| import { printBlockString } from '../language/blockString.mjs'; |
| import { isPunctuatorTokenKind, Lexer } from '../language/lexer.mjs'; |
| import { isSource, Source } from '../language/source.mjs'; |
| import { TokenKind } from '../language/tokenKind.mjs'; |
| /** |
| * Strips characters that are not significant to the validity or execution |
| * of a GraphQL document: |
| * - UnicodeBOM |
| * - WhiteSpace |
| * - LineTerminator |
| * - Comment |
| * - Comma |
| * - BlockString indentation |
| * |
| * Note: It is required to have a delimiter character between neighboring |
| * non-punctuator tokens and this function always uses single space as delimiter. |
| * |
| * It is guaranteed that both input and output documents if parsed would result |
| * in the exact same AST except for nodes location. |
| * |
| * Warning: It is guaranteed that this function will always produce stable results. |
| * However, it's not guaranteed that it will stay the same between different |
| * releases due to bugfixes or changes in the GraphQL specification. |
| * |
| * Query example: |
| * |
| * ```graphql |
| * query SomeQuery($foo: String!, $bar: String) { |
| * someField(foo: $foo, bar: $bar) { |
| * a |
| * b { |
| * c |
| * d |
| * } |
| * } |
| * } |
| * ``` |
| * |
| * Becomes: |
| * |
| * ```graphql |
| * query SomeQuery($foo:String!$bar:String){someField(foo:$foo bar:$bar){a b{c d}}} |
| * ``` |
| * |
| * SDL example: |
| * |
| * ```graphql |
| * """ |
| * Type description |
| * """ |
| * type Foo { |
| * """ |
| * Field description |
| * """ |
| * bar: String |
| * } |
| * ``` |
| * |
| * Becomes: |
| * |
| * ```graphql |
| * """Type description""" type Foo{"""Field description""" bar:String} |
| * ``` |
| */ |
| |
| export function stripIgnoredCharacters(source) { |
| const sourceObj = isSource(source) ? source : new Source(source); |
| const body = sourceObj.body; |
| const lexer = new Lexer(sourceObj); |
| let strippedBody = ''; |
| let wasLastAddedTokenNonPunctuator = false; |
| |
| while (lexer.advance().kind !== TokenKind.EOF) { |
| const currentToken = lexer.token; |
| const tokenKind = currentToken.kind; |
| /** |
| * Every two non-punctuator tokens should have space between them. |
| * Also prevent case of non-punctuator token following by spread resulting |
| * in invalid token (e.g. `1...` is invalid Float token). |
| */ |
| |
| const isNonPunctuator = !isPunctuatorTokenKind(currentToken.kind); |
| |
| if (wasLastAddedTokenNonPunctuator) { |
| if (isNonPunctuator || currentToken.kind === TokenKind.SPREAD) { |
| strippedBody += ' '; |
| } |
| } |
| |
| const tokenBody = body.slice(currentToken.start, currentToken.end); |
| |
| if (tokenKind === TokenKind.BLOCK_STRING) { |
| strippedBody += printBlockString(currentToken.value, { |
| minimize: true, |
| }); |
| } else { |
| strippedBody += tokenBody; |
| } |
| |
| wasLastAddedTokenNonPunctuator = isNonPunctuator; |
| } |
| |
| return strippedBody; |
| } |