Source file src/github.com/vektah/gqlparser/v2/lexer/blockstring.go

Documentation: github.com/vektah/gqlparser/v2/lexer

     1  package lexer
     2  
     3  import (
     4  	"math"
     5  	"strings"
     6  )
     7  
     8  // blockStringValue produces the value of a block string from its parsed raw value, similar to
     9  // Coffeescript's block string, Python's docstring trim or Ruby's strip_heredoc.
    10  //
    11  // This implements the GraphQL spec's BlockStringValue() static algorithm.
    12  func blockStringValue(raw string) string {
    13  	lines := strings.Split(raw, "\n")
    14  
    15  	commonIndent := math.MaxInt32
    16  	for _, line := range lines {
    17  		indent := leadingWhitespace(line)
    18  		if indent < len(line) && indent < commonIndent {
    19  			commonIndent = indent
    20  			if commonIndent == 0 {
    21  				break
    22  			}
    23  		}
    24  	}
    25  
    26  	if commonIndent != math.MaxInt32 && len(lines) > 0 {
    27  		for i := 1; i < len(lines); i++ {
    28  			if len(lines[i]) < commonIndent {
    29  				lines[i] = ""
    30  			} else {
    31  				lines[i] = lines[i][commonIndent:]
    32  			}
    33  		}
    34  	}
    35  
    36  	start := 0
    37  	end := len(lines)
    38  
    39  	for start < end && leadingWhitespace(lines[start]) == math.MaxInt32 {
    40  		start++
    41  	}
    42  
    43  	for start < end && leadingWhitespace(lines[end-1]) == math.MaxInt32 {
    44  		end--
    45  	}
    46  
    47  	return strings.Join(lines[start:end], "\n")
    48  }
    49  
    50  func leadingWhitespace(str string) int {
    51  	for i, r := range str {
    52  		if r != ' ' && r != '\t' {
    53  			return i
    54  		}
    55  	}
    56  	// this line is made up entirely of whitespace, its leading whitespace doesnt count.
    57  	return math.MaxInt32
    58  }
    59  

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