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Code Editor : pascal.py

"""
    pygments.lexers.pascal
    ~~~~~~~~~~~~~~~~~~~~~~

Lexers for Pascal family 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, bygroups, words, \
    using, this, default
from pygments.util import get_bool_opt, get_list_opt
from pygments.token import Text, Comment, Operator, Keyword, Name, String, \
    Number, Punctuation, Error
from pygments.scanner import Scanner

# compatibility import
from pygments.lexers.modula2 import Modula2Lexer

__all__ = ['DelphiLexer', 'AdaLexer']

class DelphiLexer(Lexer):
    """
    For `Delphi <http://www.borland.com/delphi/>`_ (Borland Object Pascal),
    Turbo Pascal and Free Pascal source code.

Additional options accepted:

`turbopascal`
        Highlight Turbo Pascal specific keywords (default: ``True``).
    `delphi`
        Highlight Borland Delphi specific keywords (default: ``True``).
    `freepascal`
        Highlight Free Pascal specific keywords (default: ``True``).
    `units`
        A list of units that should be considered builtin, supported are
        ``System``, ``SysUtils``, ``Classes`` and ``Math``.
        Default is to consider all of them builtin.
    """
    name = 'Delphi'
    aliases = ['delphi', 'pas', 'pascal', 'objectpascal']
    filenames = ['*.pas', '*.dpr']
    mimetypes = ['text/x-pascal']

TURBO_PASCAL_KEYWORDS = (
        'absolute', 'and', 'array', 'asm', 'begin', 'break', 'case',
        'const', 'constructor', 'continue', 'destructor', 'div', 'do',
        'downto', 'else', 'end', 'file', 'for', 'function', 'goto',
        'if', 'implementation', 'in', 'inherited', 'inline', 'interface',
        'label', 'mod', 'nil', 'not', 'object', 'of', 'on', 'operator',
        'or', 'packed', 'procedure', 'program', 'record', 'reintroduce',
        'repeat', 'self', 'set', 'shl', 'shr', 'string', 'then', 'to',
        'type', 'unit', 'until', 'uses', 'var', 'while', 'with', 'xor'
    )

DELPHI_KEYWORDS = (
        'as', 'class', 'except', 'exports', 'finalization', 'finally',
        'initialization', 'is', 'library', 'on', 'property', 'raise',
        'threadvar', 'try'
    )

FREE_PASCAL_KEYWORDS = (
        'dispose', 'exit', 'false', 'new', 'true'
    )

BLOCK_KEYWORDS = {
        'begin', 'class', 'const', 'constructor', 'destructor', 'end',
        'finalization', 'function', 'implementation', 'initialization',
        'label', 'library', 'operator', 'procedure', 'program', 'property',
        'record', 'threadvar', 'type', 'unit', 'uses', 'var'
    }

FUNCTION_MODIFIERS = {
        'alias', 'cdecl', 'export', 'inline', 'interrupt', 'nostackframe',
        'pascal', 'register', 'safecall', 'softfloat', 'stdcall',
        'varargs', 'name', 'dynamic', 'near', 'virtual', 'external',
        'override', 'assembler'
    }

# XXX: those aren't global. but currently we know no way for defining
    #      them just for the type context.
    DIRECTIVES = {
        'absolute', 'abstract', 'assembler', 'cppdecl', 'default', 'far',
        'far16', 'forward', 'index', 'oldfpccall', 'private', 'protected',
        'published', 'public'
    }

BUILTIN_TYPES = {
        'ansichar', 'ansistring', 'bool', 'boolean', 'byte', 'bytebool',
        'cardinal', 'char', 'comp', 'currency', 'double', 'dword',
        'extended', 'int64', 'integer', 'iunknown', 'longbool', 'longint',
        'longword', 'pansichar', 'pansistring', 'pbool', 'pboolean',
        'pbyte', 'pbytearray', 'pcardinal', 'pchar', 'pcomp', 'pcurrency',
        'pdate', 'pdatetime', 'pdouble', 'pdword', 'pextended', 'phandle',
        'pint64', 'pinteger', 'plongint', 'plongword', 'pointer',
        'ppointer', 'pshortint', 'pshortstring', 'psingle', 'psmallint',
        'pstring', 'pvariant', 'pwidechar', 'pwidestring', 'pword',
        'pwordarray', 'pwordbool', 'real', 'real48', 'shortint',
        'shortstring', 'single', 'smallint', 'string', 'tclass', 'tdate',
        'tdatetime', 'textfile', 'thandle', 'tobject', 'ttime', 'variant',
        'widechar', 'widestring', 'word', 'wordbool'
    }

