exp',
'expt', 'floor', 'for-each', 'force', 'gcd', 'imag-part',
'inexact->exact', 'inexact?', 'input-port?', 'integer->char',
'integer?', 'interaction-environment', 'lcm', 'length', 'list',
'list->string', 'list->vector', 'list-ref', 'list-tail', 'list?',
'load', 'log', 'magnitude', 'make-polar', 'make-rectangular',
'make-string', 'make-vector', 'map', 'max', 'member', 'memq', 'memv',
'min', 'modulo', 'negative?', 'newline', 'not', 'null-environment',
'null?', 'number->string', 'number?', 'numerator', 'odd?',
'open-input-file', 'open-output-file', 'output-port?', 'pair?',
'peek-char', 'port?', 'positive?', 'procedure?', 'quotient',
'rational?', 'rationalize', 'read', 'read-char', 'real-part', 'real?',
'remainder', 'reverse', 'round', 'scheme-report-environment',
'set-car!', 'set-cdr!', 'sin', 'sqrt', 'string', 'string->list',
'string->number', 'string->symbol', 'string-append', 'string-ci<=?',
'string-ci<?', 'string-ci=?', 'string-ci>=?', 'string-ci>?',
'string-copy', 'string-fill!', 'string-length', 'string-ref',
'string-set!', 'string<=?', 'string<?', 'string=?', 'string>=?',
'string>?', 'string?', 'substring', 'symbol->string', 'symbol?',
'tan', 'transcript-off', 'transcript-on', 'truncate', 'values',
'vector', 'vector->list', 'vector-fill!', 'vector-length',
'vector-ref', 'vector-set!', 'vector?', 'with-input-from-file',
'with-output-to-file', 'write', 'write-char', 'zero?'
# valid names for identifiers
# well, names can only not consist fully of numbers
# but this should be good enough for now
valid_name = r'[a-zA-Z0-9!$%&*+,/:<=>?@^_~|-]+'
tokens = {
'root' : [
# the comments - always starting with semicolon
# and going to the end of the line
(r';.*$', Comment.Single),
# whitespaces - usually not relevant
(r'\s+', Text),
# numbers
(r'-?\d+\.\d+', Number.Float),
(r'-?\d+', Number.Integer),
# support for uncommon kinds of numbers -
# have to figure out what the characters mean
#(r'(#e|#i|#b|#o|#d|#x)[\d.]+', Number),
# strings, symbols and characters
(r'"(\\\\|\\"|[^"])*"', String),
(r"'" + valid_name, String.Symbol),
(r"#\\([()/'\".'_!§$%& ?=+-]{1}|[a-zA-Z0-9]+)", String.Char),
# constants
(r'(#t|#f)', Name.Constant),
# special operators
(r"('|#|`|,@|,|\.)", Operator),
# highlight the keywords
('(%s)' % '|'.join([
re.escape(entry) + ' ' for entry in keywords]),
# first variable in a quoted string like
# '(this is syntactic sugar)
(r"(?<='\()" + valid_name, Name.Variable),
(r"(?<=#\()" + valid_name, Name.Variable),
# highlight the builtins
("(?<=\()(%s)" % '|'.join([
re.escape(entry) + ' ' for entry in builtins]),
# the remaining functions
(r'(?<=\()' + valid_name, Name.Function),
# find the remaining variables
(valid_name, Name.Variable),
# the famous parentheses!
(r'(\(|\))', Punctuation),
class CommonLispLexer(RegexLexer):
A Common Lisp lexer.
*New in Pygments 0.9.*
name = 'Common Lisp'
aliases = ['common-lisp', 'cl']
filenames = ['*.cl', '*.lisp', '*.el'] # use for Elisp too
mimetypes = ['text/x-common-lisp']
### couple of useful regexes
# characters that are not macro-characters and can be used to begin a symbol
nonmacro = r'\\.|[a-zA-Z0-9!$%&*+-/<=>?@\[\]^_{}~]'
constituent = nonmacro + '|[#.:]'
terminated = r'(?=[ "()\'\n,;`])' # whitespace or terminating macro characters
### symbol token, reverse-engineered from hyperspec
# Take a deep breath...
symbol = r'(\|[^|]+\||(?:%s)(?:%s)*)' % (nonmacro, constituent)
def __init__(self, **options):
from pygments.lexers._clbuiltins import BUILTIN_FUNCTIONS, \
self.builtin_function = BUILTIN_FUNCTIONS
self.special_forms = SPECIAL_FORMS
self.macros = MACROS
self.lambda_list_keywords = LAMBDA_LIST_KEYWORDS
self.declarations = DECLARATIONS
self.builtin_types = BUILTIN_TYPES
self.builtin_classes = BUILTIN_CLASSES
RegexLexer.__init__(self, **options)
def get_tokens_unprocessed(self, text):
stack = ['root']
for index, token, value in RegexLexer.get_tokens_unprocessed(self, text, stack):
if token is Name.Variable:
if value in self.builtin_function:
yield index, Name.Builtin, value
if value in self.special_forms:
yield index, Keyword, value
if value in self.macros:
yield index, Name.Builtin, value
if value in self.lambda_list_keywords:
yield index, Keyword, value
if value in self.declarations:
yield index, Keyword, value
if value in self.builtin_types:
yield index, Keyword.Type, value
if value in self.builtin_classes:
