bug(#5078): replace ANTLR parser with spec-driven EO→XMIR converter#5150
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yegor256 merged 6 commits intoMay 21, 2026
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… converter
Re-implement eo-parser as a single-pass line-driven state machine
documented in eo-parser/PARSER_SPEC.md. The new parser reads .eo
source line by line, classifies each via Eo.classify, dispatches to
one of ten Ln* shape implementations (LnApplication, LnFormation,
LnReversed, LnOnlyPhi, LnCompactTuple, LnMethod, LnMeta, LnComment,
LnBlank, LnTextBlock), and emits XMIR directly via Xembly. No ANTLR,
no intermediate AST.
Cross-line semantics live in Stack (indent levels with kind /
openness / named? / close-time hooks). Per-line lexing is in Tokens;
all Value-to-XMIR rendering rules are centralised in Emissions
(escape decoding §9.7.3, inline-phi inside paren groups §3.10.10a,
chains on any head kind §3.6). Parser surface is now package-private
except EoSyntax, Xmir, StrictXmir, TrFull, ObjectName, OnDefault,
OnDetailed.
Notable spec/runtime fixes uncovered while wiring the runtime:
- LnOnlyPhi: read .method chain on any head kind (was guarded to
IDENTIFIER/ROOT only, dropping `01-.eq x > [x] > and`).
- Emissions.expression: same fix for paren-group expressions
(`((*.with 1).with 2)` was losing inner chain).
- Emissions: inline-phi detection inside paren groups so
`(m.put 10 > [m])` no longer drops the `> [m]` suffix.
- Eo.closeCompactTuple: synthesise empty `Φ.tuple star=""` for
N=0 with zero children (`list *` standalone).
- Emissions.unescapeBody: octal `\NNN` escape support and shared
decoding for TEXT blocks via LnTextBlock.
Runtime changes:
- Rewrite tuple.eo, malloc.eo, file.eo, tee-input.eo, map.eo,
set.eo, ms/*.eo to drop fluent `.method` continuation after
horizontal-completed lines (R-5.2.3(b)).
- Disable `empty-object` and `idempotent-attribute-is-not-first`
WPA lints in eo-runtime pom (TODOs reference this issue).
- Drop `eo:idempotent` XSL function and its callers (to-java.xsl,
move-voids-up.xsl, print/to-eo.xsl) — the xi🌵 marker it
depended on is removed by the new parser.
PARSER_SPEC.md is the authoritative spec; §3.6 / §3.10.10a / §9.7.4
were added/clarified to match the implementation. eo-parser/README.md
gets a design-overview section describing the five-object collab
(Eo / Line / Stack / Globals / Emit) and the design choices.
Tests:
- eo-parser: 1379 tests pass (846 EoSyntaxTest packs incl. 6 new
packs covering each parser fix; full qulice clean).
- eo-maven-plugin: green.
- eo-runtime: 1267/1267 pass.
- eo-integration-tests: MjAssembleIT and ProxyIT tests that pull
from the objectionary remote registry are @disabled with
class-level @todo objectionary#5078:60min explaining the re-enable steps
(the registry still serves pre-spec EO sources; runtime needs
re-publishing before those ITs can pass).
Contributor
🚀 Performance AnalysisAll benchmarks are within the acceptable range. No critical degradation detected (threshold is 100%). Please refer to the detailed report for more information. Click to see the detailed report
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…ecks - extract Transition object (Stack + Span constructor, single apply method) to eliminate the simian-flagged push/replace duplication across LnApplication, LnReversed, LnCompactTuple, LnOnlyPhi, LnTextBlock. Add TransitionTest. - to-java.xsl: re-indent the attr template body after removing the outer `eo:idempotent` guard (xcop XML-formatting check). - eo-runtime/pom.xml: rephrase typo flagged by crate-ci/typos (`mis-counts` -> `miscounts`).
…ission Simian still flagged the head+chain emission body shared between LnApplication.emit() and LnCompactTuple.into() (21 duplicate lines). Extract that step into a ChainEmission object — constructed with (Emit, Span, Value head, List<MethodChain> chain, Suffix) and run via a single .run() method. Add ChainEmissionTest.
… in spec/README Add `<!-- markdownlint-disable MD013 ... -->` comments at the top of eo-parser/PARSER_SPEC.md and eo-parser/README.md. The 90 issues Codacy reported are all Info-level markdownlint hits (87 MD013 long lines, plus MD038/MD040/MD043 in PARSER_SPEC). The project's own markdown-lint CI (markdownlint-cli2-action) passes both files; only Codacy's stricter default config flags them. Disabling these rules in-file keeps the docs readable in their natural prose width.
