Symbol Table: Maintain tables by variable data type

[meganindya]

Description

The Symbol Table component in src/syntax/symbol-table/symbolTable.ts maintains global, program-specific, and routine-specific variables only by variable name. You can only fetch variables by variable name. Add methods for each table to fetch variables by variable name and variable data type.

For example, say there is a global variable foo of data type number. Currently you can fetch it by getGlobalVariable('foo'). The objective is to optionally supply the type as well like getGlobalVariable('foo', 'number'), which returns the same. But, calling getGlobalVariable('foo', 'string') returns null.

Objectives

Refactor function signatures (make change in symbolTable.ts file and the symbolTable.spec.ts file):

• getGlobalVariable(variable: string, dataType?: TDataName): IVariable | null
• getProcessVariable(variable: string, program: string, dataType?: TDataName): IVariable | null
• getRoutineVariable(variable: string, routine: string, dataType?: TDataName): IVariable | null

Add unit tests for:

• getGlobalVariable with dataType field
• getProcessVariable with dataType field
• getRoutineVariable with dataType field

[S-kus]

Hello @meganindya, I would like to work on this issue.
After going through the code, the file symbolTable.spec.ts (not symbolTable.d.ts) and symbolTable.ts are currently in src/execution/, Ig it's needed to update in the description of the issue.
Could you please confirm once again that we needed to change the getGlobalVariable() function similar to addGlobalVariable() and what is getProgramVariable I am not able to find it in any files, Is it getProcessVariable? but it's already updated according to the issue.

[meganindya]

Yes, I updated the identifiers. The output variable format needs to be what the IVariable type describes. However, all three private variable tables _globalTable, _processTable, and _routineTable store variables by variable name. They need to store those variables by data types at the top level and then by variable names inside the data types namespace. This way two identically named variables with different data types can be stored.

The objective is to:

• make changes in the private variable tables to store variables by data type and then by variable names within them
• make changes to the public query functions as specified above

[S-kus]

Thanks @meganindya, I am working on it.