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grammar.js
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/// <reference types="tree-sitter-cli/dsl" />
// @ts-check
const PREC = {
VAR_COMMENT_PREFIX: 2,
BODY_PREFIX: 2,
RAW_BODY: 3,
GRAPQL_JSON_PREFIX: 4,
COMMENT_PREFIX: 5,
REQ_SEPARATOR: 9,
};
const WORD_CHAR = /[\p{L}\p{N}]/u;
const PUNCTUATION = /[^\n\r\p{Z}\p{L}\p{N}]/u;
const WS = /\p{Zs}+/u;
const NL = token(choice("\n", "\r", "\r\n", "\0"));
const LINE_TAIL = token(seq(/.*/, NL));
const ESCAPED = token(/\\[^\n\r]/);
const COMMENT_PREFIX = token(
prec(PREC.COMMENT_PREFIX, choice(/#\s*/, /\/\/\s*/)),
);
module.exports = grammar({
name: "http",
extras: (_) => [],
conflicts: ($) => [
[$.target_url],
[$.raw_body],
[$._raw_body],
[$._section_content],
],
inline: ($) => [$._target_url_line, $.__body],
rules: {
document: ($) => repeat($.section),
// NOTE: just for debugging purpose
WORD_CHAR: (_) => WORD_CHAR,
PUNCTUATION: (_) => PUNCTUATION,
WS: (_) => WS,
NL: (_) => NL,
LINE_TAIL: (_) => LINE_TAIL,
COMMENT_PREFIX: (_) => COMMENT_PREFIX,
comment: ($) =>
choice(
$._plain_comment,
$._var_comment,
),
_plain_comment: (_) =>
seq(
COMMENT_PREFIX,
LINE_TAIL,
),
_var_comment: ($) =>
seq(
COMMENT_PREFIX,
token(prec(PREC.VAR_COMMENT_PREFIX, "@")),
field("name", $.identifier),
optional(
seq(
choice(WS, "="),
optional(token(prec(1, WS))),
field("value", $.value),
),
),
NL,
),
request_separator: ($) =>
seq(
token(prec(PREC.REQ_SEPARATOR, /###+\p{Zs}*/)),
optional(token(prec(1, WS))),
optional(field("value", $.value)),
NL,
),
section: ($) =>
prec.right(
choice(
seq($.request_separator, optional($._section_content)),
$._section_content,
),
),
// NOTE: grammatically, each request section should contain only single `$.request` node
// we are allowing multiple `$.request` nodes here to lower the parser size
_section_content: ($) =>
choice(
seq($._blank_line, optional($._section_content)),
seq($.comment, optional($._section_content)),
seq($.variable_declaration, optional($._section_content)),
seq($.pre_request_script, optional($._section_content)),
// field to easily find request node in each section
field("request", $.request),
field("response", $.response),
),
// LIST http verb is arbitrary and required to use vaultproject
method: (_) =>
/(OPTIONS|GET|HEAD|POST|PUT|DELETE|TRACE|CONNECT|PATCH|LIST|GRAPHQL|WEBSOCKET)/,
http_version: (_) => prec.dynamic(1, token(prec(0, /HTTP\/[\d\.]+/))),
_target_url_line: ($) =>
repeat1(choice(WORD_CHAR, PUNCTUATION, $.variable, WS)),
target_url: ($) =>
seq($._target_url_line, repeat(seq(NL, WS, $._target_url_line))),
status_code: (_) => /[1-5]\d{2}/,
status_text: (_) =>
/(Continue|Switching Protocols|Processing|OK|Created|Accepted|Non-Authoritative Information|No Content|Reset Content|Partial Content|Multi-Status|Already Reported|IM Used|Multiple Choices|Moved Permanently|Found|See Other|Not Modified|Use Proxy|Switch Proxy|Temporary Redirect|Permanent Redirect|Bad Request|Unauthorized|Payment Required|Forbidden|Not Found|Method Not Allowed|Not Acceptable|Proxy Authentication Required|Request Timeout|Conflict|Gone|Length Required|Precondition Failed|Payload Too Large|URI Too Long|Unsupported Media Type|Range Not Satisfiable|Expectation Failed|I'm a teapot|Misdirected Request|Unprocessable Entity|Locked|Failed Dependency|Too Early|Upgrade Required|Precondition Required|Too Many Requests|Request Header Fields Too Large|Unavailable For Legal Reasons|Internal Server Error|Not Implemented|Bad Gateway|Service Unavailable|Gateway Timeout|HTTP Version Not Supported|Variant Also Negotiates|Insufficient Storage|Loop Detected|Not Extended|Network Authentication Required)/,