BUILTIN_UNITS = {
        'System': (
            'abs', 'acquireexceptionobject', 'addr', 'ansitoutf8',
            'append', 'arctan', 'assert', 'assigned', 'assignfile',
            'beginthread', 'blockread', 'blockwrite', 'break', 'chdir',
            'chr', 'close', 'closefile', 'comptocurrency', 'comptodouble',
            'concat', 'continue', 'copy', 'cos', 'dec', 'delete',
            'dispose', 'doubletocomp', 'endthread', 'enummodules',
            'enumresourcemodules', 'eof', 'eoln', 'erase', 'exceptaddr',
            'exceptobject', 'exclude', 'exit', 'exp', 'filepos', 'filesize',
            'fillchar', 'finalize', 'findclasshinstance', 'findhinstance',
            'findresourcehinstance', 'flush', 'frac', 'freemem',
            'get8087cw', 'getdir', 'getlasterror', 'getmem',
            'getmemorymanager', 'getmodulefilename', 'getvariantmanager',
            'halt', 'hi', 'high', 'inc', 'include', 'initialize', 'insert',
            'int', 'ioresult', 'ismemorymanagerset', 'isvariantmanagerset',
            'length', 'ln', 'lo', 'low', 'mkdir', 'move', 'new', 'odd',
            'olestrtostring', 'olestrtostrvar', 'ord', 'paramcount',
            'paramstr', 'pi', 'pos', 'pred', 'ptr', 'pucs4chars', 'random',
            'randomize', 'read', 'readln', 'reallocmem',
            'releaseexceptionobject', 'rename', 'reset', 'rewrite', 'rmdir',
            'round', 'runerror', 'seek', 'seekeof', 'seekeoln',
            'set8087cw', 'setlength', 'setlinebreakstyle',
            'setmemorymanager', 'setstring', 'settextbuf',
            'setvariantmanager', 'sin', 'sizeof', 'slice', 'sqr', 'sqrt',
            'str', 'stringofchar', 'stringtoolestr', 'stringtowidechar',
            'succ', 'swap', 'trunc', 'truncate', 'typeinfo',
            'ucs4stringtowidestring', 'unicodetoutf8', 'uniquestring',
            'upcase', 'utf8decode', 'utf8encode', 'utf8toansi',
            'utf8tounicode', 'val', 'vararrayredim', 'varclear',
            'widecharlentostring', 'widecharlentostrvar',
            'widechartostring', 'widechartostrvar',
            'widestringtoucs4string', 'write', 'writeln'
        ),
        'SysUtils': (
            'abort', 'addexitproc', 'addterminateproc', 'adjustlinebreaks',
            'allocmem', 'ansicomparefilename', 'ansicomparestr',
            'ansicomparetext', 'ansidequotedstr', 'ansiextractquotedstr',
            'ansilastchar', 'ansilowercase', 'ansilowercasefilename',
            'ansipos', 'ansiquotedstr', 'ansisamestr', 'ansisametext',
            'ansistrcomp', 'ansistricomp', 'ansistrlastchar', 'ansistrlcomp',
            'ansistrlicomp', 'ansistrlower', 'ansistrpos', 'ansistrrscan',
            'ansistrscan', 'ansistrupper', 'ansiuppercase',
            'ansiuppercasefilename', 'appendstr', 'assignstr', 'beep',
            'booltostr', 'bytetocharindex', 'bytetocharlen', 'bytetype',
            'callterminateprocs', 'changefileext', 'charlength',
            'chartobyteindex', 'chartobytelen', 'comparemem', 'comparestr',
            'comparetext', 'createdir', 'createguid', 'currentyear',
            'currtostr', 'currtostrf', 'date', 'datetimetofiledate',
