870 lines
28 KiB
Plaintext
870 lines
28 KiB
Plaintext
import "@std/mem"
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import "@std/arraylist"
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import "@source/diagnostics"
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import "@source/lexer"
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import "@source/ast"
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@hide:file
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SyntaxError :: enum { unexpected_token }
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@hide:file
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ParseError :: alias SyntaxError | mem.AllocError | diagnostics.CapacityError
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@hide:file
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BindingPowerScalar :: distinct u32
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@hide:file
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BindingPower :: struct {
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left BindingPowerScalar
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right BindingPowerScalar
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}
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@hide:file
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State :: struct {
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builder ast.Builder
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diagnostics @mut diagnostics.Store
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tokens []lexer.Token
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allocator mem.Allocator
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next_token usize
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paren_depth usize = 0
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}
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#! borrows `tokens` and `source` while parsing; the returned Tree borrows `source` until ast.deinit.
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#! `allocator` supplies returned node storage and temporary lists released before return.
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#! the caller owns the Tree and must release it with ast.deinit.
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parse proc(
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allocator mem.Allocator,
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tokens []lexer.Token,
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source []u8,
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diagnostic_store @mut diagnostics.Store,
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) ast.Tree ! (mem.AllocError | diagnostics.CapacityError) {
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state := State{
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builder = ast.init_builder(allocator, source),
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diagnostics = diagnostic_store,
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tokens = tokens,
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allocator = allocator,
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next_token = 0,
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}
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defer ast.deinit_builder(&state.builder)
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root :: try parse_package(&state)
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return ast.finish(&state.builder, root)
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}
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@hide:file
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parse_package proc(state @mut State) ast.NodeId ! (mem.AllocError | diagnostics.CapacityError) {
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declarations arraylist.ArrayList(ast.NodeId) := arraylist.init(state.allocator)
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defer arraylist.deinit(&declarations)
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skip_newlines(state)
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while !next_is(state, .eof) {
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start :: state.next_token
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declaration :: parse_decl(state) catch |err| {
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match err {
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.unexpected_token: {
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recovered :: try recover_decl(state, start)
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try arraylist.append(&declarations, recovered)
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skip_newlines(state)
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continue
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}
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else: return err
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}
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}
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try arraylist.append(&declarations, declaration)
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skip_newlines(state)
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}
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return try ast.add_package(
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&state.builder,
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ast.Span{ start = 0, end = u32(state.builder.source.len) },
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declarations.items,
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)
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}
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@hide:file
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parse_decl proc(state @mut State) ast.NodeId ! ParseError {
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if (next_is(state, .ident) and next_n_is(state, 1, .proc)) return try parse_func_decl(state)
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return try parse_statement_decl(state)
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}
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@hide:file
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parse_func_decl proc(state @mut State) ast.NodeId ! ParseError {
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name :: try consume(state, .ident)
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_ = try consume(state, .proc)
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_ = try consume(state, .open_paren)
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params arraylist.ArrayList(ast.NodeId) := arraylist.init(state.allocator)
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defer arraylist.deinit(¶ms)
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names arraylist.ArrayList(ast.Span) := arraylist.init(state.allocator)
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defer arraylist.deinit(&names)
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while !next_is(state, .close_paren) {
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arraylist.clear(&names)
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while true {
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token :: try consume(state, .ident)
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try arraylist.append(&names, token.span)
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if next_is(state, .ident) break
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_ = try consume(state, .comma)
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}
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type_id :: try parse_type(state)
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type_span :: ast.builder_span(&state.builder, type_id)
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for (names.items) |name_span| {
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param_id :: try ast.add_param(
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&state.builder,
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ast.Span{ start = name_span.start, end = type_span.end },
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name_span,
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type_id,
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)
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try arraylist.append(¶ms, param_id)
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}
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if next_is(state, .comma) _ = try consume(state, .comma)
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}
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_ = try consume(state, .close_paren)
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return_type :: try parse_type(state)
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body :: try parse_block(state)
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body_span :: ast.builder_span(&state.builder, body)
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return try ast.add_function_decl(
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&state.builder,
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ast.Span{ start = name.span.start, end = body_span.end },
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name.span,
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return_type,
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params.items,
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body,
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)
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}
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@hide:file
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parse_block proc(state @mut State) ast.NodeId ! ParseError {
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open :: try consume(state, .open_curly)
