DoxigAlpha
std › zig › ZonGen › Ast › tokenLocation

tokenLocation

Function parameters

Parameters

#

Index into `tokens`, or null.

Types

#
OptionalTokenIndex
Index into `tokens`, or null.
TokenOffset
A relative token index.
OptionalTokenOffset
A relative token index, or null.
full
Fully assembled AST node information.
ExtraIndex
Index into `extra_data`.

Functions in this namespace

Functions

#
parse
Result should be freed with tree.deinit() when there are
renderAlloc
`gpa` is used for allocating the resulting formatted source code.
errorOffset
Returns an extra offset for column and byte offset of errors that
legacyAsm
To be deleted after 0.15.0 is tagged

Source

Implementation

#
pub fn tokenLocation(self: Ast, start_offset: ByteOffset, token_index: TokenIndex) Location {
    var loc = Location{
        .line = 0,
        .column = 0,
        .line_start = start_offset,
        .line_end = self.source.len,
    };
    const token_start = self.tokenStart(token_index);

    // Scan to by line until we go past the token start
    while (std.mem.indexOfScalarPos(u8, self.source, loc.line_start, '\n')) |i| {
        if (i >= token_start) {
            break; // Went past
        }
        loc.line += 1;
        loc.line_start = i + 1;
    }

    const offset = loc.line_start;
    for (self.source[offset..], 0..) |c, i| {
        if (i + offset == token_start) {
            loc.line_end = i + offset;
            while (loc.line_end < self.source.len and self.source[loc.line_end] != '\n') {
                loc.line_end += 1;
            }
            return loc;
        }
        if (c == '\n') {
            loc.line += 1;
            loc.column = 0;
            loc.line_start = i + 1;
        } else {
            loc.column += 1;
        }
    }
    return loc;
}