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tokenizer.js
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tokenizer.js
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import {REGEX} from './regex.js'
export {Tokenizer};
const KEYWORDS = new Set(['if', 'else', 'while', 'def', 'return', 'and', 'or', 'not',
'new', 'class', 'this', 'arguments', 'throw', 'try', 'catch',
'nonlocal', 'switch', 'case', 'default', 'break', 'import', 'as', 'from']);
const TOKEN_TESTERS = new Map([
['importAs', function(input) {
const matched = REGEX.get('importAs').exec(input);
return matched ? [matched[1], matched[2], matched[4]] : [];
}],
['fromImport', function(input) {
const matched = REGEX.get('fromImport').exec(input);
return matched ? [matched[1], matched[2], matched[4]] : [];
}],
['text', function(input) {
const matched = REGEX.get('text').exec(input);
return matched ? [matched[1]] : [];
}],
['number', function(input) {
const matched = REGEX.get('number').exec(input);
return matched ? [input] : [];
}],
['boolean', function(input) {
const matched = REGEX.get('boolean').exec(input);
return matched ? [input] : [];
}],
['variable', function(input) {
const matched = REGEX.get('variable').exec(input);
return matched ? [input] : [];
}],
['fcall', function(input) {
const matched = REGEX.get('fcall').exec(input);
return matched ? [matched[2], matched[3]] : [];
}],
['expression', function(input) {
return expr_tokens(input);
}],
['lambda', function(input) {
const matched = REGEX.get('lambda').exec(input);
return matched ? [matched[2]].concat(
matched[1].startsWith('(') ?
matched[1].slice(1, -1).split(',').map(p => p.trim())
: [matched[1]]
) : [];
}],
['iife', function(input) {
const matched = REGEX.get('iife').exec(input);
return matched ? [matched[1], matched[4]] : [];
}],
['func', function(input) {
const matched = REGEX.get('func').exec(input);
return [matched[1]].concat(matched[2] ? matched[2].split(/,\s*/) : []);
}],
['variableAssign', function(input) {
const matched = REGEX.get('variableAssign').exec(input);
return matched ? [matched[1], matched[2], matched[3]] : [];
}],
['nonlocalAssign', function(input) {
const matched = REGEX.get('nonlocalAssign').exec(input);
return matched ? [matched[1], matched[2], matched[3]] : [];
}],
['propertyAssign', function(input) {
const matched = REGEX.get('propertyAssign').exec(input);
if(matched) {
return matched.slice(1);
}
return [];
}],
['cmd-arg', function(input) {
const matched = REGEX.get('cmd-arg').exec(input);
return matched ? [matched[1], matched[2]] : [];
}],
['return', function(input) {
const matched = REGEX.get('return').exec(input);
return matched ? [matched[1]] : [];
}],
['throw', function(input) {
const matched = REGEX.get('throw').exec(input);
return matched ? [matched[1]] : [];
}],
['else', function(input) {
const matched = REGEX.get('else').exec(input);
return matched ? matched : [];
}],
['case', function(input) {
const matched = REGEX.get('case').exec(input);
if(matched[1]) {
return splitByComma(matched[1]).map(elem => elem.trim());
}
return [];
}],
['try', function(input) {
const matched = REGEX.get('try').exec(input);
return matched ? matched : [];
}],
['catch', function(input) {
const matched = REGEX.get('catch').exec(input);
return matched ? [matched[1]] : [];
}],
['argLists', function(input) {
return argLists(input);
}],
['list', function(input) {
return listElems(input).map(elem => elem.trim());
}],
['args', function(input) {
return funcArguments(input);
}],
['break', function(input) {
const matched = REGEX.get('break').exec(input);
return matched ? matched : [];
}],
['ternary', function(input) {
const matched = REGEX.get('ternary-bare').exec(input) || REGEX.get('ternary-parentheses').exec(input);
if(matched) {
return [matched[1], matched[2], matched[3]];
}
return [];
}]
]);
function argLists(input) {
const matched = REGEX.get('argList').exec(input);
if(matched) {
return [matched[0]].concat(argLists(input.slice(matched[0].length)));
}
return [];
}
function expr_tokens(input) {
const matched = REGEX.get('expression').exec(input);
if(matched) {
const token = matched[1];
return [token].concat(expr_tokens(input.slice(token.length).trim()));
}
else {
return [];
}
}
function funcArguments(input) {
const matched = REGEX.get('argList').exec(input);
if(matched[1]) {
return splitByComma(matched[1]);
}
return [];
}
function listElems(input) {
const matched = REGEX.get('elemList').exec(input);
if(matched) {
return matched[1] === '' ? [''] : splitByComma(matched[1].trim());
}
return [];
}
function splitByComma(input, x = '', acc = []) {