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statements arraylist.ArrayList(ast.NodeId) := arraylist.init(state.allocator)
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defer arraylist.deinit(&statements)
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skip_newlines(state)
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while !next_is(state, .close_curly) and !next_is(state, .eof) {
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start :: state.next_token
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statement :: parse_statement(state, false) catch |err| {
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match err {
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.unexpected_token: {
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recovered :: try recover_statement(state, start)
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try arraylist.append(&statements, recovered)
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skip_newlines(state)
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continue
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}
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else: return err
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}
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}
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try arraylist.append(&statements, statement)
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skip_newlines(state)
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}
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close :: try consume(state, .close_curly)
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return try ast.add_block(
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&state.builder,
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ast.Span{ start = open.span.start, end = close.span.end },
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statements.items,
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)
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}
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@hide:file
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parse_statement proc(state @mut State, allow_else bool) ast.NodeId ! ParseError {
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if (next_is(state, .ident) and next_n_is(state, 1, .equal)) {
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return try parse_assignment(state, allow_else)
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}
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if (
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next_is(state, .ident)
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and (
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next_n_is(state, 1, .ident)
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or next_n_is(state, 1, .double_colon)
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or next_n_is(state, 1, .colon_equal)
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)
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) {
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return try parse_statement_decl(state)
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}
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match current(state).kind {
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.if: return try parse_if(state)
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.while: return try parse_while(state, allow_else)
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.for: return try parse_for(state, allow_else)
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.return: return try parse_return(state, allow_else)
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.break, .continue: return try parse_loop_control(state, allow_else)
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.ident, .int, .float, .string, .true, .false, .minus, .bang, .open_paren: {
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expression :: try parse_expr(state)
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return try ast.add_expression_stmt(&state.builder, expression)
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}
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else: return .unexpected_token
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}
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}
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@hide:file
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parse_return proc(state @mut State, allow_else bool) ast.NodeId ! ParseError {
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keyword :: try consume(state, .return)
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if (
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next_is(state, .newline) or next_is(state, .close_curly) or next_is(state, .eof)
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or (allow_else and next_is(state, .else))
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) {
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return try ast.add_return_stmt(&state.builder, keyword.span, null)
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}
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value :: try parse_expr(state)
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if (
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!next_is(state, .newline) and !next_is(state, .close_curly) and !next_is(state, .eof)
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and !(allow_else and next_is(state, .else))
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) {
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return .unexpected_token
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}
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# include consumed grouping punctuation, which has no separate expression node.
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end :: state.tokens[state.next_token - 1].span.end
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return try ast.add_return_stmt(
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&state.builder,
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ast.Span{ start = keyword.span.start, end = end },
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value,
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)
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}
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@hide:file
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parse_loop_control proc(state @mut State, allow_else bool) ast.NodeId ! ParseError {
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keyword :: current(state)
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state.next_token += 1
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if (
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!next_is(state, .newline)
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and !next_is(state, .close_curly)
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and !next_is(state, .eof)
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and !(allow_else and next_is(state, .else))
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) return .unexpected_token
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if (keyword.kind == .break)
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return try ast.add_break_stmt(&state.builder, keyword.span)
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return try ast.add_continue_stmt(&state.builder, keyword.span)
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}
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@hide:file
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parse_assignment proc(state @mut State, allow_else bool) ast.NodeId ! ParseError {
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name :: try consume(state, .ident)
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target :: try ast.add_identifier(&state.builder, name.span)
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_ = try consume(state, .equal)
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value :: try parse_expr(state)
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if (
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!next_is(state, .newline)
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and !next_is(state, .close_curly)
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and !next_is(state, .eof)
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and !(allow_else and next_is(state, .else))
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) {
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return .unexpected_token
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}
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end :: state.tokens[state.next_token - 1].span.end
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return try ast.add_assignment_stmt(
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&state.builder,
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ast.Span{ start = name.span.start, end = end },
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target,
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value,
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)
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}
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@hide:file
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parse_if proc(state @mut State) ast.NodeId ! ParseError {
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keyword :: try consume(state, .if)
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condition :: try parse_guard(state)
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braced :: next_is(state, .open_curly)
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then_block :: try parse_arm(state, true)
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# only a braced arm permits its else on a later line.
