57 lines
1.9 KiB
JavaScript
57 lines
1.9 KiB
JavaScript
import * as CF from '@efforting.tech/data/field-configuration-factories';
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export const Indention_Mode = new CF.symbol_set({
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AUTO: 'Automatic detection of indention mode',
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SPACES: 'Indention is based on spaces',
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TABULATORS: 'Indention is based on tabulators',
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}, 'Indention mode');
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// BUG: Current implementation of CF.symbol_set doesn't support default value
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export const Text_Settings = new CF.Schema({
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indention_mode: Indention_Mode,
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indention_tabulator_width: CF.cardinal_value(4, 'Width of a tabulator in spaces'),
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first_line: CF.natural_value(1, 'First line number'),
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}, 'Text settings');
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export function string_has_contents(str) {
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return /\S/.test(str);
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}
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export function parse_csv(str) {
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// NOTE: This is for simple comma separated values, a future RFC-4180 compatible version would have to be in a different module in this library (or be a third party thing)
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return str.split(',').map(element => element.trim());
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}
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export function *indented_line_iterator(settings, text) {
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let line_no = settings.first_line;
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let index = 0;
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const { indention_tabulator_width } = settings;
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switch (settings.indention_mode) {
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case Indention_Mode.symbols.TABULATORS: {
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for (const line of text.matchAll(/^(\t*)(.*)$/gm)) {
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const [raw, tabs, remaining] = line;
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yield { raw, indent: tabs.length, line: remaining, line_no: line_no++, index: index++};
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}
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break;
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}
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case Indention_Mode.symbols.SPACES: {
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for (const line of text.matchAll(/^([ ]*)(.*)$/gm)) {
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const [raw, spaces, remaining] = line;
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if ((spaces.length % indention_tabulator_width) !== 0) {
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throw new Error('Unaligned indention'); //TODO - proper error
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}
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yield { raw, indent: Math.floor(spaces.length / indention_tabulator_width), line: remaining, line_no: line_no++, index: index++};
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}
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break;
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}
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default:
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throw new Error(`Unsupported indention mode: ${settings.indention_mode}`); //TODO - proper error
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}
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}
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