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Rewrite the ArithmeticsEvaluator.number rule to handle well both floating-point numbers and integers

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This commit is contained in:
Iaroslav Postovalov 2021-11-29 13:24:44 +07:00
parent c6a4721d64
commit cf5f886226
1 changed files with 17 additions and 2 deletions
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19
kmath-ast/src/commonMain/kotlin/space/kscience/kmath/ast/parser.kt
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@ -22,6 +22,7 @@ import space.kscience.kmath.operations.FieldOps
import space.kscience.kmath.operations.GroupOps
import space.kscience.kmath.operations.PowerOperations
import space.kscience.kmath.operations.RingOps
import kotlin.math.floor
/**
* better-parse implementation of grammar defined in the ArithmeticsEvaluator.g4.
@ -40,9 +41,22 @@ public object ArithmeticsEvaluator : Grammar<MST>() {
private val div: Token by literalToken("/")
private val minus: Token by literalToken("-")
private val plus: Token by literalToken("+")
@Suppress("unused")
private val ws: Token by regexToken("\\s+".toRegex(), ignore = true)
private val number: Parser<MST> by num use { MST.Numeric(text.toDouble()) }
// TODO Rewrite as custom parser to handle numbers with better precision. Currently, numbers like 1e10 are handled while they could be stored as longs without precision loss.
private val number: Parser<MST> by num use {
val d = text.toDoubleOrNull()
MST.Numeric(
if (d == null || d == floor(d) && !d.isInfinite()) {
text.toLongOrNull() ?: text.toDouble()
} else
d
)
}
private val singular: Parser<MST> by id use { Symbol(text) }
private val unaryFunction: Parser<MST> by (id and -lpar and parser(ArithmeticsEvaluator::subSumChain) and -rpar)
@ -91,7 +105,8 @@ public object ArithmeticsEvaluator : Grammar<MST>() {
}
/**
* Tries to parse the string into [MST] using [ArithmeticsEvaluator]. Returns [ParseResult] representing expression or error.
* Tries to parse the string into [MST] using [ArithmeticsEvaluator]. Returns [ParseResult] representing expression or
* error.
*
* @receiver the string to parse.
* @return the [MST] node.