ESSL shader error instrumentation

client-side.coffee

preprocess: (source) ->
    lines = []
    result = []
    filename = 'no file'
    lineno = 1
    for line in source.split('\n')
        match = line.match /#line (\d+) (.*)/
        if match
            lineno = parseInt(match[1], 10)+1
            filename = match[2]
        else
            lines.push
                source: line
                lineno: lineno
                filename: filename
            result.push line
            lineno += 1
    return [result.join('\n'), lines]

translateError: (error, lines) ->
    result = ['Shader Compile Error']
    for line, i in error.split('\n')
        match = line.match /ERROR: \d+:(\d+): (.*)/
        if match
            lineno = parseFloat(match[1])-1
            message = match[2]
            sourceline = lines[lineno]
            result.push "File \"#{sourceline.filename}\", Line #{sourceline.lineno}, #{message}"
            result.push "   #{sourceline.source}"
        else
            result.push line
    return result.join('\n')

server-side.py

esslRe = re.compile(
    '|'.join([
        "'''essl.*?'''",
        '"""essl.*?"""',
        "'essl.*?'",
        '"essl.*?"', 
    ]),
    re.M | re.DOTALL
)

def preprocess(source, name):
    def replace(match):
        text = match.group()
        quote, text = splitquote(text)
        lineno = source.count("\n", 0, match.start())
        result = []
        for i, line in enumerate(text.split('\n')):
            result.append('#line %i %s\\n%s' % (i+lineno, name, line))
        return quote + '\n'.join(result) + quote

    return esslRe.sub(replace, source)