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Extract rewriters into separate functions.
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# SPDX-License-Identifier: MIT | ||
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# This is the runestone where all the formatting transformations are implemented. | ||
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function trim_trailing_whitespace(ctx::Context, node::JuliaSyntax.GreenNode) | ||
JuliaSyntax.kind(node) === K"NewlineWs" || return nothing | ||
@assert !JuliaSyntax.haschildren(node) | ||
str = String(node_bytes(ctx, node)) | ||
str′ = replace(str, r"\h*(\r\n|\r|\n)" => '\n') | ||
# If the next sibling is also a NewlineWs we can trim trailing | ||
# whitespace from this node too | ||
next_kind = next_sibling_kind(ctx) | ||
if next_kind === K"NewlineWs" | ||
# str′ = replace(str′, r"(\r\n|\r|\n)\h*" => '\n') | ||
str′ = replace(str′, r"\n\h*" => '\n') | ||
end | ||
if str == str′ | ||
return nothing | ||
end | ||
# Write new bytes and reset the stream | ||
nb = write_and_reset(ctx, str′) | ||
@assert nb != JuliaSyntax.span(node) | ||
# Create new node and return it | ||
node′ = JuliaSyntax.GreenNode(JuliaSyntax.head(node), nb, ()) | ||
return node′ | ||
end | ||
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function format_hex_literals(ctx::Context, node::JuliaSyntax.GreenNode) | ||
JuliaSyntax.kind(node) === K"HexInt" || return nothing | ||
@assert JuliaSyntax.flags(node) == 0 | ||
@assert !JuliaSyntax.haschildren(node) | ||
span = JuliaSyntax.span(node) | ||
@assert span > 2 # 0x prefix + something more | ||
# Target spans(0x + maximum chars for formatted UInt8, UInt16, UInt32, UInt64, UInt128) | ||
target_spans = 2 .+ (2, 4, 8, 16, 32) | ||
if span >= 34 || span in target_spans | ||
# Do nothing: correctly formatted or a BigInt hex literal | ||
return nothing | ||
end | ||
# Insert leading zeros | ||
i = findfirst(x -> x > span, target_spans)::Int | ||
bytes = node_bytes(ctx, node) | ||
while length(bytes) < target_spans[i] | ||
insert!(bytes, 3, '0') | ||
end | ||
nb = write_and_reset(ctx, bytes) | ||
@assert nb == length(bytes) == target_spans[i] | ||
# Create new node and return it | ||
node′ = JuliaSyntax.GreenNode(JuliaSyntax.head(node), nb, ()) | ||
return node′ | ||
end | ||
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function format_oct_literals(ctx::Context, node::JuliaSyntax.GreenNode) | ||
JuliaSyntax.kind(node) === K"OctInt" || return nothing | ||
@assert JuliaSyntax.flags(node) == 0 | ||
@assert !JuliaSyntax.haschildren(node) | ||
span = JuliaSyntax.span(node) | ||
@assert span > 2 # 0o prefix + something more | ||
# Padding depends on the value of the literal... | ||
str = String(node_bytes(ctx, node)) | ||
n = tryparse(UInt128, str) | ||
if n === nothing | ||
# Do nothing: BigInt oct literal | ||
return nothing | ||
end | ||
# Compute the target span | ||
target_span_from_value = | ||
n <= typemax(UInt8) ? 5 : n <= typemax(UInt16) ? 8 : | ||
n <= typemax(UInt32) ? 13 : n <= typemax(UInt64) ? 24 : | ||
n <= typemax(UInt128) ? 45 : error("unreachable") | ||
target_spans = (5, 8, 13, 24, 45) | ||
i = findfirst(x -> x >= span, target_spans)::Int | ||
target_span_from_source = target_spans[i] | ||
target_span = max(target_span_from_value, target_span_from_source) | ||
if span == target_span | ||
# Do nothing: correctly formatted oct literal | ||
return nothing | ||
end | ||
# Insert leading zeros | ||
bytes = node_bytes(ctx, node) | ||
while length(bytes) < target_span | ||
insert!(bytes, 3, '0') | ||
end | ||
nb = write_and_reset(ctx, bytes) | ||
@assert nb == length(bytes) == target_span | ||
# Create new node and return it | ||
node′ = JuliaSyntax.GreenNode(JuliaSyntax.head(node), nb, ()) | ||
return node′ | ||
end |