yield index, Name.Class, value
yield index, token, value
tokens = {
'root' : [
('', Text, 'body'),
'multiline-comment' : [
(r'#\|', Comment.Multiline, '#push'), # (cf. Hyperspec
(r'\|#', Comment.Multiline, '#pop'),
(r'[^|#]+', Comment.Multiline),
(r'[|#]', Comment.Multiline),
'commented-form' : [
(r'\(', Comment.Preproc, '#push'),
(r'\)', Comment.Preproc, '#pop'),
(r'[^()]+', Comment.Preproc),
'body' : [
# whitespace
(r'\s+', Text),
# single-line comment
(r';.*$', Comment.Single),
# multi-line comment
(r'#\|', Comment.Multiline, 'multiline-comment'),
# encoding comment (?)
(r'#\d*Y.*$', Comment.Special),
# strings and characters
(r'"(\\.|[^"\\])*"', String),
# quoting
(r":" + symbol, String.Symbol),
(r"'" + symbol, String.Symbol),
(r"'", Operator),
(r"`", Operator),
# decimal numbers
(r'[-+]?\d+\.?' + terminated, Number.Integer),
(r'[-+]?\d+/\d+' + terminated, Number),
(r'[-+]?(\d*\.\d+([defls][-+]?\d+)?|\d+(\.\d*)?[defls][-+]?\d+)' \
+ terminated, Number.Float),
# sharpsign strings and characters
(r"#\\." + terminated, String.Char),
(r"#\\" + symbol, String.Char),
# vector
(r'#\(', Operator, 'body'),
# bitstring
(r'#\d*\*[01]*', Literal.Other),
# uninterned symbol
(r'#:' + symbol, String.Symbol),
# read-time and load-time evaluation
(r'#[.,]', Operator),
# function shorthand
(r'#\'', Name.Function),
# binary rational
(r'#[bB][+-]?[01]+(/[01]+)?', Number),
# octal rational
(r'#[oO][+-]?[0-7]+(/[0-7]+)?', Number.Oct),
# hex rational
(r'#[xX][+-]?[0-9a-fA-F]+(/[0-9a-fA-F]+)?', Number.Hex),
# radix rational
(r'#\d+[rR][+-]?[0-9a-zA-Z]+(/[0-9a-zA-Z]+)?', Number),
# complex
(r'(#[cC])(\()', bygroups(Number, Punctuation), 'body'),
# array
(r'(#\d+[aA])(\()', bygroups(Literal.Other, Punctuation), 'body'),
# structure
(r'(#[sS])(\()', bygroups(Literal.Other, Punctuation), 'body'),
# path
(r'#[pP]?"(\\.|[^"])*"', Literal.Other),
# reference
(r'#\d+=', Operator),
(r'#\d+#', Operator),
# read-time comment
(r'#+nil' + terminated + '\s*\(', Comment.Preproc, 'commented-form'),
# read-time conditional
(r'#[+-]', Operator),
# special operators that should have been parsed already
(r'(,@|,|\.)', Operator),
# special constants
(r'(t|nil)' + terminated, Name.Constant),
# functions and variables
(r'\*' + symbol + '\*', Name.Variable.Global),
(symbol, Name.Variable),
# parentheses
(r'\(', Punctuation, 'body'),
(r'\)', Punctuation, '#pop'),
class HaskellLexer(RegexLexer):
A Haskell lexer based on the lexemes defined in the Haskell 98 Report.
*New in Pygments 0.8.*
name = 'Haskell'
aliases = ['haskell', 'hs']
filenames = ['*.hs']
mimetypes = ['text/x-haskell']
reserved = ['case','class','data','default','deriving','do','else',
ascii = ['NUL','SOH','[SE]TX','EOT','ENQ','ACK',
tokens = {
'root': [
# Whitespace:
(r'\s+', Text),
#(r'--\s*|.*$', Comment.Doc),
(r'--(?![!#$%&*+./<=>?@\^|_~]).*?$', Comment.Single),
(r'{-', Comment.Multiline, 'comment'),
# Lexemes:
# Identifiers
(r'\bimport\b', Keyword.Reserved, 'import'),
(r'\bmodule\b', Keyword.Reserved, 'module'),
(r'\berror\b', Name.Exception),
(r'\b(%s)(?!\')\b' % '|'.join(reserved), Keyword.Reserved),
(r'^[_a-z][\w\']*', Name.Function),
(r'[_a-z][\w\']*', Name),
(r'[A-Z][\w\']*', Keyword.Type),
# Operators
(r'\\(?![:!#$%&*+.\\/<=>?@^|~-]+)', Name.Function), # lambda operator
(r'(<-|::|->|=>|=)(?![:!#$%&*+.\\/<=>?@^|~-]+)', Operator.Word), # specials
(r':[:!#$%&*+.\\/<=>?@^|~-]*', Keyword.Type), # Constructor operators
(r'[:!#$%&*+.\\/<=>?@^|~-]+', Operator), # Other operators
# Numbers
(r'\d+[eE][+-]?\d+', Number.Float),
(r'\d+\.\d+([eE][+-]?\d+)?', Number.Float),
(r'0[oO][0-7]+', Number.Oct),
(r'0[xX][\da-fA-F]+', Number.Hex),
(r'\d+', Number.Integer),
# Character/String Literals
(r"'", String.Char, 'character'),
(r'"', String, 'string'),
# Special
(r'\[\]', Keyword.Type),
(r'\(\)', Name.Builtin),
(r'[][(),;`{}]', Punctuation),
'import': [
# Import statements
(r'\s+', Text),
