from .util import stem

import re

single_quote = '\''
double_quote = '"'
and_operator = 'AND'

class Query:
    '''
    represents a query.
    raw_terms -> the exact raw input for the query.
    terms -> list of terms/phrases, (stemming applied).
    is_boolean_query -> indicates if query requires an exact match or not.
    '''

    def __init__(self, raw_terms=[], terms=[], is_boolean_query=False):
        self.raw_terms = [t for t in raw_terms]
        self.terms = [t for t in terms]
        self.is_boolean_query = is_boolean_query

    @classmethod
    def parse_free_text_query(cls, line):
        '''
        parses a line into a query object for vector space retrieval.
        '''
        raw_terms = [t.strip().casefold() for t in line.strip().split(' ')]
        terms = [stem(t) for t in raw_terms] # stems each term in the line.
        return Query(raw_terms=raw_terms, terms=terms, is_boolean_query=False)

    @classmethod
    def parse_boolean_query(cls, line):
        '''
        parses a line into a query object for boolean retrieval.
        any invalid format in line will throw a ParseError.
        checks for:
        1. "AND" must be inbetween terms/phrases
        2. phrases must be start and end with double quotes
        3. terms should only contain one word (multiple terms should be chained with "AND")
        '''
        terms = []
        tokens = [t.strip().casefold() for t in line.split(and_operator)]

        # checks for invalid use of AND, ie: " AND <term>" or "<term> AND" or "AND"
        if not all(tokens):
            raise ParseError(f'"{and_operator}" not used properly')

        for token in tokens:
            if not token.startswith(double_quote) and not token.endswith(double_quote):
                if len(token.split(' ')) > 1:
                    raise ParseError(f'multiple terms should be in a phrase wrapped in quotes: {token}')
                terms.append(stem(token))
            elif token.startswith(double_quote) and token.endswith(double_quote):
                phrase = token[1:-1].strip()
                phrase_tokens = [stem(t) for t in phrase.split(' ')]
                stemmed_phrase = ' '.join(phrase_tokens)
                terms.append(stemmed_phrase)
            else:
                raise ParseError(f'mismatched quotes found in {token}')

        return Query(raw_terms=tokens, terms=terms, is_boolean_query=True)

    @classmethod
    def parse(cls, line):
        '''
        parses line and determines the type of query the line contains.
        if there is "AND" or double quotes in the line, 
        it indicates that the query contains a phrase / and operator.
        therefore it would mean that the query requires exact match.
        if not, then it is a free text query.
        '''
        if and_operator in line or double_quote in line:
            return cls.parse_boolean_query(line)
        else:
            return cls.parse_free_text_query(line)

                        
    def __repr__(self):
        return f'raw_terms: {self.raw_terms}\nterms: {self.terms}\nboolean_query: {self.is_boolean_query}'

class ParseError(Exception):
    '''
    raised when there is a error while parsing a query.
    '''
    pass

da95ad783ee8c18101d5d1c0f04e2363281b49d2
<mask token>


class Query:
    <mask token>

    def __init__(self, raw_terms=[], terms=[], is_boolean_query=False):
        self.raw_terms = [t for t in raw_terms]
        self.terms = [t for t in terms]
        self.is_boolean_query = is_boolean_query
    <mask token>

    @classmethod
    def parse_boolean_query(cls, line):
        """
        parses a line into a query object for boolean retrieval.
        any invalid format in line will throw a ParseError.
        checks for:
        1. "AND" must be inbetween terms/phrases
        2. phrases must be start and end with double quotes
        3. terms should only contain one word (multiple terms should be chained with "AND")
        """
        terms = []
        tokens = [t.strip().casefold() for t in line.split(and_operator)]
        if not all(tokens):
            raise ParseError(f'"{and_operator}" not used properly')
        for token in tokens:
            if not token.startswith(double_quote) and not token.endswith(
                double_quote):
                if len(token.split(' ')) > 1:
                    raise ParseError(
                        f'multiple terms should be in a phrase wrapped in quotes: {token}'
                        )
                terms.append(stem(token))
            elif token.startswith(double_quote) and token.endswith(double_quote
                ):
                phrase = token[1:-1].strip()
                phrase_tokens = [stem(t) for t in phrase.split(' ')]
                stemmed_phrase = ' '.join(phrase_tokens)
                terms.append(stemmed_phrase)
            else:
                raise ParseError(f'mismatched quotes found in {token}')
        return Query(raw_terms=tokens, terms=terms, is_boolean_query=True)
    <mask token>

