Add lexer for Pointless (#1494)

* add lexer for pointless

* lexer docstring formatting

* added link to languages doc

* update authors

* update version

* added double string

* added upval keyword

* simplify ptls example code

* rename doubleString -> multiString

2 files changed, 71 insertions, 0 deletions

diff --git a/pygments/lexers/_mapping.py b/pygments/lexers/_mapping.py
index 9cdddb6a..b98f3de4 100644
--- a/pygments/lexers/_mapping.py
+++ b/pygments/lexers/_mapping.py
@@ -339,6 +339,7 @@ LEXERS = {
     'PikeLexer': ('pygments.lexers.c_like', 'Pike', ('pike',), ('*.pike', '*.pmod'), ('text/x-pike',)),
     'PkgConfigLexer': ('pygments.lexers.configs', 'PkgConfig', ('pkgconfig',), ('*.pc',), ()),
     'PlPgsqlLexer': ('pygments.lexers.sql', 'PL/pgSQL', ('plpgsql',), (), ('text/x-plpgsql',)),
+    'PointlessLexer': ('pygments.lexers.pointless', 'Pointless', ('pointless',), ('*.ptls',), ()),
     'PonyLexer': ('pygments.lexers.pony', 'Pony', ('pony',), ('*.pony',), ()),
     'PostScriptLexer': ('pygments.lexers.graphics', 'PostScript', ('postscript', 'postscr'), ('*.ps', '*.eps'), ('application/postscript',)),
     'PostgresConsoleLexer': ('pygments.lexers.sql', 'PostgreSQL console (psql)', ('psql', 'postgresql-console', 'postgres-console'), (), ('text/x-postgresql-psql',)),
diff --git a/pygments/lexers/pointless.py b/pygments/lexers/pointless.py
new file mode 100644
index 00000000..a0a5cefa
--- /dev/null
+++ b/pygments/lexers/pointless.py
@@ -0,0 +1,70 @@
+# -*- coding: utf-8 -*-
+"""
+    pygments.lexers.pointless
+    ~~~~~~~~~~~~~~~~~~~~
+
+    Lexers for Pointless.
+
+    :copyright: Copyright 2006-2019 by the Pygments team, see AUTHORS.
+    :license: BSD, see LICENSE for details.
+"""
+
+from pygments.lexer import RegexLexer, bygroups, words
+from pygments.token import *
+
+__all__ = ['PointlessLexer']
+
+
+class PointlessLexer(RegexLexer):
+    """
+    For `Pointless <https://ptls.dev>`_ source code.
+
+    .. versionadded:: 2.7
+    """
+
+    name = 'Pointless'
+    aliases = ['pointless']
+    filenames = ['*.ptls']
+
+    ops = words([
+        "+", "-", "*", "/", "**", "%", "+=", "-=", "*=",
+        "/=", "**=", "%=", "|>", "=", "==", "!=", "<", ">",
+        "<=", ">=", "=>", "$", "++",
+    ])
+
+    keywords = words([
+        "if", "then", "else", "where", "with", "cond",
+        "case", "and", "or", "not", "in", "as", "for",
+        "requires", "throw", "try", "catch", "when",
+        "yield", "upval",
+    ], suffix=r'\b')
+
+    tokens = {
+        'root': [
+            (r'[ \n\r]+', Text),
+            (r'--.*$', Comment.Single),
+            (r'"""', String, 'multiString'),
+            (r'"', String, 'string'),
+            (r'[\[\](){}:;,.]', Punctuation),
+            (ops, Operator),
+            (keywords, Keyword),
+            (r'\d+|\d*\.\d+', Number),
+            (r'(true|false)\b', Name.Builtin),
+            (r'[A-Z][a-zA-Z0-9]*\b', String.Symbol),
+            (r'output\b', Name.Variable.Magic),
+            (r'(export|import)\b', Keyword.Namespace),
+            (r'[a-z][a-zA-Z0-9]*\b', Name.Variable)
+        ],
+        'multiString': [
+            (r'\\.', String.Escape),
+            (r'"""', String, '#pop'),
+            (r'"', String),
+            (r'[^\\"]+', String),
+        ],
+        'string': [
+            (r'\\.', String.Escape),
+            (r'"', String, '#pop'),
+            (r'\n', Error),
+            (r'[^\\"]+', String),
+        ],
+    }