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syntax diff
state headers header
str 'diff ' header
str 'index ' header
str 'new ' header
str -- '--- ' header
str '+++ ' header
str '@@ ' chunk
char # comment
noeat text
state header
char "\n" headers
eat this
state chunk
char "\n" diff chunk
eat this
state diff code
char ' ' context
char + added
char -- - removed
str '@@ ' chunk
noeat headers
state context
char "\n" diff
eat this
state added
char "\n" diff
eat this
state removed
char "\n" diff
eat this
state comment
char "\n" headers
eat this
state text
char "\n" headers
eat this
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