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after_then :: state.next_token
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if (braced) skip_newlines(state)
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alternative ?ast.NodeId := null
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if next_is(state, .else) {
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state.next_token += 1
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alternative = try parse_arm(state, true)
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} else {
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state.next_token = after_then
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}
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end :: if (alternative) |block|
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ast.builder_span(&state.builder, block).end
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else
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ast.builder_span(&state.builder, then_block).end
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return try ast.add_if_stmt(
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&state.builder,
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ast.Span{ start = keyword.span.start, end = end },
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condition,
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then_block,
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alternative,
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)
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}
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@hide:file
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parse_while proc(state @mut State, allow_else bool) ast.NodeId ! ParseError {
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keyword :: try consume(state, .while)
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condition :: try parse_guard(state)
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body :: try parse_arm(state, allow_else)
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return try ast.add_while_stmt(
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&state.builder,
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ast.Span{ start = keyword.span.start, end = ast.builder_span(&state.builder, body).end },
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condition,
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body,
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)
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}
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@hide:file
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CaptureList :: struct {
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item ?ast.NodeId = null
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index ?ast.NodeId = null
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pointer bool = false
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indexed bool = false
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}
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@hide:file
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parse_capture_name proc(state @mut State) ?ast.NodeId ! ParseError {
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name :: try consume(state, .ident)
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capture ?ast.NodeId := null
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if (
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name.span.end != name.span.start + 1
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or state.builder.source[usize(name.span.start)] != '_'
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) capture = try ast.add_identifier(&state.builder, name.span)
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return capture
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}
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@hide:file
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parse_captures proc(state @mut State) CaptureList ! ParseError {
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_ = try consume(state, .pipe)
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captures := CaptureList{}
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if next_is(state, .at) {
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captures.pointer = true
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state.next_token += 1
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}
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captures.item = try parse_capture_name(state)
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if next_is(state, .comma) {
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captures.indexed = true
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state.next_token += 1
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captures.index = try parse_capture_name(state)
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}
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_ = try consume(state, .pipe)
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return captures
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}
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@hide:file
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parse_for proc(state @mut State, allow_else bool) ast.NodeId ! ParseError {
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keyword :: try consume(state, .for)
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skip_newlines(state)
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iterable_start :: state.next_token
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iterable := try parse_expr(state)
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grouped :: parenthesized_guard(state, iterable_start)
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skip_newlines(state)
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captures :: parse_captures(state) catch |err| {
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match err {
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.unexpected_token: {}
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else: return err
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}
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diagnostic :: try diagnostics.add(state.diagnostics, .unexpected_token, current(state).span)
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iterable = try ast.add_invalid_expr(
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&state.builder, ast.builder_span(&state.builder, iterable), diagnostic,
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)
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while (
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!next_is(state, .open_curly) and !next_is(state, .close_curly)
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and !next_is(state, .newline) and !next_is(state, .eof)
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and !next_is(state, .else)
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) state.next_token += 1
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yield CaptureList{}
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}
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after_captures :: state.next_token
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skip_newlines(state)
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if (
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!next_is(state, .open_curly) and !grouped
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and ast.builder_expr_kind(&state.builder, iterable) != .call
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and ast.builder_expr_kind(&state.builder, iterable) != .invalid
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) {
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diagnostic :: try diagnostics.add(state.diagnostics, .unexpected_token, current(state).span)
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iterable = try ast.add_invalid_expr(
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&state.builder, ast.builder_span(&state.builder, iterable), diagnostic,
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)
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}
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# a malformed capture list must not swallow the next line's sibling.
