355 lines
9.4 KiB
PHP
355 lines
9.4 KiB
PHP
<?php
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/**
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* Source map generator
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*
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* @package Less
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* @subpackage Output
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*/
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class Less_SourceMap_Generator extends Less_Configurable {
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/**
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* What version of source map does the generator generate?
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*/
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private const VERSION = 3;
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/**
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* Array of default options
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*
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* @var array
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*/
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protected $defaultOptions = array(
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// an optional source root, useful for relocating source files
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// on a server or removing repeated values in the 'sources' entry.
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// This value is prepended to the individual entries in the 'source' field.
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'sourceRoot' => '',
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// an optional name of the generated code that this source map is associated with.
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'sourceMapFilename' => null,
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// url of the map
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'sourceMapURL' => null,
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// absolute path to a file to write the map to
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'sourceMapWriteTo' => null,
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// output source contents?
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'outputSourceFiles' => false,
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// base path for filename normalization
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'sourceMapRootpath' => '',
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// base path for filename normalization
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'sourceMapBasepath' => ''
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);
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/**
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* The base64 VLQ encoder
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*
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* @var Less_SourceMap_Base64VLQ
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*/
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protected $encoder;
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/**
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* Array of mappings
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*
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* @var array
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*/
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protected $mappings = array();
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/**
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* The root node
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*
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* @var Less_Tree_Ruleset
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*/
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protected $root;
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/**
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* Array of contents map
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*
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* @var array
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*/
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protected $contentsMap = array();
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/**
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* File to content map
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*
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* @var array
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*/
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protected $sources = array();
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protected $source_keys = array();
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/**
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* Constructor
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*
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* @param Less_Tree_Ruleset $root The root node
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* @param array $options Array of options
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*/
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public function __construct( Less_Tree_Ruleset $root, $contentsMap, $options = array() ) {
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$this->root = $root;
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$this->contentsMap = $contentsMap;
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$this->encoder = new Less_SourceMap_Base64VLQ();
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$this->SetOptions( $options );
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$this->options['sourceMapRootpath'] = $this->fixWindowsPath( $this->options['sourceMapRootpath'], true );
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$this->options['sourceMapBasepath'] = $this->fixWindowsPath( $this->options['sourceMapBasepath'], true );
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}
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/**
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* Generates the CSS
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*
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* @return string
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*/
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public function generateCSS() {
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$output = new Less_Output_Mapped( $this->contentsMap, $this );
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// catch the output
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$this->root->genCSS( $output );
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$sourceMapUrl = $this->getOption( 'sourceMapURL' );
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$sourceMapFilename = $this->getOption( 'sourceMapFilename' );
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$sourceMapContent = $this->generateJson();
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$sourceMapWriteTo = $this->getOption( 'sourceMapWriteTo' );
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if ( !$sourceMapUrl && $sourceMapFilename ) {
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$sourceMapUrl = $this->normalizeFilename( $sourceMapFilename );
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}
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// write map to a file
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if ( $sourceMapWriteTo ) {
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$this->saveMap( $sourceMapWriteTo, $sourceMapContent );
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}
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// inline the map
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if ( !$sourceMapUrl ) {
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$sourceMapUrl = sprintf( 'data:application/json,%s', Less_Functions::encodeURIComponent( $sourceMapContent ) );
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}
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if ( $sourceMapUrl ) {
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$output->add( sprintf( '/*# sourceMappingURL=%s */', $sourceMapUrl ) );
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}
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return $output->toString();
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}
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/**
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* Saves the source map to a file
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*
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* @param string $file The absolute path to a file
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* @param string $content The content to write
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* @throws Exception If the file could not be saved
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*/
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protected function saveMap( $file, $content ) {
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$dir = dirname( $file );
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// directory does not exist
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if ( !is_dir( $dir ) ) {
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// FIXME: create the dir automatically?
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throw new Exception( sprintf( 'The directory "%s" does not exist. Cannot save the source map.', $dir ) );
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}
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// FIXME: proper saving, with dir write check!
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if ( file_put_contents( $file, $content ) === false ) {
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throw new Exception( sprintf( 'Cannot save the source map to "%s"', $file ) );
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}
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return true;
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}
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/**
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* Normalizes the filename
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*
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* @param string $filename
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* @return string
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*/
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protected function normalizeFilename( $filename ) {
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$filename = $this->fixWindowsPath( $filename );
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$rootpath = $this->getOption( 'sourceMapRootpath' );
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$basePath = $this->getOption( 'sourceMapBasepath' );
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// "Trim" the 'sourceMapBasepath' from the output filename.
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if ( is_string( $basePath ) && strpos( $filename, $basePath ) === 0 ) {
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$filename = substr( $filename, strlen( $basePath ) );
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}
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// Remove extra leading path separators.
