You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
730 lines
23 KiB
730 lines
23 KiB
# Source Map
|
|
|
|
[](https://travis-ci.org/mozilla/source-map)
|
|
|
|
[](https://www.npmjs.com/package/source-map)
|
|
|
|
This is a library to generate and consume the source map format
|
|
[described here][format].
|
|
|
|
[format]: https://docs.google.com/document/d/1U1RGAehQwRypUTovF1KRlpiOFze0b-_2gc6fAH0KY0k/edit
|
|
|
|
## Use with Node
|
|
|
|
$ npm install source-map
|
|
|
|
## Use on the Web
|
|
|
|
<script src="https://raw.githubusercontent.com/mozilla/source-map/master/dist/source-map.min.js" defer></script>
|
|
|
|
--------------------------------------------------------------------------------
|
|
|
|
<!-- `npm run toc` to regenerate the Table of Contents -->
|
|
|
|
<!-- START doctoc generated TOC please keep comment here to allow auto update -->
|
|
<!-- DON'T EDIT THIS SECTION, INSTEAD RE-RUN doctoc TO UPDATE -->
|
|
## Table of Contents
|
|
|
|
- [Examples](#examples)
|
|
- [Consuming a source map](#consuming-a-source-map)
|
|
- [Generating a source map](#generating-a-source-map)
|
|
- [With SourceNode (high level API)](#with-sourcenode-high-level-api)
|
|
- [With SourceMapGenerator (low level API)](#with-sourcemapgenerator-low-level-api)
|
|
- [API](#api)
|
|
- [SourceMapConsumer](#sourcemapconsumer)
|
|
- [new SourceMapConsumer(rawSourceMap)](#new-sourcemapconsumerrawsourcemap)
|
|
- [SourceMapConsumer.prototype.computeColumnSpans()](#sourcemapconsumerprototypecomputecolumnspans)
|
|
- [SourceMapConsumer.prototype.originalPositionFor(generatedPosition)](#sourcemapconsumerprototypeoriginalpositionforgeneratedposition)
|
|
- [SourceMapConsumer.prototype.generatedPositionFor(originalPosition)](#sourcemapconsumerprototypegeneratedpositionfororiginalposition)
|
|
- [SourceMapConsumer.prototype.allGeneratedPositionsFor(originalPosition)](#sourcemapconsumerprototypeallgeneratedpositionsfororiginalposition)
|
|
- [SourceMapConsumer.prototype.hasContentsOfAllSources()](#sourcemapconsumerprototypehascontentsofallsources)
|
|
- [SourceMapConsumer.prototype.sourceContentFor(source[, returnNullOnMissing])](#sourcemapconsumerprototypesourcecontentforsource-returnnullonmissing)
|
|
- [SourceMapConsumer.prototype.eachMapping(callback, context, order)](#sourcemapconsumerprototypeeachmappingcallback-context-order)
|
|
- [SourceMapGenerator](#sourcemapgenerator)
|
|
- [new SourceMapGenerator([startOfSourceMap])](#new-sourcemapgeneratorstartofsourcemap)
|
|
- [SourceMapGenerator.fromSourceMap(sourceMapConsumer)](#sourcemapgeneratorfromsourcemapsourcemapconsumer)
|
|
- [SourceMapGenerator.prototype.addMapping(mapping)](#sourcemapgeneratorprototypeaddmappingmapping)
|
|
- [SourceMapGenerator.prototype.setSourceContent(sourceFile, sourceContent)](#sourcemapgeneratorprototypesetsourcecontentsourcefile-sourcecontent)
|
|
- [SourceMapGenerator.prototype.applySourceMap(sourceMapConsumer[, sourceFile[, sourceMapPath]])](#sourcemapgeneratorprototypeapplysourcemapsourcemapconsumer-sourcefile-sourcemappath)
|
|
- [SourceMapGenerator.prototype.toString()](#sourcemapgeneratorprototypetostring)
|
|
- [SourceNode](#sourcenode)
|
|
- [new SourceNode([line, column, source[, chunk[, name]]])](#new-sourcenodeline-column-source-chunk-name)
|
|
- [SourceNode.fromStringWithSourceMap(code, sourceMapConsumer[, relativePath])](#sourcenodefromstringwithsourcemapcode-sourcemapconsumer-relativepath)
|
|
- [SourceNode.prototype.add(chunk)](#sourcenodeprototypeaddchunk)
|
|
- [SourceNode.prototype.prepend(chunk)](#sourcenodeprototypeprependchunk)
|
|
