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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
}
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