PHP utility collection with hybrid and fluent APIs.

βŒˆβŒ‹ βŽ‡ branch:  hybrid7 libraries


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Overview
SHA1 Hash:57fe1833b259e5eab45e819be06a5a558f6614fb
Date: 2015-02-23 14:21:51
User: mario
Comment:Moved out to <a href=http://fossil.include-once.org/phrep/>separate repo</a>.
Tags And Properties
  • branch=trunk inherited from [da152c56bc]
  • sym-trunk inherited from [da152c56bc]
Context
2015-02-23
14:21
[57fe1833b2] Leaf: Moved out to <a href=http://fossil.include-once.org/phrep/>separate repo</a>. (user: mario, tags: trunk)
2015-02-20
15:34
[40155129df] Introduce `preserve` pragma/state to retain file/line/output between includes. Add complex macro construction code. Safeguard basic macros against absent args. Recheck valid function names in MacroExpressions. (user: mario, tags: trunk)
Changes

Deleted macro.php.

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<?php
/**
 * api: php
 * title: PHP Macro Preprocessor
 * description: Context-sensitive C-style #define/macro directive processing.
 * license: MITL
 * version: 0.1.8
 * state: beta
 * depends: php (>= 5.4.0)
 * type: rewrite
 * category: macro
 * config: { type: env list colon, name: PHP_INCLUDE_PATH, description: header search paths }
 * pack: macro.php=io/MacroProcessor.php
 *
 *
 * Preprocessor to apply C-style #define, #ifdef, #include statements. Intended
 * as build helper and complex macro injector. It's language-specific to PHP,
 * but can consume most common C header #defines.
 *
 * Source code/file transformation works in two phases:
 *
 *   1.  All #define, #include, #if* directives are expanded in a regex splitting
 *       state machine. Which joins includes, or omits conditional sections. This
 *       step is syntax-insensitive, but strips open/close tokens from injected
 *       files, and searches *.ph/.php/.inc/.h includes.
 *
 *   2.  Constants and macros are applied on the accumulated source code using
 *       a tokenized representation. This allows context-sensitive expansion of
 *       defined preprocessor constants, standard macros, and even more complex
 *       transformation callbacks - for constructs such as IFSET@(expr).
 *
 * Directives take the form `#define X Y` and must be noted leftmost in source
 * files. Following preprocessor directives are known:
 *
 *     #define CONST 1.2.3
 *     #ifdef CONST
 *     #include <filename.ph>
 *     #elif CONST < 1.0 || CONST >= 2.0
 *     #undef CONST
 *     #define MACRO(x,y) (x+y*2)
 *     #stderr Print some message
 *     #endif
 *     #pragma(output=0)
 *     #srcout inject_literal($source);
 *     #macro VA@(fn,expr...) {return "$fn([$expr])";}
 *
 * For compatibility with preprocess.py there's also support for doubly-commented
 * directives such as:
 *
 *     # #include <linux/errno.h>
 *     // #define X Y
 *
 * They're even valid with one ␣ space before the init // comment, and up to two
 * spaces ␣␣ before the actual #directive name. Which allows minimal structuring.
 *
 * Various #pragma(options=...) can control processing and substitution. For
 * example, output=0 allows to suppress #included file source code. Or use the
 * crude interpolate=regex mode for constant replacements, disable macros=0 etc.
 *
 * Per default #include scripts are stripped off opening <?php and closing PHP
 * tags. And literal C header .h files have content output disabled per default.
 *
 */

#ifndef OMIT_NAMESPACE
namespace io
{
use \stdClass, \ArrayAccess, \SplStack,
    \Exception, \OutOfBoundsException;
#endif


/**
 * MacroProcessor assembles the input source file with all its #include deps,
 * and handles conditional sections (via MacroExpression).
 * 
 *  Β· Main invocation method is ->on($filename). Which is meant/named as simple
 *    array_map() callback for file lists.
 *    Can also be pre-invoked to parse any includes.h, but discard output.
 *
 *  Β· Basic source assembly could alternatively be run via ->block($source).
 *
 * After the complete source code has been collected, passes over macro and
 * constant expansion to MacroInjector for tokenizer/regex substitutions.
 *
 */
class MacroProcessor {

    /**
     * Search paths for #include instructions.
     * Filename extensions .ph / .h / .php / .inc are probed for.
     */
    var $dirs = [
        ".",
        "/usr/include/",
        "/usr/include/php5",
    ];