- [SourceNode.prototype.setSourceContent(sourceFile, sourceContent)](#sourcenodeprototypesetsourcecontentsourcefile-sourcecontent)
|
|
- [SourceNode.prototype.walk(fn)](#sourcenodeprototypewalkfn)
|
|
- [SourceNode.prototype.walkSourceContents(fn)](#sourcenodeprototypewalksourcecontentsfn)
|
|
- [SourceNode.prototype.join(sep)](#sourcenodeprototypejoinsep)
|
|
- [SourceNode.prototype.replaceRight(pattern, replacement)](#sourcenodeprototypereplacerightpattern-replacement)
|
|
- [SourceNode.prototype.toString()](#sourcenodeprototypetostring)
|
|
- [SourceNode.prototype.toStringWithSourceMap([startOfSourceMap])](#sourcenodeprototypetostringwithsourcemapstartofsourcemap)
|
|
|
|
<!-- END doctoc generated TOC please keep comment here to allow auto update -->
|
|
|
|
## Examples
|
|
|
|
### Consuming a source map
|
|
|
|
```js
|
|
var rawSourceMap = {
|
|
version: 3,
|
|
file: 'min.js',
|
|
names: ['bar', 'baz', 'n'],
|
|
sources: ['one.js', 'two.js'],
|
|
sourceRoot: 'http://example.com/www/js/',
|
|
mappings: 'CAAC,IAAI,IAAM,SAAUA,GAClB,OAAOC,IAAID;CCDb,IAAI,IAAM,SAAUE,GAClB,OAAOA'
|
|
};
|
|
|
|
var smc = new SourceMapConsumer(rawSourceMap);
|
|
|
|
console.log(smc.sources);
|
|
// [ 'http://example.com/www/js/one.js',
|
|
// 'http://example.com/www/js/two.js' ]
|
|
|
|
console.log(smc.originalPositionFor({
|
|
line: 2,
|
|
column: 28
|
|
}));
|
|
// { source: 'http://example.com/www/js/two.js',
|
|
// line: 2,
|
|
// column: 10,
|
|
// name: 'n' }
|
|
|
|
console.log(smc.generatedPositionFor({
|
|
source: 'http://example.com/www/js/two.js',
|
|
line: 2,
|
|
column: 10
|
|
}));
|
|
// { line: 2, column: 28 }
|
|
|
|
smc.eachMapping(function (m) {
|
|
// ...
|
|
});
|
|
```
|
|
|
|
### Generating a source map
|
|
|
|
In depth guide:
|
|
[**Compiling to JavaScript, and Debugging with Source Maps**](https://hacks.mozilla.org/2013/05/compiling-to-javascript-and-debugging-with-source-maps/)
|
|
|
|
#### With SourceNode (high level API)
|
|
|
|
```js
|
|
function compile(ast) {
|
|
switch (ast.type) {
|
|
case 'BinaryExpression':
|
|
return new SourceNode(
|
|
ast.location.line,
|
|
ast.location.column,
|
|
ast.location.source,
|
|
[compile(ast.left), " + ", compile(ast.right)]
|
|
);
|
|
case 'Literal':
|
|
return new SourceNode(
|
|
ast.location.line,
|
|
ast.location.column,
|
|
ast.location.source,
|
|
String(ast.value)
|
|
);
|
|
// ...
|
|
default:
|
|
throw new Error("Bad AST");
|
|
}
|
|
}
|
|
|
|
var ast = parse("40 + 2", "add.js");
|
|
console.log(compile(ast).toStringWithSourceMap({
|
|
file: 'add.js'
|
|
}));
|
|
// { code: '40 + 2',
|
|
// map: [object SourceMapGenerator] }
|
|
```
|
|
|
|
#### With SourceMapGenerator (low level API)
|
|
|
|
```js
|
|
var map = new SourceMapGenerator({
|
|
file: "source-mapped.js"
|
|
});
|
|
|
|
map.addMapping({
|
|
generated: {
|
|
line: 10,
|
|
column: 35
|
|
},
|
|
source: "foo.js",
|
|
original: {
|
|
line: 33,
|
|
column: 2
|
|
},
|
|
name: "christopher"
|
|
});
|
|
|
|
console.log(map.toString());
|
|
// '{"version":3,"file":"source-mapped.js","sources":["foo.js"],"names":["christopher"],"mappings":";;;;;;;;;mCAgCEA"}'
|
|
```
|
|
|
|
## API
|
|
|
|
Get a reference to the module:
|
|
|
|
```js
|
|
// Node.js
|
|
var sourceMap = require('source-map');
|
|
|
|
// Browser builds
|
|
var sourceMap = window.sourceMap;
|
|
|
|
// Inside Firefox
|
|
const sourceMap = require("devtools/toolkit/sourcemap/source-map.js");
|
|
```
|
|
|
|
### SourceMapConsumer
|
|
|
|
A SourceMapConsumer instance represents a parsed source map which we can query
|
|
for information about the original file positions by giving it a file position
|
|
in the generated source.