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if (
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ast.builder_expr_kind(&state.builder, iterable) == .invalid
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and !next_is(state, .open_curly)
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) state.next_token = after_captures
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body :: try parse_arm(state, allow_else)
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return try ast.add_for_stmt(
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&state.builder,
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ast.Span{ start = keyword.span.start, end = ast.builder_span(&state.builder, body).end },
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iterable, captures.item, captures.index, captures.pointer, captures.indexed, body,
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)
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}
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@hide:file
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parse_guard proc(state @mut State) ast.NodeId ! ParseError {
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condition_start :: state.next_token
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condition := parse_expr(state) catch |err| {
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match err {
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.unexpected_token: {}
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else: return err
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}
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diagnostic :: try diagnostics.add(state.diagnostics, .unexpected_token, current(state).span)
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yield try ast.add_invalid_expr(&state.builder, current(state).span, diagnostic)
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}
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if (ast.builder_expr_kind(&state.builder, condition) == .invalid) {
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# discard a malformed guard's tail, but leave its body and enclosing block intact.
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while (
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!next_is(state, .open_curly) and !next_is(state, .close_curly)
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and !next_is(state, .newline) and !next_is(state, .eof)
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and !next_is(state, .else) and !next_is(state, .return)
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and !next_is(state, .if) and !next_is(state, .while)
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and !next_is(state, .for)
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and !next_is(state, .break) and !next_is(state, .continue)
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) {
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if (next_is(state, .ident) and next_n_is(state, 1, .equal)) break
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state.next_token += 1
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}
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}
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if (
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!next_is(state, .open_curly)
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and !parenthesized_guard(state, condition_start)
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and ast.builder_expr_kind(&state.builder, condition) != .call
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and ast.builder_expr_kind(&state.builder, condition) != .invalid
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) {
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diagnostic :: try diagnostics.add(state.diagnostics, .unexpected_token, current(state).span)
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condition = try ast.add_invalid_expr(
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&state.builder,
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ast.builder_span(&state.builder, condition),
