/// <summary>Indicates whether all characters in another character class are also in this class.</summary>
/// <param name="other">The other character class.</param>
/// <returns><c>true</c> if <paramref name="other"/> is a subset of this class, otherwise <c>false.</c></returns>
public override bool Contains(InstructAST other)
{
CategoryAST oCat = other as CategoryAST;
if (oCat != null)
return this.Category == oCat.Category;
return base.Contains(other);
}
/// <summary>Indicates whether all characters in another character class are also in this class.</summary>
/// <param name="other">The other character class.</param>
/// <returns><c>true</c> if <paramref name="other"/> is a subset of this class, otherwise <c>false.</c></returns>
public override bool Contains(InstructAST other)
{
ScriptAST oScr = other as ScriptAST;
if (oScr != null)
return (this.IsExtended || !oScr.IsExtended) && this.Script == oScr.Script;
return base.Contains(other);
}
/// <summary>Indicates whether all characters in another character class are also in this class.</summary>
/// <param name="other">The other character class.</param>
/// <returns><c>true</c> if <paramref name="other"/> is a subset of this class, otherwise <c>false.</c></returns>
public override bool Contains(InstructAST other)
{
PropertyAST oProp = other as PropertyAST;
if (oProp != null)
return this.Property.Contains(oProp.Property);
CategoryAST oCat = other as CategoryAST;
if (oCat != null)
return this.Property.Contains(oCat.Category);
return base.Contains(other);
}
/// <summary>Indicates whether all positions matched by another instruction
/// are also matched by this instruction.</summary>
/// <param name="other">The other instruction.</param>
/// <returns><c>true</c> if <paramref name="other"/> is a subset of this instruction,
/// otherwise <c>false.</c></returns>
public virtual bool Contains(InstructAST other)
{
OneCharAST oChar = other as OneCharAST;
if (oChar != null && !oChar.FoldsCase)
return Contains(oChar.Character);
AndTestAST oAnd = other as AndTestAST;
if (oAnd != null)
return Contains(oAnd.Left) || Contains(oAnd.Right);
DiffTestAST oDiff = other as DiffTestAST;
if (oDiff != null)
return Contains(oDiff.Left);
return this.Equals(other);
}
/// <summary>Indicates whether this and another character class have no codepoints in common.</summary>
/// <param name="other">The other character class.</param>
/// <returns><c>true</c> if this character class and <paramref name="other"/> are disjoint,
/// otherwise <c>false</c>.</returns>
public override bool DisjointWith(InstructAST other)
{
return false;
}
internal static InstructAST Build(InstructAST left, InstructAST right)
{
// a && a == a
if (left.Equals(right)) return left;
// <empty> && a == a && <empty> == a if zero-width, <fail> otherwise
if (left == EmptyAST.Instance)
return right.IsZeroWidth ? right : AnyCharAST.Negate;
if (right == EmptyAST.Instance)
return left.IsZeroWidth ? left : AnyCharAST.Negate;
// When a contains b, a && b == b
if (left.Contains(right)) return right;
// When b contains a, a && b == a
if (right.Contains(left)) return left;
// When a and b are disjoint, a && b matches nowhere
if (left.DisjointWith(right)) return AnyCharAST.Negate;
// !a && !b == !(a || b), !a && b == b -- a, a && !b == a -- b
NotTestAST negLeft = left as NotTestAST;
NotTestAST negRight = right as NotTestAST;
if (negLeft != null)
{
if (negRight != null)
return NotTestAST.Make(OrTestAST.Make(negLeft.Argument, negRight.Argument));
else
return DiffTestAST.Make(right, negLeft.Argument);
}
else if (negRight != null)
return DiffTestAST.Make(left, negRight.Argument);
// (a && b) && c == a && (b && c)
AndTestAST andRight = right as AndTestAST;
if (andRight != null)
return AndTestAST.Make(AndTestAST.Make(left, andRight.Left), andRight.Right);
// (a || b) && c == (a && c) || (b && c)
OrTestAST orLeft = left as OrTestAST;