if(input === '') {
return acc.concat([x.trim()]);
}
const matched = REGEX.get('commaSeperated').exec(input);
if(matched) {
const token = matched[1];
return token === ',' ? splitByComma(input.slice(token.length).trim(), '', acc.concat([x.trim()])) :
tokenBetweenComma(token, input, x, acc);
}
else {
return [];
}
}
function tokenBetweenComma(token, input, x, acc) {
if(REGEX.get('lambda').exec(token)) {
const arrowIdx = token.indexOf('->');
const lambda = token.substring(0, arrowIdx) + '->' + lambdaBody(token.substring(arrowIdx + 2));
return splitByComma(input.slice(lambda.length).trim(), x + lambda + ' ', acc);
}
return splitByComma(input.slice(token.length).trim(), x + token + ' ', acc);
}
function lambdaBody(input, body = '') {
const trimStarted = input.trimStart();
const space = ' '.repeat(input.length - trimStarted.length);
const matched = REGEX.get('expression').exec(trimStarted);
if(matched) {
return lambdaBody(trimStarted.substring(matched[0].length), body + space + matched[0]);
}
return body;
}
class Tokenable {
constructor(type, lineNumber, value) {
this.type = type;
this.lineNumber = lineNumber;
this.value = value;
}
tryTokenables(type) {
return TOKEN_TESTERS.get(type)(this.value).map(token => new Tokenable(type, this.lineNumber, token));
}
toString() {
return `${this.lineNumber}:${this.value}`;
}
syntaxErr(message) {
const err = new SyntaxError(message);
err.code = this.value;
err.lineNumber = this.lineNumber;
throw err;
}
errIfKeyword() {
if(KEYWORDS.has(this.value)) {
this.syntaxErr(`'${this.value}' is a keyword`);
}
}
errIfNoValue(v, message) {
if(!v) {
this.syntaxErr(message);
}
}
replaceValue(v) {
return new Tokenable(this.type, this.lineNumber, v);
}
}
/*
Matching single line comments except in a string
ref: https://stackoverflow.com/questions/8446064/java-regex-find-oracle-single-line-comments-except-in-a-string
^ # match the start of the line
( # start match group 1
(?: # start non-capturing group 1
(?!#|'). # if there's no '#' or single quote ahead, match any char
| # OR
'(?:''|[^'])*' # match a string literal
)* # end non-capturing group 1 and repeat it zero or more times
) # end match group 1
#.*$ # match a comment all the way to the end of the line
*/
class Tokenizer {
constructor(code) {
this.lines = concatExpr(
code.split('\n')
// a comment starts with #
.map(line => line.replace(/^((?:(?!#|').|'(?:''|[^'])*')*)\s*#.*$/, '$1')) // comment after a line
.map(line => line.trim())
.map((line, idx) => new Tokenable('line', idx + 1, line))
.filter(tokenizableLine => tokenizableLine.value !== '' && !tokenizableLine.value.startsWith("#"))
);
}
tokenizableLines() {
return this.lines;
}
}
function concatExpr(lines) {
if(lines.length === 0) {
return [];
}
if(lines[0].value.endsWith('\\')) {
const [line, i] = lineIdxBackSlash(lines);
return [new Tokenable('line', lines[0].lineNumber, line)].concat(concatExpr(lines.slice(i + 1)));
}
if(lines[0].value.startsWith('(')) {
const [lc, rc] = countParentheses(lines[0].value.split(''));
if(lc !== rc) {
const [line, i] = lineIdxParentheses(lines);
const tokenable = new Tokenable('line',
lines[0].lineNumber, line.trim().slice(1, -1).trim()
);
return [tokenable].concat(concatExpr(lines.slice(i + 1)));
}
}
return [lines[0]].concat(concatExpr(lines.slice(1)));
}
function lineIdxBackSlash(lines) {
function __lineIdx(line, i = 1) {
if(!lines[i].value.endsWith('\\')) {
return [line + ' ' + lines[i].value, i];
}
if(lines.length === i + 1) {
lines[i].syntaxErr('illegal cross-line backslash');
}
return __lineIdx(line + ' ' + lines[i].value.slice(0, -1).trim(), i + 1);
}
return __lineIdx(lines[0].value.slice(0, -1).trim());
}
function lineIdxParentheses(lines) {
function __lineIdx(line = '', lc = 0, rc = 0, i = 0) {
if(lines.length === i) {
lines[0].syntaxErr('unable to match parentheses');
}
// string regex /'((?:[^'\\]|\\'|\\\\|\\r|\\n|\\t)*)'/
// ignore parentheses in string first
const parentheses = countParentheses(lines[i].value.replace(/'((?:[^'\\]|\\'|\\\\|\\r|\\n|\\t)*)'/g, '').split(''));
const leftPCount = parentheses[0] + lc;
const rightPCount = parentheses[1] + rc;
if(leftPCount === rightPCount) {
return [line + lines[i].value + ' ', i];
}
return __lineIdx(line + lines[i].value + ' ', leftPCount, rightPCount, i + 1);
}
return __lineIdx();
}
function countParentheses(chars) {
const parentheses = chars.filter(c => c === '(' || c === ')')
.reduce((acc, c) => c === '(' ? [acc[0] + c, acc[1]] : [acc[0], acc[1] + c], ['', '']);
return [parentheses[0].length, parentheses[1].length];
}