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diagnostic,
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)
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}
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return condition
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}
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@hide:file
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parenthesized_guard proc(state @State, start usize) bool {
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if (state.tokens[start].kind != .open_paren) return false
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depth usize := 0
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for start..state.next_token |index| {
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kind :: state.tokens[index].kind
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if (kind == .open_paren) depth += 1
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if (kind == .close_paren) {
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depth -= 1
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if (depth == 0) return index + 1 == state.next_token
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}
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}
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return false
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}
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@hide:file
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parse_arm proc(state @mut State, allow_else bool) ast.NodeId ! ParseError {
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if next_is(state, .open_curly) return try parse_block(state)
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start :: state.next_token
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statement :: parse_statement(state, allow_else) catch |err| {
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match err {
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.unexpected_token: {}
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else: return err
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}
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diagnostic :: try diagnostics.add(state.diagnostics, .unexpected_token, current(state).span)
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span :: synchronize_arm(state, start)
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yield try ast.add_invalid_stmt(&state.builder, span, diagnostic)
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}
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statements [1]ast.NodeId :: [statement]
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return try ast.add_block(
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&state.builder,
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ast.builder_span(&state.builder, statement),
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statements[..],
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)
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}
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@hide:file
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synchronize_arm proc(state @mut State, start usize) ast.Span {
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first :: state.tokens[start].span
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end := first.end
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depth usize := 0
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while !next_is(state, .eof) {
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if (
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depth == 0
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and (next_is(state, .newline) or next_is(state, .close_curly) or next_is(state, .else))
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) break
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if next_is(state, .open_curly) depth += 1
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if (next_is(state, .close_curly) and depth > 0) depth -= 1
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end = current(state).span.end
