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MINIMAL_GRAM_ISSUE.md

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Minimal Example: Multiline Gram Parsing Issue

Issue Description

When parsing gram notation with multiline format, a newline immediately after } | causes a parse error: "unexpected newline".

Minimal Failing Example

[test:Agent {
  description: "test"
} |
  [tool:Tool {description: "test"} | (param::Text)==>(::String)]
]

Error: gram:3:4: unexpected newline expecting '"', ''', '(', '-', '@', '[', '', '{', digit, space, or tab`

The error occurs at position 3:4, which is the newline character immediately after } |.

Working Single-line Version

[test:Agent {description: "test"} | [tool:Tool {description: "test"} | (param::Text)==>(::String)]]

This single-line version parses successfully.

Test Code

import qualified Gram
import qualified Data.Text as T

main = do
  let gramMultiline = T.unlines
        [ "[test:Agent {"
        , "  description: \"test\""
        , "} |"
        , "  [tool:Tool {description: \"test\"} | (param::Text)==>(::String)]"
        , "]"
        ]
  
  case Gram.fromGram (T.unpack gramMultiline) of
    Right _ -> putStrLn "Success"
    Left err -> putStrLn $ "Error: " ++ show err

Expected Behavior

The multiline format should parse successfully, as it's valid gram syntax according to gram-lint. The parser should handle newlines after } | when followed by pattern elements on subsequent lines.

Context

This issue was discovered when writing tests for pattern-agent that parse agents with nested tools from gram notation. The example file specs/003-hello-world-agent/examples/helloAgent.gram uses the same multiline format and passes gram-lint, but fails when parsed programmatically with Gram.fromGram.