            'datetimetostr', 'datetimetostring', 'datetimetosystemtime',
            'datetimetotimestamp', 'datetostr', 'dayofweek', 'decodedate',
            'decodedatefully', 'decodetime', 'deletefile', 'directoryexists',
            'diskfree', 'disksize', 'disposestr', 'encodedate', 'encodetime',
            'exceptionerrormessage', 'excludetrailingbackslash',
            'excludetrailingpathdelimiter', 'expandfilename',
            'expandfilenamecase', 'expanduncfilename', 'extractfiledir',
            'extractfiledrive', 'extractfileext', 'extractfilename',
            'extractfilepath', 'extractrelativepath', 'extractshortpathname',
            'fileage', 'fileclose', 'filecreate', 'filedatetodatetime',
            'fileexists', 'filegetattr', 'filegetdate', 'fileisreadonly',
            'fileopen', 'fileread', 'filesearch', 'fileseek', 'filesetattr',
            'filesetdate', 'filesetreadonly', 'filewrite', 'finalizepackage',
            'findclose', 'findcmdlineswitch', 'findfirst', 'findnext',
            'floattocurr', 'floattodatetime', 'floattodecimal', 'floattostr',
            'floattostrf', 'floattotext', 'floattotextfmt', 'fmtloadstr',
            'fmtstr', 'forcedirectories', 'format', 'formatbuf', 'formatcurr',
            'formatdatetime', 'formatfloat', 'freeandnil', 'getcurrentdir',
            'getenvironmentvariable', 'getfileversion', 'getformatsettings',
            'getlocaleformatsettings', 'getmodulename', 'getpackagedescription',
            'getpackageinfo', 'gettime', 'guidtostring', 'incamonth',
            'includetrailingbackslash', 'includetrailingpathdelimiter',
            'incmonth', 'initializepackage', 'interlockeddecrement',
            'interlockedexchange', 'interlockedexchangeadd',
            'interlockedincrement', 'inttohex', 'inttostr', 'isdelimiter',
            'isequalguid', 'isleapyear', 'ispathdelimiter', 'isvalidident',
            'languages', 'lastdelimiter', 'loadpackage', 'loadstr',
            'lowercase', 'msecstotimestamp', 'newstr', 'nextcharindex', 'now',
            'outofmemoryerror', 'quotedstr', 'raiselastoserror',
            'raiselastwin32error', 'removedir', 'renamefile', 'replacedate',
            'replacetime', 'safeloadlibrary', 'samefilename', 'sametext',
            'setcurrentdir', 'showexception', 'sleep', 'stralloc', 'strbufsize',
            'strbytetype', 'strcat', 'strcharlength', 'strcomp', 'strcopy',
            'strdispose', 'strecopy', 'strend', 'strfmt', 'stricomp',
            'stringreplace', 'stringtoguid', 'strlcat', 'strlcomp', 'strlcopy',
            'strlen', 'strlfmt', 'strlicomp', 'strlower', 'strmove', 'strnew',
            'strnextchar', 'strpas', 'strpcopy', 'strplcopy', 'strpos',
            'strrscan', 'strscan', 'strtobool', 'strtobooldef', 'strtocurr',
            'strtocurrdef', 'strtodate', 'strtodatedef', 'strtodatetime',
            'strtodatetimedef', 'strtofloat', 'strtofloatdef', 'strtoint',
            'strtoint64', 'strtoint64def', 'strtointdef', 'strtotime',
            'strtotimedef', 'strupper', 'supports', 'syserrormessage',
            'systemtimetodatetime', 'texttofloat', 'time', 'timestamptodatetime',
