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build-monarch.js
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build-monarch.js
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/**
* Copyright (c) 2018, WSO2 LLC. (http://www.wso2.org) All Rights Reserved.
*
* WSO2 LLC. licenses this file to you under the Apache License,
* Version 2.0 (the 'License'); you may not use this file except
* in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing,
* software distributed under the License is distributed on an
* 'AS IS' BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
* KIND, either express or implied. See the License for the
* specific language governing permissions and limitations
* under the License.
*/
const fs = require('fs');
const path = require('path');
const yaml = require('js-yaml');
const inFile = path.join(__dirname, 'syntaxes', 'ballerina.YAML-tmLanguage');
const outFile = path.join(__dirname, 'syntaxes', 'ballerina.monarch.json');
const inText = fs.readFileSync(inFile, 'utf-8');
grammar = yaml.safeLoad(inText);
const variables = Object.assign({}, grammar.monarchVariables, grammar.variables);
Object.keys(variables).forEach(name => {
setVariable(grammar, {name, value: variables[name]});
});
delete grammar.variables;
delete grammar.tmlVariables;
delete grammar.monarchVariables;
// We can't convert the keywords highlighting from the yaml file due to what seems
// to be a bug in monaco. Its reported here. https://github.com/Microsoft/monaco-editor/issues/890
// For now keywords entry is manually added.
const exceptions = [];
const patterns = grammar.patterns;
const monarch = {};
convert(grammar, grammar.patterns, monarch, 'root');
// Following is manually adding keywords
monarch.code.push(['[a-z][\\w$]*', 'identifier']);
fs.writeFileSync(outFile, JSON.stringify(monarch, null, 4));
function setVariable(grammar, variable) {
const rules = Object.keys(grammar.repository);
rules.forEach(rule => {
replace(grammar.repository[rule], variable);
});
}
function replace(rule, variable) {
const properties = Object.keys(rule);
properties.forEach(prop => {
if (typeof rule[prop] === 'string') {
const newR = rule[prop].replace(new RegExp(`{{${variable.name}}}`, "gim"), variable.value);
rule[prop] = newR;
}
if (typeof rule[prop] === 'object') {
replace(rule[prop], variable);
}
});
}
function convert(grammar, patterns, monarch, targetKey) {
if (monarch[targetKey]) {
return;
}
let beginRuleCount = 0;
monarch[targetKey] = [];
patterns.forEach(pattern => {
if (pattern.include) {
let { include } = pattern;
if (pattern.include.startsWith('#')) {
include = include.replace('#', '');
}
if (exceptions.includes(include)) {
return;
}
const subrule = grammar.repository[include];
if (!subrule) {
console.log(`${include} is not found`);
}
monarch[targetKey].push({include});
convert(grammar, subrule.patterns, monarch, include, targetKey);
return;
}
if (pattern.begin) {
let ruleName = targetKey + '__b__' + beginRuleCount;
beginRuleCount++;
if (pattern.beginCaptures) {
ruleObj = convertCaptures(pattern.beginCaptures, monarch[targetKey], pattern.begin, ruleName);
} else {
let ruleObj = {
next: ruleName,
token: ''
};
monarch[targetKey].push([pattern.begin, ruleObj]);
}
if (pattern.patterns) {
convert(grammar, pattern.patterns, monarch, ruleName);
} else if (pattern.name) {
monarch[ruleName] = [['.', pattern.name]];
} else {
monarch[ruleName] = [];
}
if (pattern.end) {
if (pattern.endCaptures) {
convertCaptures(pattern.endCaptures, monarch[ruleName], pattern.end, '@pop');
} else {
monarch[ruleName].unshift([pattern.end, {
next: '@pop',
token: ''
}]);
}
}
return;
}
if (pattern.match) {
let token = pattern.name;
if (pattern.captures) {
token = Object.keys(pattern.captures).map((key) => (pattern.captures[key].name));
}
monarch[targetKey].push([pattern.match, token]);
return;
}
});
}
function convertCaptures(captures, target, pattern, next) {
if (captures['0']) {
target.unshift([pattern, {
next,
token: captures[0].name
}]);
return;
}
if (captures['1']) {
const subRegexes = splitToGroups(pattern);
if (subRegexes.length > 1) {
subRegexes.forEach((subRegex, i) => {
const ruleObj = {
next,
token: (captures[i+1] && captures[i+1].name) || ''
}
target.unshift([subRegexes[i], ruleObj]);
});
return;
}
const ruleObj = [
{
next,
token: captures['1'].name
}
];
Object.keys(captures).map(cap => {
if (cap === '1') {
return;
}
ruleObj.push(captures[cap].name);
});
target.unshift([subRegexes[0], ruleObj]);
}
}
// splits a regex joined by | into its sub groups
function splitToGroups(regex) {
if (regex.indexOf(')|(') < 0) {
return [regex];
}
let openCount = 0;
let closeCount = 0;
const groups = [];
let start = 0;
const charArr = [...regex];
charArr.forEach((char, i) => {
if (char === '(') {
openCount++;
return;
}
if (char === ')') {
closeCount++;
return;
}
if (char === '|') {
if ((charArr[i+1] === '(') && (charArr[i-1] === ')') && (openCount === closeCount)) {
groups.push(regex.substring(start, i));
start = i+1;
}
}
})
groups.push(regex.substring(start));
return groups;
}