    def __repr__(self):
        return f"""raw_terms: {self.raw_terms}
terms: {self.terms}
boolean_query: {self.is_boolean_query}"""


class ParseError(Exception):
    """
    raised when there is a error while parsing a query.
    """
    pass

<mask token>


class Query:
    <mask token>

    def __init__(self, raw_terms=[], terms=[], is_boolean_query=False):
        self.raw_terms = [t for t in raw_terms]
        self.terms = [t for t in terms]
        self.is_boolean_query = is_boolean_query

    @classmethod
    def parse_free_text_query(cls, line):
        """
        parses a line into a query object for vector space retrieval.
        """
        raw_terms = [t.strip().casefold() for t in line.strip().split(' ')]
        terms = [stem(t) for t in raw_terms]
        return Query(raw_terms=raw_terms, terms=terms, is_boolean_query=False)

    @classmethod
    def parse_boolean_query(cls, line):
        """
        parses a line into a query object for boolean retrieval.
        any invalid format in line will throw a ParseError.
        checks for:
        1. "AND" must be inbetween terms/phrases
        2. phrases must be start and end with double quotes
        3. terms should only contain one word (multiple terms should be chained with "AND")
        """
        terms = []
        tokens = [t.strip().casefold() for t in line.split(and_operator)]
        if not all(tokens):
            raise ParseError(f'"{and_operator}" not used properly')
        for token in tokens:
            if not token.startswith(double_quote) and not token.endswith(
                double_quote):
                if len(token.split(' ')) > 1:
                    raise ParseError(
                        f'multiple terms should be in a phrase wrapped in quotes: {token}'
                        )
                terms.append(stem(token))
            elif token.startswith(double_quote) and token.endswith(double_quote
                ):
                phrase = token[1:-1].strip()
                phrase_tokens = [stem(t) for t in phrase.split(' ')]
                stemmed_phrase = ' '.join(phrase_tokens)
                terms.append(stemmed_phrase)
            else:
                raise ParseError(f'mismatched quotes found in {token}')
        return Query(raw_terms=tokens, terms=terms, is_boolean_query=True)

    @classmethod
    def parse(cls, line):
        """
        parses line and determines the type of query the line contains.
        if there is "AND" or double quotes in the line, 
        it indicates that the query contains a phrase / and operator.
        therefore it would mean that the query requires exact match.
        if not, then it is a free text query.
        """
        if and_operator in line or double_quote in line:
            return cls.parse_boolean_query(line)
        else:
            return cls.parse_free_text_query(line)

    def __repr__(self):
        return f"""raw_terms: {self.raw_terms}
terms: {self.terms}
boolean_query: {self.is_boolean_query}"""


class ParseError(Exception):
    """
    raised when there is a error while parsing a query.
    """
    pass

<mask token>
single_quote = "'"
double_quote = '"'
and_operator = 'AND'


class Query:
    """
    represents a query.
    raw_terms -> the exact raw input for the query.
    terms -> list of terms/phrases, (stemming applied).
    is_boolean_query -> indicates if query requires an exact match or not.
    """

    def __init__(self, raw_terms=[], terms=[], is_boolean_query=False):
        self.raw_terms = [t for t in raw_terms]
        self.terms = [t for t in terms]
        self.is_boolean_query = is_boolean_query