            'timestamptomsecs', 'timetostr', 'trim', 'trimleft', 'trimright',
            'tryencodedate', 'tryencodetime', 'tryfloattocurr', 'tryfloattodatetime',
            'trystrtobool', 'trystrtocurr', 'trystrtodate', 'trystrtodatetime',
            'trystrtofloat', 'trystrtoint', 'trystrtoint64', 'trystrtotime',
            'unloadpackage', 'uppercase', 'widecomparestr', 'widecomparetext',
            'widefmtstr', 'wideformat', 'wideformatbuf', 'widelowercase',
            'widesamestr', 'widesametext', 'wideuppercase', 'win32check',
            'wraptext'
        ),
        'Classes': (
            'activateclassgroup', 'allocatehwnd', 'bintohex', 'checksynchronize',
            'collectionsequal', 'countgenerations', 'deallocatehwnd', 'equalrect',
            'extractstrings', 'findclass', 'findglobalcomponent', 'getclass',
            'groupdescendantswith', 'hextobin', 'identtoint',
            'initinheritedcomponent', 'inttoident', 'invalidpoint',
            'isuniqueglobalcomponentname', 'linestart', 'objectbinarytotext',
            'objectresourcetotext', 'objecttexttobinary', 'objecttexttoresource',
            'pointsequal', 'readcomponentres', 'readcomponentresex',
            'readcomponentresfile', 'rect', 'registerclass', 'registerclassalias',
            'registerclasses', 'registercomponents', 'registerintegerconsts',
            'registernoicon', 'registernonactivex', 'smallpoint', 'startclassgroup',
            'teststreamformat', 'unregisterclass', 'unregisterclasses',
            'unregisterintegerconsts', 'unregistermoduleclasses',
            'writecomponentresfile'
        ),
        'Math': (
            'arccos', 'arccosh', 'arccot', 'arccoth', 'arccsc', 'arccsch', 'arcsec',
            'arcsech', 'arcsin', 'arcsinh', 'arctan2', 'arctanh', 'ceil',
            'comparevalue', 'cosecant', 'cosh', 'cot', 'cotan', 'coth', 'csc',
            'csch', 'cycletodeg', 'cycletograd', 'cycletorad', 'degtocycle',
            'degtograd', 'degtorad', 'divmod', 'doubledecliningbalance',
            'ensurerange', 'floor', 'frexp', 'futurevalue', 'getexceptionmask',
            'getprecisionmode', 'getroundmode', 'gradtocycle', 'gradtodeg',
            'gradtorad', 'hypot', 'inrange', 'interestpayment', 'interestrate',
            'internalrateofreturn', 'intpower', 'isinfinite', 'isnan', 'iszero',
            'ldexp', 'lnxp1', 'log10', 'log2', 'logn', 'max', 'maxintvalue',
            'maxvalue', 'mean', 'meanandstddev', 'min', 'minintvalue', 'minvalue',
            'momentskewkurtosis', 'netpresentvalue', 'norm', 'numberofperiods',
            'payment', 'periodpayment', 'poly', 'popnstddev', 'popnvariance',
            'power', 'presentvalue', 'radtocycle', 'radtodeg', 'radtograd',
            'randg', 'randomrange', 'roundto', 'samevalue', 'sec', 'secant',
            'sech', 'setexceptionmask', 'setprecisionmode', 'setroundmode',
            'sign', 'simpleroundto', 'sincos', 'sinh', 'slndepreciation', 'stddev',
            'sum', 'sumint', 'sumofsquares', 'sumsandsquares', 'syddepreciation',
            'tan', 'tanh', 'totalvariance', 'variance'
        )
    }