    /**
     * Processing behaviour / status flags,
     * can be overridden with #pragma(output=0)
     */
    var $pragma = [
        "output" => 1,            # Join further file content into output.
        "encoding" => "UTF-8",    # unused
        "file" => 0,              # Currently processed file.
        "line" => 0,              # Track parsed line number (somewhat inexact).
        "input" => NULL,          # Input filename
        "target" => NULL,         # Target filename
        "omit" => "*.{h,def}",    # Like output=0, but for specific include file extensions.
        "comments" => 1,          # Retain inline /*comments*/ for constants.
        "macros" => 1,            # Read macro definitions (disable for e.g. system/*.h includes).
        "complex" => 1,           # Allows complex macros (PHP callback code).
        "multipass" => 0,         # Resursively expand basic macros in basic macros.
        "keep_empty" => 0,        # Retain empty lines for #directives.
        "fail" => 0,              # Abort with Exception instead of just printing to stderr.
        "quiet" => 0,             # Suppress stderr warnings.
        "interpolate" => "token", # Or "regex" mode, or "erb", "phpp", or "delim << >>" for custom delimiters.
        "dirs" => NULL,           # Append include -I search paths.
        "preserve" => "output,file,line",  # Pragma states to retain between #includes
    ];

    // Updated via versionnum
    const PHREP_VERSION = "0.1.8-4";

    /**
     * Predefined and collected constants and macros.
     */
    var $defines = [

       #-- Predeclare some C-style constants
       "__STDC_VERSION__" => [null, 201112],
       "__PHP_VERSION__" => [null, PHP_VERSION],
       "__PHREP_VERSION__" => [null, self::PHREP_VERSION],
       "__FLT_EPSILON__" => [null, 1.1920928955078E-7],
       "__TIMESTAMP__" => false,  // ISO datetime string
       "__BASE_FILE__" => false,  // set via constructor

       #-- Basic macros
       "INLINE_MAX" => [["a","b"], "((a)>(b)?(a):(b))"],

       #-- PHP expression transformation macros
       "IFSET@" => [["expr"], '{ return "(isset($expr) ? ($expr) : NULL)"; }'],
    ];


    /**
     * Regexps to match/split, assert or replace code and directive sections.
     *
     */

    // Directive splitting
    const RX_DIRECTIVES = "{
      ^ (?:[ ]? (?:\#|//) (?=[ ]))? [ ]{0,2}            # preprocess.py prefixes
      \# (include(?=\s)|define|undef|stderr|srcout      # allowed directives
         |ifndef|ifdef|if|elif|else|endif|pragma)
         ( (?>\V*(?:\R|\Z))                             # arguments and multi-line
         (?>(?<=\\\\\\n|\\\\\\r\\n|\\\\\\r)\V*\R)* )    # expressions via <\\><NL>
    }mx"; // <?

    // Restrict #pragma syntax
    const RX_PRAGMA = "/^
        ( \( \s* )?           (?<key>\w+)               # either (..) enclosed
        (?(1) \s*=\s* | \s+)  (?<val>.*)                # then key=val
        (?(1) \s*\)   | $)                              # or just #pragma key val
    $/sx";

    const RX_DEFINE = "/^
        (?<name>\w+@?) (?<args>\((?:\w+\.*(?:\h*,\h*\w+\.*)* )?\))?
        (?:[=\s]\s* (?<val>.*))?
    $/six";

    // Constrain #include filename syntax
    const RX_INCLUDE_FN = "/^
       ^(?!\() ([\"\'\<])?                # valid enclosures < or \", not (
       ((?: [^\s\'\"\<\>\\\\]+ | \\\\.)+) # no quotes, str backslash escapes
       (?(1)[\>\'\"]|) (?<!;)             # assert enclosures, no trailing ;
    $/x";

    // Used to strip open/close tags
    const RX_PHP_TOKEN = "/
       ^ (\\xEF\\xBB\\xBF)? \s{0,5}       # strip UTF-8 BOM, max 5 spaces
         \<\?(php)?        (\h*\R)?       # open token, optionally HS+NL
       | \?\>             \s{0,20}$       # close token, optional spaces
    /x";



