Lepl Manual

There’s also a Tutorial which works through an example of a parser in considerable detail. New users may want to start there.

• Getting Started
  • First Example
  • Matchers
  • More Detail
  • Repetition
  • Single Dictionary
  • Summary and Going Further
• Matchers
  • Literal
  • Any
  • And (&)
  • Or (|)
  • Repeat ([...])
  • Lookahead
  • Drop (~)
  • Apply (>, >=, args)
  • KApply (**)
  • More
  • Implementation Details
• Operators
  • Caveats and Limitations
  • Binary Operators Between Matchers
  • Prefix And Postfix Operators On Matchers
  • Operators That Apply Functions To Results
  • Replacement
  • Spaces
• Results
  • Flat List
  • Nested Lists
    • Simple Lists
    • Extended List Support
  • Nodes
• Error Reporting
  • Introduction
  • Example
  • Operators, Functions and Classes
• Debugging
  • Logging
  • Stack Traces
  • Variable Traces
  • Deepest Matches
  • Trace Output
  • Common Errors
    • Missing Tokens
• Lexer
  • Introduction
  • Use
  • Limitations
  • Advanced Options
  • Example
  • The Lexer Process
• Line–Aware Parsing and the Offside Rule
  • Simple Line–Aware Parsing (Lines Only)
    • Continued and Extended Lines
  • Offside Parsing (Blocks of Lines)
    • Configuration
    • Example
    • Continued and Extended Lines
• Advanced Use
  • Configuration
    • Common, Packaged Actions
    • Debug Actions
    • Optimisation Actions
    • Low Level Actions
    • Argument Actions
  • Search and Backtracking
    • Restricting Search
    • Excluding Matches
  • Memoisation
• Patterns
  • Operators are Matchers
  • Use Or() With Complex Alternatives
  • > Capitalised; >> lowercase
  • Define Words Before Using DroppedSpace (or Separator)
  • Explicitly Exclude Spaces
  • Use Delayed() For Recursive Definitions
  • Imports
• Implementation
  • Trampolining
    • Overview
    • Optimisations
    • Simple Functional Matchers
    • Sequence Matchers
    • Trampoline Matchers
  • Memoisation
  • Parser Rewriting
  • Streams
• Resource Management
  • The Input Problem
  • The Output Problem
  • The Input Solution
  • The Output Solution
• Binary Data
  • Abstract Model
  • Literal Representation
  • Examples
  • Lengths
  • BitString
  • Matching
  • Binary Literals
  • Serialisation
  • Sized Integers
• Examples
  • Parsing a Python Argument List
  • Configuration and Efficiency
  • Tabular Data
  • Simpler Offside Example
  • Parsing Lines of Words
  • Low Memory Use
• Closing Remarks
  • Credits
  • Endnote