-
Notifications
You must be signed in to change notification settings - Fork 0
Commit
This commit does not belong to any branch on this repository, and may belong to a fork outside of the repository.
compiler: Add handling of with statements, tweak other things
DCO-1.1-Signed-off-by: Ellie <[email protected]>
- Loading branch information
Showing
4 changed files
with
254 additions
and
12 deletions.
There are no files selected for viewing
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,236 @@ | ||
| # @module compiler.ast.with_stmt | ||
| # Copyright (c) 2023, ellie/@ell1e & Horse64 Team (see AUTHORS.md). | ||
| # | ||
| # Redistribution and use in source and binary forms, with or without | ||
| # modification, are permitted provided that the following conditions are met: | ||
| # | ||
| # 1. Redistributions of source code must retain the above copyright notice, | ||
| # this list of conditions and the following disclaimer. | ||
| # 2. Redistributions in binary form must reproduce the above copyright notice, | ||
| # this list of conditions and the following disclaimer in the documentation | ||
| # and/or other materials provided with the distribution. | ||
| # | ||
| # THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" | ||
| # AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE | ||
| # IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE | ||
| # ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE | ||
| # LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR | ||
| # CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF | ||
| # SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS | ||
| # INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN | ||
| # CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) | ||
| # ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE | ||
| # POSSIBILITY OF SUCH DAMAGE. | ||
| # | ||
| # Alternatively, at your option, this file is offered under the Apache 2 | ||
| # license, see accompanied LICENSE.md. | ||
|
|
||
| import math from core.horse64.org | ||
|
|
||
| import compiler.ast as ast | ||
| import compiler.ast.block as block | ||
| import compiler.ast.expr as expr | ||
| import compiler.ast.invalid_stmt as invalid_stmt | ||
| import compiler.msg as msg | ||
| import compiler.token as token | ||
|
|
||
| type WithStmt base ast.StmtNode { | ||
| } | ||
|
|
||
| func WithStmt.init { | ||
| base.init() | ||
| self.kind = ast.N_STMT_WITH | ||
| } | ||
|
|
||
| func WithStmt.as_json_obj { | ||
| var output = base.as_json_obj() | ||
| return output | ||
| } | ||
|
|
||
| func parse(tokens, pos, msgs, project_file=none, debug=no) { | ||
| var stmt = new WithStmt() | ||
| var tokens_len = tokens.len | ||
| var startpos = pos | ||
|
|
||
| if pos > tokens_len or | ||
| tokens[pos].kind != token.T_KEYWORD or | ||
| tokens[pos].str != "with" { | ||
| return later none | ||
| } | ||
|
|
||
| if debug { | ||
| print("compiler.ast.with_stmt: parse() on " + | ||
| tokens.sub(pos, math.min(pos + 10, tokens_len)).as_str() + | ||
| "... with pos=" + pos.as_str() + ", " | ||
| "tokens.len=" + tokens.len.as_str()) | ||
| } | ||
| stmt.pos = token.get_line(tokens, pos) | ||
| stmt.col = token.get_col(tokens, pos) | ||
| pos += 1 | ||
|
|
||
| # See how long our with statement expression is: | ||
| var with_expr_start = pos | ||
| var bracket_depth = 0 | ||
| while pos <= tokens_len and (bracket_depth > 0 or ( | ||
| (tokens[pos].kind != token.T_KEYWORD or | ||
| tokens[pos].str != "as") and | ||
| (tokens[pos].kind != token.T_BRACKET or | ||
| tokens[pos].str != "{" or | ||
| pos <= startpos + 1 or | ||
| token.token_has_righthand(tokens[pos])) and | ||
| not token.surely_starts_stmt_even_in_bad_code( | ||
| tokens, pos | ||
| ))) and | ||
| not token.surely_to_toplevel_even_in_bad_code( | ||
| tokens, pos | ||
| ) { | ||
| if tokens[pos].kind == token.T_BRACKET { | ||
| if {"(", "[", "{"}.has(tokens[pos].str) { | ||
| bracket_depth += 1 | ||
| } else { | ||
| assert({")", "]", "}"}.has(tokens[pos].str)) | ||
| bracket_depth -= 1 | ||
| } | ||
| } | ||
| } | ||
| if pos >= tokens_len or ( | ||
| (tokens[pos].kind != token.T_KEYWORD or | ||
| tokens[pos].str != "as") and | ||