|
|
|
|
#### new SourceMapConsumer(rawSourceMap)
|
|
|
|
The only parameter is the raw source map (either as a string which can be
|
|
`JSON.parse`'d, or an object). According to the spec, source maps have the
|
|
following attributes:
|
|
|
|
* `version`: Which version of the source map spec this map is following.
|
|
|
|
* `sources`: An array of URLs to the original source files.
|
|
|
|
* `names`: An array of identifiers which can be referenced by individual
|
|
mappings.
|
|
|
|
* `sourceRoot`: Optional. The URL root from which all sources are relative.
|
|
|
|
* `sourcesContent`: Optional. An array of contents of the original source files.
|
|
|
|
* `mappings`: A string of base64 VLQs which contain the actual mappings.
|
|
|
|
* `file`: Optional. The generated filename this source map is associated with.
|
|
|
|
```js
|
|
var consumer = new sourceMap.SourceMapConsumer(rawSourceMapJsonData);
|
|
```
|
|
|
|
#### SourceMapConsumer.prototype.computeColumnSpans()
|
|
|
|
Compute the last column for each generated mapping. The last column is
|
|
inclusive.
|
|
|
|
```js
|
|
// Before:
|
|
consumer.allGeneratedPositionsFor({ line: 2, source: "foo.coffee" })
|
|
// [ { line: 2,
|
|
// column: 1 },
|
|
// { line: 2,
|
|
// column: 10 },
|
|
// { line: 2,
|
|
// column: 20 } ]
|
|
|
|
consumer.computeColumnSpans();
|
|
|
|
// After:
|
|
consumer.allGeneratedPositionsFor({ line: 2, source: "foo.coffee" })
|
|
// [ { line: 2,
|
|
// column: 1,
|
|
// lastColumn: 9 },
|
|
// { line: 2,
|
|
// column: 10,
|
|
// lastColumn: 19 },
|
|
// { line: 2,
|
|
// column: 20,
|
|
// lastColumn: Infinity } ]
|
|
|
|
```
|
|
|
|
#### SourceMapConsumer.prototype.originalPositionFor(generatedPosition)
|
|
|
|
Returns the original source, line, and column information for the generated
|
|
source's line and column positions provided. The only argument is an object with
|
|
the following properties:
|
|
|
|
* `line`: The line number in the generated source.
|
|
|
|
* `column`: The column number in the generated source.
|
|
|
|
* `bias`: Either `SourceMapConsumer.GREATEST_LOWER_BOUND` or
|
|
`SourceMapConsumer.LEAST_UPPER_BOUND`. Specifies whether to return the closest
|
|
element that is smaller than or greater than the one we are searching for,
|
|
respectively, if the exact element cannot be found. Defaults to
|
|
`SourceMapConsumer.GREATEST_LOWER_BOUND`.
|
|
|
|
and an object is returned with the following properties:
|
|
|
|
* `source`: The original source file, or null if this information is not
|
|
available.
|
|
|
|
* `line`: The line number in the original source, or null if this information is
|
|
not available.
|
|
|
|
* `column`: The column number in the original source, or null if this
|
|
information is not available.
|
|
|
|
* `name`: The original identifier, or null if this information is not available.
|
|
|
|
```js
|
|
consumer.originalPositionFor({ line: 2, column: 10 })
|
|
// { source: 'foo.coffee',
|
|
// line: 2,
|
|
// column: 2,
|
|
// name: null }
|
|
|
|
consumer.originalPositionFor({ line: 99999999999999999, column: 999999999999999 })
|
|
// { source: null,
|
|
// line: null,
|
|
// column: null,
|
|
// name: null }
|
|
```
|
|
|
|
#### SourceMapConsumer.prototype.generatedPositionFor(originalPosition)
|
|
|
|
Returns the generated line and column information for the original source,
|
|
line, and column positions provided. The only argument is an object with
|
|
the following properties:
|
|
|
|
* `source`: The filename of the original source.
