def runTest(self):
parser = pypeg2.Parser()
r = parser.parse("hello, world", pypeg2.attr("some", pypeg2.Symbol))
self.assertEqual(
r,
(
', world',
pypeg2.attr.Class(name='some', thing=pypeg2.Symbol('hello'),
subtype=None)
)
)
class Function(List):
grammar = attr('typing',
Type), blank, name(), '(', Parameters, ')', endl, block
class DispositionParm(str):
"""A parameter for the Disposition-Type header (RFC6266, Section 4.1)."""
grammar = peg.attr('name', NoExtToken), '=', Value
class KeywordRule(LeafRule):
grammar = attr('value', re.compile(r"[\w\d]+(\.[\w\d]+)*"))
class Main(UnaryRule):
grammar = [
(omit(_), attr('op', Query), omit(_)),
attr('op', EmptyQueryRule),
]
class ImplicitAndQuery(UnaryRule):
grammar = [
attr('op', NotQuery),
attr('op', ParenthesizedQuery),
attr('op', SimpleQuery),
]
class SimpleQuery(UnaryRule):
grammar = attr('op', [KeywordQuery, ValueQuery])
re.compile(r'\b(?!\d\d\d\w{0,3}|%s)\S+\b:' %
"|".join([x + ":"
for x in SPIRES_KEYWORDS.keys()])))
class KeywordQuery(BinaryRule):
pass
class EmptyQueryRule(LeafRule):
grammar = attr('value', re.compile(r'\s*'))
KeywordQuery.grammar = [
(
attr('left', KeywordRule),
omit(_, Literal(':'), _),
# FIXME: This should be replaced with KeywordQuery to restore
# intented functionality.
# Also NestedKeywordsRule class should be removed from
# this file, ./ast.py and ./walkers/pypeg_to_ast.py.
attr('right', NestedKeywordsRule)
),
(
attr('left', KeywordRule),
omit(_, Literal(':'), _),
attr('right', Value)
),
(
attr('left', KeywordRule),
omit(_, Literal(':'), _),
class SpiresKeywordQuery(BinaryRule):
"""Keyword queries with space separator (i.e. Spires style)."""
grammar = attr('left', InspireKeyword), attr('right', Value)
class LessThanOp(UnaryRule):
"""Less than operator.
Supports queries like author-count < 100 or date before 1984.
"""
grammar = omit(re.compile(r"before|<", re.IGNORECASE)), attr('op', SimpleValue)
class GreaterThanOp(UnaryRule):
"""Greater than operator.
Supports queries like author-count > 2000 or date after 10-2000.
"""
grammar = omit(re.compile(r"after|>", re.IGNORECASE)), attr('op', SimpleValue)
class SimpleValueNegation(UnaryRule):
"""Negation accepting only SimpleValues."""
grammar = omit(Not), attr('op', SimpleValue)
class Whitespace(LeafRule):
grammar = attr('value', whitespace)
class ParenthesizedQuery(UnaryRule):
"""Parenthesized query for denoting precedence."""
grammar = omit(Literal('(')), attr('op', Statement), omit(Literal(')'))
class NestedKeywordQuery(BinaryRule):
"""Nested Keyword queries.
E.g. citedby:author:hui and refersto:author:witten
"""
pass
Expression.grammar = attr('op', [
NotQuery,
NestedKeywordQuery,
ParenthesizedQuery,
SimpleQuery,
])
NestedKeywordQuery.grammar = \
attr('left', [
# Most specific regex must be higher.
re.compile(r'citedbyexcludingselfcites', re.IGNORECASE),
re.compile(r'citedbyx', re.IGNORECASE),
re.compile(r'citedby', re.IGNORECASE),
re.compile(r'referstoexcludingselfcites', re.IGNORECASE),
re.compile(r'referstox', re.IGNORECASE),
re.compile(r'refersto', re.IGNORECASE),
]), \
optional(omit(":")), \
omit(re.compile(r"or", re.I)),
[
(omit(Whitespace), attr('op', SpiresSimpleQuery)),
(omit(_), attr('op', SpiresParenthesizedQuery)),
(omit(Whitespace), attr('op', SpiresValueQuery)),
]
)
SpiresQuery.grammar = attr('children', (
[
SpiresParenthesizedQuery,
SpiresSimpleQuery,
],
maybe_some((
omit(_),
[
SpiresNotQuery,
SpiresAndQuery,
SpiresOrQuery,
]
)),
))
class NestableKeyword(LeafRule):
grammar = attr('value', [
re.compile('refersto', re.I),
re.compile('citedby', re.I),
])
body = None
class List(MExpression):
head = MSymbol("List")
grammar = (
Literal("{"), optional(attr("body", csl(MExpression))), Literal("}")
)
# Since MExpression is recursive, we need to define the class,
# then the grammar. Moreover, since it depends on List and other
# such things, we need to put it last.
MExpression.grammar = [
(
attr("head", MSymbol), Literal("["), optional(attr("body", csl(MExpression))), Literal("]")
),
attr("head", MSymbol),
List,
atom
]
## TESTING ###########################################################
if __name__ == "__main__":
print parse("ab`c", MExpression)
print parse('12', MExpression)
print parse('"a"', MExpression)
print parse("List", MExpression)
print parse("List[]", MExpression)
class NotQuery(UnaryRule):
"""Negation query."""
grammar = omit(Not), attr('op', Expression)
class ParenthesizedQuery(UnaryRule):
"""Parenthesized query for denoting precedence."""
