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function reportScriptError(program, err, versionStringAdded) { // This machinery only gives trace information on Chrome

// The trace information provided by browsers other than Chrome does not include the line number

// of the user's program, only the line numbers of the GlowScript libraries. For that reason

// none of the following cross browser stack trace reporters are useful for GlowScript:

// Single-page multibrowser stack trace: https://gist.github.com/samshull/1088402

// stacktrase.js https://github.com/stacktracejs/stacktrace.js https://www.stacktracejs.com/#!/docs/stacktrace-js

// tracekit.js; https://github.com/csnover/TraceKit

var feedback = err.toString()+'\n'

var compile_error = (feedback.slice(0,7) === 'Error: ')

var prog = program.split('\n')

//for(var i=0; i<prog.length; i++) console.log(i, prog[i])

var unpack = /[ ]*at[ ]([^ ]*)[^>]*>:(\d*):(\d*)/

var traceback = []

if (err.cursor) {

//console.log('err.cursor',err.cursor)

// This is a syntax error from narcissus; extract the source

var c = err.cursor

while (c > 0 && err.source[c - 1] != '\n') c--;

traceback.push(err.source.substr(c).split("\n")[0])

//traceback.push(new Array((err.cursor - c) + 1).join(" ") + "^") // not working properly

} else {

// This is a runtime exception; extract the call stack if possible

// Strange behavior: sometimes err.stack is an array of end-of-line-terminated strings,

// and at other times it is one long string; in the latter case we have to create rawStack

// as an array of strings. Also, sometimes must access err.stack and sometimes must access

// err.__proto__.stack; Chrome seems to flip between these two schemes.

var usestack = false

try {

var a = err.stack

usestack = true

} catch (ignore) {

}

try {

var rawStack

if (usestack) {

rawStack = err.stack

if (typeof err.stack == 'string') rawStack = rawStack.split('\n')

} else {

var rawStack = err.__proto__.stack

if (typeof rawStack == 'string') rawStack = rawStack.split('\n')

else rawStack = rawStack.toString()

}

// TODO: Selection and highlighting in the dialog

var first = true

var i, m, caller, jsline, jschar

for (i=1; i<rawStack.length; i++) {

m = rawStack[i].match(unpack)

if (m === null) continue

caller = m[1]

jsline = m[2]

jschar = m[3]

if (caller.slice(0,3) == 'RS_') continue

if (caller == 'compileAndRun') break

if (caller == 'main') break

var line = prog[jsline-1]

if (window.__GSlang == 'javascript') { // Currently unable to embed line numbers in JavaScript programs

traceback.push(line)

traceback.push("")

break

}

var L = undefined

var end = undefined

for (var c=jschar; c>=0; c--) { // look for preceding "linenumber";

if (line[c] == ';') {

if (c > 0 && line[c-1] == '"') {

var end = c-1 // rightmost digit in "23";

c--

}

} else if (line[c] == '"' && end !== undefined) {

L = line.slice(c+1,end)

break

} else if (c === 0) {

jsline--

line = prog[jsline-1]

c = line.length

}

}

if (L === undefined) continue

var N = Number(L)

var line_no = N;

var line_index = N - 1;

if (isNaN(N)) break // Sometimes necessary.....

if (versionStringAdded) {

line_no--;

}

else if (!/^GlowScript/.test(window.__original.text[0])) {

line_index--;

}

if (first) traceback.push('At or near line '+line_no+': '+window.__original.text[line_index])

else traceback.push('Called from line '+line_no+': '+window.__original.text[line_index])

first = false

traceback.push("")

if (caller == '__$main') break

}

} catch (ignore) {

}

}

var out = ''

for (var i= 0; i<traceback.length; i++) out += traceback[i] + '\n'

return out;

} // end of reportScriptError