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// Copyright 2020 Google LLC
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// https://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// 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.
//
include "flatbuffers.fbs";
namespace libtextclassifier3.grammar.SemanticExpression_;
union Expression {
ConstValueExpression,
ConstituentExpression,
ComposeExpression,
SpanAsStringExpression,
ParseNumberExpression,
MergeValueExpression,
ArithmeticExpression,
}
// A semantic expression.
namespace libtextclassifier3.grammar;
table SemanticExpression {
expression:SemanticExpression_.Expression;
}
// A constant flatbuffer value.
namespace libtextclassifier3.grammar;
table ConstValueExpression {
// The base type of the value.
base_type:int;
// The id of the type of the value.
// The id is used for lookup in the semantic values type metadata.
type:int;
// The serialized value.
value:[ubyte];
}
// The value of a rule constituent.
namespace libtextclassifier3.grammar;
table ConstituentExpression {
// The id of the constituent.
id:ushort;
}
// The fields to set.
namespace libtextclassifier3.grammar.ComposeExpression_;
table Field {
// The field to set.
path:libtextclassifier3.FlatbufferFieldPath;
// The value.
value:SemanticExpression;
}
// A combination: Compose a result from arguments.
// https://mitpress.mit.edu/sites/default/files/sicp/full-text/book/book-Z-H-4.html#%_toc_%_sec_1.1.1
namespace libtextclassifier3.grammar;
table ComposeExpression {
// The id of the type of the result.
type:int;
fields:[ComposeExpression_.Field];
}
// Lifts a span as a value.
namespace libtextclassifier3.grammar;
table SpanAsStringExpression {
}
// Parses a string as a number.
namespace libtextclassifier3.grammar;
table ParseNumberExpression {
// The base type of the value.
base_type:int;
value:SemanticExpression;
}
// Merge the semantic expressions.
namespace libtextclassifier3.grammar;
table MergeValueExpression {
// The id of the type of the result.
type:int;
values:[SemanticExpression];
}
// The operator of the arithmetic expression.
namespace libtextclassifier3.grammar.ArithmeticExpression_;
enum Operator : int {
NO_OP = 0,
OP_ADD = 1,
OP_MUL = 2,
OP_MAX = 3,
OP_MIN = 4,
}
// Simple arithmetic expression.
namespace libtextclassifier3.grammar;
table ArithmeticExpression {
// The base type of the operation.
base_type:int;
op:ArithmeticExpression_.Operator;
values:[SemanticExpression];
}
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