c81ce33a4b
Task 6 of v0.3 plan (parser + pump class; full --live-values CLI
wiring is Task 7).
parseVarNames(text) extracts variable names from any VAR /
VAR_INPUT / VAR_OUTPUT / VAR_GLOBAL / etc. block. Handles:
- one name per declaration line
- 'AT %QX0.1' location prefix
- := initializer
- inline (* ... *) and // line comments
- multi-line (* ... *) blocks (state threaded across lines)
Doesn't handle the multi-name shorthand 'a, b : INT;' -- vanishingly
rare in practice, cost of getting it wrong is just a missing overlay.
LiveValuesPump owns a setInterval. Each tick:
- reads tui-state.json via the injected readSelection
- reads the POU's .st file from the mirror
- parseVarNames -> per-var read_variable round-trip (errors per-var
are silent, others may succeed)
- writeLiveValues snapshot
Reentrancy guard: if a tick is still in flight when the next
interval fires, skip the new tick rather than queueing. Errors at any
layer are swallowed -- pump must never crash the server.
start()/stop() lifecycle so the server can hand it to the existing
shutdown path.
57 lines
1.5 KiB
TypeScript
57 lines
1.5 KiB
TypeScript
import { describe, it, expect } from 'vitest';
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import { parseVarNames } from '../../src/live-values-pump';
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describe('parseVarNames', () => {
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it('extracts vars from a single VAR block', () => {
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const text = [
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'PROGRAM PLC_PRG',
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'VAR',
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' counter : INT := 0;',
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' bRunning : BOOL;',
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' rTemperature : REAL;',
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'END_VAR',
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].join('\n');
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expect(parseVarNames(text)).toEqual(['counter', 'bRunning', 'rTemperature']);
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});
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it('handles VAR_INPUT / VAR_OUTPUT / VAR_GLOBAL too', () => {
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const text = [
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'FUNCTION_BLOCK FB_X',
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'VAR_INPUT',
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' x : INT;',
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'END_VAR',
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'VAR_OUTPUT',
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' y : BOOL;',
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'END_VAR',
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'VAR',
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' internal : DINT;',
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'END_VAR',
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].join('\n');
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expect(parseVarNames(text).sort()).toEqual(['internal', 'x', 'y']);
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});
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it('ignores lines inside (* ... *) blocks and after //', () => {
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const text = [
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'VAR',
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' alpha : INT;',
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' (* commentedOut : BOOL; *)',
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' beta : INT; // tail comment',
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'END_VAR',
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].join('\n');
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expect(parseVarNames(text)).toEqual(['alpha', 'beta']);
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});
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it('returns [] when no VAR block is present', () => {
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expect(parseVarNames('PROGRAM X\nEND_PROGRAM')).toEqual([]);
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});
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it('handles AT %X10.0 location prefix and := initializer', () => {
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const text = [
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'VAR',
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' bRelay AT %QX0.1 : BOOL := FALSE;',
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' iCount : INT := 42;',
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'END_VAR',
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].join('\n');
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expect(parseVarNames(text)).toEqual(['bRelay', 'iCount']);
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});
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});
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