(r'"', String, 'string'),
# after "funclist" state
(r'\)', Punctuation, '#pop'),
(r'qualified\b', Keyword),
# import X as Y
bygroups(Name.Namespace, Text, Keyword, Text, Name), '#pop'),
# import X hiding (functions)
bygroups(Name.Namespace, Text, Keyword, Text, Punctuation), 'funclist'),
# import X (functions)
bygroups(Name.Namespace, Text, Punctuation), 'funclist'),
# import X
(r'[a-zA-Z0-9_.]+', Name.Namespace, '#pop'),
'module': [
(r'\s+', Text),
bygroups(Name.Namespace, Text, Punctuation), 'funclist'),
(r'[A-Z][a-zA-Z0-9_.]*', Name.Namespace, '#pop'),
'funclist': [
(r'\s+', Text),
(r'[A-Z][a-zA-Z0-9_]*', Keyword.Type),
(r'(_[\w\']+|[a-z][\w\']*)', Name.Function),
(r'--.*$', Comment.Single),
(r'{-', Comment.Multiline, 'comment'),
(r',', Punctuation),
(r'[:!#$%&*+.\\/<=>?@^|~-]+', Operator),
# (HACK, but it makes sense to push two instances, believe me)
(r'\(', Punctuation, ('funclist', 'funclist')),
(r'\)', Punctuation, '#pop:2'),
'comment': [
# Multiline Comments
(r'[^-{}]+', Comment.Multiline),
(r'{-', Comment.Multiline, '#push'),
(r'-}', Comment.Multiline, '#pop'),
(r'[-{}]', Comment.Multiline),
'character': [
# Allows multi-chars, incorrectly.
(r"[^\\']", String.Char),
(r"\\", String.Escape, 'escape'),
("'", String.Char, '#pop'),
'string': [
(r'[^\\"]+', String),
(r"\\", String.Escape, 'escape'),
('"', String, '#pop'),
'escape': [
(r'[abfnrtv"\'&\\]', String.Escape, '#pop'),
(r'\^[][A-Z@\^_]', String.Escape, '#pop'),
('|'.join(ascii), String.Escape, '#pop'),
(r'o[0-7]+', String.Escape, '#pop'),
(r'x[\da-fA-F]+', String.Escape, '#pop'),
(r'\d+', String.Escape, '#pop'),
(r'\s+\\', String.Escape, '#pop'),
line_re = re.compile('.*?\n')
bird_re = re.compile(r'(>[ \t]*)(.*\n)')
class LiterateHaskellLexer(Lexer):
For Literate Haskell (Bird-style or LaTeX) source.
Additional options accepted:
If given, must be ``"bird"`` or ``"latex"``. If not given, the style
is autodetected: if the first non-whitespace character in the source
is a backslash or percent character, LaTeX is assumed, else Bird.
*New in Pygments 0.9.*
name = 'Literate Haskell'
aliases = ['lhs', 'literate-haskell']
filenames = ['*.lhs']
mimetypes = ['text/x-literate-haskell']
def get_tokens_unprocessed(self, text):
hslexer = HaskellLexer(**self.options)
style = self.options.get('litstyle')
if style is None:
style = (text.lstrip()[0:1] in '%\\') and 'latex' or 'bird'
code = ''
insertions = []
if style == 'bird':
# bird-style
for match in line_re.finditer(text):
line =
m = bird_re.match(line)
if m:
[(0, Comment.Special,]))
code +=
insertions.append((len(code), [(0, Text, line)]))
# latex-style
from pygments.lexers.text import TexLexer
lxlexer = TexLexer(**self.options)
codelines = 0
latex = ''
for match in line_re.finditer(text):
line =
if codelines:
if line.lstrip().startswith('\\end{code}'):
codelines = 0
latex += line
code += line
elif line.lstrip().startswith('\\begin{code}'):
codelines = 1
latex += line
latex = ''
latex += line
for item in do_insertions(insertions, hslexer.get_tokens_unprocessed(code)):
yield item
class SMLLexer(RegexLexer):
For the Standard ML language.
*New in Pygments 1.5.*
name = 'Standard ML'
aliases = ['sml']
filenames = ['*.sml', '*.sig', '*.fun',]
mimetypes = ['text/x-standardml', 'application/x-standardml']
alphanumid_reserved = [
# Core
'abstype', 'and', 'andalso', 'as', 'case', 'datatype', 'do', 'else',
'end', 'exception', 'fn', 'fun', 'handle', 'if', 'in', 'infix',
'infixr', 'let', 'local', 'nonfix', 'of', 'op', 'open', 'orelse',
'raise', 'rec', 'then', 'type', 'val', 'with', 'withtype', 'while',
# Modules
'eqtype', 'functor', 'include', 'sharing', 'sig', 'signature',
'struct', 'structure', 'where',
symbolicid_reserved = [
# Core
':', '\|', '=', '=>', '->', '#',
# Modules
nonid_reserved = [ '(', ')', '[', ']', '{', '}', ',', ';', '...', '_' ]
alphanumid_re = r"[a-zA-Z][a-zA-Z0-9_']*"
symbolicid_re = r"[!%&$#+\-/:<=>?@\\~`^|*]+"
