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make_grammar.js
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make_grammar.js
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const PREC = {
primary: 1,
else_if: 1,
else: 2,
},
unicodeLetter = /\p{L}/,
unicodeDigit = /[0-9]/,
unicodeChar = /./,
unicodeValue = unicodeChar,
letter = choice(unicodeLetter, '_'),
hexDigit = /[0-9a-fA-F]/,
octalDigit = /[0-7]/,
decimalDigit = /[0-9]/,
binaryDigit = /[01]/,
hexDigits = seq(hexDigit, repeat(seq(optional('_'), hexDigit))),
octalDigits = seq(octalDigit, repeat(seq(optional('_'), octalDigit))),
decimalDigits = seq(decimalDigit, repeat(seq(optional('_'), decimalDigit))),
binaryDigits = seq(binaryDigit, repeat(seq(optional('_'), binaryDigit))),
hexLiteral = seq('0', choice('x', 'X'), optional('_'), hexDigits),
octalLiteral = seq(
'0',
optional(choice('o', 'O')),
optional('_'),
octalDigits
),
decimalLiteral = choice(
'0',
seq(/[1-9]/, optional(seq(optional('_'), decimalDigits)))
),
binaryLiteral = seq('0', choice('b', 'B'), optional('_'), binaryDigits),
intLiteral = choice(
binaryLiteral,
decimalLiteral,
octalLiteral,
hexLiteral
),
decimalExponent = seq(
choice('e', 'E'),
optional(choice('+', '-')),
decimalDigits
),
decimalFloatLiteral = choice(
seq(
decimalDigits,
'.',
optional(decimalDigits),
optional(decimalExponent)
),
seq(decimalDigits, decimalExponent),
seq('.', decimalDigits, optional(decimalExponent))
),
hexExponent = seq(
choice('p', 'P'),
optional(choice('+', '-')),
decimalDigits
),
hexMantissa = choice(
seq(optional('_'), hexDigits, '.', optional(hexDigits)),
seq(optional('_'), hexDigits),
seq('.', hexDigits)
),
hexFloatLiteral = seq('0', choice('x', 'X'), hexMantissa, hexExponent),
floatLiteral = choice(decimalFloatLiteral, hexFloatLiteral),
imaginaryLiteral = seq(choice(decimalDigits, intLiteral, floatLiteral), 'i')
module.exports = function make_grammar(dialect) {
return grammar({
name: dialect,
conflicts: $ => [
// conflict between a template in an else if clause and the beginning of the
// else clause in not solveable with LR(1)
[$._else_clause],
[$._else_if_clause],
],
rules: {
template: ($) => repeat($._block),
_block: ($) => choice($.yaml_no_injection_text, $.text, $._action),
// This rule is a workaround to fix https://github.com/ngalaiko/tree-sitter-go-template/issues/23
// by creating a new node type that is not used for injections of the yaml language.
// The better solution would be to fix the issue in the yaml grammar.
// If https://github.com/tree-sitter-grammars/tree-sitter-yaml/issues/12 is resolved, this rule can be removed.
yaml_no_injection_text: ($) => choice('-'),
text: ($) =>
choice(
// forbid '{{', the rest is valid
/[^{]+/,
/\{/
),
_action: ($) =>
prec(
2,
choice(
$._comment_action,
$._pipeline_action,
$.if_action,
$.range_action,
$.template_action,
$.define_action,
$.block_action,
$.with_action
)
),
_comment_action: ($) =>
seq($._left_delimiter, $.comment, $._right_delimiter),
_pipeline_action: ($) =>
seq($._left_delimiter, $._pipeline, $._right_delimiter),
if_action: $ => seq(
$._left_delimiter,
'if',
field('condition', $._pipeline),
$._right_delimiter,
field('consequence', repeat($._block)),
repeat($._else_if_clause),
optional($._else_clause),
prec.right(0, $._if_actions_end)
),
_else_if_clause: $ => prec.dynamic(PREC.else_if, seq(
$._left_delimiter,
'else if',
field('condition', $._pipeline),
$._right_delimiter,
field('option', repeat($._block)),
)),
_else_clause: $ => prec.dynamic(PREC.else, seq(
$._left_delimiter,
'else',
$._right_delimiter,
(field('alternative', repeat($._block))),
)),
_if_actions_end: $ => seq(
$._left_delimiter,
'end',
$._right_delimiter
),
range_variable_definition: ($) =>
seq(
field('index', $.variable),
',',
field('element', $.variable),
token(':='),
field('range', $._pipeline)
),
range_action: ($) =>
seq(
$._left_delimiter,
'range',
choice(
$.range_variable_definition,
field('range', $._pipeline)
),
$._right_delimiter,
field('body', repeat($._block)),
optional(
seq(
$._left_delimiter,
'else',
$._right_delimiter,
field('alternative', repeat($._block))
)
),
