textlint-util-to-string
Convert Paragraph
Node to plain text with SourceMap.
It means that you can get original position from plain text.
This library is for textlint and textstat.
Installation
npm install textlint-util-to-string
Terminology
The concepts position
and index
are the same with TxtAST Interface and textlint/structured-source.
position
is a { line, column }
object.
- The
column
property of position
is 0-based. - The
line
property of position
is 1-based.
index
is an offset number.
- The
index
property is 0-based.
API
new StringSource(node: TxtParentNode, options?: StringSourceOptions)
Create new StringSource
instance for paragraph
Node.
toString(): string
Get plain text from Paragraph
Node.
This plain text is concatenated from value
of all children nodes of Paragraph
Node.
import { StringSource } from "textlint-util-to-string";
const report = function (context) {
const { Syntax, report, RuleError } = context;
return {
[Syntax.Paragraph](node) {
const source = new StringSource(node);
const text = source.toString();
}
}
};
In some cases, you may want to replace some characters in the plain text for avoiding false positives.
You can replace value
of children nodes by options.replacer
.
options.replacer
is a function that takes a node
and commands like maskValue
or emptyValue
.
If you want to modify the value
of the node, return command function calls.
const source = new StringSource(paragraphNode, {
replacer({ node, maskValue }) {
if (node.type === Syntax.Code) {
return maskValue("_");
}
}
});
console.log(source.toString());
maskValue(character: string)
: mask the value
of the node with the given character
.emptyValue()
: replace the value
of the node with an empty string.
originalIndexFromIndex(generatedIndex): number | undefined
Get original index from generated index value
originalPositionFromPosition(position): Position | undefined
Get original position from generated position
originalIndexFromPosition(generatedPosition): number | undefined
Get original index from generated position
originalPositionFromIndex(generatedIndex): Position | undefined
Get original position from generated index
Examples
Create plain text from Paragraph
Node and get original position from plain text.
import assert from "assert";
import { StringSource } from "textlint-util-to-string";
const report = function (context) {
const { Syntax, report, RuleError } = context;
return {
[Syntax.Paragraph](node) {
const source = new StringSource(node);
const text = source.toString();
const index1 = result.indexOf("Example");
assert.strictEqual(index1, 8);
assert.strictEqual(source.originalIndexFromIndex(index1), 9);
assert.deepStrictEqual(source.originalPositionFromPosition({
line: 1,
column: 8
}), {
line: 1,
column: 9
});
const index2 = result.indexOf("!?");
assert.strictEqual(index2, 15);
assert.strictEqual(source.originalIndexFromIndex(index2), 16);
}
}
};
Examples
FAQ
Why return relative position from rootNode?
const AST = {...}
const rootNode = AST.children[10];
const source = new StringSource(rootNode);
source.originalIndexFor(0);
To return relative position easy to compute position(We think).
One space has a single absolute position, The other should be relative position.
Tests
npm test
Contributing
- Fork it!
- Create your feature branch:
git checkout -b my-new-feature
- Commit your changes:
git commit -am 'Add some feature'
- Push to the branch:
git push origin my-new-feature
- Submit a pull request :D
License
MIT