ASM_REGISTERS = {
        'ah', 'al', 'ax', 'bh', 'bl', 'bp', 'bx', 'ch', 'cl', 'cr0',
        'cr1', 'cr2', 'cr3', 'cr4', 'cs', 'cx', 'dh', 'di', 'dl', 'dr0',
        'dr1', 'dr2', 'dr3', 'dr4', 'dr5', 'dr6', 'dr7', 'ds', 'dx',
        'eax', 'ebp', 'ebx', 'ecx', 'edi', 'edx', 'es', 'esi', 'esp',
        'fs', 'gs', 'mm0', 'mm1', 'mm2', 'mm3', 'mm4', 'mm5', 'mm6',
        'mm7', 'si', 'sp', 'ss', 'st0', 'st1', 'st2', 'st3', 'st4', 'st5',
        'st6', 'st7', 'xmm0', 'xmm1', 'xmm2', 'xmm3', 'xmm4', 'xmm5',
        'xmm6', 'xmm7'
    }

ASM_INSTRUCTIONS = {
        'aaa', 'aad', 'aam', 'aas', 'adc', 'add', 'and', 'arpl', 'bound',
        'bsf', 'bsr', 'bswap', 'bt', 'btc', 'btr', 'bts', 'call', 'cbw',
        'cdq', 'clc', 'cld', 'cli', 'clts', 'cmc', 'cmova', 'cmovae',
        'cmovb', 'cmovbe', 'cmovc', 'cmovcxz', 'cmove', 'cmovg',
        'cmovge', 'cmovl', 'cmovle', 'cmovna', 'cmovnae', 'cmovnb',
        'cmovnbe', 'cmovnc', 'cmovne', 'cmovng', 'cmovnge', 'cmovnl',
        'cmovnle', 'cmovno', 'cmovnp', 'cmovns', 'cmovnz', 'cmovo',
        'cmovp', 'cmovpe', 'cmovpo', 'cmovs', 'cmovz', 'cmp', 'cmpsb',
        'cmpsd', 'cmpsw', 'cmpxchg', 'cmpxchg486', 'cmpxchg8b', 'cpuid',
        'cwd', 'cwde', 'daa', 'das', 'dec', 'div', 'emms', 'enter', 'hlt',
        'ibts', 'icebp', 'idiv', 'imul', 'in', 'inc', 'insb', 'insd',
        'insw', 'int', 'int01', 'int03', 'int1', 'int3', 'into', 'invd',
        'invlpg', 'iret', 'iretd', 'iretw', 'ja', 'jae', 'jb', 'jbe',
        'jc', 'jcxz', 'jcxz', 'je', 'jecxz', 'jg', 'jge', 'jl', 'jle',
        'jmp', 'jna', 'jnae', 'jnb', 'jnbe', 'jnc', 'jne', 'jng', 'jnge',
        'jnl', 'jnle', 'jno', 'jnp', 'jns', 'jnz', 'jo', 'jp', 'jpe',
        'jpo', 'js', 'jz', 'lahf', 'lar', 'lcall', 'lds', 'lea', 'leave',
        'les', 'lfs', 'lgdt', 'lgs', 'lidt', 'ljmp', 'lldt', 'lmsw',
        'loadall', 'loadall286', 'lock', 'lodsb', 'lodsd', 'lodsw',
        'loop', 'loope', 'loopne', 'loopnz', 'loopz', 'lsl', 'lss', 'ltr',
        'mov', 'movd', 'movq', 'movsb', 'movsd', 'movsw', 'movsx',
        'movzx', 'mul', 'neg', 'nop', 'not', 'or', 'out', 'outsb', 'outsd',
        'outsw', 'pop', 'popa', 'popad', 'popaw', 'popf', 'popfd', 'popfw',
        'push', 'pusha', 'pushad', 'pushaw', 'pushf', 'pushfd', 'pushfw',
        'rcl', 'rcr', 'rdmsr', 'rdpmc', 'rdshr', 'rdtsc', 'rep', 'repe',
        'repne', 'repnz', 'repz', 'ret', 'retf', 'retn', 'rol', 'ror',
        'rsdc', 'rsldt', 'rsm', 'sahf', 'sal', 'salc', 'sar', 'sbb',
        'scasb', 'scasd', 'scasw', 'seta', 'setae', 'setb', 'setbe',
        'setc', 'setcxz', 'sete', 'setg', 'setge', 'setl', 'setle',
        'setna', 'setnae', 'setnb', 'setnbe', 'setnc', 'setne', 'setng',
        'setnge', 'setnl', 'setnle', 'setno', 'setnp', 'setns', 'setnz',
        'seto', 'setp', 'setpe', 'setpo', 'sets', 'setz', 'sgdt', 'shl',
        'shld', 'shr', 'shrd', 'sidt', 'sldt', 'smi', 'smint', 'smintold',
        'smsw', 'stc', 'std', 'sti', 'stosb', 'stosd', 'stosw', 'str',
        'sub', 'svdc', 'svldt', 'svts', 'syscall', 'sysenter', 'sysexit',
        'sysret', 'test', 'ud1', 'ud2', 'umov', 'verr', 'verw', 'wait',
        'wbinvd', 'wrmsr', 'wrshr', 'xadd', 'xbts', 'xchg', 'xlat',
        'xlatb', 'xor'
    }

