{
    "$schema": "https://raw.githubusercontent.com/martinring/tmlanguage/master/tmlanguage.json",
    "name": "mligo",
    "patterns": [
        { "include": "#string" },
        { "include": "#single-quotes" },
        { "include": "#comment" },
        { "include": "#list-cons" },
        { "include": "#let-binding" },
        { "include": "#lambda" },
        { "include": "#type-definition" },
        { "include": "#type-annotation" },
        { "include": "#control-keywords" },
        { "include": "#other-keywords" },
        { "include": "#numeric-literals" },
        { "include": "#operators" },
        { "include": "#function-application" },
        { "include": "#identifiers" }
    ],
    "repository": {
        "let-binding": {
            "begin": "\\b(let)\\b",
            "end": "(\\=)",
            "beginCaptures": {
                "1": { "name": "keyword.other.let-binding.mligo" }
            },
            "endCaptures": {
                "1": { "name": "keyword.operator.eq.mligo"}
            },
            "patterns": [
                { "include": "#comment" },
                { "include": "#let-rec" },
                { "include": "#let-function" },
                { "include": "#let-constant" }
            ]
        },

        "let-rec": {
            "match": "\\b(rec)\\b",
            "name": "keyword.other.recursive.mligo"
        },

        "let-function": {
            "begin": "([a-zA-Z_]\\w*)?\\b(?=\\s*\\()",
            "beginCaptures": {
                "1": { "name": "entity.name.function.mligo" }
            },
            "end": "(?=\\=)",
            "patterns": [
                { "include": "#comment" },
                { "include": "#parenthesized-definition" },
                { "include": "#type-annotation" }
            ]
        },

        "parenthesized-definition": {
            "begin": "\\(",
            "beginCaptures": {
                "1": { "name": "keyword.operator.parenthesis.mligo" }
            },
            "end": "\\)",
            "endCaptures": {
                "1": { "name": "keyword.operator.parenthesis.mligo" }
            },
            "patterns": [
                { "include": "#comment" },
                { "include": "#names-tuple" },
                { "include": "#type-annotation" }
            ]
        },

        "names-tuple": {
            "begin": "(?<=\\()",
            "end": "(?=:)",
            "patterns": [
                { "include": "#comment" },
                { "include": "#names-tuple-name" }
            ]
        },

        "names-tuple-name": {
            "match": "(?:([a-zA-Z_]\\w*)(?=\\s*[,:]))+",
            "name": "support.variable.parameter.mligo"
        },

        "type-annotation": {
            "begin": "(:)\\s*",
            "beginCaptures": {
                "1": { "name": "keyword.operator.type.mligo" }
            },
            "end": "(?:[;|]|(?=[)=}])|$)",
            "patterns": [
                { "include": "#comment" },
                { "include": "#type-expression" }
            ]
        },

        "type-expression": {
            "patterns": [
                {
                    "begin": "\\(",
                    "end": "\\)",
                    "patterns": [
                        { "include": "#comment" },
                        { "include": "#type-expression" }
                    ]
                },
                {
                    "match": "([^=()|;}]*)",
                    "captures": {
                        "1": { "name": "entity.name.type.mligo" }
                    }
                }
            ]
        },

        "let-constant": {
            "begin": "([a-zA-Z_]\\w*)\\b(?!\\s*\\()",
            "beginCaptures": {
                "1": { "name": "support.variable.mligo" }
            },
            "end": "(?=\\=)",
            "patterns": [
                { "include": "#comment" },
                { "include": "#type-annotation" }
            ]
        },

        "lambda": {
            "begin": "\\b(fun)\\b",
            "beginCaptures": {
                "1": { "name": "keyword.other.lambda.mligo" }
            },
            "end": "(->)",
            "endCaptures": {
                "1": { "name": "keyword.operator.lambda.mligo"}
            },
            "patterns": [
                { "include": "#comment" },
                { "include": "#parenthesized-definition" }
            ]
        },

        "type-definition": {
            "begin": "\\b(type)\\s+([a-zA-Z_]\\w*)\\b",
            "beginCaptures": {
                "1": { "name": "keyword.other.typedef.mligo" },
                "2": { "name": "entity.name.type.mligo" }
            },
            "end": "(?=(?:\\blet\\b|\\btype\\b))",
            "patterns": [
                { "include": "#comment" },
                { "include": "#struct-type" },
                { "include": "#sum-type" }
            ]
        },

        "struct-type": {
            "begin": "\\{",
            "end": "\\}",
            "patterns": [
                { "include": "#comment" },
                { "include": "#names-tuple-name" },
                { "include": "#type-annotation" }
            ]
        },

        "sum-type": {
            "begin": "\\b([a-zA-Z_]\\w*)\\s+(of)",
            "beginCaptures": {
                "1": { "name": "entity.name.function.mligo" },
                "2": { "name": "keyword.other.of.mligo" }
            },
            "end": "(\\||\\blet\\b|\\btype\\b)",
            "patterns": [
                { "include": "#type-expression" }
            ]
        },

        "string": {
            "name": "string.quoted.double.mligo",
            "begin": "\"",
            "end": "\"",
            "patterns": [{
                    "name": "constant.character.escape.mligo",
                    "match": "\\\\."
            }]
        },
        "single-quotes" : {
            "name": "string.quoted.single.mligo",
            "begin": "\\'",
            "end": "\\'",
            "patterns" : []
        },


        "comment": {
            "patterns": [
                {
                    "name": "comment.line.double-slash.mligo",
                    "match": "(//.*)"
                },
                {
                    "name" : "comment.line.double-slash.mligo",
                    "begin" : "\\(\\*",
                    "end" : "\\*\\)",
                    "patterns" : []
                }
            ]
        },

        "list-cons": {
            "match": "::",
            "name": "keyword.operator.cons.mligo"
        },

        "control-keywords": {
            "name": "keyword.control.mligo",
            "match": "\\b(match|with|if|then|else|assert|failwith)\\b"
        },

        "other-keywords": {
            "name": "keyword.other.mligo",
            "match": "\\b(in|begin|end)\\b"
        },

        "numeric-literals": {
            "name": "constant.numeric.mligo",
            "match": "\\b\\d+"
        },

        "operators": {
            "name": "keyword.operator.other.mligo",
            "match": "([-+*/])"
        },

        "function-application": {
            "comment": "We need a negative lookahead here because instead of matching the first rule, TM picks the _longest match_. Without the lookahead, this rule conflicts with #let-binding and #control-keywords.",
            "match": "(?<=(?:match|with|if|then|else|assert|in|begin|failwith) |->|^|[|=\\.(])\\s*((?!(?:match|with|if|then|else|assert|in|begin|end|let|type|fun|failwith)\\b)[a-zA-Z_]\\w*)\\s+(?=(\\d|[\\[('\"]|[a-zA-Z_]\\w*))",
            "captures": {
                "1": { "name": "entity.name.function" }
            }
        },
        "identifiers": {
            "match": "\\b([a-zA-Z_]\\w*)\\b",
            "captures": {
                "1": { "name": "entity.name.variable" }
            }
        }
    },
    "scopeName": "source.mligo"
}