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123 lines
3.4 KiB
TypeScript
123 lines
3.4 KiB
TypeScript
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// Loaded from https://deno.land/x/graphql_deno@v15.0.0/lib/utilities/stripIgnoredCharacters.js
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import inspect from '../jsutils/inspect.js';
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import { Source } from '../language/source.js';
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import { TokenKind } from '../language/tokenKind.js';
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import { Lexer, isPunctuatorTokenKind } from '../language/lexer.js';
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import { dedentBlockStringValue, getBlockStringIndentation } from '../language/blockString.js';
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/**
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* Strips characters that are not significant to the validity or execution
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* of a GraphQL document:
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* - UnicodeBOM
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* - WhiteSpace
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* - LineTerminator
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* - Comment
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* - Comma
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* - BlockString indentation
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*
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* Note: It is required to have a delimiter character between neighboring
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* non-punctuator tokens and this function always uses single space as delimiter.
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*
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* It is guaranteed that both input and output documents if parsed would result
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* in the exact same AST except for nodes location.
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*
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* Warning: It is guaranteed that this function will always produce stable results.
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* However, it's not guaranteed that it will stay the same between different
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* releases due to bugfixes or changes in the GraphQL specification.
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*
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* Query example:
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*
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* query SomeQuery($foo: String!, $bar: String) {
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* someField(foo: $foo, bar: $bar) {
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* a
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* b {
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* c
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* d
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* }
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* }
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* }
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*
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* Becomes:
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*
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* query SomeQuery($foo:String!$bar:String){someField(foo:$foo bar:$bar){a b{c d}}}
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*
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* SDL example:
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*
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* """
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* Type description
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* """
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* type Foo {
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* """
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* Field description
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* """
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* bar: String
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* }
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*
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* Becomes:
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*
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* """Type description""" type Foo{"""Field description""" bar:String}
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*/
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export function stripIgnoredCharacters(source) {
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const sourceObj = typeof source === 'string' ? new Source(source) : source;
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if (!(sourceObj instanceof Source)) {
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throw new TypeError(`Must provide string or Source. Received: ${inspect(sourceObj)}.`);
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}
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const body = sourceObj.body;
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const lexer = new Lexer(sourceObj);
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let strippedBody = '';
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let wasLastAddedTokenNonPunctuator = false;
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while (lexer.advance().kind !== TokenKind.EOF) {
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const currentToken = lexer.token;
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const tokenKind = currentToken.kind;
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/**
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* Every two non-punctuator tokens should have space between them.
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* Also prevent case of non-punctuator token following by spread resulting
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* in invalid token (e.g. `1...` is invalid Float token).
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*/
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const isNonPunctuator = !isPunctuatorTokenKind(currentToken.kind);
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if (wasLastAddedTokenNonPunctuator) {
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if (isNonPunctuator || currentToken.kind === TokenKind.SPREAD) {
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strippedBody += ' ';
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}
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}
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const tokenBody = body.slice(currentToken.start, currentToken.end);
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if (tokenKind === TokenKind.BLOCK_STRING) {
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strippedBody += dedentBlockString(tokenBody);
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} else {
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strippedBody += tokenBody;
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}
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wasLastAddedTokenNonPunctuator = isNonPunctuator;
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}
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return strippedBody;
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}
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function dedentBlockString(blockStr) {
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// skip leading and trailing triple quotations
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const rawStr = blockStr.slice(3, -3);
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let body = dedentBlockStringValue(rawStr);
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const lines = body.split(/\r\n|[\n\r]/g);
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if (getBlockStringIndentation(lines) > 0) {
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body = '\n' + body;
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}
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const lastChar = body[body.length - 1];
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const hasTrailingQuote = lastChar === '"' && body.slice(-4) !== '\\"""';
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if (hasTrailingQuote || lastChar === '\\') {
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body += '\n';
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}
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return '"""' + body + '"""';
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}
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