# A character constant is a sequence of the form #s, where s is a string
# constant denoting a string of size one character. This setup just parses
# the entire string as either a String.Double or a String.Char (depending
# on the argument), even if the String.Char is an erronous
# multiple-character string.
def stringy (whatkind):
return [
(r'[^"\\]', whatkind),
(r'\\[\\\"abtnvfr]', String.Escape),
(r'\\\^[@-^]', String.Escape),
(r'\\[0-9]{3}', String.Escape),
(r'\\u[0-9a-fA-F]{4}', String.Escape),
(r'\\\s+\\', String.Interpol),
(r'"', whatkind, '#pop'),
# Callbacks for distinguishing tokens and reserved words
def long_id_callback(self, match):
if in self.alphanumid_reserved: token = Error
else: token = Name.Namespace
yield match.start(1), token,
yield match.start(2), Punctuation,
def end_id_callback(self, match):
if in self.alphanumid_reserved: token = Error
elif in self.symbolicid_reserved: token = Error
else: token = Name
yield match.start(1), token,
def id_callback(self, match):
str =
if str in self.alphanumid_reserved: token = Keyword.Reserved
elif str in self.symbolicid_reserved: token = Punctuation
else: token = Name
yield match.start(1), token, str
tokens = {
# Whitespace and comments are (almost) everywhere
'whitespace': [
(r'\s+', Text),
(r'\(\*', Comment.Multiline, 'comment'),
'delimiters': [
# This lexer treats these delimiters specially:
# Delimiters define scopes, and the scope is how the meaning of
# the `|' is resolved - is it a case/handle expression, or function
# definition by cases? (This is not how the Definition works, but
# it's how MLton behaves, see
(r'\(|\[|{', Punctuation, 'main'),
(r'\)|\]|}', Punctuation, '#pop'),
(r'\b(let|if|local)\b(?!\')', Keyword.Reserved, ('main', 'main')),
(r'\b(struct|sig|while)\b(?!\')', Keyword.Reserved, 'main'),
(r'\b(do|else|end|in|then)\b(?!\')', Keyword.Reserved, '#pop'),
'core': [
# Punctuation that doesn't overlap symbolic identifiers
(r'(%s)' % '|'.join([re.escape(z) for z in nonid_reserved]),
# Special constants: strings, floats, numbers in decimal and hex
(r'#"', String.Char, 'char'),
(r'"', String.Double, 'string'),
(r'~?0x[0-9a-fA-F]+', Number.Hex),
(r'0wx[0-9a-fA-F]+', Number.Hex),
(r'0w\d+', Number.Integer),
(r'~?\d+\.\d+[eE]~?\d+', Number.Float),
(r'~?\d+\.\d+', Number.Float),
(r'~?\d+[eE]~?\d+', Number.Float),
(r'~?\d+', Number.Integer),
# Labels
(r'#\s*[1-9][0-9]*', Name.Label),
(r'#\s*(%s)' % alphanumid_re, Name.Label),
(r'#\s+(%s)' % symbolicid_re, Name.Label),
# Some reserved words trigger a special, local lexer state change
(r'\b(datatype|abstype)\b(?!\')', Keyword.Reserved, 'dname'),
(r'(?=\b(exception)\b(?!\'))', Text, ('ename')),
Keyword.Reserved, 'sname'),
(r'\b(type|eqtype)\b(?!\')', Keyword.Reserved, 'tname'),
# Regular identifiers, long and otherwise
(r'\'[0-9a-zA-Z_\']*', Name.Decorator),
(r'(%s)(\.)' % alphanumid_re, long_id_callback, "dotted"),
(r'(%s)' % alphanumid_re, id_callback),
(r'(%s)' % symbolicid_re, id_callback),
'dotted': [
(r'(%s)(\.)' % alphanumid_re, long_id_callback),
(r'(%s)' % alphanumid_re, end_id_callback, "#pop"),
(r'(%s)' % symbolicid_re, end_id_callback, "#pop"),
(r'\s+', Error),
(r'\S+', Error),
# Main parser (prevents errors in files that have scoping errors)
'root': [ (r'', Text, 'main') ],
# In this scope, I expect '|' to not be followed by a function name,
# and I expect 'and' to be followed by a binding site
'main': [
# Special behavior of val/and/fun
(r'\b(val|and)\b(?!\')', Keyword.Reserved, 'vname'),
(r'\b(fun)\b(?!\')', Keyword.Reserved,
('#pop', 'main-fun', 'fname')),
(r'\S+', Error),
# In this scope, I expect '|' and 'and' to be followed by a function
'main-fun': [
