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import { basename, dirname, extname, relative, resolve } from 'path';
import { writeFile, writeFileSync } from 'sander';
import codec from '@jridgewell/sourcemap-codec';
import SourceMap from './SourceMap.js';
import slash from './utils/slash.js';
import SOURCEMAPPING_URL from './utils/sourceMappingURL.js';
const SOURCEMAP_COMMENT = new RegExp( `\n*(?:` +
`\\/\\/[@#]\\s*${SOURCEMAPPING_URL}=([^'"]+)|` + // js
`\\/\\*#?\\s*${SOURCEMAPPING_URL}=([^'"]+)\\s\\*\\/)` + // css
'\\s*$', 'g' );
export default function Chain ( node, sourcesContentByPath ) {
this.node = node;
this.sourcesContentByPath = sourcesContentByPath;
this._stats = {};
}
Chain.prototype = {
stat () {
return {
selfDecodingTime: this._stats.decodingTime / 1e6,
totalDecodingTime: ( this._stats.decodingTime + tally( this.node.sources, 'decodingTime' ) ) / 1e6,
encodingTime: this._stats.encodingTime / 1e6,
tracingTime: this._stats.tracingTime / 1e6,
untraceable: this._stats.untraceable
};
},
apply ( options = {} ) {
let allNames = [];
let allSources = [];
const applySegment = ( segment, result ) => {
if ( segment.length < 4 ) return;
const traced = this.node.sources[ segment[1] ].trace( // source
segment[2], // source code line
segment[3], // source code column
this.node.map.names[ segment[4] ]
);
if ( !traced ) {
this._stats.untraceable += 1;
return;
}
let sourceIndex = allSources.indexOf( traced.source );
if ( !~sourceIndex ) {
sourceIndex = allSources.length;
allSources.push( traced.source );
}
let newSegment = [
segment[0], // generated code column
sourceIndex,
traced.line - 1,
traced.column
];
if ( traced.name ) {
let nameIndex = allNames.indexOf( traced.name );
if ( !~nameIndex ) {
nameIndex = allNames.length;
allNames.push( traced.name );
}
newSegment[4] = nameIndex;
}
result[ result.length ] = newSegment;
};
// Trace mappings
let tracingStart = process.hrtime();
let i = this.node.mappings.length;
let resolved = new Array( i );
let j, line, result;
while ( i-- ) {
line = this.node.mappings[i];
resolved[i] = result = [];
for ( j = 0; j < line.length; j += 1 ) {
applySegment( line[j], result );
}
}
let tracingTime = process.hrtime( tracingStart );
this._stats.tracingTime = 1e9 * tracingTime[0] + tracingTime[1];
// Encode mappings
let encodingStart = process.hrtime();
let mappings = codec.encode( resolved );
let encodingTime = process.hrtime( encodingStart );
this._stats.encodingTime = 1e9 * encodingTime[0] + encodingTime[1];
let includeContent = options.includeContent !== false;
return new SourceMap({
file: basename( this.node.file ),
sources: allSources.map( source => slash( relative( options.base || dirname( this.node.file ), source ) ) ),
sourcesContent: allSources.map( source => includeContent ? this.sourcesContentByPath[ source ] : null ),
names: allNames,
mappings
});
},
trace ( oneBasedLineIndex, zeroBasedColumnIndex ) {
return this.node.trace( oneBasedLineIndex - 1, zeroBasedColumnIndex, null );
},
write ( dest, options ) {
if ( typeof dest !== 'string' ) {
options = dest;
dest = this.node.file;
}
options = options || {};
const { resolved, content, map } = processWriteOptions( dest, this, options );
let promises = [ writeFile( resolved, content ) ];
if ( !options.inline ) {
promises.push( writeFile( resolved + '.map', map.toString() ) );
}
return Promise.all( promises );
},
writeSync ( dest, options ) {
if ( typeof dest !== 'string' ) {
options = dest;
dest = this.node.file;
}
options = options || {};
const { resolved, content, map } = processWriteOptions( dest, this, options );
writeFileSync( resolved, content );
if ( !options.inline ) {
writeFileSync( resolved + '.map', map.toString() );
}
}
};
function processWriteOptions ( dest, chain, options ) {
const resolved = resolve( dest );
const map = chain.apply({
includeContent: options.includeContent,
base: options.base ? resolve( options.base ) : dirname( resolved )
});
const url = options.inline ? map.toUrl() : ( options.absolutePath ? resolved : basename( resolved ) ) + '.map';
// TODO shouldn't url be relative?
const content = chain.node.content.replace( SOURCEMAP_COMMENT, '' ) + sourcemapComment( url, resolved );
return { resolved, content, map };
}
function tally ( nodes, stat ) {
return nodes.reduce( ( total, node ) => {
return total + node._stats[ stat ];
}, 0 );
}
function sourcemapComment ( url, dest ) {
const ext = extname( dest );
url = encodeURI( url );
if ( ext === '.css' ) {
return `\n/*# ${SOURCEMAPPING_URL}=${url} */\n`;
}
return `\n//# ${SOURCEMAPPING_URL}=${url}\n`;
}
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