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state.next_token += 1
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}
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return ast.Span{ start = first.start, end = end }
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}
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@hide:file
|
|
parse_statement_decl proc(state @mut State) ast.NodeId ! ParseError {
|
|
name :: try consume(state, .ident)
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type_id ?ast.NodeId :: if next_is(state, .ident)
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try parse_type(state)
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else
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null
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assignment :: try consume_either(state, &[.double_colon, .colon_equal])
|
|
initializer :: try parse_expr(state)
|
|
end :: ast.builder_span(&state.builder, initializer).end
|
|
mutability :: if (assignment.kind == .double_colon) .constant else .variable
|
|
return try ast.add_statement_decl(
|
|
&state.builder,
|
|
ast.Span{ start = name.span.start, end = end },
|
|
name.span,
|
|
type_id,
|
|
mutability,
|
|
initializer,
|
|
)
|
|
}
|
|
|
|
@hide:file
|
|
parse_type proc(state @mut State) ast.NodeId ! ParseError {
|
|
if (!next_is(state, .ident)) return .unexpected_token
|
|
token :: current(state)
|
|
state.next_token += 1
|
|
return try ast.add_identifier(&state.builder, token.span)
|
|
}
|
|
|
|
@hide:file
|
|
parse_expr proc(state @mut State) ast.NodeId ! ParseError {
|
|
return try parse_expr_bp(state, BindingPowerScalar(0))
|
|
}
|
|
|
|
@hide:file
|
|
parse_expr_bp proc(state @mut State, min_bp BindingPowerScalar) ast.NodeId ! ParseError {
|
|
skip_operand_newlines(state)
|
|
token := current(state)
|
|
expression_start :: state.next_token
|
|
left := if (prefix_binding_power(token.kind)) |right_bp| {
|
|
state.next_token += 1
|
|
operand :: try parse_expr_bp(state, right_bp)
|
|
operand_span :: ast.builder_span(&state.builder, operand)
|
|
operator ast.UnaryOperator :: if (token.kind == .bang) .logical_not else .negate
|
|
yield try ast.add_unary(
|
|
&state.builder,
|
|
ast.Span{ start = token.span.start, end = operand_span.end },
|
|
operator,
|
|
operand,
|
|
)
|
|
} else {
|
|
yield try parse_primary(state)
|
|
}
|
|
left_grouped := parenthesized_guard(state, expression_start)
|
|
|
|
while true {
|
|
skip_continuation_newlines(state)
|
|
token = current(state)
|
|
if (token.kind == .open_paren) {
|
|
left = try parse_call(state, left)
|
|
left_grouped = false
|
|
continue
|
|
}
|
|
if (token.kind == .range or token.kind == .range_inclusive) {
|
|
if (min_bp > BindingPowerScalar(0)) break
|
|
left = try validate_range_bound(state, left, left_grouped)
|
|
state.next_token += 1
|
|
right_start :: state.next_token
|
|
right := try parse_expr_bp(state, BindingPowerScalar(1))
|
|
right = try validate_range_bound(state, right, parenthesized_guard(state, right_start))
|
|
left = try ast.add_range(
|
|
&state.builder,
|
|
ast.Span{
|
|
start = state.tokens[expression_start].span.start,
|
|
end = state.tokens[state.next_token - 1].span.end,
|
|
},
|
|
left, right, token.kind == .range_inclusive,
|
|
)
|
|
left_grouped = false
|
|
continue
|
|
}
|
|
if (infix_binding_power(token.kind)) |power| {
|
|
if (power.left < min_bp) break
|
|
state.next_token += 1
|
|
right :: try parse_expr_bp(state, power.right)
|
|
left_span :: ast.builder_span(&state.builder, left)
|
|
right_span :: ast.builder_span(&state.builder, right)
|
|
left = try ast.add_binary(
|
|
&state.builder,
|
|
ast.Span{ start = left_span.start, end = right_span.end },
|
|
binary_operator(token.kind),
|
|
left,
|
|
right,
|
|
)
|
|
left_grouped = false
|
|
continue
|
|
}
|
|
break
|
|
}
|
|
return left
|
|
}
|
|
|
|
@hide:file
|
|
validate_range_bound proc(
|
|
state @mut State, bound ast.NodeId, grouped bool,
|
|
) ast.NodeId ! (mem.AllocError | diagnostics.CapacityError) {
|
|
if (grouped) return bound
|
|
match ast.builder_expr_kind(&state.builder, bound) {
|
|
.unary, .binary, .range: {
|
|
span :: ast.builder_span(&state.builder, bound)