def __init__(self, **options):
        Lexer.__init__(self, **options)
        self.keywords = set()
        if get_bool_opt(options, 'turbopascal', True):
            self.keywords.update(self.TURBO_PASCAL_KEYWORDS)
        if get_bool_opt(options, 'delphi', True):
            self.keywords.update(self.DELPHI_KEYWORDS)
        if get_bool_opt(options, 'freepascal', True):
            self.keywords.update(self.FREE_PASCAL_KEYWORDS)
        self.builtins = set()
        for unit in get_list_opt(options, 'units', list(self.BUILTIN_UNITS)):
            self.builtins.update(self.BUILTIN_UNITS[unit])

def get_tokens_unprocessed(self, text):
        scanner = Scanner(text, re.DOTALL | re.MULTILINE | re.IGNORECASE)
        stack = ['initial']
        in_function_block = False
        in_property_block = False
        was_dot = False
        next_token_is_function = False
        next_token_is_property = False
        collect_labels = False
        block_labels = set()
        brace_balance = [0, 0]

while not scanner.eos:
            token = Error

if stack[-1] == 'initial':
                if scanner.scan(r'\s+'):
                    token = Text
                elif scanner.scan(r'\{.*?\}|$\*.*?\*$'):
                    if scanner.match.startswith('$'):
                        token = Comment.Preproc
                    else:
                        token = Comment.Multiline
                elif scanner.scan(r'//.*?$'):
                    token = Comment.Single
                elif scanner.scan(r'[-+*\/=<>:;,.@\^]'):
                    token = Operator
                    # stop label highlighting on next ";"
                    if collect_labels and scanner.match == ';':
                        collect_labels = False
                elif scanner.scan(r'[\[\]]+'):
                    token = Punctuation
                    # abort function naming ``foo = Function(...)``
                    next_token_is_function = False
                    # if we are in a function block we count the open
                    # braces because ootherwise it's impossible to
                    # determine the end of the modifier context
                    if in_function_block or in_property_block:
                        if scanner.match == '(':
                            brace_balance[0] += 1
                        elif scanner.match == ')':
                            brace_balance[0] -= 1
                        elif scanner.match == '[':
                            brace_balance[1] += 1
                        elif scanner.match == ']':
                            brace_balance[1] -= 1
                elif scanner.scan(r'[A-Za-z_][A-Za-z_0-9]*'):
                    lowercase_name = scanner.match.lower()
                    if lowercase_name == 'result':
                        token = Name.Builtin.Pseudo
                    elif lowercase_name in self.keywords:
                        token = Keyword
                        # if we are in a special block and a
                        # block ending keyword occours (and the parenthesis
                        # is balanced) we end the current block context
                        if (in_function_block or in_property_block) and \
                           lowercase_name in self.BLOCK_KEYWORDS and \
                           brace_balance[0] <= 0 and \
                           brace_balance[1] <= 0:
                            in_function_block = False
                            in_property_block = False
                            brace_balance = [0, 0]
                            block_labels = set()
                        if lowercase_name in ('label', 'goto'):
                            collect_labels = True
                        elif lowercase_name == 'asm':
                            stack.append('asm')
                        elif lowercase_name == 'property':
                            in_property_block = True
                            next_token_is_property = True
                        elif lowercase_name in ('procedure', 'operator',
                                                'function', 'constructor',
                                                'destructor'):
                            in_function_block = True
                            next_token_is_function = True
                    # we are in a function block and the current name
                    # is in the set of registered modifiers. highlight
                    # it as pseudo keyword
                    elif in_function_block and \
                            lowercase_name in self.FUNCTION_MODIFIERS:
                        token = Keyword.Pseudo
                    # if we are in a property highlight some more
                    # modifiers
                    elif in_property_block and \
                            lowercase_name in ('read', 'write'):
                        token = Keyword.Pseudo
                        next_token_is_function = True
                    # if the last iteration set next_token_is_function
                    # to true we now want this name highlighted as
                    # function. so do that and reset the state
                    elif next_token_is_function:
                        # Look if the next token is a dot. If yes it's
                        # not a function, but a class name and the
                        # part after the dot a function name
                        if scanner.test(r'\s*\.\s*'):
                            token = Name.Class
                        # it's not a dot, our job is done
                        else:
                            token = Name.Function
                            next_token_is_function = False
                    # same for properties
                    elif next_token_is_property:
                        token = Name.Property
                        next_token_is_property = False
                    # Highlight this token as label and add it
                    # to the list of known labels
                    elif collect_labels:
                        token = Name.Label
                        block_labels.add(scanner.match.lower())
                    # name is in list of known labels
                    elif lowercase_name in block_labels:
                        token = Name.Label
                    elif lowercase_name in self.BUILTIN_TYPES:
                        token = Keyword.Type
                    elif lowercase_name in self.DIRECTIVES:
                        token = Keyword.Pseudo
                    # builtins are just builtins if the token
                    # before isn't a dot
                    elif not was_dot and lowercase_name in self.builtins:
                        token = Name.Builtin
                    else:
                        token = Name
                elif scanner.scan(r"'"):
                    token = String
                    stack.append('string')
                elif scanner.scan(r'\#(\d+|\$[0-9A-Fa-f]+)'):
                    token = String.Char
                elif scanner.scan(r'\$[0-9A-Fa-f]+'):
                    token = Number.Hex
                elif scanner.scan(r'\d+(?![eE]|\.[^.])'):
                    token = Number.Integer
                elif scanner.scan(r'\d+(\.\d+([eE][+-]?\d+)?|[eE][+-]?\d+)'):
                    token = Number.Float
                else:
                    # if the stack depth is deeper than once, pop
                    if len(stack) > 1:
                        stack.pop()
                    scanner.get_char()

