Adds some docs for how a formatter works#32072
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andrewbranch
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Jun 24, 2019
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| ### Where is this used? | ||
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| The formatter is used mainly from the language service for formatting with an editor, but [services/textChanges.ts](/src/services/textChanges.ts) also uses this formatter when emitting code for quick fixes. |
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AFAIK this is essentially “any language service operation that inserts or modifies code”
| ```ts | ||
| const nonFormattedText = `[js source code]`; | ||
| const sourceFile = createSourceFile("any file name", nonFormattedText, ScriptTarget.ESNext, /*setParentNodes*/ true, ScriptKind.JS); | ||
| const changes = formatting.formatDocument(sourceFile, formatContext); |
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Not sure if this is realistic since everything happens internally within the language service itself 🤔
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yeah, might just kill the section
| As it recurses, `processNode` is called on the children setting the indentation is decided and passed | ||
| through into each of that node's children. | ||
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| The meat of formatting decisions is made via `processPair`, the pair here being the current node and the previous node. `processPair` which mutates the formatting context to represent the current place in the scanner and requests a set of rules which can be applied to the items via `createRulesMap`. |
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This paragraph and the next are probably the most important bits
Co-Authored-By: Andrew Branch <andrewbranch@users.noreply.github.com>
Co-Authored-By: Andrew Branch <andrewbranch@users.noreply.github.com>
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Cool, thanks, will merge on green |
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I've been reading the code on how the formatter works, and given an overall summary in the README docs
@andrewbranch - you were the most recent person to touch these, so I figure you might be a reasonable reviewer