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range expressions are on integers only

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This commit is contained in:
Irmen de Jong 2021-09-06 21:52:14 +02:00
parent fd1f30f92b
commit af99173cd7
2 changed files with 32 additions and 2 deletions
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30
compiler/src/prog8/optimizer/ConstantIdentifierReplacer.kt
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@ -12,6 +12,7 @@ import prog8.compiler.IErrorReporter
import prog8.compiler.target.ICompilationTarget
// Fix up the literal value's type to match that of the vardecl
// (also check range literal operands types before they get expanded to arrays for instance)
internal class VarConstantValueTypeAdjuster(private val program: Program, private val errors: IErrorReporter) : AstWalker() {
override fun after(decl: VarDecl, parent: Node): Iterable<IAstModification> {
@ -52,6 +53,35 @@ internal class VarConstantValueTypeAdjuster(private val program: Program, privat
}
return noModifications
}
override fun after(range: RangeExpr, parent: Node): Iterable<IAstModification> {
val from = range.from.constValue(program)?.number?.toDouble()
val to = range.to.constValue(program)?.number?.toDouble()
val step = range.step.constValue(program)?.number?.toDouble()
if(from==null) {
if(!range.from.inferType(program).isInteger())
errors.err("range expression from value must be integer", range.from.position)
} else if(from-from.toInt()>0) {
errors.err("range expression from value must be integer", range.from.position)
}
if(to==null) {
if(!range.to.inferType(program).isInteger())
errors.err("range expression to value must be integer", range.to.position)
} else if(to-to.toInt()>0) {
errors.err("range expression to value must be integer", range.to.position)
}
if(step==null) {
if(!range.step.inferType(program).isInteger())
errors.err("range expression step value must be integer", range.step.position)
} else if(step-step.toInt()>0) {
errors.err("range expression step value must be integer", range.step.position)
}
return noModifications
}
}

4
docs/source/syntaxreference.rst
View File

@ -396,7 +396,7 @@ The following names are reserved, they have a special meaning::
Range expression
^^^^^^^^^^^^^^^^
A special value is the *range expression* which represents a range of numbers or characters,
A special value is the *range expression* which represents a range of integer numbers or characters,
from the starting value to (and including) the ending value::
<start> to <end> [ step <step> ]
@ -406,7 +406,7 @@ You an provide a step value if you need something else than the default incremen
in case of downto, a decrement of one). Because a step of minus one is so common you can just use
the downto variant to avoid having to specify the step as well.
If used in the place of a literal value, it expands into the actual array of values::
If used in the place of a literal value, it expands into the actual array of integer values::
byte[] array = 100 to 199 ; initialize array with [100, 101, ..., 198, 199]