(r'\s', Text),
(r'\(\*', Comment.Multiline, 'comment'),
# Special behavior of val/and/fun
(r'\b(fun|and)\b(?!\')', Keyword.Reserved, 'fname'),
(r'\b(val)\b(?!\')', Keyword.Reserved,
('#pop', 'main', 'vname')),
# Special behavior of '|' and '|'-manipulating keywords
(r'\|', Punctuation, 'fname'),
(r'\b(case|handle)\b(?!\')', Keyword.Reserved,
('#pop', 'main')),
(r'\S+', Error),
# Character and string parsers
'char': stringy(String.Char),
'string': stringy(String.Double),
'breakout': [
(r'(?=\b(%s)\b(?!\'))' % '|'.join(alphanumid_reserved), Text, '#pop'),
# Dealing with what comes after module system keywords
'sname': [
(r'(%s)' % alphanumid_re, Name.Namespace),
(r'', Text, '#pop'),
# Dealing with what comes after the 'fun' (or 'and' or '|') keyword
'fname': [
(r'\'[0-9a-zA-Z_\']*', Name.Decorator),
(r'\(', Punctuation, 'tyvarseq'),
(r'(%s)' % alphanumid_re, Name.Function, '#pop'),
(r'(%s)' % symbolicid_re, Name.Function, '#pop'),
# Ignore interesting function declarations like "fun (x + y) = ..."
(r'', Text, '#pop'),
# Dealing with what comes after the 'val' (or 'and') keyword
'vname': [
(r'\'[0-9a-zA-Z_\']*', Name.Decorator),
(r'\(', Punctuation, 'tyvarseq'),
(r'(%s)(\s*)(=(?!%s))' % (alphanumid_re, symbolicid_re),
bygroups(Name.Variable, Text, Punctuation), '#pop'),
(r'(%s)(\s*)(=(?!%s))' % (symbolicid_re, symbolicid_re),
bygroups(Name.Variable, Text, Punctuation), '#pop'),
(r'(%s)' % alphanumid_re, Name.Variable, '#pop'),
(r'(%s)' % symbolicid_re, Name.Variable, '#pop'),
# Ignore interesting patterns like 'val (x, y)'
(r'', Text, '#pop'),
# Dealing with what comes after the 'type' (or 'and') keyword
'tname': [
(r'\'[0-9a-zA-Z_\']*', Name.Decorator),
(r'\(', Punctuation, 'tyvarseq'),
(r'=(?!%s)' % symbolicid_re, Punctuation, ('#pop', 'typbind')),
(r'(%s)' % alphanumid_re, Keyword.Type),
(r'(%s)' % symbolicid_re, Keyword.Type),
(r'\S+', Error, '#pop'),
# A type binding includes most identifiers
'typbind': [
(r'\b(and)\b(?!\')', Keyword.Reserved, ('#pop', 'tname')),
(r'\S+', Error, '#pop'),
# Dealing with what comes after the 'datatype' (or 'and') keyword
'dname': [
(r'\'[0-9a-zA-Z_\']*', Name.Decorator),
(r'\(', Punctuation, 'tyvarseq'),
bygroups(Punctuation, Text, Keyword.Reserved), '#pop'),
(r'=(?!%s)' % symbolicid_re, Punctuation,
('#pop', 'datbind', 'datcon')),
(r'(%s)' % alphanumid_re, Keyword.Type),
(r'(%s)' % symbolicid_re, Keyword.Type),
(r'\S+', Error, '#pop'),
# common case - A | B | C of int
'datbind': [
(r'\b(and)\b(?!\')', Keyword.Reserved, ('#pop', 'dname')),
(r'\b(withtype)\b(?!\')', Keyword.Reserved, ('#pop', 'tname')),
(r'\b(of)\b(?!\')', Keyword.Reserved),
(r'(\|)(\s*)(%s)' % alphanumid_re,
bygroups(Punctuation, Text, Name.Class)),
(r'(\|)(\s+)(%s)' % symbolicid_re,
bygroups(Punctuation, Text, Name.Class)),
(r'\S+', Error),
# Dealing with what comes after an exception
'ename': [
(r'(exception|and)\b(\s+)(%s)' % alphanumid_re,
bygroups(Keyword.Reserved, Text, Name.Class)),
(r'(exception|and)\b(\s*)(%s)' % symbolicid_re,
bygroups(Keyword.Reserved, Text, Name.Class)),
(r'\b(of)\b(?!\')', Keyword.Reserved),
(r'\S+', Error),
'datcon': [
(r'(%s)' % alphanumid_re, Name.Class, '#pop'),
(r'(%s)' % symbolicid_re, Name.Class, '#pop'),
(r'\S+', Error, '#pop'),
# Series of type variables
'tyvarseq': [
(r'\s', Text),
(r'\(\*', Comment.Multiline, 'comment'),
(r'\'[0-9a-zA-Z_\']*', Name.Decorator),
(alphanumid_re, Name),
(r',', Punctuation),
(r'\)', Punctuation, '#pop'),
(symbolicid_re, Name),
'comment': [
(r'[^(*)]', Comment.Multiline),
(r'\(\*', Comment.Multiline, '#push'),
(r'\*\)', Comment.Multiline, '#pop'),
(r'[(*)]', Comment.Multiline),
class OcamlLexer(RegexLexer):
For the OCaml language.