|
|
|
|
* `line`: The line number in the original source.
|
|
|
|
* `column`: The column number in the original source.
|
|
|
|
and an object is returned with the following properties:
|
|
|
|
* `line`: The line number in the generated source, or null.
|
|
|
|
* `column`: The column number in the generated source, or null.
|
|
|
|
```js
|
|
consumer.generatedPositionFor({ source: "example.js", line: 2, column: 10 })
|
|
// { line: 1,
|
|
// column: 56 }
|
|
```
|
|
|
|
#### SourceMapConsumer.prototype.allGeneratedPositionsFor(originalPosition)
|
|
|
|
Returns all generated line and column information for the original source, line,
|
|
and column provided. If no column is provided, returns all mappings
|
|
corresponding to a either the line we are searching for or the next closest line
|
|
that has any mappings. Otherwise, returns all mappings corresponding to the
|
|
given line and either the column we are searching for or the next closest column
|
|
that has any offsets.
|
|
|
|
The only argument is an object with the following properties:
|
|
|
|
* `source`: The filename of the original source.
|
|
|
|
* `line`: The line number in the original source.
|
|
|
|
* `column`: Optional. The column number in the original source.
|
|
|
|
and an array of objects is returned, each with the following properties:
|
|
|
|
* `line`: The line number in the generated source, or null.
|
|
|
|
* `column`: The column number in the generated source, or null.
|
|
|
|
```js
|
|
consumer.allGeneratedpositionsfor({ line: 2, source: "foo.coffee" })
|
|
// [ { line: 2,
|
|
// column: 1 },
|
|
// { line: 2,
|
|
// column: 10 },
|
|
// { line: 2,
|
|
// column: 20 } ]
|
|
```
|
|
|
|
#### SourceMapConsumer.prototype.hasContentsOfAllSources()
|
|
|
|
Return true if we have the embedded source content for every source listed in
|
|
the source map, false otherwise.
|
|
|
|
In other words, if this method returns `true`, then
|
|
`consumer.sourceContentFor(s)` will succeed for every source `s` in
|
|
`consumer.sources`.
|
|
|
|
```js
|
|
// ...
|
|
if (consumer.hasContentsOfAllSources()) {
|
|
consumerReadyCallback(consumer);
|
|
} else {
|
|
fetchSources(consumer, consumerReadyCallback);
|
|
}
|
|
// ...
|
|
```
|
|
|
|
#### SourceMapConsumer.prototype.sourceContentFor(source[, returnNullOnMissing])
|
|
|
|
Returns the original source content for the source provided. The only
|
|
argument is the URL of the original source file.
|
|
|
|
If the source content for the given source is not found, then an error is
|
|
thrown. Optionally, pass `true` as the second param to have `null` returned
|
|
instead.
|
|
|
|
```js
|
|
consumer.sources
|
|
// [ "my-cool-lib.clj" ]
|
|
|
|
consumer.sourceContentFor("my-cool-lib.clj")
|
|
// "..."
|
|
|
|
consumer.sourceContentFor("this is not in the source map");
|
|
// Error: "this is not in the source map" is not in the source map
|
|
|
|
consumer.sourceContentFor("this is not in the source map", true);
|
|
// null
|
|
```
|
|
|
|
#### SourceMapConsumer.prototype.eachMapping(callback, context, order)
|
|
|
|
Iterate over each mapping between an original source/line/column and a
|
|
generated line/column in this source map.
|
|
|
|
* `callback`: The function that is called with each mapping. Mappings have the
|
|
form `{ source, generatedLine, generatedColumn, originalLine, originalColumn,
|
|
name }`
|
|
|
|
* `context`: Optional. If specified, this object will be the value of `this`
|
|
every time that `callback` is called.
|
|
|
|
* `order`: Either `SourceMapConsumer.GENERATED_ORDER` or
|
|
`SourceMapConsumer.ORIGINAL_ORDER`. Specifies whether you want to iterate over
|
|
the mappings sorted by the generated file's line/column order or the
|
|
original's source/line/column order, respectively. Defaults to
|
|
`SourceMapConsumer.GENERATED_ORDER`.