if (orLeft != null)
return OrTestAST.Make(AndTestAST.Make(orLeft.Left, right), AndTestAST.Make(orLeft.Right, right));
// a && (b || c) == (a && b) || (a && c)
if (!left.IsZeroWidth)
{
OrTestAST orRight = right as OrTestAST;
if (orRight != null)
return OrTestAST.Make(AndTestAST.Make(left, orRight.Left), AndTestAST.Make(left, orRight.Right));
}
// Intersection of overlapping ranges is the overlap
CharRangeAST leftRange = left as CharRangeAST;
CharRangeAST rightRange = right as CharRangeAST;
if (leftRange != null && rightRange != null && (leftRange.FoldsCase == rightRange.FoldsCase))
{
int low = Math.Max(leftRange.Min, rightRange.Min);
int high = Math.Min(leftRange.Max, rightRange.Max);
return CharRangeAST.Make(low, high, leftRange.FoldsCase);
}
return new AndTestAST(left, right);
}
/// <summary>Indicates whether all positions matched by another instruction
/// are also matched by this instruction.</summary>
/// <param name="other">The other instruction.</param>
/// <returns><c>true</c> if <paramref name="other"/> is a subset of this instruction,
/// otherwise <c>false.</c></returns>
public override bool Contains(InstructAST other)
{
return Left.Contains(other) && Right.Contains(other);
}
/// <summary>Indicates whether this and another character class have no codepoints in common.</summary>
/// <param name="other">The other character class.</param>
/// <returns><c>true</c> if this character class and <paramref name="other"/> are disjoint,
/// otherwise <c>false</c>.</returns>
public override bool DisjointWith(InstructAST other)
{
PropertyAST oProp = other as PropertyAST;
if (oProp != null)
return oProp.Property.DisjointWith(this.Category);
CategoryAST oCat = other as CategoryAST;
if (oCat != null)
return this.Category != oCat.Category;
return base.DisjointWith(other);
}
internal static InstructAST Build(InstructAST left, InstructAST right)
{
// a || <empty> == <empty> || a == a
if (EmptyAST.Instance == left) return right;
if (EmptyAST.Instance == right) return left;
// a || a == a
if (left.Equals(right)) return left;
// When a contains b, a || b == a
if (left.Contains(right)) return left;
// When b contains a, a || b == b
if (right.Contains(left)) return right;
// !a || !b == !(a && b), !a || b == !(a -- b), a || !b == !(b -- a)
NotTestAST negLeft = left as NotTestAST;
NotTestAST negRight = right as NotTestAST;
if (negLeft != null)
{
if (negRight != null)
return NotTestAST.Make(AndTestAST.Make(negLeft.Argument, negRight.Argument));
else
return NotTestAST.Make(DiffTestAST.Make(negLeft.Argument, right));
}
else if (negRight != null)
return NotTestAST.Make(DiffTestAST.Make(negRight.Argument, left));
// (a || b) || c == a || (b || c)
OrTestAST orRight = right as OrTestAST;
if (orRight != null)
return OrTestAST.Make(OrTestAST.Make(left, orRight.Left), orRight.Right);
// Merge overlapping and adjacent ranges
OneCharAST oChar = null;
CharRangeAST range = null;
CharRangeAST leftRange = left as CharRangeAST;
CharRangeAST rightRange = right as CharRangeAST;
if (leftRange != null)
{
if (rightRange != null && (leftRange.FoldsCase == rightRange.FoldsCase) &&
rightRange.Max + 1 >= leftRange.Min && leftRange.Max + 1 >= rightRange.Min)
{
int low = Math.Min(leftRange.Min, rightRange.Min);
int high = Math.Max(leftRange.Max, rightRange.Max);
return CharRangeAST.Make(low, high, leftRange.FoldsCase);
}
oChar = right as OneCharAST;
range = leftRange;
}
else if (rightRange != null)
{
oChar = left as OneCharAST;
range = rightRange;
}
// Merge a character adjacent to a range with the range
if (oChar != null)
{
if (range.FoldsCase && oChar.FoldsCase)
{
if (oChar.Character.ToCaseFold() == range.Min.ToCaseFold() - 1)
return CharRangeAST.Make(range.Min - 1, range.Max, true);
else if (oChar.Character.ToCaseFold() == range.Max.ToCaseFold() + 1)
return CharRangeAST.Make(range.Min, range.Max + 1, true);
}
if (!range.FoldsCase && !oChar.FoldsCase)
