field-initializer-position.js

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// Test class field initializers have reasonable lineno/column values

gczeal(0);

// Use the Debugger API to introspect the line / column.

let d = new Debugger();

let g = newGlobal({newCompartment: true})

let gw = d.addDebuggee(g);

let source = `

    let A = "A";

    let B = "B";

    class C {

        // START----v

                    'field_str';

                    'field_str_with_init' = 1;

                    [A];

                    [B] = 2;

             static x;

             static y = 3;

             static [A + "static"];

             static [B + "static"] = 4;

        // END

`;

let NumInitializers = 8;

// Compute (1-based) line number of 'START' and 'END' markers.

let START = source.split('\n').findIndex(x => x.includes("START")) + 1;

let END   = source.split('\n').findIndex(x => x.includes("END")) + 1;

assertEq(END - START - 1, NumInitializers);

// Use debugger to locate internal field-initializer scripts.

g.evaluate(source);

let scripts = d.findScripts()

               .filter(script => (script.startLine >= START &&

                                  script.startLine <= END));

scripts.sort((x, y) => (x.sourceStart - y.sourceStart))

for (var i = 0; i < NumInitializers; ++i) {

    let script = scripts[i];

    let lineText = source.split('\n')[START + i];

    // Check the initializer lambda has expected line/column

    assertEq(script.startLine, START + 1 + i);

    assertEq(script.startColumn, 21);

    // Check that source length matches expectations.

    assertEq(script.startColumn + script.sourceLength + ';'.length, lineText.length + 1);