|
|
|
|
```js
|
|
consumer.eachMapping(function (m) { console.log(m); })
|
|
// ...
|
|
// { source: 'illmatic.js',
|
|
// generatedLine: 1,
|
|
// generatedColumn: 0,
|
|
// originalLine: 1,
|
|
// originalColumn: 0,
|
|
// name: null }
|
|
// { source: 'illmatic.js',
|
|
// generatedLine: 2,
|
|
// generatedColumn: 0,
|
|
// originalLine: 2,
|
|
// originalColumn: 0,
|
|
// name: null }
|
|
// ...
|
|
```
|
|
### SourceMapGenerator
|
|
|
|
An instance of the SourceMapGenerator represents a source map which is being
|
|
built incrementally.
|
|
|
|
#### new SourceMapGenerator([startOfSourceMap])
|
|
|
|
You may pass an object with the following properties:
|
|
|
|
* `file`: The filename of the generated source that this source map is
|
|
associated with.
|
|
|
|
* `sourceRoot`: A root for all relative URLs in this source map.
|
|
|
|
* `skipValidation`: Optional. When `true`, disables validation of mappings as
|
|
they are added. This can improve performance but should be used with
|
|
discretion, as a last resort. Even then, one should avoid using this flag when
|
|
running tests, if possible.
|
|
|
|
```js
|
|
var generator = new sourceMap.SourceMapGenerator({
|
|
file: "my-generated-javascript-file.js",
|
|
sourceRoot: "http://example.com/app/js/"
|
|
});
|
|
```
|
|
|
|
#### SourceMapGenerator.fromSourceMap(sourceMapConsumer)
|
|
|
|
Creates a new `SourceMapGenerator` from an existing `SourceMapConsumer` instance.
|
|
|
|
* `sourceMapConsumer` The SourceMap.
|
|
|
|
```js
|
|
var generator = sourceMap.SourceMapGenerator.fromSourceMap(consumer);
|
|
```
|
|
|
|
#### SourceMapGenerator.prototype.addMapping(mapping)
|
|
|
|
Add a single mapping from original source line and column to the generated
|
|
source's line and column for this source map being created. The mapping object
|
|
should have the following properties:
|
|
|
|
* `generated`: An object with the generated line and column positions.
|
|
|
|
* `original`: An object with the original line and column positions.
|
|
|
|
* `source`: The original source file (relative to the sourceRoot).
|
|
|
|
* `name`: An optional original token name for this mapping.
|
|
|
|
```js
|
|
generator.addMapping({
|
|
source: "module-one.scm",
|
|
original: { line: 128, column: 0 },
|
|
generated: { line: 3, column: 456 }
|
|
})
|
|
```
|
|
|
|
#### SourceMapGenerator.prototype.setSourceContent(sourceFile, sourceContent)
|
|
|
|
Set the source content for an original source file.
|
|
|
|
* `sourceFile` the URL of the original source file.
|
|
|
|
* `sourceContent` the content of the source file.
|
|
|
|
```js
|
|
generator.setSourceContent("module-one.scm",
|
|
fs.readFileSync("path/to/module-one.scm"))
|
|
```
|
|
|
|
#### SourceMapGenerator.prototype.applySourceMap(sourceMapConsumer[, sourceFile[, sourceMapPath]])
|
|
|
|
Applies a SourceMap for a source file to the SourceMap.
|
|
Each mapping to the supplied source file is rewritten using the
|
|
supplied SourceMap. Note: The resolution for the resulting mappings
|
|
is the minimum of this map and the supplied map.
|
|
|
|
* `sourceMapConsumer`: The SourceMap to be applied.
|
|
|
|
* `sourceFile`: Optional. The filename of the source file.
|
|
If omitted, sourceMapConsumer.file will be used, if it exists.
|
|
Otherwise an error will be thrown.
|
|
|
|
* `sourceMapPath`: Optional. The dirname of the path to the SourceMap
|
|
to be applied. If relative, it is relative to the SourceMap.
|
|
|
|
This parameter is needed when the two SourceMaps aren't in the same
|
|
directory, and the SourceMap to be applied contains relative source
|
|
paths. If so, those relative source paths need to be rewritten
|
|
relative to the SourceMap.