|
|
diagnostic :: try diagnostics.add(state.diagnostics, .unexpected_token, span)
|
|
return try ast.add_invalid_expr(&state.builder, span, diagnostic)
|
|
}
|
|
else: return bound
|
|
}
|
|
}
|
|
|
|
@hide:file
|
|
parse_call proc(state @mut State, callee ast.NodeId) ast.NodeId ! ParseError {
|
|
_ = try consume(state, .open_paren)
|
|
state.paren_depth += 1
|
|
defer state.paren_depth -= 1
|
|
skip_operand_newlines(state)
|
|
arguments arraylist.ArrayList(ast.NodeId) := arraylist.init(state.allocator)
|
|
defer arraylist.deinit(&arguments)
|
|
|
|
while (!is_call_boundary(current(state).kind)) {
|
|
argument :: try parse_expr(state)
|
|
try arraylist.append(&arguments, argument)
|
|
if (!next_is(state, .comma)) break
|
|
state.next_token += 1
|
|
skip_operand_newlines(state)
|
|
}
|
|
close :: try consume(state, .close_paren)
|
|
return try ast.add_call(
|
|
&state.builder,
|
|
ast.Span{
|
|
start = ast.builder_span(&state.builder, callee).start,
|
|
end = close.span.end,
|
|
},
|
|
callee,
|
|
arguments.items,
|
|
)
|
|
}
|
|
|
|
@hide:file
|
|
parse_primary proc(state @mut State) ast.NodeId ! ParseError {
|
|
token :: current(state)
|
|
match token.kind {
|
|
.open_paren: {
|
|
state.next_token += 1
|
|
state.paren_depth += 1
|
|
defer state.paren_depth -= 1
|
|
expression :: try parse_expr(state)
|
|
if next_is(state, .close_paren) {
|
|
state.next_token += 1
|
|
return expression
|
|
}
|
|
diagnostic :: try diagnostics.add(
|
|
state.diagnostics,
|
|
.unexpected_token,
|
|
current(state).span,
|
|
)
|
|
return try ast.add_invalid_expr(&state.builder, ast.Span{
|
|
start = token.span.start,
|
|
end = ast.builder_span(&state.builder, expression).end,
|
|
}, diagnostic)
|
|
}
|
|
.int: {
|
|
state.next_token += 1
|
|
return try ast.add_literal(&state.builder, .int, token.span)
|
|
}
|
|
.float: {
|
|
state.next_token += 1
|
|
return try ast.add_literal(&state.builder, .float, token.span)
|
|
}
|
|
.string: {
|
|
state.next_token += 1
|
|
return try ast.add_literal(&state.builder, .string, token.span)
|
|
}
|
|
.true, .false: {
|
|
state.next_token += 1
|
|
return try ast.add_literal(&state.builder, .bool, token.span)
|
|
}
|
|
.ident: {
|
|
state.next_token += 1
|
|
return try ast.add_identifier(&state.builder, token.span)
|
|
}
|
|
else: {
|
|
diagnostic :: if (token.data.diagnostic != diagnostics.no_diagnostic)
|
|
token.data.diagnostic
|
|
else
|
|
try diagnostics.add(state.diagnostics, .unexpected_token, token.span)
|
|
|
|
if !is_expression_recovery_boundary(token.kind) {
|
|
state.next_token += 1
|
|
}
|
|
|
|
return try ast.add_invalid_expr(&state.builder, token.span, diagnostic)
|
|
}
|
|
}
|
|
}
|
|
|
|
@hide:file
|
|
is_expression_boundary proc(kind lexer.TokenKind) bool {
|
|
return match kind {
|
|
.close_paren, .newline, .close_curly, .open_curly, .else, .return, .if, .while, .for, .eof: true
|
|
else: false
|
|
}
|
|
}
|
|
|
|
@hide:file
|
|
is_call_boundary proc(kind lexer.TokenKind) bool {
|
|
return (
|
|
kind == .break
|
|
or kind == .continue
|
|
or is_expression_boundary(kind)
|
|
)
|
|
}
|
|
|
|
@hide:file
|
|
is_expression_recovery_boundary proc(kind lexer.TokenKind) bool {
|
|
return (
|
|
kind == .comma
|
|
or kind == .and
|
|
or kind == .or
|
|
or kind == .pipe
|
|
or is_expression_boundary(kind)
|
|
)
|
|
}
|
|
|
|
@hide:file
|
|
skip_operand_newlines proc(state @mut State) void {
|
|
if (state.paren_depth == 0 or !next_is(state, .newline)) return
|
|
start :: state.next_token
|
|
skip_newlines(state)
|
|
kind :: current(state).kind
|
|
if (kind != .close_paren and is_expression_boundary(kind)) state.next_token = start
|
|
# a missing operand must not consume the declaration or assignment on the next line.
|
|
if (
|
|
next_is(state, .ident)
|
|
and (
|
|
next_n_is(state, 1, .double_colon)
|
|
or next_n_is(state, 1, .colon_equal)
|
|
or next_n_is(state, 1, .equal)
|
|
or next_n_is(state, 1, .ident)
|
|
or next_n_is(state, 1, .proc)
|
|
)
|
|
) state.next_token = start
|
|
}
|
|
|
|
@hide:file
|
|
skip_continuation_newlines proc(state @mut State) void {
|
|
if (state.paren_depth == 0 or !next_is(state, .newline)) return
|
|
start :: state.next_token
|
|