    /**
     * Initialize further pragmas, runtime #defines, and #include search paths.
     *
     * @param  array   Include search paths.
     * @param  array   Inject custom defines.
     *
     */
    public function __construct($include_dirs=[], $defines=[]) {
    
        $this->dirs = array_merge($this->dirs, $include_dirs);
        
        // Non-static runtime constants
        $this->defines += $defines + [
            "__TIMESTAMP__" => [null, gmstrftime("%Y-%m-%dT%H:%M:%SZ")],
            "__BASE_FILE__" => [null, & $this->pragma["input"]],
        ];
    }


    /**
     * Output PHP warnings during preprocessing
     *
     */
    public function stderr(/*int*/$errno, /*string*/$msg, $file="macro.php", $line=0, $context=[]) {
        if ($this->pragma["fail"]) {
            throw new Exception($msg, $errno);
        }
        elseif ($this->pragma["quiet"]) {
            return;
        }
        $msg = "\e[1;41m$msg\e[0m";
        if ($errno) {
            $msg = "\e[33;1m[$errno]\e[0m $msg";
        }
        if (1||$this->pragma["file"]) {
            $msg .= " (\e[2mprocessing \e[0;33m{$this->pragma['file']}:{$this->pragma['line']}\e[0m)";
        }
        if ($file && $line) {
            $msg .= " \e[36min $file:$line\e[0m";
        }
        fwrite(STDERR, "$msg\n");
    }
    
    
    /**
     * Main invocation method
     * ––––––––––––––––––––––
     *
     * Reads and transform source file.
     * Returns fully assembled and constant/macro-substituted output.
     * Does not write to target file itself.
     *
     * @param  string  main input filename
     * @return string  conjoined and substituted source
     *
     */
    public function on(/*string*/$fn) {

        // Enable STDERR reporting during runtime
        set_error_handler([$this, "stderr"]);

        // Read main file, process #directives between regex-split source blocks
        $this->pragma["input"] = $fn;
        $this->pragma["file"] = $fn;
        $output = $this->block(file_get_contents($fn));

        // Apply macros and constants in tokenization phase
        $inj = new MacroInjector($this->defines);
        $output = $inj->substitute($output, $this->pragma["interpolate"]);
        
        restore_error_handler();        
        return $output;
    }



    /**
     * Handle #directives
     * ––––––––––––––––––
     *
     * Regex-splits the source code, traverses it block-wise.
     * Handles #define, #if, #ifdef, #ifelse, #endif statements,
     * traverses into #include files, and honors #pragma overrides.
     *
     * @param  string  source code to apply #directives on
     * @return string  assembled source files
     *
     */
    public function block(/*string*/ $src, $out="") {

        // Split source into a list of ["#directive", "args/expr", "source file content.."] blocks
        $src = array_chunk(
            array_merge(
                ["pragma", "(start=block)"] /* dummy prefix directive */,
                preg_split(self::RX_DIRECTIVES, $src, -1, PREG_SPLIT_DELIM_CAPTURE)
            ),  3
        );

        // Condition block nesting levels, and active/done state tracking
        $ΒΆ = new ConditionState();
        
        // Run over each #directive + content block
        while ($block = array_shift($src)) {
            $directive = $block[0];
            $args = trim(preg_replace("/\\s*\\\\(\R)/", "$1", $block[1]));
            $pragma_lines = substr_count($block[1], "\n");

            // Dispatch or handle #directives
#           print "#$directive $args / t=$ΒΆ->true d=$ΒΆ->done\n";
            switch ($directive) {

                case "if": 
                case "ifdef": 
                case "ifndef":
                    if ($ΒΆ->true) {
                        if ($directive == "if") {
                            $args = MacroExpression::strval($args, $this);
                        }
                        else {
                            $args = isset($this->defines[$args]) ^ ($directive == "ifndef");
                        }
                        $ΒΆ->level = +1;
                        $ΒΆ->done = $ΒΆ->true = intval($args);
                    }
                    else {
                        $ΒΆ->level = +1;
                    }
                    break;

                case "else":
                    $args = "1";
                case "elif":
                    if ($ΒΆ->done) {
                        $ΒΆ->true = 0;
                    }
                    elseif ($ΒΆ->true = MacroExpression::intval($args, $this)) {
                        $ΒΆ->done = 1;
                    }
                    break;
                
                case "endif":
                    $ΒΆ->level = -1;
                    break;

                case "macro": $directive = "define";
                case "define":
                case "undef":
                case "include":
                case "stderr":
                case "srcout":
                case "pragma":
                    if ($ΒΆ->true) {
                        $out .= $this->{"d_$directive"}($args);
                    }
                    break;

                default:  // Do nothing (custom directives go in RX_DIRECTIVES)
            }
#           echo "#state ", json_encode(array_reverse(iterator_to_array($ΒΆ))), "\n";

