185 lines
5.9 KiB
PHP
185 lines
5.9 KiB
PHP
<?php
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///////////////////////////////
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/// Utility regex constants ///
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///////////////////////////////
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const LIB = '(?(DEFINE)
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(?<singleQuotedString>\'[^\\\\\']*+(?:\\\\.[^\\\\\']*+)*+\')
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(?<doubleQuotedString>"[^\\\\"]*+(?:\\\\.[^\\\\"]*+)*+")
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(?<string>(?&singleQuotedString)|(?&doubleQuotedString))
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(?<comment>/\*[^*]*+(?:\*(?!/)[^*]*+)*+\*/)
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(?<code>\{[^\'"/{}]*+(?:(?:(?&string)|(?&comment)|(?&code)|/)[^\'"/{}]*+)*+})
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)';
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const PARAMS = '\[(?<params>[^[\]]*+(?:\[(?¶ms)\][^[\]]*+)*+)\]';
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const ARGS = '\((?<args>[^()]*+(?:\((?&args)\)[^()]*+)*+)\)';
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///////////////////////////////
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/// Preprocessing functions ///
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///////////////////////////////
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function preprocessGrammar($code) {
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$code = resolveNodes($code);
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$code = resolveMacros($code);
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$code = resolveStackAccess($code);
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return $code;
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}
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function resolveNodes($code) {
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return preg_replace_callback(
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'~\b(?<name>[A-Z][a-zA-Z_\\\\]++)\s*' . PARAMS . '~',
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function($matches) {
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// recurse
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$matches['params'] = resolveNodes($matches['params']);
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$params = magicSplit(
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'(?:' . PARAMS . '|' . ARGS . ')(*SKIP)(*FAIL)|,',
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$matches['params']
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);
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$paramCode = '';
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foreach ($params as $param) {
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$paramCode .= $param . ', ';
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}
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return 'new ' . $matches['name'] . '(' . $paramCode . 'attributes())';
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},
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$code
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);
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}
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function resolveMacros($code) {
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return preg_replace_callback(
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'~\b(?<!::|->)(?!array\()(?<name>[a-z][A-Za-z]++)' . ARGS . '~',
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function($matches) {
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// recurse
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$matches['args'] = resolveMacros($matches['args']);
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$name = $matches['name'];
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$args = magicSplit(
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'(?:' . PARAMS . '|' . ARGS . ')(*SKIP)(*FAIL)|,',
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$matches['args']
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);
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if ('attributes' === $name) {
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assertArgs(0, $args, $name);
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return '$this->startAttributeStack[#1] + $this->endAttributes';
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}
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if ('stackAttributes' === $name) {
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assertArgs(1, $args, $name);
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return '$this->startAttributeStack[' . $args[0] . ']'
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. ' + $this->endAttributeStack[' . $args[0] . ']';
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}
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if ('init' === $name) {
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return '$$ = array(' . implode(', ', $args) . ')';
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}
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if ('push' === $name) {
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assertArgs(2, $args, $name);
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return $args[0] . '[] = ' . $args[1] . '; $$ = ' . $args[0];
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}
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if ('pushNormalizing' === $name) {
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assertArgs(2, $args, $name);
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return 'if (is_array(' . $args[1] . ')) { $$ = array_merge(' . $args[0] . ', ' . $args[1] . '); }'
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. ' else { ' . $args[0] . '[] = ' . $args[1] . '; $$ = ' . $args[0] . '; }';
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}
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if ('toArray' == $name) {
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assertArgs(1, $args, $name);
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return 'is_array(' . $args[0] . ') ? ' . $args[0] . ' : array(' . $args[0] . ')';
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}
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if ('parseVar' === $name) {
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assertArgs(1, $args, $name);
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return 'substr(' . $args[0] . ', 1)';
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}
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if ('parseEncapsed' === $name) {
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assertArgs(3, $args, $name);
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return 'foreach (' . $args[0] . ' as $s) { if ($s instanceof Node\Scalar\EncapsedStringPart) {'
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. ' $s->value = Node\Scalar\String_::parseEscapeSequences($s->value, ' . $args[1] . ', ' . $args[2] . '); } }';
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}
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if ('makeNop' === $name) {
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assertArgs(3, $args, $name);
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return '$startAttributes = ' . $args[1] . ';'
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. ' if (isset($startAttributes[\'comments\']))'
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. ' { ' . $args[0] . ' = new Stmt\Nop($startAttributes + ' . $args[2] . '); }'
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. ' else { ' . $args[0] . ' = null; }';
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}
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if ('makeZeroLengthNop' == $name) {
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assertArgs(2, $args, $name);
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return '$startAttributes = ' . $args[1] . ';'
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. ' if (isset($startAttributes[\'comments\']))'
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. ' { ' . $args[0] . ' = new Stmt\Nop($this->createCommentNopAttributes($startAttributes[\'comments\'])); }'
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. ' else { ' . $args[0] . ' = null; }';
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}
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if ('prependLeadingComments' === $name) {
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assertArgs(1, $args, $name);
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return '$attrs = $this->startAttributeStack[#1]; $stmts = ' . $args[0] . '; '
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. 'if (!empty($attrs[\'comments\'])) {'
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. '$stmts[0]->setAttribute(\'comments\', '
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. 'array_merge($attrs[\'comments\'], $stmts[0]->getAttribute(\'comments\', []))); }';
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}
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return $matches[0];
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},
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$code
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);
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}
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function assertArgs($num, $args, $name) {
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if ($num != count($args)) {
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die('Wrong argument count for ' . $name . '().');
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}
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}
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function resolveStackAccess($code) {
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$code = preg_replace('/\$\d+/', '$this->semStack[$0]', $code);
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$code = preg_replace('/#(\d+)/', '$$1', $code);
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return $code;
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}
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function removeTrailingWhitespace($code) {
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$lines = explode("\n", $code);
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$lines = array_map('rtrim', $lines);
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return implode("\n", $lines);
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}
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//////////////////////////////
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/// Regex helper functions ///
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//////////////////////////////
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function regex($regex) {
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return '~' . LIB . '(?:' . str_replace('~', '\~', $regex) . ')~';
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}
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function magicSplit($regex, $string) {
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$pieces = preg_split(regex('(?:(?&string)|(?&comment)|(?&code))(*SKIP)(*FAIL)|' . $regex), $string);
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foreach ($pieces as &$piece) {
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$piece = trim($piece);
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}
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if ($pieces === ['']) {
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return [];
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}
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return $pieces;
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}
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