$._left_delimiter,
'end',
$._right_delimiter
),
template_action: ($) =>
seq(
$._left_delimiter,
'template',
field('name', $._string_literal),
optional(field('argument', $._pipeline)),
$._right_delimiter
),
define_action: ($) =>
seq(
$._left_delimiter,
'define',
field('name', $._string_literal),
$._right_delimiter,
field('body', repeat($._block)),
$._left_delimiter,
'end',
$._right_delimiter
),
block_action: ($) =>
seq(
$._left_delimiter,
'block',
field('name', $._string_literal),
optional(field('argument', $._pipeline)),
$._right_delimiter,
field('body', repeat($._block)),
$._left_delimiter,
'end',
$._right_delimiter
),
with_action: ($) =>
seq(
$._left_delimiter,
'with',
field('condition', $._pipeline),
$._right_delimiter,
field('consequence', repeat($._block)),
optional(
seq(
$._left_delimiter,
'else',
$._right_delimiter,
field('alternative', repeat($._block))
)
),
$._left_delimiter,
'end',
$._right_delimiter
),
_pipeline: ($) =>
choice(
$._expression,
$.function_call,
$.method_call,
$.chained_pipeline,
$.parenthesized_pipeline,
$.variable_definition,
$.assignment
),
variable_definition: ($) =>
seq(
field('variable', $.variable),
':=',
field('value', $._pipeline)
),
assignment: ($) =>
seq(
field('variable', $.variable),
'=',
field('value', $._pipeline)
),
chained_pipeline: ($) =>
prec.left(PREC.primary, seq($._pipeline, '|', $._pipeline)),
parenthesized_pipeline: ($) => seq('(', $._pipeline, ')'),
method_call: ($) =>
seq(
field('method', choice($.field, $.selector_expression)),
field('arguments', $.argument_list)
),
function_call: ($) =>
prec.right(
PREC.primary,
seq(
field('function', $.identifier),
optional(field('arguments', $.argument_list))
)
),
argument_list: ($) =>
prec.right(
seq($._pipeline, repeat(seq(' ', $._pipeline)), optional(' '))
),
pipeline_stub: ($) => token('pipeline'),
_expression: ($) =>
prec(
PREC.primary,
choice(
$._literal,
$.nil,
$.dot,
$.field,
$.variable,
$.selector_expression
)
),
selector_expression: ($) =>
prec(
PREC.primary,
seq(
field('operand',
choice($.parenthesized_pipeline, $.field, $.variable, $.selector_expression)),
token.immediate('.'),
field('field', $._field_identifier)
)
),
_field_identifier: ($) => alias($.identifier, $.field_identifier),
field: ($) => seq('.', field('name', $.identifier)),
variable: ($) => seq('$', optional(field('name', $.identifier))),
identifier: ($) =>
token(seq(letter, repeat(choice(letter, unicodeDigit)))),
_literal: ($) =>
choice(
$._boolean_literal,
$._string_literal,
$.rune_literal,
$.int_literal,
$.float_literal,
$.imaginary_literal
),
int_literal: ($) => token(intLiteral),
float_literal: ($) => token(floatLiteral),
imaginary_literal: ($) => token(imaginaryLiteral),
rune_literal: ($) =>
token(
seq(
"'",
choice(
/[^'\\]/,
seq(
'\\',
choice(
seq('x', hexDigit, hexDigit),
seq(octalDigit, octalDigit, octalDigit),
seq(
'u',
hexDigit,
hexDigit,
hexDigit,
hexDigit
),
seq(
'U',
hexDigit,
hexDigit,
hexDigit,
hexDigit,
hexDigit,
hexDigit,
hexDigit,
hexDigit
),
seq(
choice(
'a',
'b',
'f',
'n',
'r',
't',
'v',
'\\',
"'",
'"'
)
)
)
)
),
"'"
)
),
_boolean_literal: ($) => choice($.true, $.false),
true: ($) => 'true',
false: ($) => 'false',
nil: ($) => 'nil',
dot: ($) => prec(1, '.'),
_string_literal: ($) =>
choice($.raw_string_literal, $.interpreted_string_literal),
raw_string_literal: ($) => token(seq('`', repeat(/[^`]/), '`')),
interpreted_string_literal: ($) =>
seq(
'"',
repeat(
choice(
token.immediate(prec(1, /[^"\n\\]+/)),
$.escape_sequence
)
),
'"'
),
escape_sequence: ($) =>
token.immediate(
seq(
'\\',
choice(
/[^xuU]/,
/\d{2,3}/,
/x[0-9a-fA-F]{2,}/,
/u[0-9a-fA-F]{4}/,
/U[0-9a-fA-F]{8}/
)
)
),
// http://stackoverflow.com/questions/13014947/regex-to-match-a-c-style-multiline-comment/36328890#36328890
comment: ($) =>
token(
choice(
seq('//', /.*/),
seq('/*', /[^*]*\*+([^/*][^*]*\*+)*/, '/')
)
),
_left_delimiter: ($) => choice(token('{{'), token('{{-')),
_right_delimiter: ($) => choice(token('}}'), token('-}}')),
},
})
}
function sep1(separator, rule) {
return seq(rule, repeat(seq(separator, rule)))
}
function sep(separator, rule) {
return optional(sep1(separator, rule))
}