            // Append output block / or empty lines
            $pragma_lines = substr_count($block[1], "\n");
            $output_lines = substr_count($block[2], "\n");
            if ($this->pragma["output"]) {
                if ($ΒΆ->true) {
                    $out .= $block[2];
                }
                elseif ($this->pragma["keep_empty"]) {
                    $out .= str_repeat("\n", $pragma_lines);
                    if (!$ΒΆ->true) {
                        $out .= str_repeat("\n", $output_lines);
                    }
                }
            }
            $this->pragma["line"] += $pragma_lines;
            $this->pragma["line"] += $output_lines;
        }
        return $out;
    }


    /**
     * Constant/Macro declarations take the form:
     *   β†’ #define CONSTANT 1.2.3
     *   β†’ #define MACRO(X,Y) X > Y
     *   β†’ #define PHPEXP@(args...) { return "[$args]"; }
     */
    function d_define($decl) {
        if (preg_match(self::RX_DEFINE, $decl, $d)) {
            $val = $args = NULL;
            extract($d);
            if (isset($args)) {
                preg_match_all("/\w+/", $d["args"], $m) and $args = $m[0];
                // Collecting macros can be disabled per #pragma
                if (!$this->pragma["macros"]) {
                    return;
                }
            }
            elseif (!$this->pragma["comments"]) {
                $val = preg_replace("~/\*.+?\*/|//\V+\R?~", "", $val);
            }
            $this->defines[$name] = array($args, $val);
        }
        else {
            $this->stderr(3, "Unrecognized #define statement syntax. '$decl'");
        }
    }

    /**
     * Removes declared constants or macros.
     *   β†’ #undef CONSTANT
     */
    function d_undef($name) {
        unset($this->defines[$name]);
    }

    /**
     * Just prints out a warning/error message
     *
     */
    function d_stderr($name) {
        $this->stderr(5, $name);
    }

    /**
     * Injects commented out `#srcout code();` code - for conditional sections (with state=true).
     *
     */
    function d_srcout($line) {
        return $line . "\n";
    }

    /**
     * Sets processing options.
     *   β†’ #pragma(output=1)
     *   β†’ #pragma(target=bld/output_fn.php)
     *   β†’ #pragma(interpolate=erb)
     */
    function d_pragma($args) {
        if (assert(preg_match(self::RX_PRAGMA, $args, $pm) and extract($pm))) {
            $this->pragma[$key = strtolower($key)] = $val;
            if (method_exists($this, "p_$key")) {
                $this->{"p_$key"}($key, $val);
            }
        }
    }
    // Pragma hook: dirs
    function p_dirs($key, $val) {
        assert('strstr($val, "\\\\") /* Ahem, forward slashes work on Windows too (ever since DOS 2.0). */');
        $this->dirs = array_unique(array_merge($this->dirs, preg_split("/(?<!(:|^)\w):/", $val)));
    }

    /**
     * Include files get conjoined (.php or .ph) or C header files (.h) just parsed for constants/macros.
     * Looks through the defined include ->dirs, optionally tests file extensions (.ph, .php, .inc, .h)
     *   β†’ #include lib/deps.php
     *   β†’ #include "deps.ph"
     *   β†’ #include <errno.h>
     */
    function d_include($fn) {
    
        // Extract filename, but eschew commented-out PHP include(); statements
        if (preg_match(self::RX_INCLUDE_FN, $fn, $m)) {
            $fn = stripcslashes($m[2]);
        }
        else {
            assert("\$fn && \$m /* invalid #include <$fn> syntax */");
            return;
        }
        // search in include dirs 
        $fn = $this->find_include($fn);
        
        // Read source, strip T_OPEN/CLOSE tokens
        $src = file_get_contents($fn);
        $src = preg_replace(self::RX_PHP_TOKEN, "", $src, 2);