__body: ($) =>
seq(
repeat1($._blank_line),
prec.right(
repeat(
choice(
alias($._var_comment, $.comment),
field(
"body",
choice(
$.raw_body,
$.multipart_form_data,
$.xml_body,
$.json_body,
$.graphql_body,
$._external_body,
),
),
NL,
$.res_handler_script,
$.res_redirect,
),
),
),
),
response: ($) =>
prec.right(
seq(
$.http_version,
WS,
$.status_code,
WS,
optional($.status_text),
NL,
repeat(field("header", $.header)),
optional($.__body),
),
),
request: ($) =>
prec.right(
seq(
optional(seq(field("method", $.method), WS)),
field("url", $.target_url),
optional(seq(WS, field("version", $.http_version))),
NL,
repeat(
choice(
$.comment,
field("header", $.header),
),
),
optional($.__body),
),
),
query_param: ($) =>
prec.right(
seq(
field("key", $.value),
optional(seq("=", optional(field("value", $.value)))),
),
),
header: ($) =>
seq(
field("name", $.header_entity),
optional(WS),
":",
optional(token(prec(1, WS))),
optional(field("value", choice($.value))),
NL,
),
// {{foo}} {{$bar}} {{ fizzbuzz }}
variable: ($) =>
seq(
token(prec(1, "{{")),
optional(WS),
field("name", $.identifier),
optional(WS),
token(prec(1, "}}")),
),
pre_request_script: ($) =>
seq("<", WS, choice($.script, $.path), token(repeat1(NL))),
res_handler_script: ($) =>
seq(
token(prec(PREC.REQ_SEPARATOR, ">")),
WS,
choice($.script, $.path),
token(repeat1(NL)),
),
script: (_) =>
seq(
token(prec(1, "{%")),
NL,
repeat(LINE_TAIL),
token(prec(1, "%}")),
),
res_redirect: ($) =>
seq(
token(prec(PREC.REQ_SEPARATOR, />>!?/)),
WS,
field("path", $.path),
token(repeat1(NL)),
),
variable_declaration: ($) =>
seq(
"@",
field("name", $.identifier),
optional(WS),
"=",
optional(token(prec(1, WS))),
field("value", $.value),
NL,
),
xml_body: ($) =>
seq(token(prec(PREC.BODY_PREFIX, /<[^\s@]/)), $._raw_body),
json_body: ($) =>
seq(token(prec(PREC.BODY_PREFIX, /[{\[]\s+/)), $._raw_body),
graphql_body: ($) =>
prec.right(
seq(
$.graphql_data,
optional(alias($.graphql_json_body, $.json_body)),
),
),
graphql_data: ($) =>
seq(
token(
prec(
PREC.BODY_PREFIX,
seq(choice("query", "mutation"), WS, /.*\{/, NL),
),
),
$._raw_body,
),
graphql_json_body: ($) =>
seq(token(prec(PREC.GRAPQL_JSON_PREFIX, /[{\[]\s+/)), $._raw_body),
_external_body: ($) => seq($.external_body, NL),
external_body: ($) =>
seq(
token(prec(PREC.BODY_PREFIX, "<")),
optional(seq("@", optional(field("name", $.identifier)))),
WS,
field("path", $.path),
),
multipart_form_data: ($) =>
prec.right(
seq(
token(prec(PREC.BODY_PREFIX, "--")),
token(prec(1, LINE_TAIL)),
repeat(
choice(
$.comment,
seq($.external_body, choice(WS, NL)),
token(prec(2, /<[^\s@]/)),
token(prec(2, "--")),
token(prec(2, /[{\[]\s+/)),
token(prec(1, LINE_TAIL)),
token(prec(2, NL)),
),
),
),
),
raw_body: ($) =>
seq(
choice(
token(prec(1, seq(/.+/, NL))),
seq(COMMENT_PREFIX, $._not_comment),
),
optional($._raw_body),
),
_raw_body: ($) =>
seq(
choice(
token(prec(PREC.RAW_BODY, LINE_TAIL)),
seq(COMMENT_PREFIX, $._not_comment),
),
optional($._raw_body),
),
_not_comment: (_) => token(seq(/[^@]*/, NL)),
header_entity: (_) => /[\w\-]+/,
identifier: (_) => /[A-Za-z_.\$\d\u00A1-\uFFFF-]+/,
path: ($) =>
prec.right(
repeat1(choice(WORD_CHAR, PUNCTUATION, $.variable, ESCAPED)),
),
value: ($) => repeat1(choice(WORD_CHAR, PUNCTUATION, $.variable, WS)),
_blank_line: (_) => seq(optional(WS), token(prec(-1, NL))),
},
});