|
|
|
|
If omitted, it is assumed that both SourceMaps are in the same directory,
|
|
thus not needing any rewriting. (Supplying `'.'` has the same effect.)
|
|
|
|
#### SourceMapGenerator.prototype.toString()
|
|
|
|
Renders the source map being generated to a string.
|
|
|
|
```js
|
|
generator.toString()
|
|
// '{"version":3,"sources":["module-one.scm"],"names":[],"mappings":"...snip...","file":"my-generated-javascript-file.js","sourceRoot":"http://example.com/app/js/"}'
|
|
```
|
|
|
|
### SourceNode
|
|
|
|
SourceNodes provide a way to abstract over interpolating and/or concatenating
|
|
snippets of generated JavaScript source code, while maintaining the line and
|
|
column information associated between those snippets and the original source
|
|
code. This is useful as the final intermediate representation a compiler might
|
|
use before outputting the generated JS and source map.
|
|
|
|
#### new SourceNode([line, column, source[, chunk[, name]]])
|
|
|
|
* `line`: The original line number associated with this source node, or null if
|
|
it isn't associated with an original line.
|
|
|
|
* `column`: The original column number associated with this source node, or null
|
|
if it isn't associated with an original column.
|
|
|
|
* `source`: The original source's filename; null if no filename is provided.
|
|
|
|
* `chunk`: Optional. Is immediately passed to `SourceNode.prototype.add`, see
|
|
below.
|
|
|
|
* `name`: Optional. The original identifier.
|
|
|
|
```js
|
|
var node = new SourceNode(1, 2, "a.cpp", [
|
|
new SourceNode(3, 4, "b.cpp", "extern int status;\n"),
|
|
new SourceNode(5, 6, "c.cpp", "std::string* make_string(size_t n);\n"),
|
|
new SourceNode(7, 8, "d.cpp", "int main(int argc, char** argv) {}\n"),
|
|
]);
|
|
```
|
|
|
|
#### SourceNode.fromStringWithSourceMap(code, sourceMapConsumer[, relativePath])
|
|
|
|
Creates a SourceNode from generated code and a SourceMapConsumer.
|
|
|
|
* `code`: The generated code
|
|
|
|
* `sourceMapConsumer` The SourceMap for the generated code
|
|
|
|
* `relativePath` The optional path that relative sources in `sourceMapConsumer`
|
|
should be relative to.
|
|
|
|
```js
|
|
var consumer = new SourceMapConsumer(fs.readFileSync("path/to/my-file.js.map", "utf8"));
|
|
var node = SourceNode.fromStringWithSourceMap(fs.readFileSync("path/to/my-file.js"),
|
|
consumer);
|
|
```
|
|
|
|
#### SourceNode.prototype.add(chunk)
|
|
|
|
Add a chunk of generated JS to this source node.
|
|
|
|
* `chunk`: A string snippet of generated JS code, another instance of
|
|
`SourceNode`, or an array where each member is one of those things.
|
|
|
|
```js
|
|
node.add(" + ");
|
|
node.add(otherNode);
|
|
node.add([leftHandOperandNode, " + ", rightHandOperandNode]);
|
|
```
|
|
|
|
#### SourceNode.prototype.prepend(chunk)
|
|
|
|
Prepend a chunk of generated JS to this source node.
|
|
|
|
* `chunk`: A string snippet of generated JS code, another instance of
|
|
`SourceNode`, or an array where each member is one of those things.
|
|
|
|
```js
|
|
node.prepend("/** Build Id: f783haef86324gf **/\n\n");
|
|
```
|
|
|
|
#### SourceNode.prototype.setSourceContent(sourceFile, sourceContent)
|
|
|
|
Set the source content for a source file. This will be added to the
|
|
`SourceMap` in the `sourcesContent` field.
|
|
|
|
* `sourceFile`: The filename of the source file
|
|
|
|
* `sourceContent`: The content of the source file
|
|
|
|
```js
|
|
node.setSourceContent("module-one.scm",
|
|
fs.readFileSync("path/to/module-one.scm"))
|
|
```
|
|
|
|
#### SourceNode.prototype.walk(fn)
|
|
|
|
Walk over the tree of JS snippets in this node and its children. The walking
|
|
function is called once for each snippet of JS and is passed that snippet and
|
|
the its original associated source's line/column location.
|
|
|
|
* `fn`: The traversal function.
