Notes/libraries/codemirror/hcl.js

// Source: https://github.com/codemirror/codemirror5/pull/7080/files

// CodeMirror, copyright (c) by Marijn Haverbeke and others
// Distributed under an MIT license: https://codemirror.net/5/LICENSE

(function (mod) {
    if (typeof exports == "object" && typeof module == "object") // CommonJS
        mod(require("../../lib/codemirror"));
    else if (typeof define == "function" && define.amd) // AMD
        define(["../../lib/codemirror"], mod);
    else // Plain browser env
        mod(CodeMirror);
})(function (CodeMirror) {
    "use strict";

    CodeMirror.defineMode("hcl", function (config) {
        var indentUnit = config.indentUnit;

        var keywords = {
            "resource": true,
            "variable": true,
            "output": true,
            "module": true,
            "provider": true,
            "data": true,
            "locals": true,
            "terraform": true,
            "if": true,
            "else": true,
            "for": true,
            "foreach": true,
            "in": true,
            "true": true,
            "false": true,
            "null": true,
        };

        var atoms = {
            "true": true,
            "false": true,
            "null": true,
        };

        var isOperatorChar = /[+\-*&^%:=<>!|\/]/;

        var curPunc;

        function tokenBase(stream, state) {
            var ch = stream.next();
            if (ch == '"' || ch == "'" || ch == "`") {
                state.tokenize = tokenString(ch);
                return state.tokenize(stream, state);
            }
            if (/[\d\.]/.test(ch)) {
                if (ch == ".") {
                    stream.match(/^[0-9_]+([eE][\-+]?[0-9_]+)?/);
                } else {
                    stream.match(/^[0-9_]*\.?[0-9_]*([eE][\-+]?[0-9_]+)?/);
                }
                return "number";
            }
            if (/[\[\]{}\(\),;\:\.]/.test(ch)) {
                curPunc = ch;
                return null;
            }
            if (ch == "/") {
                if (stream.eat("*")) {
                    state.tokenize = tokenComment;
                    return tokenComment(stream, state);
                }
                if (stream.eat("/")) {
                    stream.skipToEnd();
                    return "comment";
                }
            }
            if (isOperatorChar.test(ch)) {
                stream.eatWhile(isOperatorChar);
                return "operator";
            }
            stream.eatWhile(/[\w\$_\xa1-\uffff]/);
            var cur = stream.current();
            if (keywords.propertyIsEnumerable(cur)) {
                return "keyword";
            }
            if (atoms.propertyIsEnumerable(cur)) return "atom";
            return "variable";
        }

        function tokenString(quote) {
            return function (stream, state) {
                var escaped = false,
                    next,
                    end = false;
                while ((next = stream.next()) != null) {
                    if (next == quote && !escaped) {
                        end = true;
                        break;
                    }
                    escaped = !escaped && quote != "`" && next == "\\";
                }
                if (end || !(escaped || quote == "`"))
                    state.tokenize = tokenBase;
                return "string";
            };
        }

        function tokenComment(stream, state) {
            var maybeEnd = false,
                ch;
            while (ch = stream.next()) {
                if (ch == "/" && maybeEnd) {
                    state.tokenize = tokenBase;
                    break;
                }
                maybeEnd = (ch == "*");
            }
            return "comment";
        }

        function Context(indented, column, type, align, prev) {
            this.indented = indented;
            this.column = column;
            this.type = type;
            this.align = align;
            this.prev = prev;
        }
        function pushContext(state, col, type) {
            return state.context = new Context(state.indented, col, type, null, state.context);
        }
        function popContext(state) {
            if (!state.context.prev) return;
            var t = state.context.type;
            if (t == ")" || t == "]" || t == "}")
                state.indented = state.context.indented;
            return state.context = state.context.prev;
        }

        // Interface

        return {
            startState: function (basecolumn) {
                return {
                    tokenize: null,
                    context: new Context((basecolumn || 0) - indentUnit, 0, "top", false),
                    indented: 0,
                    startOfLine: true
                };
            },

            token: function (stream, state) {
                var ctx = state.context;
                if (stream.sol()) {
                    if (ctx.align == null) ctx.align = false;
                    state.indented = stream.indentation();
                    state.startOfLine = true;
                }
                if (stream.eatSpace()) return null;
                curPunc = null;
                var style = (state.tokenize || tokenBase)(stream, state);
                if (style == "comment") return style;
                if (ctx.align == null) ctx.align = true;

                if (curPunc == "{") pushContext(state, stream.column(), "}");
                else if (curPunc == "[") pushContext(state, stream.column(), "]");
                else if (curPunc == "(") pushContext(state, stream.column(), ")");
                else if (curPunc == "}" && ctx.type == "}") popContext(state);
                else if (curPunc == ctx.type) popContext(state);
                state.startOfLine = false;
                return style;
            },

            indent: function (state, textAfter) {
                if (state.tokenize != tokenBase && state.tokenize != null) return CodeMirror.Pass;
                var ctx = state.context, firstChar = textAfter && textAfter.charAt(0);
                if (firstChar == "#" || firstChar == ";") return 0;
                if (stream.sol()) {
                    if (ctx.type == "case" && /^(?:case|default)\b/.test(textAfter)) {
                        state.context.type = "}";
                        return ctx.indented;
                    }
                    var closing = firstChar == ctx.type;
                    if (ctx.align) return ctx.column + (closing ? 0 : 1);
                    else return ctx.indented + (closing ? 0 : indentUnit);
                }
            },

            electricChars: "{}):",
            closeBrackets: "()[]{}''\"\"``",
            fold: "brace",
            blockCommentStart: "/*",
            blockCommentEnd: "*/",
            lineComment: "//"
        };
    });

    CodeMirror.defineMIME("text/x-hcl", "hcl");
    CodeMirror.modeInfo.push({
        ext: [ "hcl " ],
        mime: "text/x-hcl",
        mode: "hcl",
        name: "Terraform (HCL)"
    });

});