Implement parsing measure from text through ASG#42
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jakelishman
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| // FIXME: type may not be correct here. | ||
| // This assumes a single qubit is measured. | ||
| pub fn to_texpr(self) -> TExpr { | ||
| TExpr::new(Expr::MeasureExpression(self), Type::Bit(IsConst::False)) | ||
| } |
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I think the type map should be fairly straightforwards, if the program is semantically correct:
let out_type = match self.operand.get_type() {
Type::Qubit => Ok(Type::Bit(IsConst::False)),
Type::QubitArray(dims) => Ok(Type::BitArray(dims.clone(), IsConst::False)),
_ => Err(<type error>),
}?;
Statements like `c = measure q` are analyzed correctly. But `c[0] = measure q` is not analyzed correctly. The code that builds the assignment statement assumes the LHS is an identifier. The ASG should be able to handle valid lvalues. But we cannot yet construct statements with them.
This is done twice and is several lines, so it is a function now.
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This is unrelated to measurement.
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measure from text through ASGmeasure from text through ASG
`GateOperand` is a qubit argument to gate call. And arguments to `measure` have the same spec. Identifier, hardware identifier, or indexed identifier. So we reuse the code from gate call. The code in oq3_parser is a bit mysterious. I added some comments to make it easier to locate next time, I hope.
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All of the failing examples given in #38 are included as (passing) tests. Either in this PR or in earlier PRs. Part of the fix for #38 was done in #42, which implemented measure. The other part of the fix for #38 is in the present PR, which allows indexed identifiers as lvalues in assignment. Closes #38
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Statements like
c = measure qare analyzed correctly. Butc[0] = measure qis not analyzed correctly. The code that builds the assignment statement assumes the LHS is an identifier. The ASG should be able to handle valid lvalues. But we cannot yet construct statements with them.EDIT: This will address part of issue #38. But not all
This PR is intended to allow
measureto work properly. But assignment to an indexed identifier is still broken. However, the latter is a more general issue and will be fixed in a future PR.See the tests in "Files changed" to see examples of what has been fixed.