85 lines
2.6 KiB
C
85 lines
2.6 KiB
C
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/* Copyright (c) 2012-2017 The ANTLR Project. All rights reserved.
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* Use of this file is governed by the BSD 3-clause license that
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* can be found in the LICENSE.txt file in the project root.
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*/
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#pragma once
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#include "antlr4-common.h"
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namespace antlr4 {
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namespace misc {
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// Helpers to convert certain unsigned symbols (e.g. Token::EOF) to their original numeric value (e.g. -1)
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// and vice versa. This is needed mostly for intervals to keep their original order and for toString()
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// methods to print the original numeric value (e.g. for tests).
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size_t numericToSymbol(ssize_t v);
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ssize_t symbolToNumeric(size_t v);
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/// An immutable inclusive interval a..b
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class ANTLR4CPP_PUBLIC Interval {
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public:
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static const Interval INVALID;
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// Must stay signed to guarantee the correct sort order.
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ssize_t a;
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ssize_t b;
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Interval();
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explicit Interval(size_t a_, size_t b_); // For unsigned -> signed mappings.
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Interval(ssize_t a_, ssize_t b_);
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/// return number of elements between a and b inclusively. x..x is length 1.
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/// if b < a, then length is 0. 9..10 has length 2.
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size_t length() const;
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bool operator == (const Interval &other) const;
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size_t hashCode() const;
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/// <summary>
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/// Does this start completely before other? Disjoint </summary>
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bool startsBeforeDisjoint(const Interval &other) const;
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/// <summary>
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/// Does this start at or before other? Nondisjoint </summary>
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bool startsBeforeNonDisjoint(const Interval &other) const;
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/// <summary>
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/// Does this.a start after other.b? May or may not be disjoint </summary>
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bool startsAfter(const Interval &other) const;
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/// <summary>
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/// Does this start completely after other? Disjoint </summary>
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bool startsAfterDisjoint(const Interval &other) const;
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/// <summary>
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/// Does this start after other? NonDisjoint </summary>
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bool startsAfterNonDisjoint(const Interval &other) const;
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/// <summary>
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/// Are both ranges disjoint? I.e., no overlap? </summary>
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bool disjoint(const Interval &other) const;
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/// <summary>
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/// Are two intervals adjacent such as 0..41 and 42..42? </summary>
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bool adjacent(const Interval &other) const;
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bool properlyContains(const Interval &other) const;
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/// <summary>
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/// Return the interval computed from combining this and other </summary>
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Interval Union(const Interval &other) const;
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/// <summary>
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/// Return the interval in common between this and o </summary>
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Interval intersection(const Interval &other) const;
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std::string toString() const;
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private:
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};
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} // namespace atn
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} // namespace antlr4
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