213 lines
3.9 KiB
JavaScript
213 lines
3.9 KiB
JavaScript
const
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unicodeLetter = /\p{L}/
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unicodePunctuation = /\p{Pc}/
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unicodeDigit = /[0-9]/
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module.exports = grammar({
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name: 'hcl',
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conflicts: $ => [
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[$.body],
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[$.object_elem, $.variable_expr],
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[$.attr_splat],
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[$.full_splat],
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[$.conditional],
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],
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extras: $ => [
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$.comment,
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/\s/,
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],
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rules: {
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config_file: $ => $.body,
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body: $ => repeat1(seq(
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choice(
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$.attribute,
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$.block,
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),
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)),
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attribute: $ => seq(
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field('name', $.identifier),
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'=',
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$.expression,
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),
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block: $ => seq(
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field('name', $.identifier),
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repeat(choice($.string_lit, $.identifier)),
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'{',
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optional($.body),
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'}',
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),
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// TODO: not to spec but good enough for now
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identifier: $ => token(seq(
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unicodeLetter,
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repeat(choice(unicodeLetter, unicodeDigit, unicodePunctuation)),
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)),
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expression: $ => choice(
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$.expr_term,
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//$.operation,
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$.conditional,
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),
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expr_term: $ => choice(
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$.literal_value,
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$.collection_value,
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$.variable_expr,
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$.function_call,
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$.for_expr,
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seq($.expr_term, $.index),
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seq($.expr_term, $.get_attr),
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seq($.expr_term, $.splat),
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seq('(', $.expression, ')'),
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),
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literal_value: $ => choice(
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$.numeric_lit,
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$.string_lit,
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$.bool_lit,
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$.null_lit,
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),
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numeric_lit: $ => /[0-9]+(\.[0-9]+([eE][-+]?[0-9]+)?)?/,
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string_lit: $ => seq(
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'"',
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repeat(choice(token.immediate(prec(1, /[^\\"\n\r\t]+/)), $.escape_sequence)),
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'"',
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),
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escape_sequence: $ => token.immediate(seq(
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'\\',
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choice(
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'\\',
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'"',
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'n',
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'r',
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't',
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/u[0-9a-fA-F]{4}/,
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/U[0-9a-fA-F]{8}/
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)
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)),
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bool_lit: $ => choice('true', 'false'),
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null_lit: $ => 'null',
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collection_value: $ => choice(
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$.tuple,
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$.object,
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),
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tuple: $ => seq(
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'[',
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optional(seq(
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$.expression,
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repeat(seq(',', $.expression)),
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)),
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']',
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),
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object: $ => seq(
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'{',
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optional(seq(
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$.object_elem,
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repeat(seq(',', $.object_elem)),
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)),
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'}',
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),
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object_elem: $ => seq(
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choice($.identifier, $.expression),
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choice('=', ':'),
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$.expression,
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),
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index: $ => seq('[', $.expression, ']'),
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get_attr: $ => seq('.', $.identifier),
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splat: $ => choice($.attr_splat, $.full_splat),
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attr_splat: $ => seq('.', '*', repeat($.get_attr)),
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full_splat: $ => seq('[', '*', ']', repeat(choice($.get_attr, $.index))),
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for_expr: $ => choice($.for_tuple_expr, $.for_object_expr),
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for_tuple_expr: $ => seq(
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'[',
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$.for_intro,
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$.expression,
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optional($.for_cond),
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']',
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),
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for_object_expr: $ => seq(
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'{',
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$.for_intro,
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$.expression,
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'=>',
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$.expression,
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optional($.ellipsis),
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optional($.for_cond),
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'}',
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),
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for_intro: $ => seq(
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'for',
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$.identifier,
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optional(seq(',', $.identifier)),
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'in',
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$.expression,
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':',
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),
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for_cond: $ => seq(
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'if',
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$.expression,
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),
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variable_expr: $ => $.identifier,
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function_call: $ => seq(
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field('name', $.identifier),
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'(',
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optional($.function_arguments),
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')'
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),
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function_arguments: $ => seq(
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$.expression,
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repeat(seq(',', $.expression)),
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optional(choice(',', $.ellipsis))
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),
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ellipsis: $ => token('...'),
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conditional: $ => seq(
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$.expression,
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'?',
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$.expression,
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':',
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$.expression,
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),
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// http://stackoverflow.com/questions/13014947/regex-to-match-a-c-style-multiline-comment/36328890#36328890
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comment: $ => token(choice(
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seq('#', /.*/),
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seq('//', /.*/),
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seq(
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'/*',
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/[^*]*\*+([^/*][^*]*\*+)*/,
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'/'
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)
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)),
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}
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});
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