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const std = @import("std");
const pars = @import("parser.zig");
const Scope = struct {
par: ?*Scope,
symbs: std.StringHashMap(Symbol),
};
const Symbol = union(enum) {
Type: SymbType,
Value: SymbValue,
};
pub const SymbType = union(enum) {
Void,
Integer,
String,
};
const SymbValue = struct {
typ: SymbType,
id: u32,
mut: bool,
};
pub const SymbolTable = struct {
scope: ?*Scope = null,
allocator: std.mem.Allocator,
pub fn init(allocator: std.mem.Allocator) !*SymbolTable {
const scope = try allocator.create(Scope);
scope.par = null;
scope.symbs = std.StringHashMap(Symbol).init(allocator);
const table = try allocator.create(SymbolTable);
table.* = SymbolTable{
.scope = scope,
.allocator = allocator,
};
return table;
}
pub fn deinit(self: *SymbolTable) void {
if (self.scope) |scope| {
scope.symbs.deinit();
self.allocator.destroy(scope);
}
}
pub fn makeChild(self: *SymbolTable) SymbolTable {
const scope = try self.allocator.create(Scope);
scope.par = self;
scope.symbs = std.StringHashMap(Symbol).init(self.allocator);
return SymbolTable{
.scope = scope,
.allocator = self.allocator,
};
}
pub fn parent(self: SymbolTable) ?*SymbolTable {
if (self.scope) |scope|
if (scope.par) |par|
return par;
return null;
}
pub fn contains(self: SymbolTable, ident: []const u8) bool {
if (self.scope) |scope| return scope.symbs.contains(ident);
return false;
}
pub fn get(self: SymbolTable, ident: []const u8) ?Symbol {
if (self.scope) |scope| return scope.symbs.get(ident);
return null;
}
pub fn getValue(self: SymbolTable, ident: []const u8) ?SymbValue {
if (self.get(ident)) |symbol|
return switch (symbol) {
.Value => |value| value,
else => null,
};
return null;
}
pub fn getMut(self: *SymbolTable, ident: []const u8) ?Symbol {
if (self.get(ident)) |symbol|
return switch (symbol) {
.Value => null,
else => symbol,
};
return null;
}
pub fn insert(self: *SymbolTable, ident: []const u8, symbol: Symbol) bool {
if (self.scope) |scope| {
if (scope.symbs.getEntry(ident)) return false;
scope.symbs.put(ident, symbol);
return true;
}
return false;
}
};
const Populator = struct {
id: u32,
allocator: std.mem.Allocator,
pub fn init(allocator: std.mem.Allocator) Populator {
return .{
.id = 0,
.allocator = allocator,
};
}
fn populateSymtable(self: *Populator, node: *pars.Node) void {
switch (node) {
.Stmt => |stmt| {
const table: *SymbolTable = stmt.symtable;
switch (stmt.kind) {
.defVar => |variable| {
const symbol = self.buildValueSymb(
table,
if (variable.expr.typ) |typ| typ else .Integer,
true,
);
table.insert(variable.ident, symbol);
},
.defValue => |value| {
const symbol = self.buildValueSymb(
table,
if (value.expr.typ) |typ| typ else .Integer,
true,
);
table.insert(value.ident, symbol);
},
}
},
else => {
for (node.children(self.allocator)) |child|
populateSymtable(&child);
},
}
}
fn buildValueSymb(self: *Populator, table: *SymbolTable, typ: SymbType, mutable: bool) Symbol {
const newTyp = table.getType(typ);
}
};
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