1 files changed, 58 insertions, 0 deletions
diff --git a/vendor/github.com/vektah/gqlparser/lexer/blockstring.go b/vendor/github.com/vektah/gqlparser/lexer/blockstring.go
new file mode 100644
index 00000000..4065a610
--- /dev/null
+++ b/vendor/github.com/vektah/gqlparser/lexer/blockstring.go
@@ -0,0 +1,58 @@
+package lexer
+
+import (
+	"math"
+	"strings"
+)
+
+// blockStringValue produces the value of a block string from its parsed raw value, similar to
+// Coffeescript's block string, Python's docstring trim or Ruby's strip_heredoc.
+//
+// This implements the GraphQL spec's BlockStringValue() static algorithm.
+func blockStringValue(raw string) string {
+	lines := strings.Split(raw, "\n")
+
+	commonIndent := math.MaxInt32
+	for _, line := range lines {
+		indent := leadingWhitespace(line)
+		if indent < len(line) && indent < commonIndent {
+			commonIndent = indent
+			if commonIndent == 0 {
+				break
+			}
+		}
+	}
+
+	if commonIndent != math.MaxInt32 && len(lines) > 0 {
+		for i := 1; i < len(lines); i++ {
+			if len(lines[i]) < commonIndent {
+				lines[i] = ""
+			} else {
+				lines[i] = lines[i][commonIndent:]
+			}
+		}
+	}
+
+	start := 0
+	end := len(lines)
+
+	for start < end && leadingWhitespace(lines[start]) == math.MaxInt32 {
+		start++
+	}
+
+	for start < end && leadingWhitespace(lines[end-1]) == math.MaxInt32 {
+		end--
+	}
+
+	return strings.Join(lines[start:end], "\n")
+}
+
+func leadingWhitespace(str string) int {
+	for i, r := range str {
+		if r != ' ' && r != '\t' {
+			return i
+		}
+	}
+	// this line is made up entirely of whitespace, its leading whitespace doesnt count.
+	return math.MaxInt32
+}