*New in Pygments 0.7.*
name = 'OCaml'
aliases = ['ocaml']
filenames = ['*.ml', '*.mli', '*.mll', '*.mly']
mimetypes = ['text/x-ocaml']
keywords = [
'as', 'assert', 'begin', 'class', 'constraint', 'do', 'done',
'downto', 'else', 'end', 'exception', 'external', 'false',
'for', 'fun', 'function', 'functor', 'if', 'in', 'include',
'inherit', 'initializer', 'lazy', 'let', 'match', 'method',
'module', 'mutable', 'new', 'object', 'of', 'open', 'private',
'raise', 'rec', 'sig', 'struct', 'then', 'to', 'true', 'try',
'type', 'val', 'virtual', 'when', 'while', 'with'
keyopts = [
operators = r'[!$%&*+\./:<=>?@^|~-]'
word_operators = ['and', 'asr', 'land', 'lor', 'lsl', 'lxor', 'mod', 'or']
prefix_syms = r'[!?~]'
infix_syms = r'[=<>@^|&+\*/$%-]'
primitives = ['unit', 'int', 'float', 'bool', 'string', 'char', 'list', 'array']
tokens = {
'escape-sequence': [
(r'\\[\\\"\'ntbr]', String.Escape),
(r'\\[0-9]{3}', String.Escape),
(r'\\x[0-9a-fA-F]{2}', String.Escape),
'root': [
(r'\s+', Text),
(r'false|true|\(\)|\[\]', Name.Builtin.Pseudo),
Name.Namespace, 'dotted'),
(r'\b([A-Z][A-Za-z0-9_\']*)', Name.Class),
(r'\(\*', Comment, 'comment'),
(r'\b(%s)\b' % '|'.join(keywords), Keyword),
(r'(%s)' % '|'.join(keyopts), Operator),
(r'(%s|%s)?%s' % (infix_syms, prefix_syms, operators), Operator),
(r'\b(%s)\b' % '|'.join(word_operators), Operator.Word),
(r'\b(%s)\b' % '|'.join(primitives), Keyword.Type),
(r"[^\W\d][\w']*", Name),
(r'-?\d[\d_]*(.[\d_]*)?([eE][+\-]?\d[\d_]*)', Number.Float),
(r'0[xX][\da-fA-F][\da-fA-F_]*', Number.Hex),
(r'0[oO][0-7][0-7_]*', Number.Oct),
(r'0[bB][01][01_]*', Number.Binary),
(r'\d[\d_]*', Number.Integer),
(r"'(?:(\\[\\\"'ntbr ])|(\\[0-9]{3})|(\\x[0-9a-fA-F]{2}))'",
(r"'.'", String.Char),
(r"'", Keyword), # a stray quote is another syntax element
(r'"', String.Double, 'string'),
(r'[~?][a-z][\w\']*:', Name.Variable),
'comment': [
(r'[^(*)]+', Comment),
(r'\(\*', Comment, '#push'),
(r'\*\)', Comment, '#pop'),
(r'[(*)]', Comment),
'string': [
(r'[^\\"]+', String.Double),
(r'\\\n', String.Double),
(r'"', String.Double, '#pop'),
'dotted': [
(r'\s+', Text),
(r'\.', Punctuation),
(r'[A-Z][A-Za-z0-9_\']*(?=\s*\.)', Name.Namespace),
(r'[A-Z][A-Za-z0-9_\']*', Name.Class, '#pop'),
(r'[a-z_][A-Za-z0-9_\']*', Name, '#pop'),
class ErlangLexer(RegexLexer):
For the Erlang functional programming language.
Blame Jeremy Thurgood (
*New in Pygments 0.9.*
name = 'Erlang'
aliases = ['erlang']
filenames = ['*.erl', '*.hrl']
mimetypes = ['text/x-erlang']
keywords = [
'after', 'begin', 'case', 'catch', 'cond', 'end', 'fun', 'if',
'let', 'of', 'query', 'receive', 'try', 'when',
builtins = [ # See erlang(3) man page
'abs', 'append_element', 'apply', 'atom_to_list', 'binary_to_list',
'bitstring_to_list', 'binary_to_term', 'bit_size', 'bump_reductions',
'byte_size', 'cancel_timer', 'check_process_code', 'delete_module',
'demonitor', 'disconnect_node', 'display', 'element', 'erase', 'exit',
'float', 'float_to_list', 'fun_info', 'fun_to_list',
'function_exported', 'garbage_collect', 'get', 'get_keys',
'group_leader', 'hash', 'hd', 'integer_to_list', 'iolist_to_binary',
'iolist_size', 'is_atom', 'is_binary', 'is_bitstring', 'is_boolean',
'is_builtin', 'is_float', 'is_function', 'is_integer', 'is_list',
'is_number', 'is_pid', 'is_port', 'is_process_alive', 'is_record',
'is_reference', 'is_tuple', 'length', 'link', 'list_to_atom',
'list_to_binary', 'list_to_bitstring', 'list_to_existing_atom',
'list_to_float', 'list_to_integer', 'list_to_pid', 'list_to_tuple',
'load_module', 'localtime_to_universaltime', 'make_tuple', 'md5',
'md5_final', 'md5_update', 'memory', 'module_loaded', 'monitor',
'monitor_node', 'node', 'nodes', 'open_port', 'phash', 'phash2',
'pid_to_list', 'port_close', 'port_command', 'port_connect',
'port_control', 'port_call', 'port_info', 'port_to_list',
'process_display', 'process_flag', 'process_info', 'purge_module',
'put', 'read_timer', 'ref_to_list', 'register', 'resume_process',
'round', 'send', 'send_after', 'send_nosuspend', 'set_cookie',
'setelement', 'size', 'spawn', 'spawn_link', 'spawn_monitor',
'spawn_opt', 'split_binary', 'start_timer', 'statistics',
'suspend_process', 'system_flag', 'system_info', 'system_monitor',
'system_profile', 'term_to_binary', 'tl', 'trace', 'trace_delivered',
'trace_info', 'trace_pattern', 'trunc', 'tuple_size', 'tuple_to_list',
'universaltime_to_localtime', 'unlink', 'unregister', 'whereis'
operators = r'(\+|-|\*|/|<|>|=|==|/=|=:=|=/=|=<|>=|\+\+|--|<-|!|\?)'
