pineforge-codegen

PineScript v6 → C++ transpiler that emits against the pineforge-engine runtime.

A pure-Python library that turns a PineScript v6 strategy into a complete C++ source file you can compile against the pineforge-engine runtime — a deterministic native backtester validated trade-for-trade against TradingView (231/232 corpus parity).

It is source-available and free for personal trading — research, backtest, and trade your own account with your own capital at no cost. See License for the line between personal and commercial use.

• Pure Python, zero runtime dependencies — one function, transpile().
• Fails loud, never silent — a support checker rejects Pine the engine can't faithfully run before codegen, with a file:line:col error. You never get silently-wrong C++.
• First complete PineScript v6 → C++ transpiler with a real support checker (to our knowledge).

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Install

pip install pineforge-codegen

Requires Python ≥ 3.11. No runtime dependencies.

From source (development / contributing):

git clone https://github.com/pineforge-4pass/pineforge-codegen-oss.git
cd pineforge-codegen-oss
pip install -e ".[dev]"

Quick start

from pineforge_codegen import transpile

pine = """
//@version=6
strategy("SMA cross", overlay=true)
fast = ta.sma(close, 10)
slow = ta.sma(close, 30)
if ta.crossover(fast, slow)
    strategy.entry("long", strategy.long)
if ta.crossunder(fast, slow)
    strategy.close("long")
"""

cpp = transpile(pine)
print(cpp)          # complete C++ source string

The output #includes <pineforge/engine.hpp>, <pineforge/ta.hpp>, … and compiles into a .so exposing the engine's documented C-ABI.

Usage

The transpile() function

transpile(
    pine_source: str,
    *,
    check_support: bool = True,   # run the support checker before codegen
    filename: str = "<input>",    # name used in error locations
) -> str

Returns the generated C++ source as a string. Raises pineforge_codegen.errors.CompileError on any unsupported construct or syntax error.

Transpile a file to a .cpp

from pathlib import Path
from pineforge_codegen import transpile

pine = Path("strategy.pine")
cpp = transpile(pine.read_text(), filename=pine.name)   # filename → better errors
Path("strategy.generated.cpp").write_text(cpp)

Handle unsupported features

The support checker raises a CompileError with the exact source location instead of emitting broken C++:

from pineforge_codegen import transpile
from pineforge_codegen.errors import CompileError

try:
    transpile('//@version=6\nindicator("x")\n')
except CompileError as e:
    print(e)
    # <input>:2:1: indicator() declarations are not supported; PineForge runs strategies only.

try:
    transpile('//@version=6\nstrategy("x")\n'
              'x = request.financial("AAPL", "REV", "FQ")\n')
except CompileError as e:
    print(e)
    # <input>:3:22: request.financial(...) is not supported.

Pass filename= so the location points back at the user's file:

transpile(src, filename="my_strategy.pine")
# raises e.g.  my_strategy.pine:12:5: ...

Skip the support checker

check_support=False bypasses the gate (intended only for tests of legacy fixtures — it can produce C++ the engine won't accept):

cpp = transpile(src, check_support=False)

Trace intermediate expressions (@pf-trace)

A // @pf-trace name=expr comment makes the engine emit name's per-bar value in the backtest report — useful for debugging parity against TradingView:

pine = """
//@version=6
strategy("traced")
// @pf-trace rsi=ta.rsi(close, 14)
e = ta.ema(close, 20)
if close > e
    strategy.entry("L", strategy.long)
"""
cpp = transpile(pine)   # emitted on_bar tail records `rsi` each bar

Advanced: run the pipeline stages directly

transpile() is a thin wrapper over five passes. Drive them yourself to inspect tokens, the AST, or the analyzer context:

from pineforge_codegen import (
    Lexer, Parser, Analyzer, CodeGen,
    extract_pf_trace_pragmas, check_support_or_raise,
)

src = open("strategy.pine").read()
pragmas = extract_pf_trace_pragmas(src)
tokens  = Lexer(src, filename="strategy.pine").tokenize()
ast     = Parser(tokens, source=src, filename="strategy.pine").parse()
check_support_or_raise(ast, filename="strategy.pine")
ctx     = Analyzer(ast, filename="strategy.pine").analyze()
ctx.pf_trace_pragmas = pragmas
cpp     = CodeGen(ctx).generate()

How it works

transpile() runs five passes, in order:

pine source
  │
  ├─ 1. extract_pf_trace_pragmas   // @pf-trace comments pulled out first
  ├─ 2. Lexer → Parser             token stream → Pine v6 AST
  ├─ 3. support_checker            reject anything the engine can't run faithfully
  ├─ 4. Analyzer                   type inference, scope resolution, TA bookkeeping
  └─ 5. CodeGen                    → C++ source string

Compile & run against the engine

The emitted C++ targets the C-ABI in <pineforge/pineforge.h>. To build and run a strategy:

# Get the runtime (Apache-2.0) next to this repo
git clone https://github.com/pineforge-4pass/pineforge-engine.git

Follow the engine's tutorial/ to build libpineforge.a, compile your transpiled .cpp into a strategy .so, feed it OHLCV, and read back the closed-trade list. The codegen version must target a matching engine ABI (see VERSION).

Prefer no local build? A hosted transpile API + MCP server is available so AI agents can transpile and backtest for you — see https://www.pineforge.dev.

Running tests

pip install -e ".[dev]"
pytest

The pure-transpiler suite is fast (< 1 s) and has no native dependencies — it checks token streams, parse trees, analyzer output, and canonical C++ strings without invoking a C++ compiler.

Opt-in compile checks (tests/test_compile_smoke.py, tests/test_compile_corpus.py) run g++ -fsyntax-only on transpiled C++ against the engine headers. They auto-detect a sibling ../pineforge-engine checkout, or set the path explicitly:

export PINEFORGE_ENGINE_INCLUDE=/path/to/pineforge-engine/include
pytest

Without an engine checkout these tests skip cleanly, so CI stays green.

License

Source-available under the PolyForm Noncommercial License 1.0.0, with two supplemental terms (the LICENSE file is the controlling text):

• Personal Trading exception — free to research, backtest, and trade for your own account with your own capital.
• Commercial use — companies, funds, managing third-party capital, embedding in a product, or operating a hosted / public-facing service requires a commercial license.

Competing hosted services are not permitted under the noncommercial terms. This is source-available, not OSI open source.

Buying a commercial license

Commercial licenses are available — flexible terms for funds, products, and hosted/embedded use. Email luis@4pass.com.tw with your use case for a quote.