grammar = omit(Literal('(')), attr('op', Statement), omit(Literal(')'))
class RelativeGroupArgument(IntNumMixin):
grammar = ["group"], "=", peg.attr("num", re.compile(r"[+\-][1-4]"))
class ValueQuery(UnaryRule):
grammar = attr('op', Value)
class Query(ListRule):
pass
class KeywordQuery(BinaryRule):
pass
KeywordQuery.grammar = [
(
attr('left', KeywordRule),
omit(_, Literal(':'), _),
attr('right', KeywordQuery)
),
(
attr('left', KeywordRule),
omit(_, Literal(':'), _),
attr('right', Value)
),
(
attr('left', KeywordRule),
omit(_, Literal(':'), _),
attr('right', Query)
),
]
class ParenthesizedQuery(UnaryRule):
grammar = (
omit(Literal('('), _),
attr('op', Query),
omit(_, Literal(')')),
)
class DoubleQuotedString(LeafRule):
grammar = Literal('"'), attr('value', re.compile(r'([^"]|\\.)*')), \
Literal('"')
class EmptyQueryRule(LeafRule):
grammar = attr('value', re.compile(r'\s*'))
class SlashQuotedString(LeafRule):
grammar = Literal('/'), attr('value', re.compile(r"([^/]|\\.)*")), \
Literal('/')
class Whitespace(LeafRule):
grammar = attr('value', re.compile(r"\s+"))
class SimpleRangeValue(LeafRule):
grammar = attr('value', re.compile(r"([^\s\)\(-]|-+[^\s\)\(>])+"))
class SingleQuotedString(LeafRule):
grammar = Literal("'"), attr('value', re.compile(r"([^']|\\.)*")), \
Literal("'")
class RangeValue(UnaryRule):
grammar = attr('op', [DoubleQuotedString, SimpleRangeValue])
class Parameter:
grammar = attr('typing', Type), blank, name()
class RangeOp(BinaryRule):
grammar = (
attr('left', RangeValue),
Literal('->'),
attr('right', RangeValue)
)
class FromImport(object):
grammar = "from", blank, attr("name", Package), blank, "import", \
blank, attr("modules", Modules), endl
class NestableKeyword(LeafRule):
grammar = attr('value', [
re.compile('refersto', re.I),
re.compile('citedby', re.I),
])
AST node for a conjunction.
"""
grammar = (attr('left', Term), blank, Keyword('and'), blank,
attr('right', Expression))
class Disjunction(BinaryNode):
"""
AST node for a disjunction.
"""
grammar = (attr('left', Term), blank, Keyword('or'), blank,
attr('right', Expression))
Term.grammar = attr('expression', [Grouping,
Negation,
Clause,
Tautology])
Expression.grammar = attr('expression', [Conjunction,
Disjunction,
Term])
class Visitor(object):
"""
Decorator for visitor methods on AST nodes.
>>> class PrettyPrinter(object):
... visitor = Visitor()
...
... @visitor(Tautology)
... def visit(self, node):
class Number(LeafRule):
grammar = attr('value', re.compile(r'\d+'))
class ValueQuery(UnaryRule):
grammar = attr("op", Value)
class Query(ListRule):
pass
class KeywordQuery(BinaryRule):
pass
KeywordQuery.grammar = [
(attr("left", KeywordRule), omit(_, Literal(":"), _), attr("right", KeywordQuery)),
(attr("left", KeywordRule), omit(_, Literal(":"), _), attr("right", Value)),
(attr("left", KeywordRule), omit(_, Literal(":"), _), attr("right", Query)),
]
class SimpleQuery(UnaryRule):
grammar = attr("op", [KeywordQuery, ValueQuery])
class ParenthesizedQuery(UnaryRule):
grammar = (omit(Literal("("), _), attr("op", Query), omit(_, Literal(")")))
class NotQuery(UnaryRule):
grammar = [
class ValueQuery(UnaryRule):
grammar = attr('op', Value)
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
"""
Data Access Module
"""
from __future__ import absolute_import, print_function, division
import re
from pypeg2 import word, attr, List, maybe_some, parse as peg_parse
from datacube.model import Range
FIELD_NAME = attr(u'field_name', word)
NUMBER = re.compile(r"[-+]?(\d*\.\d+|\d+\.\d*|\d+)")
# A limited string can be used without quotation marks.
LIMITED_STRING = re.compile(r"[a-zA-Z][\w\._-]*")
# Inside string quotation marks. Kept simple. We're not supporting escapes or much else yet...
STRING_CONTENTS = re.compile(r"[\w\s\._-]*")
class Expr(object):
def query_repr(self, get_field):
"""
Return this as a database expression.
:type get_field: (str) -> datacube.index.fields.Field
:rtype: datacube.index.fields.Expression
def compose(self, parser: Any, grammar: Any = None, attr_of: str = None) -> str:
"""
Return the Condition as string format
:param parser: Parser instance
:param grammar: Grammar
:param attr_of: Attribute of...
"""
if type(self.left) is Condition:
left = "({0})".format(parser.compose(self.left, grammar=grammar, attr_of=attr_of))
else:
left = parser.compose(self.left, grammar=grammar, attr_of=attr_of)
if getattr(self, 'op', None):
if type(self.right) is Condition:
right = "({0})".format(parser.compose(self.right, grammar=grammar, attr_of=attr_of))
else:
right = parser.compose(self.right, grammar=grammar, attr_of=attr_of)
op = parser.compose(self.op, grammar=grammar, attr_of=attr_of)
result = "{0} {1} {2}".format(left, op, right)
else:
result = left
return result
Condition.grammar = contiguous(attr('left', [SIG, XHX, CSV, CLTV, ('(', Condition, ')')]),
maybe_some(whitespace, attr('op', Operator), whitespace,
attr('right', [SIG, XHX, CSV, CLTV, ('(', Condition, ')')])))
