"""
    pygments.lexers.ecl
    ~~~~~~~~~~~~~~~~~~~

    Lexers for the ECL language.

    :copyright: Copyright 2006-2021 by the Pygments team, see AUTHORS.
    :license: BSD, see LICENSE for details.
"""

import re

from pygments.lexer import RegexLexer, include, bygroups, words
from pygments.token import Text, Comment, Operator, Keyword, Name, String, \
    Number, Punctuation

__all__ = ['ECLLexer']


class ECLLexer(RegexLexer):
    """
    Lexer for the declarative big-data `ECL
    <https://hpccsystems.com/training/documentation/ecl-language-reference/html>`_
    language.

    .. versionadded:: 1.5
    """

    name = 'ECL'
    aliases = ['ecl']
    filenames = ['*.ecl']
    mimetypes = ['application/x-ecl']

    flags = re.IGNORECASE | re.MULTILINE

    tokens = {
        'root': [
            include('whitespace'),
            include('statements'),
        ],
        'whitespace': [
            (r'\s+', Text),
            (r'\/\/.*', Comment.Single),
            (r'/(\\\n)?\*(.|\n)*?\*(\\\n)?/', Comment.Multiline),
        ],
        'statements': [
            include('types'),
            include('keywords'),
            include('functions'),
            include('hash'),
            (r'"', String, 'string'),
            (r'\'', String, 'string'),
            (r'(\d+\.\d*|\.\d+|\d+)e[+-]?\d+[lu]*', Number.Float),
            (r'(\d+\.\d*|\.\d+|\d+f)f?', Number.Float),
            (r'0x[0-9a-f]+[lu]*', Number.Hex),
            (r'0[0-7]+[lu]*', Number.Oct),
            (r'\d+[lu]*', Number.Integer),
            (r'[~!%^&*+=|?:<>/-]+', Operator),
            (r'[{}()\[\],.;]', Punctuation),
            (r'[a-z_]\w*', Name),
        ],
        'hash': [
            (r'^#.*$', Comment.Preproc),
        ],
        'types': [
            (r'(RECORD|END)\D', Keyword.Declaration),
            (r'((?:ASCII|BIG_ENDIAN|BOOLEAN|DATA|DECIMAL|EBCDIC|INTEGER|PATTERN|'
             r'QSTRING|REAL|RECORD|RULE|SET OF|STRING|TOKEN|UDECIMAL|UNICODE|'
             r'UNSIGNED|VARSTRING|VARUNICODE)\d*)(\s+)',
             bygroups(Keyword.Type, Text)),
        ],
        'keywords': [
            (words((
                'APPLY', 'ASSERT', 'BUILD', 'BUILDINDEX', 'EVALUATE', 'FAIL',
                'KEYDIFF', 'KEYPATCH', 'LOADXML', 'NOTHOR', 'NOTIFY', 'OUTPUT',
                'PARALLEL', 'SEQUENTIAL', 'SOAPCALL', 'CHECKPOINT', 'DEPRECATED',
                'FAILCODE', 'FAILMESSAGE', 'FAILURE', 'GLOBAL', 'INDEPENDENT',
                'ONWARNING', 'PERSIST', 'PRIORITY', 'RECOVERY', 'STORED', 'SUCCESS',
                'WAIT', 'WHEN'), suffix=r'\b'),
             Keyword.Reserved),
            # These are classed differently, check later
            (words((
                'ALL', 'AND', 'ANY', 'AS', 'ATMOST', 'BEFORE', 'BEGINC++', 'BEST', 'BETWEEN', 'CASE',
                'CONST', 'COUNTER', 'CSV', 'DESCEND', 'ENCRYPT', 'ENDC++', 'ENDMACRO', 'EXCEPT',
                'EXCLUSIVE', 'EXPIRE', 'EXPORT', 'EXTEND', 'FALSE', 'FEW', 'FIRST', 'FLAT', 'FULL',
                'FUNCTION', 'GROUP', 'HEADER', 'HEADING', 'HOLE', 'IFBLOCK', 'IMPORT', 'IN', 'JOINED',
