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module.exports = grammar({
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name: "d2",
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word: ($) => $._word,
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rules: {
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// TODO: add the actual grammar rules
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source_file: ($) => repeat($._definition),
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_definition: ($) => choice($._root_attribute, $.connection, $.shape),
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connection: ($) =>
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seq(
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$.identifier,
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choice(
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seq(seq($.arrow, $.identifier, $._colon, $.label)),
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seq(repeat1(seq($.arrow, $.identifier)))
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),
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$._end
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),
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shape: ($) =>
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seq(
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$.identifier,
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repeat(seq($.dot, $.identifier)),
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choice(
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optional(seq($.dot, $._shape_attribute)),
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optional(seq($._colon, $.label))
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),
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$._end
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),
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label: ($) => choice($.string, $._unquoted_string),
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identifier: ($) => $._identifier,
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attr_value: ($) => choice($.string, $._unquoted_string),
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_root_attribute: ($) =>
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seq(alias($._root_attr_key, $.attr_key), $._colon, $.attr_value, $._end),
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_root_attr_key: ($) => "direction",
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_style_attribute: ($) =>
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seq(
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alias("style", $.attr_key),
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$.dot,
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alias($._style_attr_key, $.attr_key),
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$._colon,
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$.attr_value
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),
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_shape_attribute: ($) =>
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choice(
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seq(alias($._shape_attr_key, $.attr_key), $._colon, $.attr_value),
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$._style_attribute
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),
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_shape_attr_key: ($) =>
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choice(
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"shape",
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"label",
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// sql
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"constraint",
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// image
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"icon",
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"width",
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"height"
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),
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_style_attr_key: ($) =>
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choice(
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"opacity",
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"fill",
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"stroke",
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"stroke-width",
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"stroke-dash",
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"border-radius",
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"font-color",
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"shadow",
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"multiple",
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"animated",
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"3d",
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"link"
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),
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_text_attr_key: ($) => "near",
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_connection_attr_key: ($) => choice("source-arrowhead", "target-arrowhead"),
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_identifier: ($) =>
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prec.right(
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seq(
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repeat(" "),
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optional($._dash),
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choice(
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$._word,
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repeat1(seq($._word, choice(repeat(" "), $._dash), $._word))
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),
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optional($._dash),
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repeat(" ")
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)
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),
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_colon: ($) => seq(repeat(" "), ":", repeat(" ")),
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_dash: ($) => token.immediate("-"),
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_word: ($) => /[\w\d]+/,
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arrow: ($) =>
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prec.left(
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choice(
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seq("--", repeat($._dash)),
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seq("<-", repeat($._dash)),
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seq("<-", repeat($._dash), ">"),
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seq(repeat($._dash), "->")
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)
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),
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_unquoted_string: ($) => token.immediate(/[^'"`\n;{]+/),
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string: ($) =>
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choice(
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seq("'", repeat(token.immediate(/[^'\n]+/)), "'"),
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seq('"', repeat(token.immediate(/[^"\n]+/)), '"'),
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seq("`", repeat(token.immediate(/[^`\n]+/)), "`")
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),
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_end: ($) => choice(";", "\n", "\0"),
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dot: ($) => ".",
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},
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});
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