elif stack[-1] == 'string':
                if scanner.scan(r"''"):
                    token = String.Escape
                elif scanner.scan(r"'"):
                    token = String
                    stack.pop()
                elif scanner.scan(r"[^']*"):
                    token = String
                else:
                    scanner.get_char()
                    stack.pop()

elif stack[-1] == 'asm':
                if scanner.scan(r'\s+'):
                    token = Text
                elif scanner.scan(r'end'):
                    token = Keyword
                    stack.pop()
                elif scanner.scan(r'\{.*?\}|$\*.*?\*$'):
                    if scanner.match.startswith('$'):
                        token = Comment.Preproc
                    else:
                        token = Comment.Multiline
                elif scanner.scan(r'//.*?$'):
                    token = Comment.Single
                elif scanner.scan(r"'"):
                    token = String
                    stack.append('string')
                elif scanner.scan(r'@@[A-Za-z_][A-Za-z_0-9]*'):
                    token = Name.Label
                elif scanner.scan(r'[A-Za-z_][A-Za-z_0-9]*'):
                    lowercase_name = scanner.match.lower()
                    if lowercase_name in self.ASM_INSTRUCTIONS:
                        token = Keyword
                    elif lowercase_name in self.ASM_REGISTERS:
                        token = Name.Builtin
                    else:
                        token = Name
                elif scanner.scan(r'[-+*\/=<>:;,.@\^]+'):
                    token = Operator
                elif scanner.scan(r'[\[\]]+'):
                    token = Punctuation
                elif scanner.scan(r'\$[0-9A-Fa-f]+'):
                    token = Number.Hex
                elif scanner.scan(r'\d+(?![eE]|\.[^.])'):
                    token = Number.Integer
                elif scanner.scan(r'\d+(\.\d+([eE][+-]?\d+)?|[eE][+-]?\d+)'):
                    token = Number.Float
                else:
                    scanner.get_char()
                    stack.pop()

# save the dot!!!11
            if scanner.match.strip():
                was_dot = scanner.match == '.'
            yield scanner.start_pos, token, scanner.match or ''

class AdaLexer(RegexLexer):
    """
    For Ada source code.

.. versionadded:: 1.3
    """

name = 'Ada'
    aliases = ['ada', 'ada95', 'ada2005']
    filenames = ['*.adb', '*.ads', '*.ada']
    mimetypes = ['text/x-ada']