    @classmethod
    def parse_free_text_query(cls, line):
        """
        parses a line into a query object for vector space retrieval.
        """
        raw_terms = [t.strip().casefold() for t in line.strip().split(' ')]
        terms = [stem(t) for t in raw_terms]
        return Query(raw_terms=raw_terms, terms=terms, is_boolean_query=False)

    @classmethod
    def parse_boolean_query(cls, line):
        """
        parses a line into a query object for boolean retrieval.
        any invalid format in line will throw a ParseError.
        checks for:
        1. "AND" must be inbetween terms/phrases
        2. phrases must be start and end with double quotes
        3. terms should only contain one word (multiple terms should be chained with "AND")
        """
        terms = []
        tokens = [t.strip().casefold() for t in line.split(and_operator)]
        if not all(tokens):
            raise ParseError(f'"{and_operator}" not used properly')
        for token in tokens:
            if not token.startswith(double_quote) and not token.endswith(
                double_quote):
                if len(token.split(' ')) > 1:
                    raise ParseError(
                        f'multiple terms should be in a phrase wrapped in quotes: {token}'
                        )
                terms.append(stem(token))
            elif token.startswith(double_quote) and token.endswith(double_quote
                ):
                phrase = token[1:-1].strip()
                phrase_tokens = [stem(t) for t in phrase.split(' ')]
                stemmed_phrase = ' '.join(phrase_tokens)
                terms.append(stemmed_phrase)
            else:
                raise ParseError(f'mismatched quotes found in {token}')
        return Query(raw_terms=tokens, terms=terms, is_boolean_query=True)

    @classmethod
    def parse(cls, line):
        """
        parses line and determines the type of query the line contains.
        if there is "AND" or double quotes in the line, 
        it indicates that the query contains a phrase / and operator.
        therefore it would mean that the query requires exact match.
        if not, then it is a free text query.
        """
        if and_operator in line or double_quote in line:
            return cls.parse_boolean_query(line)
        else:
            return cls.parse_free_text_query(line)

    def __repr__(self):
        return f"""raw_terms: {self.raw_terms}
terms: {self.terms}
boolean_query: {self.is_boolean_query}"""


class ParseError(Exception):
    """
    raised when there is a error while parsing a query.
    """
    pass

from .util import stem
import re
single_quote = "'"
double_quote = '"'
and_operator = 'AND'


class Query:
    """
    represents a query.
    raw_terms -> the exact raw input for the query.
    terms -> list of terms/phrases, (stemming applied).
    is_boolean_query -> indicates if query requires an exact match or not.
    """

    def __init__(self, raw_terms=[], terms=[], is_boolean_query=False):
        self.raw_terms = [t for t in raw_terms]
        self.terms = [t for t in terms]
        self.is_boolean_query = is_boolean_query

    @classmethod
    def parse_free_text_query(cls, line):
        """
        parses a line into a query object for vector space retrieval.
        """
        raw_terms = [t.strip().casefold() for t in line.strip().split(' ')]
        terms = [stem(t) for t in raw_terms]
        return Query(raw_terms=raw_terms, terms=terms, is_boolean_query=False)

    @classmethod
    def parse_boolean_query(cls, line):
        """
        parses a line into a query object for boolean retrieval.
        any invalid format in line will throw a ParseError.
        checks for:
        1. "AND" must be inbetween terms/phrases
        2. phrases must be start and end with double quotes
        3. terms should only contain one word (multiple terms should be chained with "AND")
        """
        terms = []
        tokens = [t.strip().casefold() for t in line.split(and_operator)]
        if not all(tokens):
            raise ParseError(f'"{and_operator}" not used properly')
        for token in tokens:
            if not token.startswith(double_quote) and not token.endswith(
                double_quote):
                if len(token.split(' ')) > 1:
                    raise ParseError(
                        f'multiple terms should be in a phrase wrapped in quotes: {token}'
                        )
                terms.append(stem(token))
            elif token.startswith(double_quote) and token.endswith(double_quote
                ):
                phrase = token[1:-1].strip()
                phrase_tokens = [stem(t) for t in phrase.split(' ')]
                stemmed_phrase = ' '.join(phrase_tokens)
                terms.append(stemmed_phrase)
            else:
                raise ParseError(f'mismatched quotes found in {token}')
        return Query(raw_terms=tokens, terms=terms, is_boolean_query=True)