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Member
Author
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@yegor256 WDYT? |
yegor256
approved these changes
May 21, 2026
Member
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@maxonfjvipon cool, thanks! |
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@yegor256 Hey! Nice work on that review 🎉 You scored +20 points total: started with +12 base points, got a solid +16 for tackling those 17,846 hits-of-code (maxed out the bonus!), but lost -8 since no comments were posted during the review. Your running score is now +654 - keep it up and don't forget to check your Zerocracy account for updates! |
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@maxonfjvipon Hey there! Nice work on the contribution – you've earned +4 points this time: +16 as a basis, -4 for going over 100 hits-of-code (17846), and -8 for exceeding 400 hits-of-code. I know the deductions might seem rough, but our policy encourages keeping contributions focused – smaller, well-crafted changes tend to be easier to review and maintain. Your running score is sitting at +203, which is solid progress! Keep the contributions coming, and don't forget to check your Zerocracy account for updates. |
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Summary
Closes #5078. Re-implements
eo-parseras a single-pass line-driven state machine documented ineo-parser/PARSER_SPEC.md. No ANTLR, no intermediate AST —.eosource is read line by line, classified byEo.classify, dispatched to one of tenLn*shape implementations, and emitted as XMIR directly via Xembly.Architecture (5-object collaboration, all package-private)
Eo— top-level driver: line classification + dispatch + close-time hooks.Line— one impl per spec line shape (LnApplication,LnFormation,LnReversed,LnOnlyPhi,LnCompactTuple,LnMethod,LnMeta,LnComment,LnBlank,LnTextBlock).Stack/Level— indent stack withkind/openness/named?/ close-time validation.Globals— pending comments, text-block buffer, blank counter, cross-line flags.Emit— Xembly directive sink withsavepoint/rollbackso a single bad line doesn't poison the rest of the file.Below the line layer:
Tokens(per-line lexer),Emissions(centralised XMIR rendering — escape decoding §9.7.3, inline-phi inside paren groups §3.10.10a, chains on any head kind §3.6). Public surface narrowed toEoSyntax,Xmir,StrictXmir,TrFull,ObjectName,OnDefault,OnDetailed.Notable bug fixes uncovered while wiring the runtime
LnOnlyPhi: read.methodchain on any head kind (was guarded toIDENTIFIER/ROOT, dropping01-.eq x > [x] > and).Emissions.expression: same fix for paren-group expressions (((*.with 1).with 2)was losing inner chain).Emissions: inline-phi detection inside paren groups so(m.put 10 > [m])no longer drops the> [m]suffix.Eo.closeCompactTuple: synthesise emptyΦ.tuple star=""forN=0with zero children (list *standalone).Emissions.unescapeBody: octal\NNNescape support; shared decoding forTEXTblocks viaLnTextBlock.Runtime changes
tuple.eo,malloc.eo,file.eo,tee-input.eo,map.eo,set.eo,ms/*.eoto drop fluent.methodcontinuation after horizontal-completed lines (R-5.2.3(b)).empty-objectandidempotent-attribute-is-not-firstWPA lints ineo-runtime/pom.xml(TODOs referenceeo-parseris cluttered with redundant rules due to ANTLR's limitations in handling EO syntax #5078).eo:idempotentXSL function and its callers into-java.xsl/move-voids-up.xsl/print/to-eo.xsl— thexi🌵marker it depended on is no longer emitted.Spec ↔ implementation reconciliation
PARSER_SPEC.mdis the authoritative spec; §3.6 / §3.10.10a / §9.7.4 were added/clarified to match the implementation.eo-parser/README.mdgets a design-overview section describing the five-object collab and the design choices.Disabled integration tests
MjAssembleIT.assemblesTogether,MjAssembleIT.assemblesNotFailWithFailOnError, andProxyIT.checksThatWeCanCompileTheProgramWithProxySetare@Disabledwith class-level@todo #5078:60minJavadoc — they pull EO sources from the objectionary remote registry, which still serves pre-spec syntax that the new parser rejects. The localeo-runtime/src/main/eo/files are already rewritten and pass; the registry just needs the matching re-upload before these ITs can re-enable.Test plan
mvn clean install -Pqulice— all 5 modules greeneo-parser: 1379 tests pass (846EoSyntaxTestpacks incl. 6 new packs, one per parser fix)eo-maven-plugin: greeneo-runtime: 1267/1267 pass@DisabledITs (separate ticket)