xval — Syntax Highlighting for xact

Syntax highlighting for the xact language (.xact, .xval files) — Xval's mathematical modeling language that mirrors computation logic in xlsx format.

Features

• Full syntax highlighting for xact scripts
• Keywords: table, vtable, input, source, nrows, columns, type, distinct, vtables, params, name
• Built-in functions: $sum, $year, $lookup, $if, $floor, $date, and all other $-prefixed functions
• Type annotations: <int>, <float>, <string>, <date>, <bool>, including date informats like <date "%Y-%m-%d">
• Table references: extract.POLNUM, summary.projection.age — table names are highlighted distinctly from column names
• Quoted column names: extract."ISSUE AGE" and named identifiers like 'Is Qualified'n
• Row indices: t, t0, t1, etc.
• Constants: True, False, integers, and floats
• Comments: line (//) and block (/* */)
• Bracket matching and auto-closing for {}, [], (), and quote pairs

Installation

1. Copy the xval folder into your VS Code extensions directory:
   • Windows: %USERPROFILE%\.vscode\extensions\
   • macOS/Linux: ~/.vscode/extensions/
2. Restart VS Code.
3. Open any .xact or .xval file to see syntax highlighting.

Example

input extract {
    type: "csv";
    columns: {
        POLNUM <string>;
        ISSUE_DATE <date "%Y-%m-%d">;
        'ISSUE AGE'n <int>;
    }
}

table policy_metadata {
    nrows: extract;
    columns: {
        issue_year <int>: $year(extract.ISSUE_DATE[t]);
        issue_month <int>: $month(extract.ISSUE_DATE[t]);
    }
}

vtable projection {
    nrows: 24; // years
    columns: {
        age <int>: extract."ISSUE AGE"[t1] + t;
        annual_mort <float>: $lookup(
            mortality.PROBABILITY[:],
            mortality.AGE[:] == self.age[t]
        );
    }
}

File Associations