Creating a multi-line string of JavaScript within a Perl script

I am currently working on creating a unique JavaScript string using q{} like this:

    my $javascript = q{
        $(function () {
            var chart;

            $(document).ready(function () {

                // Build the chart
                $(\'#container\').highcharts({
                    chart: {
                        plotBackgroundColor: null,
                        plotBorderWidth: null,
                        plotShadow: false
                    },
                    title: {
                        text: \'title\'
                    },
    };

The challenge lies in structuring it into segments rather than complete JavaScript blocks. The issue I face is that since the block is not complete, it contains open brackets '{' without closing brackets, causing Perl to interpret the closing bracket for q{} as the end of one of the JavaScript blocks. I attempted using q() instead, but encountered the same problem. Is there an alternative delimiter other than ( or { that I can use? I also experimented with qq, but faced similar issues and additional escaping requirements. While I understand that I can achieve this without using q or qq by writing individual lines, the cleaner format is preferable. I am determined to find a solution and believe there must be a way to make this work. Thank you!

javascriptperlescaping

Answer №1

When using single quotes in literals, make sure to escape \ and the delimiters { and }.

q{abc\{def\\ghi'jkl}  # This will output: abc{def\ghi'jkl

An exception is when you don't need to escape \ if it's unambiguous.

q{abc\\def}    # This will output: abc\def
q{abc\def}     # This will also output: abc\def

q{abc\\\\def}  # This will output: abc\\def
q{abc\\\def}   # This will also output: abc\\def

Another exception is when you don't need the delimiters {} if they are balanced in the literal.

q{ foo \{ bar \{ baz \} qux \} moo }   # This will output:  foo { bar { baz } qux } moo 
q{ foo \{ bar { baz } qux \} moo }     # Same as above
q{ foo { bar { baz } qux } moo }       # Same as above

If you face issues with escaping delimiters, consider using a delimiter that does not appear in the text.

my $javascript = q~
    $(function () {
        var chart;

        $(document).ready(function () {

            // Build the chart
            $('#container').highcharts({
                chart: {
                    plotBackgroundColor: null,
                    plotBorderWidth: null,
                    plotShadow: false
                },
                title: {
                    text: 'title'
                },
~;

Alternatively, you can use a single-quoted heredoc to avoid any unnecessary escapes.

my $javascript = <<'__EOJS__';
    $(function () {
        var chart;

        $(document).ready(function () {

            // Build the chart
            $('#container').highcharts({
                chart: {
                    plotBackgroundColor: null,
                    plotBorderWidth: null,
                    plotShadow: false
                },
                title: {
                    text: 'title'
                },
__EOJS__

Answer №2

Try using a different separator such as q~ ~

    my $javascript = q~
        $(function () {
            var chart;

            $(document).ready(function () {

                // Build the chart
                $('#container').highcharts({
                    chart: {
                        plotBackgroundColor: null,
                        plotBorderWidth: null,
                        plotShadow: false
                    },
                    title: {
                        text: 'title'
                    },
    ~;

Alternatively, you can utilize a heredoc:

    my $javascript = <<'END_JS';
        $(function () {
            var chart;

            $(document).ready(function () {

                // Build the chart
                $('#container').highcharts({
                    chart: {
                        plotBackgroundColor: null,
                        plotBorderWidth: null,
                        plotShadow: false
                    },
                    title: {
                        text: 'title'
                    },
END_JS

Note: I have replaced all instances of \' with ' in the provided code to improve readability.

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