columnNumber.js - mozsearch

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// Simple tests for evaluate's "columnNumber" option.

load(libdir + 'asserts.js');

assertEq(evaluate("saveStack().column"), 1);

assertEq(evaluate("saveStack().column", { columnNumber: 1729 }), 1729);

assertEq(evaluate("\nsaveStack().column", { columnNumber: 1729 }), 1);

assertEq(evaluate("saveStack().column", { columnNumber: "42" }), 42);

// columnNumber < 1 is fixed to 1.

assertEq(evaluate("saveStack().column", { columnNumber: -10 }), 1);

assertThrowsInstanceOf(() => evaluate("saveStack().column", { columnNumber: Math.pow(2,30) }),

                       RangeError);

if (helperThreadCount() > 0) {

  print("offThreadCompileToStencil 1");

  offThreadCompileToStencil("saveStack().column", { columnNumber: -10 });

  var stencil = finishOffThreadStencil();

  assertEq(evalStencil(stencil), 1);

  print("offThreadCompileToStencil 2");

  offThreadCompileToStencil("saveStack().column", { columnNumber: Math.pow(2,30) });

  assertThrowsInstanceOf(() => {

    var stencil = finishOffThreadStencil();

    evalStencil();

  }, RangeError);

  print("offThreadCompileToStencil 3");

  offThreadCompileToStencil("saveStack().column", { columnNumber: 10000 });

  stencil = finishOffThreadStencil();

  assertEq(evalStencil(stencil), 10000);

// Check handling of columns near the limit of our ability to represent them.

// (This is hardly thorough, but since web content can't set column numbers,

// it's probably not worth it to be thorough.)

const maxColumn = Math.pow(2, 30) - 2;

assertEq(evaluate("saveStack().column", { columnNumber: maxColumn }),

         maxColumn);

// Check the saturation behavior when we reach the limit of the column

// representation.

assertEq(evaluate(" saveStack().column", { columnNumber: maxColumn }),

         maxColumn + 1);

// Gathering source text for inclusion in error messages should not try to reach

// outside the buffer to find the start of the source line. The below should

// report the error without crashing.

assertThrowsInstanceOf(() => evaluate("function x(y,y) { 'use strict'; } x()",

                                      { columnNumber: 10 }),

                       SyntaxError);