skip_newlines(state)
|
|
kind :: current(state).kind
|
|
if (
|
|
kind != .close_paren and kind != .comma and kind != .open_paren
|
|
and infix_binding_power(kind) == null
|
|
) state.next_token = start
|
|
}
|
|
|
|
@hide:file
|
|
recover_decl proc(
|
|
state @mut State,
|
|
start usize,
|
|
) ast.NodeId ! (mem.AllocError | diagnostics.CapacityError) {
|
|
diagnostic :: try diagnostics.add(state.diagnostics, .unexpected_token, current(state).span)
|
|
span :: synchronize(state, start, false)
|
|
return try ast.add_invalid_decl(&state.builder, span, diagnostic)
|
|
}
|
|
|
|
@hide:file
|
|
recover_statement proc(
|
|
state @mut State,
|
|
start usize,
|
|
) ast.NodeId ! (mem.AllocError | diagnostics.CapacityError) {
|
|
diagnostic :: try diagnostics.add(state.diagnostics, .unexpected_token, current(state).span)
|
|
span :: synchronize(state, start, true)
|
|
return try ast.add_invalid_stmt(&state.builder, span, diagnostic)
|
|
}
|
|
|
|
@hide:file
|
|
synchronize proc(state @mut State, start usize, stop_at_curly bool) ast.Span {
|
|
first :: state.tokens[start].span
|
|
end := first.end
|
|
depth usize := 0
|
|
while !next_is(state, .eof) {
|
|
if (depth == 0 and next_is(state, .newline)) break
|
|
if (stop_at_curly and depth == 0 and next_is(state, .close_curly)) break
|
|
if (stop_at_curly and next_is(state, .open_curly)) depth += 1
|
|
if (stop_at_curly and next_is(state, .close_curly) and depth > 0) depth -= 1
|
|
end = current(state).span.end
|
|
state.next_token += 1
|
|
}
|
|
if next_is(state, .newline) {
|
|
end = current(state).span.end
|
|
state.next_token += 1
|
|
}
|
|
return ast.Span{ start = first.start, end = end }
|
|
}
|
|
|
|
@hide:file
|
|
skip_newlines proc(state @mut State) void {
|
|
while next_is(state, .newline) state.next_token += 1
|
|
}
|
|
|
|
@hide:file
|
|
current proc(state @State) lexer.Token {
|
|
if (state.next_token >= state.tokens.len) return state.tokens[state.tokens.len - 1]
|
|
return state.tokens[state.next_token]
|
|
}
|
|
|
|
@hide:file
|
|
next_is proc(state @State, kind lexer.TokenKind) bool {
|
|
return current(state).kind == kind
|
|
}
|
|
|
|
@hide:file
|
|
next_n_is proc(state @State, count usize, kind lexer.TokenKind) bool {
|
|
index :: state.next_token + count
|
|
return index < state.tokens.len and state.tokens[index].kind == kind
|
|
}
|
|
|
|
@hide:file
|
|
consume proc(state @mut State, kind lexer.TokenKind) lexer.Token ! SyntaxError {
|
|
token :: current(state)
|
|
if (token.kind != kind) return .unexpected_token
|
|
state.next_token += 1
|
|
return token
|
|
}
|
|
|
|
@hide:file
|
|
consume_either proc(state @mut State, kinds []lexer.TokenKind) lexer.Token ! SyntaxError {
|
|
token :: current(state)
|
|
for (kinds) |kind| if token.kind == kind {
|
|
state.next_token += 1
|
|
return token
|
|
}
|
|
return .unexpected_token
|
|
}
|
|
|
|
@hide:file
|
|
prefix_binding_power proc(kind lexer.TokenKind) ?BindingPowerScalar {
|
|
return match kind {
|
|
.minus, .bang: BindingPowerScalar(50)
|
|
else: null
|
|
}
|
|
}
|
|
|
|
@hide:file
|
|
infix_binding_power proc(kind lexer.TokenKind) ?BindingPower {
|
|
return match kind {
|
|
.or: BindingPower{ left = BindingPowerScalar(2), right = BindingPowerScalar(3) }
|
|
.and: BindingPower{ left = BindingPowerScalar(4), right = BindingPowerScalar(5) }
|
|
.equal_equal, .not_equal: BindingPower{ left = BindingPowerScalar(10), right = BindingPowerScalar(11) }
|
|
.less, .less_equal, .greater, .greater_equal: BindingPower{ left = BindingPowerScalar(20), right = BindingPowerScalar(21) }
|
|
.plus, .minus: BindingPower{ left = BindingPowerScalar(30), right = BindingPowerScalar(31) }
|
|
.star, .slash: BindingPower{ left = BindingPowerScalar(40), right = BindingPowerScalar(41) }
|
|
else: null
|
|
}
|
|
}
|
|
|
|
@hide:file
|
|
binary_operator proc(kind lexer.TokenKind) ast.BinaryOperator {
|
|
return match kind {
|
|
.and: .logical_and
|
|
.or: .logical_or
|
|
.plus: .add
|
|
.minus: .subtract
|
|
.star: .multiply
|
|
.slash: .divide
|
|
.equal_equal: .equal
|
|
.not_equal: .not_equal
|
|
.less: .less
|
|
.less_equal: .less_equal
|
|
.greater: .greater
|
|
.greater_equal: .greater_equal
|
|
else: unreachable
|
|
}
|
|
}
|