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QUESTION
I have the following code below and I am verifying matching types. For example relational operations are only being performed using Boolean types. I have gotten most of that. I understand that $$ is the result of the operation and $n would be right hand. But I am confused when I apply it to the function header, I need to make sure that the specified return type is being returned. Based on my grammar below the return type would $5 but the actual value being returned should be $$. My question am I applying it to the right part of the grammar and is my logic correct on how to validate that the function is returning the right type?
...ANSWER
Answered 2022-Mar-06 at 01:23Every grammar symbol (token or non-terminal) has an associated "semantic" value. The word "semantic" is used to indicate that these values are not syntactic; that is, they are not part of the parse. The bison/yacc parser does not compute these values for you, since it is only concerned with parsing the input. However, it does arrange for two things:
- Semantic values set by the lexical analyser are associated with the corresponding token;
- Whatever code you associate with a production (the "semantic action") is executed when that production is recognised.
It's up to you to write semantic actions which compute the semantic values for those non-terminals whose semantic values are needed in the productions which use them. You do this by *assigning to" the special symbol $$, which the parser will use as the semantic value of the non-terminal whose production has been recognised
In a semantic action, you can refer to the semantic values of the grammar symbols on the right-hand side of the production, using the special symbols $1, $2, etc. The number is the index of the symbol in the right-hand side. If that symbol is a token, its value must have been set by the lexical scanner, by being placed into yylval. If the referenced symbol is a non-terminal, the value must be set by every production for that non-terminal (whose actions must assign some value to $$.
There's a chapter in the Bison manual about Language semantics which goes into a lot more details, with examples. (It might help to read the introductory material in that manual first, if you have not already done so.)
For what it's worth, I would suggest not trying to do type-checking during the parse. You'll probably find it easier to separate concerns, by constructing a semantic tree ("AST") during the parse, and then doing separate passes over that tree to complete your analysis.
QUESTION
i want exclude 2nd and 4th Saturday along with Sunday on chart.
i am trying this code but its not working it gives an error -
...Relop semantic error: SEM0025: One of the values provided to the 'in' operator does not match the left side expression type 'timespan', consider using explicit cast
ANSWER
Answered 2022-Feb-28 at 14:19Here is an example of what it seems that you are asking for:
QUESTION
I just added a set of new tokens to my parser, and each of the new ones is reported as undeclared. The first line of tokens were included in the last working build.
...ANSWER
Answered 2022-Feb-14 at 02:38You can't use BEGIN as a token name, because token names are used as C values, and BEGIN is a macro defined by flex (you use it to switch start states).
That causes a syntax error in the enum declaration which you quote in your answer, with the result that all the enum members after BEGIN are undeclared. But the most important error message was the one referring to the syntax error in the enum declaration itself:
QUESTION
I am trying to make a c minus compiler am at the stage were i have to make an Abstract syntax tree and a symbol Table. Also to be to handle errors is there any chance i can have an error handling without the abstract syntax tree ? This is my output in terminal:
...ANSWER
Answered 2021-Nov-15 at 06:13Despite the hundreds of lines of code pasted into the question, I'm not sure that there is really enough to go on, particularly since you neither include all of the error messages you received nor do you include your header files. So this is going to be more of a guess than anything else. It's usually a good idea to try compiling your code before you write so much of it, particularly if you're going to be asked to provide a minimal reproducible example. But that's all a digression.
What I noticed in your grammar file, right at the beginning, are your includes:
QUESTION
Hello I have two daframes in R, and I would like to concatenate them. The structure of the dfs its like that:
...ANSWER
Answered 2021-Oct-19 at 21:08There are a few issues here:
- First - your example isn't reproducible because those
data.framesdo not have the same number of elements in each vector. I assume your ID vector should be of equal length to S1 and S2 - Second: it sounds like you can accomplish what you want in base R, without any special functions. You are just attempting to concatenate or "union" the 2 data.frames. R uses the command
rbindto do this.
I am making an assumption here on what your desired output is.
Here is a working example using rbind:
QUESTION
Almost every word is recognized as a identifier, and it doesnt even get to the more complex rules. For an example, 'program'is recognized as a conditition and it doesnt recognize 'integer a,b;' as a Decl_list , just the 'integer' part as a Decl.
Do you guys have any ideia why?
Im using this code for testing:
...ANSWER
Answered 2021-Oct-11 at 06:08Your grammar is a lexer grammar, meaning it produces only tokens. Learn the difference between lexer, parser and combined grammars here: https://github.com/antlr/antlr4/blob/master/doc/grammars.md
In short, remove the word lexer from your grammar and change some rules into parser rules (these start with a lower case letter):
QUESTION
I am using SQL Server on Windows 10
I run an update statement on a table of 170M records
The SQL update is been running for more than 9 hours now and apparently needs another 24 hours!!
here is my SQL
...ANSWER
Answered 2021-Jun-08 at 20:27Shall I kill this process and start over
Yes. The most pressing problem is your join predicate T.RepID = T.RepID. This means the query won't be doing what you hoped.
The join condition between the UPDATE target and #temp table is left completely uncorrelated.
The execution plan image shows that SQL Server treated it as below
QUESTION
Recently I am dealing with parsing xml using vb.net.
As I get more deeply, I understand that there are 2 types of contents of the xml files. The first type are xmls that I can convert easily into a dataset and I can easily see their content structure using VS dataset visualizer and the 2nd are xmls that contain the same nodes multiple times and I get The table (xxxxx) cannot be the child table to itself in nested relations.
For example I have the following xml that is a query execution plan from SQL Server and I get an error
The table (ScalarOperator) cannot be the child table to itself in nested relations
I want to get from the XML some specific info for example the output columns which are in the ColumnReference" node.
I have this code in which I download the xml plan in a local file and I am trying to parse it.
The error hits on the last line of code
...ANSWER
Answered 2021-May-24 at 00:38I found schema location on first line of the xml (http://schemas.microsoft.com/sqlserver/2004/07/showplan/sql2019/showplanxml.xsd) and then used the xsd.exe tool to create classes. Then used code below to parse the xml
QUESTION
Am trying to use regex to extract a string between a set of strings. But Kusto complains about the regex expression as invalid.
Am trying to replicate the expression from this link in my kusto query.
...ANSWER
Answered 2021-Mar-08 at 20:25as the error message suggests, the regular expression you're specifying as the argument to the extract_all() method is invalid.
from the documentation: https://docs.microsoft.com/en-us/azure/data-explorer/kusto/query/re2
The regular expression syntax supported by Kusto is that of the re2 library.
If you were to provide a sample input and the matching expected output, it'd be easier to provide you with a functional and efficient solution.
QUESTION
I am designing a compiler in Java. In this, I am reading the input from the text file and storing that input into the symbol table if its conditionally. Now I want to check the duplicates and then don't want to add that duplicates data into the table.
I have used Set which I know doesn't allow the duplicates and the program is not adding that duplicated data into the table but it is also printing Data Inserted which I don't. I want when duplicate data exist in the text, the program should say Data Already Exists.
Below is the code which is adding the data into table.
...ANSWER
Answered 2021-Jan-01 at 18:50Extract the adding to a submethod which performs a check if the data already exists:
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