{
if (oChar.Character == range.Min - 1)
return CharRangeAST.Make(range.Min - 1, range.Max, false);
else if (oChar.Character == range.Max + 1)
return CharRangeAST.Make(range.Min, range.Max + 1, false);
}
}
return new OrTestAST(left, right);
}
/// <summary>Adds an instruction to the NFA's table.</summary>
/// <param name="ast">An AST to translate to an instruction.</param>
/// <returns>The translation of <paramref name="ast"/>.</returns>
internal int AddInstructions(InstructAST ast)
{
return instructIndex(ast);
}
/// <summary>Indicates whether this and another character class have no codepoints in common.</summary>
/// <param name="other">The other character class.</param>
/// <returns><c>true</c> if this character class and <paramref name="other"/> are disjoint,
/// otherwise <c>false</c>.</returns>
public override bool DisjointWith(InstructAST other)
{
if (!FoldsCase)
{
CharRangeAST oRange = other as CharRangeAST;
if (oRange != null && !oRange.FoldsCase)
return this.Max < oRange.Min || this.Min > oRange.Max;
for (int i = Min; i <= Max; i++)
if (other.Contains(i)) return false;
return true;
}
return base.DisjointWith(other);
}
/// <summary>Indicates whether all characters in another character class are also in this class.</summary>
/// <param name="other">The other character class.</param>
/// <returns><c>true</c> if <paramref name="other"/> is a subset of this class, otherwise <c>false.</c></returns>
public override bool Contains(InstructAST other)
{
OneCharAST oChar = other as OneCharAST;
if (oChar != null)
return (this.FoldsCase || !oChar.FoldsCase) && Contains(oChar.Character);
CharRangeAST oRange = other as CharRangeAST;
if (oRange != null) return (this.FoldsCase || !oRange.FoldsCase) &&
this.Min <= oRange.Min && oRange.Max <= this.Max;
return base.Contains(other);
}
/// <summary>Indicates whether all characters in another character class are also in this class.</summary>
/// <param name="other">The other character class.</param>
/// <returns><c>true</c> if <paramref name="other"/> is a subset of this class, otherwise <c>false.</c></returns>
public override bool Contains(InstructAST other)
{
OneCharAST oChar = other as OneCharAST;
if (oChar != null)
return (FoldsCase || !oChar.FoldsCase) && Contains(oChar.Character);
return base.Contains(other);
}
/// <summary>Indicates whether this and another character class have no codepoints in common.</summary>
/// <param name="other">The other character class.</param>
/// <returns><c>true</c> if this character class and <paramref name="other"/> are disjoint,
/// otherwise <c>false</c>.</returns>
public override bool DisjointWith(InstructAST other)
{
if (!FoldsCase && !other.IsZeroWidth)
return !other.Contains(Character);
OneCharAST oChar = other as OneCharAST;
if (oChar != null)
return !(Contains(oChar.Character) || oChar.Contains(Character));
return base.DisjointWith(other);
}
/// <summary>Indicates whether this and another character class have no codepoints in common.</summary>
/// <param name="other">The other character class.</param>
/// <returns><c>true</c> if this character class and <paramref name="other"/> are disjoint,
/// otherwise <c>false</c>.</returns>
public override bool DisjointWith(InstructAST other)
{
ScriptAST oScr = other as ScriptAST;
if (oScr != null)
return !this.IsExtended && !oScr.IsExtended && this.Script != oScr.Script;
return base.DisjointWith(other);
}
/// <summary>Indicates whether this and another instruction ever match at the same positions.</summary>
/// <param name="other">The other instruction.</param>
/// <returns><c>true</c> if this instruction and <paramref name="other"/> are disjoint,
/// otherwise <c>false</c>.</returns>
public virtual bool DisjointWith(InstructAST other)
{
OneCharAST oChar = other as OneCharAST;
if (oChar != null && !oChar.FoldsCase)
return !Contains(oChar.Character);
NotTestAST oNot = other as NotTestAST;
