Module tcc 

Thai Character Cluster (TCC) boundary detection.

Implements the TCC rules from Theeramunkong et al. (2000). A TCC is the smallest indivisible Thai orthographic unit — roughly one leading vowel + one consonant + its upper vowels + tone mark + trailing vowel.

Pattern (simplified)

TCC = LEAD? CONSONANT UPPER* TONE? (THANTHAKAT | FOLLOW | NIKHAHIT)?
    | NON_THAI+

TCC segmentation is used as a pre-pass by the main segmenter to ensure that word boundaries always fall on TCC boundaries.

Functions

tcc_boundaries

Return the byte offsets of every TCC boundary in text.

tcc_iter

Iterate over the TCCs in text as &str slices.