        // Change and keep some states between includes
        $preserve = array_intersect_key(
            $this->pragma,       // keep: output,file,line
            array_flip(str_getcsv($this->pragma["preserve"]))
        );
        if (fnmatch($fn, $this->pragma["omit"], GLOB_BRACE)) {
            $this->pragma["output"] = 0;  // omit output for *.h and *.def headers per default
        }
        $this->pragma += array("file" => $fn, "line" => 0);

        // Run through preprocessor phase
        $src = $this->block($src);
        
        // Reset flags, return output if any
        $this->pragma += $preserve;
        return $src;
    }

        
    /**
     * Search ->dirs for #include $fn with automatic extension probing.
     *
     */
    function find_include($fn, $exts=["", ".ph", ".php", ".inc", ".h", ".p"]) {
        if (file_exists($fn)) {
            return $fn;  // bypass searching for absolute paths
        }
        foreach ($this->dirs as $dir) if (file_exists($dir)) {
            foreach ($exts as $ext) {
                if (file_exists("$dir/$fn$ext")) {
                    return "$dir/$fn$ext";
                }
            }
        }
        trigger_error("#include <$fn> not found");
    }

}



/**
 * Apply constants/macros
 * ––––––––––––––––––––––
 *
 * This is run after all #includes have been merged into the input file and
 * all #defines and #pragmas have been collected.
 *
 */
class MacroInjector {

    /**
     * Inherit $defines as collected by MacroProcessor parent.
     *
     * @param  object  parent
     */
    function __construct($defines) {
        $this->defines = $defines;
    }
    
    // Parent attributes
    var $defines;

    // Used in #pragma(interpolate=regex) replacement mode, optional delimiter args
    const RX_MACROS = "
        (?<=\W)                           # extra delimiters must be non-alpha
        (\w+@?)                           # defined name
        (\( ((?:[^()]*+ | (?-2))*) \))?   # parenthesized arguments to macro
        (?=\W)
    ";

    // Use #pragma interpolate=erb for known delimiter prefixes/suffixes
    static $rx_delim_named = [
        "rx" => [null, null, "", ""],
        "erb" => [null, null, "%{", "}"],
        "phpp" => [null, null, "{{{", "}}}"],
    ];


    /**
     * Substitutes preprocessor-#defined CONSTANTS and MACROS(x,y) in the
     * assembled source string.
     *
     * Either uses a regex extraction mode, or the tokenizer.
     *
     * @param  string  source code
     * @param  string  interpolation mode
     * @result string  constants and macros substituted
     *
     */
    public function substitute($src, $mode="token") {
        
        // "Simple" regex lookups
        if (preg_match("/^(regex|rx|erb|phpp|delim)\b[,\s]*([^\s,]*)[,\s]*([^\s,]*)$/", $mode, $delim)) {

            // Custom or predefined delimiters
            if (empty($delim[2]) and empty($delim[3]) and isset(self::$rx_delim_named[$delim[1]])) {
                $delim = self::$rx_delim_named[$delim[1]];
            }

            // Substitute constants and macros in-place.
            $src = preg_replace_callback("/ \Q$delim[2]\E  " . self::RX_MACROS . " \Q$delim[3]\E /x",

                function($m) {
                    if (empty($this->defines[$m[1]])) {
                        return $m[0];
                    }
                    list($keys, $repl) = $this->defines[$m[1]];
                    if ($keys) {
                        if (empty($m[2])) {
                            return $m[0];   // Macro const used without (params)
                        }
                        $args = preg_split("/\s*,\s*/", $m[3]);
                        return $this->expand_macro($m[1], $keys, $args, $repl, [], FALSE);
                    }
                    else {
                        return $repl;   // Just a constant
                    }
                },
                $src
            );
        }

        // Tokenizer mode: looks for T_STRINGs that match collected #defines and #macros
        else {
            $src = $this->token_join(
                $this->token_substitute(
                    token_get_all($src)
                )
            );
        }        

        return $src;
    }


    /**
     * Tokenize and scan for T_STRINGs and optional @s,
     * and assert we're not following some constructs (e.g. const= declarations).
     *
     */
    function token_substitute($token) {
        $prev = $type = $next = T_WHITESPACE;
        $max = count($token) - 1;
        $defs = & $this->defines;

        // Only stop for array token entries
        for ($i=0; $i < $max; $i++) {

            // Look only at array tokens, T_STRING literals, not preceded by "const"
            if (!is_array($t = $token[$i]) || $t[0] != T_STRING || $prev === T_CONST) {
                continue;
            }
            list($type, $name, $line) = $t;
            $next = $token[$i + 1][0]; // careless