|
|
|
|
```js
|
|
var node = new SourceNode(1, 2, "a.js", [
|
|
new SourceNode(3, 4, "b.js", "uno"),
|
|
"dos",
|
|
[
|
|
"tres",
|
|
new SourceNode(5, 6, "c.js", "quatro")
|
|
]
|
|
]);
|
|
|
|
node.walk(function (code, loc) { console.log("WALK:", code, loc); })
|
|
// WALK: uno { source: 'b.js', line: 3, column: 4, name: null }
|
|
// WALK: dos { source: 'a.js', line: 1, column: 2, name: null }
|
|
// WALK: tres { source: 'a.js', line: 1, column: 2, name: null }
|
|
// WALK: quatro { source: 'c.js', line: 5, column: 6, name: null }
|
|
```
|
|
|
|
#### SourceNode.prototype.walkSourceContents(fn)
|
|
|
|
Walk over the tree of SourceNodes. The walking function is called for each
|
|
source file content and is passed the filename and source content.
|
|
|
|
* `fn`: The traversal function.
|
|
|
|
```js
|
|
var a = new SourceNode(1, 2, "a.js", "generated from a");
|
|
a.setSourceContent("a.js", "original a");
|
|
var b = new SourceNode(1, 2, "b.js", "generated from b");
|
|
b.setSourceContent("b.js", "original b");
|
|
var c = new SourceNode(1, 2, "c.js", "generated from c");
|
|
c.setSourceContent("c.js", "original c");
|
|
|
|
var node = new SourceNode(null, null, null, [a, b, c]);
|
|
node.walkSourceContents(function (source, contents) { console.log("WALK:", source, ":", contents); })
|
|
// WALK: a.js : original a
|
|
// WALK: b.js : original b
|
|
// WALK: c.js : original c
|
|
```
|
|
|
|
#### SourceNode.prototype.join(sep)
|
|
|
|
Like `Array.prototype.join` except for SourceNodes. Inserts the separator
|
|
between each of this source node's children.
|
|
|
|
* `sep`: The separator.
|
|
|
|
```js
|
|
var lhs = new SourceNode(1, 2, "a.rs", "my_copy");
|
|
var operand = new SourceNode(3, 4, "a.rs", "=");
|
|
var rhs = new SourceNode(5, 6, "a.rs", "orig.clone()");
|
|
|
|
var node = new SourceNode(null, null, null, [ lhs, operand, rhs ]);
|
|
var joinedNode = node.join(" ");
|
|
```
|
|
|
|
#### SourceNode.prototype.replaceRight(pattern, replacement)
|
|
|
|
Call `String.prototype.replace` on the very right-most source snippet. Useful
|
|
for trimming white space from the end of a source node, etc.
|
|
|
|
* `pattern`: The pattern to replace.
|
|
|
|
* `replacement`: The thing to replace the pattern with.
|
|
|
|
```js
|
|
// Trim trailing white space.
|
|
node.replaceRight(/\s*$/, "");
|
|
```
|
|
|
|
#### SourceNode.prototype.toString()
|
|
|
|
Return the string representation of this source node. Walks over the tree and
|
|
concatenates all the various snippets together to one string.
|
|
|
|
```js
|
|
var node = new SourceNode(1, 2, "a.js", [
|
|
new SourceNode(3, 4, "b.js", "uno"),
|
|
"dos",
|
|
[
|
|
"tres",
|
|
new SourceNode(5, 6, "c.js", "quatro")
|
|
]
|
|
]);
|
|
|
|
node.toString()
|
|
// 'unodostresquatro'
|
|
```
|
|
|
|
#### SourceNode.prototype.toStringWithSourceMap([startOfSourceMap])
|
|
|
|
Returns the string representation of this tree of source nodes, plus a
|
|
SourceMapGenerator which contains all the mappings between the generated and
|
|
original sources.
|
|
|
|
The arguments are the same as those to `new SourceMapGenerator`.
|
|
|
|
```js
|
|
var node = new SourceNode(1, 2, "a.js", [
|
|
new SourceNode(3, 4, "b.js", "uno"),
|
|
"dos",
|
|
[
|
|
"tres",
|
|
new SourceNode(5, 6, "c.js", "quatro")
|
|
]
|
|
]);
|
|
|
|
node.toStringWithSourceMap({ file: "my-output-file.js" })
|
|
// { code: 'unodostresquatro',
|
|
// map: [object SourceMapGenerator] }
|
|
```
|