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if ( strpos( $filename, '\\' ) === 0 || strpos( $filename, '/' ) === 0 ) {
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$filename = substr( $filename, 1 );
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}
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return $rootpath . $filename;
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}
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/**
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* Adds a mapping
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*
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* @param integer $generatedLine The line number in generated file
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* @param integer $generatedColumn The column number in generated file
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* @param integer $originalLine The line number in original file
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* @param integer $originalColumn The column number in original file
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* @param string $sourceFile The original source file
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*/
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public function addMapping( $generatedLine, $generatedColumn, $originalLine, $originalColumn, $fileInfo ) {
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$this->mappings[] = array(
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'generated_line' => $generatedLine,
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'generated_column' => $generatedColumn,
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'original_line' => $originalLine,
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'original_column' => $originalColumn,
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'source_file' => $fileInfo['currentUri']
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);
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$this->sources[$fileInfo['currentUri']] = $fileInfo['filename'];
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}
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/**
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* Generates the JSON source map
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*
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* @return string
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* @see https://docs.google.com/document/d/1U1RGAehQwRypUTovF1KRlpiOFze0b-_2gc6fAH0KY0k/edit#
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*/
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protected function generateJson() {
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$sourceMap = array();
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$mappings = $this->generateMappings();
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// File version (always the first entry in the object) and must be a positive integer.
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$sourceMap['version'] = self::VERSION;
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// An optional name of the generated code that this source map is associated with.
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$file = $this->getOption( 'sourceMapFilename' );
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if ( $file ) {
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$sourceMap['file'] = $file;
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}
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// An optional source root, useful for relocating source files on a server or removing repeated values in the 'sources' entry. This value is prepended to the individual entries in the 'source' field.
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$root = $this->getOption( 'sourceRoot' );
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if ( $root ) {
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$sourceMap['sourceRoot'] = $root;
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}
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// A list of original sources used by the 'mappings' entry.
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$sourceMap['sources'] = array();
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foreach ( $this->sources as $source_uri => $source_filename ) {
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$sourceMap['sources'][] = $this->normalizeFilename( $source_filename );
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}
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// A list of symbol names used by the 'mappings' entry.
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$sourceMap['names'] = array();
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// A string with the encoded mapping data.
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$sourceMap['mappings'] = $mappings;
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if ( $this->getOption( 'outputSourceFiles' ) ) {
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// An optional list of source content, useful when the 'source' can't be hosted.
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// The contents are listed in the same order as the sources above.
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// 'null' may be used if some original sources should be retrieved by name.
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$sourceMap['sourcesContent'] = $this->getSourcesContent();
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}
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// less.js compat fixes
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if ( count( $sourceMap['sources'] ) && empty( $sourceMap['sourceRoot'] ) ) {
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unset( $sourceMap['sourceRoot'] );
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}
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return json_encode( $sourceMap );
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}
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/**
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* Returns the sources contents
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*
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* @return array|null
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*/
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protected function getSourcesContent() {
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if ( empty( $this->sources ) ) {
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return;
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}
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$content = array();
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foreach ( $this->sources as $sourceFile ) {
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$content[] = file_get_contents( $sourceFile );
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}
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return $content;
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}
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/**
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* Generates the mappings string
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*
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* @return string
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*/
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public function generateMappings() {
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if ( !count( $this->mappings ) ) {
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return '';
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}
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$this->source_keys = array_flip( array_keys( $this->sources ) );
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// group mappings by generated line number.
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$groupedMap = $groupedMapEncoded = array();
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foreach ( $this->mappings as $m ) {
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$groupedMap[$m['generated_line']][] = $m;
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}
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ksort( $groupedMap );
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$lastGeneratedLine = $lastOriginalIndex = $lastOriginalLine = $lastOriginalColumn = 0;
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foreach ( $groupedMap as $lineNumber => $line_map ) {
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while ( ++$lastGeneratedLine < $lineNumber ) {
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$groupedMapEncoded[] = ';';
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}
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$lineMapEncoded = array();
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$lastGeneratedColumn = 0;
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foreach ( $line_map as $m ) {
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$mapEncoded = $this->encoder->encode( $m['generated_column'] - $lastGeneratedColumn );
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$lastGeneratedColumn = $m['generated_column'];
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// find the index
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if ( $m['source_file'] ) {
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$index = $this->findFileIndex( $m['source_file'] );
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if ( $index !== false ) {
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$mapEncoded .= $this->encoder->encode( $index - $lastOriginalIndex );
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$lastOriginalIndex = $index;
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// lines are stored 0-based in SourceMap spec version 3
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$mapEncoded .= $this->encoder->encode( $m['original_line'] - 1 - $lastOriginalLine );
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$lastOriginalLine = $m['original_line'] - 1;
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$mapEncoded .= $this->encoder->encode( $m['original_column'] - $lastOriginalColumn );
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$lastOriginalColumn = $m['original_column'];
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}
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}
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$lineMapEncoded[] = $mapEncoded;
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}
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$groupedMapEncoded[] = implode( ',', $lineMapEncoded ) . ';';
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}
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return rtrim( implode( $groupedMapEncoded ), ';' );
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}
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/**
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* Finds the index for the filename
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*
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* @param string $filename
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* @return integer|false
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*/
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protected function findFileIndex( $filename ) {
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return $this->source_keys[$filename];
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}
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/**
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* fix windows paths
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* @param string $path
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* @return string
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*/
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public function fixWindowsPath( $path, $addEndSlash = false ) {
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$slash = ( $addEndSlash ) ? '/' : '';
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if ( !empty( $path ) ) {
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$path = str_replace( '\\', '/', $path );
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$path = rtrim( $path, '/' ) . $slash;
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}
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return $path;
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}
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}
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