racket-chatgpt-bootstrap/lib/racket-data.php

<?php

function rktd_package_name_ok($name)
{
    return is_string($name) && preg_match('/^[A-Za-z0-9_.+-]+$/', $name);
}

function rktd_unescape_string($s)
{
    $out = '';
    $n = strlen($s);

    for ($i = 0; $i < $n; $i++) {
        $c = $s[$i];

        if ($c !== '\\') {
            $out .= $c;
            continue;
        }

        if ($i + 1 >= $n) {
            break;
        }

        $i++;
        $e = $s[$i];

        if ($e === 'n') {
            $out .= "\n";
        } elseif ($e === 'r') {
            $out .= "\r";
        } elseif ($e === 't') {
            $out .= "\t";
        } else {
            $out .= $e;
        }
    }

    return $out;
}

function rktd_read_string($s, &$i)
{
    $n = strlen($s);

    if ($i >= $n || $s[$i] !== '"') {
        return null;
    }

    $i++;
    $out = '';

    while ($i < $n) {
        $c = $s[$i];
        $i++;

        if ($c === '"') {
            return $out;
        }

        if ($c === '\\') {
            if ($i >= $n) {
                break;
            }

            $e = $s[$i];
            $i++;

            if ($e === 'n') {
                $out .= "\n";
            } elseif ($e === 'r') {
                $out .= "\r";
            } elseif ($e === 't') {
                $out .= "\t";
            } else {
                $out .= $e;
            }
        } else {
            $out .= $c;
        }
    }

    return null;
}

function rktd_skip_space($s, &$i)
{
    $n = strlen($s);

    while ($i < $n) {
        $c = $s[$i];

        if ($c === ';') {
            while ($i < $n && $s[$i] !== "\n") {
                $i++;
            }
            continue;
        }

        if ($c === ' ' || $c === "\t" || $c === "\r" || $c === "\n") {
            $i++;
            continue;
        }

        break;
    }
}

function rktd_skip_string($s, &$i)
{
    $dummy = rktd_read_string($s, $i);
    return $dummy !== null;
}

function rktd_skip_atom($s, &$i)
{
    $n = strlen($s);

    while ($i < $n) {
        $c = $s[$i];

        if ($c === ' ' || $c === "\t" || $c === "\r" || $c === "\n" ||
            $c === '(' || $c === ')' || $c === '"' || $c === ';') {
            break;
        }

        $i++;
    }
}

function rktd_skip_expr($s, &$i)
{
    $n = strlen($s);

    rktd_skip_space($s, $i);

    if ($i >= $n) {
        return;
    }

    $c = $s[$i];

    if ($c === '"') {
        rktd_skip_string($s, $i);
        return;
    }

    if ($c === "'") {
        $i++;
        rktd_skip_expr($s, $i);
        return;
    }

    if ($c === '#') {
        if (substr($s, $i, 2) === '#(') {
            $i++;
            rktd_skip_expr($s, $i);
            return;
        }

        if (substr($s, $i, 5) === '#hash' ||
            substr($s, $i, 7) === '#hasheq' ||
            substr($s, $i, 8) === '#hasheqv') {
            while ($i < $n && $s[$i] !== '(') {
                $i++;
            }
            rktd_skip_expr($s, $i);
            return;
        }
    }

    if ($c === '(') {
        $depth = 0;

        while ($i < $n) {
            $c = $s[$i];

            if ($c === '"') {
                rktd_skip_string($s, $i);
                continue;
            }

            if ($c === ';') {
                while ($i < $n && $s[$i] !== "\n") {
                    $i++;
                }
                continue;
            }

            if ($c === '(') {
                $depth++;
                $i++;
                continue;
            }

            if ($c === ')') {
                $depth--;
                $i++;

                if ($depth <= 0) {
                    return;
                }

                continue;
            }

            $i++;
        }

        return;
    }

    rktd_skip_atom($s, $i);
}

function rktd_extract_top_level_package_names($text)
{
    $names = array();

    $i = strpos($text, '#hash');

    if ($i === false) {
        $i = strpos($text, '#hasheq');
    }

    if ($i === false) {
        $i = strpos($text, '#hasheqv');
    }

    if ($i === false) {
        return array();
    }

    $n = strlen($text);

    while ($i < $n && $text[$i] !== '(') {
        $i++;
    }

    if ($i >= $n || $text[$i] !== '(') {
        return array();
    }

    $i++;

    while ($i < $n) {
        rktd_skip_space($text, $i);

        if ($i >= $n) {
            break;
        }

        if ($text[$i] === ')') {
            break;
        }

        if ($text[$i] !== '(') {
            $i++;
            continue;
        }

        $i++;
        rktd_skip_space($text, $i);
        $name = rktd_read_string($text, $i);

        if ($name === null) {
            while ($i < $n && $text[$i] !== ')') {
                rktd_skip_expr($text, $i);
                rktd_skip_space($text, $i);
            }

            if ($i < $n && $text[$i] === ')') {
                $i++;
            }

            continue;
        }

        if (rktd_package_name_ok($name)) {
            $names[$name] = true;
        }

        rktd_skip_space($text, $i);

        if ($i < $n && $text[$i] === '.') {
            $i++;
        }

        rktd_skip_expr($text, $i);
        rktd_skip_space($text, $i);

        if ($i < $n && $text[$i] === ')') {
            $i++;
        }
    }

    $out = array_keys($names);
    sort($out, SORT_NATURAL | SORT_FLAG_CASE);

    return $out;
}

function rktd_extract_catalog_source($catalogText)
{
    $patterns = array(
        '/\\(\\s*source\\s*\\.\\s*"((?:[^"\\\\]|\\\\.)*)"\\s*\\)/s',
        '/\\(\\s*"source"\\s*\\.\\s*"((?:[^"\\\\]|\\\\.)*)"\\s*\\)/s',
    );

    foreach ($patterns as $pat) {
        if (preg_match($pat, $catalogText, $m)) {
            return rktd_unescape_string($m[1]);
        }
    }

    return null;
}