Why the input does not match the grammar, as reported by parse in a Result.Failure.
The type member Fields is the lexer context's fields, which the lexemes carry. parse returns errors with the fields of the lexemes it was given, so positions are the lexer context's fields, e.g. error.unexpected.map(_.line), or error.last.map(_.line) at the end of the input. In a signature, write that type as MyLexer.ParserError; plain ParserError is an error over any lexemes, without their fields.
Attributes
- Companion
- object
- Source
- parser.scala
- Graph
-
- Supertypes
-
class Objecttrait Matchableclass Any
Members list
Type members
Types
The lexer context's fields, which the lexemes carry.
Value members
Concrete methods
Compares the receiver object (this) with the argument object (that) for equivalence.
Compares the receiver object (this) with the argument object (that) for equivalence.
Any implementation of this method should be an equivalence relation:
- It is reflexive: for any instance
xof typeAny,x.equals(x)should returntrue. - It is symmetric: for any instances
xandyof typeAny,x.equals(y)should returntrueif and only ify.equals(x)returnstrue. - It is transitive: for any instances
x,y, andzof typeAnyifx.equals(y)returnstrueandy.equals(z)returnstrue, thenx.equals(z)should returntrue.
If you override this method, you should verify that your implementation remains an equivalence relation. Additionally, when overriding this method it is usually necessary to override hashCode to ensure that objects which are "equal" (o1.equals(o2) returns true) hash to the same scala.Int. (o1.hashCode.equals(o2.hashCode)).
Value parameters
- that
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the object to compare against this object for equality.
Attributes
- Returns
-
trueif the receiver object is equivalent to the argument;falseotherwise. - Definition Classes
-
Any
- Source
- parser.scala
Calculates a hash code value for the object.
Calculates a hash code value for the object.
The default hashing algorithm is platform dependent.
Note that it is allowed for two objects to have identical hash codes (o1.hashCode.equals(o2.hashCode)) yet not be equal (o1.equals(o2) returns false). A degenerate implementation could always return 0. However, it is required that if two objects are equal (o1.equals(o2) returns true) that they have identical hash codes (o1.hashCode.equals(o2.hashCode)). Therefore, when overriding this method, be sure to verify that the behavior is consistent with the equals method.
Attributes
- Returns
-
the hash code value for this object.
- Definition Classes
-
Any
- Source
- parser.scala
A readable description, e.g. Unexpected PLUS "+". Expected one of: Num.
A readable description, e.g. Unexpected PLUS "+". Expected one of: Num.
Attributes
- Source
- parser.scala
Returns a string representation of the object.
Returns a string representation of the object.
The default representation is platform dependent.
Attributes
- Returns
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a string representation of the object.
- Definition Classes
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Any
- Source
- parser.scala
Abstract fields
What the grammar would have accepted at that point: token names and ParserError.EndOfInput, sorted.
What the grammar would have accepted at that point: token names and ParserError.EndOfInput, sorted.
Attributes
- Source
- parser.scala
At the end of the input, the last lexeme before it; None when the input is empty or the error is not at the end.
At the end of the input, the last lexeme before it; None when the input is empty or the error is not at the end.
Attributes
- Source
- parser.scala
The lexeme the parser could not accept; None when the input ended too early.
The lexeme the parser could not accept; None when the input ended too early.
Attributes
- Source
- parser.scala