| 1 | const NEWLINE = /\r?\n/;
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| 2 | const WHITE_SPACE = /[\t\f\v ]+/;
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| 3 | const ANYTHING = /[^\r\n]+/;
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| 4 |
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| 5 | module.exports = grammar({
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| 6 | name: "diff",
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| 7 |
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| 8 | extras: ($) => [WHITE_SPACE],
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| 9 |
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| 10 | rules: {
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| 11 | source: ($) =>
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| 12 | seq(
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| 13 | repeat(choice($.block, seq(optional($._line), NEWLINE))),
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| 14 | optional($._line)
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| 15 | ),
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| 16 |
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| 17 | _line: ($) =>
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| 18 | choice(
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| 19 | $.file_change,
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| 20 | $.binary_change,
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| 21 | $.index,
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| 22 | $.similarity,
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| 23 | $.old_file,
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| 24 | $.new_file,
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| 25 | $.location,
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| 26 | $.addition,
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| 27 | $.deletion,
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| 28 | $.context,
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| 29 | $.comment
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| 30 | ),
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| 31 |
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| 32 | block: ($) =>
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| 33 | prec.right(
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| 34 | seq(
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| 35 | $.command,
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| 36 | NEWLINE,
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| 37 | repeat(
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| 38 | seq(
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| 39 | choice($.file_change, $.binary_change, $.index, $.similarity),
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| 40 | NEWLINE
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| 41 | )
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| 42 | ),
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| 43 | optional(seq($.old_file, NEWLINE, $.new_file, NEWLINE, $.hunks))
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| 44 | )
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| 45 | ),
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| 46 |
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| 47 | hunks: ($) => prec.right(repeat1($.hunk)),
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| 48 |
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| 49 | hunk: ($) =>
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| 50 | prec.right(
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| 51 | seq(
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| 52 | field("location", $.location),
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| 53 | NEWLINE,
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| 54 | optional(field("changes", $.changes))
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| 55 | )
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| 56 | ),
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| 57 |
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| 58 | changes: ($) =>
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| 59 | prec.right(
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| 60 | repeat1(
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| 61 | seq(
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| 62 | choice($.addition, $.deletion, $.context),
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| 63 | prec.right(repeat1(NEWLINE))
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| 64 | )
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| 65 | )
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| 66 | ),
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| 67 |
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| 68 | command: ($) => iseq("diff", alias(/[-\w]+/, $.argument), $.filename),
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| 69 |
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| 70 | file_change: ($) =>
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| 71 | choice(
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| 72 | seq(choice("new", "deleted"), "file", "mode", $.mode),
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| 73 | seq(choice("new", "old"), "mode", $.mode),
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| 74 | seq("rename", choice("from", "to"), $.filename)
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| 75 | ),
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| 76 |
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| 77 | binary_change: ($) =>
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| 78 | iseq("Binary", "files", $.filename, "and", $.filename, "differ"),
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| 79 |
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| 80 | index: ($) => iseq("index", $.commit, "..", $.commit, optional($.mode)),
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| 81 |
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| 82 | similarity: ($) => iseq("similarity", "index", alias(/\d+/, $.score), "%"),
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| 83 |
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| 84 | old_file: ($) => iseq("---", $.filename),
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| 85 | new_file: ($) => iseq("+++", $.filename),
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| 86 |
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| 87 | location: ($) =>
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| 88 | iseq("@@", $.linerange, $.linerange, "@@", optional(ANYTHING)),
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| 89 |
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| 90 | addition: ($) =>
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| 91 | choice(
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| 92 | iseq("+", optional(ANYTHING)),
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| 93 | iseq("++", optional(ANYTHING)),
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| 94 | iseq("+++"),
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| 95 | iseq("++++", optional(ANYTHING))
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| 96 | ),
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| 97 | deletion: ($) =>
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| 98 | choice(
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| 99 | iseq("-", optional(ANYTHING)),
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| 100 | iseq("--", optional(ANYTHING)),
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| 101 | iseq("---"),
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| 102 | iseq("----", optional(ANYTHING))
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| 103 | ),
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| 104 |
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| 105 | context: ($) => token(prec(-1, ANYTHING)),
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| 106 | comment: ($) => iseq("#", optional(ANYTHING)),
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| 107 |
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| 108 | linerange: ($) => /[-\+]\d+(,\d+)?/,
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| 109 | filename: ($) => repeat1(/\S+/),
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| 110 | commit: ($) => /[a-f0-9]{7,40}/,
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| 111 | mode: ($) => /\d+/,
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| 112 | },
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| 113 | });
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| 114 |
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| 115 | function iseq(start_token, ...tokens) {
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| 116 | return seq(token.immediate(start_token), ...tokens);
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| 117 | }
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