edu.mit.csail.sdg.alloy4compiler.ast
Class ExprBinary

java.lang.Object
  edu.mit.csail.sdg.alloy4compiler.ast.Browsable
      edu.mit.csail.sdg.alloy4compiler.ast.Expr
          edu.mit.csail.sdg.alloy4compiler.ast.ExprBinary

public final class ExprBinary
extends Expr

Immutable; represents an expression of the form (x OP y).

Invariant: type!=EMPTY => (this.mult!=1)

Invariant: type!=EMPTY => (this.mult==2 => this.op is one of the 17 arrow operators)

Invariant: type!=EMPTY => (left.mult!=1)

Invariant: type!=EMPTY => (left.mult==2 => this.op is one of the 17 arrow operators)

Invariant: type!=EMPTY => (right.mult==1 => this.op==IN)

Invariant: type!=EMPTY => (right.mult==2 => (this.op==IN || this.op is one of the 17 arrow operators))

Nested Class Summary

static class

ExprBinary.Op This class contains all possible binary operators.

Field Summary

Expr	left The left-hand-side expression.
ExprBinary.Op	op The binary operator.
Expr	right The right-hand-side expression.

Fields inherited from class edu.mit.csail.sdg.alloy4compiler.ast.Expr

ambiguous, closingBracket, errors, mult, pos, weight

Method Summary

int	getDepth() Returns the height of the abstract syntax tree starting from this node.
java.lang.String	getHTML() Returns the description (as HTML) to show for this node.
java.util.List<? extends Browsable>	getSubnodes() Returns a list of subnodes for this node.
boolean	isSame(Expr obj) Returns true if we can determine the two expressions are equivalent; may sometimes return false.
Expr	resolve(Type p, java.util.Collection<ErrorWarning> warns) Resolves this expression if ambiguous.
Pos	span() Returns a Pos object representing the entire span of this Expr and all its subexpressions.
void	toString(java.lang.StringBuilder out, int indent) Print a textual description of it and all subnodes to a StringBuilder, with the given level of indentation.

Methods inherited from class edu.mit.csail.sdg.alloy4compiler.ast.Expr

and, any_arrow_lone, any_arrow_one, any_arrow_some, cardinality, cast2int, cast2sigint, closure, comprehensionOver, deNOP, div, domain, equal, equals, findAllFunctions, forAll, forLone, forNo, forOne, forSome, gt, gte, hashCode, hasVar, iff, iminus, implies, in, intersect, iplus, isSeq_arrow_lone, ite, join, lone_arrow_any, lone_arrow_lone, lone_arrow_one, lone_arrow_some, lone, loneOf, loneOf, lt, lte, minus, mul, mult, no, not, one_arrow_any, one_arrow_lone, one_arrow_one, one_arrow_some, one, oneOf, oneOf, or, override, plus, pos, product, range, reflexiveClosure, rem, resolve_as_formula, resolve_as_int, resolve_as_set, setOf, setOf, sha, shl, shr, some_arrow_any, some_arrow_lone, some_arrow_one, some_arrow_some, some, someOf, someOf, sumOver, toString, transpose, type, typecheck_as_formula, typecheck_as_int, typecheck_as_set

Methods inherited from class edu.mit.csail.sdg.alloy4compiler.ast.Browsable

make, make, make, make, showAsTree

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Field Detail

op

public final ExprBinary.Op op

The binary operator.

left

public final Expr left

The left-hand-side expression.

right

public final Expr right

The right-hand-side expression.

Method Detail

isSame

public boolean isSame(Expr obj)

Returns true if we can determine the two expressions are equivalent; may sometimes return false.

Overrides:

isSame in class Expr

span

public Pos span()

Returns a Pos object representing the entire span of this Expr and all its subexpressions.

Overrides:

span in class Browsable

toString

public void toString(java.lang.StringBuilder out,
                     int indent)

Print a textual description of it and all subnodes to a StringBuilder, with the given level of indentation. (If indent<0, it will be printed in one line without line break)

Specified by:

toString in class Expr

resolve

public Expr resolve(Type p,
                    java.util.Collection<ErrorWarning> warns)

Resolves this expression if ambiguous. (And if t.size()>0, it represents the set of tuples whose presence/absence is relevent to the parent expression) (Note: it's possible for t to be EMPTY, or even ambiguous!)

On success: the return value will be well-typed and unambiguous

On failure: the return value's "errors" list will be nonempty

If we detect any type warnings, we will add the type warnings to the "warnings" collection.

Specified by:

resolve in class Expr

warns - - the list that will receive any warning we generate; can be null if we wish to ignore warnings

getDepth

public int getDepth()

Returns the height of the abstract syntax tree starting from this node.

Specified by:

getDepth in class Expr

getHTML

public java.lang.String getHTML()

Returns the description (as HTML) to show for this node.

Specified by:

getHTML in class Browsable

getSubnodes

public java.util.List<? extends Browsable> getSubnodes()

Returns a list of subnodes for this node.

Specified by:

getSubnodes in class Browsable