            // Pure constant
            if (isset($defs[$name][1]) && is_null($defs[$name][0])) {  //@T also invoke for empty MACRO() params?
                $token[$i] = $defs[$name][1];
            }

            // Macros
            elseif (isset($defs[$name][1])     // Basic macros without trailing "@"
                or ($next === "@") and isset($defs[$name .= $next][1])) // Complex callback macro name
            {
                list($keys, $code) = $defs[$name];     // Assemble (parameter,list,...)
                list($str_args, $tok_args, $tok_len) = $this->token_args($token, $i);
                array_splice(  // Replace grouped tokens with a single text blob
                    $token, $i, $tok_len,
                    [[T_FUNC_C, $this->expand_macro($name, $keys, $str_args, $code, $tok_args, $cplx="?"), -1]]
                );
                $max = count($token) - 1;
            }

            // Remember type for context
            if ($type !== T_WHITESPACE && $type !== T_COMMENT) {
                $prev = $type;
            }
        }
        return $token;
    }


    /**
     * Rebuild src output
     *
     */
    function token_join($token) {        
        return join(array_map(
            function($t) {
                return is_array($t) ? $t[1] : $t;
            },
            $token
        ));
    }


    /**
     * Find stuff between paired `(`, `)` parens, split on `,` commas into arguments.
     *
     * Returns a stringified list of parameters, a token list for each parameter,
     * and cumulative token count/length.
     *
     */
    function token_args($token, $i) {
        $params = [];
        $arg = [];
        $len = 1;
        $level = NULL;
        for ($i+=1; $i < count($token) && $level !== 0; $i++, $len++) {
            if (is_string($t = $token[$i])) {
                if ($t == "(") {
                    $level++;
                    if ($level == 1) continue;
                }
                elseif ($t == ")") {
                    $level--;
                }
                elseif ($t == "," and $level == 1) {
                    $params[] = $arg;
                    $arg = [];
                    continue;
                }
            }
            if ($level >= 1) {
               $arg[] = $t;
            }
#           print "search(,) #$i $t[0]\n";
        }
        if ($arg) {   // remaining tokens
            $params[] = $arg;
        }
        return [array_map([$this, "token_join"], $params), $params, $len];
        //@T move main &$token updating through array_splice here?
    }

    

    /**
     * Expand macros. (Used by regex and tokenizer modes.)
     *
     * @param  string  Constant "NAME" or macro "BASIC" or "COMPLEX@"
     * @param  array   List of macro keys ["a","b","expr"]
     * @param  array   List of param values/expressions as strings ["$a", "$b", "3.0+func()"]
     * @param  string  Macro template "(a+b>c)" or PHP func "{return "$a+$b>c";}"
     * @param  array   List of tokens for each param/expr [ [T_VAR "$a", ">", T_VAR "$b"], [T_VAR "$c", T_INCR "++"], ...]
     */
    function expand_macro($name, $keys, $args, $body, $token=[], $complex_macro) {

        // Complex
        if ($complex_macro = is_int(strpos($name, "@"))) {
            $php_keys = "\$token";
            $php_args = [$token];
            foreach ($keys as $key) {
                if (is_int(strpos($key, ".."))) {
                    $php_keys .= ",\$$key";  // Let's have our own variadic params, with blackjack and stuff
                    $php_args[] = $args;
                    break;
                }
                else {
                    $php_keys .= ",\$$key";
                    $php_args[] = count($args) ? array_shift($args) : NULL;
                }
            }
#           print "MACRO n=$name, c=$complex_macro, $php_keys, $body\n";
            $body = call_user_func_array(create_function($php_keys, $body), $php_args);
        }
        
        // Basic/standard macros
        else {
            foreach ($keys as $i=>$k) {
#               print "MACROKEY $i -> $k\n";
                if (is_int(strpos($k, ".."))) {
                    $k = trim($k, ".");
                    $body = preg_replace("/(\s*##\s*)?\b\Q$k\E\b/", var_export(array_slice($args, $i), TRUE), $body);
                }
                else {
                    $body = preg_replace("/(\s*##\s*)?\b\Q$k\E\b/", $args[$i], $body);
                }
                # add __VA_ARGS__
                # and #str encasing
            }
        }
        return $body;
    }
    
