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104 lines
2.9 KiB
Go
104 lines
2.9 KiB
Go
// MIT License
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//
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// Copyright (c) 2019 GraphQL Contributors
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//
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// Permission is hereby granted, free of charge, to any person obtaining a copy
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// of this software and associated documentation files (the "Software"), to deal
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// in the Software without restriction, including without limitation the rights
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// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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// copies of the Software, and to permit persons to whom the Software is
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// furnished to do so, subject to the following conditions:
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//
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// The above copyright notice and this permission notice shall be included in all
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// copies or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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// SOFTWARE.
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//
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// This implementation has been adapted from the graphql-js reference implementation
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// https://github.com/graphql/graphql-js/blob/5eb7c4ded7ceb83ac742149cbe0dae07a8af9a30/src/language/blockString.js
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// which is released under the MIT License above.
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package common
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import (
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"strings"
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)
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// Produces the value of a block string from its parsed raw value, similar to
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// CoffeeScript's block string, Python's docstring trim or Ruby's strip_heredoc.
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//
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// This implements the GraphQL spec's BlockStringValue() static algorithm.
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func blockString(raw string) string {
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lines := strings.Split(raw, "\n")
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// Remove common indentation from all lines except the first (which has none)
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ind := blockStringIndentation(lines)
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if ind > 0 {
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for i := 1; i < len(lines); i++ {
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l := lines[i]
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if len(l) < ind {
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lines[i] = ""
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continue
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}
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lines[i] = l[ind:]
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}
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}
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// Remove leading and trailing blank lines
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trimStart := 0
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for i := 0; i < len(lines) && isBlank(lines[i]); i++ {
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trimStart++
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}
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lines = lines[trimStart:]
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trimEnd := 0
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for i := len(lines) - 1; i > 0 && isBlank(lines[i]); i-- {
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trimEnd++
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}
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lines = lines[:len(lines)-trimEnd]
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return strings.Join(lines, "\n")
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}
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func blockStringIndentation(lines []string) int {
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var commonIndent *int
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for i := 1; i < len(lines); i++ {
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l := lines[i]
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indent := leadingWhitespace(l)
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if indent == len(l) {
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// don't consider blank/empty lines
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continue
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}
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if indent == 0 {
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return 0
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}
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if commonIndent == nil || indent < *commonIndent {
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commonIndent = &indent
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}
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}
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if commonIndent == nil {
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return 0
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}
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return *commonIndent
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}
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func isBlank(s string) bool {
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return len(s) == 0 || leadingWhitespace(s) == len(s)
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}
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func leadingWhitespace(s string) int {
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i := 0
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for _, r := range s {
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if r != '\t' && r != ' ' {
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break
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}
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i++
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}
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return i
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}
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