    @classmethod
    def parse(cls, line):
        """
        parses line and determines the type of query the line contains.
        if there is "AND" or double quotes in the line, 
        it indicates that the query contains a phrase / and operator.
        therefore it would mean that the query requires exact match.
        if not, then it is a free text query.
        """
        if and_operator in line or double_quote in line:
            return cls.parse_boolean_query(line)
        else:
            return cls.parse_free_text_query(line)

    def __repr__(self):
        return f"""raw_terms: {self.raw_terms}
terms: {self.terms}
boolean_query: {self.is_boolean_query}"""


class ParseError(Exception):
    """
    raised when there is a error while parsing a query.
    """
    pass

from .util import stem

import re

single_quote = '\''
double_quote = '"'
and_operator = 'AND'

class Query:
    '''
    represents a query.
    raw_terms -> the exact raw input for the query.
    terms -> list of terms/phrases, (stemming applied).
    is_boolean_query -> indicates if query requires an exact match or not.
    '''

    def __init__(self, raw_terms=[], terms=[], is_boolean_query=False):
        self.raw_terms = [t for t in raw_terms]
        self.terms = [t for t in terms]
        self.is_boolean_query = is_boolean_query

    @classmethod
    def parse_free_text_query(cls, line):
        '''
        parses a line into a query object for vector space retrieval.
        '''
        raw_terms = [t.strip().casefold() for t in line.strip().split(' ')]
        terms = [stem(t) for t in raw_terms] # stems each term in the line.
        return Query(raw_terms=raw_terms, terms=terms, is_boolean_query=False)

    @classmethod
    def parse_boolean_query(cls, line):
        '''
        parses a line into a query object for boolean retrieval.
        any invalid format in line will throw a ParseError.
        checks for:
        1. "AND" must be inbetween terms/phrases
        2. phrases must be start and end with double quotes
        3. terms should only contain one word (multiple terms should be chained with "AND")
        '''
        terms = []
        tokens = [t.strip().casefold() for t in line.split(and_operator)]

        # checks for invalid use of AND, ie: " AND <term>" or "<term> AND" or "AND"
        if not all(tokens):
            raise ParseError(f'"{and_operator}" not used properly')

        for token in tokens:
            if not token.startswith(double_quote) and not token.endswith(double_quote):
                if len(token.split(' ')) > 1:
                    raise ParseError(f'multiple terms should be in a phrase wrapped in quotes: {token}')
                terms.append(stem(token))
            elif token.startswith(double_quote) and token.endswith(double_quote):
                phrase = token[1:-1].strip()
                phrase_tokens = [stem(t) for t in phrase.split(' ')]
                stemmed_phrase = ' '.join(phrase_tokens)
                terms.append(stemmed_phrase)
            else:
                raise ParseError(f'mismatched quotes found in {token}')

        return Query(raw_terms=tokens, terms=terms, is_boolean_query=True)

    @classmethod
    def parse(cls, line):
        '''
        parses line and determines the type of query the line contains.
        if there is "AND" or double quotes in the line, 
        it indicates that the query contains a phrase / and operator.
        therefore it would mean that the query requires exact match.
        if not, then it is a free text query.
        '''
        if and_operator in line or double_quote in line:
            return cls.parse_boolean_query(line)
        else:
            return cls.parse_free_text_query(line)

                        
    def __repr__(self):
        return f'raw_terms: {self.raw_terms}\nterms: {self.terms}\nboolean_query: {self.is_boolean_query}'

class ParseError(Exception):
    '''
    raised when there is a error while parsing a query.
    '''
    pass
