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using Antlr4.Runtime;

using Antlr4.Runtime.Misc;

using LogicScript.Data;

using LogicScript.Interpreting;

using LogicScript.Parsing;

using LogicScript.Parsing.Structures;

using LogicScript.Parsing.Structures.Blocks;

using LogicScript.Parsing.Structures.Expressions;

using LogicScript.Parsing.Visitors;

using LogicScript.Testing;

using System;

using System.Collections.Generic;

using System.Diagnostics.CodeAnalysis;

using System.Linq;

namespace LogicScript

{

public class Script

{

public IDictionary<string, MachinePortInfo> Inputs { get; } = new Dictionary<string, MachinePortInfo>();

public IDictionary<string, MachinePortInfo> Outputs { get; } = new Dictionary<string, MachinePortInfo>();

public IDictionary<string, MachinePortInfo> Registers { get; } = new Dictionary<string, MachinePortInfo>();

public IDictionary<string, Constant> Constants { get; } = new Dictionary<string, Constant>();

public IList<TestCase> TestCases { get; } = [];

public MachineRegister[] MachineRegisters => Registers.Values.Select(r => new MachineRegister(r.BitSize, r.VectorLength)).ToArray();

internal int RegisteredInputLength => Inputs.Values.Sum(o => o.BitSize * o.VectorLength);

internal int RegisteredOutputLength => Outputs.Values.Sum(o => o.BitSize * o.VectorLength);

internal IList<Block> Blocks { get; } = [];

public string Source { get; }

public string FileName { get; }

public IReadOnlyList<Error> Errors { get; }

public bool HasErrors => Errors.Count > 0;

internal Script(string source, string fileName, IReadOnlyList<Error> errors)

{

this.Source = source;

this.FileName = fileName;

this.Errors = errors;

}

// For tests

internal Script() : this("", "", [])

{

}

public IEnumerable<ICodeNode> VisitAll(bool depthFirst = true)

{

return Blocks.Cast<ICodeNode>().Concat(TestCases.Cast<ICodeNode>()).Concat(Constants.Values.Cast<ICodeNode>()).SelectMany(o => o.GetDescendants(depthFirst));

}

public bool TryGetPort(string name, MachinePorts ports, [MaybeNullWhen(false)] out MachinePortInfo portInfo)

{

switch (ports)

{

case MachinePorts.Input:

return Inputs.TryGetValue(name, out portInfo);

case MachinePorts.Output:

return Outputs.TryGetValue(name, out portInfo);

case MachinePorts.Register:

return Registers.TryGetValue(name, out portInfo);

default:

portInfo = default;

return false;

}

}

internal ICodeNode? GetNodeAt(SourceLocation loc, Type[]? types = null, bool depthFirst = true)

{

foreach (var node in VisitAll(depthFirst))

{

var nodeType = node.GetType();

if ((types == null || types.Any(t => t.IsAssignableFrom(nodeType))) && node.Span.Contains(loc))

return node;

}

return null;

}

public static (Script? Script, IReadOnlyList<Error> Errors) Parse(string source, string fileName = "<script>", bool addNewline = true)

{

var errors = new ErrorSink();

var normSource = source.Replace("\r\n", "\n");

if (addNewline)

normSource += "\n";

var input = new AntlrInputStream(normSource)

{

name = fileName

};

var lexer = new LogicScriptLexer(input);

var stream = new CommonTokenStream(lexer);

var parser = new LogicScriptParser(stream);

parser.AddErrorListener(new ErrorListener(errors));

Script? script = null;

try

{

var scriptCtx = parser.script();

if (scriptCtx == null)

{

errors.AddError("Expected script file", new SourceSpan(), true);

}

else

{

script = new ScriptVisitor(errors, source).Visit(scriptCtx);

}

}

catch (ParseException ex)

{

errors.AddError(ex.Message, ex.Span);

}

catch (NotConstantException ex)

{

errors.AddError(ex.Message, ex.Node);

}

catch (ParseCanceledException)

{

}

return (script, errors);

}

internal (Expression? Parsed, IReadOnlyCollection<Error> Errors) ParseExpression(string expression, IReadOnlyCollection<LocalInfo> locals)

{

var errors = new ErrorSink();

var scriptContext = new ScriptContext(this, errors);

var blockContext = new BlockContext(scriptContext);

foreach (var local in locals)

{

blockContext.Locals.Add(local);

}

var input = new AntlrInputStream(expression.Replace("\r\n", "\n") + "\n")

{

name = "<expression>"

};

var lexer = new LogicScriptLexer(input);

var stream = new CommonTokenStream(lexer);

var parser = new LogicScriptParser(stream);

parser.AddErrorListener(new ErrorListener(errors));

Expression? parsed = null;

try

{

parsed = new ExpressionVisitor(blockContext).Visit(parser.expression());

}

catch (ParseException ex)

{

errors.AddError(ex.Message, ex.Span);

}

catch (NotConstantException ex)

{

errors.AddError(ex.Message, ex.Node);

}

catch (ParseCanceledException)

{

}

return (parsed, errors);

}

}

}