word_operators = [
'and', 'andalso', 'band', 'bnot', 'bor', 'bsl', 'bsr', 'bxor',
'div', 'not', 'or', 'orelse', 'rem', 'xor'
atom_re = r"(?:[a-z][a-zA-Z0-9_]*|'[^\n']*[^\\]')"
variable_re = r'(?:[A-Z_][a-zA-Z0-9_]*)'
escape_re = r'(?:\\(?:[bdefnrstv\'"\\/]|[0-7][0-7]?[0-7]?|\^[a-zA-Z]))'
macro_re = r'(?:'+variable_re+r'|'+atom_re+r')'
base_re = r'(?:[2-9]|[12][0-9]|3[0-6])'
tokens = {
'root': [
(r'\s+', Text),
(r'%.*\n', Comment),
('(' + '|'.join(keywords) + r')\b', Keyword),
('(' + '|'.join(builtins) + r')\b', Name.Builtin),
('(' + '|'.join(word_operators) + r')\b', Operator.Word),
(r'^-', Punctuation, 'directive'),
(operators, Operator),
(r'"', String, 'string'),
(r'<<', Name.Label),
(r'>>', Name.Label),
(r'('+atom_re+')(:)', bygroups(Name.Namespace, Punctuation)),
(r'^('+atom_re+r')(\s*)(\()', bygroups(Name.Function, Text, Punctuation)),
(r'[+-]?'+base_re+r'#[0-9a-zA-Z]+', Number.Integer),
(r'[+-]?\d+', Number.Integer),
(r'[+-]?\d+.\d+', Number.Float),
(r'[]\[:_@\".{}()|;,]', Punctuation),
(variable_re, Name.Variable),
(atom_re, Name),
(r'\?'+macro_re, Name.Constant),
(r'\$(?:'+escape_re+r'|\\[ %]|[^\\])', String.Char),
(r'#'+atom_re+r'(:?\.'+atom_re+r')?', Name.Label),
'string': [
(escape_re, String.Escape),
(r'"', String, '#pop'),
(r'~[0-9.*]*[~#+bBcdefginpPswWxX]', String.Interpol),
(r'[^"\\~]+', String),
(r'~', String),
'directive': [
bygroups(Name.Entity, Text, Punctuation, Name.Constant), '#pop'),
bygroups(Name.Entity, Text, Punctuation, Name.Label), '#pop'),
(atom_re, Name.Entity, '#pop'),
class ErlangShellLexer(Lexer):
Shell sessions in erl (for Erlang code).
*New in Pygments 1.1.*
name = 'Erlang erl session'
aliases = ['erl']
filenames = ['*.erl-sh']
mimetypes = ['text/x-erl-shellsession']
_prompt_re = re.compile(r'\d+>(?=\s|\Z)')
def get_tokens_unprocessed(self, text):
erlexer = ErlangLexer(**self.options)
curcode = ''
insertions = []
for match in line_re.finditer(text):
line =
m = self._prompt_re.match(line)
if m is not None:
end = m.end()
[(0, Generic.Prompt, line[:end])]))
curcode += line[end:]
if curcode:
for item in do_insertions(insertions,
yield item
curcode = ''
insertions = []
if line.startswith('*'):
yield match.start(), Generic.Traceback, line
yield match.start(), Generic.Output, line
if curcode:
for item in do_insertions(insertions,
yield item
class NewLispLexer(RegexLexer):
For `newLISP. <>`_ source code (version 10.3.0).