flags = re.MULTILINE | re.IGNORECASE

tokens = {
        'root': [
            (r'[^\S\n]+', Text),
            (r'--.*?\n', Comment.Single),
            (r'[^\S\n]+', Text),
            (r'function|procedure|entry', Keyword.Declaration, 'subprogram'),
            (r'(subtype|type)(\s+)(\w+)',
             bygroups(Keyword.Declaration, Text, Keyword.Type), 'type_def'),
            (r'task|protected', Keyword.Declaration),
            (r'(subtype)(\s+)', bygroups(Keyword.Declaration, Text)),
            (r'(end)(\s+)', bygroups(Keyword.Reserved, Text), 'end'),
            (r'(pragma)(\s+)(\w+)', bygroups(Keyword.Reserved, Text,
                                             Comment.Preproc)),
            (r'(true|false|null)\b', Keyword.Constant),
            (words((
                'Address', 'Byte', 'Boolean', 'Character', 'Controlled', 'Count',
                'Cursor', 'Duration', 'File_Mode', 'File_Type', 'Float', 'Generator',
                'Integer', 'Long_Float', 'Long_Integer', 'Long_Long_Float',
                'Long_Long_Integer', 'Natural', 'Positive', 'Reference_Type',
                'Short_Float', 'Short_Integer', 'Short_Short_Float',
                'Short_Short_Integer', 'String', 'Wide_Character', 'Wide_String'),
                   suffix=r'\b'),
             Keyword.Type),
            (r'(and(\s+then)?|in|mod|not|or(\s+else)|rem)\b', Operator.Word),
            (r'generic|private', Keyword.Declaration),
            (r'package', Keyword.Declaration, 'package'),
            (r'array\b', Keyword.Reserved, 'array_def'),
            (r'(with|use)(\s+)', bygroups(Keyword.Namespace, Text), 'import'),
            (r'(\w+)(\s*)(:)(\s*)(constant)',
             bygroups(Name.Constant, Text, Punctuation, Text,
                      Keyword.Reserved)),
            (r'<<\w+>>', Name.Label),
            (r'(\w+)(\s*)(:)(\s*)(declare|begin|loop|for|while)',
             bygroups(Name.Label, Text, Punctuation, Text, Keyword.Reserved)),
            (words((
                'abort', 'abs', 'abstract', 'accept', 'access', 'aliased', 'all',
                'array', 'at', 'begin', 'body', 'case', 'constant', 'declare',
                'delay', 'delta', 'digits', 'do', 'else', 'elsif', 'end', 'entry',
                'exception', 'exit', 'interface', 'for', 'goto', 'if', 'is', 'limited',
                'loop', 'new', 'null', 'of', 'or', 'others', 'out', 'overriding',
                'pragma', 'protected', 'raise', 'range', 'record', 'renames', 'requeue',
                'return', 'reverse', 'select', 'separate', 'some', 'subtype',
                'synchronized', 'task', 'tagged', 'terminate', 'then', 'type', 'until',
                'when', 'while', 'xor'), prefix=r'\b', suffix=r'\b'),
             Keyword.Reserved),
            (r'"[^"]*"', String),
            include('attribute'),
            include('numbers'),
            (r"'[^']'", String.Character),
            (r'(\w+)(\s*|[(,])', bygroups(Name, using(this))),
            (r"(<>|=>|:=|[()|:;,.'])", Punctuation),
            (r'[*<>+=/&-]', Operator),
            (r'\n+', Text),
        ],
        'numbers': [
            (r'[0-9_]+#[0-9a-f_\.]+#', Number.Hex),
            (r'[0-9_]+\.[0-9_]*', Number.Float),
            (r'[0-9_]+', Number.Integer),
        ],
        'attribute': [
            (r"(')(\w+)", bygroups(Punctuation, Name.Attribute)),
        ],
        'subprogram': [
            (r'\(', Punctuation, ('#pop', 'formal_part')),
            (r';', Punctuation, '#pop'),
            (r'is\b', Keyword.Reserved, '#pop'),
            (r'"[^"]+"|\w+', Name.Function),
            include('root'),
        ],
        'end': [
            ('(if|case|record|loop|select)', Keyword.Reserved),
            (r'"[^"]+"|[\w.]+', Name.Function),
            (r'\s+', Text),
            (';', Punctuation, '#pop'),
        ],
        'type_def': [
            (r';', Punctuation, '#pop'),
            (r'$', Punctuation, 'formal_part'),
            (r'with|and|use', Keyword.Reserved),
            (r'array\b', Keyword.Reserved, ('#pop', 'array_def')),
            (r'record\b', Keyword.Reserved, ('record_def')),
            (r'(null record)(;)', bygroups(Keyword.Reserved, Punctuation), '#pop'),
            include('root'),
        ],
        'array_def': [
            (r';', Punctuation, '#pop'),
            (r'(\w+)(\s+)(range)', bygroups(Keyword.Type, Text, Keyword.Reserved)),
            include('root'),
        ],
        'record_def': [
            (r'end record', Keyword.Reserved, '#pop'),
            include('root'),
        ],
        'import': [
            (r'[\w.]+', Name.Namespace, '#pop'),
            default('#pop'),
        ],
        'formal_part': [
            (r'$', Punctuation, '#pop'),
            (r'\w+', Name.Variable),
            (r',|:[^=]', Punctuation),
            (r'(in|not|null|out|access)\b', Keyword.Reserved),
            include('root'),
        ],
        'package': [
            ('body', Keyword.Declaration),
            (r'is\s+new|renames', Keyword.Reserved),
            ('is', Keyword.Reserved, '#pop'),
            (';', Punctuation, '#pop'),
            (r'$', Punctuation, 'package_instantiation'),
            (r'([\w.]+)', Name.Class),
            include('root'),
        ],
        'package_instantiation': [
            (r'("[^"]+"|\w+)(\s+)(=>)', bygroups(Name.Variable, Text, Punctuation)),
            (r'[\w.\'"]', Text),
            (r'$', Punctuation, '#pop'),
            include('root'),
        ],
    }

Urban Research Lab

The Urban Research Lab (URL) at IIIT-Delhi was established in 2020, during a time when the pandemic brought the complexities of urban life more visible than ever. What started as an initiative by faculty and students has grown into a collaborative space for critically exploring and reimagining the urban questions through research, dialogue, and interdisciplinary engagement.

${this.title}

Code Editor : pascal.py

Urban Research Lab