encoding:
  - name: disallows uncommon control characters
    input: "\u0007"
    error:
      message: 'Cannot contain the invalid character "\u0007"'
      locations: [{line: 1, column: 1}]

  - name: accepts BOM header
    input: "\uFEFF foo"
    tokens:
      -
        kind: NAME
        start: 2
        end: 5
        value: 'foo'

simple tokens:
  - name: records line and column
    input: "\n \r\n \r  foo\n"
    tokens:
      -
        kind: NAME
        start: 8
        end: 11
        line: 4
        column: 3
        value: 'foo'

  - name: skips whitespace
    input: "\n\n    foo\n\n\n"
    tokens:
      -
        kind: NAME
        start: 6
        end: 9
        value: 'foo'

  - name: skips comments
    input: "\n    #comment\n    foo#comment\n"
    tokens:
      -
        kind: NAME
        start: 18
        end: 21
        value: 'foo'

  - name: skips commas
    input: ",,,foo,,,"
    tokens:
      -
        kind: NAME
        start: 3
        end: 6
        value: 'foo'

  - name: errors respect whitespace
    input: "\n\n    ?\n\n\n"
    error:
      message: 'Cannot parse the unexpected character "?".'
      locations: [{line: 3, column: 5}]
      string: |
        Syntax Error: Cannot parse the unexpected character "?".
        GraphQL request (3:5)
        2:
        3:     ?
               ^
        4:

  - name: lex reports useful information for dashes in names
    input: "a-b"
    error:
      message: 'Invalid number, expected digit but got: "b".'
      locations: [{ line: 1, column: 3 }]
    tokens:
      -
        kind: Name
        start: 0
        end: 1
        value: a

lexes strings:
  - name: basic
    input: '"simple"'
    tokens:
      -
        kind: STRING
        start: 0
        end: 8
        value: 'simple'

  - name: whitespace
    input: '" white space "'
    tokens:
      -
        kind: STRING
        start: 0
        end: 15
        value: ' white space '

  - name: quote
    input: '"quote \""'
    tokens:
      -
        kind: STRING
        start: 0
        end: 10
        value: 'quote "'

  - name: escaped
    input: '"escaped \n\r\b\t\f"'
    tokens:
      -
        kind: STRING
        start: 0
        end: 20
        value: "escaped \n\r\b\t\f"

  - name: slashes
    input: '"slashes \\ \/"'
    tokens:
      -
        kind: STRING
        start: 0
        end: 15
        value: 'slashes \ /'

  - name: unicode
    input: '"unicode \u1234\u5678\u90AB\uCDEF"'
    tokens:
      -
        kind: STRING
        start: 0
        end: 34
        value: "unicode \u1234\u5678\u90AB\uCDEF"

lex reports useful string errors:
  - name: unterminated
    input: '"'
    error:
      message: "Unterminated string."
      locations: [{ line: 1, column: 2 }]

  - name: no end quote
    input: '"no end quote'
    error:
      message: 'Unterminated string.'
      locations: [{ line: 1, column: 14 }]

  - name: single quotes
    input: "'single quotes'"
    error:
      message: "Unexpected single quote character ('), did you mean to use a double quote (\")?"
      locations: [{ line: 1, column: 1 }]

  - name: control characters
    input: "\"contains unescaped \u0007 control char\""
    error:
      message: 'Invalid character within String: "\u0007".'
      locations: [{ line: 1, column: 21 }]

  - name: null byte
    input: "\"null-byte is not \u0000 end of file\""
    error:
      message: 'Invalid character within String: "\u0000".'
      locations: [{ line: 1, column: 19 }]

  - name: unterminated newline
    input: "\"multi\nline\""
    error:
      message: 'Unterminated string.'
      locations: [{line: 1, column: 7 }]

  - name: unterminated carriage return
    input: "\"multi\rline\""
    error:
      message: 'Unterminated string.'
      locations: [{ line: 1, column: 7 }]

  - name: bad escape character
    input: '"bad \z esc"'
    error:
      message: 'Invalid character escape sequence: \z.'
      locations: [{ line: 1, column: 7 }]

  - name: hex escape sequence
    input: '"bad \x esc"'
    error:
      message: 'Invalid character escape sequence: \x.'
      locations: [{ line: 1, column: 7 }]

  - name: short escape sequence
    input: '"bad \u1 esc"'
    error:
      message: 'Invalid character escape sequence: \u1 es.'
      locations: [{ line: 1, column: 7 }]

  - name: invalid escape sequence 1
    input: '"bad \u0XX1 esc"'
    error:
      message: 'Invalid character escape sequence: \u0XX1.'
      locations: [{ line: 1, column: 7 }]