}



/**
 * More readable tracking of #if..#endif nesting levels, with some attributes:

 *   ->level  Nesting / stack length. Each #if/ifdef/endif block will start a new stack.
 *   ->true   Output active and conditional sections still activatable - gets *inherited*.
 *   ->done   Condition block passed its one active section, no further #elif/#else leaves
 *            can be activated. An #endif terminates the stack, resumes to the prior, where
 *            ->true=1 and ->done=0 still.
 *
 * Note that each #included file gets a fresh condition stack in the ->block()
 * processor. Instances only track conditional nesting within one file. Once
 * true==false, #includes will not be processed anyway.
 *
 */
class ConditionState extends SplStack {

    function __construct() {
        $this->push(["level" => 0, "true" => "1", "done" => 0]);
    }

    function __get($name) {
        if ($name == "level") {  // level equals stack length
            return $this->count() - 1;
        }
        else {
            $s = $this->top();   // single state attrib
            return $s[$name];
        }
    }

    function __set($name, $value) {
        if ($name == "level" and $value < 0) {
            assert('$this->level > 0 and $value == -1 /* incorrect #if/#endif nesting */');
            $this->pop();         // can only -1 pop or +1 add a new level
        }
        elseif ($name == "level" and $value >= 0) {
            assert('$value == +1 /* can only iterate one level at a time */');
            $this->push(["level" => $this->level + 1, "true" => $this->true, "done" => 0]);
        }
        else {
            $s = $this->pop();   // modify state attribute in last stack entry
            $s[$name] = $value;
            $this->push($s);
        }
    }
}



/**
 * #if/#elif expression evaluation. Permits common arithmetics, #define lookups,
 * a few hand-picked PHP callbacks, and decimal/float/tuple comparisons.
 * It's neither fully CPP compatible, nor in line with preprocess.py; and it's
 * likely pointless featuritis anyway.
 *
 * Uses a trivial shunting-yard sorting method for its tokenized input, then
 * evaluates expressions down to a numeric or booleanish scalar. Has only minimal
 * error reporting, and operator/func precedence is incomplete/untuned..
 *
 */
class MacroExpression {

    # Expression tokens
    const RX_EXPR = "{
         (?: [\"\'](?<string>.*?)[\"\'])        # plain strings, no escape checking
       | (?<func>    defined|stri?pos|stri?str|is_int|is_float|max|min) # functions
       | (?<op>      >=|<=|==|!=|=~|\&\&|\|\| | [+-/*^~&|(),%!<>] )     # operators
       | (?<number>  [+-]?\d+(?:\.\d+)*)        # can be multi-tuple version string
       | (?<literal> [\w_]+@?)                  # defined constants
    }mx";


    // Inherit from parent for constant lookups
    public $defines = [];
    function __construct($defines=[]) {
        $this->defines = $defines;
    }

    // Run expression through `intval` etc.
    public static function __callStatic($name, $args) {
        $x = new self(count($args) >= 2 ? $args[1]->defines : []);
        return call_user_func($name, $x->expr($args[0]));
    }


    /**
     * Tokenize expression,  into a list of [type, value] pairs.
     *
     */
    public function expr($src) {
        // Shortcuts
        if ($src === "1" or $src === "0") {
            return intval($src);
        }
        
        // Regex returns a list of optional [0]=>, [type]=>, [1]=> matches
        preg_match_all(self::RX_EXPR, $src, $tokens, PREG_SET_ORDER);
        $tokens = array_map(function($t) {
            return array_slice($t, -2, 1); // turn last named entry into [type=>value]* list
        }, $tokens);
        
        // Reorder by precedence into RPN
        $opvals = $this->group($tokens);

        // Apply operations
        return $this->run($opvals);
    }


    /**
     * Run through tokens, spool values+operators into reverse polish notation.
     * [2, 3, 5, *, +]  or for example  [CONST, defined, 1, >=]
     *
     */
    function group($tokens) {

        // operator precedence list
        $prec = " () , || && == >= > <= < == !== !?: ! & | ^ + - * / % ~";
        $var = [];   // operand queue
        $ops = [];   // operator stack

        // .iteritems() over token list
        while ($t = array_shift($tokens)) {
            $type = key($t);
            $val = current($t);

