chiles
v0.1.3
Published
esprima wrapper to manipulate javascript files
Downloads
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Readme
Chiles
Wrapper around esprima to modify javascript documents.
example
Modify inline comments and add content before each comment.
const _ = require('lodash');
const chiles = require('../dist/chiles.js');
const src = `
//i1
function abc(a, b) {
//i2
}
//i3
`;
const doc = chiles(src);
console.log(doc.repr());
console.log(doc.toString());
const newNodes = [];
doc.walkPostOrder(n => {
if (n.type === 'Line') {
doc.update('\n', n.range[0], n.range[0], null);
newNodes.push(doc.insert(`// ADDED: ${n.value}`, n.range[0] - 1));
n.setSource(`// -> (${n.value})`);
}
});
console.log(doc.repr());
console.log(doc.toString());
_.each(newNodes, n => {
console.log([n.getSource()]);
});
output:
[0 - 41]: Document
[0 - 41]: Program
[1 - 5]: Line
[6 - 35]: FunctionDeclaration
[15 - 18]: Identifier
[19 - 20]: Identifier
[22 - 23]: Identifier
[25 - 35]: BlockStatement
[29 - 33]: Line
[36 - 40]: Line
//i1
function abc(a, b) {
//i2
}
//i3
[0 - 98]: Document
[0 - 98]: Program
[1 - 13]: _Unknown
[14 - 24]: Line
[25 - 73]: FunctionDeclaration
[34 - 37]: Identifier
[38 - 39]: Identifier
[41 - 42]: Identifier
[44 - 73]: BlockStatement
[48 - 60]: _Unknown
[61 - 71]: Line
[74 - 86]: _Unknown
[87 - 97]: Line
// ADDED: i1
// -> (i1)
function abc(a, b) {
// ADDED: i2
// -> (i2)
}
// ADDED: i3
// -> (i3)
[ '// ADDED: i1' ]
[ '// ADDED: i2' ]
[ '// ADDED: i3' ]
methods
const chiles = require('chiles');
chiles(src)
Parse the string source src
with esprima, returns a single Document
object which can
be used to modify the original source.
Document
A document object has the following methods:
str(start, end)
: returns a substring from the source with the specified endpoints.
repr()
: Utility function displaying all the ranges and the node types for the document.
walkPostOrder(fn)
: Walks through the document and executes the function fn
on a node only
after all its children have been visited. The function fn
takes in paramters node
and level
.
insert(text, start, type = 'Unknown')
: Inserts the text text
at the index spefied by start
.
We may optionally specified the type of node that corresponds to the inserted text.
update(text, start, end, type = 'Unknown')
: Replace a substring from the source with the specified
text. Usually useful when modifying a piece of text that has not yet been claimed by a node.
WARNING: At the moment there is no checks to make sure that the range we are modifying does not belong to another node.
toString()
: Obtain the current document as a string.
nodes
Each node in a Document has the following properties:
_prev
:
_next
:
_child
:
_parent
:
_owner
:
setSource
:
getSource
:
install
With npm:
npm install chiles