  - name: invalid escape sequence 2
    input: '"bad \uXXXX esc"'
    error:
      message: 'Invalid character escape sequence: \uXXXX.'
      locations: [{ line: 1, column: 7 }]

  - name: invalid escape sequence 3
    input: '"bad \uFXXX esc"'
    error:
      message: 'Invalid character escape sequence: \uFXXX.'
      locations: [{ line: 1, column: 7 }]

  - name: invalid character escape sequence
    input: '"bad \uXXXF esc"'
    error:
      message: 'Invalid character escape sequence: \uXXXF.'
      locations: [{ line: 1, column: 7 }]

lexes block strings:
  - name: simple
    input: '"""simple"""'
    tokens:
      -
        kind: BLOCK_STRING
        start: 0
        end: 12
        value: 'simple'

  - name: white space
    input: '""" white space """'
    tokens:
      -
        kind: BLOCK_STRING
        start: 0
        end: 19
        value: ' white space '

  - name: contains quote
    input: '"""contains " quote"""'
    tokens:
      -
        kind: BLOCK_STRING
        start: 0
        end: 22
        value: 'contains " quote'

  - name: contains triplequote
    input: "\"\"\"contains \\\"\"\" triplequote\"\"\""
    tokens:
      -
        kind: BLOCK_STRING
        start: 0
        end: 31
        value: 'contains """ triplequote'

  - name: multi line
    input: "\"\"\"multi\nline\"\"\""
    tokens:
      -
        kind: BLOCK_STRING
        start: 0
        end: 16
        value: "multi\nline"

  - name: multi line normalized
    input: "\"\"\"multi\rline\r\nnormalized\"\"\""
    tokens:
      -
        kind: BLOCK_STRING
        start: 0
        end: 28
        value: "multi\nline\nnormalized"

  - name: unescaped
    input: '"""unescaped \n\r\b\t\f\u1234"""'
    tokens:
      -
        kind: BLOCK_STRING
        start: 0
        end: 32
        value: 'unescaped \n\r\b\t\f\u1234'

  - name: slashes
    input: '"""slashes \\ \/"""'
    tokens:
      -
        kind: BLOCK_STRING
        start: 0
        end: 19
        value: 'slashes \\ \/'

  - name: multiple lines
    input: |
      """

      spans
        multiple
          lines

      """
    tokens:
      -
        kind: BLOCK_STRING
        start: 0
        end: 36
        value: "spans\n  multiple\n    lines"

lex reports useful block string errors:
  - name: unterminated string
    input: '"""'
    error:
      message: "Unterminated string."
      locations: [{ line: 1, column: 4 }]

  - name: unescaped control characters
    input: "\"\"\"contains unescaped \u0007 control char\"\"\""
    error:
      message: 'Invalid character within String: "\u0007".'
      locations: [{ line: 1, column: 23 }]

  - name: null byte
    input: "\"\"\"null-byte is not \u0000 end of file\"\"\""
    error:
      message: 'Invalid character within String: "\u0000".'
      locations: [{ line: 1, column: 21 }]

lexes numbers:
  - name: integer
    input: "4"
    tokens:
      -
        kind: INT
        start: 0
        end: 1
        value: '4'

  - name: float
    input: "4.123"
    tokens:
      -
        kind: FLOAT
        start: 0
        end: 5
        value: '4.123'

  - name: negative
    input: "-4"
    tokens:
      -
        kind: INT
        start: 0
        end: 2
        value: '-4'

  - name: nine
    input: "9"
    tokens:
      -
        kind: INT
        start: 0
        end: 1
        value: '9'

  - name: zero
    input: "0"
    tokens:
      -
        kind: INT
        start: 0
        end: 1
        value: '0'

  - name: negative float
    input: "-4.123"
    tokens:
      -
        kind: FLOAT
        start: 0
        end: 6
        value: '-4.123'

  - name: float leading zero
    input: "0.123"
    tokens:
      -
        kind: FLOAT
        start: 0
        end: 5
        value: '0.123'

  - name: exponent whole
    input: "123e4"
    tokens:
      -
        kind: FLOAT
        start: 0
        end: 5
        value: '123e4'

  - name: exponent uppercase
    input: "123E4"
    tokens:
      -
        kind: FLOAT
        start: 0
        end: 5
        value: '123E4'

  - name: exponent negative power
    input: "123e-4"
    tokens:
      -
        kind: FLOAT
        start: 0
        end: 6
        value: '123e-4'

  - name: exponent positive power
    input: "123e+4"
    tokens:
      -
        kind: FLOAT
        start: 0
        end: 6
        value: '123e+4'

  - name: exponent negative base
    input: "-1.123e4"
    tokens:
      -
        kind: FLOAT
        start: 0
        end: 8
        value: '-1.123e4'