if (oNot != null)
return oNot.Argument.Contains(this);
AndTestAST oAnd = other as AndTestAST;
if (oAnd != null)
return DisjointWith(oAnd.Left) || DisjointWith(oAnd.Right);
DiffTestAST oDiff = other as DiffTestAST;
if (oDiff != null)
return DisjointWith(oDiff.Left);
return false;
}
private NotTestAST(InstructAST argument)
: base()
{
Argument = argument;
}
internal static InstructAST Build(InstructAST left, InstructAST right)
{
// a -- a == <fail>
if (left.Equals(right)) return AnyCharAST.Negate;
// When b contains a, a -- b matches no codepoints
if (right.Contains(left)) return AnyCharAST.Negate;
// When a and b are disjoint, a -- b == a
if (left.DisjointWith(right)) return left;
// \p{Any} -- a == !a
if (AnyCharAST.Instance.Equals(left)) return NotTestAST.Make(right);
// !a -- !b == b -- a; !a -- b == !(a || b); a -- !b == a && b
NotTestAST negLeft = left as NotTestAST;
NotTestAST negRight = right as NotTestAST;
if (negLeft != null)
{
if (negRight != null)
return DiffTestAST.Make(negRight.Argument, negLeft.Argument);
else
return NotTestAST.Make(OrTestAST.Make(negLeft.Argument, right));
}
else if (negRight != null)
return AndTestAST.Make(left, negRight.Argument);
// (a -- b) -- c == a -- (b || c)
DiffTestAST diffLeft = left as DiffTestAST;
if (diffLeft != null)
return DiffTestAST.Make(diffLeft.Left, OrTestAST.Make(diffLeft.Right, right));
// (a || b) -- c == (a -- c) || (b -- c)
OrTestAST orLeft = left as OrTestAST;
if (orLeft != null)
return OrTestAST.Make(DiffTestAST.Make(orLeft.Left, right), DiffTestAST.Make(orLeft.Right, right));
// When a and b are overlapping ranges, a -- b == a with a gap
CharRangeAST leftRange = left as CharRangeAST;
if (leftRange != null)
{
int excludeMin = -1;
int excludeMax = -1;
OneCharAST rightChar = right as OneCharAST;
if (rightChar != null && (leftRange.FoldsCase == rightChar.FoldsCase))
{
excludeMin = excludeMax = rightChar.Character;
}
CharRangeAST rightRange = right as CharRangeAST;
if (rightRange != null && (leftRange.FoldsCase == rightRange.FoldsCase))
{
excludeMin = rightRange.Min;
excludeMax = rightRange.Max;
}
if (leftRange.Min <= excludeMax && excludeMin <= leftRange.Max)
return OrTestAST.Make(CharRangeAST.Make(leftRange.Min, excludeMin - 1, leftRange.FoldsCase),
CharRangeAST.Make(excludeMax + 1, leftRange.Max, leftRange.FoldsCase));
}
return new DiffTestAST(left, right);
}
/// <summary>Indicates whether this and another character class have no codepoints in common.</summary>
/// <param name="other">The other character class.</param>
/// <returns><c>true</c> if this character class and <paramref name="other"/> are disjoint,
/// otherwise <c>false</c>.</returns>
public override bool DisjointWith(InstructAST other)
{
return Argument.Contains(other);
}
/// <summary>Indicates whether this and another instruction ever match at the same positions.</summary>
/// <param name="other">The other instruction.</param>
/// <returns><c>true</c> if this instruction and <paramref name="other"/> are disjoint,
/// otherwise <c>false</c>.</returns>
public override bool DisjointWith(InstructAST other)
{
return Left.DisjointWith(other) || Right.DisjointWith(other);
}
internal static InstructAST Build(InstructAST argument)
{
// !!a == a
NotTestAST negArg = argument as NotTestAST;
if (negArg != null) return negArg.Argument;
// !<empty> == <fail>
//if (argument == EmptyAST.Instance) return AnyCharAST.Negate;
return new NotTestAST(argument);
}
internal AndTestAST(InstructAST left, InstructAST right)
: base()
{
Left = left; Right = right;
}
/// <summary>Indicates whether all characters in another character class are also in this class.</summary>
/// <param name="other">The other character class.</param>
/// <returns><c>true</c> if <paramref name="other"/> is a subset of this class, otherwise <c>false.</c></returns>
public override bool Contains(InstructAST other)
{
return true;
}