| (tokens[pos].kind != token.T_BRACKET or | ||
| tokens[pos].str != "{")) { | ||
| msgs.add(new msg.FileMsg( | ||
| "Unexpected " + token.describe_token_at(tokens, | ||
| with_expr_start) + | ||
| ", expected valid expression for with " | ||
| "statement.", | ||
| source_file=project_file, | ||
| line=token.get_line(tokens, with_expr_start), | ||
| col=token.get_col(tokens, with_expr_start), | ||
| )) | ||
| stmt.damaged = yes | ||
| } | ||
|
|
||
| # Try to parse with statement expression: | ||
| var with_expr = expr.parse_expression( | ||
| tokens, pos, msgs, | ||
| project_file=project_file, | ||
| max_len=pos | ||
| ) later: | ||
|
|
||
| await with_expr | ||
| if with_expr == none { | ||
| if not stmt.has_damage() { | ||
| msgs.add(new msg.FileMsg( | ||
| "Unexpected " + token.describe_token_at( | ||
| tokens, with_expr_start) + | ||
| ", expected valid expression for with " | ||
| "statement.", | ||
| source_file=project_file, | ||
| line=token.get_line(tokens, with_expr_start), | ||
| col=token.get_col(tokens, with_expr_start), | ||
| )) | ||
| } | ||
| stmt.damaged = yes | ||
| with_expr = new expr.InvalidExpr(math.max(1, | ||
| pos - (startpos + 1) | ||
| )) | ||
| } | ||
|
|
||
| # Read the 'as' label: | ||
| var as_label = none | ||
| if pos > tokens_len or | ||
| tokens[pos].kind != token.T_KEYWORD or | ||
| tokens[pos].str != "as" { | ||
| if not stmt.has_damage() { | ||
| msgs.add(new msg.FileMsg( | ||
| "Unexpected " + token.describe_token_at( | ||
| tokens, pos) + | ||
| ", expected 'as' keyword for with " | ||
| "statement starting in line " + | ||
| token.get_line(tokens, startpos).as_str() + | ||
| ", column " + | ||
| token.get_col(tokens, startpos) + ".", | ||
| source_file=project_file, | ||
| line=token.get_line(tokens, pos), | ||
| col=token.get_col(tokens, pos), | ||
| )) | ||
| } | ||
| stmt.damaged = yes | ||
| } else { | ||
| pos += 1 | ||
| if pos > tokens_len or | ||
| tokens[pos].kind != token.T_IDENT { | ||
| if not stmt.has_damage() { | ||
| msgs.add(new msg.FileMsg( | ||
| "Unexpected " + token.describe_token_at( | ||
| tokens, pos) + | ||
| ", expected identifier after 'as' keyword.", | ||
| source_file=project_file, | ||
| line=token.get_line(tokens, pos), | ||
| col=token.get_col(tokens, pos), | ||
| )) | ||
| } | ||
| stmt.damaged = yes | ||
| } | ||
| as_label = tokens[pos].str | ||
| pos += 1 | ||
| } | ||
|
|
||
| # Advance to block (not needed if the code was correct): | ||
| if pos < tokens_len and | ||
| (tokens[pos].kind != token.T_BRACKET or | ||
| tokens[pos].str != "{") { | ||
| var beforeskippos = pos | ||
| var skiplen = token.get_naive_stmt_or_expr_len( | ||
| tokens, pos - 1, bracket_depth=0, for_expr=no | ||
| ) | ||
| var skipto = pos + skiplen | ||
| while pos < skipto and ( | ||
| tokens[pos].kind != token.T_BRACKET or | ||
| tokens[pos].str != "{") { | ||
| pos += 1 | ||
| } | ||
| if not stmt.has_damage() { | ||
| msgs.add(new msg.FileMsg( | ||
| "Unexpected " + token.describe_token_at(tokens, | ||
| beforeskippos) + | ||
| ", expected '{' to open code block.", | ||
| source_file=project_file, | ||
| line=token.get_line(tokens, beforeskippos), | ||
| col=token.get_col(tokens, beforeskippos), | ||
| )) | ||
| } | ||
| stmt.damaged = yes | ||
| } | ||
|
|
||
| # Put together the collected info of the with statement: | ||
| var iexp = none | ||
| if as_label == none { | ||
| iexp = new expr.InvalidExpr(1) | ||
| } else { | ||
| iesp = new expr.IdRefExpr() | ||
| iexp.label = as_label | ||
| } | ||
| stmt.subexprs.add(iexp) | ||
| stmt.subexprs.add(with_expr) | ||
|
|
||
| # Parse inner code block: | ||
| var block_result = block.parse( | ||
| tokens, pos, msgs, project_file=project_file, | ||
| debug=debug, had_damage=stmt.has_damage(), | ||
| block_purpose_name="for the with statement starting in " | ||
| "line " + token.get_line(tokens, startpos).as_str() + | ||
| ", column " + token.get_col(tokens, startpos).as_str() | ||
| ) later: | ||
|
|
||
| await block_result | ||
| if block_result.has_damage() { | ||
| stmt.damaged = yes | ||
| } | ||
| pos += block_result.token_len | ||
| stmt.subblocks.add(block_result.stmts) | ||
|
|
||
| stmt.token_len = (pos - startpos) | ||
| return later stmt | ||
| } | ||
|
|