                'KEEP', 'KEYED', 'LAST', 'LEFT', 'LIMIT', 'LOAD', 'LOCAL', 'LOCALE', 'LOOKUP', 'MACRO',
                'MANY', 'MAXCOUNT', 'MAXLENGTH', 'MIN SKEW', 'MODULE', 'INTERFACE', 'NAMED', 'NOCASE',
                'NOROOT', 'NOSCAN', 'NOSORT', 'NOT', 'OF', 'ONLY', 'OPT', 'OR', 'OUTER', 'OVERWRITE',
                'PACKED', 'PARTITION', 'PENALTY', 'PHYSICALLENGTH', 'PIPE', 'QUOTE', 'RELATIONSHIP',
                'REPEAT', 'RETURN', 'RIGHT', 'SCAN', 'SELF', 'SEPARATOR', 'SERVICE', 'SHARED', 'SKEW',
                'SKIP', 'SQL', 'STORE', 'TERMINATOR', 'THOR', 'THRESHOLD', 'TOKEN', 'TRANSFORM', 'TRIM',
                'TRUE', 'TYPE', 'UNICODEORDER', 'UNSORTED', 'VALIDATE', 'VIRTUAL', 'WHOLE', 'WILD',
                'WITHIN', 'XML', 'XPATH', '__COMPRESSED__'), suffix=r'\b'),
             Keyword.Reserved),
        ],
        'functions': [
            (words((
                'ABS', 'ACOS', 'ALLNODES', 'ASCII', 'ASIN', 'ASSTRING', 'ATAN', 'ATAN2', 'AVE', 'CASE',
                'CHOOSE', 'CHOOSEN', 'CHOOSESETS', 'CLUSTERSIZE', 'COMBINE', 'CORRELATION', 'COS',
                'COSH', 'COUNT', 'COVARIANCE', 'CRON', 'DATASET', 'DEDUP', 'DEFINE', 'DENORMALIZE',
                'DISTRIBUTE', 'DISTRIBUTED', 'DISTRIBUTION', 'EBCDIC', 'ENTH', 'ERROR', 'EVALUATE',
                'EVENT', 'EVENTEXTRA', 'EVENTNAME', 'EXISTS', 'EXP', 'FAILCODE', 'FAILMESSAGE',
                'FETCH', 'FROMUNICODE', 'GETISVALID', 'GLOBAL', 'GRAPH', 'GROUP', 'HASH', 'HASH32',
                'HASH64', 'HASHCRC', 'HASHMD5', 'HAVING', 'IF', 'INDEX', 'INTFORMAT', 'ISVALID',
                'ITERATE', 'JOIN', 'KEYUNICODE', 'LENGTH', 'LIBRARY', 'LIMIT', 'LN', 'LOCAL', 'LOG', 'LOOP',
                'MAP', 'MATCHED', 'MATCHLENGTH', 'MATCHPOSITION', 'MATCHTEXT', 'MATCHUNICODE',
                'MAX', 'MERGE', 'MERGEJOIN', 'MIN', 'NOLOCAL', 'NONEMPTY', 'NORMALIZE', 'PARSE', 'PIPE',
                'POWER', 'PRELOAD', 'PROCESS', 'PROJECT', 'PULL', 'RANDOM', 'RANGE', 'RANK', 'RANKED',
                'REALFORMAT', 'RECORDOF', 'REGEXFIND', 'REGEXREPLACE', 'REGROUP', 'REJECTED',
                'ROLLUP', 'ROUND', 'ROUNDUP', 'ROW', 'ROWDIFF', 'SAMPLE', 'SET', 'SIN', 'SINH', 'SIZEOF',
                'SOAPCALL', 'SORT', 'SORTED', 'SQRT', 'STEPPED', 'STORED', 'SUM', 'TABLE', 'TAN', 'TANH',
                'THISNODE', 'TOPN', 'TOUNICODE', 'TRANSFER', 'TRIM', 'TRUNCATE', 'TYPEOF', 'UNGROUP',
                'UNICODEORDER', 'VARIANCE', 'WHICH', 'WORKUNIT', 'XMLDECODE', 'XMLENCODE',
                'XMLTEXT', 'XMLUNICODE'), suffix=r'\b'),
             Name.Function),
        ],
        'string': [
            (r'"', String, '#pop'),
            (r'\'', String, '#pop'),
            (r'[^"\']+', String),
        ],
    }

    def analyse_text(text):
        """This is very difficult to guess relative to other business languages.
        -> in conjuction with BEGIN/END seems relatively rare though."""
        result = 0

        if '->' in text:
            result += 0.01
        if 'BEGIN' in text:
            result += 0.01
        if 'END' in text:
            result += 0.01

        return result
