diff options
Diffstat (limited to 'lib/xixanta/src/parser.rs')
| -rw-r--r-- | lib/xixanta/src/parser.rs | 28 |
1 files changed, 27 insertions, 1 deletions
diff --git a/lib/xixanta/src/parser.rs b/lib/xixanta/src/parser.rs index 7a7e3f0..e2e31dc 100644 --- a/lib/xixanta/src/parser.rs +++ b/lib/xixanta/src/parser.rs @@ -766,9 +766,12 @@ impl Parser { // Parse statements which are neither an instruction nor an assignment. This // includes stuff like control statements or macro calls. fn parse_other(&mut self, line: &str, id: PString) -> Result<(), Vec<Error>> { - // This is either a control statement (i.e. starts with '.') or a macro call. + // This is either a control statement (i.e. starts with '.'), a + // __fallthrough__, or a macro call. let node = if id.value.starts_with('.') { self.parse_control(id, line, 0)? + } else if id.value == "__fallthrough__" { + self.parse_fallthrough(line)? } else { let args = self.parse_arguments(line, 0)?; PNode { @@ -1642,6 +1645,29 @@ impl Parser { }) } + // Parse a fallthrough statement. + fn parse_fallthrough(&mut self, line: &str) -> Result<PNode, Error> { + // Skip whitespaces and fetch the identifier. + self.skip_whitespace(line); + let identifier = self.parse_identifier(line, false)?.0; + + // If there was something else other than the identifier, it's a parsing + // error. + let rest = line.get(self.offset..).unwrap_or("").trim(); + if !rest.is_empty() { + return Err(self.parser_error("too many arguments for __fallthrough__")); + } + + Ok(PNode { + node_type: NodeType::Fallthrough, + value: identifier, + left: None, + right: None, + args: None, + source: self.current_source, + }) + } + // Returns a NodeType::Literal node with whatever could be parsed // considering the given `line` which starts with the given `symbol`. The // recursivity `level` is also provided as it will call again |