            // literals
            if (strpos("(literal|number|string)", $type)) {
                $var[] = $val; #[$type, $val];
            }
            
            // parenthesis grouping
            elseif (($val == "(") or ($type=="func")) {
                $ops[] = $val;
            }
            elseif ($val == ")") {
                while (count($ops) && (end($ops) != "(")) {
                   $var[] = $val = array_pop($ops);
                }
                array_pop($ops);
            }
            
            // add to operator queue
            else {
                while (count($ops) and (strpos($prec, $val) < strpos($prec, $end = end($ops))) /*and $end != "("*/) {
                    $var[] = array_pop($ops);  
                }
                $ops[] = $val;
            }
#       echo "VAR_STACK := ", json_encode($var), "\n";
#       echo "OPS_STACK := ", json_encode($ops), "\n";
        }

        // append remaining operators
        $var = array_merge($var, array_reverse($ops));
#       echo "(GROUP_FINAL := ", json_encode($var), ") ";
        return $var;
    }


    /**
     * Plop values of list, apply expressions or function callbacks as ordered.
     * (Operand relation overriden here as $pop(NN) parameter.)
     *
     */
    function run(&$opvals) {

        // prepare value stack
        $sum = [];
        $pop = function($prev=1) use (&$sum) { 
            assert('count($sum) >= $prev /* Empty value stack, unbalanced expressions. */'); # OutOfBounds
            $v = array_splice($sum, -$prev, 1, []);
            return current($v);
        };

        // Dispatch value literals as encountered operations
        // (Rather should carry the token types over. Would also simplify ordering operands.)
        while (count($opvals)) {
            $e = array_shift($opvals);
            switch ($e) {
                case "!":  $r = !$pop();  break;
                case "~":  $r = ~intval($pop());  break;
                case "+":  $r = $pop(1) + $pop(1);  break;
                case "-":  $r = -$pop(); $r += $pop();  break;
                case "*":  $r = $pop(1) * $pop(1);  break;
                case "/":  $r = $pop(2) / $pop(1);  break;
                case "^":  $r = intval($pop(1)) ^ intval($pop(1));  break;
                case "&":  $r = $pop(1) & $pop(1);  break;
                case "|":  $r = $pop(1) | $pop(1);  break;
                case "%":  $r = $pop(1) % $pop(1);  break;
                case "&&": $x = $pop(); $y = $pop(); $r = intval($x && $y); break;
                case "||": $x = $pop(); $y = $pop(); $r = intval($x || $y); break;
                case "==": $r = $pop(1) == $pop(1);  break;
                case "!=": $r = $pop(1) != $pop(1);  break;
               #case "?:": /* needs splitting in ? and : op, unless it should become TCL-style */ $r = $pop() ? $pop() : $pop();  break;
                case ">":  $r = version_compare($pop(), $pop()) < 0;   break;
                case "<":  $r = version_compare($pop(), $pop()) > 0;   break;
                case ">=": $r = version_compare($pop(), $pop()) <= 0;  break;
                case "<=": $r = version_compare($pop(), $pop()) >= 0;  break;
                case "=~": $r = preg_match("\1{$pop()}\1sim", $pop());   break;
                case ",":  $r = array_merge((array)$pop(), (array)$pop()); break;
                default:
                    if ($e == "defined") {
                        $x = $pop();
                        $r = !is_null($x) || isset($this->defines[$x]);
                    }
                    elseif (is_callable($e) and preg_match(self::RX_EXPR, $e, $verify) and !empty($verify["func"])) {
                        $x = array_reverse($pop());  // params have been arrayified through , operator
                        $r = call_user_func_array($e, $x);
                    }
                    elseif (isset($this->defines[$e])  // define literals
                       and (empty($opvals) or $opvals[0] !== "defined")) { // but skip CONST,defined
                        $r = $this->defines[$e][1];
                    }
                    else {  // numbers and strings or constants
                        $r = $e;
                    }
            }
            $sum[] = $r;
#           printf(" %26s ➫ %-8s πŸ”›  %16s ← %4s\n", join(" ", $opvals), "{$e}", json_encode($sum), json_encode($r));
        }

        return count($sum) == 1
             ? current($sum)
             : trigger_error("Expression leftovers, result discarded.") && NULL; # OutOfBounds
    }
    
}


#include <license.ph>

#ifndef OMIT_NAMESPACE
} # namespace \io
#endif
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