  - name: exponent negative base upper
    input: "-1.123E4"
    tokens:
      -
        kind: FLOAT
        start: 0
        end: 8
        value: '-1.123E4'

  - name: exponent negative base negative power
    input: "-1.123e-4"
    tokens:
      -
        kind: FLOAT
        start: 0
        end: 9
        value: '-1.123e-4'

  - name: exponent negative base positive power
    input: "-1.123e+4"
    tokens:
      -
        kind: FLOAT
        start: 0
        end: 9
        value: '-1.123e+4'

  - name: exponent negative base large power
    input: "-1.123e4567"
    tokens:
      -
        kind: FLOAT
        start: 0
        end: 11
        value: '-1.123e4567'

lex reports useful number errors:
  - name: zero
    input: "00"
    error:
      message: 'Invalid number, unexpected digit after 0: "0".'
      locations: [{ line: 1, column: 2 }]

  - name: positive
    input: "+1"
    error:
      message: 'Cannot parse the unexpected character "+".'
      locations: [{ line: 1, column: 1 }]

  - name: trailing dot
    input: "1."
    error:
      message: 'Invalid number, expected digit but got: <EOF>.'
      locations: [{ line: 1, column: 3 }]

  - name: traililng dot exponent
    input: "1.e1"
    error:
      message: 'Invalid number, expected digit but got: "e".'
      locations: [{ line: 1, column: 3 }]

  - name: missing leading zero
    input: ".123"
    error:
      message: 'Cannot parse the unexpected character ".".'
      locations: [{ line: 1, column: 1 }]

  - name: characters
    input: "1.A"
    error:
      message: 'Invalid number, expected digit but got: "A".'
      locations: [{ line: 1, column: 3 }]

  - name: negative characters
    input: "-A"
    error:
      message: 'Invalid number, expected digit but got: "A".'
      locations: [{ line: 1, column: 2 }]

  - name: missing exponent
    input: '1.0e'
    error:
      message: 'Invalid number, expected digit but got: <EOF>.'
      locations: [{ line: 1, column: 5 }]

  - name: character exponent
    input: "1.0eA"
    error:
      message: 'Invalid number, expected digit but got: "A".'
      locations: [{ line: 1, column: 5 }]

lexes punctuation:
  - name: bang
    input: "!"
    tokens:
      -
        kind: BANG
        start: 0
        end: 1
        value: undefined

  - name: dollar
    input: "$"
    tokens:
      -
        kind: DOLLAR
        start: 0
        end: 1
        value: undefined

  - name: open paren
    input: "("
    tokens:
      -
        kind: PAREN_L
        start: 0
        end: 1
        value: undefined

  - name: close paren
    input: ")"
    tokens:
      -
        kind: PAREN_R
        start: 0
        end: 1
        value: undefined

  - name: spread
    input: "..."
    tokens:
      -
        kind: SPREAD
        start: 0
        end: 3
        value: undefined

  - name: colon
    input: ":"
    tokens:
      -
        kind: COLON
        start: 0
        end: 1
        value: undefined

  - name: equals
    input: "="
    tokens:
      -
        kind: EQUALS
        start: 0
        end: 1
        value: undefined

  - name: at
    input: "@"
    tokens:
      -
        kind: AT
        start: 0
        end: 1
        value: undefined

  - name: open bracket
    input: "["
    tokens:
      -
        kind: BRACKET_L
        start: 0
        end: 1
        value: undefined

  - name: close bracket
    input: "]"
    tokens:
      -
        kind: BRACKET_R
        start: 0
        end: 1
        value: undefined

  - name: open brace
    input: "{"
    tokens:
      -
        kind: BRACE_L
        start: 0
        end: 1
        value: undefined

  - name: close brace
    input: "}"
    tokens:
      -
        kind: BRACE_R
        start: 0
        end: 1
        value: undefined

  - name: pipe
    input: "|"
    tokens:
      -
        kind: PIPE
        start: 0
        end: 1
        value: undefined

lex reports useful unknown character error:
  - name: not a spread
    input: ".."
    error:
      message: 'Cannot parse the unexpected character ".".'
      locations: [{ line: 1, column: 1 }]

  - name: question mark
    input: "?"
    error:
      message: 'Cannot parse the unexpected character "?".'
      message: 'Cannot parse the unexpected character "?".'
      locations: [{ line: 1, column: 1 }]

  - name: unicode 203
    input: "\u203B"
    error:
      message: 'Cannot parse the unexpected character "â".'
      locations: [{ line: 1, column: 1 }]

  - name: unicode 200
    input: "\u200b"
    error:
      message: 'Cannot parse the unexpected character "â".'
      locations: [{ line: 1, column: 1 }]