name = 'NewLisp'
aliases = ['newLISP', 'newlisp']
filenames = ['*.lsp', '*.nl']
mimetypes = ['text/x-newlisp', 'application/x-newlisp']
# list of built-in functions for newLISP version 10.3
builtins = [
'^', '--', '-', ':', '!', '!=', '?', '@', '*', '/', '&', '%', '+', '++', '<', '<<', '<=', '=', '>', '>=', '>>', '|', '~', '$', '$0', '$1', '$10', '$11', '$12', '$13', '$14', '$15', '$2', '$3', '$4', '$5', '$6', '$7', '$8', '$9', '$args', '$idx', '$it', '$main-args', 'abort', 'abs', 'acos', 'acosh', 'add', 'address', 'amb', 'and', 'and', 'append-file', 'append', 'apply', 'args', 'array-list', 'array?', 'array', 'asin', 'asinh', 'assoc', 'atan', 'atan2', 'atanh', 'atom?', 'base64-dec', 'base64-enc', 'bayes-query', 'bayes-train', 'begin', 'begin', 'begin', 'beta', 'betai', 'bind', 'binomial', 'bits', 'callback', 'case', 'case', 'case', 'catch', 'ceil', 'change-dir', 'char', 'chop', 'Class', 'clean', 'close', 'command-event', 'cond', 'cond', 'cond', 'cons', 'constant', 'context?', 'context', 'copy-file', 'copy', 'cos', 'cosh', 'count', 'cpymem', 'crc32', 'crit-chi2', 'crit-z', 'current-line', 'curry', 'date-list', 'date-parse', 'date-value', 'date', 'debug', 'dec', 'def-new', 'default', 'define-macro', 'define-macro', 'define', 'delete-file', 'delete-url', 'delete', 'destroy', 'det', 'device', 'difference', 'directory?', 'directory', 'div', 'do-until', 'do-while', 'doargs', 'dolist', 'dostring', 'dotimes', 'dotree', 'dump', 'dup', 'empty?', 'encrypt', 'ends-with', 'env', 'erf', 'error-event', 'eval-string', 'eval', 'exec', 'exists', 'exit', 'exp', 'expand', 'explode', 'extend', 'factor', 'fft', 'file-info', 'file?', 'filter', 'find-all', 'find', 'first', 'flat', 'float?', 'float', 'floor', 'flt', 'fn', 'for-all', 'for', 'fork', 'format', 'fv', 'gammai', 'gammaln', 'gcd', 'get-char', 'get-float', 'get-int', 'get-long', 'get-string', 'get-url', 'global?', 'global', 'if-not', 'if', 'ifft', 'import', 'inc', 'index', 'inf?', 'int', 'integer?', 'integer', 'intersect', 'invert', 'irr', 'join', 'lambda-macro', 'lambda?', 'lambda', 'last-error', 'last', 'legal?', 'length', 'let', 'let', 'let', 'letex', 'letn', 'letn', 'letn', 'list?', 'list', 'load', 'local', 'log', 'lookup', 'lower-case', 'macro?', 'main-args', 'MAIN', 'make-dir', 'map', 'mat', 'match', 'max', 'member', 'min', 'mod', 'module', 'mul', 'multiply', 'NaN?', 'net-accept', 'net-close', 'net-connect', 'net-error', 'net-eval', 'net-interface', 'net-ipv', 'net-listen', 'net-local', 'net-lookup', 'net-packet', 'net-peek', 'net-peer', 'net-ping', 'net-receive-from', 'net-receive-udp', 'net-receive', 'net-select', 'net-send-to', 'net-send-udp', 'net-send', 'net-service', 'net-sessions', 'new', 'nil?', 'nil', 'normal', 'not', 'now', 'nper', 'npv', 'nth', 'null?', 'number?', 'open', 'or', 'ostype', 'pack', 'parse-date', 'parse', 'peek', 'pipe', 'pmt', 'pop-assoc', 'pop', 'post-url', 'pow', 'prefix', 'pretty-print', 'primitive?', 'print', 'println', 'prob-chi2', 'prob-z', 'process', 'prompt-event', 'protected?', 'push', 'put-url', 'pv', 'quote?', 'quote', 'rand', 'random', 'randomize', 'read', 'read-char', 'read-expr', 'read-file', 'read-key', 'read-line', 'read-utf8', 'read', 'reader-event', 'real-path', 'receive', 'ref-all', 'ref', 'regex-comp', 'regex', 'remove-dir', 'rename-file', 'replace', 'reset', 'rest', 'reverse', 'rotate', 'round', 'save', 'search', 'seed', 'seek', 'select', 'self', 'semaphore', 'send', 'sequence', 'series', 'set-locale', 'set-ref-all', 'set-ref', 'set', 'setf', 'setq', 'sgn', 'share', 'signal', 'silent', 'sin', 'sinh', 'sleep', 'slice', 'sort', 'source', 'spawn', 'sqrt', 'starts-with', 'string?', 'string', 'sub', 'swap', 'sym', 'symbol?', 'symbols', 'sync', 'sys-error', 'sys-info', 'tan', 'tanh', 'term', 'throw-error', 'throw', 'time-of-day', 'time', 'timer', 'title-case', 'trace-highlight', 'trace', 'transpose', 'Tree', 'trim', 'true?', 'true', 'unicode', 'unify', 'unique', 'unless', 'unpack', 'until', 'upper-case', 'utf8', 'utf8len', 'uuid', 'wait-pid', 'when', 'while', 'write', 'write-char', 'write-file', 'write-line', 'write', 'xfer-event', 'xml-error', 'xml-parse', 'xml-type-tags', 'zero?', "unless"
# valid names
valid_name = r'([a-zA-Z0-9!$%&*+.,/<=>?@^_~|-])+|(\[.*?\])+'
tokens = {
'root': [
# shebang
(r'#!(.*?)$', Comment.Preproc),
# comments starting with semicolon
(r';.*$', Comment.Single),
# comments starting with #
(r'#.*$', Comment.Single),
# whitespace
(r'\s+', Text),
# strings, symbols and characters
(r'"(\\\\|\\"|[^"])*"', String),
# braces
(r"{", String, "bracestring"),
# [text] ... [/text] delimited strings
(r'\[text\]*', String, "tagstring"),
# 'special' operators...
(r"('|:)", Operator),
# highlight the builtins
('(%s)' % '|'.join([
re.escape(entry) + ' ' for entry in builtins]),
# the remaining functions
(r'(?<=\()' + valid_name, Name.Variable),
# the remaining variables
(valid_name, String.Symbol),
# parentheses
(r'(\(|\))', Punctuation),
# braced strings...
'bracestring': [
("{", String, "#push"),
("}", String, "#pop"),
("[^{}]+", String),
# tagged [text]...[/text] delimited strings...
'tagstring': [
(r'(?s)(.*?)(\[/text\])', String, '#pop'),
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